File:
[LON-CAPA] /
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lonnavmaps.pm
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1.474:
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Wed Dec 21 16:53:03 2011 UTC (12 years, 5 months ago) by
raeburn
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MAIN
CVS tags:
HEAD
- Wording change for reservable slots.
- Delay determination of proctors until needed.
- Iteration direction for ordered arrays of slots with reservations was the
wrong way round.
- currently reservable - find reservable slot with latest closing time for
reservation window.
- reservable inf future - find reservable slot with earliest opeing time for
reservation window.
1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.474 2011/12/21 16:53:03 raeburn Exp $
5:
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: ###
30:
31: =pod
32:
33: =head1 NAME
34:
35: Apache::lonnavmaps - Subroutines to handle and render the navigation
36:
37: =head1 SYNOPSIS
38:
39: Handles navigational maps.
40:
41: The main handler generates the navigational listing for the course,
42: the other objects export this information in a usable fashion for
43: other modules.
44:
45:
46: This is part of the LearningOnline Network with CAPA project
47: described at http://www.lon-capa.org.
48:
49:
50: =head1 OVERVIEW
51:
52: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
53: course structure and caches it in what is often referred to as the
54: "big hash" X<big hash>. You can see it if you are logged into
55: LON-CAPA, in a course, by going to /adm/test. (You may need to
56: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
57: content of the hash will be under the heading "Big Hash".
58:
59: Big Hash contains, among other things, how resources are related
60: to each other (next/previous), what resources are maps, which
61: resources are being chosen to not show to the student (for random
62: selection), and a lot of other things that can take a lot of time
63: to compute due to the amount of data that needs to be collected and
64: processed.
65:
66: Apache::lonnavmaps provides an object model for manipulating this
67: information in a higher-level fashion than directly manipulating
68: the hash. It also provides access to several auxilary functions
69: that aren't necessarily stored in the Big Hash, but are a per-
70: resource sort of value, like whether there is any feedback on
71: a given resource.
72:
73: Apache::lonnavmaps also abstracts away branching, and someday,
74: conditions, for the times where you don't really care about those
75: things.
76:
77: Apache::lonnavmaps also provides fairly powerful routines for
78: rendering navmaps, and last but not least, provides the navmaps
79: view for when the user clicks the NAV button.
80:
81: B<Note>: Apache::lonnavmaps I<only> works for the "currently
82: logged in user"; if you want things like "due dates for another
83: student" lonnavmaps can not directly retrieve information like
84: that. You need the EXT function. This module can still help,
85: because many things, such as the course structure, are constant
86: between users, and Apache::lonnavmaps can help by providing
87: symbs for the EXT call.
88:
89: The rest of this file will cover the provided rendering routines,
90: which can often be used without fiddling with the navmap object at
91: all, then documents the Apache::lonnavmaps::navmap object, which
92: is the key to accessing the Big Hash information, covers the use
93: of the Iterator (which provides the logic for traversing the
94: somewhat-complicated Big Hash data structure), documents the
95: Apache::lonnavmaps::Resource objects that are returned by
96:
97: =head1 Subroutine: render
98:
99: The navmap renderer package provides a sophisticated rendering of the
100: standard navigation maps interface into HTML. The provided nav map
101: handler is actually just a glorified call to this.
102:
103: Because of the large number of parameters this function accepts,
104: instead of passing it arguments as is normal, pass it in an anonymous
105: hash with the desired options.
106:
107: The package provides a function called 'render', called as
108: Apache::lonnavmaps::render({}).
109:
110: =head2 Overview of Columns
111:
112: The renderer will build an HTML table for the navmap and return
113: it. The table consists of several columns, and a row for each
114: resource (or possibly each part). You tell the renderer how many
115: columns to create and what to place in each column, optionally using
116: one or more of the prepared columns, and the renderer will assemble
117: the table.
118:
119: Any additional generally useful column types should be placed in the
120: renderer code here, so anybody can use it anywhere else. Any code
121: specific to the current application (such as the addition of <input>
122: elements in a column) should be placed in the code of the thing using
123: the renderer.
124:
125: At the core of the renderer is the array reference COLS (see Example
126: section below for how to pass this correctly). The COLS array will
127: consist of entries of one of two types of things: Either an integer
128: representing one of the pre-packaged column types, or a sub reference
129: that takes a resource reference, a part number, and a reference to the
130: argument hash passed to the renderer, and returns a string that will
131: be inserted into the HTML representation as it.
132:
133: All other parameters are ways of either changing how the columns
134: are printing, or which rows are shown.
135:
136: The pre-packaged column names are refered to by constants in the
137: Apache::lonnavmaps namespace. The following currently exist:
138:
139: =over 4
140:
141: =item * B<Apache::lonnavmaps::resource>:
142:
143: The general info about the resource: Link, icon for the type, etc. The
144: first column in the standard nav map display. This column provides the
145: indentation effect seen in the B<NAV> screen. This column also accepts
146: the following parameters in the renderer hash:
147:
148: =over 4
149:
150: =item * B<resource_nolink>: default false
151:
152: If true, the resource will not be linked. By default, all non-folder
153: resources are linked.
154:
155: =item * B<resource_part_count>: default true
156:
157: If true, the resource will show a part count B<if> the full
158: part list is not displayed. (See "condense_parts" later.) If false,
159: the resource will never show a part count.
160:
161: =item * B<resource_no_folder_link>:
162:
163: If true, the resource's folder will not be clickable to open or close
164: it. Default is false. True implies printCloseAll is false, since you
165: can't close or open folders when this is on anyhow.
166:
167: =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: sub addToFilter {
546: my $hashIn = shift;
547: my $addition = shift;
548: my %hash = %$hashIn;
549: $hash{$addition} = 1;
550:
551: return join (",", keys(%hash));
552: }
553:
554: sub removeFromFilter {
555: my $hashIn = shift;
556: my $subtraction = shift;
557: my %hash = %$hashIn;
558:
559: delete $hash{$subtraction};
560: return join(",", keys(%hash));
561: }
562:
563: sub getLinkForResource {
564: my $stack = shift;
565: my $res;
566:
567: # Check to see if there are any pages in the stack
568: foreach $res (@$stack) {
569: if (defined($res)) {
570: my $anchor;
571: if ($res->is_page()) {
572: foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; } }
573: $anchor=&escape($anchor->shown_symb());
574: return ($res->link(),$res->shown_symb(),$anchor);
575: }
576: # in case folder was skipped over as "only sequence"
577: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
578: if ($map=~/\.page$/) {
579: my $url=&Apache::lonnet::clutter($map);
580: $anchor=&escape($res->shown_symb());
581: return ($url,$res->shown_symb(),$anchor);
582: }
583: }
584: }
585:
586: # Failing that, return the src of the last resource that is defined
587: # (when we first recurse on a map, it puts an undefined resource
588: # on the bottom because $self->{HERE} isn't defined yet, and we
589: # want the src for the map anyhow)
590: foreach my $item (@$stack) {
591: if (defined($item)) { $res = $item; }
592: }
593:
594: if ($res) {
595: return ($res->link(),$res->shown_symb());
596: }
597: return;
598: }
599:
600:
601:
602: sub getDescription {
603: my $res = shift;
604: my $part = shift;
605: my $status = $res->status($part);
606:
607: my $open = $res->opendate($part);
608: my $due = $res->duedate($part);
609: my $answer = $res->answerdate($part);
610:
611: if ($status == $res->NETWORK_FAILURE) {
612: return &mt("Having technical difficulties; please check status later");
613: }
614: if ($status == $res->NOTHING_SET) {
615: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Not currently assigned.",$res->symb(),'opendate'),$part);
616: }
617: if ($status == $res->OPEN_LATER) {
618: return &mt("Open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($open,'start'),$res->symb(),'opendate',$part));
619: }
620: if ($res->simpleStatus($part) == $res->OPEN) {
621: unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
622: my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
623: if ($slot_status == $res->UNKNOWN) {
624: return &mt('Reservation status unknown');
625: } elsif ($slot_status == $res->RESERVED) {
626: return &mt('Reserved - ends [_1]',
627: timeToHumanString($slot_time,'end'));
628: } elsif ($slot_status == $res->RESERVED_LOCATION) {
629: return &mt('Reserved - specific location(s) - ends [_1]',
630: timeToHumanString($slot_time,'end'));
631: } elsif ($slot_status == $res->RESERVED_LATER) {
632: return &mt('Reserved - next open [_1]',
633: timeToHumanString($slot_time,'start'));
634: } elsif ($slot_status == $res->RESERVABLE) {
635: return &mt('Reservable, reservations close [_1]',
636: timeToHumanString($slot_time,'end'));
637: } elsif ($slot_status == $res->RESERVABLE_LATER) {
638: return &mt('Reservable, reservations open [_1]',
639: timeToHumanString($slot_time,'start'));
640: } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
641: return &mt('Reserve a time/place to work');
642: } elsif ($slot_status == $res->NOTRESERVABLE) {
643: return &mt('Reservation not available');
644: } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
645: return &mt('Submission in grading queue');
646: }
647: }
648: }
649: if ($status == $res->OPEN) {
650: if ($due) {
651: if ($res->is_practice()) {
652: return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'duedate',$part));
653: } else {
654: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part));
655: }
656: } else {
657: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part);
658: }
659: }
660: if ($status == $res->PAST_DUE_ANSWER_LATER) {
661: return &mt("Answer open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($answer,'start'),$res->symb(),'answerdate',$part));
662: }
663: if ($status == $res->PAST_DUE_NO_ANSWER) {
664: if ($res->is_practice()) {
665: return &mt("Closed [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'answerdate,duedate',$part));
666: } else {
667: return &mt("Was due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'answerdate,duedate',$part));
668: }
669: }
670: if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
671: && $res->handgrade($part) ne 'yes') {
672: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Answer available"),$res->symb(),'answerdate,duedate',$part);
673: }
674: if ($status == $res->EXCUSED) {
675: return &mt("Excused by instructor");
676: }
677: if ($status == $res->ATTEMPTED) {
678: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
679: return &mt("Survey submission recorded");
680: } else {
681: return &mt("Answer submitted, not yet graded");
682: }
683: }
684: if ($status == $res->CREDIT_ATTEMPTED) {
685: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
686: return &mt("Credit for survey submission");
687: }
688: }
689: if ($status == $res->TRIES_LEFT) {
690: my $tries = $res->tries($part);
691: my $maxtries = $res->maxtries($part);
692: my $triesString = "";
693: if ($tries && $maxtries) {
694: $triesString = '<font size="-1"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></font>';
695: if ($maxtries > 1 && $maxtries - $tries == 1) {
696: $triesString = "<b>$triesString</b>";
697: }
698: }
699: if ($due) {
700: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)) .
701: " $triesString";
702: } else {
703: return &Apache::lonhtmlcommon::direct_parm_link(&mt("No due date"),$res->symb(),'duedate',$part)." $triesString";
704: }
705: }
706: if ($status == $res->ANSWER_SUBMITTED) {
707: return &mt('Answer submitted');
708: }
709: }
710:
711:
712: sub dueInLessThan24Hours {
713: my $res = shift;
714: my $part = shift;
715: my $status = $res->status($part);
716:
717: return ($status == $res->OPEN() ||
718: $status == $res->TRIES_LEFT()) &&
719: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
720: $res->duedate($part) > time();
721: }
722:
723:
724: sub lastTry {
725: my $res = shift;
726: my $part = shift;
727:
728: my $tries = $res->tries($part);
729: my $maxtries = $res->maxtries($part);
730: return $tries && $maxtries && $maxtries > 1 &&
731: $maxtries - $tries == 1 && $res->duedate($part) &&
732: $res->duedate($part) > time();
733: }
734:
735:
736: sub advancedUser {
737: return $env{'request.role.adv'};
738: }
739:
740: sub timeToHumanString {
741: my ($time,$type,$format) = @_;
742:
743: # zero, '0' and blank are bad times
744: if (!$time) {
745: return &mt('never');
746: }
747: unless (&Apache::lonlocal::current_language()=~/^en/) {
748: return &Apache::lonlocal::locallocaltime($time);
749: }
750: my $now = time();
751:
752: # Positive = future
753: my $delta = $time - $now;
754:
755: my $minute = 60;
756: my $hour = 60 * $minute;
757: my $day = 24 * $hour;
758: my $week = 7 * $day;
759: my $inPast = 0;
760:
761: # Logic in comments:
762: # Is it now? (extremely unlikely)
763: if ( $delta == 0 ) {
764: return "this instant";
765: }
766:
767: if ($delta < 0) {
768: $inPast = 1;
769: $delta = -$delta;
770: }
771:
772: if ( $delta > 0 ) {
773:
774: my $tense = $inPast ? " ago" : "";
775: my $prefix = $inPast ? "" : "in ";
776:
777: # Less than a minute
778: if ( $delta < $minute ) {
779: if ($delta == 1) { return "${prefix}1 second$tense"; }
780: return "$prefix$delta seconds$tense";
781: }
782:
783: # Less than an hour
784: if ( $delta < $hour ) {
785: # If so, use minutes; or minutes, seconds (if format requires)
786: my $minutes = floor($delta / 60);
787: if (($format ne '') && ($format =~ /\%(T|S)/)) {
788: my $display;
789: if ($minutes == 1) {
790: $display = "${prefix}1 minute";
791: } else {
792: $display = "$prefix$minutes minutes";
793: }
794: my $seconds = $delta % $minute;
795: if ($seconds == 0) {
796: $display .= $tense;
797: } elsif ($seconds == 1) {
798: $display .= ", 1 second$tense";
799: } else {
800: $display .= ", $seconds seconds$tense";
801: }
802: return $display;
803: }
804: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
805: return "$prefix$minutes minutes$tense";
806: }
807:
808: # Is it less than 24 hours away? If so,
809: # display hours + minutes, (and + seconds, if format specified it)
810: if ( $delta < $hour * 24) {
811: my $hours = floor($delta / $hour);
812: my $minutes = floor(($delta % $hour) / $minute);
813: my $hourString = "$hours hours";
814: my $minuteString = ", $minutes minutes";
815: if ($hours == 1) {
816: $hourString = "1 hour";
817: }
818: if ($minutes == 1) {
819: $minuteString = ", 1 minute";
820: }
821: if ($minutes == 0) {
822: $minuteString = "";
823: }
824: if (($format ne '') && ($format =~ /\%(T|S)/)) {
825: my $display = "$prefix$hourString$minuteString";
826: my $seconds = $delta-(($hours * $hour)+($minutes * $minute));
827: if ($seconds == 0) {
828: $display .= $tense;
829: } elsif ($seconds == 1) {
830: $display .= ", 1 second$tense";
831: } else {
832: $display .= ", $seconds seconds$tense";
833: }
834: return $display;
835: }
836: return "$prefix$hourString$minuteString$tense";
837: }
838:
839: # Date/time is more than 24 hours away
840:
841: my $dt = DateTime->from_epoch(epoch => $time)
842: ->set_time_zone(&Apache::lonlocal::gettimezone());
843:
844: # If there's a caller supplied format, use it, unless it only displays
845: # H:M:S or H:M.
846:
847: if (($format ne '') && ($format ne '%T') && ($format ne '%R')) {
848: my $timeStr = $dt->strftime($format);
849: return $timeStr.' ('.$dt->time_zone_short_name().')';
850: }
851:
852: # Less than 5 days away, display day of the week and
853: # HH:MM
854:
855: if ( $delta < $day * 5 ) {
856: my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
857: $timeStr =~ s/12:00 am/00:00/;
858: $timeStr =~ s/12:00 pm/noon/;
859: return ($inPast ? "last " : "this ") .
860: $timeStr;
861: }
862:
863: my $conjunction='on';
864: if ($type eq 'start') {
865: $conjunction='at';
866: } elsif ($type eq 'end') {
867: $conjunction='by';
868: }
869: # Is it this year?
870: my $dt_now = DateTime->from_epoch(epoch => $now)
871: ->set_time_zone(&Apache::lonlocal::gettimezone());
872: if ( $dt->year() == $dt_now->year()) {
873: # Return on Month Day, HH:MM meridian
874: my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
875: $timeStr =~ s/12:00 am/00:00/;
876: $timeStr =~ s/12:00 pm/noon/;
877: return $timeStr;
878: }
879:
880: # Not this year, so show the year
881: my $timeStr =
882: $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
883: $timeStr =~ s/12:00 am/00:00/;
884: $timeStr =~ s/12:00 pm/noon/;
885: return $timeStr;
886: }
887: }
888:
889:
890: sub resource { return 0; }
891: sub communication_status { return 1; }
892: sub quick_status { return 2; }
893: sub long_status { return 3; }
894: sub part_status_summary { return 4; }
895:
896: sub render_resource {
897: my ($resource, $part, $params) = @_;
898:
899: my $nonLinkedText = ''; # stuff after resource title not in link
900:
901: my $link = $params->{"resourceLink"};
902:
903: # The URL part is not escaped at this point, but the symb is...
904:
905: my $src = $resource->src();
906: my $it = $params->{"iterator"};
907: my $filter = $it->{FILTER};
908:
909: my $title = $resource->compTitle();
910:
911: my $partLabel = "";
912: my $newBranchText = "";
913: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
914: # If this is a new branch, label it so
915: if ($params->{'isNewBranch'}) {
916: $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
917: }
918:
919: # links to open and close the folder
920:
921: my $whitespace = $location.'/whitespace_21.gif';
922: my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
923: my $linkclose = "</a>";
924:
925: # Default icon: unknown page
926: my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
927:
928: if ($resource->is_problem()) {
929: if ($part eq '0' || $params->{'condensed'}) {
930: $icon = '<img class="LC_contentImage" src="'.$location.'/';
931: if ($resource->is_task()) {
932: $icon .= 'task.gif" alt="'.&mt('Task');
933: } else {
934: $icon .= 'problem.gif" alt="'.&mt('Problem');
935: }
936: $icon .='" />';
937: } else {
938: $icon = $params->{'indentString'};
939: }
940: } else {
941: $icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
942: }
943:
944: # Display the correct map icon to open or shut map
945: if ($resource->is_map()) {
946: my $mapId = $resource->map_pc();
947: my $nowOpen = !defined($filter->{$mapId});
948: if ($it->{CONDITION}) {
949: $nowOpen = !$nowOpen;
950: }
951:
952: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
953: my $title=$resource->title;
954: $title=~s/\"/\&qout;/g;
955: if (!$params->{'resource_no_folder_link'}) {
956: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
957: $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
958: ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
959: .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
960: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
961: $params->{'queryString'} . '&filter=';
962: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
963: addToFilter($filter, $mapId) :
964: removeFromFilter($filter, $mapId);
965: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
966: . $params->{'hereType'} . '&here=' .
967: &escape($params->{'here'}) .
968: '&jump=' .
969: &escape($resource->symb()) .
970: "&folderManip=1\">";
971:
972: } else {
973: # Don't allow users to manipulate folder
974: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
975: $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
976:
977: $linkopen = "";
978: $linkclose = "";
979: }
980: }
981:
982: if ($resource->randomout()) {
983: $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
984: }
985: if (!$resource->condval()) {
986: $nonLinkedText .= ' <span class="LC_info">('.&mt('conditionally hidden').')</span> ';
987: }
988: if (($resource->is_practice()) && ($resource->is_raw_problem())) {
989: $nonLinkedText .=' <font color="green"><b>'.&mt('not graded').'</b></font>';
990: }
991:
992: # We're done preparing and finally ready to start the rendering
993: my $result = '<td class="LC_middle">';
994: my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
995:
996: my $indentLevel = $params->{'indentLevel'};
997: if ($newBranchText) { $indentLevel--; }
998:
999: # print indentation
1000: for (my $i = 0; $i < $indentLevel; $i++) {
1001: $result .= $params->{'indentString'};
1002: }
1003:
1004: # Decide what to display
1005: $result .= "$newBranchText$linkopen$icon$linkclose";
1006:
1007: my $curMarkerBegin = '';
1008: my $curMarkerEnd = '';
1009:
1010: # Is this the current resource?
1011: if (!$params->{'displayedHereMarker'} &&
1012: $resource->symb() eq $params->{'here'} ) {
1013: $curMarkerBegin = '<span class="LC_current_nav_location">';
1014: $curMarkerEnd = '</span>';
1015: $params->{'displayedHereMarker'} = 1;
1016: }
1017:
1018: if ($resource->is_problem() && $part ne '0' &&
1019: !$params->{'condensed'}) {
1020: my $displaypart=$resource->part_display($part);
1021: $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1022: if ($link!~/\#/) { $link.='#'.&escape($part); }
1023: $title = "";
1024: }
1025:
1026: if ($params->{'condensed'} && $resource->countParts() > 1) {
1027: $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1028: }
1029:
1030: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1031: $result .= "$curMarkerBegin<a href=\"$link\">$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1032: } else {
1033: $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1034: }
1035:
1036: return $result;
1037: }
1038:
1039: sub render_communication_status {
1040: my ($resource, $part, $params) = @_;
1041: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1042:
1043: my $link = $params->{"resourceLink"};
1044: my $linkopen = "<a href=\"$link\">";
1045: my $linkclose = "</a>";
1046: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1047: if ($resource->hasDiscussion()) {
1048: $discussionHTML = $linkopen .
1049: '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" title="'.&mt('New Discussion').'"/>' .
1050: $linkclose;
1051: }
1052:
1053: if ($resource->getFeedback()) {
1054: my $feedback = $resource->getFeedback();
1055: foreach my $msgid (split(/\,/, $feedback)) {
1056: if ($msgid) {
1057: $feedbackHTML .= ' <a href="/adm/email?display='
1058: . &escape($msgid) . '">'
1059: . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" title="'.&mt('New E-mail').'"/></a>';
1060: }
1061: }
1062: }
1063:
1064: if ($resource->getErrors()) {
1065: my $errors = $resource->getErrors();
1066: my $errorcount = 0;
1067: foreach my $msgid (split(/,/, $errors)) {
1068: last if ($errorcount>=10); # Only output 10 bombs maximum
1069: if ($msgid) {
1070: $errorcount++;
1071: $errorHTML .= ' <a href="/adm/email?display='
1072: . &escape($msgid) . '">'
1073: . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" title="'.&mt('New Error').'"/></a>';
1074: }
1075: }
1076: }
1077:
1078: if ($params->{'multipart'} && $part != '0') {
1079: $discussionHTML = $feedbackHTML = $errorHTML = '';
1080: }
1081: return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML </td>";
1082:
1083: }
1084: sub render_quick_status {
1085: my ($resource, $part, $params) = @_;
1086: my $result = "";
1087: my $firstDisplayed = !$params->{'condensed'} &&
1088: $params->{'multipart'} && $part eq "0";
1089:
1090: my $link = $params->{"resourceLink"};
1091: my $linkopen = "<a href=\"$link\">";
1092: my $linkclose = "</a>";
1093:
1094: $result .= '<td class="LC_middle">';
1095: if ($resource->is_problem() &&
1096: !$firstDisplayed) {
1097: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1098: my $alt = $iconAltTags{$icon};
1099: if ($icon) {
1100: my $location=
1101: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1102: $result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;
1103: } else {
1104: $result .= " ";
1105: }
1106: } else { # not problem, no icon
1107: $result .= " ";
1108: }
1109: $result .= "</td>\n";
1110: return $result;
1111: }
1112: sub render_long_status {
1113: my ($resource, $part, $params) = @_;
1114: my $result = '<td class="LC_middle LC_right">';
1115: my $firstDisplayed = !$params->{'condensed'} &&
1116: $params->{'multipart'} && $part eq "0";
1117:
1118: my $color;
1119: if ($resource->is_problem() || $resource->is_practice()) {
1120: $color = $colormap{$resource->status};
1121:
1122: if (dueInLessThan24Hours($resource, $part) ||
1123: lastTry($resource, $part)) {
1124: $color = $hurryUpColor;
1125: }
1126: }
1127:
1128: if ($resource->kind() eq "res" &&
1129: $resource->is_raw_problem() &&
1130: !$firstDisplayed) {
1131: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1132: $result .= getDescription($resource, $part);
1133: if ($color) {$result .= "</b></font>"; }
1134: }
1135: if ($resource->is_map()) {
1136: if (&Apache::lonnet::allowed('mdc')) {
1137: if ($resource->symb=~/\_\_\_[^\_]+\_\_\_uploaded/) {
1138: $result.=" <a href='/adm/coursedocs?command=direct&symb=".&escape($resource->symb())."'>".
1139: "<span class='LC_setting'>".&mt("Edit Content").'</span></a> ';
1140: }
1141: }
1142: }
1143: if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1144: $result .= &mt('(randomly select [_1])', $resource->randompick());
1145: }
1146: if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
1147: $result .= &mt('(randomly ordered)');
1148: }
1149:
1150: # Debugging code
1151: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1152: # ' - Part: ' . $part;
1153:
1154: $result .= "</td>\n";
1155:
1156: return $result;
1157: }
1158:
1159: # Colors obtained by taking the icons, matching the colors, and
1160: # possibly reducing the Value (HSV) of the color, if it's too bright
1161: # for text, generally by one third or so.
1162: my %statusColors =
1163: (
1164: $resObj->CLOSED => '#000000',
1165: $resObj->OPEN => '#998b13',
1166: $resObj->CORRECT => '#26933f',
1167: $resObj->INCORRECT => '#c48207',
1168: $resObj->ATTEMPTED => '#a87510',
1169: $resObj->ERROR => '#000000'
1170: );
1171: my %statusStrings =
1172: (
1173: $resObj->CLOSED => 'Not yet open',
1174: $resObj->OPEN => 'Open',
1175: $resObj->CORRECT => 'Correct',
1176: $resObj->INCORRECT => 'Incorrect',
1177: $resObj->ATTEMPTED => 'Attempted',
1178: $resObj->ERROR => 'Network Error'
1179: );
1180: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1181:
1182: sub render_parts_summary_status {
1183: my ($resource, $part, $params) = @_;
1184: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1185: if ($params->{showParts}) {
1186: return '<td></td>';
1187: }
1188:
1189: my $td = "<td align='right'>\n";
1190: my $endtd = "</td>\n";
1191: my @probs;
1192:
1193: if ($resource->contains_problem) {
1194: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1195: } else {
1196: @probs=($resource);
1197: }
1198: my $return;
1199: my %overallstatus;
1200: my $totalParts;
1201: foreach my $resource (@probs) {
1202: # If there is a single part, just show the simple status
1203: if ($resource->singlepart()) {
1204: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1205: $overallstatus{$status}++;
1206: $totalParts++;
1207: next;
1208: }
1209: # Now we can be sure the $part doesn't really matter.
1210: my $statusCount = $resource->simpleStatusCount();
1211: my @counts;
1212: foreach my $status (@statuses) {
1213: # decouple display order from the simpleStatusCount order
1214: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1215: if ($statusCount->[$slot]) {
1216: $overallstatus{$status}+=$statusCount->[$slot];
1217: $totalParts+=$statusCount->[$slot];
1218: }
1219: }
1220: }
1221: $return.= $td . $totalParts . ' parts: ';
1222: foreach my $status (@statuses) {
1223: if ($overallstatus{$status}) {
1224: $return.="<font color='" . $statusColors{$status} .
1225: "'>" . $overallstatus{$status} . ' '
1226: . $statusStrings{$status} . "</font>";
1227: }
1228: }
1229: $return.= $endtd;
1230: return $return;
1231: }
1232:
1233: my @preparedColumns = (\&render_resource, \&render_communication_status,
1234: \&render_quick_status, \&render_long_status,
1235: \&render_parts_summary_status);
1236:
1237: sub setDefault {
1238: my ($val, $default) = @_;
1239: if (!defined($val)) { return $default; }
1240: return $val;
1241: }
1242:
1243: sub cmp_title {
1244: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1245: $atitle=~s/^\s*//;
1246: $btitle=~s/^\s*//;
1247: return $atitle cmp $btitle;
1248: }
1249:
1250: sub render {
1251: my $args = shift;
1252: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1253: my $result = '';
1254: # Configure the renderer.
1255: my $cols = $args->{'cols'};
1256: if (!defined($cols)) {
1257: # no columns, no nav maps.
1258: return '';
1259: }
1260: my $navmap;
1261: if (defined($args->{'navmap'})) {
1262: $navmap = $args->{'navmap'};
1263: }
1264:
1265: my $r = $args->{'r'};
1266: my $queryString = $args->{'queryString'};
1267: my $jump = $args->{'jump'};
1268: my $here = $args->{'here'};
1269: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1270: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1271: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1272: # before the current resource when using #current
1273:
1274: # If we were passed 'here' information, we are not rendering
1275: # after a folder manipulation, and we were not passed an
1276: # iterator, make sure we open the folders to show the "here"
1277: # marker
1278: my $filterHash = {};
1279: # Figure out what we're not displaying
1280: foreach my $item (split(/\,/, $env{"form.filter"})) {
1281: if ($item) {
1282: $filterHash->{$item} = "1";
1283: }
1284: }
1285:
1286: # Filter: Remember filter function and add our own filter: Refuse
1287: # to show hidden resources unless the user can see them.
1288: my $userCanSeeHidden = advancedUser();
1289: my $filterFunc = setDefault($args->{'filterFunc'},
1290: sub {return 1;});
1291: if (!$userCanSeeHidden) {
1292: # Without renaming the filterfunc, the server seems to go into
1293: # an infinite loop
1294: my $oldFilterFunc = $filterFunc;
1295: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1296: &$oldFilterFunc($res);};
1297: }
1298:
1299: my $condition = 0;
1300: if ($env{'form.condition'}) {
1301: $condition = 1;
1302: }
1303:
1304: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1305: # Step 1: Check to see if we have a navmap
1306: if (!defined($navmap)) {
1307: $navmap = Apache::lonnavmaps::navmap->new();
1308: if (!defined($navmap)) {
1309: # no longer in course
1310: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1311: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1312: }
1313: }
1314:
1315: # Step two: Locate what kind of here marker is necessary
1316: # Determine where the "here" marker is and where the screen jumps to.
1317:
1318: if ($env{'form.postsymb'} ne '') {
1319: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1320: } elsif ($env{'form.postdata'} ne '') {
1321: # couldn't find a symb, is there a URL?
1322: my $currenturl = $env{'form.postdata'};
1323: #$currenturl=~s/^http\:\/\///;
1324: #$currenturl=~s/^[^\/]+//;
1325:
1326: $here = $jump = &Apache::lonnet::symbread($currenturl);
1327: }
1328: if ($here eq '') {
1329: my $last;
1330: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1331: &GDBM_READER(),0640)) {
1332: $last=$hash{'last_known'};
1333: untie(%hash);
1334: }
1335: if ($last) { $here = $jump = $last; }
1336: }
1337:
1338: # Step three: Ensure the folders are open
1339: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1340: my $curRes;
1341: my $found = 0;
1342:
1343: # We only need to do this if we need to open the maps to show the
1344: # current position. This will change the counter so we can't count
1345: # for the jump marker with this loop.
1346: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1347: if (ref($curRes) && $curRes->symb() eq $here) {
1348: my $mapStack = $mapIterator->getStack();
1349:
1350: # Ensure the parent maps are open
1351: for my $map (@{$mapStack}) {
1352: if ($condition) {
1353: undef $filterHash->{$map->map_pc()};
1354: } else {
1355: $filterHash->{$map->map_pc()} = 1;
1356: }
1357: }
1358: $found = 1;
1359: }
1360: }
1361: }
1362:
1363: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1364: # If this is a click on a folder or something, we want to preserve the "here"
1365: # from the querystring, and get the new "jump" marker
1366: $here = $env{'form.here'};
1367: $jump = $env{'form.jump'};
1368: }
1369:
1370: my $it = $args->{'iterator'};
1371: if (!defined($it)) {
1372: # Construct a default iterator based on $env{'form.'} information
1373:
1374: # Step 1: Check to see if we have a navmap
1375: if (!defined($navmap)) {
1376: $navmap = Apache::lonnavmaps::navmap->new();
1377: if (!defined($navmap)) {
1378: # no longer in course
1379: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1380: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1381: }
1382: }
1383:
1384: # See if we're being passed a specific map
1385: if ($args->{'iterator_map'}) {
1386: my $map = $args->{'iterator_map'};
1387: $map = $navmap->getResourceByUrl($map);
1388: my $firstResource = $map->map_start();
1389: my $finishResource = $map->map_finish();
1390:
1391: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1392: } else {
1393: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1394: }
1395: }
1396:
1397:
1398: # (re-)Locate the jump point, if any
1399: # Note this does not take filtering or hidden into account... need
1400: # to be fixed?
1401: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1402: my $curRes;
1403: my $foundJump = 0;
1404: my $counter = 0;
1405:
1406: while (($curRes = $mapIterator->next()) && !$foundJump) {
1407: if (ref($curRes)) { $counter++; }
1408:
1409: if (ref($curRes) && $jump eq $curRes->symb()) {
1410:
1411: # This is why we have to use the main iterator instead of the
1412: # potentially faster DFS: The count has to be the same, so
1413: # the order has to be the same, which DFS won't give us.
1414: $args->{'currentJumpIndex'} = $counter;
1415: $foundJump = 1;
1416: }
1417: }
1418:
1419: my $showParts = setDefault($args->{'showParts'}, 1);
1420: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1421: # keeps track of when the current resource is found,
1422: # so we can back up a few and put the anchor above the
1423: # current resource
1424: my $printKey = $args->{'printKey'};
1425: my $printCloseAll = $args->{'printCloseAll'};
1426: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1427:
1428: # Print key?
1429: if ($printKey) {
1430: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1431: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1432: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1433: if ($navmap->{LAST_CHECK}) {
1434: $result .=
1435: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
1436: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1437: '</td><td align="center" valign="bottom"> '.
1438: '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
1439: '</td>';
1440: } else {
1441: $result .= '<td align="center" valign="bottom"> '.
1442: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1443: ' <img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
1444: '</td>';
1445: }
1446:
1447: $result .= '</tr></table>';
1448: }
1449:
1450: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1451: my ($link,$text);
1452: if ($condition) {
1453: $link='navmaps?condition=0&filter=&'.$queryString.
1454: '&here='.&escape($here);
1455: $text='Close all folders';
1456: } else {
1457: $link='navmaps?condition=1&filter=&'.$queryString.
1458: '&here='.&escape($here);
1459: $text='Open all folders';
1460: }
1461: if ($env{'form.register'}) {
1462: $link .= '&register='.$env{'form.register'};
1463: }
1464: if ($args->{'caller'} eq 'navmapsdisplay') {
1465: &add_linkitem($args->{'linkitems'},'changefolder',
1466: "location.href='$link'",$text);
1467: } else {
1468: $result.= '<a href="'.$link.'">'.&mt($text).'</a>';
1469: }
1470: $result .= "\n";
1471: }
1472:
1473: # Check for any unread discussions in all resources.
1474: if ($args->{'caller'} eq 'navmapsdisplay') {
1475: &add_linkitem($args->{'linkitems'},'clearbubbles',
1476: 'document.clearbubbles.submit()',
1477: 'Mark all posts read');
1478: my $time=time;
1479: $result .= (<<END);
1480: <form name="clearbubbles" method="post" action="/adm/feedback">
1481: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1482: <input type="hidden" name="navtime" value="$time" />
1483: END
1484: if ($env{'form.register'}) {
1485: $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
1486: }
1487: if ($args->{'sort'} eq 'discussion') {
1488: my $totdisc = 0;
1489: my $haveDisc = '';
1490: my @allres=$navmap->retrieveResources();
1491: foreach my $resource (@allres) {
1492: if ($resource->hasDiscussion()) {
1493: $haveDisc .= $resource->wrap_symb().':';
1494: $totdisc ++;
1495: }
1496: }
1497: if ($totdisc > 0) {
1498: $haveDisc =~ s/:$//;
1499: $result .= (<<END);
1500: <input type="hidden" name="navmaps" value="$haveDisc" />
1501: </form>
1502: END
1503: }
1504: }
1505: $result.='</form>';
1506: }
1507:
1508: if ($args->{'caller'} eq 'navmapsdisplay') {
1509: $result .= '<table><tr><td>'.
1510: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td>';
1511: $result .= '<td> </td>';
1512: $result.='<td class="LC_middle">'.&mt('Tools:').'</td>';
1513: $result.=&show_linkitems_toolbar($args->{'linkitems'});
1514: if ($args->{'sort_html'}) {
1515: $result.='<td> </td><td> </td><td> </td>'.
1516: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1517: }
1518: $result .= '</table>';
1519: } elsif ($args->{'sort_html'}) {
1520: $result.=$args->{'sort_html'};
1521: }
1522:
1523: #$result .= "<br />\n";
1524: if ($r) {
1525: $r->print($result);
1526: $r->rflush();
1527: $result = "";
1528: }
1529: # End parameter setting
1530:
1531: $result .= "<br />\n";
1532:
1533: # Data
1534: $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");
1535:
1536: my $res = "Apache::lonnavmaps::resource";
1537: my %condenseStatuses =
1538: ( $res->NETWORK_FAILURE => 1,
1539: $res->NOTHING_SET => 1,
1540: $res->CORRECT => 1 );
1541:
1542: # Shared variables
1543: $args->{'counter'} = 0; # counts the rows
1544: $args->{'indentLevel'} = 0;
1545: $args->{'isNewBranch'} = 0;
1546: $args->{'condensed'} = 0;
1547:
1548: my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1549: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1550: $args->{'displayedHereMarker'} = 0;
1551:
1552: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1553: # since structure actually doesn't matter, except what map has what resources.
1554: if ($args->{'suppressEmptySequences'}) {
1555: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1556: $it->{FIRST_RESOURCE},
1557: $it->{FINISH_RESOURCE},
1558: {}, undef, 1);
1559: my $depth = 0;
1560: $dfsit->next();
1561: my $curRes = $dfsit->next();
1562: while ($depth > -1) {
1563: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1564: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1565:
1566: if (ref($curRes)) {
1567: # Parallel pre-processing: Do sequences have non-filtered-out children?
1568: if ($curRes->is_map()) {
1569: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1570: # Sequences themselves do not count as visible children,
1571: # unless those sequences also have visible children.
1572: # This means if a sequence appears, there's a "promise"
1573: # that there's something under it if you open it, somewhere.
1574: } else {
1575: # Not a sequence: if it's filtered, ignore it, otherwise
1576: # rise up the stack and mark the sequences as having children
1577: if (&$filterFunc($curRes)) {
1578: for my $sequence (@{$dfsit->getStack()}) {
1579: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1580: }
1581: }
1582: }
1583: }
1584: } continue {
1585: $curRes = $dfsit->next();
1586: }
1587: }
1588:
1589: my $displayedJumpMarker = 0;
1590: # Set up iteration.
1591: my $now = time();
1592: my $in24Hours = $now + 24 * 60 * 60;
1593: my $rownum = 0;
1594:
1595: # export "here" marker information
1596: $args->{'here'} = $here;
1597:
1598: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1599: my @resources;
1600: my $code='';# sub { !(shift->is_map();) };
1601: if ($args->{'sort'} eq 'title') {
1602: my $oldFilterFunc = $filterFunc;
1603: my $filterFunc=
1604: sub {
1605: my ($res)=@_;
1606: if ($res->is_map()) { return 0;}
1607: return &$oldFilterFunc($res);
1608: };
1609: @resources=$navmap->retrieveResources(undef,$filterFunc);
1610: @resources= sort { &cmp_title($a,$b) } @resources;
1611: } elsif ($args->{'sort'} eq 'duedate') {
1612: my $oldFilterFunc = $filterFunc;
1613: my $filterFunc=
1614: sub {
1615: my ($res)=@_;
1616: if (!$res->is_problem()) { return 0;}
1617: return &$oldFilterFunc($res);
1618: };
1619: @resources=$navmap->retrieveResources(undef,$filterFunc);
1620: @resources= sort {
1621: if ($a->duedate ne $b->duedate) {
1622: return $a->duedate cmp $b->duedate;
1623: }
1624: my $value=&cmp_title($a,$b);
1625: return $value;
1626: } @resources;
1627: } elsif ($args->{'sort'} eq 'discussion') {
1628: my $oldFilterFunc = $filterFunc;
1629: my $filterFunc=
1630: sub {
1631: my ($res)=@_;
1632: if (!$res->hasDiscussion() &&
1633: !$res->getFeedback() &&
1634: !$res->getErrors()) { return 0;}
1635: return &$oldFilterFunc($res);
1636: };
1637: @resources=$navmap->retrieveResources(undef,$filterFunc);
1638: @resources= sort { &cmp_title($a,$b) } @resources;
1639: } else {
1640: #unknow sort mechanism or default
1641: undef($args->{'sort'});
1642: }
1643:
1644:
1645: while (1) {
1646: if ($args->{'sort'}) {
1647: $curRes = shift(@resources);
1648: } else {
1649: $curRes = $it->next($closeAllPages);
1650:
1651: }
1652: if (!$curRes) { last; }
1653:
1654: # Maintain indentation level.
1655: if ($curRes == $it->BEGIN_MAP() ||
1656: $curRes == $it->BEGIN_BRANCH() ) {
1657: $args->{'indentLevel'}++;
1658: }
1659: if ($curRes == $it->END_MAP() ||
1660: $curRes == $it->END_BRANCH() ) {
1661: $args->{'indentLevel'}--;
1662: }
1663: # Notice new branches
1664: if ($curRes == $it->BEGIN_BRANCH()) {
1665: $args->{'isNewBranch'} = 1;
1666: }
1667:
1668: # If this isn't an actual resource, continue on
1669: if (!ref($curRes)) {
1670: next;
1671: }
1672:
1673: # If this has been filtered out, continue on
1674: if (!(&$filterFunc($curRes))) {
1675: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1676: next;
1677: }
1678:
1679: # If this is an empty sequence and we're filtering them, continue on
1680: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1681: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1682: next;
1683: }
1684:
1685: # If we're suppressing navmaps and this is a navmap, continue on
1686: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1687: next;
1688: }
1689:
1690: $args->{'counter'}++;
1691:
1692: # Does it have multiple parts?
1693: $args->{'multipart'} = 0;
1694: $args->{'condensed'} = 0;
1695: my @parts;
1696:
1697: # Decide what parts to show.
1698: if ($curRes->is_problem() && $showParts) {
1699: @parts = @{$curRes->parts()};
1700: $args->{'multipart'} = $curRes->multipart();
1701:
1702: if ($condenseParts) { # do the condensation
1703: if (!$args->{'condensed'}) {
1704: # Decide whether to condense based on similarity
1705: my $status = $curRes->status($parts[0]);
1706: my $due = $curRes->duedate($parts[0]);
1707: my $open = $curRes->opendate($parts[0]);
1708: my $statusAllSame = 1;
1709: my $dueAllSame = 1;
1710: my $openAllSame = 1;
1711: for (my $i = 1; $i < scalar(@parts); $i++) {
1712: if ($curRes->status($parts[$i]) != $status){
1713: $statusAllSame = 0;
1714: }
1715: if ($curRes->duedate($parts[$i]) != $due ) {
1716: $dueAllSame = 0;
1717: }
1718: if ($curRes->opendate($parts[$i]) != $open) {
1719: $openAllSame = 0;
1720: }
1721: }
1722: # $*allSame is true if all the statuses were
1723: # the same. Now, if they are all the same and
1724: # match one of the statuses to condense, or they
1725: # are all open with the same due date, or they are
1726: # all OPEN_LATER with the same open date, display the
1727: # status of the first non-zero part (to get the 'correct'
1728: # status right, since 0 is never 'correct' or 'open').
1729: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1730: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1731: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1732: @parts = ($parts[0]);
1733: $args->{'condensed'} = 1;
1734: }
1735: }
1736: # Multipart problem with one part: always "condense" (happens
1737: # to match the desirable behavior)
1738: if ($curRes->countParts() == 1) {
1739: @parts = ($parts[0]);
1740: $args->{'condensed'} = 1;
1741: }
1742: }
1743: }
1744:
1745: # If the multipart problem was condensed, "forget" it was multipart
1746: if (scalar(@parts) == 1) {
1747: $args->{'multipart'} = 0;
1748: } else {
1749: # Add part 0 so we display it correctly.
1750: unshift @parts, '0';
1751: }
1752:
1753: {
1754: my ($src,$symb,$anchor,$stack);
1755: if ($args->{'sort'}) {
1756: my $it = $navmap->getIterator(undef, undef, undef, 1);
1757: while ( my $res=$it->next()) {
1758: if (ref($res) &&
1759: $res->symb() eq $curRes->symb()) { last; }
1760: }
1761: $stack=$it->getStack();
1762: } else {
1763: $stack=$it->getStack();
1764: }
1765: ($src,$symb,$anchor)=getLinkForResource($stack);
1766: if (defined($anchor)) { $anchor='#'.$anchor; }
1767: my $srcHasQuestion = $src =~ /\?/;
1768: $args->{"resourceLink"} = $src.
1769: ($srcHasQuestion?'&':'?') .
1770: 'symb=' . &escape($symb).$anchor;
1771: }
1772: # Now, we've decided what parts to show. Loop through them and
1773: # show them.
1774: foreach my $part (@parts) {
1775: $rownum ++;
1776:
1777: $result .= &Apache::loncommon::start_data_table_row();
1778:
1779: # Set up some data about the parts that the cols might want
1780: my $filter = $it->{FILTER};
1781:
1782: # Now, display each column.
1783: foreach my $col (@$cols) {
1784: my $colHTML = '';
1785: if (ref($col)) {
1786: $colHTML .= &$col($curRes, $part, $args);
1787: } else {
1788: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1789: }
1790:
1791: # If this is the first column and it's time to print
1792: # the anchor, do so
1793: if ($col == $cols->[0] &&
1794: $args->{'counter'} == $args->{'currentJumpIndex'} -
1795: $currentJumpDelta) {
1796: # Jam the anchor after the <td> tag;
1797: # necessary for valid HTML (which Mozilla requires)
1798: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1799: $displayedJumpMarker = 1;
1800: }
1801: $result .= $colHTML . "\n";
1802: }
1803: $result .= &Apache::loncommon::end_data_table_row();
1804: $args->{'isNewBranch'} = 0;
1805: }
1806:
1807: if ($r && $rownum % 20 == 0) {
1808: $r->print($result);
1809: $result = "";
1810: $r->rflush();
1811: }
1812: } continue {
1813: if ($r) {
1814: # If we have the connection, make sure the user is still connected
1815: my $c = $r->connection;
1816: if ($c->aborted()) {
1817: # Who cares what we do, nobody will see it anyhow.
1818: return '';
1819: }
1820: }
1821: }
1822:
1823: # Print out the part that jumps to #curloc if it exists
1824: # delay needed because the browser is processing the jump before
1825: # it finishes rendering, so it goes to the wrong place!
1826: # onload might be better, but this routine has no access to that.
1827: # On mozilla, the 0-millisecond timeout seems to prevent this;
1828: # it's quite likely this might fix other browsers, too, and
1829: # certainly won't hurt anything.
1830: if ($displayedJumpMarker) {
1831: $result .= &Apache::lonhtmlcommon::scripttag("
1832: if (location.href.indexOf('#curloc')==-1) {
1833: setTimeout(\"location += '#curloc';\", 0)
1834: }
1835: ");
1836: }
1837:
1838: $result.=&Apache::loncommon::end_data_table();
1839:
1840: if ($r) {
1841: $r->print($result);
1842: $result = "";
1843: $r->rflush();
1844: }
1845:
1846: return $result;
1847: }
1848:
1849: sub add_linkitem {
1850: my ($linkitems,$name,$cmd,$text)=@_;
1851: $$linkitems{$name}{'cmd'}=$cmd;
1852: $$linkitems{$name}{'text'}=&mt($text);
1853: }
1854:
1855: sub show_linkitems_toolbar {
1856: my ($linkitems,$condition)=@_;
1857: my @linkorder = ('firsthomework','everything','uncompleted',
1858: 'changefolder','clearbubbles');
1859: my $result .='<td align="left">'."\n".
1860: '<span class="LC_nobreak">'."\n".
1861: '<ul id="LC_toolbar">';
1862: foreach my $link (@linkorder) {
1863: my $link_id = 'LC_content_toolbar_'.$link;
1864: if (defined($linkitems->{$link})) {
1865: if ($linkitems->{$link}{'text'} ne '') {
1866: $linkitems->{$link}{'cmd'}=~s/"/'/g;
1867: if ($linkitems->{$link}{'cmd'}) {
1868: if ($link eq 'changefolder') {
1869: if ($condition) {
1870: $link_id='LC_content_toolbar_changefolder_toggled';
1871: } else {
1872: $link_id='LC_content_toolbar_changefolder';
1873: }
1874: }
1875: $result .= '<li><a href="#" '.
1876: 'onclick="'.$linkitems->{$link}{'cmd'}.'" '.
1877: 'id="'.$link_id.'" '.
1878: 'class="LC_toolbarItem" '.
1879: 'title="'.$linkitems->{$link}{'text'}.'">'.
1880: '</a></li>'."\n";
1881: }
1882: }
1883: }
1884: }
1885: $result .= '</ul>'.
1886: '</span></td>'."\n";
1887: return $result;
1888: }
1889:
1890:
1891: 1;
1892:
1893:
1894:
1895:
1896:
1897:
1898:
1899:
1900:
1901: package Apache::lonnavmaps::navmap;
1902:
1903: =pod
1904:
1905: =head1 Object: Apache::lonnavmaps::navmap
1906:
1907: =head2 Overview
1908:
1909: The navmap object's job is to provide access to the resources
1910: in the course as Apache::lonnavmaps::resource objects, and to
1911: query and manage the relationship between those resource objects.
1912:
1913: Generally, you'll use the navmap object in one of three basic ways.
1914: In order of increasing complexity and power:
1915:
1916: =over 4
1917:
1918: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1919: various ways to obtain resource objects, based on various identifiers.
1920: Use this when you want to request information about one object or
1921: a handful of resources you already know the identities of, from some
1922: other source. For more about Ids, Symbs, and MapPcs, see the
1923: Resource documentation. Note that Url should be a B<last resort>,
1924: not your first choice; it only really works when there is only one
1925: instance of the resource in the course, which only applies to
1926: maps, and even that may change in the future (see the B<getResourceByUrl>
1927: documentation for more details.)
1928:
1929: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1930: retrieves resources matching some criterion and returns them
1931: in a flat array, with no structure information. Use this when
1932: you are manipulating a series of resources, based on what map
1933: the are in, but do not care about branching, or exactly how
1934: the maps and resources are related. This is the most common case.
1935:
1936: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1937: the course's navmap in various ways without writing the traversal
1938: code yourself. See iterator documentation below. Use this when
1939: you need to know absolutely everything about the course, including
1940: branches and the precise relationship between maps and resources.
1941:
1942: =back
1943:
1944: =head2 Creation And Destruction
1945:
1946: To create a navmap object, use the following function:
1947:
1948: =over 4
1949:
1950: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1951:
1952: Creates a new navmap object. Returns the navmap object if this is
1953: successful, or B<undef> if not.
1954:
1955: =back
1956:
1957: =head2 Methods
1958:
1959: =over 4
1960:
1961: =item * B<getIterator>(first, finish, filter, condition):
1962:
1963: See iterator documentation below.
1964:
1965: =cut
1966:
1967: use strict;
1968: use GDBM_File;
1969: use Apache::lonnet;
1970: use LONCAPA;
1971:
1972: sub new {
1973: # magic invocation to create a class instance
1974: my $proto = shift;
1975: my $class = ref($proto) || $proto;
1976: my $self = {};
1977: bless($self); # So we can call change_user if neceesary
1978:
1979: $self->{USERNAME} = shift || $env{'user.name'};
1980: $self->{DOMAIN} = shift || $env{'user.domain'};
1981:
1982:
1983:
1984: # Resource cache stores navmap resources as we reference them. We generate
1985: # them on-demand so we don't pay for creating resources unless we use them.
1986: $self->{RESOURCE_CACHE} = {};
1987:
1988: # Network failure flag, if we accessed the course or user opt and
1989: # failed
1990: $self->{NETWORK_FAILURE} = 0;
1991:
1992: # We can only tie the nav hash as done below if the username/domain
1993: # match the env one. Otherwise change_user does everything we need...since we can't
1994: # assume there are course hashes for the specific requested user@domamin:
1995: #
1996:
1997: if ( ($self->{USERNAME} eq $env{'user.name'}) && ($self->{DOMAIN} eq $env{'user.domain'})) {
1998:
1999: # tie the nav hash
2000:
2001: my %navmaphash;
2002: my %parmhash;
2003: my $courseFn = $env{"request.course.fn"};
2004: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2005: &GDBM_READER(), 0640))) {
2006: return undef;
2007: }
2008:
2009: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2010: &GDBM_READER(), 0640)))
2011: {
2012: untie %{$self->{PARM_HASH}};
2013: return undef;
2014: }
2015:
2016: $self->{NAV_HASH} = \%navmaphash;
2017: $self->{PARM_HASH} = \%parmhash;
2018: $self->{PARM_CACHE} = {};
2019: } else {
2020: $self->change_user($self->{USERNAME}, $self->{DOMAIN});
2021: }
2022:
2023: my $d = Data::Dumper->new([$self]);
2024:
2025: return $self;
2026: }
2027:
2028: #
2029: # In some instances it is useful to be able to dynamically change the
2030: # username/domain associated with a navmap (e.g. to navigate for someone
2031: # else besides the current user...if sufficiently privileged.
2032: # Parameters:
2033: # user - New user.
2034: # domain- Domain the user belongs to.
2035: # Implicit inputs:
2036: #
2037: sub change_user {
2038: my $self = shift;
2039: $self->{USERNAME} = shift;
2040: $self->{DOMAIN} = shift;
2041:
2042: # If the hashes are already tied make sure to break that bond:
2043:
2044: untie %{$self->{NAV_HASH}};
2045: untie %{$self->{PARM_HASH}};
2046:
2047: # The assumption is that we have to
2048: # use lonmap here to re-read the hash and from it reconstruct
2049: # new big and parameter hashes. An implicit assumption at this time
2050: # is that the course file is probably not created locally yet
2051: # an that we will therefore just read without tying.
2052:
2053: my ($cdom, $cnum) = split(/\_/, $env{'request.course.id'});
2054:
2055: my %big_hash;
2056: &Apache::lonmap::loadmap($cnum, $cdom, $self->{USERNAME}, $self->{DOMAIN}, \%big_hash);
2057: $self->{NAV_HASH} = \%big_hash;
2058:
2059:
2060:
2061: # Now clear the parm cache and reconstruct the parm hash fromt he big_hash
2062: # param.xxxx keys.
2063:
2064: $self->{PARM_CACHE} = {};
2065:
2066: my %parm_hash = {};
2067: foreach my $key (keys %big_hash) {
2068: if ($key =~ /^param\./) {
2069: my $param_key = $key;
2070: $param_key =~ s/^param\.//;
2071: $parm_hash{$param_key} = $big_hash{$key};
2072: }
2073: }
2074:
2075: $self->{PARM_HASH} = \%parm_hash;
2076:
2077:
2078:
2079:
2080: }
2081:
2082: sub generate_course_user_opt {
2083: my $self = shift;
2084: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2085:
2086: my $uname=$self->{USERNAME};
2087: my $udom=$self->{DOMAIN};
2088:
2089: my $cid=$env{'request.course.id'};
2090: my $cdom=$env{'course.'.$cid.'.domain'};
2091: my $cnum=$env{'course.'.$cid.'.num'};
2092:
2093: # ------------------------------------------------- Get coursedata (if present)
2094: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2095: # Check for network failure
2096: if (!ref($courseopt)) {
2097: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2098: $self->{NETWORK_FAILURE} = 1;
2099: }
2100: undef($courseopt);
2101: }
2102:
2103: # --------------------------------------------------- Get userdata (if present)
2104:
2105: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2106: # Check for network failure
2107: if (!ref($useropt)) {
2108: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2109: $self->{NETWORK_FAILURE} = 1;
2110: }
2111: undef($useropt);
2112: }
2113:
2114: $self->{COURSE_OPT} = $courseopt;
2115: $self->{USER_OPT} = $useropt;
2116:
2117: $self->{COURSE_USER_OPT_GENERATED} = 1;
2118:
2119: return;
2120: }
2121:
2122: sub generate_email_discuss_status {
2123: my $self = shift;
2124: my $symb = shift;
2125: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2126:
2127: my $cid=$env{'request.course.id'};
2128: my $cdom=$env{'course.'.$cid.'.domain'};
2129: my $cnum=$env{'course.'.$cid.'.num'};
2130:
2131: my %emailstatus = &Apache::lonnet::dump('email_status',$self->{DOMAIN},$self->{USERNAME});
2132: my $logoutTime = $emailstatus{'logout'};
2133: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2134: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2135: $courseLeaveTime : $logoutTime);
2136: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2137: $cdom, $cnum);
2138: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2139: $self->{DOMAIN},$self->{USERNAME},'lastread');
2140: my %lastreadtime = ();
2141: foreach my $key (keys %lastread) {
2142: my $shortkey = $key;
2143: $shortkey =~ s/_lastread$//;
2144: $lastreadtime{$shortkey} = $lastread{$key};
2145: }
2146:
2147: my %feedback=();
2148: my %error=();
2149: my @keys = &Apache::lonnet::getkeys('nohist_email',$self->{DOMAIN},
2150: $self->{USERNAME});
2151:
2152: foreach my $msgid (@keys) {
2153: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2154: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
2155: $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
2156: &Apache::lonenc::check_decrypt(\$symb);
2157: if (($fromcid ne '') && ($fromcid ne $cid)) {
2158: next;
2159: }
2160: if (defined($symb)) {
2161: if (defined($error) && $error == 1) {
2162: $error{$symb}.=','.$msgid;
2163: } else {
2164: $feedback{$symb}.=','.$msgid;
2165: }
2166: } else {
2167: my $plain=
2168: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
2169: if ($plain=~/ \[([^\]]+)\]\:/) {
2170: my $url=$1;
2171: if ($plain=~/\:Error \[/) {
2172: $error{$url}.=','.$msgid;
2173: } else {
2174: $feedback{$url}.=','.$msgid;
2175: }
2176: }
2177: }
2178: }
2179: }
2180:
2181: #symbs of resources that have feedbacks (will be urls pre-2.3)
2182: $self->{FEEDBACK} = \%feedback;
2183: #or errors (will be urls pre 2.3)
2184: $self->{ERROR_MSG} = \%error;
2185: $self->{DISCUSSION_TIME} = \%discussiontime;
2186: $self->{EMAIL_STATUS} = \%emailstatus;
2187: $self->{LAST_READ} = \%lastreadtime;
2188:
2189: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2190: }
2191:
2192: sub get_user_data {
2193: my $self = shift;
2194: if ($self->{RETRIEVED_USER_DATA}) { return; }
2195:
2196: # Retrieve performance data on problems
2197: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2198: $self->{DOMAIN},
2199: $self->{USERNAME});
2200: $self->{STUDENT_DATA} = \%student_data;
2201:
2202: $self->{RETRIEVED_USER_DATA} = 1;
2203: }
2204:
2205: sub get_discussion_data {
2206: my $self = shift;
2207: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2208: return $self->{DISCUSSION_DATA};
2209: }
2210:
2211: $self->generate_email_discuss_status();
2212:
2213: my $cid=$env{'request.course.id'};
2214: my $cdom=$env{'course.'.$cid.'.domain'};
2215: my $cnum=$env{'course.'.$cid.'.num'};
2216: # Retrieve discussion data for resources in course
2217: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
2218:
2219:
2220: $self->{DISCUSSION_DATA} = \%discussion_data;
2221: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2222: return $self->{DISCUSSION_DATA};
2223: }
2224:
2225:
2226: # Internal function: Takes a key to look up in the nav hash and implements internal
2227: # memory caching of that key.
2228: sub navhash {
2229: my $self = shift; my $key = shift;
2230: return $self->{NAV_HASH}->{$key};
2231: }
2232:
2233: =pod
2234:
2235: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2236: false otherwise. Undefined course maps indicate an error somewhere in
2237: LON-CAPA, and you will not be able to proceed with using the navmap.
2238: See the B<NAV> screen for an example of using this.
2239:
2240: =cut
2241:
2242: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2243: sub courseMapDefined {
2244: my $self = shift;
2245: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2246:
2247: my $firstres = $self->navhash("map_start_$uri");
2248: my $lastres = $self->navhash("map_finish_$uri");
2249: return $firstres && $lastres;
2250: }
2251:
2252: sub getIterator {
2253: my $self = shift;
2254: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2255: shift, undef, shift,
2256: shift, shift);
2257: return $iterator;
2258: }
2259:
2260: # Private method: Does the given resource (as a symb string) have
2261: # current discussion? Returns 0 if chat/mail data not extracted.
2262: sub hasDiscussion {
2263: my $self = shift;
2264: my $symb = shift;
2265: $self->generate_email_discuss_status();
2266:
2267: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2268:
2269: #return defined($self->{DISCUSSION_TIME}->{$symb});
2270:
2271: # backward compatibility (bulletin boards used to be 'wrapped')
2272: my $ressymb = $self->wrap_symb($symb);
2273: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2274: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2275: } else {
2276: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2277: 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).
2278: }
2279: }
2280:
2281: sub last_post_time {
2282: my $self = shift;
2283: my $symb = shift;
2284: my $ressymb = $self->wrap_symb($symb);
2285: return $self->{DISCUSSION_TIME}->{$ressymb};
2286: }
2287:
2288: sub discussion_info {
2289: my $self = shift;
2290: my $symb = shift;
2291: my $filter = shift;
2292:
2293: $self->get_discussion_data();
2294:
2295: my $ressymb = $self->wrap_symb($symb);
2296: # keys used to store bulletinboard postings use 'unwrapped' symb.
2297: my $discsymb = &escape($self->unwrap_symb($ressymb));
2298: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2299: if (!$version) { return; }
2300:
2301: my $prevread = $self->{LAST_READ}{$ressymb};
2302:
2303: my $count = 0;
2304: my $hiddenflag = 0;
2305: my $deletedflag = 0;
2306: my ($hidden,$deleted,%info);
2307:
2308: for (my $id=$version; $id>0; $id--) {
2309: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2310: my @keys=split(/:/,$vkeys);
2311: if (grep(/^hidden$/ ,@keys)) {
2312: if (!$hiddenflag) {
2313: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2314: $hiddenflag = 1;
2315: }
2316: } elsif (grep(/^deleted$/,@keys)) {
2317: if (!$deletedflag) {
2318: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2319: $deletedflag = 1;
2320: }
2321: } else {
2322: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2323: if ($filter eq 'unread') {
2324: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2325: next;
2326: }
2327: }
2328: $count++;
2329: $info{$count}{'subject'} =
2330: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2331: $info{$count}{'id'} = $id;
2332: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2333: }
2334: }
2335: }
2336: if (wantarray) {
2337: return ($count,%info);
2338: }
2339: return $count;
2340: }
2341:
2342: sub wrap_symb {
2343: my $self = shift;
2344: my $symb = shift;
2345: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2346: unless ($symb =~ m|adm/wrapper/adm|) {
2347: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2348: }
2349: }
2350: return $symb;
2351: }
2352:
2353: sub unwrap_symb {
2354: my $self = shift;
2355: my $ressymb = shift;
2356: my $discsymb = $ressymb;
2357: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2358: $discsymb = $1.$2;
2359: }
2360: return $discsymb;
2361: }
2362:
2363: # Private method: Does the given resource (as a symb string) have
2364: # current feedback? Returns the string in the feedback hash, which
2365: # will be false if it does not exist.
2366:
2367: sub getFeedback {
2368: my $self = shift;
2369: my $symb = shift;
2370: my $source = shift;
2371:
2372: $self->generate_email_discuss_status();
2373:
2374: if (!defined($self->{FEEDBACK})) { return ""; }
2375:
2376: my $feedback;
2377: if ($self->{FEEDBACK}->{$symb}) {
2378: $feedback = $self->{FEEDBACK}->{$symb};
2379: if ($self->{FEEDBACK}->{$source}) {
2380: $feedback .= ','.$self->{FEEDBACK}->{$source};
2381: }
2382: } else {
2383: if ($self->{FEEDBACK}->{$source}) {
2384: $feedback = $self->{FEEDBACK}->{$source};
2385: }
2386: }
2387: return $feedback;
2388: }
2389:
2390: # Private method: Get the errors for that resource (by source).
2391: sub getErrors {
2392: my $self = shift;
2393: my $symb = shift;
2394: my $src = shift;
2395:
2396: $self->generate_email_discuss_status();
2397:
2398: if (!defined($self->{ERROR_MSG})) { return ""; }
2399:
2400: my $errors;
2401: if ($self->{ERROR_MSG}->{$symb}) {
2402: $errors = $self->{ERROR_MSG}->{$symb};
2403: if ($self->{ERROR_MSG}->{$src}) {
2404: $errors .= ','.$self->{ERROR_MSG}->{$src};
2405: }
2406: } else {
2407: if ($self->{ERROR_MSG}->{$src}) {
2408: $errors = $self->{ERROR_MSG}->{$src};
2409: }
2410: }
2411: return $errors;
2412: }
2413:
2414: =pod
2415:
2416: =item * B<getById>(id):
2417:
2418: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2419: object for that resource. This method, or other methods that use it
2420: (as in the resource object) is the only proper way to obtain a
2421: resource object.
2422:
2423: =item * B<getBySymb>(symb):
2424:
2425: Based on the symb of the resource, get a resource object for that
2426: resource. This is one of the proper ways to get a resource object.
2427:
2428: =item * B<getByMapPc>(map_pc):
2429:
2430: Based on the map_pc of the resource, get a resource object for
2431: the given map. This is one of the proper ways to get a resource object.
2432:
2433: =cut
2434:
2435: # The strategy here is to cache the resource objects, and only construct them
2436: # as we use them. The real point is to prevent reading any more from the tied
2437: # hash than we have to, which should hopefully alleviate speed problems.
2438:
2439: sub getById {
2440: my $self = shift;
2441: my $id = shift;
2442:
2443: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2444: {
2445: return $self->{RESOURCE_CACHE}->{$id};
2446: }
2447:
2448: # resource handles inserting itself into cache.
2449: # Not clear why the quotes are necessary, but as of this
2450: # writing it doesn't work without them.
2451: return "Apache::lonnavmaps::resource"->new($self, $id);
2452: }
2453:
2454: sub getBySymb {
2455: my $self = shift;
2456: my $symb = shift;
2457:
2458: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2459: my $map = $self->getResourceByUrl($mapUrl);
2460: my $returnvalue = undef;
2461: if (ref($map)) {
2462: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2463: }
2464: return $returnvalue;
2465: }
2466:
2467: sub getByMapPc {
2468: my $self = shift;
2469: my $map_pc = shift;
2470: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2471: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2472: return $self->getById($map_id);
2473: }
2474:
2475: =pod
2476:
2477: =item * B<firstResource>():
2478:
2479: Returns a resource object reference corresponding to the first
2480: resource in the navmap.
2481:
2482: =cut
2483:
2484: sub firstResource {
2485: my $self = shift;
2486: my $firstResource = $self->navhash('map_start_' .
2487: &Apache::lonnet::clutter($env{'request.course.uri'}));
2488: return $self->getById($firstResource);
2489: }
2490:
2491: =pod
2492:
2493: =item * B<finishResource>():
2494:
2495: Returns a resource object reference corresponding to the last resource
2496: in the navmap.
2497:
2498: =cut
2499:
2500: sub finishResource {
2501: my $self = shift;
2502: my $firstResource = $self->navhash('map_finish_' .
2503: &Apache::lonnet::clutter($env{'request.course.uri'}));
2504: return $self->getById($firstResource);
2505: }
2506:
2507: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2508: # the actual lookup; parmval caches the results.
2509: sub parmval {
2510: my $self = shift;
2511: my ($what,$symb,$recurse)=@_;
2512: my $hashkey = $what."|||".$symb;
2513: my $cache = $self->{PARM_CACHE};
2514: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2515: if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') {
2516: if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
2517: if (wantarray) {
2518: return @{$self->{PARM_CACHE}->{$hashkey}};
2519: } else {
2520: return $self->{PARM_CACHE}->{$hashkey}->[0];
2521: }
2522: }
2523: } else {
2524: return $self->{PARM_CACHE}->{$hashkey};
2525: }
2526: }
2527: my $result = $self->parmval_real($what, $symb, $recurse);
2528: $self->{PARM_CACHE}->{$hashkey} = $result;
2529: if (wantarray) {
2530: return @{$result};
2531: }
2532: return $result->[0];
2533: }
2534:
2535: sub parmval_real {
2536: my $self = shift;
2537: my ($what,$symb,$recurse) = @_;
2538:
2539: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2540: $self->generate_course_user_opt();
2541:
2542: my $cid=$env{'request.course.id'};
2543: my $csec=$env{'request.course.sec'};
2544: my $cgroup='';
2545: my @cgrps=split(/:/,$env{'request.course.groups'});
2546: if (@cgrps > 0) {
2547: @cgrps = sort(@cgrps);
2548: $cgroup = $cgrps[0];
2549: }
2550: my $uname=$self->{USERNAME};
2551: my $udom=$self->{DOMAIN};
2552:
2553: unless ($symb) { return ['']; }
2554: my $result='';
2555:
2556: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2557: $mapname = &Apache::lonnet::deversion($mapname);
2558: # ----------------------------------------------------- Cascading lookup scheme
2559: my $rwhat=$what;
2560: $what=~s/^parameter\_//;
2561: $what=~s/\_/\./;
2562:
2563: my $symbparm=$symb.'.'.$what;
2564: my $mapparm=$mapname.'___(all).'.$what;
2565: my $usercourseprefix=$cid;
2566:
2567: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2568: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2569: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2570:
2571: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2572: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2573: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2574:
2575: my $courselevel= $usercourseprefix.'.'.$what;
2576: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2577: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2578:
2579: my $useropt = $self->{USER_OPT};
2580: my $courseopt = $self->{COURSE_OPT};
2581: my $parmhash = $self->{PARM_HASH};
2582:
2583: # ---------------------------------------------------------- first, check user
2584: if ($uname and defined($useropt)) {
2585: if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
2586: if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
2587: if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
2588: }
2589:
2590: # ------------------------------------------------------- second, check course
2591: if ($cgroup ne '' and defined($courseopt)) {
2592: if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
2593: if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
2594: if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
2595: }
2596:
2597: if ($csec and defined($courseopt)) {
2598: if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
2599: if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
2600: if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
2601: }
2602:
2603: if (defined($courseopt)) {
2604: if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
2605: }
2606:
2607: # ----------------------------------------------------- third, check map parms
2608:
2609: my $thisparm=$$parmhash{$symbparm};
2610: if (defined($thisparm)) { return [$thisparm,'map']; }
2611:
2612: # ----------------------------------------------------- fourth , check default
2613:
2614: my $meta_rwhat=$rwhat;
2615: $meta_rwhat=~s/\./_/g;
2616: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2617: if (defined($default)) { return [$default,'resource']}
2618: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2619: if (defined($default)) { return [$default,'resource']}
2620: # --------------------------------------------------- fifth, check more course
2621: if (defined($courseopt)) {
2622: if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
2623: if (defined($$courseopt{$courselevel})) {
2624: my $ret = [$$courseopt{$courselevel},'course'];
2625: return $ret;
2626: }
2627: }
2628: # --------------------------------------------------- sixth , cascade up parts
2629:
2630: my ($space,@qualifier)=split(/\./,$rwhat);
2631: my $qualifier=join('.',@qualifier);
2632: unless ($space eq '0') {
2633: my @parts=split(/_/,$space);
2634: my $id=pop(@parts);
2635: my $part=join('_',@parts);
2636: if ($part eq '') { $part='0'; }
2637: my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2638: if (defined($partgeneral[0])) { return \@partgeneral; }
2639: }
2640: if ($recurse) { return []; }
2641: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2642: if (defined($pack_def)) { return [$pack_def,'resource']; }
2643: return [''];
2644: }
2645:
2646: =pod
2647:
2648: =item * B<getResourceByUrl>(url,multiple):
2649:
2650: Retrieves a resource object by URL of the resource, unless the optional
2651: multiple parameter is included in which case an array of resource
2652: objects is returned. If passed a resource object, it will simply return
2653: it, so it is safe to use this method in code like
2654: "$res = $navmap->getResourceByUrl($res)"
2655: if you're not sure if $res is already an object, or just a URL. If the
2656: resource appears multiple times in the course, only the first instance
2657: will be returned (useful for maps), unless the multiple parameter has
2658: been included, in which case all instances are returned in an array.
2659:
2660: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2661:
2662: The map is a specification of a map to retreive the resources from,
2663: either as a url or as an object. The filterFunc is a reference to a
2664: function that takes a resource object as its one argument and returns
2665: true if the resource should be included, or false if it should not
2666: be. If recursive is true, the map will be recursively examined,
2667: otherwise it will not be. If bailout is true, the function will return
2668: as soon as it finds a resource, if false it will finish. If showall is
2669: true it will not hide maps that contain nothing but one other map. By
2670: default, the map is the top-level map of the course, filterFunc is a
2671: function that always returns 1, recursive is true, bailout is false,
2672: showall is false. The resources will be returned in a list containing
2673: the resource objects for the corresponding resources, with B<no
2674: structure information> in the list; regardless of branching,
2675: recursion, etc., it will be a flat list.
2676:
2677: Thus, this is suitable for cases where you don't want the structure,
2678: just a list of all resources. It is also suitable for finding out how
2679: many resources match a given description; for this use, if all you
2680: want to know is if I<any> resources match the description, the bailout
2681: parameter will allow you to avoid potentially expensive enumeration of
2682: all matching resources.
2683:
2684: =item * B<hasResource>(map, filterFunc, recursive, showall):
2685:
2686: Convenience method for
2687:
2688: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2689:
2690: which will tell whether the map has resources matching the description
2691: in the filter function.
2692:
2693: =item * B<usedVersion>(url):
2694:
2695: Retrieves version infomation for a url. Returns the version (a number, or
2696: the string "mostrecent") for resources which have version information in
2697: the big hash.
2698:
2699: =cut
2700:
2701:
2702: sub getResourceByUrl {
2703: my $self = shift;
2704: my $resUrl = shift;
2705: my $multiple = shift;
2706:
2707: if (ref($resUrl)) { return $resUrl; }
2708:
2709: $resUrl = &Apache::lonnet::clutter($resUrl);
2710: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2711: if (!$resId) { return ''; }
2712: if ($multiple) {
2713: my @resources = ();
2714: my @resIds = split (/,/, $resId);
2715: foreach my $id (@resIds) {
2716: my $resourceId = $self->getById($id);
2717: if ($resourceId) {
2718: push(@resources,$resourceId);
2719: }
2720: }
2721: return @resources;
2722: } else {
2723: if ($resId =~ /,/) {
2724: $resId = (split (/,/, $resId))[0];
2725: }
2726: return $self->getById($resId);
2727: }
2728: }
2729:
2730: sub retrieveResources {
2731: my $self = shift;
2732: my $map = shift;
2733: my $filterFunc = shift;
2734: if (!defined ($filterFunc)) {
2735: $filterFunc = sub {return 1;};
2736: }
2737: my $recursive = shift;
2738: if (!defined($recursive)) { $recursive = 1; }
2739: my $bailout = shift;
2740: if (!defined($bailout)) { $bailout = 0; }
2741: my $showall = shift;
2742: # Create the necessary iterator.
2743: if (!ref($map)) { # assume it's a url of a map.
2744: $map = $self->getResourceByUrl($map);
2745: }
2746:
2747: # If nothing was passed, assume top-level map
2748: if (!$map) {
2749: $map = $self->getById('0.0');
2750: }
2751:
2752: # Check the map's validity.
2753: if (!$map->is_map()) {
2754: # Oh, to throw an exception.... how I'd love that!
2755: return ();
2756: }
2757:
2758: # Get an iterator.
2759: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2760: undef, $recursive, $showall);
2761:
2762: my @resources = ();
2763:
2764: if (&$filterFunc($map)) {
2765: push(@resources, $map);
2766: }
2767:
2768: # Run down the iterator and collect the resources.
2769: my $curRes;
2770:
2771: while ($curRes = $it->next()) {
2772: if (ref($curRes)) {
2773: if (!&$filterFunc($curRes)) {
2774: next;
2775: }
2776:
2777: push(@resources, $curRes);
2778:
2779: if ($bailout) {
2780: return @resources;
2781: }
2782: }
2783:
2784: }
2785:
2786: return @resources;
2787: }
2788:
2789: sub hasResource {
2790: my $self = shift;
2791: my $map = shift;
2792: my $filterFunc = shift;
2793: my $recursive = shift;
2794: my $showall = shift;
2795:
2796: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2797: }
2798:
2799: sub usedVersion {
2800: my $self = shift;
2801: my $linkurl = shift;
2802: return $self->navhash("version_$linkurl");
2803: }
2804:
2805: 1;
2806:
2807: package Apache::lonnavmaps::iterator;
2808: use Scalar::Util qw(weaken);
2809: use Apache::lonnet;
2810:
2811: =pod
2812:
2813: =back
2814:
2815: =head1 Object: navmap Iterator
2816:
2817: An I<iterator> encapsulates the logic required to traverse a data
2818: structure. navmap uses an iterator to traverse the course map
2819: according to the criteria you wish to use.
2820:
2821: To obtain an iterator, call the B<getIterator>() function of a
2822: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2823: directly.) This will return a reference to the iterator:
2824:
2825: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2826:
2827: To get the next thing from the iterator, call B<next>:
2828:
2829: C<my $nextThing = $resourceIterator-E<gt>next()>
2830:
2831: getIterator behaves as follows:
2832:
2833: =over 4
2834:
2835: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2836:
2837: All parameters are optional. firstResource is a resource reference
2838: corresponding to where the iterator should start. It defaults to
2839: navmap->firstResource() for the corresponding nav map. finishResource
2840: corresponds to where you want the iterator to end, defaulting to
2841: navmap->finishResource(). filterHash is a hash used as a set
2842: containing strings representing the resource IDs, defaulting to
2843: empty. Condition is a 1 or 0 that sets what to do with the filter
2844: hash: If a 0, then only resources that exist IN the filterHash will be
2845: recursed on. If it is a 1, only resources NOT in the filterHash will
2846: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2847: false (default), the iterator will only return the first level of map
2848: that is not just a single, 'redirecting' map. If true, the iterator
2849: will return all information, starting with the top-level map,
2850: regardless of content. returnTopMap, if true (default false), will
2851: cause the iterator to return the top-level map object (resource 0.0)
2852: before anything else.
2853:
2854: Thus, by default, only top-level resources will be shown. Change the
2855: condition to a 1 without changing the hash, and all resources will be
2856: shown. Changing the condition to 1 and including some values in the
2857: hash will allow you to selectively suppress parts of the navmap, while
2858: leaving it on 0 and adding things to the hash will allow you to
2859: selectively add parts of the nav map. See the handler code for
2860: examples.
2861:
2862: The iterator will return either a reference to a resource object, or a
2863: token representing something in the map, such as the beginning of a
2864: new branch. The possible tokens are:
2865:
2866: =over 4
2867:
2868: =item * B<END_ITERATOR>:
2869:
2870: The iterator has returned all that it's going to. Further calls to the
2871: iterator will just produce more of these. This is a "false" value, and
2872: is the only false value the iterator which will be returned, so it can
2873: be used as a loop sentinel.
2874:
2875: =item * B<BEGIN_MAP>:
2876:
2877: A new map is being recursed into. This is returned I<after> the map
2878: resource itself is returned.
2879:
2880: =item * B<END_MAP>:
2881:
2882: The map is now done.
2883:
2884: =item * B<BEGIN_BRANCH>:
2885:
2886: A branch is now starting. The next resource returned will be the first
2887: in that branch.
2888:
2889: =item * B<END_BRANCH>:
2890:
2891: The branch is now done.
2892:
2893: =back
2894:
2895: The tokens are retreivable via methods on the iterator object, i.e.,
2896: $iterator->END_MAP.
2897:
2898: Maps can contain empty resources. The iterator will automatically skip
2899: over such resources, but will still treat the structure
2900: correctly. Thus, a complicated map with several branches, but
2901: consisting entirely of empty resources except for one beginning or
2902: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2903: but only one resource will be returned.
2904:
2905: =back
2906:
2907: =head2 Normal Usage
2908:
2909: Normal usage of the iterator object is to do the following:
2910:
2911: my $it = $navmap->getIterator([your params here]);
2912: my $curRes;
2913: while ($curRes = $it->next()) {
2914: [your logic here]
2915: }
2916:
2917: Note that inside of the loop, it's frequently useful to check if
2918: "$curRes" is a reference or not with the reference function; only
2919: resource objects will be references, and any non-references will
2920: be the tokens described above.
2921:
2922: Also note there is some old code floating around that trys to track
2923: the depth of the iterator to see when it's done; do not copy that
2924: code. It is difficult to get right and harder to understand than
2925: this. They should be migrated to this new style.
2926:
2927: =cut
2928:
2929: # Here are the tokens for the iterator:
2930:
2931: sub END_ITERATOR { return 0; }
2932: sub BEGIN_MAP { return 1; } # begining of a new map
2933: sub END_MAP { return 2; } # end of the map
2934: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2935: sub END_BRANCH { return 4; } # end of a branch
2936: sub FORWARD { return 1; } # go forward
2937: sub BACKWARD { return 2; }
2938:
2939: sub min {
2940: (my $a, my $b) = @_;
2941: if ($a < $b) { return $a; } else { return $b; }
2942: }
2943:
2944: sub new {
2945: # magic invocation to create a class instance
2946: my $proto = shift;
2947: my $class = ref($proto) || $proto;
2948: my $self = {};
2949:
2950: weaken($self->{NAV_MAP} = shift);
2951: return undef unless ($self->{NAV_MAP});
2952:
2953: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
2954: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
2955:
2956: # Handle the parameters
2957: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2958: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2959:
2960: # If the given resources are just the ID of the resource, get the
2961: # objects
2962: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2963: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2964: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2965: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2966:
2967: $self->{FILTER} = shift;
2968:
2969: # A hash, used as a set, of resource already seen
2970: $self->{ALREADY_SEEN} = shift;
2971: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2972: $self->{CONDITION} = shift;
2973:
2974: # Do we want to automatically follow "redirection" maps?
2975: $self->{FORCE_TOP} = shift;
2976:
2977: # Do we want to return the top-level map object (resource 0.0)?
2978: $self->{RETURN_0} = shift;
2979: # have we done that yet?
2980: $self->{HAVE_RETURNED_0} = 0;
2981:
2982: # Now, we need to pre-process the map, by walking forward and backward
2983: # over the parts of the map we're going to look at.
2984:
2985: # The processing steps are exactly the same, except for a few small
2986: # changes, so I bundle those up in the following list of two elements:
2987: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2988: # first_resource).
2989: # This prevents writing nearly-identical code twice.
2990: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2991: 'FIRST_RESOURCE'],
2992: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2993: 'FINISH_RESOURCE'] );
2994:
2995: my $maxDepth = 0; # tracks max depth
2996:
2997: # If there is only one resource in this map, and it's a map, we
2998: # want to remember that, so the user can ask for the first map
2999: # that isn't just a redirector.
3000: my $resource; my $resourceCount = 0;
3001:
3002: # Documentation on this algorithm can be found in the CVS repository at
3003: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
3004: # in that file.
3005: # **1**
3006:
3007: foreach my $pass (@iterations) {
3008: my $direction = $pass->[0];
3009: my $valName = $pass->[1];
3010: my $nextResourceMethod = $pass->[2];
3011: my $firstResourceName = $pass->[3];
3012:
3013: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
3014: $self->{FIRST_RESOURCE},
3015: $self->{FINISH_RESOURCE},
3016: {}, undef, 0, $direction);
3017:
3018: # prime the recursion
3019: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
3020: $iterator->next();
3021: my $curRes = $iterator->next();
3022: my $depth = 1;
3023: while ($depth > 0) {
3024: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
3025: if ($curRes == $iterator->END_MAP()) { $depth--; }
3026:
3027: if (ref($curRes)) {
3028: # If there's only one resource, this will save it
3029: # we have to filter empty resources from consideration here,
3030: # or even "empty", redirecting maps have two (start & finish)
3031: # or three (start, finish, plus redirector)
3032: if($direction == FORWARD && $curRes->src()) {
3033: $resource = $curRes; $resourceCount++;
3034: }
3035: my $resultingVal = $curRes->{DATA}->{$valName};
3036: my $nextResources = $curRes->$nextResourceMethod();
3037: my $nextCount = scalar(@{$nextResources});
3038:
3039: if ($nextCount == 1) { # **3**
3040: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
3041: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
3042: }
3043:
3044: if ($nextCount > 1) { # **4**
3045: foreach my $res (@{$nextResources}) {
3046: my $current = $res->{DATA}->{$valName} || 999999999;
3047: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
3048: }
3049: }
3050: }
3051:
3052: # Assign the final val (**2**)
3053: if (ref($curRes) && $direction == BACKWARD()) {
3054: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
3055: $curRes->{DATA}->{BOT_UP_VAL});
3056:
3057: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
3058: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
3059: }
3060:
3061: $curRes = $iterator->next();
3062: }
3063: }
3064:
3065: # Check: Was this only one resource, a map?
3066: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
3067: my $firstResource = $resource->map_start();
3068: my $finishResource = $resource->map_finish();
3069: my $result;
3070: my $rdump = Data::Dumper->new([$result]);
3071: $result = Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3072: $finishResource, $self->{FILTER},
3073: $self->{ALREADY_SEEN},
3074: $self->{CONDITION},
3075: $self->{FORCE_TOP});
3076: return $result;
3077:
3078:
3079: }
3080:
3081: # Set up some bookkeeping information.
3082: $self->{CURRENT_DEPTH} = 0;
3083: $self->{MAX_DEPTH} = $maxDepth;
3084: $self->{STACK} = [];
3085: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3086: $self->{FINISHED} = 0; # When true, the iterator has finished
3087:
3088: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
3089: push @{$self->{STACK}}, [];
3090: }
3091:
3092: # Prime the recursion w/ the first resource **5**
3093: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3094: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3095:
3096: bless ($self);
3097: my $selfDump = Data::Dumper->new([$self]);
3098:
3099: return $self;
3100: }
3101:
3102: sub next {
3103: my $self = shift;
3104: my $closeAllPages=shift;
3105: if ($self->{FINISHED}) {
3106: return END_ITERATOR();
3107: }
3108:
3109: # If we want to return the top-level map object, and haven't yet,
3110: # do so.
3111: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3112: $self->{HAVE_RETURNED_0} = 1;
3113: my $nextTopLevel = $self->{NAV_MAP}->getById('0.0');
3114:
3115: return $self->{NAV_MAP}->getById('0.0');
3116: }
3117: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
3118: $self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
3119: return $self->BEGIN_MAP();
3120: }
3121:
3122: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3123: # grab the next from the recursive iterator
3124: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3125:
3126: # is it a begin or end map? If so, update the depth
3127: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3128: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3129:
3130: # Are we back at depth 0? If so, stop recursing
3131: if ($self->{RECURSIVE_DEPTH} == 0) {
3132: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3133: }
3134: return $next;
3135: }
3136:
3137: if (defined($self->{FORCE_NEXT})) {
3138: my $tmp = $self->{FORCE_NEXT};
3139: $self->{FORCE_NEXT} = undef;
3140:
3141: return $tmp;
3142: }
3143:
3144: # Have we not yet begun? If not, return BEGIN_MAP and
3145: # remember we've started.
3146: if ( !$self->{STARTED} ) {
3147: $self->{STARTED} = 1;
3148: return $self->BEGIN_MAP();
3149: }
3150:
3151: # Here's the guts of the iterator.
3152:
3153: # Find the next resource, if any.
3154: my $found = 0;
3155: my $i = $self->{MAX_DEPTH};
3156: my $newDepth;
3157: my $here;
3158: while ( $i >= 0 && !$found ) {
3159: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3160: $here = pop @{$self->{STACK}->[$i]}; # **7**
3161: $found = 1;
3162: $newDepth = $i;
3163: }
3164: $i--;
3165: }
3166:
3167: # If we still didn't find anything, we're done.
3168: if ( !$found ) {
3169: # We need to get back down to the correct branch depth
3170: if ( $self->{CURRENT_DEPTH} > 0 ) {
3171: $self->{CURRENT_DEPTH}--;
3172: return END_BRANCH();
3173: } else {
3174: $self->{FINISHED} = 1;
3175: return END_MAP();
3176: }
3177: }
3178:
3179: # If this is not a resource, it must be an END_BRANCH marker we want
3180: # to return directly.
3181: if (!ref($here)) { # **8**
3182: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3183: $self->{CURRENT_DEPTH}--;
3184: return $here;
3185: }
3186: }
3187:
3188: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3189: $self->{HERE} = $here;
3190:
3191: # Get to the right level
3192: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3193: push @{$self->{STACK}->[$newDepth]}, $here;
3194: $self->{CURRENT_DEPTH}--;
3195: return END_BRANCH();
3196: }
3197: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3198: push @{$self->{STACK}->[$newDepth]}, $here;
3199: $self->{CURRENT_DEPTH}++;
3200: return BEGIN_BRANCH();
3201: }
3202:
3203: # If we made it here, we have the next resource, and we're at the
3204: # right branch level. So let's examine the resource for where
3205: # we can get to from here.
3206:
3207: # So we need to look at all the resources we can get to from here,
3208: # categorize them if we haven't seen them, remember if we have a new
3209: my $nextUnfiltered = $here->getNext();
3210:
3211:
3212: my $maxDepthAdded = -1;
3213:
3214: for (@$nextUnfiltered) {
3215: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3216: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3217: push @{$self->{STACK}->[$depth]}, $_;
3218: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3219: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3220: }
3221: }
3222:
3223: # Is this the end of a branch? If so, all of the resources examined above
3224: # led to lower levels than the one we are currently at, so we push a END_BRANCH
3225: # marker onto the stack so we don't forget.
3226: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3227: # BC branch and gets to C, it will see F as the only next resource, but it's
3228: # one level lower. Thus, this is the end of the branch, since there are no
3229: # more resources added to this level or above.
3230: # We don't do this if the examined resource is the finish resource,
3231: # because the condition given above is true, but the "END_MAP" will
3232: # take care of things and we should already be at depth 0.
3233: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3234: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3235: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3236: }
3237:
3238: # That ends the main iterator logic. Now, do we want to recurse
3239: # down this map (if this resource is a map)?
3240: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3241: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3242: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3243: my $firstResource = $self->{HERE}->map_start();
3244: my $finishResource = $self->{HERE}->map_finish();
3245: $self->{RECURSIVE_ITERATOR} =
3246: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3247: $finishResource, $self->{FILTER},
3248: $self->{ALREADY_SEEN},
3249: $self->{CONDITION},
3250: $self->{FORCE_TOP});
3251: }
3252:
3253: # If this is a blank resource, don't actually return it.
3254: # Should you ever find you need it, make sure to add an option to the code
3255: # that you can use; other things depend on this behavior.
3256: my $browsePriv = $self->{HERE}->browsePriv();
3257: if (!$self->{HERE}->src() ||
3258: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3259: return $self->next($closeAllPages);
3260: }
3261:
3262: my $hereResource = $self->{HERE};
3263:
3264: return $self->{HERE};
3265:
3266: }
3267:
3268: =pod
3269:
3270: The other method available on the iterator is B<getStack>, which
3271: returns an array populated with the current 'stack' of maps, as
3272: references to the resource objects. Example: This is useful when
3273: making the navigation map, as we need to check whether we are under a
3274: page map to see if we need to link directly to the resource, or to the
3275: page. The first elements in the array will correspond to the top of
3276: the stack (most inclusive map).
3277:
3278: =cut
3279:
3280: sub getStack {
3281: my $self=shift;
3282:
3283: my @stack;
3284:
3285: $self->populateStack(\@stack);
3286:
3287: return \@stack;
3288: }
3289:
3290: # Private method: Calls the iterators recursively to populate the stack.
3291: sub populateStack {
3292: my $self=shift;
3293: my $stack = shift;
3294:
3295: push @$stack, $self->{HERE} if ($self->{HERE});
3296:
3297: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3298: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3299: }
3300: }
3301:
3302: 1;
3303:
3304: package Apache::lonnavmaps::DFSiterator;
3305: use Scalar::Util qw(weaken);
3306: use Apache::lonnet;
3307:
3308: # Not documented in the perldoc: This is a simple iterator that just walks
3309: # through the nav map and presents the resources in a depth-first search
3310: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3311: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3312: # useful for pre-processing of some kind, and is in fact used by the main
3313: # iterator that way, but that's about it.
3314: # One could imagine merging this into the init routine of the main iterator,
3315: # but this might as well be left separate, since it is possible some other
3316: # use might be found for it. - Jeremy
3317:
3318: # Unlike the main iterator, this DOES return all resources, even blank ones.
3319: # The main iterator needs them to correctly preprocess the map.
3320:
3321: sub BEGIN_MAP { return 1; } # begining of a new map
3322: sub END_MAP { return 2; } # end of the map
3323: sub FORWARD { return 1; } # go forward
3324: sub BACKWARD { return 2; }
3325:
3326: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3327: # filter hash ref (or undef), already seen hash or undef, condition
3328: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3329: sub new {
3330: # magic invocation to create a class instance
3331: my $proto = shift;
3332: my $class = ref($proto) || $proto;
3333: my $self = {};
3334:
3335: weaken($self->{NAV_MAP} = shift);
3336: return undef unless ($self->{NAV_MAP});
3337:
3338: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3339: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3340:
3341: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3342: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3343:
3344: # If the given resources are just the ID of the resource, get the
3345: # objects
3346: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3347: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3348: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3349: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3350:
3351: $self->{FILTER} = shift;
3352:
3353: # A hash, used as a set, of resource already seen
3354: $self->{ALREADY_SEEN} = shift;
3355: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3356: $self->{CONDITION} = shift;
3357: $self->{DIRECTION} = shift || FORWARD();
3358:
3359: # Flag: Have we started yet?
3360: $self->{STARTED} = 0;
3361:
3362: # Should we continue calling the recursive iterator, if any?
3363: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3364: # The recursive iterator, if any
3365: $self->{RECURSIVE_ITERATOR} = undef;
3366: # Are we recursing on a map, or a branch?
3367: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3368: # And the count of how deep it is, so that this iterator can keep track of
3369: # when to pick back up again.
3370: $self->{RECURSIVE_DEPTH} = 0;
3371:
3372: # For keeping track of our branches, we maintain our own stack
3373: $self->{STACK} = [];
3374:
3375: # Start with the first resource
3376: if ($self->{DIRECTION} == FORWARD) {
3377: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3378: } else {
3379: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3380: }
3381:
3382: bless($self);
3383: return $self;
3384: }
3385:
3386: sub next {
3387: my $self = shift;
3388:
3389: # Are we using a recursive iterator? If so, pull from that and
3390: # watch the depth; we want to resume our level at the correct time.
3391: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3392: # grab the next from the recursive iterator
3393: my $next = $self->{RECURSIVE_ITERATOR}->next();
3394:
3395: # is it a begin or end map? Update depth if so
3396: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3397: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3398:
3399: # Are we back at depth 0? If so, stop recursing.
3400: if ($self->{RECURSIVE_DEPTH} == 0) {
3401: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3402: }
3403:
3404: return $next;
3405: }
3406:
3407: # Is there a current resource to grab? If not, then return
3408: # END_MAP, which will end the iterator.
3409: if (scalar(@{$self->{STACK}}) == 0) {
3410: return $self->END_MAP();
3411: }
3412:
3413: # Have we not yet begun? If not, return BEGIN_MAP and
3414: # remember that we've started.
3415: if ( !$self->{STARTED} ) {
3416: $self->{STARTED} = 1;
3417: return $self->BEGIN_MAP;
3418: }
3419:
3420: # Get the next resource in the branch
3421: $self->{HERE} = pop @{$self->{STACK}};
3422:
3423: # remember that we've seen this, so we don't return it again later
3424: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3425:
3426: # Get the next possible resources
3427: my $nextUnfiltered;
3428: if ($self->{DIRECTION} == FORWARD()) {
3429: $nextUnfiltered = $self->{HERE}->getNext();
3430:
3431: } else {
3432: $nextUnfiltered = $self->{HERE}->getPrevious();
3433: }
3434: my $next = [];
3435:
3436: # filter the next possibilities to remove things we've
3437: # already seen.
3438: foreach my $item (@$nextUnfiltered) {
3439: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3440: push @$next, $item;
3441: }
3442: }
3443:
3444: while (@$next) {
3445: # copy the next possibilities over to the stack
3446: push @{$self->{STACK}}, shift @$next;
3447: }
3448:
3449: # If this is a map and we want to recurse down it... (not filtered out)
3450: if ($self->{HERE}->is_map() &&
3451: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3452: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3453: my $firstResource = $self->{HERE}->map_start();
3454: my $finishResource = $self->{HERE}->map_finish();
3455:
3456: $self->{RECURSIVE_ITERATOR} =
3457: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3458: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3459: $self->{CONDITION}, $self->{DIRECTION});
3460: }
3461:
3462: return $self->{HERE};
3463: }
3464:
3465: # Identical to the full iterator methods of the same name. Hate to copy/paste
3466: # but I also hate to "inherit" either iterator from the other.
3467:
3468: sub getStack {
3469: my $self=shift;
3470:
3471: my @stack;
3472:
3473: $self->populateStack(\@stack);
3474:
3475: return \@stack;
3476: }
3477:
3478: # Private method: Calls the iterators recursively to populate the stack.
3479: sub populateStack {
3480: my $self=shift;
3481: my $stack = shift;
3482:
3483: push @$stack, $self->{HERE} if ($self->{HERE});
3484:
3485: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3486: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3487: }
3488: }
3489:
3490: 1;
3491:
3492: package Apache::lonnavmaps::resource;
3493: use Scalar::Util qw(weaken);
3494: use Apache::lonnet;
3495:
3496: =pod
3497:
3498: =head1 Object: resource
3499:
3500: X<resource, navmap object>
3501: A resource object encapsulates a resource in a resource map, allowing
3502: easy manipulation of the resource, querying the properties of the
3503: resource (including user properties), and represents a reference that
3504: can be used as the canonical representation of the resource by
3505: lonnavmap clients like renderers.
3506:
3507: A resource only makes sense in the context of a navmap, as some of the
3508: data is stored in the navmap object.
3509:
3510: You will probably never need to instantiate this object directly. Use
3511: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3512: starting resource.
3513:
3514: Resource objects respect the parameter_hiddenparts, which suppresses
3515: various parts according to the wishes of the map author. As of this
3516: writing, there is no way to override this parameter, and suppressed
3517: parts will never be returned, nor will their response types or ids be
3518: stored.
3519:
3520: =head2 Overview
3521:
3522: A B<Resource> is the most granular type of object in LON-CAPA that can
3523: be included in a course. It can either be a particular resource, like
3524: an HTML page, external resource, problem, etc., or it can be a
3525: container sequence, such as a "page" or a "map".
3526:
3527: To see a sequence from the user's point of view, please see the
3528: B<Creating a Course: Maps and Sequences> chapter of the Author's
3529: Manual.
3530:
3531: A Resource Object, once obtained from a navmap object via a B<getBy*>
3532: method of the navmap, or from an iterator, allows you to query
3533: information about that resource.
3534:
3535: Generally, you do not ever want to create a resource object yourself,
3536: so creation has been left undocumented. Always retrieve resources
3537: from navmap objects.
3538:
3539: =head3 Identifying Resources
3540:
3541: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3542: unique to that resource for a given course. X<resource ID, in big hash>
3543: The Resource ID has the form #.#, where the first number is the same
3544: for every resource in a map, and the second is unique. For instance,
3545: for a course laid out like this:
3546:
3547: * Problem 1
3548: * Map
3549: * Resource 2
3550: * Resource 3
3551:
3552: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3553: C<Resource 3> will share a first number. The second number may end up
3554: re-used between the two groups.
3555:
3556: The resource ID is only used in the big hash, but can be used in the
3557: context of a course to identify a resource easily. (For instance, the
3558: printing system uses it to record which resources from a sequence you
3559: wish to print.)
3560:
3561: X<symb> X<resource, symb>
3562: All resources also have B<symb>s, which uniquely identify a resource
3563: in a course. Many internal LON-CAPA functions expect a symb. A symb
3564: carries along with it the URL of the resource, and the map it appears
3565: in. Symbs are much larger than resource IDs.
3566:
3567: =cut
3568:
3569: sub new {
3570: # magic invocation to create a class instance
3571: my $proto = shift;
3572: my $class = ref($proto) || $proto;
3573: my $self = {};
3574:
3575: weaken($self->{NAV_MAP} = shift);
3576: $self->{ID} = shift;
3577:
3578: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3579: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3580:
3581: # Store this new resource in the parent nav map's cache.
3582: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3583: $self->{RESOURCE_ERROR} = 0;
3584:
3585: # A hash that can be used by two-pass algorithms to store data
3586: # about this resource in. Not used by the resource object
3587: # directly.
3588: $self->{DATA} = {};
3589:
3590: bless($self);
3591:
3592: return $self;
3593: }
3594:
3595: # private function: simplify the NAV_HASH lookups we keep doing
3596: # pass the name, and to automatically append my ID, pass a true val on the
3597: # second param
3598: sub navHash {
3599: my $self = shift;
3600: my $param = shift;
3601: my $id = shift;
3602: my $arg = $param . ($id?$self->{ID}:"");
3603: if (ref($self) && ref($self->{NAV_MAP}) && defined($arg)) {
3604: return $self->{NAV_MAP}->navhash($arg);
3605: }
3606: return;
3607: }
3608:
3609: =pod
3610:
3611: =head2 Methods
3612:
3613: Once you have a resource object, here's what you can do with it:
3614:
3615: =head3 Attribute Retrieval
3616:
3617: Every resource has certain attributes that can be retrieved and used:
3618:
3619: =over 4
3620:
3621: =item * B<ID>: Every resource has an ID that is unique for that
3622: resource in the course it is in. The ID is actually in the hash
3623: representing the resource, so for a resource object $res, obtain
3624: it via C<$res->{ID}).
3625:
3626: =item * B<compTitle>:
3627:
3628: Returns a "composite title", that is equal to $res->title() if the
3629: resource has a title, and is otherwise the last part of the URL (e.g.,
3630: "problem.problem").
3631:
3632: =item * B<ext>:
3633:
3634: Returns true if the resource is external.
3635:
3636: =item * B<kind>:
3637:
3638: Returns the kind of the resource from the compiled nav map.
3639:
3640: =item * B<randomout>:
3641:
3642: Returns true if this resource was chosen to NOT be shown to the user
3643: by the random map selection feature. In other words, this is usually
3644: false.
3645:
3646: =item * B<randompick>:
3647:
3648: Returns the number of randomly picked items for a map if the randompick
3649: feature is being used on the map.
3650:
3651: =item * B<randomorder>:
3652:
3653: Returns true for a map if the randomorder feature is being used on the
3654: map.
3655:
3656: =item * B<src>:
3657:
3658: Returns the source for the resource.
3659:
3660: =item * B<symb>:
3661:
3662: Returns the symb for the resource.
3663:
3664: =item * B<title>:
3665:
3666: Returns the title of the resource.
3667:
3668: =back
3669:
3670: =cut
3671:
3672: # These info functions can be used directly, as they don't return
3673: # resource information.
3674: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3675: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3676: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3677: sub from { my $self=shift; return $self->navHash("from_", 1); }
3678: # considered private and undocumented
3679: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3680: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3681: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3682: sub randompick {
3683: my $self = shift;
3684: my $randompick = $self->parmval('randompick');
3685: return $randompick;
3686: }
3687: sub randomorder {
3688: my $self = shift;
3689: my $randomorder = $self->parmval('randomorder');
3690: return ($randomorder =~ /^yes$/i);
3691: }
3692: sub link {
3693: my $self=shift;
3694: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3695: return $self->src;
3696: }
3697: sub src {
3698: my $self=shift;
3699: return $self->navHash("src_", 1);
3700: }
3701: sub shown_symb {
3702: my $self=shift;
3703: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3704: return $self->symb();
3705: }
3706: sub id {
3707: my $self=shift;
3708: return $self->{ID};
3709: }
3710: sub enclosing_map_src {
3711: my $self=shift;
3712: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3713: return $self->navHash('map_id_'.$first);
3714: }
3715: sub symb {
3716: my $self=shift;
3717: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3718: my $symbSrc = &Apache::lonnet::declutter($self->src());
3719: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3720: . '___' . $second . '___' . $symbSrc;
3721: return &Apache::lonnet::symbclean($symb);
3722: }
3723: sub wrap_symb {
3724: my $self = shift;
3725: return $self->{NAV_MAP}->wrap_symb($self->symb());
3726: }
3727: sub title {
3728: my $self=shift;
3729: if ($self->{ID} eq '0.0') {
3730: # If this is the top-level map, return the title of the course
3731: # since this map can not be titled otherwise.
3732: return $env{'course.'.$env{'request.course.id'}.'.description'};
3733: }
3734: return $self->navHash("title_", 1); }
3735: # considered private and undocumented
3736: sub to { my $self=shift; return $self->navHash("to_", 1); }
3737: sub condition {
3738: my $self=shift;
3739: my $undercond=$self->navHash("undercond_", 1);
3740: if (!defined($undercond)) { return 1; };
3741: my $condid=$self->navHash("condid_$undercond");
3742: if (!defined($condid)) { return 1; };
3743: my $condition=&Apache::lonnet::directcondval($condid);
3744: return $condition;
3745: }
3746: sub condval {
3747: my $self=shift;
3748: my ($pathname,$filename) =
3749: &Apache::lonnet::split_uri_for_cond($self->src());
3750:
3751: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3752: /\&\Q$filename\E\:([\d\|]+)\&/);
3753: if ($match) {
3754: return &Apache::lonnet::condval($1);
3755: }
3756: return 0;
3757: }
3758: sub compTitle {
3759: my $self = shift;
3760: my $title = $self->title();
3761: $title=~s/\&colon\;/\:/gs;
3762: if (!$title) {
3763: $title = $self->src();
3764: $title = substr($title, rindex($title, '/') + 1);
3765: }
3766: return $title;
3767: }
3768:
3769: =pod
3770:
3771: B<Predicate Testing the Resource>
3772:
3773: These methods are shortcuts to deciding if a given resource has a given property.
3774:
3775: =over 4
3776:
3777: =item * B<is_map>:
3778:
3779: Returns true if the resource is a map type.
3780:
3781: =item * B<is_problem>:
3782:
3783: Returns true if the resource is a problem type, false
3784: otherwise. (Looks at the extension on the src field; might need more
3785: to work correctly.)
3786:
3787: =item * B<is_page>:
3788:
3789: Returns true if the resource is a page.
3790:
3791: =item * B<is_sequence>:
3792:
3793: Returns true if the resource is a sequence.
3794:
3795: =back
3796:
3797: =cut
3798:
3799: sub hasResource {
3800: my $self = shift;
3801: return $self->{NAV_MAP}->hasResource(@_);
3802: }
3803:
3804: sub retrieveResources {
3805: my $self = shift;
3806: return $self->{NAV_MAP}->retrieveResources(@_);
3807: }
3808:
3809: sub is_exam {
3810: my ($self,$part) = @_;
3811: my $type = $self->parmval('type',$part);
3812: if ($type eq 'exam') {
3813: return 1;
3814: }
3815: if ($self->src() =~ /\.(exam)$/) {
3816: return 1;
3817: }
3818: return 0;
3819: }
3820: sub is_html {
3821: my $self=shift;
3822: my $src = $self->src();
3823: return ($src =~ /html$/);
3824: }
3825: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3826: sub is_page {
3827: my $self=shift;
3828: my $src = $self->src();
3829: return $self->navHash("is_map_", 1) &&
3830: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3831: }
3832: sub is_practice {
3833: my $self=shift;
3834: my ($part) = @_;
3835: my $type = $self->parmval('type',$part);
3836: if ($type eq 'practice') {
3837: return 1;
3838: }
3839: return 0;
3840: }
3841: sub is_problem {
3842: my $self=shift;
3843: my $src = $self->src();
3844: if ($src =~ /$LONCAPA::assess_re/) {
3845: return !($self->is_practice());
3846: }
3847: return 0;
3848: }
3849: #
3850: # The has below is the set of status that are considered 'incomplete'
3851: #
3852: my %incomplete_hash =
3853: (
3854: TRIES_LEFT() => 1,
3855: OPEN() => 1,
3856: ATTEMPTED() => 1
3857:
3858: );
3859: #
3860: # Return tru if a problem is incomplete... for now incomplete means that
3861: # any part of the problem is incomplete.
3862: # Note that if the resources is not a problem, 0 is returned.
3863: #
3864: sub is_incomplete {
3865: my $self = shift;
3866: if ($self->is_problem()) {
3867: foreach my $part (@{$self->parts()}) {
3868: if (exists($incomplete_hash{$self->status($part)})) {
3869: return 1;
3870: }
3871: }
3872: }
3873: return 0;
3874:
3875: }
3876: sub is_raw_problem {
3877: my $self=shift;
3878: my $src = $self->src();
3879: if ($src =~ /$LONCAPA::assess_re/) {
3880: return 1;
3881: }
3882: return 0;
3883: }
3884:
3885: sub contains_problem {
3886: my $self=shift;
3887: if ($self->is_page()) {
3888: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3889: return $hasProblem;
3890: }
3891: return 0;
3892: }
3893: sub map_contains_problem {
3894: my $self=shift;
3895: if ($self->is_map()) {
3896: my $has_problem=
3897: $self->hasResource($self,sub { $_[0]->is_problem() },1);
3898: return $has_problem;
3899: }
3900: return 0;
3901: }
3902: sub is_sequence {
3903: my $self=shift;
3904: return $self->navHash("is_map_", 1) &&
3905: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3906: }
3907: sub is_survey {
3908: my $self = shift();
3909: my $part = shift();
3910: my $type = $self->parmval('type',$part);
3911: if (($type eq 'survey') || ($type eq 'surveycred')) {
3912: return 1;
3913: }
3914: if ($self->src() =~ /\.(survey)$/) {
3915: return 1;
3916: }
3917: return 0;
3918: }
3919: sub is_anonsurvey {
3920: my $self = shift();
3921: my $part = shift();
3922: my $type = $self->parmval('type',$part);
3923: if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
3924: return 1;
3925: }
3926: return 0;
3927: }
3928: sub is_task {
3929: my $self=shift;
3930: my $src = $self->src();
3931: return ($src =~ /\.(task)$/)
3932: }
3933:
3934: sub is_empty_sequence {
3935: my $self=shift;
3936: my $src = $self->src();
3937: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3938: }
3939:
3940: # Private method: Shells out to the parmval in the nav map, handler parts.
3941: sub parmval {
3942: my $self = shift;
3943: my $what = shift;
3944: my $part = shift;
3945: if (!defined($part)) {
3946: $part = '0';
3947: }
3948: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3949: }
3950:
3951: =pod
3952:
3953: B<Map Methods>
3954:
3955: These methods are useful for getting information about the map
3956: properties of the resource, if the resource is a map (B<is_map>).
3957:
3958: =over 4
3959:
3960: =item * B<map_finish>:
3961:
3962: Returns a reference to a resource object corresponding to the finish
3963: resource of the map.
3964:
3965: =item * B<map_pc>:
3966:
3967: Returns the pc value of the map, which is the first number that
3968: appears in the resource ID of the resources in the map, and is the
3969: number that appears around the middle of the symbs of the resources in
3970: that map.
3971:
3972: =item * B<map_start>:
3973:
3974: Returns a reference to a resource object corresponding to the start
3975: resource of the map.
3976:
3977: =item * B<map_type>:
3978:
3979: Returns a string with the type of the map in it.
3980:
3981: =item *B<map_hierarchy>:
3982:
3983: Returns a string with a comma-separated ordered list of map_pc IDs
3984: for the hierarchy of maps containing a map, with the top level
3985: map first, then descending to deeper levels, with the enclosing map last.
3986:
3987: =back
3988:
3989: =cut
3990:
3991: sub map_finish {
3992: my $self = shift;
3993: my $src = $self->src();
3994: $src = &Apache::lonnet::clutter($src);
3995: my $res = $self->navHash("map_finish_$src", 0);
3996: $res = $self->{NAV_MAP}->getById($res);
3997: return $res;
3998: }
3999: sub map_pc {
4000: my $self = shift;
4001: my $src = $self->src();
4002: return $self->navHash("map_pc_$src", 0);
4003: }
4004: sub map_start {
4005: my $self = shift;
4006: my $src = $self->src();
4007: $src = &Apache::lonnet::clutter($src);
4008: my $res = $self->navHash("map_start_$src", 0);
4009: $res = $self->{NAV_MAP}->getById($res);
4010: return $res;
4011: }
4012: sub map_type {
4013: my $self = shift;
4014: my $pc = $self->map_pc();
4015: return $self->navHash("map_type_$pc", 0);
4016: }
4017: sub map_hierarchy {
4018: my $self = shift;
4019: my $pc = $self->map_pc();
4020: return $self->navHash("map_hierarchy_$pc", 0);
4021: }
4022:
4023: #####
4024: # Property queries
4025: #####
4026:
4027: # These functions will be responsible for returning the CORRECT
4028: # VALUE for the parameter, no matter what. So while they may look
4029: # like direct calls to parmval, they can be more than that.
4030: # So, for instance, the duedate function should use the "duedatetype"
4031: # information, rather than the resource object user.
4032:
4033: =pod
4034:
4035: =head2 Resource Parameters
4036:
4037: In order to use the resource parameters correctly, the nav map must
4038: have been instantiated with genCourseAndUserOptions set to true, so
4039: the courseopt and useropt is read correctly. Then, you can call these
4040: functions to get the relevant parameters for the resource. Each
4041: function defaults to part "0", but can be directed to another part by
4042: passing the part as the parameter.
4043:
4044: These methods are responsible for getting the parameter correct, not
4045: merely reflecting the contents of the GDBM hashes. As we move towards
4046: dates relative to other dates, these methods should be updated to
4047: reflect that. (Then, anybody using these methods will not have to update
4048: their code.)
4049:
4050: =over 4
4051:
4052: =item * B<printable>
4053:
4054: returns true if the current date is such that the
4055: specified resource part is printable.
4056:
4057: =item * B<resprintable>
4058:
4059: Returns true if all parts in the resource are printable making the
4060: entire resource printable.
4061:
4062: =item * B<acc>
4063:
4064: Get the Client IP/Name Access Control information.
4065:
4066: =item * B<answerdate>:
4067:
4068: Get the answer-reveal date for the problem.
4069:
4070: =item * B<awarded>:
4071:
4072: Gets the awarded value for the problem part. Requires genUserData set to
4073: true when the navmap object was created.
4074:
4075: =item * B<duedate>:
4076:
4077: Get the due date for the problem.
4078:
4079: =item * B<tries>:
4080:
4081: Get the number of tries the student has used on the problem.
4082:
4083: =item * B<maxtries>:
4084:
4085: Get the number of max tries allowed.
4086:
4087: =item * B<opendate>:
4088:
4089: Get the open date for the problem.
4090:
4091: =item * B<sig>:
4092:
4093: Get the significant figures setting.
4094:
4095: =item * B<tol>:
4096:
4097: Get the tolerance for the problem.
4098:
4099: =item * B<tries>:
4100:
4101: Get the number of tries the user has already used on the problem.
4102:
4103: =item * B<type>:
4104:
4105: Get the question type for the problem.
4106:
4107: =item * B<weight>:
4108:
4109: Get the weight for the problem.
4110:
4111: =back
4112:
4113: =cut
4114:
4115: sub printable {
4116:
4117: my ($self, $part) = @_;
4118:
4119: # Get the print open/close dates for the resource.
4120:
4121: my $start = $self->parmval("prinstartdate", $part);
4122: my $end = $self->parmval("printenddate", $part);
4123:
4124: # The following cases apply:
4125: # - No dates set: Printable.
4126: # - Start date set but no end date: Printable if now >= start date.
4127: # - End date set but no start date: Printable if now <= end date.
4128: # - both defined: printable if start <= now <= end
4129: #
4130: my $now = time();
4131:
4132: my $startok = 1;
4133: my $endok = 1;
4134:
4135: if ((defined $start) && ($start ne '')) {
4136: $startok = $start <= $now;
4137: }
4138: if ((defined $end) && ($end != '')) {
4139: $endok = $end >= $now;
4140: }
4141: return $startok && $endok;
4142: }
4143:
4144: sub resprintable {
4145: my $self = shift;
4146:
4147: # get parts...or realize there are no parts.
4148:
4149: my $partsref = $self->parts();
4150: my @parts = @$partsref;
4151:
4152: if ((!defined(@parts)) || (scalar(@parts) == 0)) {
4153: return $self->printable(0);
4154: } else {
4155: foreach my $part (@parts) {
4156: if (!$self->printable($part)) {
4157: return 0;
4158: }
4159: }
4160: return 1;
4161: }
4162: }
4163:
4164: sub acc {
4165: (my $self, my $part) = @_;
4166: my $acc = $self->parmval("acc", $part);
4167: return $acc;
4168: }
4169: sub answerdate {
4170: (my $self, my $part) = @_;
4171: # Handle intervals
4172: my $answerdatetype = $self->parmval("answerdate.type", $part);
4173: my $answerdate = $self->parmval("answerdate", $part);
4174: my $duedate = $self->parmval("duedate", $part);
4175: if ($answerdatetype eq 'date_interval') {
4176: $answerdate = $duedate + $answerdate;
4177: }
4178: return $answerdate;
4179: }
4180: sub awarded {
4181: my $self = shift; my $part = shift;
4182: $self->{NAV_MAP}->get_user_data();
4183: if (!defined($part)) { $part = '0'; }
4184: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
4185: }
4186: sub taskversion {
4187: my $self = shift; my $part = shift;
4188: $self->{NAV_MAP}->get_user_data();
4189: if (!defined($part)) { $part = '0'; }
4190: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.version'};
4191: }
4192: sub taskstatus {
4193: my $self = shift; my $part = shift;
4194: $self->{NAV_MAP}->get_user_data();
4195: if (!defined($part)) { $part = '0'; }
4196: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
4197: }
4198: sub solved {
4199: my $self = shift; my $part = shift;
4200: $self->{NAV_MAP}->get_user_data();
4201: if (!defined($part)) { $part = '0'; }
4202: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.solved'};
4203: }
4204: sub checkedin {
4205: my $self = shift; my $part = shift;
4206: $self->{NAV_MAP}->get_user_data();
4207: if (!defined($part)) { $part = '0'; }
4208: if ($self->is_task()) {
4209: my $version = $self->taskversion($part);
4210: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
4211: } else {
4212: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin.slot'});
4213: }
4214: }
4215: # this should work exactly like the copy in lonhomework.pm
4216: # Why is there a copy in lonhomework? Why not centralized?
4217: #
4218: # TODO: Centralize duedate.
4219: #
4220:
4221: sub duedate {
4222: (my $self, my $part) = @_;
4223: my $date;
4224: my @interval=$self->parmval("interval", $part);
4225: my $due_date=$self->parmval("duedate", $part);
4226: if ($interval[0] =~ /\d+/) {
4227: my $first_access=&Apache::lonnet::get_first_access($interval[1],
4228: $self->symb);
4229: if (defined($first_access)) {
4230: my $interval = $first_access+$interval[0];
4231: $date = (!$due_date || $interval < $due_date) ? $interval
4232: : $due_date;
4233: } else {
4234: $date = $due_date;
4235: }
4236: } else {
4237: $date = $due_date;
4238: }
4239: return $date;
4240: }
4241: sub handgrade {
4242: (my $self, my $part) = @_;
4243: my @response_ids = $self->responseIds($part);
4244: if (@response_ids) {
4245: foreach my $response_id (@response_ids) {
4246: my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
4247: if (lc($handgrade) eq 'yes') {
4248: return 'yes';
4249: }
4250: }
4251: }
4252: my $handgrade = $self->parmval("handgrade", $part);
4253: return $handgrade;
4254: }
4255: sub maxtries {
4256: (my $self, my $part) = @_;
4257: my $maxtries = $self->parmval("maxtries", $part);
4258: return $maxtries;
4259: }
4260: sub opendate {
4261: (my $self, my $part) = @_;
4262: my $opendatetype = $self->parmval("opendate.type", $part);
4263: my $opendate = $self->parmval("opendate", $part);
4264: if ($opendatetype eq 'date_interval') {
4265: my $duedate = $self->duedate($part);
4266: $opendate = $duedate - $opendate;
4267: }
4268: return $opendate;
4269: }
4270: sub problemstatus {
4271: (my $self, my $part) = @_;
4272: my $problemstatus = $self->parmval("problemstatus", $part);
4273: return lc($problemstatus);
4274: }
4275: sub sig {
4276: (my $self, my $part) = @_;
4277: my $sig = $self->parmval("sig", $part);
4278: return $sig;
4279: }
4280: sub tol {
4281: (my $self, my $part) = @_;
4282: my $tol = $self->parmval("tol", $part);
4283: return $tol;
4284: }
4285: sub tries {
4286: my $self = shift;
4287: my $tries = $self->queryRestoreHash('tries', shift);
4288: if (!defined($tries)) { return '0';}
4289: return $tries;
4290: }
4291: sub type {
4292: (my $self, my $part) = @_;
4293: my $type = $self->parmval("type", $part);
4294: return $type;
4295: }
4296: sub weight {
4297: my $self = shift; my $part = shift;
4298: if (!defined($part)) { $part = '0'; }
4299: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
4300: $self->symb(), $self->{DOMAIN},
4301: $self->{USERNAME},
4302: $env{'request.course.sec'});
4303: return $weight;
4304: }
4305: sub part_display {
4306: my $self= shift(); my $partID = shift();
4307: if (! defined($partID)) { $partID = '0'; }
4308: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
4309: $self->symb);
4310: if (! defined($display) || $display eq '') {
4311: $display = $partID;
4312: }
4313: return $display;
4314: }
4315: sub slot_control {
4316: my $self=shift(); my $part = shift();
4317: if (!defined($part)) { $part = '0'; }
4318: my $useslots = $self->parmval("useslots", $part);
4319: my $availablestudent = $self->parmval("availablestudent", $part);
4320: my $available = $self->parmval("available", $part);
4321: return ($useslots,$availablestudent,$available);
4322: }
4323:
4324: # Multiple things need this
4325: sub getReturnHash {
4326: my $self = shift;
4327:
4328: if (!defined($self->{RETURN_HASH})) {
4329: my %tmpHash = &Apache::lonnet::restore($self->symb(),undef,$self->{DOMAIN},$self->{USERNAME});
4330: $self->{RETURN_HASH} = \%tmpHash;
4331: }
4332: }
4333:
4334: ######
4335: # Status queries
4336: ######
4337:
4338: # These methods query the status of problems.
4339:
4340: # If we need to count parts, this function determines the number of
4341: # parts from the metadata. When called, it returns a reference to a list
4342: # of strings corresponding to the parts. (Thus, using it in a scalar context
4343: # tells you how many parts you have in the problem:
4344: # $partcount = scalar($resource->countParts());
4345: # Don't use $self->{PARTS} directly because you don't know if it's been
4346: # computed yet.
4347:
4348: =pod
4349:
4350: =head2 Resource misc
4351:
4352: Misc. functions for the resource.
4353:
4354: =over 4
4355:
4356: =item * B<hasDiscussion>:
4357:
4358: Returns a false value if there has been discussion since the user last
4359: logged in, true if there has. Always returns false if the discussion
4360: data was not extracted when the nav map was constructed.
4361:
4362: =item * B<last_post_time>:
4363:
4364: Returns a false value if there hasn't been discussion otherwise returns
4365: unix timestamp of last time a discussion posting (or edit) was made.
4366:
4367: =item * B<discussion_info>:
4368:
4369: optional argument is a filter (currently can be 'unread');
4370: returns in scalar context the count of the number of discussion postings.
4371:
4372: returns in list context both the count of postings and a hash ref
4373: containing information about the postings (subject, id, timestamp) in a hash.
4374:
4375: 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.
4376:
4377: =item * B<getFeedback>:
4378:
4379: Gets the feedback for the resource and returns the raw feedback string
4380: for the resource, or the null string if there is no feedback or the
4381: email data was not extracted when the nav map was constructed. Usually
4382: used like this:
4383:
4384: for my $url (split(/\,/, $res->getFeedback())) {
4385: my $link = &escape($url);
4386: ...
4387:
4388: and use the link as appropriate.
4389:
4390: =cut
4391:
4392: sub hasDiscussion {
4393: my $self = shift;
4394: return $self->{NAV_MAP}->hasDiscussion($self->symb());
4395: }
4396:
4397: sub last_post_time {
4398: my $self = shift;
4399: return $self->{NAV_MAP}->last_post_time($self->symb());
4400: }
4401:
4402: sub discussion_info {
4403: my ($self,$filter) = @_;
4404: return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
4405: }
4406:
4407: sub getFeedback {
4408: my $self = shift;
4409: my $source = $self->src();
4410: my $symb = $self->symb();
4411: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4412: return $self->{NAV_MAP}->getFeedback($symb,$source);
4413: }
4414:
4415: sub getErrors {
4416: my $self = shift;
4417: my $source = $self->src();
4418: my $symb = $self->symb();
4419: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4420: return $self->{NAV_MAP}->getErrors($symb,$source);
4421: }
4422:
4423: =pod
4424:
4425: =item * B<parts>():
4426:
4427: Returns a list reference containing sorted strings corresponding to
4428: each part of the problem. Single part problems have only a part '0'.
4429: Multipart problems do not return their part '0', since they typically
4430: do not really matter.
4431:
4432: =item * B<countParts>():
4433:
4434: Returns the number of parts of the problem a student can answer. Thus,
4435: for single part problems, returns 1. For multipart, it returns the
4436: number of parts in the problem, not including psuedo-part 0.
4437:
4438: =item * B<countResponses>():
4439:
4440: Returns the total number of responses in the problem a student can answer.
4441:
4442: =item * B<responseTypes>():
4443:
4444: Returns a hash whose keys are the response types. The values are the number
4445: of times each response type is used. This is for the I<entire> problem, not
4446: just a single part.
4447:
4448: =item * B<multipart>():
4449:
4450: Returns true if the problem is multipart, false otherwise. Use this instead
4451: of countParts if all you want is multipart/not multipart.
4452:
4453: =item * B<responseType>($part):
4454:
4455: Returns the response type of the part, without the word "response" on the
4456: end. Example return values: 'string', 'essay', 'numeric', etc.
4457:
4458: =item * B<responseIds>($part):
4459:
4460: Retreives the response IDs for the given part as an array reference containing
4461: strings naming the response IDs. This may be empty.
4462:
4463: =back
4464:
4465: =cut
4466:
4467: sub parts {
4468: my $self = shift;
4469:
4470: if ($self->ext) { return []; }
4471:
4472: $self->extractParts();
4473: return $self->{PARTS};
4474: }
4475:
4476: sub countParts {
4477: my $self = shift;
4478:
4479: my $parts = $self->parts();
4480:
4481: # If I left this here, then it's not necessary.
4482: #my $delta = 0;
4483: #for my $part (@$parts) {
4484: # if ($part eq '0') { $delta--; }
4485: #}
4486:
4487: if ($self->{RESOURCE_ERROR}) {
4488: return 0;
4489: }
4490:
4491: return scalar(@{$parts}); # + $delta;
4492: }
4493:
4494: sub countResponses {
4495: my $self = shift;
4496: my $count;
4497: foreach my $part (@{$self->parts()}) {
4498: $count+= scalar($self->responseIds($part));
4499: }
4500: return $count;
4501: }
4502:
4503: sub responseTypes {
4504: my $self = shift;
4505: my %responses;
4506: foreach my $part (@{$self->parts()}) {
4507: foreach my $responsetype ($self->responseType($part)) {
4508: $responses{$responsetype}++ if (defined($responsetype));
4509: }
4510: }
4511: return %responses;
4512: }
4513:
4514: sub multipart {
4515: my $self = shift;
4516: return $self->countParts() > 1;
4517: }
4518:
4519: sub singlepart {
4520: my $self = shift;
4521: return $self->countParts() == 1;
4522: }
4523:
4524: sub responseType {
4525: my $self = shift;
4526: my $part = shift;
4527:
4528: $self->extractParts();
4529: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4530: return @{$self->{RESPONSE_TYPES}->{$part}};
4531: } else {
4532: return undef;
4533: }
4534: }
4535:
4536: sub responseIds {
4537: my $self = shift;
4538: my $part = shift;
4539:
4540: $self->extractParts();
4541: if (defined($self->{RESPONSE_IDS}->{$part})) {
4542: return @{$self->{RESPONSE_IDS}->{$part}};
4543: } else {
4544: return undef;
4545: }
4546: }
4547:
4548: # Private function: Extracts the parts information, both part names and
4549: # part types, and saves it.
4550: sub extractParts {
4551: my $self = shift;
4552:
4553: return if (defined($self->{PARTS}));
4554: return if ($self->ext);
4555:
4556: $self->{PARTS} = [];
4557:
4558: my %parts;
4559:
4560: # Retrieve part count, if this is a problem
4561: if ($self->is_problem()) {
4562: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4563: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4564:
4565: if ($partorder) {
4566: my @parts;
4567: for my $part (split (/,/,$partorder)) {
4568: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4569: push @parts, $part;
4570: $parts{$part} = 1;
4571: }
4572: }
4573: $self->{PARTS} = \@parts;
4574: } else {
4575: if (!$metadata) {
4576: $self->{RESOURCE_ERROR} = 1;
4577: $self->{PARTS} = [];
4578: $self->{PART_TYPE} = {};
4579: return;
4580: }
4581: foreach my $entry (split(/\,/,$metadata)) {
4582: if ($entry =~ /^(?:part|Task)_(.*)$/) {
4583: my $part = $1;
4584: # This floods the logs if it blows up
4585: if (defined($parts{$part})) {
4586: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4587: }
4588:
4589: # check to see if part is turned off.
4590:
4591: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4592: $parts{$part} = 1;
4593: }
4594: }
4595: }
4596: my @sortedParts = sort keys %parts;
4597: $self->{PARTS} = \@sortedParts;
4598: }
4599:
4600:
4601: # These hashes probably do not need names that end with "Hash"....
4602: my %responseIdHash;
4603: my %responseTypeHash;
4604:
4605:
4606: # Init the responseIdHash
4607: foreach my $part (@{$self->{PARTS}}) {
4608: $responseIdHash{$part} = [];
4609: }
4610:
4611: # Now, the unfortunate thing about this is that parts, part name, and
4612: # response id are delimited by underscores, but both the part
4613: # name and response id can themselves have underscores in them.
4614: # So we have to use our knowlege of part names to figure out
4615: # where the part names begin and end, and even then, it is possible
4616: # to construct ambiguous situations.
4617: foreach my $data (split /,/, $metadata) {
4618: if ($data =~ /^([a-zA-Z]+)response_(.*)/
4619: || $data =~ /^(Task)_(.*)/) {
4620: my $responseType = $1;
4621: my $partStuff = $2;
4622: my $partIdSoFar = '';
4623: my @partChunks = split /_/, $partStuff;
4624: my $i = 0;
4625: for ($i = 0; $i < scalar(@partChunks); $i++) {
4626: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4627: $partIdSoFar .= $partChunks[$i];
4628: if ($parts{$partIdSoFar}) {
4629: my @otherChunks = @partChunks[$i+1..$#partChunks];
4630: my $responseId = join('_', @otherChunks);
4631: if ($self->is_task()) {
4632: push(@{$responseIdHash{$partIdSoFar}},
4633: $partIdSoFar);
4634: } else {
4635: push(@{$responseIdHash{$partIdSoFar}},
4636: $responseId);
4637: }
4638: push(@{$responseTypeHash{$partIdSoFar}},
4639: $responseType);
4640: }
4641: }
4642: }
4643: }
4644: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4645: #
4646: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4647: if ($resorder) {
4648: my @resorder=split(/,/,$resorder);
4649: foreach my $part (keys(%responseIdHash)) {
4650: my $i=0;
4651: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4652: my @neworder;
4653: foreach my $possibleid (@resorder) {
4654: if (exists($resids{$possibleid})) {
4655: push(@neworder,$resids{$possibleid});
4656: }
4657: }
4658: my @ids;
4659: my @type;
4660: foreach my $element (@neworder) {
4661: push (@ids,$responseIdHash{$part}->[$element]);
4662: push (@type,$responseTypeHash{$part}->[$element]);
4663: }
4664: $responseIdHash{$part}=\@ids;
4665: $responseTypeHash{$part}=\@type;
4666: }
4667: }
4668: $self->{RESPONSE_IDS} = \%responseIdHash;
4669: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4670: }
4671:
4672: return;
4673: }
4674:
4675: =pod
4676:
4677: =head2 Resource Status
4678:
4679: Problem resources have status information, reflecting their various
4680: dates and completion statuses.
4681:
4682: There are two aspects to the status: the date-related information and
4683: the completion information.
4684:
4685: Idiomatic usage of these two methods would probably look something
4686: like
4687:
4688: foreach my $part ($resource->parts()) {
4689: my $dateStatus = $resource->getDateStatus($part);
4690: my $completionStatus = $resource->getCompletionStatus($part);
4691:
4692: or
4693:
4694: my $status = $resource->status($part);
4695:
4696: ... use it here ...
4697: }
4698:
4699: Which you use depends on exactly what you are looking for. The
4700: status() function has been optimized for the nav maps display and may
4701: not precisely match what you need elsewhere.
4702:
4703: The symbolic constants shown below can be accessed through the
4704: resource object: C<$res->OPEN>.
4705:
4706: =over 4
4707:
4708: =item * B<getDateStatus>($part):
4709:
4710: ($part defaults to 0). A convenience function that returns a symbolic
4711: constant telling you about the date status of the part. The possible
4712: return values are:
4713:
4714: =back
4715:
4716: B<Date Codes>
4717:
4718: =over 4
4719:
4720: =item * B<OPEN_LATER>:
4721:
4722: The problem will be opened later.
4723:
4724: =item * B<OPEN>:
4725:
4726: Open and not yet due.
4727:
4728:
4729: =item * B<PAST_DUE_ANSWER_LATER>:
4730:
4731: The due date has passed, but the answer date has not yet arrived.
4732:
4733: =item * B<PAST_DUE_NO_ANSWER>:
4734:
4735: The due date has passed and there is no answer opening date set.
4736:
4737: =item * B<ANSWER_OPEN>:
4738:
4739: The answer date is here.
4740:
4741: =item * B<NETWORK_FAILURE>:
4742:
4743: The information is unknown due to network failure.
4744:
4745: =back
4746:
4747: =cut
4748:
4749: # Apparently the compiler optimizes these into constants automatically
4750: sub OPEN_LATER { return 0; }
4751: sub OPEN { return 1; }
4752: sub PAST_DUE_NO_ANSWER { return 2; }
4753: sub PAST_DUE_ANSWER_LATER { return 3; }
4754: sub ANSWER_OPEN { return 4; }
4755: sub NOTHING_SET { return 5; }
4756: sub NETWORK_FAILURE { return 100; }
4757:
4758: # getDateStatus gets the date status for a given problem part.
4759: # Because answer date, due date, and open date are fully independent
4760: # (i.e., it is perfectly possible to *only* have an answer date),
4761: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4762: # (past, future, none given). This function handles this with a decision
4763: # tree. Read the comments to follow the decision tree.
4764:
4765: sub getDateStatus {
4766: my $self = shift;
4767: my $part = shift;
4768: $part = "0" if (!defined($part));
4769:
4770: # Always return network failure if there was one.
4771: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4772:
4773: my $now = time();
4774:
4775: my $open = $self->opendate($part);
4776: my $due = $self->duedate($part);
4777: my $answer = $self->answerdate($part);
4778:
4779: if (!$open && !$due && !$answer) {
4780: # no data on the problem at all
4781: # should this be the same as "open later"? think multipart.
4782: return $self->NOTHING_SET;
4783: }
4784: if (!$open || $now < $open) {return $self->OPEN_LATER}
4785: if (!$due || $now < $due) {return $self->OPEN}
4786: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4787: if ($answer) { return $self->ANSWER_OPEN; }
4788: return PAST_DUE_NO_ANSWER;
4789: }
4790:
4791: =pod
4792:
4793: B<>
4794:
4795: =over 4
4796:
4797: =item * B<getCompletionStatus>($part):
4798:
4799: ($part defaults to 0.) A convenience function that returns a symbolic
4800: constant telling you about the completion status of the part, with the
4801: following possible results:
4802:
4803: =back
4804:
4805: B<Completion Codes>
4806:
4807: =over 4
4808:
4809: =item * B<NOT_ATTEMPTED>:
4810:
4811: Has not been attempted at all.
4812:
4813: =item * B<INCORRECT>:
4814:
4815: Attempted, but wrong by student.
4816:
4817: =item * B<INCORRECT_BY_OVERRIDE>:
4818:
4819: Attempted, but wrong by instructor override.
4820:
4821: =item * B<CORRECT>:
4822:
4823: Correct or correct by instructor.
4824:
4825: =item * B<CORRECT_BY_OVERRIDE>:
4826:
4827: Correct by instructor override.
4828:
4829: =item * B<EXCUSED>:
4830:
4831: Excused. Not yet implemented.
4832:
4833: =item * B<NETWORK_FAILURE>:
4834:
4835: Information not available due to network failure.
4836:
4837: =item * B<ATTEMPTED>:
4838:
4839: Attempted, and not yet graded.
4840:
4841: =item * B<CREDIT_ATTEMPTED>:
4842:
4843: Attempted, and credit received for attempt (survey and anonymous survey only).
4844:
4845: =back
4846:
4847: =cut
4848:
4849: sub NOT_ATTEMPTED { return 10; }
4850: sub INCORRECT { return 11; }
4851: sub INCORRECT_BY_OVERRIDE { return 12; }
4852: sub CORRECT { return 13; }
4853: sub CORRECT_BY_OVERRIDE { return 14; }
4854: sub EXCUSED { return 15; }
4855: sub ATTEMPTED { return 16; }
4856: sub CREDIT_ATTEMPTED { return 17; }
4857:
4858: sub getCompletionStatus {
4859: my $self = shift;
4860: my $part = shift;
4861: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4862:
4863: my $status = $self->queryRestoreHash('solved', $part);
4864:
4865: # Left as separate if statements in case we ever do more with this
4866: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4867: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4868: if ($status eq 'correct_by_override') {
4869: return $self->CORRECT_BY_OVERRIDE;
4870: }
4871: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4872: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4873: if ($status eq 'excused') {return $self->EXCUSED; }
4874: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4875: if ($status eq 'credit_attempted') {
4876: if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
4877: return $self->CREDIT_ATTEMPTED;
4878: } else {
4879: return $self->ATTEMPTED;
4880: }
4881: }
4882: return $self->NOT_ATTEMPTED;
4883: }
4884:
4885: sub queryRestoreHash {
4886: my $self = shift;
4887: my $hashentry = shift;
4888: my $part = shift;
4889: $part = "0" if (!defined($part) || $part eq '');
4890: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4891:
4892: $self->getReturnHash();
4893:
4894: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4895: }
4896:
4897: =pod
4898:
4899: B<Composite Status>
4900:
4901: Along with directly returning the date or completion status, the
4902: resource object includes a convenience function B<status>() that will
4903: combine the two status tidbits into one composite status that can
4904: represent the status of the resource as a whole. This method represents
4905: the concept of the thing we want to display to the user on the nav maps
4906: screen, which is a combination of completion and open status. The precise logic is
4907: documented in the comments of the status method. The following results
4908: may be returned, all available as methods on the resource object
4909: ($res->NETWORK_FAILURE): In addition to the return values that match
4910: the date or completion status, this function can return "ANSWER_SUBMITTED"
4911: if that problemstatus parameter value is set to No, suppressing the
4912: incorrect/correct feedback.
4913:
4914: =over 4
4915:
4916: =item * B<NETWORK_FAILURE>:
4917:
4918: The network has failed and the information is not available.
4919:
4920: =item * B<NOTHING_SET>:
4921:
4922: No dates have been set for this problem (part) at all. (Because only
4923: certain parts of a multi-part problem may be assigned, this can not be
4924: collapsed into "open later", as we do not know a given part will EVER
4925: be opened. For single part, this is the same as "OPEN_LATER".)
4926:
4927: =item * B<CORRECT>:
4928:
4929: For any reason at all, the part is considered correct.
4930:
4931: =item * B<EXCUSED>:
4932:
4933: For any reason at all, the problem is excused.
4934:
4935: =item * B<PAST_DUE_NO_ANSWER>:
4936:
4937: The problem is past due, not considered correct, and no answer date is
4938: set.
4939:
4940: =item * B<PAST_DUE_ANSWER_LATER>:
4941:
4942: The problem is past due, not considered correct, and an answer date in
4943: the future is set.
4944:
4945: =item * B<ANSWER_OPEN>:
4946:
4947: The problem is past due, not correct, and the answer is now available.
4948:
4949: =item * B<OPEN_LATER>:
4950:
4951: The problem is not yet open.
4952:
4953: =item * B<TRIES_LEFT>:
4954:
4955: The problem is open, has been tried, is not correct, but there are
4956: tries left.
4957:
4958: =item * B<INCORRECT>:
4959:
4960: The problem is open, and all tries have been used without getting the
4961: correct answer.
4962:
4963: =item * B<OPEN>:
4964:
4965: The item is open and not yet tried.
4966:
4967: =item * B<ATTEMPTED>:
4968:
4969: The problem has been attempted.
4970:
4971: =item * B<CREDIT_ATTEMPTED>:
4972:
4973: The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
4974:
4975: =item * B<ANSWER_SUBMITTED>:
4976:
4977: An answer has been submitted, but the student should not see it.
4978:
4979: =back
4980:
4981: =cut
4982:
4983: sub TRIES_LEFT { return 20; }
4984: sub ANSWER_SUBMITTED { return 21; }
4985: sub PARTIALLY_CORRECT { return 22; }
4986:
4987: sub RESERVED_LATER { return 30; }
4988: sub RESERVED { return 31; }
4989: sub RESERVED_LOCATION { return 32; }
4990: sub RESERVABLE { return 33; }
4991: sub RESERVABLE_LATER { return 34; }
4992: sub NOTRESERVABLE { return 35; }
4993: sub NOT_IN_A_SLOT { return 36; }
4994: sub NEEDS_CHECKIN { return 37; }
4995: sub WAITING_FOR_GRADE { return 38; }
4996: sub UNKNOWN { return 39; }
4997:
4998: sub status {
4999: my $self = shift;
5000: my $part = shift;
5001: if (!defined($part)) { $part = "0"; }
5002: my $completionStatus = $self->getCompletionStatus($part);
5003: my $dateStatus = $self->getDateStatus($part);
5004:
5005: # What we have is a two-dimensional matrix with 4 entries on one
5006: # dimension and 5 entries on the other, which we want to colorize,
5007: # plus network failure and "no date data at all".
5008:
5009: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
5010: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
5011:
5012: my $suppressFeedback = 0;
5013: if (($self->problemstatus($part) eq 'no') ||
5014: ($self->problemstatus($part) eq 'no_feedback_ever')) {
5015: $suppressFeedback = 1;
5016: }
5017: # If there's an answer date and we're past it, don't
5018: # suppress the feedback; student should know
5019: if ($self->duedate($part) && $self->duedate($part) < time() &&
5020: $self->answerdate($part) && $self->answerdate($part) < time()) {
5021: $suppressFeedback = 0;
5022: }
5023:
5024: # There are a few whole rows we can dispose of:
5025: if ($completionStatus == CORRECT ||
5026: $completionStatus == CORRECT_BY_OVERRIDE ) {
5027: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
5028: my $awarded=$self->awarded($part);
5029: if ($awarded < 1 && $awarded > 0) {
5030: return PARTIALLY_CORRECT;
5031: } elsif ($awarded<1) {
5032: return INCORRECT;
5033: }
5034: return CORRECT;
5035: }
5036:
5037: # If it's WRONG... and not open
5038: if ( ($completionStatus == INCORRECT ||
5039: $completionStatus == INCORRECT_BY_OVERRIDE)
5040: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
5041: return INCORRECT;
5042: }
5043:
5044: if ($completionStatus == ATTEMPTED) {
5045: return ATTEMPTED;
5046: }
5047:
5048: if ($completionStatus == CREDIT_ATTEMPTED) {
5049: return CREDIT_ATTEMPTED;
5050: }
5051:
5052: # If it's EXCUSED, then return that no matter what
5053: if ($completionStatus == EXCUSED) {
5054: return EXCUSED;
5055: }
5056:
5057: if ($dateStatus == NOTHING_SET) {
5058: return NOTHING_SET;
5059: }
5060:
5061: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
5062: # by 4 matrix (date statuses).
5063:
5064: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
5065: $dateStatus == PAST_DUE_NO_ANSWER ) {
5066: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
5067: }
5068:
5069: if ($dateStatus == ANSWER_OPEN) {
5070: return ANSWER_OPEN;
5071: }
5072:
5073: # Now: (incorrect, incorrect_override, not_attempted) x
5074: # (open_later), (open)
5075:
5076: if ($dateStatus == OPEN_LATER) {
5077: return OPEN_LATER;
5078: }
5079:
5080: # If it's WRONG...
5081: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
5082: # and there are TRIES LEFT:
5083: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5084: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
5085: }
5086: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
5087: }
5088:
5089: # Otherwise, it's untried and open
5090: return OPEN;
5091: }
5092:
5093: sub check_for_slot {
5094: my $self = shift;
5095: my $part = shift;
5096: my $symb = $self->symb();
5097: my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
5098: if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
5099: my @slots = (split(/:/,$availablestudent),split(/:/,$available));
5100: my $cid=$env{'request.course.id'};
5101: my $cdom=$env{'course.'.$cid.'.domain'};
5102: my $cnum=$env{'course.'.$cid.'.num'};
5103: my $now = time;
5104: my $num_usable_slots = 0;
5105: if (@slots > 0) {
5106: my %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
5107: if (&Apache::lonnet::error(%slots)) {
5108: return (UNKNOWN);
5109: }
5110: my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots,'starttime');
5111: my ($checkedin,$checkedinslot);
5112: foreach my $slot_name (@sorted_slots) {
5113: next if (!defined($slots{$slot_name}) || !ref($slots{$slot_name}));
5114: my $end = $slots{$slot_name}->{'endtime'};
5115: my $start = $slots{$slot_name}->{'starttime'};
5116: my $ip = $slots{$slot_name}->{'ip'};
5117: if ($self->simpleStatus() == OPEN) {
5118: if ($end > $now) {
5119: if ($start > $now) {
5120: return (RESERVED_LATER,$start,$slot_name);
5121: } else {
5122: if ($ip ne '') {
5123: if (!&Apache::loncommon::check_ip_acc($ip)) {
5124: return (RESERVED_LOCATION,$ip,$slot_name);
5125: }
5126: }
5127: my @proctors;
5128: if ($slots{$slot_name}->{'proctor'} ne '') {
5129: @proctors = split(',',$slots{$slot_name}->{'proctor'});
5130: }
5131: if (@proctors > 0) {
5132: ($checkedin,$checkedinslot) = $self->checkedin();
5133: unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
5134: ($checkedinslot eq $slot_name)) {
5135: return (NEEDS_CHECKIN,undef,$slot_name);
5136: }
5137: }
5138: return (RESERVED,$end,$slot_name);
5139: }
5140: }
5141: } elsif ($end > $now) {
5142: $num_usable_slots ++;
5143: }
5144: }
5145: my ($is_correct,$got_grade);
5146: if ($self->is_task()) {
5147: my $taskstatus = $self->taskstatus();
5148: $is_correct = (($taskstatus eq 'pass') ||
5149: ($self->solved() =~ /^correct_/));
5150: $got_grade = ($taskstatus =~ /^(?:pass|fail)$/);
5151: } else {
5152: $got_grade = 1;
5153: $is_correct = ($self->solved() =~ /^correct_/);
5154: }
5155: ($checkedin,$checkedinslot) = $self->checkedin();
5156: if ($checkedin) {
5157: if (!$got_grade) {
5158: return (WAITING_FOR_GRADE);
5159: } elsif ($is_correct) {
5160: return (CORRECT);
5161: }
5162: }
5163: if ($num_usable_slots) {
5164: return(NOT_IN_A_SLOT);
5165: }
5166: }
5167: my $reservable = &Apache::lonnet::get_reservable_slots($cnum,$cdom,$env{'user.name'},
5168: $env{'user.domain'});
5169: if (ref($reservable) eq 'HASH') {
5170: if ((ref($reservable->{'now_order'}) eq 'ARRAY') && (ref($reservable->{'now'}) eq 'HASH')) {
5171: foreach my $slot (reverse (@{$reservable->{'now_order'}})) {
5172: if (($reservable->{'now'}{$slot}{'symb'} eq '') ||
5173: ($reservable->{'now'}{$slot}{'symb'} eq $symb)) {
5174: return(RESERVABLE,$reservable->{'now'}{$slot}{'endreserve'});
5175: }
5176: }
5177: }
5178: if ((ref($reservable->{'future_order'}) eq 'ARRAY') && (ref($reservable->{'future'}) eq 'HASH')) {
5179: foreach my $slot (@{$reservable->{'future_order'}}) {
5180: if (($reservable->{'future'}{$slot}{'symb'} eq '') ||
5181: ($reservable->{'future'}{$slot}{'symb'} eq $symb)) {
5182: return(RESERVABLE_LATER,$reservable->{'future'}{$slot}{'startreserve'});
5183: }
5184: }
5185: }
5186: }
5187: return(NOTRESERVABLE);
5188: }
5189: return;
5190: }
5191:
5192: sub CLOSED { return 23; }
5193: sub ERROR { return 24; }
5194:
5195: =pod
5196:
5197: B<Simple Status>
5198:
5199: Convenience method B<simpleStatus> provides a "simple status" for the resource.
5200: "Simple status" corresponds to "which icon is shown on the
5201: Navmaps". There are six "simple" statuses:
5202:
5203: =over 4
5204:
5205: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
5206:
5207: =item * B<OPEN>: The problem is open and unattempted.
5208:
5209: =item * B<CORRECT>: The problem is correct for any reason.
5210:
5211: =item * B<INCORRECT>: The problem is incorrect and can still be
5212: completed successfully.
5213:
5214: =item * B<ATTEMPTED>: The problem has been attempted, but the student
5215: does not know if they are correct. (The ellipsis icon.)
5216:
5217: =item * B<ERROR>: There is an error retrieving information about this
5218: problem.
5219:
5220: =back
5221:
5222: =cut
5223:
5224: # This hash maps the composite status to this simple status, and
5225: # can be used directly, if you like
5226: my %compositeToSimple =
5227: (
5228: NETWORK_FAILURE() => ERROR,
5229: NOTHING_SET() => CLOSED,
5230: CORRECT() => CORRECT,
5231: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
5232: EXCUSED() => CORRECT,
5233: PAST_DUE_NO_ANSWER() => INCORRECT,
5234: PAST_DUE_ANSWER_LATER() => INCORRECT,
5235: ANSWER_OPEN() => INCORRECT,
5236: OPEN_LATER() => CLOSED,
5237: TRIES_LEFT() => OPEN,
5238: INCORRECT() => INCORRECT,
5239: OPEN() => OPEN,
5240: ATTEMPTED() => ATTEMPTED,
5241: CREDIT_ATTEMPTED() => CORRECT,
5242: ANSWER_SUBMITTED() => ATTEMPTED
5243: );
5244:
5245: sub simpleStatus {
5246: my $self = shift;
5247: my $part = shift;
5248: my $status = $self->status($part);
5249: return $compositeToSimple{$status};
5250: }
5251:
5252: =pod
5253:
5254: B<simpleStatusCount> will return an array reference containing, in
5255: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
5256: and ERROR parts the given problem has.
5257:
5258: =cut
5259:
5260: # This maps the status to the slot we want to increment
5261: my %statusToSlotMap =
5262: (
5263: OPEN() => 0,
5264: CLOSED() => 1,
5265: CORRECT() => 2,
5266: INCORRECT() => 3,
5267: ATTEMPTED() => 4,
5268: ERROR() => 5
5269: );
5270:
5271: sub statusToSlot { return $statusToSlotMap{shift()}; }
5272:
5273: sub simpleStatusCount {
5274: my $self = shift;
5275:
5276: my @counts = (0, 0, 0, 0, 0, 0, 0);
5277: foreach my $part (@{$self->parts()}) {
5278: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
5279: }
5280:
5281: return \@counts;
5282: }
5283:
5284: =pod
5285:
5286: B<Completable>
5287:
5288: The completable method represents the concept of I<whether the student can
5289: currently do the problem>. If the student can do the problem, which means
5290: that it is open, there are tries left, and if the problem is manually graded
5291: or the grade is suppressed via problemstatus, the student has not tried it
5292: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
5293: either the student has tried it and there is no feedback, or that for
5294: some reason it is no longer completable (not open yet, successfully completed,
5295: out of tries, etc.). As an example, this is used as the filter for the
5296: "Uncompleted Homework" option for the nav maps.
5297:
5298: If this does not quite meet your needs, do not fiddle with it (unless you are
5299: fixing it to better match the student's conception of "completable" because
5300: it's broken somehow)... make a new method.
5301:
5302: =cut
5303:
5304: sub completable {
5305: my $self = shift;
5306: if (!$self->is_problem()) { return 0; }
5307: my $partCount = $self->countParts();
5308:
5309: foreach my $part (@{$self->parts()}) {
5310: if ($part eq '0' && $partCount != 1) { next; }
5311: my $status = $self->status($part);
5312: # "If any of the parts are open, or have tries left (implies open),
5313: # and it is not "attempted" (manually graded problem), it is
5314: # not "complete"
5315: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5316: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5317: $status == ANSWER_SUBMITTED() ) {
5318: # did this part already, as well as we can
5319: next;
5320: }
5321: if ($status == OPEN() || $status == TRIES_LEFT()) {
5322: return 1;
5323: }
5324: }
5325:
5326: # If all the parts were complete, so was this problem.
5327: return 0;
5328: }
5329:
5330: =pod
5331:
5332: =head2 Resource/Nav Map Navigation
5333:
5334: =over 4
5335:
5336: =item * B<getNext>():
5337:
5338: Retreive an array of the possible next resources after this
5339: one. Always returns an array, even in the one- or zero-element case.
5340:
5341: =item * B<getPrevious>():
5342:
5343: Retreive an array of the possible previous resources from this
5344: one. Always returns an array, even in the one- or zero-element case.
5345:
5346: =cut
5347:
5348: sub getNext {
5349: my $self = shift;
5350: my @branches;
5351: my $to = $self->to();
5352: foreach my $branch ( split(/,/, $to) ) {
5353: my $choice = $self->{NAV_MAP}->getById($branch);
5354: #if (!$choice->condition()) { next; }
5355: my $next = $choice->goesto();
5356: $next = $self->{NAV_MAP}->getById($next);
5357:
5358: push @branches, $next;
5359: }
5360: return \@branches;
5361: }
5362:
5363: sub getPrevious {
5364: my $self = shift;
5365: my @branches;
5366: my $from = $self->from();
5367: foreach my $branch ( split /,/, $from) {
5368: my $choice = $self->{NAV_MAP}->getById($branch);
5369: my $prev = $choice->comesfrom();
5370: $prev = $self->{NAV_MAP}->getById($prev);
5371:
5372: push @branches, $prev;
5373: }
5374: return \@branches;
5375: }
5376:
5377: sub browsePriv {
5378: my $self = shift;
5379: if (defined($self->{BROWSE_PRIV})) {
5380: return $self->{BROWSE_PRIV};
5381: }
5382:
5383: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
5384: $self->symb());
5385: }
5386:
5387: =pod
5388:
5389: =back
5390:
5391: =cut
5392:
5393: 1;
5394:
5395: __END__
5396:
5397:
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