1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.466 2011/11/07 20:05:56 www 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: =back
168:
169: =item * B<Apache::lonnavmaps::communication_status>:
170:
171: Whether there is discussion on the resource, email for the user, or
172: (lumped in here) perl errors in the execution of the problem. This is
173: the second column in the main nav map.
174:
175: =item * B<Apache::lonnavmaps::quick_status>:
176:
177: An icon for the status of a problem, with five possible states:
178: Correct, incorrect, open, awaiting grading (for a problem where the
179: computer's grade is suppressed, or the computer can't grade, like
180: essay problem), or none (not open yet, not a problem). The
181: third column of the standard navmap.
182:
183: =item * B<Apache::lonnavmaps::long_status>:
184:
185: A text readout of the details of the current status of the problem,
186: such as "Due in 22 hours". The fourth column of the standard navmap.
187:
188: =item * B<Apache::lonnavmaps::part_status_summary>:
189:
190: A text readout summarizing the status of the problem. If it is a
191: single part problem, will display "Correct", "Incorrect",
192: "Not yet open", "Open", "Attempted", or "Error". If there are
193: multiple parts, this will output a string that in HTML will show a
194: status of how many parts are in each status, in color coding, trying
195: to match the colors of the icons within reason.
196:
197: Note this only makes sense if you are I<not> showing parts. If
198: C<showParts> is true (see below), this column will not output
199: anything.
200:
201: =back
202:
203: If you add any others please be sure to document them here.
204:
205: An example of a column renderer that will show the ID number of a
206: resource, along with the part name if any:
207:
208: sub {
209: my ($resource, $part, $params) = @_;
210: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
211: return '<td>' . $resource->{ID} . '</td>';
212: }
213:
214: Note these functions are responsible for the TD tags, which allow them
215: to override vertical and horizontal alignment, etc.
216:
217: =head2 Parameters
218:
219: Minimally, you should be
220: able to get away with just using 'cols' (to specify the columns
221: shown), 'url' (necessary for the folders to link to the current screen
222: correctly), and possibly 'queryString' if your app calls for it. In
223: that case, maintaining the state of the folders will be done
224: automatically.
225:
226: =over 4
227:
228: =item * B<iterator>: default: constructs one from %env
229:
230: A reference to a fresh ::iterator to use from the navmaps. The
231: rendering will reflect the options passed to the iterator, so you can
232: use that to just render a certain part of the course, if you like. If
233: one is not passed, the renderer will attempt to construct one from
234: env{'form.filter'} and env{'form.condition'} information, plus the
235: 'iterator_map' parameter if any.
236:
237: =item * B<iterator_map>: default: not used
238:
239: If you are letting the renderer do the iterator handling, you can
240: instruct the renderer to render only a particular map by passing it
241: the source of the map you want to process, like
242: '/res/103/jerf/navmap.course.sequence'.
243:
244: =item * B<include_top_level_map>: default: false
245:
246: If you need to include the top level map (meaning the course) in the
247: rendered output set this to true
248:
249: =item * B<navmap>: default: constructs one from %env
250:
251: A reference to a navmap, used only if an iterator is not passed in. If
252: this is necessary to make an iterator but it is not passed in, a new
253: one will be constructed based on env info. This is useful to do basic
254: error checking before passing it off to render.
255:
256: =item * B<r>: default: must be passed in
257:
258: The standard Apache response object. This must be passed to the
259: renderer or the course hash will be locked.
260:
261: =item * B<cols>: default: empty (useless)
262:
263: An array reference
264:
265: =item * B<showParts>:default true
266:
267: A flag. If true, a line for the resource itself, and a line
268: for each part will be displayed. If not, only one line for each
269: resource will be displayed.
270:
271: =item * B<condenseParts>: default true
272:
273: A flag. If true, if all parts of the problem have the same
274: status and that status is Nothing Set, Correct, or Network Failure,
275: then only one line will be displayed for that resource anyhow. If no,
276: all parts will always be displayed. If showParts is 0, this is
277: ignored.
278:
279: =item * B<jumpCount>: default: determined from %env
280:
281: A string identifying the URL to place the anchor 'curloc' at.
282: It is the responsibility of the renderer user to
283: ensure that the #curloc is in the URL. By default, determined through
284: the use of the env{} 'jump' information, and should normally "just
285: work" correctly.
286:
287: =item * B<here>: default: empty string
288:
289: A Symb identifying where to place the 'here' marker. The empty
290: string means no marker.
291:
292: =item * B<indentString>: default: 25 pixel whitespace image
293:
294: A string identifying the indentation string to use.
295:
296: =item * B<queryString>: default: empty
297:
298: A string which will be prepended to the query string used when the
299: folders are opened or closed. You can use this to pass
300: application-specific values.
301:
302: =item * B<url>: default: none
303:
304: The url the folders will link to, which should be the current
305: page. Required if the resource info column is shown, and you
306: are allowing the user to open and close folders.
307:
308: =item * B<currentJumpIndex>: default: no jumping
309:
310: Describes the currently-open row number to cause the browser to jump
311: to, because the user just opened that folder. By default, pulled from
312: the Jump information in the env{'form.*'}.
313:
314: =item * B<printKey>: default: false
315:
316: If true, print the key that appears on the top of the standard
317: navmaps.
318:
319: =item * B<printCloseAll>: default: true
320:
321: If true, print the "Close all folders" or "open all folders"
322: links.
323:
324: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
325:
326: A function that takes the resource object as its only parameter and
327: returns a true or false value. If true, the resource is displayed. If
328: false, it is simply skipped in the display.
329:
330: =item * B<suppressEmptySequences>: default: false
331:
332: If you're using a filter function, and displaying sequences to orient
333: the user, then frequently some sequences will be empty. Setting this to
334: true will cause those sequences not to display, so as not to confuse the
335: user into thinking that if the sequence is there there should be things
336: under it; for example, see the "Show Uncompleted Homework" view on the
337: B<NAV> screen.
338:
339: =item * B<suppressNavmaps>: default: false
340:
341: If true, will not display Navigate Content resources.
342:
343: =back
344:
345: =head2 Additional Info
346:
347: In addition to the parameters you can pass to the renderer, which will
348: be passed through unchange to the column renderers, the renderer will
349: generate the following information which your renderer may find
350: useful:
351:
352: =over 4
353:
354: =item * B<counter>:
355:
356: Contains the number of rows printed. Useful after calling the render
357: function, as you can detect whether anything was printed at all.
358:
359: =item * B<isNewBranch>:
360:
361: Useful for renderers: If this resource is currently the first resource
362: of a new branch, this will be true. The Resource column (leftmost in the
363: navmaps screen) uses this to display the "new branch" icon
364:
365: =back
366:
367: =cut
368:
369:
370: =head1 SUBROUTINES
371:
372: =over
373:
374: =item update()
375:
376: =item addToFilter()
377:
378: Convenience functions: Returns a string that adds or subtracts
379: the second argument from the first hash, appropriate for the
380: query string that determines which folders to recurse on
381:
382: =item removeFromFilter()
383:
384: =item getLinkForResource()
385:
386: Convenience function: Given a stack returned from getStack on the iterator,
387: return the correct src() value.
388:
389: =item getDescription()
390:
391: Convenience function: This separates the logic of how to create
392: the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
393: etc.) into a separate function. It takes a resource object as the
394: first parameter, and the part number of the resource as the second.
395: It's basically a big switch statement on the status of the resource.
396:
397: =item dueInLessThan24Hours()
398:
399: Convenience function, so others can use it: Is the problem due in less than 24 hours, and still can be done?
400:
401: =item lastTry()
402:
403: Convenience function, so others can use it: Is there only one try remaining for the
404: part, with more than one try to begin with, not due yet and still can be done?
405:
406: =item advancedUser()
407:
408: This puts a human-readable name on the env variable.
409:
410: =item timeToHumanString()
411:
412: timeToHumanString takes a time number and converts it to a
413: human-readable representation, meant to be used in the following
414: manner:
415:
416: =over 4
417:
418: =item * print "Due $timestring"
419:
420: =item * print "Open $timestring"
421:
422: =item * print "Answer available $timestring"
423:
424: =back
425:
426: Very, very, very, VERY English-only... goodness help a localizer on
427: this func...
428:
429: =item resource()
430:
431: returns 0
432:
433: =item communication_status()
434:
435: returns 1
436:
437: =item quick_status()
438:
439: returns 2
440:
441: =item long_status()
442:
443: returns 3
444:
445: =item part_status_summary()
446:
447: returns 4
448:
449: =item render_resource()
450:
451: =item render_communication_status()
452:
453: =item render_quick_status()
454:
455: =item render_long_status()
456:
457: =item render_parts_summary_status()
458:
459: =item setDefault()
460:
461: =item cmp_title()
462:
463: =item render()
464:
465: =item add_linkitem()
466:
467: =item show_linkitems()
468:
469: =back
470:
471: =cut
472:
473: package Apache::lonnavmaps;
474:
475: use strict;
476: use GDBM_File;
477: use Apache::loncommon();
478: use Apache::lonenc();
479: use Apache::lonlocal;
480: use Apache::lonnet;
481: use Apache::lonmap;
482:
483: use POSIX qw (floor strftime);
484: use Time::HiRes qw( gettimeofday tv_interval );
485: use LONCAPA;
486: use DateTime();
487:
488: # For debugging
489:
490: use Data::Dumper;
491:
492:
493: # symbolic constants
494: sub SYMB { return 1; }
495: sub URL { return 2; }
496: sub NOTHING { return 3; }
497:
498: # Some data
499:
500: my $resObj = "Apache::lonnavmaps::resource";
501:
502: # Keep these mappings in sync with lonquickgrades, which usesthe colors
503: # instead of the icons.
504: my %statusIconMap =
505: (
506: $resObj->CLOSED => '',
507: $resObj->OPEN => 'navmap.open.gif',
508: $resObj->CORRECT => 'navmap.correct.gif',
509: $resObj->PARTIALLY_CORRECT => 'navmap.partial.gif',
510: $resObj->INCORRECT => 'navmap.wrong.gif',
511: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
512: $resObj->ERROR => ''
513: );
514:
515: my %iconAltTags = #texthash does not work here
516: ( 'navmap.correct.gif' => 'Correct',
517: 'navmap.wrong.gif' => 'Incorrect',
518: 'navmap.open.gif' => 'Is Open',
519: 'navmap.partial.gif' => 'Partially Correct',
520: 'navmap.ellipsis.gif' => 'Attempted',
521: );
522:
523: # Defines a status->color mapping, null string means don't color
524: my %colormap =
525: ( $resObj->NETWORK_FAILURE => '',
526: $resObj->CORRECT => '',
527: $resObj->EXCUSED => '#3333FF',
528: $resObj->PAST_DUE_ANSWER_LATER => '',
529: $resObj->PAST_DUE_NO_ANSWER => '',
530: $resObj->ANSWER_OPEN => '#006600',
531: $resObj->OPEN_LATER => '',
532: $resObj->TRIES_LEFT => '',
533: $resObj->INCORRECT => '',
534: $resObj->OPEN => '',
535: $resObj->NOTHING_SET => '',
536: $resObj->ATTEMPTED => '',
537: $resObj->CREDIT_ATTEMPTED => '',
538: $resObj->ANSWER_SUBMITTED => '',
539: $resObj->PARTIALLY_CORRECT => '#006600'
540: );
541: # And a special case in the nav map; what to do when the assignment
542: # is not yet done and due in less than 24 hours
543: my $hurryUpColor = "#FF0000";
544:
545: my $future_slots_checked = 0;
546: my $future_slots = 0;
547:
548: sub addToFilter {
549: my $hashIn = shift;
550: my $addition = shift;
551: my %hash = %$hashIn;
552: $hash{$addition} = 1;
553:
554: return join (",", keys(%hash));
555: }
556:
557: sub removeFromFilter {
558: my $hashIn = shift;
559: my $subtraction = shift;
560: my %hash = %$hashIn;
561:
562: delete $hash{$subtraction};
563: return join(",", keys(%hash));
564: }
565:
566: sub getLinkForResource {
567: my $stack = shift;
568: my $res;
569:
570: # Check to see if there are any pages in the stack
571: foreach $res (@$stack) {
572: if (defined($res)) {
573: my $anchor;
574: if ($res->is_page()) {
575: foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; } }
576: $anchor=&escape($anchor->shown_symb());
577: return ($res->link(),$res->shown_symb(),$anchor);
578: }
579: # in case folder was skipped over as "only sequence"
580: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
581: if ($map=~/\.page$/) {
582: my $url=&Apache::lonnet::clutter($map);
583: $anchor=&escape($res->shown_symb());
584: return ($url,$res->shown_symb(),$anchor);
585: }
586: }
587: }
588:
589: # Failing that, return the src of the last resource that is defined
590: # (when we first recurse on a map, it puts an undefined resource
591: # on the bottom because $self->{HERE} isn't defined yet, and we
592: # want the src for the map anyhow)
593: foreach my $item (@$stack) {
594: if (defined($item)) { $res = $item; }
595: }
596:
597: if ($res) {
598: return ($res->link(),$res->shown_symb());
599: }
600: return;
601: }
602:
603:
604:
605: sub getDescription {
606: my $res = shift;
607: my $part = shift;
608: my $status = $res->status($part);
609:
610: my $open = $res->opendate($part);
611: my $due = $res->duedate($part);
612: my $answer = $res->answerdate($part);
613:
614: if ($status == $res->NETWORK_FAILURE) {
615: return &mt("Having technical difficulties; please check status later");
616: }
617: if ($status == $res->NOTHING_SET) {
618: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Not currently assigned.",$res->symb(),'opendate'),$part);
619: }
620: if ($status == $res->OPEN_LATER) {
621: return &mt("Open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($open,'start')),$res->symb(),'opendate',$part);
622: }
623: if ($res->simpleStatus($part) == $res->OPEN) {
624: unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
625: my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
626: if ($slot_status == $res->UNKNOWN) {
627: return &mt('Reservation status unknown');
628: } elsif ($slot_status == $res->RESERVED) {
629: return &mt('Reserved - ends [_1]',
630: timeToHumanString($slot_time,'end'));
631: } elsif ($slot_status == $res->RESERVED_LOCATION) {
632: return &mt('Reserved - specific location(s) - ends [_1]',
633: timeToHumanString($slot_time,'end'));
634: } elsif ($slot_status == $res->RESERVED_LATER) {
635: return &mt('Reserved - next open [_1]',
636: timeToHumanString($slot_time,'start'));
637: } elsif ($slot_status == $res->RESERVABLE) {
638: return &mt('Reservable ending [_1]',
639: timeToHumanString($slot_time,'end'));
640: } elsif ($slot_status == $res->RESERVABLE_LATER) {
641: return &mt('Reservable starting [_1]',
642: timeToHumanString($slot_time,'start'));
643: } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
644: return &mt('Reserve a time/place to work');
645: } elsif ($slot_status == $res->NOTRESERVABLE) {
646: return &mt('Reservation not available');
647: } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
648: return &mt('Submission in grading queue');
649: }
650: }
651: }
652: if ($status == $res->OPEN) {
653: if ($due) {
654: if ($res->is_practice()) {
655: return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start')),$res->symb(),'duedate',$part);
656: } else {
657: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end')),$res->symb(),'duedate',$part);
658: }
659: } else {
660: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part);
661: }
662: }
663: if ($status == $res->PAST_DUE_ANSWER_LATER) {
664: return &mt("Answer open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($answer,'start')),$res->symb(),'answerdate',$part);
665: }
666: if ($status == $res->PAST_DUE_NO_ANSWER) {
667: if ($res->is_practice()) {
668: return &mt("Closed [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start')),$res->symb(),'answerdate,duedate',$part);
669: } else {
670: return &mt("Was due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end')),$res->symb(),'answerdate,duedate',$part);
671: }
672: }
673: if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
674: && $res->handgrade($part) ne 'yes') {
675: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Answer available"),$res->symb(),'answerdate,duedate',$part);
676: }
677: if ($status == $res->EXCUSED) {
678: return &mt("Excused by instructor");
679: }
680: if ($status == $res->ATTEMPTED) {
681: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
682: return &mt("Survey submission recorded");
683: } else {
684: return &mt("Answer submitted, not yet graded");
685: }
686: }
687: if ($status == $res->CREDIT_ATTEMPTED) {
688: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
689: return &mt("Credit for survey submission");
690: }
691: }
692: if ($status == $res->TRIES_LEFT) {
693: my $tries = $res->tries($part);
694: my $maxtries = $res->maxtries($part);
695: my $triesString = "";
696: if ($tries && $maxtries) {
697: $triesString = '<font size="-1"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></font>';
698: if ($maxtries > 1 && $maxtries - $tries == 1) {
699: $triesString = "<b>$triesString</b>";
700: }
701: }
702: if ($due) {
703: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end')),$res->symb(),'duedate',$part) .
704: " $triesString";
705: } else {
706: return &Apache::lonhtmlcommon::direct_parm_link(&mt("No due date"),$res->symb(),'duedate',$part)." $triesString";
707: }
708: }
709: if ($status == $res->ANSWER_SUBMITTED) {
710: return &mt('Answer submitted');
711: }
712: }
713:
714:
715: sub dueInLessThan24Hours {
716: my $res = shift;
717: my $part = shift;
718: my $status = $res->status($part);
719:
720: return ($status == $res->OPEN() ||
721: $status == $res->TRIES_LEFT()) &&
722: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
723: $res->duedate($part) > time();
724: }
725:
726:
727: sub lastTry {
728: my $res = shift;
729: my $part = shift;
730:
731: my $tries = $res->tries($part);
732: my $maxtries = $res->maxtries($part);
733: return $tries && $maxtries && $maxtries > 1 &&
734: $maxtries - $tries == 1 && $res->duedate($part) &&
735: $res->duedate($part) > time();
736: }
737:
738:
739: sub advancedUser {
740: return $env{'request.role.adv'};
741: }
742:
743: sub timeToHumanString {
744: my ($time,$type,$format) = @_;
745:
746: # zero, '0' and blank are bad times
747: if (!$time) {
748: return &mt('never');
749: }
750: unless (&Apache::lonlocal::current_language()=~/^en/) {
751: return &Apache::lonlocal::locallocaltime($time);
752: }
753: my $now = time();
754:
755: # Positive = future
756: my $delta = $time - $now;
757:
758: my $minute = 60;
759: my $hour = 60 * $minute;
760: my $day = 24 * $hour;
761: my $week = 7 * $day;
762: my $inPast = 0;
763:
764: # Logic in comments:
765: # Is it now? (extremely unlikely)
766: if ( $delta == 0 ) {
767: return "this instant";
768: }
769:
770: if ($delta < 0) {
771: $inPast = 1;
772: $delta = -$delta;
773: }
774:
775: if ( $delta > 0 ) {
776:
777: my $tense = $inPast ? " ago" : "";
778: my $prefix = $inPast ? "" : "in ";
779:
780: # Less than a minute
781: if ( $delta < $minute ) {
782: if ($delta == 1) { return "${prefix}1 second$tense"; }
783: return "$prefix$delta seconds$tense";
784: }
785:
786: # Less than an hour
787: if ( $delta < $hour ) {
788: # If so, use minutes; or minutes, seconds (if format requires)
789: my $minutes = floor($delta / 60);
790: if (($format ne '') && ($format =~ /\%(T|S)/)) {
791: my $display;
792: if ($minutes == 1) {
793: $display = "${prefix}1 minute";
794: } else {
795: $display = "$prefix$minutes minutes";
796: }
797: my $seconds = $delta % $minute;
798: if ($seconds == 0) {
799: $display .= $tense;
800: } elsif ($seconds == 1) {
801: $display .= ", 1 second$tense";
802: } else {
803: $display .= ", $seconds seconds$tense";
804: }
805: return $display;
806: }
807: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
808: return "$prefix$minutes minutes$tense";
809: }
810:
811: # Is it less than 24 hours away? If so,
812: # display hours + minutes, (and + seconds, if format specified it)
813: if ( $delta < $hour * 24) {
814: my $hours = floor($delta / $hour);
815: my $minutes = floor(($delta % $hour) / $minute);
816: my $hourString = "$hours hours";
817: my $minuteString = ", $minutes minutes";
818: if ($hours == 1) {
819: $hourString = "1 hour";
820: }
821: if ($minutes == 1) {
822: $minuteString = ", 1 minute";
823: }
824: if ($minutes == 0) {
825: $minuteString = "";
826: }
827: if (($format ne '') && ($format =~ /\%(T|S)/)) {
828: my $display = "$prefix$hourString$minuteString";
829: my $seconds = $delta-(($hours * $hour)+($minutes * $minute));
830: if ($seconds == 0) {
831: $display .= $tense;
832: } elsif ($seconds == 1) {
833: $display .= ", 1 second$tense";
834: } else {
835: $display .= ", $seconds seconds$tense";
836: }
837: return $display;
838: }
839: return "$prefix$hourString$minuteString$tense";
840: }
841:
842: # Date/time is more than 24 hours away
843:
844: my $dt = DateTime->from_epoch(epoch => $time)
845: ->set_time_zone(&Apache::lonlocal::gettimezone());
846:
847: # If there's a caller supplied format, use it, unless it only displays
848: # H:M:S or H:M.
849:
850: if (($format ne '') && ($format ne '%T') && ($format ne '%R')) {
851: my $timeStr = $dt->strftime($format);
852: return $timeStr.' ('.$dt->time_zone_short_name().')';
853: }
854:
855: # Less than 5 days away, display day of the week and
856: # HH:MM
857:
858: if ( $delta < $day * 5 ) {
859: my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
860: $timeStr =~ s/12:00 am/00:00/;
861: $timeStr =~ s/12:00 pm/noon/;
862: return ($inPast ? "last " : "this ") .
863: $timeStr;
864: }
865:
866: my $conjunction='on';
867: if ($type eq 'start') {
868: $conjunction='at';
869: } elsif ($type eq 'end') {
870: $conjunction='by';
871: }
872: # Is it this year?
873: my $dt_now = DateTime->from_epoch(epoch => $now)
874: ->set_time_zone(&Apache::lonlocal::gettimezone());
875: if ( $dt->year() == $dt_now->year()) {
876: # Return on Month Day, HH:MM meridian
877: my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
878: $timeStr =~ s/12:00 am/00:00/;
879: $timeStr =~ s/12:00 pm/noon/;
880: return $timeStr;
881: }
882:
883: # Not this year, so show the year
884: my $timeStr =
885: $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
886: $timeStr =~ s/12:00 am/00:00/;
887: $timeStr =~ s/12:00 pm/noon/;
888: return $timeStr;
889: }
890: }
891:
892:
893: sub resource { return 0; }
894: sub communication_status { return 1; }
895: sub quick_status { return 2; }
896: sub long_status { return 3; }
897: sub part_status_summary { return 4; }
898:
899: sub render_resource {
900: my ($resource, $part, $params) = @_;
901:
902: my $nonLinkedText = ''; # stuff after resource title not in link
903:
904: my $link = $params->{"resourceLink"};
905:
906: # The URL part is not escaped at this point, but the symb is...
907:
908: my $src = $resource->src();
909: my $it = $params->{"iterator"};
910: my $filter = $it->{FILTER};
911:
912: my $title = $resource->compTitle();
913:
914: my $partLabel = "";
915: my $newBranchText = "";
916: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
917: # If this is a new branch, label it so
918: if ($params->{'isNewBranch'}) {
919: $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
920: }
921:
922: # links to open and close the folder
923:
924: my $whitespace = $location.'/whitespace_21.gif';
925: my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
926: my $linkclose = "</a>";
927:
928: # Default icon: unknown page
929: my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
930:
931: if ($resource->is_problem()) {
932: if ($part eq '0' || $params->{'condensed'}) {
933: $icon = '<img class="LC_contentImage" src="'.$location.'/';
934: if ($resource->is_task()) {
935: $icon .= 'task.gif" alt="'.&mt('Task');
936: } else {
937: $icon .= 'problem.gif" alt="'.&mt('Problem');
938: }
939: $icon .='" />';
940: } else {
941: $icon = $params->{'indentString'};
942: }
943: } else {
944: $icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
945: }
946:
947: # Display the correct map icon to open or shut map
948: if ($resource->is_map()) {
949: my $mapId = $resource->map_pc();
950: my $nowOpen = !defined($filter->{$mapId});
951: if ($it->{CONDITION}) {
952: $nowOpen = !$nowOpen;
953: }
954:
955: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
956: my $title=$resource->title;
957: $title=~s/\"/\&qout;/g;
958: if (!$params->{'resource_no_folder_link'}) {
959: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
960: $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
961: ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
962: .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
963: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
964: $params->{'queryString'} . '&filter=';
965: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
966: addToFilter($filter, $mapId) :
967: removeFromFilter($filter, $mapId);
968: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
969: . $params->{'hereType'} . '&here=' .
970: &escape($params->{'here'}) .
971: '&jump=' .
972: &escape($resource->symb()) .
973: "&folderManip=1\">";
974:
975: } else {
976: # Don't allow users to manipulate folder
977: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
978: $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
979:
980: $linkopen = "";
981: $linkclose = "";
982: }
983: }
984:
985: if ($resource->randomout()) {
986: $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
987: }
988: if (!$resource->condval()) {
989: $nonLinkedText .= ' <span class="LC_info">('.&mt('conditionally hidden').')</span> ';
990: }
991: if (($resource->is_practice()) && ($resource->is_raw_problem())) {
992: $nonLinkedText .=' <font color="green"><b>'.&mt('not graded').'</b></font>';
993: }
994:
995: # We're done preparing and finally ready to start the rendering
996: my $result = '<td class="LC_middle">';
997: my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
998:
999: my $indentLevel = $params->{'indentLevel'};
1000: if ($newBranchText) { $indentLevel--; }
1001:
1002: # print indentation
1003: for (my $i = 0; $i < $indentLevel; $i++) {
1004: $result .= $params->{'indentString'};
1005: }
1006:
1007: # Decide what to display
1008: $result .= "$newBranchText$linkopen$icon$linkclose";
1009:
1010: my $curMarkerBegin = '';
1011: my $curMarkerEnd = '';
1012:
1013: # Is this the current resource?
1014: if (!$params->{'displayedHereMarker'} &&
1015: $resource->symb() eq $params->{'here'} ) {
1016: $curMarkerBegin = '<em>';
1017: $curMarkerEnd = '</em>';
1018: $params->{'displayedHereMarker'} = 1;
1019: }
1020:
1021: if ($resource->is_problem() && $part ne '0' &&
1022: !$params->{'condensed'}) {
1023: my $displaypart=$resource->part_display($part);
1024: $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1025: if ($link!~/\#/) { $link.='#'.&escape($part); }
1026: $title = "";
1027: }
1028:
1029: if ($params->{'condensed'} && $resource->countParts() > 1) {
1030: $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1031: }
1032:
1033: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1034: $result .= "$curMarkerBegin<a href=\"$link\">$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1035: } else {
1036: $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1037: }
1038:
1039: return $result;
1040: }
1041:
1042: sub render_communication_status {
1043: my ($resource, $part, $params) = @_;
1044: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1045:
1046: my $link = $params->{"resourceLink"};
1047: my $linkopen = "<a href=\"$link\">";
1048: my $linkclose = "</a>";
1049: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1050: if ($resource->hasDiscussion()) {
1051: $discussionHTML = $linkopen .
1052: '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" title="'.&mt('New Discussion').'"/>' .
1053: $linkclose;
1054: }
1055:
1056: if ($resource->getFeedback()) {
1057: my $feedback = $resource->getFeedback();
1058: foreach my $msgid (split(/\,/, $feedback)) {
1059: if ($msgid) {
1060: $feedbackHTML .= ' <a href="/adm/email?display='
1061: . &escape($msgid) . '">'
1062: . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" title="'.&mt('New E-mail').'"/></a>';
1063: }
1064: }
1065: }
1066:
1067: if ($resource->getErrors()) {
1068: my $errors = $resource->getErrors();
1069: my $errorcount = 0;
1070: foreach my $msgid (split(/,/, $errors)) {
1071: last if ($errorcount>=10); # Only output 10 bombs maximum
1072: if ($msgid) {
1073: $errorcount++;
1074: $errorHTML .= ' <a href="/adm/email?display='
1075: . &escape($msgid) . '">'
1076: . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" title="'.&mt('New Error').'"/></a>';
1077: }
1078: }
1079: }
1080:
1081: if ($params->{'multipart'} && $part != '0') {
1082: $discussionHTML = $feedbackHTML = $errorHTML = '';
1083: }
1084: return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML </td>";
1085:
1086: }
1087: sub render_quick_status {
1088: my ($resource, $part, $params) = @_;
1089: my $result = "";
1090: my $firstDisplayed = !$params->{'condensed'} &&
1091: $params->{'multipart'} && $part eq "0";
1092:
1093: my $link = $params->{"resourceLink"};
1094: my $linkopen = "<a href=\"$link\">";
1095: my $linkclose = "</a>";
1096:
1097: $result .= '<td class="LC_middle">';
1098: if ($resource->is_problem() &&
1099: !$firstDisplayed) {
1100: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1101: my $alt = $iconAltTags{$icon};
1102: if ($icon) {
1103: my $location=
1104: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1105: $result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;
1106: } else {
1107: $result .= " ";
1108: }
1109: } else { # not problem, no icon
1110: $result .= " ";
1111: }
1112: $result .= "</td>\n";
1113: return $result;
1114: }
1115: sub render_long_status {
1116: my ($resource, $part, $params) = @_;
1117: my $result = '<td class="LC_middle LC_right">';
1118: my $firstDisplayed = !$params->{'condensed'} &&
1119: $params->{'multipart'} && $part eq "0";
1120:
1121: my $color;
1122: if ($resource->is_problem() || $resource->is_practice()) {
1123: $color = $colormap{$resource->status};
1124:
1125: if (dueInLessThan24Hours($resource, $part) ||
1126: lastTry($resource, $part)) {
1127: $color = $hurryUpColor;
1128: }
1129: }
1130:
1131: if ($resource->kind() eq "res" &&
1132: $resource->is_raw_problem() &&
1133: !$firstDisplayed) {
1134: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1135: $result .= getDescription($resource, $part);
1136: if ($color) {$result .= "</b></font>"; }
1137: }
1138: if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1139: $result .= &mt('(randomly select [_1])', $resource->randompick());
1140: }
1141: if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
1142: $result .= &mt('(randomly ordered)');
1143: }
1144:
1145: # Debugging code
1146: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1147: # ' - Part: ' . $part;
1148:
1149: $result .= "</td>\n";
1150:
1151: return $result;
1152: }
1153:
1154: # Colors obtained by taking the icons, matching the colors, and
1155: # possibly reducing the Value (HSV) of the color, if it's too bright
1156: # for text, generally by one third or so.
1157: my %statusColors =
1158: (
1159: $resObj->CLOSED => '#000000',
1160: $resObj->OPEN => '#998b13',
1161: $resObj->CORRECT => '#26933f',
1162: $resObj->INCORRECT => '#c48207',
1163: $resObj->ATTEMPTED => '#a87510',
1164: $resObj->ERROR => '#000000'
1165: );
1166: my %statusStrings =
1167: (
1168: $resObj->CLOSED => 'Not yet open',
1169: $resObj->OPEN => 'Open',
1170: $resObj->CORRECT => 'Correct',
1171: $resObj->INCORRECT => 'Incorrect',
1172: $resObj->ATTEMPTED => 'Attempted',
1173: $resObj->ERROR => 'Network Error'
1174: );
1175: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1176:
1177: sub render_parts_summary_status {
1178: my ($resource, $part, $params) = @_;
1179: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1180: if ($params->{showParts}) {
1181: return '<td></td>';
1182: }
1183:
1184: my $td = "<td align='right'>\n";
1185: my $endtd = "</td>\n";
1186: my @probs;
1187:
1188: if ($resource->contains_problem) {
1189: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1190: } else {
1191: @probs=($resource);
1192: }
1193: my $return;
1194: my %overallstatus;
1195: my $totalParts;
1196: foreach my $resource (@probs) {
1197: # If there is a single part, just show the simple status
1198: if ($resource->singlepart()) {
1199: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1200: $overallstatus{$status}++;
1201: $totalParts++;
1202: next;
1203: }
1204: # Now we can be sure the $part doesn't really matter.
1205: my $statusCount = $resource->simpleStatusCount();
1206: my @counts;
1207: foreach my $status (@statuses) {
1208: # decouple display order from the simpleStatusCount order
1209: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1210: if ($statusCount->[$slot]) {
1211: $overallstatus{$status}+=$statusCount->[$slot];
1212: $totalParts+=$statusCount->[$slot];
1213: }
1214: }
1215: }
1216: $return.= $td . $totalParts . ' parts: ';
1217: foreach my $status (@statuses) {
1218: if ($overallstatus{$status}) {
1219: $return.="<font color='" . $statusColors{$status} .
1220: "'>" . $overallstatus{$status} . ' '
1221: . $statusStrings{$status} . "</font>";
1222: }
1223: }
1224: $return.= $endtd;
1225: return $return;
1226: }
1227:
1228: my @preparedColumns = (\&render_resource, \&render_communication_status,
1229: \&render_quick_status, \&render_long_status,
1230: \&render_parts_summary_status);
1231:
1232: sub setDefault {
1233: my ($val, $default) = @_;
1234: if (!defined($val)) { return $default; }
1235: return $val;
1236: }
1237:
1238: sub cmp_title {
1239: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1240: $atitle=~s/^\s*//;
1241: $btitle=~s/^\s*//;
1242: return $atitle cmp $btitle;
1243: }
1244:
1245: sub render {
1246: my $args = shift;
1247: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1248: my $result = '';
1249: # Configure the renderer.
1250: my $cols = $args->{'cols'};
1251: if (!defined($cols)) {
1252: # no columns, no nav maps.
1253: return '';
1254: }
1255: my $navmap;
1256: if (defined($args->{'navmap'})) {
1257: $navmap = $args->{'navmap'};
1258: }
1259:
1260: my $r = $args->{'r'};
1261: my $queryString = $args->{'queryString'};
1262: my $jump = $args->{'jump'};
1263: my $here = $args->{'here'};
1264: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1265: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1266: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1267: # before the current resource when using #current
1268:
1269: # If we were passed 'here' information, we are not rendering
1270: # after a folder manipulation, and we were not passed an
1271: # iterator, make sure we open the folders to show the "here"
1272: # marker
1273: my $filterHash = {};
1274: # Figure out what we're not displaying
1275: foreach my $item (split(/\,/, $env{"form.filter"})) {
1276: if ($item) {
1277: $filterHash->{$item} = "1";
1278: }
1279: }
1280:
1281: # Filter: Remember filter function and add our own filter: Refuse
1282: # to show hidden resources unless the user can see them.
1283: my $userCanSeeHidden = advancedUser();
1284: my $filterFunc = setDefault($args->{'filterFunc'},
1285: sub {return 1;});
1286: if (!$userCanSeeHidden) {
1287: # Without renaming the filterfunc, the server seems to go into
1288: # an infinite loop
1289: my $oldFilterFunc = $filterFunc;
1290: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1291: &$oldFilterFunc($res);};
1292: }
1293:
1294: my $condition = 0;
1295: if ($env{'form.condition'}) {
1296: $condition = 1;
1297: }
1298:
1299: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1300: # Step 1: Check to see if we have a navmap
1301: if (!defined($navmap)) {
1302: $navmap = Apache::lonnavmaps::navmap->new();
1303: if (!defined($navmap)) {
1304: # no longer in course
1305: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1306: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1307: }
1308: }
1309:
1310: # Step two: Locate what kind of here marker is necessary
1311: # Determine where the "here" marker is and where the screen jumps to.
1312:
1313: if ($env{'form.postsymb'} ne '') {
1314: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1315: } elsif ($env{'form.postdata'} ne '') {
1316: # couldn't find a symb, is there a URL?
1317: my $currenturl = $env{'form.postdata'};
1318: #$currenturl=~s/^http\:\/\///;
1319: #$currenturl=~s/^[^\/]+//;
1320:
1321: $here = $jump = &Apache::lonnet::symbread($currenturl);
1322: }
1323: if ($here eq '') {
1324: my $last;
1325: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1326: &GDBM_READER(),0640)) {
1327: $last=$hash{'last_known'};
1328: untie(%hash);
1329: }
1330: if ($last) { $here = $jump = $last; }
1331: }
1332:
1333: # Step three: Ensure the folders are open
1334: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1335: my $curRes;
1336: my $found = 0;
1337:
1338: # We only need to do this if we need to open the maps to show the
1339: # current position. This will change the counter so we can't count
1340: # for the jump marker with this loop.
1341: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1342: if (ref($curRes) && $curRes->symb() eq $here) {
1343: my $mapStack = $mapIterator->getStack();
1344:
1345: # Ensure the parent maps are open
1346: for my $map (@{$mapStack}) {
1347: if ($condition) {
1348: undef $filterHash->{$map->map_pc()};
1349: } else {
1350: $filterHash->{$map->map_pc()} = 1;
1351: }
1352: }
1353: $found = 1;
1354: }
1355: }
1356: }
1357:
1358: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1359: # If this is a click on a folder or something, we want to preserve the "here"
1360: # from the querystring, and get the new "jump" marker
1361: $here = $env{'form.here'};
1362: $jump = $env{'form.jump'};
1363: }
1364:
1365: my $it = $args->{'iterator'};
1366: if (!defined($it)) {
1367: # Construct a default iterator based on $env{'form.'} information
1368:
1369: # Step 1: Check to see if we have a navmap
1370: if (!defined($navmap)) {
1371: $navmap = Apache::lonnavmaps::navmap->new();
1372: if (!defined($navmap)) {
1373: # no longer in course
1374: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1375: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1376: }
1377: }
1378:
1379: # See if we're being passed a specific map
1380: if ($args->{'iterator_map'}) {
1381: my $map = $args->{'iterator_map'};
1382: $map = $navmap->getResourceByUrl($map);
1383: my $firstResource = $map->map_start();
1384: my $finishResource = $map->map_finish();
1385:
1386: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1387: } else {
1388: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1389: }
1390: }
1391:
1392: # (re-)Locate the jump point, if any
1393: # Note this does not take filtering or hidden into account... need
1394: # to be fixed?
1395: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1396: my $curRes;
1397: my $foundJump = 0;
1398: my $counter = 0;
1399:
1400: while (($curRes = $mapIterator->next()) && !$foundJump) {
1401: if (ref($curRes)) { $counter++; }
1402:
1403: if (ref($curRes) && $jump eq $curRes->symb()) {
1404:
1405: # This is why we have to use the main iterator instead of the
1406: # potentially faster DFS: The count has to be the same, so
1407: # the order has to be the same, which DFS won't give us.
1408: $args->{'currentJumpIndex'} = $counter;
1409: $foundJump = 1;
1410: }
1411: }
1412:
1413: my $showParts = setDefault($args->{'showParts'}, 1);
1414: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1415: # keeps track of when the current resource is found,
1416: # so we can back up a few and put the anchor above the
1417: # current resource
1418: my $printKey = $args->{'printKey'};
1419: my $printCloseAll = $args->{'printCloseAll'};
1420: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1421:
1422: # Print key?
1423: if ($printKey) {
1424: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1425: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1426: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1427: if ($navmap->{LAST_CHECK}) {
1428: $result .=
1429: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
1430: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1431: '</td><td align="center" valign="bottom"> '.
1432: '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
1433: '</td>';
1434: } else {
1435: $result .= '<td align="center" valign="bottom"> '.
1436: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1437: ' <img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
1438: '</td>';
1439: }
1440:
1441: $result .= '</tr></table>';
1442: }
1443:
1444: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1445: my ($link,$text);
1446: if ($condition) {
1447: $link='navmaps?condition=0&filter=&'.$queryString.
1448: '&here='.&escape($here);
1449: $text='Close all folders';
1450: } else {
1451: $link='navmaps?condition=1&filter=&'.$queryString.
1452: '&here='.&escape($here);
1453: $text='Open all folders';
1454: }
1455: if ($env{'form.register'}) {
1456: $link .= '&register='.$env{'form.register'};
1457: }
1458: if ($args->{'caller'} eq 'navmapsdisplay') {
1459: &add_linkitem($args->{'linkitems'},'changefolder',
1460: "location.href='$link'",$text);
1461: } else {
1462: $result.= '<a href="'.$link.'">'.&mt($text).'</a>';
1463: }
1464: $result .= "\n";
1465: }
1466:
1467: # Check for any unread discussions in all resources.
1468: if ($args->{'caller'} eq 'navmapsdisplay') {
1469: &add_linkitem($args->{'linkitems'},'clearbubbles',
1470: 'document.clearbubbles.submit()',
1471: 'Mark all posts read');
1472: my $time=time;
1473: $result .= (<<END);
1474: <form name="clearbubbles" method="post" action="/adm/feedback">
1475: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1476: <input type="hidden" name="navtime" value="$time" />
1477: END
1478: if ($env{'form.register'}) {
1479: $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
1480: }
1481: if ($args->{'sort'} eq 'discussion') {
1482: my $totdisc = 0;
1483: my $haveDisc = '';
1484: my @allres=$navmap->retrieveResources();
1485: foreach my $resource (@allres) {
1486: if ($resource->hasDiscussion()) {
1487: $haveDisc .= $resource->wrap_symb().':';
1488: $totdisc ++;
1489: }
1490: }
1491: if ($totdisc > 0) {
1492: $haveDisc =~ s/:$//;
1493: $result .= (<<END);
1494: <input type="hidden" name="navmaps" value="$haveDisc" />
1495: </form>
1496: END
1497: }
1498: }
1499: $result.='</form>';
1500: }
1501:
1502: if ($args->{'caller'} eq 'navmapsdisplay') {
1503: $result .= '<table><tr><td>'.
1504: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td>';
1505: $result .= '<td> </td>';
1506: $result.='<td class="LC_middle">'.&mt('Tools:').'</td>';
1507: $result.=&show_linkitems_toolbar($args->{'linkitems'});
1508: if ($args->{'sort_html'}) {
1509: $result.='<td> </td><td> </td><td> </td>'.
1510: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1511: }
1512: $result .= '</table>';
1513: } elsif ($args->{'sort_html'}) {
1514: $result.=$args->{'sort_html'};
1515: }
1516:
1517: #$result .= "<br />\n";
1518: if ($r) {
1519: $r->print($result);
1520: $r->rflush();
1521: $result = "";
1522: }
1523: # End parameter setting
1524:
1525: $result .= "<br />\n";
1526:
1527: # Data
1528: $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");
1529:
1530: my $res = "Apache::lonnavmaps::resource";
1531: my %condenseStatuses =
1532: ( $res->NETWORK_FAILURE => 1,
1533: $res->NOTHING_SET => 1,
1534: $res->CORRECT => 1 );
1535:
1536: # Shared variables
1537: $args->{'counter'} = 0; # counts the rows
1538: $args->{'indentLevel'} = 0;
1539: $args->{'isNewBranch'} = 0;
1540: $args->{'condensed'} = 0;
1541:
1542: my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1543: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1544: $args->{'displayedHereMarker'} = 0;
1545:
1546: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1547: # since structure actually doesn't matter, except what map has what resources.
1548: if ($args->{'suppressEmptySequences'}) {
1549: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1550: $it->{FIRST_RESOURCE},
1551: $it->{FINISH_RESOURCE},
1552: {}, undef, 1);
1553: my $depth = 0;
1554: $dfsit->next();
1555: my $curRes = $dfsit->next();
1556: while ($depth > -1) {
1557: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1558: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1559:
1560: if (ref($curRes)) {
1561: # Parallel pre-processing: Do sequences have non-filtered-out children?
1562: if ($curRes->is_map()) {
1563: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1564: # Sequences themselves do not count as visible children,
1565: # unless those sequences also have visible children.
1566: # This means if a sequence appears, there's a "promise"
1567: # that there's something under it if you open it, somewhere.
1568: } else {
1569: # Not a sequence: if it's filtered, ignore it, otherwise
1570: # rise up the stack and mark the sequences as having children
1571: if (&$filterFunc($curRes)) {
1572: for my $sequence (@{$dfsit->getStack()}) {
1573: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1574: }
1575: }
1576: }
1577: }
1578: } continue {
1579: $curRes = $dfsit->next();
1580: }
1581: }
1582:
1583: my $displayedJumpMarker = 0;
1584: # Set up iteration.
1585: my $now = time();
1586: my $in24Hours = $now + 24 * 60 * 60;
1587: my $rownum = 0;
1588:
1589: # export "here" marker information
1590: $args->{'here'} = $here;
1591:
1592: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1593: my @resources;
1594: my $code='';# sub { !(shift->is_map();) };
1595: if ($args->{'sort'} eq 'title') {
1596: my $oldFilterFunc = $filterFunc;
1597: my $filterFunc=
1598: sub {
1599: my ($res)=@_;
1600: if ($res->is_map()) { return 0;}
1601: return &$oldFilterFunc($res);
1602: };
1603: @resources=$navmap->retrieveResources(undef,$filterFunc);
1604: @resources= sort { &cmp_title($a,$b) } @resources;
1605: } elsif ($args->{'sort'} eq 'duedate') {
1606: my $oldFilterFunc = $filterFunc;
1607: my $filterFunc=
1608: sub {
1609: my ($res)=@_;
1610: if (!$res->is_problem()) { return 0;}
1611: return &$oldFilterFunc($res);
1612: };
1613: @resources=$navmap->retrieveResources(undef,$filterFunc);
1614: @resources= sort {
1615: if ($a->duedate ne $b->duedate) {
1616: return $a->duedate cmp $b->duedate;
1617: }
1618: my $value=&cmp_title($a,$b);
1619: return $value;
1620: } @resources;
1621: } elsif ($args->{'sort'} eq 'discussion') {
1622: my $oldFilterFunc = $filterFunc;
1623: my $filterFunc=
1624: sub {
1625: my ($res)=@_;
1626: if (!$res->hasDiscussion() &&
1627: !$res->getFeedback() &&
1628: !$res->getErrors()) { return 0;}
1629: return &$oldFilterFunc($res);
1630: };
1631: @resources=$navmap->retrieveResources(undef,$filterFunc);
1632: @resources= sort { &cmp_title($a,$b) } @resources;
1633: } else {
1634: #unknow sort mechanism or default
1635: undef($args->{'sort'});
1636: }
1637:
1638:
1639: while (1) {
1640: if ($args->{'sort'}) {
1641: $curRes = shift(@resources);
1642: } else {
1643: $curRes = $it->next($closeAllPages);
1644: }
1645: if (!$curRes) { last; }
1646:
1647: # Maintain indentation level.
1648: if ($curRes == $it->BEGIN_MAP() ||
1649: $curRes == $it->BEGIN_BRANCH() ) {
1650: $args->{'indentLevel'}++;
1651: }
1652: if ($curRes == $it->END_MAP() ||
1653: $curRes == $it->END_BRANCH() ) {
1654: $args->{'indentLevel'}--;
1655: }
1656: # Notice new branches
1657: if ($curRes == $it->BEGIN_BRANCH()) {
1658: $args->{'isNewBranch'} = 1;
1659: }
1660:
1661: # If this isn't an actual resource, continue on
1662: if (!ref($curRes)) {
1663: next;
1664: }
1665:
1666: # If this has been filtered out, continue on
1667: if (!(&$filterFunc($curRes))) {
1668: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1669: next;
1670: }
1671:
1672: # If this is an empty sequence and we're filtering them, continue on
1673: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1674: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1675: next;
1676: }
1677:
1678: # If we're suppressing navmaps and this is a navmap, continue on
1679: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1680: next;
1681: }
1682:
1683: $args->{'counter'}++;
1684:
1685: # Does it have multiple parts?
1686: $args->{'multipart'} = 0;
1687: $args->{'condensed'} = 0;
1688: my @parts;
1689:
1690: # Decide what parts to show.
1691: if ($curRes->is_problem() && $showParts) {
1692: @parts = @{$curRes->parts()};
1693: $args->{'multipart'} = $curRes->multipart();
1694:
1695: if ($condenseParts) { # do the condensation
1696: if (!$args->{'condensed'}) {
1697: # Decide whether to condense based on similarity
1698: my $status = $curRes->status($parts[0]);
1699: my $due = $curRes->duedate($parts[0]);
1700: my $open = $curRes->opendate($parts[0]);
1701: my $statusAllSame = 1;
1702: my $dueAllSame = 1;
1703: my $openAllSame = 1;
1704: for (my $i = 1; $i < scalar(@parts); $i++) {
1705: if ($curRes->status($parts[$i]) != $status){
1706: $statusAllSame = 0;
1707: }
1708: if ($curRes->duedate($parts[$i]) != $due ) {
1709: $dueAllSame = 0;
1710: }
1711: if ($curRes->opendate($parts[$i]) != $open) {
1712: $openAllSame = 0;
1713: }
1714: }
1715: # $*allSame is true if all the statuses were
1716: # the same. Now, if they are all the same and
1717: # match one of the statuses to condense, or they
1718: # are all open with the same due date, or they are
1719: # all OPEN_LATER with the same open date, display the
1720: # status of the first non-zero part (to get the 'correct'
1721: # status right, since 0 is never 'correct' or 'open').
1722: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1723: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1724: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1725: @parts = ($parts[0]);
1726: $args->{'condensed'} = 1;
1727: }
1728: }
1729: # Multipart problem with one part: always "condense" (happens
1730: # to match the desirable behavior)
1731: if ($curRes->countParts() == 1) {
1732: @parts = ($parts[0]);
1733: $args->{'condensed'} = 1;
1734: }
1735: }
1736: }
1737:
1738: # If the multipart problem was condensed, "forget" it was multipart
1739: if (scalar(@parts) == 1) {
1740: $args->{'multipart'} = 0;
1741: } else {
1742: # Add part 0 so we display it correctly.
1743: unshift @parts, '0';
1744: }
1745:
1746: {
1747: my ($src,$symb,$anchor,$stack);
1748: if ($args->{'sort'}) {
1749: my $it = $navmap->getIterator(undef, undef, undef, 1);
1750: while ( my $res=$it->next()) {
1751: if (ref($res) &&
1752: $res->symb() eq $curRes->symb()) { last; }
1753: }
1754: $stack=$it->getStack();
1755: } else {
1756: $stack=$it->getStack();
1757: }
1758: ($src,$symb,$anchor)=getLinkForResource($stack);
1759: if (defined($anchor)) { $anchor='#'.$anchor; }
1760: my $srcHasQuestion = $src =~ /\?/;
1761: $args->{"resourceLink"} = $src.
1762: ($srcHasQuestion?'&':'?') .
1763: 'symb=' . &escape($symb).$anchor;
1764: }
1765: # Now, we've decided what parts to show. Loop through them and
1766: # show them.
1767: foreach my $part (@parts) {
1768: $rownum ++;
1769:
1770: $result .= &Apache::loncommon::start_data_table_row();
1771:
1772: # Set up some data about the parts that the cols might want
1773: my $filter = $it->{FILTER};
1774:
1775: # Now, display each column.
1776: foreach my $col (@$cols) {
1777: my $colHTML = '';
1778: if (ref($col)) {
1779: $colHTML .= &$col($curRes, $part, $args);
1780: } else {
1781: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1782: }
1783:
1784: # If this is the first column and it's time to print
1785: # the anchor, do so
1786: if ($col == $cols->[0] &&
1787: $args->{'counter'} == $args->{'currentJumpIndex'} -
1788: $currentJumpDelta) {
1789: # Jam the anchor after the <td> tag;
1790: # necessary for valid HTML (which Mozilla requires)
1791: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1792: $displayedJumpMarker = 1;
1793: }
1794: $result .= $colHTML . "\n";
1795: }
1796: $result .= &Apache::loncommon::end_data_table_row();
1797: $args->{'isNewBranch'} = 0;
1798: }
1799:
1800: if ($r && $rownum % 20 == 0) {
1801: $r->print($result);
1802: $result = "";
1803: $r->rflush();
1804: }
1805: } continue {
1806: if ($r) {
1807: # If we have the connection, make sure the user is still connected
1808: my $c = $r->connection;
1809: if ($c->aborted()) {
1810: # Who cares what we do, nobody will see it anyhow.
1811: return '';
1812: }
1813: }
1814: }
1815:
1816: # Print out the part that jumps to #curloc if it exists
1817: # delay needed because the browser is processing the jump before
1818: # it finishes rendering, so it goes to the wrong place!
1819: # onload might be better, but this routine has no access to that.
1820: # On mozilla, the 0-millisecond timeout seems to prevent this;
1821: # it's quite likely this might fix other browsers, too, and
1822: # certainly won't hurt anything.
1823: if ($displayedJumpMarker) {
1824: $result .= &Apache::lonhtmlcommon::scripttag("
1825: if (location.href.indexOf('#curloc')==-1) {
1826: setTimeout(\"location += '#curloc';\", 0)
1827: }
1828: ");
1829: }
1830:
1831: $result.=&Apache::loncommon::end_data_table();
1832:
1833: if ($r) {
1834: $r->print($result);
1835: $result = "";
1836: $r->rflush();
1837: }
1838:
1839: return $result;
1840: }
1841:
1842: sub add_linkitem {
1843: my ($linkitems,$name,$cmd,$text)=@_;
1844: $$linkitems{$name}{'cmd'}=$cmd;
1845: $$linkitems{$name}{'text'}=&mt($text);
1846: }
1847:
1848: sub show_linkitems_toolbar {
1849: my ($linkitems,$condition)=@_;
1850: my @linkorder = ('firsthomework','everything','uncompleted',
1851: 'changefolder','clearbubbles');
1852: my $result .='<td align="left">'."\n".
1853: '<span class="LC_nobreak">'."\n".
1854: '<ul id="LC_toolbar">';
1855: foreach my $link (@linkorder) {
1856: my $link_id = 'LC_content_toolbar_'.$link;
1857: if (defined($linkitems->{$link})) {
1858: if ($linkitems->{$link}{'text'} ne '') {
1859: $linkitems->{$link}{'cmd'}=~s/"/'/g;
1860: if ($linkitems->{$link}{'cmd'}) {
1861: if ($link eq 'changefolder') {
1862: if ($condition) {
1863: $link_id='LC_content_toolbar_changefolder_toggled';
1864: } else {
1865: $link_id='LC_content_toolbar_changefolder';
1866: }
1867: }
1868: $result .= '<li><a href="#" '.
1869: 'onclick="'.$linkitems->{$link}{'cmd'}.'" '.
1870: 'id="'.$link_id.'" '.
1871: 'class="LC_toolbarItem" '.
1872: 'title="'.$linkitems->{$link}{'text'}.'">'.
1873: '</a></li>'."\n";
1874: }
1875: }
1876: }
1877: }
1878: $result .= '</ul>'.
1879: '</span></td>'."\n";
1880: return $result;
1881: }
1882:
1883:
1884: 1;
1885:
1886:
1887:
1888:
1889:
1890:
1891:
1892:
1893:
1894: package Apache::lonnavmaps::navmap;
1895:
1896: =pod
1897:
1898: =head1 Object: Apache::lonnavmaps::navmap
1899:
1900: =head2 Overview
1901:
1902: The navmap object's job is to provide access to the resources
1903: in the course as Apache::lonnavmaps::resource objects, and to
1904: query and manage the relationship between those resource objects.
1905:
1906: Generally, you'll use the navmap object in one of three basic ways.
1907: In order of increasing complexity and power:
1908:
1909: =over 4
1910:
1911: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1912: various ways to obtain resource objects, based on various identifiers.
1913: Use this when you want to request information about one object or
1914: a handful of resources you already know the identities of, from some
1915: other source. For more about Ids, Symbs, and MapPcs, see the
1916: Resource documentation. Note that Url should be a B<last resort>,
1917: not your first choice; it only really works when there is only one
1918: instance of the resource in the course, which only applies to
1919: maps, and even that may change in the future (see the B<getResourceByUrl>
1920: documentation for more details.)
1921:
1922: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1923: retrieves resources matching some criterion and returns them
1924: in a flat array, with no structure information. Use this when
1925: you are manipulating a series of resources, based on what map
1926: the are in, but do not care about branching, or exactly how
1927: the maps and resources are related. This is the most common case.
1928:
1929: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1930: the course's navmap in various ways without writing the traversal
1931: code yourself. See iterator documentation below. Use this when
1932: you need to know absolutely everything about the course, including
1933: branches and the precise relationship between maps and resources.
1934:
1935: =back
1936:
1937: =head2 Creation And Destruction
1938:
1939: To create a navmap object, use the following function:
1940:
1941: =over 4
1942:
1943: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1944:
1945: Creates a new navmap object. Returns the navmap object if this is
1946: successful, or B<undef> if not.
1947:
1948: =back
1949:
1950: =head2 Methods
1951:
1952: =over 4
1953:
1954: =item * B<getIterator>(first, finish, filter, condition):
1955:
1956: See iterator documentation below.
1957:
1958: =cut
1959:
1960: use strict;
1961: use GDBM_File;
1962: use Apache::lonnet;
1963: use LONCAPA;
1964:
1965: sub new {
1966: # magic invocation to create a class instance
1967: my $proto = shift;
1968: my $class = ref($proto) || $proto;
1969: my $self = {};
1970: bless($self); # So we can call change_user if neceesary
1971:
1972: $self->{USERNAME} = shift || $env{'user.name'};
1973: $self->{DOMAIN} = shift || $env{'user.domain'};
1974:
1975:
1976:
1977: # Resource cache stores navmap resources as we reference them. We generate
1978: # them on-demand so we don't pay for creating resources unless we use them.
1979: $self->{RESOURCE_CACHE} = {};
1980:
1981: # Network failure flag, if we accessed the course or user opt and
1982: # failed
1983: $self->{NETWORK_FAILURE} = 0;
1984:
1985: # We can only tie the nav hash as done below if the username/domain
1986: # match the env one. Otherwise change_user does everything we need...since we can't
1987: # assume there are course hashes for the specific requested user@domamin:
1988: #
1989:
1990: if (($self->{USERNAME} eq $env{'user.name'}) && ($self->{DOMAIN} eq $env{'user.domain'})) {
1991:
1992: # tie the nav hash
1993:
1994: my %navmaphash;
1995: my %parmhash;
1996: my $courseFn = $env{"request.course.fn"};
1997: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1998: &GDBM_READER(), 0640))) {
1999: return undef;
2000: }
2001:
2002: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2003: &GDBM_READER(), 0640)))
2004: {
2005: untie %{$self->{PARM_HASH}};
2006: return undef;
2007: }
2008:
2009: $self->{NAV_HASH} = \%navmaphash;
2010: $self->{PARM_HASH} = \%parmhash;
2011: $self->{PARM_CACHE} = {};
2012: } else {
2013: $self->change_user($self->{USERNAME}, $self->{DOMAIN});
2014: }
2015:
2016: return $self;
2017: }
2018:
2019: #
2020: # In some instances it is useful to be able to dynamically change the
2021: # username/domain associated with a navmap (e.g. to navigate for someone
2022: # else besides the current user...if sufficiently privileged.
2023: # Parameters:
2024: # user - New user.
2025: # domain- Domain the user belongs to.
2026: # Implicit inputs:
2027: #
2028: sub change_user {
2029: my $self = shift;
2030: $self->{USERNAME} = shift;
2031: $self->{DOMAIN} = shift;
2032:
2033: # If the hashes are already tied make sure to break that bond:
2034:
2035: untie %{$self->{NAV_HASH}};
2036: untie %{$self->{PARM_HASH}};
2037:
2038: # The assumption is that we have to
2039: # use lonmap here to re-read the hash and from it reconstruct
2040: # new big and parameter hashes. An implicit assumption at this time
2041: # is that the course file is probably not created locally yet
2042: # an that we will therefore just read without tying.
2043:
2044: my ($cdom, $cnum) = split(/\_/, $env{'request.course.id'});
2045:
2046: my %big_hash;
2047: &Apache::lonmap::loadmap($cnum, $cdom, $self->{USERNAME}, $self->{DOMAIN}, \%big_hash);
2048: $self->{NAV_HASH} = \%big_hash;
2049:
2050: # Now clear the parm cache and reconstruct the parm hash fromt he big_hash
2051: # param.xxxx keys.
2052:
2053: $self->{PARM_CACHE} = {};
2054:
2055: my %parm_hash = {};
2056: foreach my $key (keys %big_hash) {
2057: if ($key =~ /^param\./) {
2058: my $param_key = $key;
2059: $param_key =~ s/^param\.//;
2060: $parm_hash{$param_key} = $big_hash{$key};
2061: }
2062: }
2063:
2064: $self->{PARM_HASH} = \%parm_hash;
2065:
2066:
2067:
2068: }
2069:
2070: sub generate_course_user_opt {
2071: my $self = shift;
2072: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2073:
2074: my $uname=$self->{USERNAME};
2075: my $udom=$self->{DOMAIN};
2076:
2077: my $cid=$env{'request.course.id'};
2078: my $cdom=$env{'course.'.$cid.'.domain'};
2079: my $cnum=$env{'course.'.$cid.'.num'};
2080:
2081: # ------------------------------------------------- Get coursedata (if present)
2082: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2083: # Check for network failure
2084: if (!ref($courseopt)) {
2085: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2086: $self->{NETWORK_FAILURE} = 1;
2087: }
2088: undef($courseopt);
2089: }
2090:
2091: # --------------------------------------------------- Get userdata (if present)
2092:
2093: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2094: # Check for network failure
2095: if (!ref($useropt)) {
2096: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2097: $self->{NETWORK_FAILURE} = 1;
2098: }
2099: undef($useropt);
2100: }
2101:
2102: $self->{COURSE_OPT} = $courseopt;
2103: $self->{USER_OPT} = $useropt;
2104:
2105: $self->{COURSE_USER_OPT_GENERATED} = 1;
2106:
2107: return;
2108: }
2109:
2110: sub generate_email_discuss_status {
2111: my $self = shift;
2112: my $symb = shift;
2113: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2114:
2115: my $cid=$env{'request.course.id'};
2116: my $cdom=$env{'course.'.$cid.'.domain'};
2117: my $cnum=$env{'course.'.$cid.'.num'};
2118:
2119: my %emailstatus = &Apache::lonnet::dump('email_status',$self->{DOMAIN},$self->{USERNAME});
2120: my $logoutTime = $emailstatus{'logout'};
2121: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2122: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2123: $courseLeaveTime : $logoutTime);
2124: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2125: $cdom, $cnum);
2126: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2127: $self->{DOMAIN},$self->{USERNAME},'lastread');
2128: my %lastreadtime = ();
2129: foreach my $key (keys %lastread) {
2130: my $shortkey = $key;
2131: $shortkey =~ s/_lastread$//;
2132: $lastreadtime{$shortkey} = $lastread{$key};
2133: }
2134:
2135: my %feedback=();
2136: my %error=();
2137: my @keys = &Apache::lonnet::getkeys('nohist_email',$self->{DOMAIN},
2138: $self->{USERNAME});
2139:
2140: foreach my $msgid (@keys) {
2141: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2142: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
2143: $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
2144: &Apache::lonenc::check_decrypt(\$symb);
2145: if (($fromcid ne '') && ($fromcid ne $cid)) {
2146: next;
2147: }
2148: if (defined($symb)) {
2149: if (defined($error) && $error == 1) {
2150: $error{$symb}.=','.$msgid;
2151: } else {
2152: $feedback{$symb}.=','.$msgid;
2153: }
2154: } else {
2155: my $plain=
2156: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
2157: if ($plain=~/ \[([^\]]+)\]\:/) {
2158: my $url=$1;
2159: if ($plain=~/\:Error \[/) {
2160: $error{$url}.=','.$msgid;
2161: } else {
2162: $feedback{$url}.=','.$msgid;
2163: }
2164: }
2165: }
2166: }
2167: }
2168:
2169: #symbs of resources that have feedbacks (will be urls pre-2.3)
2170: $self->{FEEDBACK} = \%feedback;
2171: #or errors (will be urls pre 2.3)
2172: $self->{ERROR_MSG} = \%error;
2173: $self->{DISCUSSION_TIME} = \%discussiontime;
2174: $self->{EMAIL_STATUS} = \%emailstatus;
2175: $self->{LAST_READ} = \%lastreadtime;
2176:
2177: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2178: }
2179:
2180: sub get_user_data {
2181: my $self = shift;
2182: if ($self->{RETRIEVED_USER_DATA}) { return; }
2183:
2184: # Retrieve performance data on problems
2185: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2186: $self->{DOMAIN},
2187: $self->{USERNAME});
2188: $self->{STUDENT_DATA} = \%student_data;
2189:
2190: $self->{RETRIEVED_USER_DATA} = 1;
2191: }
2192:
2193: sub get_discussion_data {
2194: my $self = shift;
2195: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2196: return $self->{DISCUSSION_DATA};
2197: }
2198:
2199: $self->generate_email_discuss_status();
2200:
2201: my $cid=$env{'request.course.id'};
2202: my $cdom=$env{'course.'.$cid.'.domain'};
2203: my $cnum=$env{'course.'.$cid.'.num'};
2204: # Retrieve discussion data for resources in course
2205: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
2206:
2207:
2208: $self->{DISCUSSION_DATA} = \%discussion_data;
2209: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2210: return $self->{DISCUSSION_DATA};
2211: }
2212:
2213:
2214: # Internal function: Takes a key to look up in the nav hash and implements internal
2215: # memory caching of that key.
2216: sub navhash {
2217: my $self = shift; my $key = shift;
2218: return $self->{NAV_HASH}->{$key};
2219: }
2220:
2221: =pod
2222:
2223: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2224: false otherwise. Undefined course maps indicate an error somewhere in
2225: LON-CAPA, and you will not be able to proceed with using the navmap.
2226: See the B<NAV> screen for an example of using this.
2227:
2228: =cut
2229:
2230: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2231: sub courseMapDefined {
2232: my $self = shift;
2233: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2234:
2235: my $firstres = $self->navhash("map_start_$uri");
2236: my $lastres = $self->navhash("map_finish_$uri");
2237: return $firstres && $lastres;
2238: }
2239:
2240: sub getIterator {
2241: my $self = shift;
2242: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2243: shift, undef, shift,
2244: shift, shift);
2245: return $iterator;
2246: }
2247:
2248: # Private method: Does the given resource (as a symb string) have
2249: # current discussion? Returns 0 if chat/mail data not extracted.
2250: sub hasDiscussion {
2251: my $self = shift;
2252: my $symb = shift;
2253: $self->generate_email_discuss_status();
2254:
2255: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2256:
2257: #return defined($self->{DISCUSSION_TIME}->{$symb});
2258:
2259: # backward compatibility (bulletin boards used to be 'wrapped')
2260: my $ressymb = $self->wrap_symb($symb);
2261: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2262: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2263: } else {
2264: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2265: 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).
2266: }
2267: }
2268:
2269: sub last_post_time {
2270: my $self = shift;
2271: my $symb = shift;
2272: my $ressymb = $self->wrap_symb($symb);
2273: return $self->{DISCUSSION_TIME}->{$ressymb};
2274: }
2275:
2276: sub discussion_info {
2277: my $self = shift;
2278: my $symb = shift;
2279: my $filter = shift;
2280:
2281: $self->get_discussion_data();
2282:
2283: my $ressymb = $self->wrap_symb($symb);
2284: # keys used to store bulletinboard postings use 'unwrapped' symb.
2285: my $discsymb = &escape($self->unwrap_symb($ressymb));
2286: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2287: if (!$version) { return; }
2288:
2289: my $prevread = $self->{LAST_READ}{$ressymb};
2290:
2291: my $count = 0;
2292: my $hiddenflag = 0;
2293: my $deletedflag = 0;
2294: my ($hidden,$deleted,%info);
2295:
2296: for (my $id=$version; $id>0; $id--) {
2297: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2298: my @keys=split(/:/,$vkeys);
2299: if (grep(/^hidden$/ ,@keys)) {
2300: if (!$hiddenflag) {
2301: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2302: $hiddenflag = 1;
2303: }
2304: } elsif (grep(/^deleted$/,@keys)) {
2305: if (!$deletedflag) {
2306: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2307: $deletedflag = 1;
2308: }
2309: } else {
2310: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2311: if ($filter eq 'unread') {
2312: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2313: next;
2314: }
2315: }
2316: $count++;
2317: $info{$count}{'subject'} =
2318: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2319: $info{$count}{'id'} = $id;
2320: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2321: }
2322: }
2323: }
2324: if (wantarray) {
2325: return ($count,%info);
2326: }
2327: return $count;
2328: }
2329:
2330: sub wrap_symb {
2331: my $self = shift;
2332: my $symb = shift;
2333: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2334: unless ($symb =~ m|adm/wrapper/adm|) {
2335: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2336: }
2337: }
2338: return $symb;
2339: }
2340:
2341: sub unwrap_symb {
2342: my $self = shift;
2343: my $ressymb = shift;
2344: my $discsymb = $ressymb;
2345: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2346: $discsymb = $1.$2;
2347: }
2348: return $discsymb;
2349: }
2350:
2351: # Private method: Does the given resource (as a symb string) have
2352: # current feedback? Returns the string in the feedback hash, which
2353: # will be false if it does not exist.
2354:
2355: sub getFeedback {
2356: my $self = shift;
2357: my $symb = shift;
2358: my $source = shift;
2359:
2360: $self->generate_email_discuss_status();
2361:
2362: if (!defined($self->{FEEDBACK})) { return ""; }
2363:
2364: my $feedback;
2365: if ($self->{FEEDBACK}->{$symb}) {
2366: $feedback = $self->{FEEDBACK}->{$symb};
2367: if ($self->{FEEDBACK}->{$source}) {
2368: $feedback .= ','.$self->{FEEDBACK}->{$source};
2369: }
2370: } else {
2371: if ($self->{FEEDBACK}->{$source}) {
2372: $feedback = $self->{FEEDBACK}->{$source};
2373: }
2374: }
2375: return $feedback;
2376: }
2377:
2378: # Private method: Get the errors for that resource (by source).
2379: sub getErrors {
2380: my $self = shift;
2381: my $symb = shift;
2382: my $src = shift;
2383:
2384: $self->generate_email_discuss_status();
2385:
2386: if (!defined($self->{ERROR_MSG})) { return ""; }
2387:
2388: my $errors;
2389: if ($self->{ERROR_MSG}->{$symb}) {
2390: $errors = $self->{ERROR_MSG}->{$symb};
2391: if ($self->{ERROR_MSG}->{$src}) {
2392: $errors .= ','.$self->{ERROR_MSG}->{$src};
2393: }
2394: } else {
2395: if ($self->{ERROR_MSG}->{$src}) {
2396: $errors = $self->{ERROR_MSG}->{$src};
2397: }
2398: }
2399: return $errors;
2400: }
2401:
2402: =pod
2403:
2404: =item * B<getById>(id):
2405:
2406: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2407: object for that resource. This method, or other methods that use it
2408: (as in the resource object) is the only proper way to obtain a
2409: resource object.
2410:
2411: =item * B<getBySymb>(symb):
2412:
2413: Based on the symb of the resource, get a resource object for that
2414: resource. This is one of the proper ways to get a resource object.
2415:
2416: =item * B<getByMapPc>(map_pc):
2417:
2418: Based on the map_pc of the resource, get a resource object for
2419: the given map. This is one of the proper ways to get a resource object.
2420:
2421: =cut
2422:
2423: # The strategy here is to cache the resource objects, and only construct them
2424: # as we use them. The real point is to prevent reading any more from the tied
2425: # hash than we have to, which should hopefully alleviate speed problems.
2426:
2427: sub getById {
2428: my $self = shift;
2429: my $id = shift;
2430:
2431: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2432: {
2433: return $self->{RESOURCE_CACHE}->{$id};
2434: }
2435:
2436: # resource handles inserting itself into cache.
2437: # Not clear why the quotes are necessary, but as of this
2438: # writing it doesn't work without them.
2439: return "Apache::lonnavmaps::resource"->new($self, $id);
2440: }
2441:
2442: sub getBySymb {
2443: my $self = shift;
2444: my $symb = shift;
2445:
2446: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2447: my $map = $self->getResourceByUrl($mapUrl);
2448: my $returnvalue = undef;
2449: if (ref($map)) {
2450: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2451: }
2452: return $returnvalue;
2453: }
2454:
2455: sub getByMapPc {
2456: my $self = shift;
2457: my $map_pc = shift;
2458: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2459: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2460: return $self->getById($map_id);
2461: }
2462:
2463: =pod
2464:
2465: =item * B<firstResource>():
2466:
2467: Returns a resource object reference corresponding to the first
2468: resource in the navmap.
2469:
2470: =cut
2471:
2472: sub firstResource {
2473: my $self = shift;
2474: my $firstResource = $self->navhash('map_start_' .
2475: &Apache::lonnet::clutter($env{'request.course.uri'}));
2476: return $self->getById($firstResource);
2477: }
2478:
2479: =pod
2480:
2481: =item * B<finishResource>():
2482:
2483: Returns a resource object reference corresponding to the last resource
2484: in the navmap.
2485:
2486: =cut
2487:
2488: sub finishResource {
2489: my $self = shift;
2490: my $firstResource = $self->navhash('map_finish_' .
2491: &Apache::lonnet::clutter($env{'request.course.uri'}));
2492: return $self->getById($firstResource);
2493: }
2494:
2495: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2496: # the actual lookup; parmval caches the results.
2497: sub parmval {
2498: my $self = shift;
2499: my ($what,$symb,$recurse)=@_;
2500: my $hashkey = $what."|||".$symb;
2501: my $cache = $self->{PARM_CACHE};
2502: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2503: if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') {
2504: if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
2505: if (wantarray) {
2506: return @{$self->{PARM_CACHE}->{$hashkey}};
2507: } else {
2508: return $self->{PARM_CACHE}->{$hashkey}->[0];
2509: }
2510: }
2511: } else {
2512: return $self->{PARM_CACHE}->{$hashkey};
2513: }
2514: }
2515: my $result = $self->parmval_real($what, $symb, $recurse);
2516: $self->{PARM_CACHE}->{$hashkey} = $result;
2517: if (wantarray) {
2518: return @{$result};
2519: }
2520: return $result->[0];
2521: }
2522:
2523: sub parmval_real {
2524: my $self = shift;
2525: my ($what,$symb,$recurse) = @_;
2526:
2527: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2528: $self->generate_course_user_opt();
2529:
2530: my $cid=$env{'request.course.id'};
2531: my $csec=$env{'request.course.sec'};
2532: my $cgroup='';
2533: my @cgrps=split(/:/,$env{'request.course.groups'});
2534: if (@cgrps > 0) {
2535: @cgrps = sort(@cgrps);
2536: $cgroup = $cgrps[0];
2537: }
2538: my $uname=$self->{USERNAME};
2539: my $udom=$self->{DOMAIN};
2540:
2541: unless ($symb) { return ['']; }
2542: my $result='';
2543:
2544: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2545: $mapname = &Apache::lonnet::deversion($mapname);
2546: # ----------------------------------------------------- Cascading lookup scheme
2547: my $rwhat=$what;
2548: $what=~s/^parameter\_//;
2549: $what=~s/\_/\./;
2550:
2551: my $symbparm=$symb.'.'.$what;
2552: my $mapparm=$mapname.'___(all).'.$what;
2553: my $usercourseprefix=$cid;
2554:
2555: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2556: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2557: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2558:
2559: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2560: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2561: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2562:
2563: my $courselevel= $usercourseprefix.'.'.$what;
2564: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2565: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2566:
2567: my $useropt = $self->{USER_OPT};
2568: my $courseopt = $self->{COURSE_OPT};
2569: my $parmhash = $self->{PARM_HASH};
2570:
2571: # ---------------------------------------------------------- first, check user
2572: if ($uname and defined($useropt)) {
2573: if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
2574: if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
2575: if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
2576: }
2577:
2578: # ------------------------------------------------------- second, check course
2579: if ($cgroup ne '' and defined($courseopt)) {
2580: if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
2581: if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
2582: if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
2583: }
2584:
2585: if ($csec and defined($courseopt)) {
2586: if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
2587: if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
2588: if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
2589: }
2590:
2591: if (defined($courseopt)) {
2592: if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
2593: }
2594:
2595: # ----------------------------------------------------- third, check map parms
2596:
2597: my $thisparm=$$parmhash{$symbparm};
2598: if (defined($thisparm)) { return [$thisparm,'map']; }
2599:
2600: # ----------------------------------------------------- fourth , check default
2601:
2602: my $meta_rwhat=$rwhat;
2603: $meta_rwhat=~s/\./_/g;
2604: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2605: if (defined($default)) { return [$default,'resource']}
2606: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2607: if (defined($default)) { return [$default,'resource']}
2608: # --------------------------------------------------- fifth, check more course
2609: if (defined($courseopt)) {
2610: if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
2611: if (defined($$courseopt{$courselevel})) {
2612: my $ret = [$$courseopt{$courselevel},'course'];
2613: return $ret;
2614: }
2615: }
2616: # --------------------------------------------------- sixth , cascade up parts
2617:
2618: my ($space,@qualifier)=split(/\./,$rwhat);
2619: my $qualifier=join('.',@qualifier);
2620: unless ($space eq '0') {
2621: my @parts=split(/_/,$space);
2622: my $id=pop(@parts);
2623: my $part=join('_',@parts);
2624: if ($part eq '') { $part='0'; }
2625: my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2626: if (defined($partgeneral[0])) { return \@partgeneral; }
2627: }
2628: if ($recurse) { return []; }
2629: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2630: if (defined($pack_def)) { return [$pack_def,'resource']; }
2631: return [''];
2632: }
2633:
2634: =pod
2635:
2636: =item * B<getResourceByUrl>(url,multiple):
2637:
2638: Retrieves a resource object by URL of the resource, unless the optional
2639: multiple parameter is included in which case an array of resource
2640: objects is returned. If passed a resource object, it will simply return
2641: it, so it is safe to use this method in code like
2642: "$res = $navmap->getResourceByUrl($res)"
2643: if you're not sure if $res is already an object, or just a URL. If the
2644: resource appears multiple times in the course, only the first instance
2645: will be returned (useful for maps), unless the multiple parameter has
2646: been included, in which case all instances are returned in an array.
2647:
2648: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2649:
2650: The map is a specification of a map to retreive the resources from,
2651: either as a url or as an object. The filterFunc is a reference to a
2652: function that takes a resource object as its one argument and returns
2653: true if the resource should be included, or false if it should not
2654: be. If recursive is true, the map will be recursively examined,
2655: otherwise it will not be. If bailout is true, the function will return
2656: as soon as it finds a resource, if false it will finish. If showall is
2657: true it will not hide maps that contain nothing but one other map. By
2658: default, the map is the top-level map of the course, filterFunc is a
2659: function that always returns 1, recursive is true, bailout is false,
2660: showall is false. The resources will be returned in a list containing
2661: the resource objects for the corresponding resources, with B<no
2662: structure information> in the list; regardless of branching,
2663: recursion, etc., it will be a flat list.
2664:
2665: Thus, this is suitable for cases where you don't want the structure,
2666: just a list of all resources. It is also suitable for finding out how
2667: many resources match a given description; for this use, if all you
2668: want to know is if I<any> resources match the description, the bailout
2669: parameter will allow you to avoid potentially expensive enumeration of
2670: all matching resources.
2671:
2672: =item * B<hasResource>(map, filterFunc, recursive, showall):
2673:
2674: Convenience method for
2675:
2676: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2677:
2678: which will tell whether the map has resources matching the description
2679: in the filter function.
2680:
2681: =item * B<usedVersion>(url):
2682:
2683: Retrieves version infomation for a url. Returns the version (a number, or
2684: the string "mostrecent") for resources which have version information in
2685: the big hash.
2686:
2687: =cut
2688:
2689:
2690: sub getResourceByUrl {
2691: my $self = shift;
2692: my $resUrl = shift;
2693: my $multiple = shift;
2694:
2695: if (ref($resUrl)) { return $resUrl; }
2696:
2697: $resUrl = &Apache::lonnet::clutter($resUrl);
2698: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2699: if (!$resId) { return ''; }
2700: if ($multiple) {
2701: my @resources = ();
2702: my @resIds = split (/,/, $resId);
2703: foreach my $id (@resIds) {
2704: my $resourceId = $self->getById($id);
2705: if ($resourceId) {
2706: push(@resources,$resourceId);
2707: }
2708: }
2709: return @resources;
2710: } else {
2711: if ($resId =~ /,/) {
2712: $resId = (split (/,/, $resId))[0];
2713: }
2714: return $self->getById($resId);
2715: }
2716: }
2717:
2718: sub retrieveResources {
2719: my $self = shift;
2720: my $map = shift;
2721: my $filterFunc = shift;
2722: if (!defined ($filterFunc)) {
2723: $filterFunc = sub {return 1;};
2724: }
2725: my $recursive = shift;
2726: if (!defined($recursive)) { $recursive = 1; }
2727: my $bailout = shift;
2728: if (!defined($bailout)) { $bailout = 0; }
2729: my $showall = shift;
2730: # Create the necessary iterator.
2731: if (!ref($map)) { # assume it's a url of a map.
2732: $map = $self->getResourceByUrl($map);
2733: }
2734:
2735: # If nothing was passed, assume top-level map
2736: if (!$map) {
2737: $map = $self->getById('0.0');
2738: }
2739:
2740: # Check the map's validity.
2741: if (!$map->is_map()) {
2742: # Oh, to throw an exception.... how I'd love that!
2743: return ();
2744: }
2745:
2746: # Get an iterator.
2747: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2748: undef, $recursive, $showall);
2749:
2750: my @resources = ();
2751:
2752: if (&$filterFunc($map)) {
2753: push(@resources, $map);
2754: }
2755:
2756: # Run down the iterator and collect the resources.
2757: my $curRes;
2758:
2759: while ($curRes = $it->next()) {
2760: if (ref($curRes)) {
2761: if (!&$filterFunc($curRes)) {
2762: next;
2763: }
2764:
2765: push(@resources, $curRes);
2766:
2767: if ($bailout) {
2768: return @resources;
2769: }
2770: }
2771:
2772: }
2773:
2774: return @resources;
2775: }
2776:
2777: sub hasResource {
2778: my $self = shift;
2779: my $map = shift;
2780: my $filterFunc = shift;
2781: my $recursive = shift;
2782: my $showall = shift;
2783:
2784: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2785: }
2786:
2787: sub usedVersion {
2788: my $self = shift;
2789: my $linkurl = shift;
2790: return $self->navhash("version_$linkurl");
2791: }
2792:
2793: 1;
2794:
2795: package Apache::lonnavmaps::iterator;
2796: use Scalar::Util qw(weaken);
2797: use Apache::lonnet;
2798:
2799: =pod
2800:
2801: =back
2802:
2803: =head1 Object: navmap Iterator
2804:
2805: An I<iterator> encapsulates the logic required to traverse a data
2806: structure. navmap uses an iterator to traverse the course map
2807: according to the criteria you wish to use.
2808:
2809: To obtain an iterator, call the B<getIterator>() function of a
2810: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2811: directly.) This will return a reference to the iterator:
2812:
2813: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2814:
2815: To get the next thing from the iterator, call B<next>:
2816:
2817: C<my $nextThing = $resourceIterator-E<gt>next()>
2818:
2819: getIterator behaves as follows:
2820:
2821: =over 4
2822:
2823: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2824:
2825: All parameters are optional. firstResource is a resource reference
2826: corresponding to where the iterator should start. It defaults to
2827: navmap->firstResource() for the corresponding nav map. finishResource
2828: corresponds to where you want the iterator to end, defaulting to
2829: navmap->finishResource(). filterHash is a hash used as a set
2830: containing strings representing the resource IDs, defaulting to
2831: empty. Condition is a 1 or 0 that sets what to do with the filter
2832: hash: If a 0, then only resources that exist IN the filterHash will be
2833: recursed on. If it is a 1, only resources NOT in the filterHash will
2834: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2835: false (default), the iterator will only return the first level of map
2836: that is not just a single, 'redirecting' map. If true, the iterator
2837: will return all information, starting with the top-level map,
2838: regardless of content. returnTopMap, if true (default false), will
2839: cause the iterator to return the top-level map object (resource 0.0)
2840: before anything else.
2841:
2842: Thus, by default, only top-level resources will be shown. Change the
2843: condition to a 1 without changing the hash, and all resources will be
2844: shown. Changing the condition to 1 and including some values in the
2845: hash will allow you to selectively suppress parts of the navmap, while
2846: leaving it on 0 and adding things to the hash will allow you to
2847: selectively add parts of the nav map. See the handler code for
2848: examples.
2849:
2850: The iterator will return either a reference to a resource object, or a
2851: token representing something in the map, such as the beginning of a
2852: new branch. The possible tokens are:
2853:
2854: =over 4
2855:
2856: =item * B<END_ITERATOR>:
2857:
2858: The iterator has returned all that it's going to. Further calls to the
2859: iterator will just produce more of these. This is a "false" value, and
2860: is the only false value the iterator which will be returned, so it can
2861: be used as a loop sentinel.
2862:
2863: =item * B<BEGIN_MAP>:
2864:
2865: A new map is being recursed into. This is returned I<after> the map
2866: resource itself is returned.
2867:
2868: =item * B<END_MAP>:
2869:
2870: The map is now done.
2871:
2872: =item * B<BEGIN_BRANCH>:
2873:
2874: A branch is now starting. The next resource returned will be the first
2875: in that branch.
2876:
2877: =item * B<END_BRANCH>:
2878:
2879: The branch is now done.
2880:
2881: =back
2882:
2883: The tokens are retreivable via methods on the iterator object, i.e.,
2884: $iterator->END_MAP.
2885:
2886: Maps can contain empty resources. The iterator will automatically skip
2887: over such resources, but will still treat the structure
2888: correctly. Thus, a complicated map with several branches, but
2889: consisting entirely of empty resources except for one beginning or
2890: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2891: but only one resource will be returned.
2892:
2893: =back
2894:
2895: =head2 Normal Usage
2896:
2897: Normal usage of the iterator object is to do the following:
2898:
2899: my $it = $navmap->getIterator([your params here]);
2900: my $curRes;
2901: while ($curRes = $it->next()) {
2902: [your logic here]
2903: }
2904:
2905: Note that inside of the loop, it's frequently useful to check if
2906: "$curRes" is a reference or not with the reference function; only
2907: resource objects will be references, and any non-references will
2908: be the tokens described above.
2909:
2910: Also note there is some old code floating around that trys to track
2911: the depth of the iterator to see when it's done; do not copy that
2912: code. It is difficult to get right and harder to understand than
2913: this. They should be migrated to this new style.
2914:
2915: =cut
2916:
2917: # Here are the tokens for the iterator:
2918:
2919: sub END_ITERATOR { return 0; }
2920: sub BEGIN_MAP { return 1; } # begining of a new map
2921: sub END_MAP { return 2; } # end of the map
2922: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2923: sub END_BRANCH { return 4; } # end of a branch
2924: sub FORWARD { return 1; } # go forward
2925: sub BACKWARD { return 2; }
2926:
2927: sub min {
2928: (my $a, my $b) = @_;
2929: if ($a < $b) { return $a; } else { return $b; }
2930: }
2931:
2932: sub new {
2933: # magic invocation to create a class instance
2934: my $proto = shift;
2935: my $class = ref($proto) || $proto;
2936: my $self = {};
2937:
2938: weaken($self->{NAV_MAP} = shift);
2939: return undef unless ($self->{NAV_MAP});
2940:
2941: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
2942: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
2943:
2944: # Handle the parameters
2945: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2946: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2947:
2948: # If the given resources are just the ID of the resource, get the
2949: # objects
2950: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2951: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2952: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2953: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2954:
2955: $self->{FILTER} = shift;
2956:
2957: # A hash, used as a set, of resource already seen
2958: $self->{ALREADY_SEEN} = shift;
2959: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2960: $self->{CONDITION} = shift;
2961:
2962: # Do we want to automatically follow "redirection" maps?
2963: $self->{FORCE_TOP} = shift;
2964:
2965: # Do we want to return the top-level map object (resource 0.0)?
2966: $self->{RETURN_0} = shift;
2967: # have we done that yet?
2968: $self->{HAVE_RETURNED_0} = 0;
2969:
2970: # Now, we need to pre-process the map, by walking forward and backward
2971: # over the parts of the map we're going to look at.
2972:
2973: # The processing steps are exactly the same, except for a few small
2974: # changes, so I bundle those up in the following list of two elements:
2975: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2976: # first_resource).
2977: # This prevents writing nearly-identical code twice.
2978: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2979: 'FIRST_RESOURCE'],
2980: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2981: 'FINISH_RESOURCE'] );
2982:
2983: my $maxDepth = 0; # tracks max depth
2984:
2985: # If there is only one resource in this map, and it's a map, we
2986: # want to remember that, so the user can ask for the first map
2987: # that isn't just a redirector.
2988: my $resource; my $resourceCount = 0;
2989:
2990: # Documentation on this algorithm can be found in the CVS repository at
2991: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2992: # in that file.
2993: # **1**
2994:
2995: foreach my $pass (@iterations) {
2996: my $direction = $pass->[0];
2997: my $valName = $pass->[1];
2998: my $nextResourceMethod = $pass->[2];
2999: my $firstResourceName = $pass->[3];
3000:
3001: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
3002: $self->{FIRST_RESOURCE},
3003: $self->{FINISH_RESOURCE},
3004: {}, undef, 0, $direction);
3005:
3006: # prime the recursion
3007: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
3008: $iterator->next();
3009: my $curRes = $iterator->next();
3010: my $depth = 1;
3011: while ($depth > 0) {
3012: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
3013: if ($curRes == $iterator->END_MAP()) { $depth--; }
3014:
3015: if (ref($curRes)) {
3016: # If there's only one resource, this will save it
3017: # we have to filter empty resources from consideration here,
3018: # or even "empty", redirecting maps have two (start & finish)
3019: # or three (start, finish, plus redirector)
3020: if($direction == FORWARD && $curRes->src()) {
3021: $resource = $curRes; $resourceCount++;
3022: }
3023: my $resultingVal = $curRes->{DATA}->{$valName};
3024: my $nextResources = $curRes->$nextResourceMethod();
3025: my $nextCount = scalar(@{$nextResources});
3026:
3027: if ($nextCount == 1) { # **3**
3028: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
3029: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
3030: }
3031:
3032: if ($nextCount > 1) { # **4**
3033: foreach my $res (@{$nextResources}) {
3034: my $current = $res->{DATA}->{$valName} || 999999999;
3035: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
3036: }
3037: }
3038: }
3039:
3040: # Assign the final val (**2**)
3041: if (ref($curRes) && $direction == BACKWARD()) {
3042: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
3043: $curRes->{DATA}->{BOT_UP_VAL});
3044:
3045: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
3046: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
3047: }
3048:
3049: $curRes = $iterator->next();
3050: }
3051: }
3052:
3053: # Check: Was this only one resource, a map?
3054: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
3055: my $firstResource = $resource->map_start();
3056: my $finishResource = $resource->map_finish();
3057: return
3058: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3059: $finishResource, $self->{FILTER},
3060: $self->{ALREADY_SEEN},
3061: $self->{CONDITION},
3062: $self->{FORCE_TOP});
3063:
3064: }
3065:
3066: # Set up some bookkeeping information.
3067: $self->{CURRENT_DEPTH} = 0;
3068: $self->{MAX_DEPTH} = $maxDepth;
3069: $self->{STACK} = [];
3070: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3071: $self->{FINISHED} = 0; # When true, the iterator has finished
3072:
3073: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
3074: push @{$self->{STACK}}, [];
3075: }
3076:
3077: # Prime the recursion w/ the first resource **5**
3078: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3079: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3080:
3081: bless ($self);
3082:
3083: return $self;
3084: }
3085:
3086: sub next {
3087: my $self = shift;
3088: my $closeAllPages=shift;
3089: if ($self->{FINISHED}) {
3090: return END_ITERATOR();
3091: }
3092:
3093: # If we want to return the top-level map object, and haven't yet,
3094: # do so.
3095: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3096: $self->{HAVE_RETURNED_0} = 1;
3097: return $self->{NAV_MAP}->getById('0.0');
3098: }
3099: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
3100: $self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
3101: return $self->BEGIN_MAP();
3102: }
3103:
3104: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3105: # grab the next from the recursive iterator
3106: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3107:
3108: # is it a begin or end map? If so, update the depth
3109: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3110: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3111:
3112: # Are we back at depth 0? If so, stop recursing
3113: if ($self->{RECURSIVE_DEPTH} == 0) {
3114: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3115: }
3116:
3117: return $next;
3118: }
3119:
3120: if (defined($self->{FORCE_NEXT})) {
3121: my $tmp = $self->{FORCE_NEXT};
3122: $self->{FORCE_NEXT} = undef;
3123: return $tmp;
3124: }
3125:
3126: # Have we not yet begun? If not, return BEGIN_MAP and
3127: # remember we've started.
3128: if ( !$self->{STARTED} ) {
3129: $self->{STARTED} = 1;
3130: return $self->BEGIN_MAP();
3131: }
3132:
3133: # Here's the guts of the iterator.
3134:
3135: # Find the next resource, if any.
3136: my $found = 0;
3137: my $i = $self->{MAX_DEPTH};
3138: my $newDepth;
3139: my $here;
3140: while ( $i >= 0 && !$found ) {
3141: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3142: $here = pop @{$self->{STACK}->[$i]}; # **7**
3143: $found = 1;
3144: $newDepth = $i;
3145: }
3146: $i--;
3147: }
3148:
3149: # If we still didn't find anything, we're done.
3150: if ( !$found ) {
3151: # We need to get back down to the correct branch depth
3152: if ( $self->{CURRENT_DEPTH} > 0 ) {
3153: $self->{CURRENT_DEPTH}--;
3154: return END_BRANCH();
3155: } else {
3156: $self->{FINISHED} = 1;
3157: return END_MAP();
3158: }
3159: }
3160:
3161: # If this is not a resource, it must be an END_BRANCH marker we want
3162: # to return directly.
3163: if (!ref($here)) { # **8**
3164: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3165: $self->{CURRENT_DEPTH}--;
3166: return $here;
3167: }
3168: }
3169:
3170: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3171: $self->{HERE} = $here;
3172:
3173: # Get to the right level
3174: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3175: push @{$self->{STACK}->[$newDepth]}, $here;
3176: $self->{CURRENT_DEPTH}--;
3177: return END_BRANCH();
3178: }
3179: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3180: push @{$self->{STACK}->[$newDepth]}, $here;
3181: $self->{CURRENT_DEPTH}++;
3182: return BEGIN_BRANCH();
3183: }
3184:
3185: # If we made it here, we have the next resource, and we're at the
3186: # right branch level. So let's examine the resource for where
3187: # we can get to from here.
3188:
3189: # So we need to look at all the resources we can get to from here,
3190: # categorize them if we haven't seen them, remember if we have a new
3191: my $nextUnfiltered = $here->getNext();
3192: my $maxDepthAdded = -1;
3193:
3194: for (@$nextUnfiltered) {
3195: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3196: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3197: push @{$self->{STACK}->[$depth]}, $_;
3198: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3199: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3200: }
3201: }
3202:
3203: # Is this the end of a branch? If so, all of the resources examined above
3204: # led to lower levels than the one we are currently at, so we push a END_BRANCH
3205: # marker onto the stack so we don't forget.
3206: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3207: # BC branch and gets to C, it will see F as the only next resource, but it's
3208: # one level lower. Thus, this is the end of the branch, since there are no
3209: # more resources added to this level or above.
3210: # We don't do this if the examined resource is the finish resource,
3211: # because the condition given above is true, but the "END_MAP" will
3212: # take care of things and we should already be at depth 0.
3213: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3214: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3215: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3216: }
3217:
3218: # That ends the main iterator logic. Now, do we want to recurse
3219: # down this map (if this resource is a map)?
3220: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3221: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3222: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3223: my $firstResource = $self->{HERE}->map_start();
3224: my $finishResource = $self->{HERE}->map_finish();
3225:
3226: $self->{RECURSIVE_ITERATOR} =
3227: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3228: $finishResource, $self->{FILTER},
3229: $self->{ALREADY_SEEN},
3230: $self->{CONDITION},
3231: $self->{FORCE_TOP});
3232: }
3233:
3234: # If this is a blank resource, don't actually return it.
3235: # Should you ever find you need it, make sure to add an option to the code
3236: # that you can use; other things depend on this behavior.
3237: my $browsePriv = $self->{HERE}->browsePriv();
3238: if (!$self->{HERE}->src() ||
3239: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3240: return $self->next($closeAllPages);
3241: }
3242:
3243: return $self->{HERE};
3244:
3245: }
3246:
3247: =pod
3248:
3249: The other method available on the iterator is B<getStack>, which
3250: returns an array populated with the current 'stack' of maps, as
3251: references to the resource objects. Example: This is useful when
3252: making the navigation map, as we need to check whether we are under a
3253: page map to see if we need to link directly to the resource, or to the
3254: page. The first elements in the array will correspond to the top of
3255: the stack (most inclusive map).
3256:
3257: =cut
3258:
3259: sub getStack {
3260: my $self=shift;
3261:
3262: my @stack;
3263:
3264: $self->populateStack(\@stack);
3265:
3266: return \@stack;
3267: }
3268:
3269: # Private method: Calls the iterators recursively to populate the stack.
3270: sub populateStack {
3271: my $self=shift;
3272: my $stack = shift;
3273:
3274: push @$stack, $self->{HERE} if ($self->{HERE});
3275:
3276: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3277: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3278: }
3279: }
3280:
3281: 1;
3282:
3283: package Apache::lonnavmaps::DFSiterator;
3284: use Scalar::Util qw(weaken);
3285: use Apache::lonnet;
3286:
3287: # Not documented in the perldoc: This is a simple iterator that just walks
3288: # through the nav map and presents the resources in a depth-first search
3289: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3290: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3291: # useful for pre-processing of some kind, and is in fact used by the main
3292: # iterator that way, but that's about it.
3293: # One could imagine merging this into the init routine of the main iterator,
3294: # but this might as well be left separate, since it is possible some other
3295: # use might be found for it. - Jeremy
3296:
3297: # Unlike the main iterator, this DOES return all resources, even blank ones.
3298: # The main iterator needs them to correctly preprocess the map.
3299:
3300: sub BEGIN_MAP { return 1; } # begining of a new map
3301: sub END_MAP { return 2; } # end of the map
3302: sub FORWARD { return 1; } # go forward
3303: sub BACKWARD { return 2; }
3304:
3305: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3306: # filter hash ref (or undef), already seen hash or undef, condition
3307: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3308: sub new {
3309: # magic invocation to create a class instance
3310: my $proto = shift;
3311: my $class = ref($proto) || $proto;
3312: my $self = {};
3313:
3314: weaken($self->{NAV_MAP} = shift);
3315: return undef unless ($self->{NAV_MAP});
3316:
3317: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3318: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3319:
3320: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3321: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3322:
3323: # If the given resources are just the ID of the resource, get the
3324: # objects
3325: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3326: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3327: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3328: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3329:
3330: $self->{FILTER} = shift;
3331:
3332: # A hash, used as a set, of resource already seen
3333: $self->{ALREADY_SEEN} = shift;
3334: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3335: $self->{CONDITION} = shift;
3336: $self->{DIRECTION} = shift || FORWARD();
3337:
3338: # Flag: Have we started yet?
3339: $self->{STARTED} = 0;
3340:
3341: # Should we continue calling the recursive iterator, if any?
3342: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3343: # The recursive iterator, if any
3344: $self->{RECURSIVE_ITERATOR} = undef;
3345: # Are we recursing on a map, or a branch?
3346: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3347: # And the count of how deep it is, so that this iterator can keep track of
3348: # when to pick back up again.
3349: $self->{RECURSIVE_DEPTH} = 0;
3350:
3351: # For keeping track of our branches, we maintain our own stack
3352: $self->{STACK} = [];
3353:
3354: # Start with the first resource
3355: if ($self->{DIRECTION} == FORWARD) {
3356: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3357: } else {
3358: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3359: }
3360:
3361: bless($self);
3362: return $self;
3363: }
3364:
3365: sub next {
3366: my $self = shift;
3367:
3368: # Are we using a recursive iterator? If so, pull from that and
3369: # watch the depth; we want to resume our level at the correct time.
3370: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3371: # grab the next from the recursive iterator
3372: my $next = $self->{RECURSIVE_ITERATOR}->next();
3373:
3374: # is it a begin or end map? Update depth if so
3375: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3376: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3377:
3378: # Are we back at depth 0? If so, stop recursing.
3379: if ($self->{RECURSIVE_DEPTH} == 0) {
3380: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3381: }
3382:
3383: return $next;
3384: }
3385:
3386: # Is there a current resource to grab? If not, then return
3387: # END_MAP, which will end the iterator.
3388: if (scalar(@{$self->{STACK}}) == 0) {
3389: return $self->END_MAP();
3390: }
3391:
3392: # Have we not yet begun? If not, return BEGIN_MAP and
3393: # remember that we've started.
3394: if ( !$self->{STARTED} ) {
3395: $self->{STARTED} = 1;
3396: return $self->BEGIN_MAP;
3397: }
3398:
3399: # Get the next resource in the branch
3400: $self->{HERE} = pop @{$self->{STACK}};
3401:
3402: # remember that we've seen this, so we don't return it again later
3403: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3404:
3405: # Get the next possible resources
3406: my $nextUnfiltered;
3407: if ($self->{DIRECTION} == FORWARD()) {
3408: $nextUnfiltered = $self->{HERE}->getNext();
3409: } else {
3410: $nextUnfiltered = $self->{HERE}->getPrevious();
3411: }
3412: my $next = [];
3413:
3414: # filter the next possibilities to remove things we've
3415: # already seen.
3416: foreach my $item (@$nextUnfiltered) {
3417: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3418: push @$next, $item;
3419: }
3420: }
3421:
3422: while (@$next) {
3423: # copy the next possibilities over to the stack
3424: push @{$self->{STACK}}, shift @$next;
3425: }
3426:
3427: # If this is a map and we want to recurse down it... (not filtered out)
3428: if ($self->{HERE}->is_map() &&
3429: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3430: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3431: my $firstResource = $self->{HERE}->map_start();
3432: my $finishResource = $self->{HERE}->map_finish();
3433:
3434: $self->{RECURSIVE_ITERATOR} =
3435: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3436: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3437: $self->{CONDITION}, $self->{DIRECTION});
3438: }
3439:
3440: return $self->{HERE};
3441: }
3442:
3443: # Identical to the full iterator methods of the same name. Hate to copy/paste
3444: # but I also hate to "inherit" either iterator from the other.
3445:
3446: sub getStack {
3447: my $self=shift;
3448:
3449: my @stack;
3450:
3451: $self->populateStack(\@stack);
3452:
3453: return \@stack;
3454: }
3455:
3456: # Private method: Calls the iterators recursively to populate the stack.
3457: sub populateStack {
3458: my $self=shift;
3459: my $stack = shift;
3460:
3461: push @$stack, $self->{HERE} if ($self->{HERE});
3462:
3463: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3464: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3465: }
3466: }
3467:
3468: 1;
3469:
3470: package Apache::lonnavmaps::resource;
3471: use Scalar::Util qw(weaken);
3472: use Apache::lonnet;
3473:
3474: =pod
3475:
3476: =head1 Object: resource
3477:
3478: X<resource, navmap object>
3479: A resource object encapsulates a resource in a resource map, allowing
3480: easy manipulation of the resource, querying the properties of the
3481: resource (including user properties), and represents a reference that
3482: can be used as the canonical representation of the resource by
3483: lonnavmap clients like renderers.
3484:
3485: A resource only makes sense in the context of a navmap, as some of the
3486: data is stored in the navmap object.
3487:
3488: You will probably never need to instantiate this object directly. Use
3489: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3490: starting resource.
3491:
3492: Resource objects respect the parameter_hiddenparts, which suppresses
3493: various parts according to the wishes of the map author. As of this
3494: writing, there is no way to override this parameter, and suppressed
3495: parts will never be returned, nor will their response types or ids be
3496: stored.
3497:
3498: =head2 Overview
3499:
3500: A B<Resource> is the most granular type of object in LON-CAPA that can
3501: be included in a course. It can either be a particular resource, like
3502: an HTML page, external resource, problem, etc., or it can be a
3503: container sequence, such as a "page" or a "map".
3504:
3505: To see a sequence from the user's point of view, please see the
3506: B<Creating a Course: Maps and Sequences> chapter of the Author's
3507: Manual.
3508:
3509: A Resource Object, once obtained from a navmap object via a B<getBy*>
3510: method of the navmap, or from an iterator, allows you to query
3511: information about that resource.
3512:
3513: Generally, you do not ever want to create a resource object yourself,
3514: so creation has been left undocumented. Always retrieve resources
3515: from navmap objects.
3516:
3517: =head3 Identifying Resources
3518:
3519: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3520: unique to that resource for a given course. X<resource ID, in big hash>
3521: The Resource ID has the form #.#, where the first number is the same
3522: for every resource in a map, and the second is unique. For instance,
3523: for a course laid out like this:
3524:
3525: * Problem 1
3526: * Map
3527: * Resource 2
3528: * Resource 3
3529:
3530: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3531: C<Resource 3> will share a first number. The second number may end up
3532: re-used between the two groups.
3533:
3534: The resource ID is only used in the big hash, but can be used in the
3535: context of a course to identify a resource easily. (For instance, the
3536: printing system uses it to record which resources from a sequence you
3537: wish to print.)
3538:
3539: X<symb> X<resource, symb>
3540: All resources also have B<symb>s, which uniquely identify a resource
3541: in a course. Many internal LON-CAPA functions expect a symb. A symb
3542: carries along with it the URL of the resource, and the map it appears
3543: in. Symbs are much larger than resource IDs.
3544:
3545: =cut
3546:
3547: sub new {
3548: # magic invocation to create a class instance
3549: my $proto = shift;
3550: my $class = ref($proto) || $proto;
3551: my $self = {};
3552:
3553: weaken($self->{NAV_MAP} = shift);
3554: $self->{ID} = shift;
3555:
3556: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3557: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3558:
3559: # Store this new resource in the parent nav map's cache.
3560: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3561: $self->{RESOURCE_ERROR} = 0;
3562:
3563: # A hash that can be used by two-pass algorithms to store data
3564: # about this resource in. Not used by the resource object
3565: # directly.
3566: $self->{DATA} = {};
3567:
3568: bless($self);
3569:
3570: return $self;
3571: }
3572:
3573: # private function: simplify the NAV_HASH lookups we keep doing
3574: # pass the name, and to automatically append my ID, pass a true val on the
3575: # second param
3576: sub navHash {
3577: my $self = shift;
3578: my $param = shift;
3579: my $id = shift;
3580: my $arg = $param . ($id?$self->{ID}:"");
3581: if (ref($self) && ref($self->{NAV_MAP}) && defined($arg)) {
3582: return $self->{NAV_MAP}->navhash($arg);
3583: }
3584: return;
3585: }
3586:
3587: =pod
3588:
3589: =head2 Methods
3590:
3591: Once you have a resource object, here's what you can do with it:
3592:
3593: =head3 Attribute Retrieval
3594:
3595: Every resource has certain attributes that can be retrieved and used:
3596:
3597: =over 4
3598:
3599: =item * B<ID>: Every resource has an ID that is unique for that
3600: resource in the course it is in. The ID is actually in the hash
3601: representing the resource, so for a resource object $res, obtain
3602: it via C<$res->{ID}).
3603:
3604: =item * B<compTitle>:
3605:
3606: Returns a "composite title", that is equal to $res->title() if the
3607: resource has a title, and is otherwise the last part of the URL (e.g.,
3608: "problem.problem").
3609:
3610: =item * B<ext>:
3611:
3612: Returns true if the resource is external.
3613:
3614: =item * B<kind>:
3615:
3616: Returns the kind of the resource from the compiled nav map.
3617:
3618: =item * B<randomout>:
3619:
3620: Returns true if this resource was chosen to NOT be shown to the user
3621: by the random map selection feature. In other words, this is usually
3622: false.
3623:
3624: =item * B<randompick>:
3625:
3626: Returns the number of randomly picked items for a map if the randompick
3627: feature is being used on the map.
3628:
3629: =item * B<randomorder>:
3630:
3631: Returns true for a map if the randomorder feature is being used on the
3632: map.
3633:
3634: =item * B<src>:
3635:
3636: Returns the source for the resource.
3637:
3638: =item * B<symb>:
3639:
3640: Returns the symb for the resource.
3641:
3642: =item * B<title>:
3643:
3644: Returns the title of the resource.
3645:
3646: =back
3647:
3648: =cut
3649:
3650: # These info functions can be used directly, as they don't return
3651: # resource information.
3652: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3653: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3654: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3655: sub from { my $self=shift; return $self->navHash("from_", 1); }
3656: # considered private and undocumented
3657: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3658: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3659: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3660: sub randompick {
3661: my $self = shift;
3662: my $randompick = $self->parmval('randompick');
3663: return $randompick;
3664: }
3665: sub randomorder {
3666: my $self = shift;
3667: my $randomorder = $self->parmval('randomorder');
3668: return ($randomorder =~ /^yes$/i);
3669: }
3670: sub link {
3671: my $self=shift;
3672: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3673: return $self->src;
3674: }
3675: sub src {
3676: my $self=shift;
3677: return $self->navHash("src_", 1);
3678: }
3679: sub shown_symb {
3680: my $self=shift;
3681: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3682: return $self->symb();
3683: }
3684: sub id {
3685: my $self=shift;
3686: return $self->{ID};
3687: }
3688: sub enclosing_map_src {
3689: my $self=shift;
3690: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3691: return $self->navHash('map_id_'.$first);
3692: }
3693: sub symb {
3694: my $self=shift;
3695: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3696: my $symbSrc = &Apache::lonnet::declutter($self->src());
3697: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3698: . '___' . $second . '___' . $symbSrc;
3699: return &Apache::lonnet::symbclean($symb);
3700: }
3701: sub wrap_symb {
3702: my $self = shift;
3703: return $self->{NAV_MAP}->wrap_symb($self->symb());
3704: }
3705: sub title {
3706: my $self=shift;
3707: if ($self->{ID} eq '0.0') {
3708: # If this is the top-level map, return the title of the course
3709: # since this map can not be titled otherwise.
3710: return $env{'course.'.$env{'request.course.id'}.'.description'};
3711: }
3712: return $self->navHash("title_", 1); }
3713: # considered private and undocumented
3714: sub to { my $self=shift; return $self->navHash("to_", 1); }
3715: sub condition {
3716: my $self=shift;
3717: my $undercond=$self->navHash("undercond_", 1);
3718: if (!defined($undercond)) { return 1; };
3719: my $condid=$self->navHash("condid_$undercond");
3720: if (!defined($condid)) { return 1; };
3721: my $condition=&Apache::lonnet::directcondval($condid);
3722: return $condition;
3723: }
3724: sub condval {
3725: my $self=shift;
3726: my ($pathname,$filename) =
3727: &Apache::lonnet::split_uri_for_cond($self->src());
3728:
3729: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3730: /\&\Q$filename\E\:([\d\|]+)\&/);
3731: if ($match) {
3732: return &Apache::lonnet::condval($1);
3733: }
3734: return 0;
3735: }
3736: sub compTitle {
3737: my $self = shift;
3738: my $title = $self->title();
3739: $title=~s/\&colon\;/\:/gs;
3740: if (!$title) {
3741: $title = $self->src();
3742: $title = substr($title, rindex($title, '/') + 1);
3743: }
3744: return $title;
3745: }
3746:
3747: =pod
3748:
3749: B<Predicate Testing the Resource>
3750:
3751: These methods are shortcuts to deciding if a given resource has a given property.
3752:
3753: =over 4
3754:
3755: =item * B<is_map>:
3756:
3757: Returns true if the resource is a map type.
3758:
3759: =item * B<is_problem>:
3760:
3761: Returns true if the resource is a problem type, false
3762: otherwise. (Looks at the extension on the src field; might need more
3763: to work correctly.)
3764:
3765: =item * B<is_page>:
3766:
3767: Returns true if the resource is a page.
3768:
3769: =item * B<is_sequence>:
3770:
3771: Returns true if the resource is a sequence.
3772:
3773: =back
3774:
3775: =cut
3776:
3777: sub hasResource {
3778: my $self = shift;
3779: return $self->{NAV_MAP}->hasResource(@_);
3780: }
3781:
3782: sub retrieveResources {
3783: my $self = shift;
3784: return $self->{NAV_MAP}->retrieveResources(@_);
3785: }
3786:
3787: sub is_exam {
3788: my ($self,$part) = @_;
3789: my $type = $self->parmval('type',$part);
3790: if ($type eq 'exam') {
3791: return 1;
3792: }
3793: if ($self->src() =~ /\.(exam)$/) {
3794: return 1;
3795: }
3796: return 0;
3797: }
3798: sub is_html {
3799: my $self=shift;
3800: my $src = $self->src();
3801: return ($src =~ /html$/);
3802: }
3803: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3804: sub is_page {
3805: my $self=shift;
3806: my $src = $self->src();
3807: return $self->navHash("is_map_", 1) &&
3808: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3809: }
3810: sub is_practice {
3811: my $self=shift;
3812: my ($part) = @_;
3813: my $type = $self->parmval('type',$part);
3814: if ($type eq 'practice') {
3815: return 1;
3816: }
3817: return 0;
3818: }
3819: sub is_problem {
3820: my $self=shift;
3821: my $src = $self->src();
3822: if ($src =~ /$LONCAPA::assess_re/) {
3823: return !($self->is_practice());
3824: }
3825: return 0;
3826: }
3827: #
3828: # The has below is the set of status that are considered 'incomplete'
3829: #
3830: my %incomplete_hash =
3831: (
3832: TRIES_LEFT() => 1,
3833: OPEN() => 1,
3834: ATTEMPTED() => 1
3835:
3836: );
3837: #
3838: # Return tru if a problem is incomplete... for now incomplete means that
3839: # any part of the problem is incomplete.
3840: # Note that if the resources is not a problem, 0 is returned.
3841: #
3842: sub is_incomplete {
3843: my $self = shift;
3844: if ($self->is_problem()) {
3845: foreach my $part (@{$self->parts()}) {
3846: if (exists($incomplete_hash{$self->status($part)})) {
3847: return 1;
3848: }
3849: }
3850: }
3851: return 0;
3852:
3853: }
3854: sub is_raw_problem {
3855: my $self=shift;
3856: my $src = $self->src();
3857: if ($src =~ /$LONCAPA::assess_re/) {
3858: return 1;
3859: }
3860: return 0;
3861: }
3862:
3863: sub contains_problem {
3864: my $self=shift;
3865: if ($self->is_page()) {
3866: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3867: return $hasProblem;
3868: }
3869: return 0;
3870: }
3871: sub map_contains_problem {
3872: my $self=shift;
3873: if ($self->is_map()) {
3874: my $has_problem=
3875: $self->hasResource($self,sub { $_[0]->is_problem() },1);
3876: return $has_problem;
3877: }
3878: return 0;
3879: }
3880: sub is_sequence {
3881: my $self=shift;
3882: return $self->navHash("is_map_", 1) &&
3883: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3884: }
3885: sub is_survey {
3886: my $self = shift();
3887: my $part = shift();
3888: my $type = $self->parmval('type',$part);
3889: if (($type eq 'survey') || ($type eq 'surveycred')) {
3890: return 1;
3891: }
3892: if ($self->src() =~ /\.(survey)$/) {
3893: return 1;
3894: }
3895: return 0;
3896: }
3897: sub is_anonsurvey {
3898: my $self = shift();
3899: my $part = shift();
3900: my $type = $self->parmval('type',$part);
3901: if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
3902: return 1;
3903: }
3904: return 0;
3905: }
3906: sub is_task {
3907: my $self=shift;
3908: my $src = $self->src();
3909: return ($src =~ /\.(task)$/)
3910: }
3911:
3912: sub is_empty_sequence {
3913: my $self=shift;
3914: my $src = $self->src();
3915: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3916: }
3917:
3918: # Private method: Shells out to the parmval in the nav map, handler parts.
3919: sub parmval {
3920: my $self = shift;
3921: my $what = shift;
3922: my $part = shift;
3923: if (!defined($part)) {
3924: $part = '0';
3925: }
3926: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3927: }
3928:
3929: =pod
3930:
3931: B<Map Methods>
3932:
3933: These methods are useful for getting information about the map
3934: properties of the resource, if the resource is a map (B<is_map>).
3935:
3936: =over 4
3937:
3938: =item * B<map_finish>:
3939:
3940: Returns a reference to a resource object corresponding to the finish
3941: resource of the map.
3942:
3943: =item * B<map_pc>:
3944:
3945: Returns the pc value of the map, which is the first number that
3946: appears in the resource ID of the resources in the map, and is the
3947: number that appears around the middle of the symbs of the resources in
3948: that map.
3949:
3950: =item * B<map_start>:
3951:
3952: Returns a reference to a resource object corresponding to the start
3953: resource of the map.
3954:
3955: =item * B<map_type>:
3956:
3957: Returns a string with the type of the map in it.
3958:
3959: =item *B<map_hierarchy>:
3960:
3961: Returns a string with a comma-separated ordered list of map_pc IDs
3962: for the hierarchy of maps containing a map, with the top level
3963: map first, then descending to deeper levels, with the enclosing map last.
3964:
3965: =back
3966:
3967: =cut
3968:
3969: sub map_finish {
3970: my $self = shift;
3971: my $src = $self->src();
3972: $src = &Apache::lonnet::clutter($src);
3973: my $res = $self->navHash("map_finish_$src", 0);
3974: $res = $self->{NAV_MAP}->getById($res);
3975: return $res;
3976: }
3977: sub map_pc {
3978: my $self = shift;
3979: my $src = $self->src();
3980: return $self->navHash("map_pc_$src", 0);
3981: }
3982: sub map_start {
3983: my $self = shift;
3984: my $src = $self->src();
3985: $src = &Apache::lonnet::clutter($src);
3986: my $res = $self->navHash("map_start_$src", 0);
3987: $res = $self->{NAV_MAP}->getById($res);
3988: return $res;
3989: }
3990: sub map_type {
3991: my $self = shift;
3992: my $pc = $self->map_pc();
3993: return $self->navHash("map_type_$pc", 0);
3994: }
3995: sub map_hierarchy {
3996: my $self = shift;
3997: my $pc = $self->map_pc();
3998: return $self->navHash("map_hierarchy_$pc", 0);
3999: }
4000:
4001: #####
4002: # Property queries
4003: #####
4004:
4005: # These functions will be responsible for returning the CORRECT
4006: # VALUE for the parameter, no matter what. So while they may look
4007: # like direct calls to parmval, they can be more than that.
4008: # So, for instance, the duedate function should use the "duedatetype"
4009: # information, rather than the resource object user.
4010:
4011: =pod
4012:
4013: =head2 Resource Parameters
4014:
4015: In order to use the resource parameters correctly, the nav map must
4016: have been instantiated with genCourseAndUserOptions set to true, so
4017: the courseopt and useropt is read correctly. Then, you can call these
4018: functions to get the relevant parameters for the resource. Each
4019: function defaults to part "0", but can be directed to another part by
4020: passing the part as the parameter.
4021:
4022: These methods are responsible for getting the parameter correct, not
4023: merely reflecting the contents of the GDBM hashes. As we move towards
4024: dates relative to other dates, these methods should be updated to
4025: reflect that. (Then, anybody using these methods will not have to update
4026: their code.)
4027:
4028: =over 4
4029:
4030: =item * B<printable>
4031:
4032: returns true if the current date is such that the
4033: specified resource part is printable.
4034:
4035: =item * B<resprintable>
4036:
4037: Returns true if all parts in the resource are printable making the
4038: entire resource printable.
4039:
4040: =item * B<acc>
4041:
4042: Get the Client IP/Name Access Control information.
4043:
4044: =item * B<answerdate>:
4045:
4046: Get the answer-reveal date for the problem.
4047:
4048: =item * B<awarded>:
4049:
4050: Gets the awarded value for the problem part. Requires genUserData set to
4051: true when the navmap object was created.
4052:
4053: =item * B<duedate>:
4054:
4055: Get the due date for the problem.
4056:
4057: =item * B<tries>:
4058:
4059: Get the number of tries the student has used on the problem.
4060:
4061: =item * B<maxtries>:
4062:
4063: Get the number of max tries allowed.
4064:
4065: =item * B<opendate>:
4066:
4067: Get the open date for the problem.
4068:
4069: =item * B<sig>:
4070:
4071: Get the significant figures setting.
4072:
4073: =item * B<tol>:
4074:
4075: Get the tolerance for the problem.
4076:
4077: =item * B<tries>:
4078:
4079: Get the number of tries the user has already used on the problem.
4080:
4081: =item * B<type>:
4082:
4083: Get the question type for the problem.
4084:
4085: =item * B<weight>:
4086:
4087: Get the weight for the problem.
4088:
4089: =back
4090:
4091: =cut
4092:
4093: sub printable {
4094:
4095: my ($self, $part) = @_;
4096:
4097: # Get the print open/close dates for the resource.
4098:
4099: my $start = $self->parmval("prinstartdate", $part);
4100: my $end = $self->parmval("printenddate", $part);
4101:
4102: # The following cases apply:
4103: # - No dates set: Printable.
4104: # - Start date set but no end date: Printable if now >= start date.
4105: # - End date set but no start date: Printable if now <= end date.
4106: # - both defined: printable if start <= now <= end
4107: #
4108: my $now = time();
4109:
4110: my $startok = 1;
4111: my $endok = 1;
4112:
4113: if ((defined $start) && ($start ne '')) {
4114: $startok = $start <= $now;
4115: }
4116: if ((defined $end) && ($end != '')) {
4117: $endok = $end >= $now;
4118: }
4119: return $startok && $endok;
4120: }
4121:
4122: sub resprintable {
4123: my $self = shift;
4124:
4125: # get parts...or realize there are no parts.
4126:
4127: my $partsref = $self->parts();
4128: my @parts = @$partsref;
4129:
4130: if ((!defined(@parts)) || (scalar(@parts) == 0)) {
4131: return $self->printable(0);
4132: } else {
4133: foreach my $part (@parts) {
4134: if (!$self->printable($part)) {
4135: return 0;
4136: }
4137: }
4138: return 1;
4139: }
4140: }
4141:
4142: sub acc {
4143: (my $self, my $part) = @_;
4144: my $acc = $self->parmval("acc", $part);
4145: return $acc;
4146: }
4147: sub answerdate {
4148: (my $self, my $part) = @_;
4149: # Handle intervals
4150: my $answerdatetype = $self->parmval("answerdate.type", $part);
4151: my $answerdate = $self->parmval("answerdate", $part);
4152: my $duedate = $self->parmval("duedate", $part);
4153: if ($answerdatetype eq 'date_interval') {
4154: $answerdate = $duedate + $answerdate;
4155: }
4156: return $answerdate;
4157: }
4158: sub awarded {
4159: my $self = shift; my $part = shift;
4160: $self->{NAV_MAP}->get_user_data();
4161: if (!defined($part)) { $part = '0'; }
4162: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
4163: }
4164: sub taskversion {
4165: my $self = shift; my $part = shift;
4166: $self->{NAV_MAP}->get_user_data();
4167: if (!defined($part)) { $part = '0'; }
4168: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.version'};
4169: }
4170: sub taskstatus {
4171: my $self = shift; my $part = shift;
4172: $self->{NAV_MAP}->get_user_data();
4173: if (!defined($part)) { $part = '0'; }
4174: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
4175: }
4176: sub solved {
4177: my $self = shift; my $part = shift;
4178: $self->{NAV_MAP}->get_user_data();
4179: if (!defined($part)) { $part = '0'; }
4180: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.solved'};
4181: }
4182: sub checkedin {
4183: my $self = shift; my $part = shift;
4184: $self->{NAV_MAP}->get_user_data();
4185: if (!defined($part)) { $part = '0'; }
4186: if ($self->is_task()) {
4187: my $version = $self->taskversion($part);
4188: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
4189: } else {
4190: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin.slot'});
4191: }
4192: }
4193: # this should work exactly like the copy in lonhomework.pm
4194: # Why is there a copy in lonhomework? Why not centralized?
4195: #
4196: # TODO: Centralize duedate.
4197: #
4198:
4199: sub duedate {
4200: (my $self, my $part) = @_;
4201: my $date;
4202: my @interval=$self->parmval("interval", $part);
4203: my $due_date=$self->parmval("duedate", $part);
4204: if ($interval[0] =~ /\d+/) {
4205: my $first_access=&Apache::lonnet::get_first_access($interval[1],
4206: $self->symb);
4207: if (defined($first_access)) {
4208: my $interval = $first_access+$interval[0];
4209: $date = (!$due_date || $interval < $due_date) ? $interval
4210: : $due_date;
4211: } else {
4212: $date = $due_date;
4213: }
4214: } else {
4215: $date = $due_date;
4216: }
4217: return $date;
4218: }
4219: sub handgrade {
4220: (my $self, my $part) = @_;
4221: my @response_ids = $self->responseIds($part);
4222: if (@response_ids) {
4223: foreach my $response_id (@response_ids) {
4224: my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
4225: if (lc($handgrade) eq 'yes') {
4226: return 'yes';
4227: }
4228: }
4229: }
4230: my $handgrade = $self->parmval("handgrade", $part);
4231: return $handgrade;
4232: }
4233: sub maxtries {
4234: (my $self, my $part) = @_;
4235: my $maxtries = $self->parmval("maxtries", $part);
4236: return $maxtries;
4237: }
4238: sub opendate {
4239: (my $self, my $part) = @_;
4240: my $opendatetype = $self->parmval("opendate.type", $part);
4241: my $opendate = $self->parmval("opendate", $part);
4242: if ($opendatetype eq 'date_interval') {
4243: my $duedate = $self->duedate($part);
4244: $opendate = $duedate - $opendate;
4245: }
4246: return $opendate;
4247: }
4248: sub problemstatus {
4249: (my $self, my $part) = @_;
4250: my $problemstatus = $self->parmval("problemstatus", $part);
4251: return lc($problemstatus);
4252: }
4253: sub sig {
4254: (my $self, my $part) = @_;
4255: my $sig = $self->parmval("sig", $part);
4256: return $sig;
4257: }
4258: sub tol {
4259: (my $self, my $part) = @_;
4260: my $tol = $self->parmval("tol", $part);
4261: return $tol;
4262: }
4263: sub tries {
4264: my $self = shift;
4265: my $tries = $self->queryRestoreHash('tries', shift);
4266: if (!defined($tries)) { return '0';}
4267: return $tries;
4268: }
4269: sub type {
4270: (my $self, my $part) = @_;
4271: my $type = $self->parmval("type", $part);
4272: return $type;
4273: }
4274: sub weight {
4275: my $self = shift; my $part = shift;
4276: if (!defined($part)) { $part = '0'; }
4277: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
4278: $self->symb(), $self->{DOMAIN},
4279: $self->{USERNAME},
4280: $env{'request.course.sec'});
4281: return $weight;
4282: }
4283: sub part_display {
4284: my $self= shift(); my $partID = shift();
4285: if (! defined($partID)) { $partID = '0'; }
4286: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
4287: $self->symb);
4288: if (! defined($display) || $display eq '') {
4289: $display = $partID;
4290: }
4291: return $display;
4292: }
4293: sub slot_control {
4294: my $self=shift(); my $part = shift();
4295: if (!defined($part)) { $part = '0'; }
4296: my $useslots = $self->parmval("useslots", $part);
4297: my $availablestudent = $self->parmval("availablestudent", $part);
4298: my $available = $self->parmval("available", $part);
4299: return ($useslots,$availablestudent,$available);
4300: }
4301:
4302: # Multiple things need this
4303: sub getReturnHash {
4304: my $self = shift;
4305:
4306: if (!defined($self->{RETURN_HASH})) {
4307: my %tmpHash = &Apache::lonnet::restore($self->symb(),undef,$self->{DOMAIN},$self->{USERNAME});
4308: $self->{RETURN_HASH} = \%tmpHash;
4309: }
4310: }
4311:
4312: ######
4313: # Status queries
4314: ######
4315:
4316: # These methods query the status of problems.
4317:
4318: # If we need to count parts, this function determines the number of
4319: # parts from the metadata. When called, it returns a reference to a list
4320: # of strings corresponding to the parts. (Thus, using it in a scalar context
4321: # tells you how many parts you have in the problem:
4322: # $partcount = scalar($resource->countParts());
4323: # Don't use $self->{PARTS} directly because you don't know if it's been
4324: # computed yet.
4325:
4326: =pod
4327:
4328: =head2 Resource misc
4329:
4330: Misc. functions for the resource.
4331:
4332: =over 4
4333:
4334: =item * B<hasDiscussion>:
4335:
4336: Returns a false value if there has been discussion since the user last
4337: logged in, true if there has. Always returns false if the discussion
4338: data was not extracted when the nav map was constructed.
4339:
4340: =item * B<last_post_time>:
4341:
4342: Returns a false value if there hasn't been discussion otherwise returns
4343: unix timestamp of last time a discussion posting (or edit) was made.
4344:
4345: =item * B<discussion_info>:
4346:
4347: optional argument is a filter (currently can be 'unread');
4348: returns in scalar context the count of the number of discussion postings.
4349:
4350: returns in list context both the count of postings and a hash ref
4351: containing information about the postings (subject, id, timestamp) in a hash.
4352:
4353: 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.
4354:
4355: =item * B<getFeedback>:
4356:
4357: Gets the feedback for the resource and returns the raw feedback string
4358: for the resource, or the null string if there is no feedback or the
4359: email data was not extracted when the nav map was constructed. Usually
4360: used like this:
4361:
4362: for my $url (split(/\,/, $res->getFeedback())) {
4363: my $link = &escape($url);
4364: ...
4365:
4366: and use the link as appropriate.
4367:
4368: =cut
4369:
4370: sub hasDiscussion {
4371: my $self = shift;
4372: return $self->{NAV_MAP}->hasDiscussion($self->symb());
4373: }
4374:
4375: sub last_post_time {
4376: my $self = shift;
4377: return $self->{NAV_MAP}->last_post_time($self->symb());
4378: }
4379:
4380: sub discussion_info {
4381: my ($self,$filter) = @_;
4382: return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
4383: }
4384:
4385: sub getFeedback {
4386: my $self = shift;
4387: my $source = $self->src();
4388: my $symb = $self->symb();
4389: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4390: return $self->{NAV_MAP}->getFeedback($symb,$source);
4391: }
4392:
4393: sub getErrors {
4394: my $self = shift;
4395: my $source = $self->src();
4396: my $symb = $self->symb();
4397: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4398: return $self->{NAV_MAP}->getErrors($symb,$source);
4399: }
4400:
4401: =pod
4402:
4403: =item * B<parts>():
4404:
4405: Returns a list reference containing sorted strings corresponding to
4406: each part of the problem. Single part problems have only a part '0'.
4407: Multipart problems do not return their part '0', since they typically
4408: do not really matter.
4409:
4410: =item * B<countParts>():
4411:
4412: Returns the number of parts of the problem a student can answer. Thus,
4413: for single part problems, returns 1. For multipart, it returns the
4414: number of parts in the problem, not including psuedo-part 0.
4415:
4416: =item * B<countResponses>():
4417:
4418: Returns the total number of responses in the problem a student can answer.
4419:
4420: =item * B<responseTypes>():
4421:
4422: Returns a hash whose keys are the response types. The values are the number
4423: of times each response type is used. This is for the I<entire> problem, not
4424: just a single part.
4425:
4426: =item * B<multipart>():
4427:
4428: Returns true if the problem is multipart, false otherwise. Use this instead
4429: of countParts if all you want is multipart/not multipart.
4430:
4431: =item * B<responseType>($part):
4432:
4433: Returns the response type of the part, without the word "response" on the
4434: end. Example return values: 'string', 'essay', 'numeric', etc.
4435:
4436: =item * B<responseIds>($part):
4437:
4438: Retreives the response IDs for the given part as an array reference containing
4439: strings naming the response IDs. This may be empty.
4440:
4441: =back
4442:
4443: =cut
4444:
4445: sub parts {
4446: my $self = shift;
4447:
4448: if ($self->ext) { return []; }
4449:
4450: $self->extractParts();
4451: return $self->{PARTS};
4452: }
4453:
4454: sub countParts {
4455: my $self = shift;
4456:
4457: my $parts = $self->parts();
4458:
4459: # If I left this here, then it's not necessary.
4460: #my $delta = 0;
4461: #for my $part (@$parts) {
4462: # if ($part eq '0') { $delta--; }
4463: #}
4464:
4465: if ($self->{RESOURCE_ERROR}) {
4466: return 0;
4467: }
4468:
4469: return scalar(@{$parts}); # + $delta;
4470: }
4471:
4472: sub countResponses {
4473: my $self = shift;
4474: my $count;
4475: foreach my $part (@{$self->parts()}) {
4476: $count+= scalar($self->responseIds($part));
4477: }
4478: return $count;
4479: }
4480:
4481: sub responseTypes {
4482: my $self = shift;
4483: my %responses;
4484: foreach my $part (@{$self->parts()}) {
4485: foreach my $responsetype ($self->responseType($part)) {
4486: $responses{$responsetype}++ if (defined($responsetype));
4487: }
4488: }
4489: return %responses;
4490: }
4491:
4492: sub multipart {
4493: my $self = shift;
4494: return $self->countParts() > 1;
4495: }
4496:
4497: sub singlepart {
4498: my $self = shift;
4499: return $self->countParts() == 1;
4500: }
4501:
4502: sub responseType {
4503: my $self = shift;
4504: my $part = shift;
4505:
4506: $self->extractParts();
4507: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4508: return @{$self->{RESPONSE_TYPES}->{$part}};
4509: } else {
4510: return undef;
4511: }
4512: }
4513:
4514: sub responseIds {
4515: my $self = shift;
4516: my $part = shift;
4517:
4518: $self->extractParts();
4519: if (defined($self->{RESPONSE_IDS}->{$part})) {
4520: return @{$self->{RESPONSE_IDS}->{$part}};
4521: } else {
4522: return undef;
4523: }
4524: }
4525:
4526: # Private function: Extracts the parts information, both part names and
4527: # part types, and saves it.
4528: sub extractParts {
4529: my $self = shift;
4530:
4531: return if (defined($self->{PARTS}));
4532: return if ($self->ext);
4533:
4534: $self->{PARTS} = [];
4535:
4536: my %parts;
4537:
4538: # Retrieve part count, if this is a problem
4539: if ($self->is_problem()) {
4540: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4541: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4542:
4543: if ($partorder) {
4544: my @parts;
4545: for my $part (split (/,/,$partorder)) {
4546: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4547: push @parts, $part;
4548: $parts{$part} = 1;
4549: }
4550: }
4551: $self->{PARTS} = \@parts;
4552: } else {
4553: if (!$metadata) {
4554: $self->{RESOURCE_ERROR} = 1;
4555: $self->{PARTS} = [];
4556: $self->{PART_TYPE} = {};
4557: return;
4558: }
4559: foreach my $entry (split(/\,/,$metadata)) {
4560: if ($entry =~ /^(?:part|Task)_(.*)$/) {
4561: my $part = $1;
4562: # This floods the logs if it blows up
4563: if (defined($parts{$part})) {
4564: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4565: }
4566:
4567: # check to see if part is turned off.
4568:
4569: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4570: $parts{$part} = 1;
4571: }
4572: }
4573: }
4574: my @sortedParts = sort keys %parts;
4575: $self->{PARTS} = \@sortedParts;
4576: }
4577:
4578:
4579: # These hashes probably do not need names that end with "Hash"....
4580: my %responseIdHash;
4581: my %responseTypeHash;
4582:
4583:
4584: # Init the responseIdHash
4585: foreach my $part (@{$self->{PARTS}}) {
4586: $responseIdHash{$part} = [];
4587: }
4588:
4589: # Now, the unfortunate thing about this is that parts, part name, and
4590: # response id are delimited by underscores, but both the part
4591: # name and response id can themselves have underscores in them.
4592: # So we have to use our knowlege of part names to figure out
4593: # where the part names begin and end, and even then, it is possible
4594: # to construct ambiguous situations.
4595: foreach my $data (split /,/, $metadata) {
4596: if ($data =~ /^([a-zA-Z]+)response_(.*)/
4597: || $data =~ /^(Task)_(.*)/) {
4598: my $responseType = $1;
4599: my $partStuff = $2;
4600: my $partIdSoFar = '';
4601: my @partChunks = split /_/, $partStuff;
4602: my $i = 0;
4603: for ($i = 0; $i < scalar(@partChunks); $i++) {
4604: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4605: $partIdSoFar .= $partChunks[$i];
4606: if ($parts{$partIdSoFar}) {
4607: my @otherChunks = @partChunks[$i+1..$#partChunks];
4608: my $responseId = join('_', @otherChunks);
4609: if ($self->is_task()) {
4610: push(@{$responseIdHash{$partIdSoFar}},
4611: $partIdSoFar);
4612: } else {
4613: push(@{$responseIdHash{$partIdSoFar}},
4614: $responseId);
4615: }
4616: push(@{$responseTypeHash{$partIdSoFar}},
4617: $responseType);
4618: }
4619: }
4620: }
4621: }
4622: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4623: #
4624: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4625: if ($resorder) {
4626: my @resorder=split(/,/,$resorder);
4627: foreach my $part (keys(%responseIdHash)) {
4628: my $i=0;
4629: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4630: my @neworder;
4631: foreach my $possibleid (@resorder) {
4632: if (exists($resids{$possibleid})) {
4633: push(@neworder,$resids{$possibleid});
4634: }
4635: }
4636: my @ids;
4637: my @type;
4638: foreach my $element (@neworder) {
4639: push (@ids,$responseIdHash{$part}->[$element]);
4640: push (@type,$responseTypeHash{$part}->[$element]);
4641: }
4642: $responseIdHash{$part}=\@ids;
4643: $responseTypeHash{$part}=\@type;
4644: }
4645: }
4646: $self->{RESPONSE_IDS} = \%responseIdHash;
4647: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4648: }
4649:
4650: return;
4651: }
4652:
4653: =pod
4654:
4655: =head2 Resource Status
4656:
4657: Problem resources have status information, reflecting their various
4658: dates and completion statuses.
4659:
4660: There are two aspects to the status: the date-related information and
4661: the completion information.
4662:
4663: Idiomatic usage of these two methods would probably look something
4664: like
4665:
4666: foreach my $part ($resource->parts()) {
4667: my $dateStatus = $resource->getDateStatus($part);
4668: my $completionStatus = $resource->getCompletionStatus($part);
4669:
4670: or
4671:
4672: my $status = $resource->status($part);
4673:
4674: ... use it here ...
4675: }
4676:
4677: Which you use depends on exactly what you are looking for. The
4678: status() function has been optimized for the nav maps display and may
4679: not precisely match what you need elsewhere.
4680:
4681: The symbolic constants shown below can be accessed through the
4682: resource object: C<$res->OPEN>.
4683:
4684: =over 4
4685:
4686: =item * B<getDateStatus>($part):
4687:
4688: ($part defaults to 0). A convenience function that returns a symbolic
4689: constant telling you about the date status of the part. The possible
4690: return values are:
4691:
4692: =back
4693:
4694: B<Date Codes>
4695:
4696: =over 4
4697:
4698: =item * B<OPEN_LATER>:
4699:
4700: The problem will be opened later.
4701:
4702: =item * B<OPEN>:
4703:
4704: Open and not yet due.
4705:
4706:
4707: =item * B<PAST_DUE_ANSWER_LATER>:
4708:
4709: The due date has passed, but the answer date has not yet arrived.
4710:
4711: =item * B<PAST_DUE_NO_ANSWER>:
4712:
4713: The due date has passed and there is no answer opening date set.
4714:
4715: =item * B<ANSWER_OPEN>:
4716:
4717: The answer date is here.
4718:
4719: =item * B<NETWORK_FAILURE>:
4720:
4721: The information is unknown due to network failure.
4722:
4723: =back
4724:
4725: =cut
4726:
4727: # Apparently the compiler optimizes these into constants automatically
4728: sub OPEN_LATER { return 0; }
4729: sub OPEN { return 1; }
4730: sub PAST_DUE_NO_ANSWER { return 2; }
4731: sub PAST_DUE_ANSWER_LATER { return 3; }
4732: sub ANSWER_OPEN { return 4; }
4733: sub NOTHING_SET { return 5; }
4734: sub NETWORK_FAILURE { return 100; }
4735:
4736: # getDateStatus gets the date status for a given problem part.
4737: # Because answer date, due date, and open date are fully independent
4738: # (i.e., it is perfectly possible to *only* have an answer date),
4739: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4740: # (past, future, none given). This function handles this with a decision
4741: # tree. Read the comments to follow the decision tree.
4742:
4743: sub getDateStatus {
4744: my $self = shift;
4745: my $part = shift;
4746: $part = "0" if (!defined($part));
4747:
4748: # Always return network failure if there was one.
4749: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4750:
4751: my $now = time();
4752:
4753: my $open = $self->opendate($part);
4754: my $due = $self->duedate($part);
4755: my $answer = $self->answerdate($part);
4756:
4757: if (!$open && !$due && !$answer) {
4758: # no data on the problem at all
4759: # should this be the same as "open later"? think multipart.
4760: return $self->NOTHING_SET;
4761: }
4762: if (!$open || $now < $open) {return $self->OPEN_LATER}
4763: if (!$due || $now < $due) {return $self->OPEN}
4764: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4765: if ($answer) { return $self->ANSWER_OPEN; }
4766: return PAST_DUE_NO_ANSWER;
4767: }
4768:
4769: =pod
4770:
4771: B<>
4772:
4773: =over 4
4774:
4775: =item * B<getCompletionStatus>($part):
4776:
4777: ($part defaults to 0.) A convenience function that returns a symbolic
4778: constant telling you about the completion status of the part, with the
4779: following possible results:
4780:
4781: =back
4782:
4783: B<Completion Codes>
4784:
4785: =over 4
4786:
4787: =item * B<NOT_ATTEMPTED>:
4788:
4789: Has not been attempted at all.
4790:
4791: =item * B<INCORRECT>:
4792:
4793: Attempted, but wrong by student.
4794:
4795: =item * B<INCORRECT_BY_OVERRIDE>:
4796:
4797: Attempted, but wrong by instructor override.
4798:
4799: =item * B<CORRECT>:
4800:
4801: Correct or correct by instructor.
4802:
4803: =item * B<CORRECT_BY_OVERRIDE>:
4804:
4805: Correct by instructor override.
4806:
4807: =item * B<EXCUSED>:
4808:
4809: Excused. Not yet implemented.
4810:
4811: =item * B<NETWORK_FAILURE>:
4812:
4813: Information not available due to network failure.
4814:
4815: =item * B<ATTEMPTED>:
4816:
4817: Attempted, and not yet graded.
4818:
4819: =item * B<CREDIT_ATTEMPTED>:
4820:
4821: Attempted, and credit received for attempt (survey and anonymous survey only).
4822:
4823: =back
4824:
4825: =cut
4826:
4827: sub NOT_ATTEMPTED { return 10; }
4828: sub INCORRECT { return 11; }
4829: sub INCORRECT_BY_OVERRIDE { return 12; }
4830: sub CORRECT { return 13; }
4831: sub CORRECT_BY_OVERRIDE { return 14; }
4832: sub EXCUSED { return 15; }
4833: sub ATTEMPTED { return 16; }
4834: sub CREDIT_ATTEMPTED { return 17; }
4835:
4836: sub getCompletionStatus {
4837: my $self = shift;
4838: my $part = shift;
4839: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4840:
4841: my $status = $self->queryRestoreHash('solved', $part);
4842:
4843: # Left as separate if statements in case we ever do more with this
4844: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4845: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4846: if ($status eq 'correct_by_override') {
4847: return $self->CORRECT_BY_OVERRIDE;
4848: }
4849: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4850: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4851: if ($status eq 'excused') {return $self->EXCUSED; }
4852: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4853: if ($status eq 'credit_attempted') {
4854: if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
4855: return $self->CREDIT_ATTEMPTED;
4856: } else {
4857: return $self->ATTEMPTED;
4858: }
4859: }
4860: return $self->NOT_ATTEMPTED;
4861: }
4862:
4863: sub queryRestoreHash {
4864: my $self = shift;
4865: my $hashentry = shift;
4866: my $part = shift;
4867: $part = "0" if (!defined($part) || $part eq '');
4868: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4869:
4870: $self->getReturnHash();
4871:
4872: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4873: }
4874:
4875: =pod
4876:
4877: B<Composite Status>
4878:
4879: Along with directly returning the date or completion status, the
4880: resource object includes a convenience function B<status>() that will
4881: combine the two status tidbits into one composite status that can
4882: represent the status of the resource as a whole. This method represents
4883: the concept of the thing we want to display to the user on the nav maps
4884: screen, which is a combination of completion and open status. The precise logic is
4885: documented in the comments of the status method. The following results
4886: may be returned, all available as methods on the resource object
4887: ($res->NETWORK_FAILURE): In addition to the return values that match
4888: the date or completion status, this function can return "ANSWER_SUBMITTED"
4889: if that problemstatus parameter value is set to No, suppressing the
4890: incorrect/correct feedback.
4891:
4892: =over 4
4893:
4894: =item * B<NETWORK_FAILURE>:
4895:
4896: The network has failed and the information is not available.
4897:
4898: =item * B<NOTHING_SET>:
4899:
4900: No dates have been set for this problem (part) at all. (Because only
4901: certain parts of a multi-part problem may be assigned, this can not be
4902: collapsed into "open later", as we do not know a given part will EVER
4903: be opened. For single part, this is the same as "OPEN_LATER".)
4904:
4905: =item * B<CORRECT>:
4906:
4907: For any reason at all, the part is considered correct.
4908:
4909: =item * B<EXCUSED>:
4910:
4911: For any reason at all, the problem is excused.
4912:
4913: =item * B<PAST_DUE_NO_ANSWER>:
4914:
4915: The problem is past due, not considered correct, and no answer date is
4916: set.
4917:
4918: =item * B<PAST_DUE_ANSWER_LATER>:
4919:
4920: The problem is past due, not considered correct, and an answer date in
4921: the future is set.
4922:
4923: =item * B<ANSWER_OPEN>:
4924:
4925: The problem is past due, not correct, and the answer is now available.
4926:
4927: =item * B<OPEN_LATER>:
4928:
4929: The problem is not yet open.
4930:
4931: =item * B<TRIES_LEFT>:
4932:
4933: The problem is open, has been tried, is not correct, but there are
4934: tries left.
4935:
4936: =item * B<INCORRECT>:
4937:
4938: The problem is open, and all tries have been used without getting the
4939: correct answer.
4940:
4941: =item * B<OPEN>:
4942:
4943: The item is open and not yet tried.
4944:
4945: =item * B<ATTEMPTED>:
4946:
4947: The problem has been attempted.
4948:
4949: =item * B<CREDIT_ATTEMPTED>:
4950:
4951: The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
4952:
4953: =item * B<ANSWER_SUBMITTED>:
4954:
4955: An answer has been submitted, but the student should not see it.
4956:
4957: =back
4958:
4959: =cut
4960:
4961: sub TRIES_LEFT { return 20; }
4962: sub ANSWER_SUBMITTED { return 21; }
4963: sub PARTIALLY_CORRECT { return 22; }
4964:
4965: sub RESERVED_LATER { return 30; }
4966: sub RESERVED { return 31; }
4967: sub RESERVED_LOCATION { return 32; }
4968: sub RESERVABLE { return 33; }
4969: sub RESERVABLE_LATER { return 34; }
4970: sub NOTRESERVABLE { return 35; }
4971: sub NOT_IN_A_SLOT { return 36; }
4972: sub NEEDS_CHECKIN { return 37; }
4973: sub WAITING_FOR_GRADE { return 38; }
4974: sub UNKNOWN { return 39; }
4975:
4976: sub status {
4977: my $self = shift;
4978: my $part = shift;
4979: if (!defined($part)) { $part = "0"; }
4980: my $completionStatus = $self->getCompletionStatus($part);
4981: my $dateStatus = $self->getDateStatus($part);
4982:
4983: # What we have is a two-dimensional matrix with 4 entries on one
4984: # dimension and 5 entries on the other, which we want to colorize,
4985: # plus network failure and "no date data at all".
4986:
4987: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4988: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4989:
4990: my $suppressFeedback = 0;
4991: if (($self->problemstatus($part) eq 'no') ||
4992: ($self->problemstatus($part) eq 'no_feedback_ever')) {
4993: $suppressFeedback = 1;
4994: }
4995: # If there's an answer date and we're past it, don't
4996: # suppress the feedback; student should know
4997: if ($self->duedate($part) && $self->duedate($part) < time() &&
4998: $self->answerdate($part) && $self->answerdate($part) < time()) {
4999: $suppressFeedback = 0;
5000: }
5001:
5002: # There are a few whole rows we can dispose of:
5003: if ($completionStatus == CORRECT ||
5004: $completionStatus == CORRECT_BY_OVERRIDE ) {
5005: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
5006: my $awarded=$self->awarded($part);
5007: if ($awarded < 1 && $awarded > 0) {
5008: return PARTIALLY_CORRECT;
5009: } elsif ($awarded<1) {
5010: return INCORRECT;
5011: }
5012: return CORRECT;
5013: }
5014:
5015: # If it's WRONG... and not open
5016: if ( ($completionStatus == INCORRECT ||
5017: $completionStatus == INCORRECT_BY_OVERRIDE)
5018: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
5019: return INCORRECT;
5020: }
5021:
5022: if ($completionStatus == ATTEMPTED) {
5023: return ATTEMPTED;
5024: }
5025:
5026: if ($completionStatus == CREDIT_ATTEMPTED) {
5027: return CREDIT_ATTEMPTED;
5028: }
5029:
5030: # If it's EXCUSED, then return that no matter what
5031: if ($completionStatus == EXCUSED) {
5032: return EXCUSED;
5033: }
5034:
5035: if ($dateStatus == NOTHING_SET) {
5036: return NOTHING_SET;
5037: }
5038:
5039: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
5040: # by 4 matrix (date statuses).
5041:
5042: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
5043: $dateStatus == PAST_DUE_NO_ANSWER ) {
5044: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
5045: }
5046:
5047: if ($dateStatus == ANSWER_OPEN) {
5048: return ANSWER_OPEN;
5049: }
5050:
5051: # Now: (incorrect, incorrect_override, not_attempted) x
5052: # (open_later), (open)
5053:
5054: if ($dateStatus == OPEN_LATER) {
5055: return OPEN_LATER;
5056: }
5057:
5058: # If it's WRONG...
5059: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
5060: # and there are TRIES LEFT:
5061: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5062: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
5063: }
5064: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
5065: }
5066:
5067: # Otherwise, it's untried and open
5068: return OPEN;
5069: }
5070:
5071: sub check_for_slot {
5072: my $self = shift;
5073: my $part = shift;
5074: my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
5075: if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
5076: my @slots = (split(/:/,$availablestudent),split(/:/,$available));
5077: my $cid=$env{'request.course.id'};
5078: my $cdom=$env{'course.'.$cid.'.domain'};
5079: my $cnum=$env{'course.'.$cid.'.num'};
5080: my $now = time;
5081: if (@slots > 0) {
5082: my %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
5083: if (&Apache::lonnet::error(%slots)) {
5084: return (UNKNOWN);
5085: }
5086: my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots);
5087: my ($checkedin,$checkedinslot);
5088: foreach my $slot_name (@sorted_slots) {
5089: next if (!defined($slots{$slot_name}) ||
5090: !ref($slots{$slot_name}));
5091: my $end = $slots{$slot_name}->{'endtime'};
5092: my $start = $slots{$slot_name}->{'starttime'};
5093: my $ip = $slots{$slot_name}->{'ip'};
5094: if ($self->simpleStatus() == OPEN) {
5095: my $startreserve = $slots{$slot_name}->{'startreserve'};
5096: my @proctors;
5097: if ($slots{$slot_name}->{'proctor'} ne '') {
5098: @proctors = split(',',$slots{$slot_name}->{'proctor'});
5099: }
5100: if ($end > $now) {
5101: ($checkedin,$checkedinslot) = $self->checkedin();
5102: if ($startreserve < $now) {
5103: if ($start > $now) {
5104: return (RESERVED_LATER,$start,$slot_name);
5105: } else {
5106: if ($ip ne '') {
5107: if (!&Apache::loncommon::check_ip_acc($ip)) {
5108: return (RESERVED_LOCATION,$ip,$slot_name);
5109: }
5110: }
5111: if (@proctors > 0) {
5112: unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
5113: ($checkedinslot eq $slot_name)) {
5114: return (NEEDS_CHECKIN,undef,$slot_name);
5115: }
5116: }
5117: return (RESERVED,$end,$slot_name);
5118: }
5119: } else {
5120: if ($start > $now) {
5121: return (RESERVABLE,$startreserve,$slot_name);
5122: }
5123: }
5124: }
5125: }
5126: }
5127: my ($is_correct,$got_grade);
5128: if ($self->is_task()) {
5129: my $taskstatus = $self->taskstatus();
5130: $is_correct = (($taskstatus eq 'pass') ||
5131: ($self->solved() =~ /^correct_/));
5132: $got_grade = ($taskstatus =~ /^(?:pass|fail)$/);
5133: } else {
5134: $got_grade = 1;
5135: $is_correct = ($self->solved() =~ /^correct_/);
5136: }
5137: ($checkedin,$checkedinslot) = $self->checkedin();
5138: if ($checkedin) {
5139: if (!$got_grade) {
5140: return (WAITING_FOR_GRADE);
5141: } elsif ($is_correct) {
5142: return (CORRECT);
5143: }
5144: }
5145: return(NOT_IN_A_SLOT);
5146: } else {
5147: if (!$future_slots_checked) {
5148: $future_slots = &get_future_slots($cdom,$cnum,$now);
5149: $future_slots_checked = 1;
5150: }
5151: if ($future_slots) {
5152: return(NOT_IN_A_SLOT);
5153: }
5154: return(NOTRESERVABLE);
5155: }
5156: }
5157: return;
5158: }
5159:
5160: sub get_future_slots {
5161: my ($cdom,$cnum,$now) = @_;
5162: my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
5163: my $future_slots = 0;
5164: foreach my $slot (keys(%slots)) {
5165: if (($slots{$slot}->{'starttime'} > $now) &&
5166: ($slots{$slot}->{'endtime'} > $now)) {
5167: $future_slots ++;
5168: }
5169: }
5170: return $future_slots;
5171: }
5172:
5173: sub CLOSED { return 23; }
5174: sub ERROR { return 24; }
5175:
5176: =pod
5177:
5178: B<Simple Status>
5179:
5180: Convenience method B<simpleStatus> provides a "simple status" for the resource.
5181: "Simple status" corresponds to "which icon is shown on the
5182: Navmaps". There are six "simple" statuses:
5183:
5184: =over 4
5185:
5186: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
5187:
5188: =item * B<OPEN>: The problem is open and unattempted.
5189:
5190: =item * B<CORRECT>: The problem is correct for any reason.
5191:
5192: =item * B<INCORRECT>: The problem is incorrect and can still be
5193: completed successfully.
5194:
5195: =item * B<ATTEMPTED>: The problem has been attempted, but the student
5196: does not know if they are correct. (The ellipsis icon.)
5197:
5198: =item * B<ERROR>: There is an error retrieving information about this
5199: problem.
5200:
5201: =back
5202:
5203: =cut
5204:
5205: # This hash maps the composite status to this simple status, and
5206: # can be used directly, if you like
5207: my %compositeToSimple =
5208: (
5209: NETWORK_FAILURE() => ERROR,
5210: NOTHING_SET() => CLOSED,
5211: CORRECT() => CORRECT,
5212: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
5213: EXCUSED() => CORRECT,
5214: PAST_DUE_NO_ANSWER() => INCORRECT,
5215: PAST_DUE_ANSWER_LATER() => INCORRECT,
5216: ANSWER_OPEN() => INCORRECT,
5217: OPEN_LATER() => CLOSED,
5218: TRIES_LEFT() => OPEN,
5219: INCORRECT() => INCORRECT,
5220: OPEN() => OPEN,
5221: ATTEMPTED() => ATTEMPTED,
5222: CREDIT_ATTEMPTED() => CORRECT,
5223: ANSWER_SUBMITTED() => ATTEMPTED
5224: );
5225:
5226: sub simpleStatus {
5227: my $self = shift;
5228: my $part = shift;
5229: my $status = $self->status($part);
5230: return $compositeToSimple{$status};
5231: }
5232:
5233: =pod
5234:
5235: B<simpleStatusCount> will return an array reference containing, in
5236: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
5237: and ERROR parts the given problem has.
5238:
5239: =cut
5240:
5241: # This maps the status to the slot we want to increment
5242: my %statusToSlotMap =
5243: (
5244: OPEN() => 0,
5245: CLOSED() => 1,
5246: CORRECT() => 2,
5247: INCORRECT() => 3,
5248: ATTEMPTED() => 4,
5249: ERROR() => 5
5250: );
5251:
5252: sub statusToSlot { return $statusToSlotMap{shift()}; }
5253:
5254: sub simpleStatusCount {
5255: my $self = shift;
5256:
5257: my @counts = (0, 0, 0, 0, 0, 0, 0);
5258: foreach my $part (@{$self->parts()}) {
5259: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
5260: }
5261:
5262: return \@counts;
5263: }
5264:
5265: =pod
5266:
5267: B<Completable>
5268:
5269: The completable method represents the concept of I<whether the student can
5270: currently do the problem>. If the student can do the problem, which means
5271: that it is open, there are tries left, and if the problem is manually graded
5272: or the grade is suppressed via problemstatus, the student has not tried it
5273: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
5274: either the student has tried it and there is no feedback, or that for
5275: some reason it is no longer completable (not open yet, successfully completed,
5276: out of tries, etc.). As an example, this is used as the filter for the
5277: "Uncompleted Homework" option for the nav maps.
5278:
5279: If this does not quite meet your needs, do not fiddle with it (unless you are
5280: fixing it to better match the student's conception of "completable" because
5281: it's broken somehow)... make a new method.
5282:
5283: =cut
5284:
5285: sub completable {
5286: my $self = shift;
5287: if (!$self->is_problem()) { return 0; }
5288: my $partCount = $self->countParts();
5289:
5290: foreach my $part (@{$self->parts()}) {
5291: if ($part eq '0' && $partCount != 1) { next; }
5292: my $status = $self->status($part);
5293: # "If any of the parts are open, or have tries left (implies open),
5294: # and it is not "attempted" (manually graded problem), it is
5295: # not "complete"
5296: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5297: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5298: $status == ANSWER_SUBMITTED() ) {
5299: # did this part already, as well as we can
5300: next;
5301: }
5302: if ($status == OPEN() || $status == TRIES_LEFT()) {
5303: return 1;
5304: }
5305: }
5306:
5307: # If all the parts were complete, so was this problem.
5308: return 0;
5309: }
5310:
5311: =pod
5312:
5313: =head2 Resource/Nav Map Navigation
5314:
5315: =over 4
5316:
5317: =item * B<getNext>():
5318:
5319: Retreive an array of the possible next resources after this
5320: one. Always returns an array, even in the one- or zero-element case.
5321:
5322: =item * B<getPrevious>():
5323:
5324: Retreive an array of the possible previous resources from this
5325: one. Always returns an array, even in the one- or zero-element case.
5326:
5327: =cut
5328:
5329: sub getNext {
5330: my $self = shift;
5331: my @branches;
5332: my $to = $self->to();
5333: foreach my $branch ( split(/,/, $to) ) {
5334: my $choice = $self->{NAV_MAP}->getById($branch);
5335: #if (!$choice->condition()) { next; }
5336: my $next = $choice->goesto();
5337: $next = $self->{NAV_MAP}->getById($next);
5338:
5339: push @branches, $next;
5340: }
5341: return \@branches;
5342: }
5343:
5344: sub getPrevious {
5345: my $self = shift;
5346: my @branches;
5347: my $from = $self->from();
5348: foreach my $branch ( split /,/, $from) {
5349: my $choice = $self->{NAV_MAP}->getById($branch);
5350: my $prev = $choice->comesfrom();
5351: $prev = $self->{NAV_MAP}->getById($prev);
5352:
5353: push @branches, $prev;
5354: }
5355: return \@branches;
5356: }
5357:
5358: sub browsePriv {
5359: my $self = shift;
5360: if (defined($self->{BROWSE_PRIV})) {
5361: return $self->{BROWSE_PRIV};
5362: }
5363:
5364: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
5365: $self->symb());
5366: }
5367:
5368: =pod
5369:
5370: =back
5371:
5372: =cut
5373:
5374: 1;
5375:
5376: __END__
5377:
5378:
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