1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.476 2011/12/25 19:39:08 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_toolbar()
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: $result.='</form>';
1506: if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
1507: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1508: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
1509: if ($env{'course.'.$env{'request.course.id'}.'.url'} eq
1510: "uploaded/$cdom/$cnum/default.sequence") {
1511: &add_linkitem($args->{'linkitems'},'edittoplevel',
1512: "javascript:gocmd('/adm/coursedocs','direct');",
1513: 'Content Editor');
1514: }
1515: }
1516: }
1517:
1518: if ($args->{'caller'} eq 'navmapsdisplay') {
1519: $result .= &show_linkitems_toolbar($args,$condition);
1520: } elsif ($args->{'sort_html'}) {
1521: $result.=$args->{'sort_html'};
1522: }
1523:
1524: #$result .= "<br />\n";
1525: if ($r) {
1526: $r->print($result);
1527: $r->rflush();
1528: $result = "";
1529: }
1530: # End parameter setting
1531:
1532: $result .= "<br />\n";
1533:
1534: # Data
1535: $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");
1536:
1537: my $res = "Apache::lonnavmaps::resource";
1538: my %condenseStatuses =
1539: ( $res->NETWORK_FAILURE => 1,
1540: $res->NOTHING_SET => 1,
1541: $res->CORRECT => 1 );
1542:
1543: # Shared variables
1544: $args->{'counter'} = 0; # counts the rows
1545: $args->{'indentLevel'} = 0;
1546: $args->{'isNewBranch'} = 0;
1547: $args->{'condensed'} = 0;
1548:
1549: my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1550: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1551: $args->{'displayedHereMarker'} = 0;
1552:
1553: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1554: # since structure actually doesn't matter, except what map has what resources.
1555: if ($args->{'suppressEmptySequences'}) {
1556: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1557: $it->{FIRST_RESOURCE},
1558: $it->{FINISH_RESOURCE},
1559: {}, undef, 1);
1560: my $depth = 0;
1561: $dfsit->next();
1562: my $curRes = $dfsit->next();
1563: while ($depth > -1) {
1564: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1565: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1566:
1567: if (ref($curRes)) {
1568: # Parallel pre-processing: Do sequences have non-filtered-out children?
1569: if ($curRes->is_map()) {
1570: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1571: # Sequences themselves do not count as visible children,
1572: # unless those sequences also have visible children.
1573: # This means if a sequence appears, there's a "promise"
1574: # that there's something under it if you open it, somewhere.
1575: } else {
1576: # Not a sequence: if it's filtered, ignore it, otherwise
1577: # rise up the stack and mark the sequences as having children
1578: if (&$filterFunc($curRes)) {
1579: for my $sequence (@{$dfsit->getStack()}) {
1580: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1581: }
1582: }
1583: }
1584: }
1585: } continue {
1586: $curRes = $dfsit->next();
1587: }
1588: }
1589:
1590: my $displayedJumpMarker = 0;
1591: # Set up iteration.
1592: my $now = time();
1593: my $in24Hours = $now + 24 * 60 * 60;
1594: my $rownum = 0;
1595:
1596: # export "here" marker information
1597: $args->{'here'} = $here;
1598:
1599: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1600: my @resources;
1601: my $code='';# sub { !(shift->is_map();) };
1602: if ($args->{'sort'} eq 'title') {
1603: my $oldFilterFunc = $filterFunc;
1604: my $filterFunc=
1605: sub {
1606: my ($res)=@_;
1607: if ($res->is_map()) { return 0;}
1608: return &$oldFilterFunc($res);
1609: };
1610: @resources=$navmap->retrieveResources(undef,$filterFunc);
1611: @resources= sort { &cmp_title($a,$b) } @resources;
1612: } elsif ($args->{'sort'} eq 'duedate') {
1613: my $oldFilterFunc = $filterFunc;
1614: my $filterFunc=
1615: sub {
1616: my ($res)=@_;
1617: if (!$res->is_problem()) { return 0;}
1618: return &$oldFilterFunc($res);
1619: };
1620: @resources=$navmap->retrieveResources(undef,$filterFunc);
1621: @resources= sort {
1622: if ($a->duedate ne $b->duedate) {
1623: return $a->duedate cmp $b->duedate;
1624: }
1625: my $value=&cmp_title($a,$b);
1626: return $value;
1627: } @resources;
1628: } elsif ($args->{'sort'} eq 'discussion') {
1629: my $oldFilterFunc = $filterFunc;
1630: my $filterFunc=
1631: sub {
1632: my ($res)=@_;
1633: if (!$res->hasDiscussion() &&
1634: !$res->getFeedback() &&
1635: !$res->getErrors()) { return 0;}
1636: return &$oldFilterFunc($res);
1637: };
1638: @resources=$navmap->retrieveResources(undef,$filterFunc);
1639: @resources= sort { &cmp_title($a,$b) } @resources;
1640: } else {
1641: #unknow sort mechanism or default
1642: undef($args->{'sort'});
1643: }
1644:
1645:
1646: while (1) {
1647: if ($args->{'sort'}) {
1648: $curRes = shift(@resources);
1649: } else {
1650: $curRes = $it->next($closeAllPages);
1651:
1652: }
1653: if (!$curRes) { last; }
1654:
1655: # Maintain indentation level.
1656: if ($curRes == $it->BEGIN_MAP() ||
1657: $curRes == $it->BEGIN_BRANCH() ) {
1658: $args->{'indentLevel'}++;
1659: }
1660: if ($curRes == $it->END_MAP() ||
1661: $curRes == $it->END_BRANCH() ) {
1662: $args->{'indentLevel'}--;
1663: }
1664: # Notice new branches
1665: if ($curRes == $it->BEGIN_BRANCH()) {
1666: $args->{'isNewBranch'} = 1;
1667: }
1668:
1669: # If this isn't an actual resource, continue on
1670: if (!ref($curRes)) {
1671: next;
1672: }
1673:
1674: # If this has been filtered out, continue on
1675: if (!(&$filterFunc($curRes))) {
1676: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1677: next;
1678: }
1679:
1680: # If this is an empty sequence and we're filtering them, continue on
1681: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1682: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1683: next;
1684: }
1685:
1686: # If we're suppressing navmaps and this is a navmap, continue on
1687: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1688: next;
1689: }
1690:
1691: $args->{'counter'}++;
1692:
1693: # Does it have multiple parts?
1694: $args->{'multipart'} = 0;
1695: $args->{'condensed'} = 0;
1696: my @parts;
1697:
1698: # Decide what parts to show.
1699: if ($curRes->is_problem() && $showParts) {
1700: @parts = @{$curRes->parts()};
1701: $args->{'multipart'} = $curRes->multipart();
1702:
1703: if ($condenseParts) { # do the condensation
1704: if (!$args->{'condensed'}) {
1705: # Decide whether to condense based on similarity
1706: my $status = $curRes->status($parts[0]);
1707: my $due = $curRes->duedate($parts[0]);
1708: my $open = $curRes->opendate($parts[0]);
1709: my $statusAllSame = 1;
1710: my $dueAllSame = 1;
1711: my $openAllSame = 1;
1712: for (my $i = 1; $i < scalar(@parts); $i++) {
1713: if ($curRes->status($parts[$i]) != $status){
1714: $statusAllSame = 0;
1715: }
1716: if ($curRes->duedate($parts[$i]) != $due ) {
1717: $dueAllSame = 0;
1718: }
1719: if ($curRes->opendate($parts[$i]) != $open) {
1720: $openAllSame = 0;
1721: }
1722: }
1723: # $*allSame is true if all the statuses were
1724: # the same. Now, if they are all the same and
1725: # match one of the statuses to condense, or they
1726: # are all open with the same due date, or they are
1727: # all OPEN_LATER with the same open date, display the
1728: # status of the first non-zero part (to get the 'correct'
1729: # status right, since 0 is never 'correct' or 'open').
1730: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1731: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1732: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1733: @parts = ($parts[0]);
1734: $args->{'condensed'} = 1;
1735: }
1736: }
1737: # Multipart problem with one part: always "condense" (happens
1738: # to match the desirable behavior)
1739: if ($curRes->countParts() == 1) {
1740: @parts = ($parts[0]);
1741: $args->{'condensed'} = 1;
1742: }
1743: }
1744: }
1745:
1746: # If the multipart problem was condensed, "forget" it was multipart
1747: if (scalar(@parts) == 1) {
1748: $args->{'multipart'} = 0;
1749: } else {
1750: # Add part 0 so we display it correctly.
1751: unshift @parts, '0';
1752: }
1753:
1754: {
1755: my ($src,$symb,$anchor,$stack);
1756: if ($args->{'sort'}) {
1757: my $it = $navmap->getIterator(undef, undef, undef, 1);
1758: while ( my $res=$it->next()) {
1759: if (ref($res) &&
1760: $res->symb() eq $curRes->symb()) { last; }
1761: }
1762: $stack=$it->getStack();
1763: } else {
1764: $stack=$it->getStack();
1765: }
1766: ($src,$symb,$anchor)=getLinkForResource($stack);
1767: if (defined($anchor)) { $anchor='#'.$anchor; }
1768: my $srcHasQuestion = $src =~ /\?/;
1769: $args->{"resourceLink"} = $src.
1770: ($srcHasQuestion?'&':'?') .
1771: 'symb=' . &escape($symb).$anchor;
1772: }
1773: # Now, we've decided what parts to show. Loop through them and
1774: # show them.
1775: foreach my $part (@parts) {
1776: $rownum ++;
1777:
1778: $result .= &Apache::loncommon::start_data_table_row();
1779:
1780: # Set up some data about the parts that the cols might want
1781: my $filter = $it->{FILTER};
1782:
1783: # Now, display each column.
1784: foreach my $col (@$cols) {
1785: my $colHTML = '';
1786: if (ref($col)) {
1787: $colHTML .= &$col($curRes, $part, $args);
1788: } else {
1789: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1790: }
1791:
1792: # If this is the first column and it's time to print
1793: # the anchor, do so
1794: if ($col == $cols->[0] &&
1795: $args->{'counter'} == $args->{'currentJumpIndex'} -
1796: $currentJumpDelta) {
1797: # Jam the anchor after the <td> tag;
1798: # necessary for valid HTML (which Mozilla requires)
1799: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1800: $displayedJumpMarker = 1;
1801: }
1802: $result .= $colHTML . "\n";
1803: }
1804: $result .= &Apache::loncommon::end_data_table_row();
1805: $args->{'isNewBranch'} = 0;
1806: }
1807:
1808: if ($r && $rownum % 20 == 0) {
1809: $r->print($result);
1810: $result = "";
1811: $r->rflush();
1812: }
1813: } continue {
1814: if ($r) {
1815: # If we have the connection, make sure the user is still connected
1816: my $c = $r->connection;
1817: if ($c->aborted()) {
1818: # Who cares what we do, nobody will see it anyhow.
1819: return '';
1820: }
1821: }
1822: }
1823:
1824: # Print out the part that jumps to #curloc if it exists
1825: # delay needed because the browser is processing the jump before
1826: # it finishes rendering, so it goes to the wrong place!
1827: # onload might be better, but this routine has no access to that.
1828: # On mozilla, the 0-millisecond timeout seems to prevent this;
1829: # it's quite likely this might fix other browsers, too, and
1830: # certainly won't hurt anything.
1831: if ($displayedJumpMarker) {
1832: $result .= &Apache::lonhtmlcommon::scripttag("
1833: if (location.href.indexOf('#curloc')==-1) {
1834: setTimeout(\"location += '#curloc';\", 0)
1835: }
1836: ");
1837: }
1838:
1839: $result.=&Apache::loncommon::end_data_table();
1840:
1841: if ($r) {
1842: $r->print($result);
1843: $result = "";
1844: $r->rflush();
1845: }
1846:
1847: return $result;
1848: }
1849:
1850: sub add_linkitem {
1851: my ($linkitems,$name,$cmd,$text)=@_;
1852: $$linkitems{$name}{'cmd'}=$cmd;
1853: $$linkitems{$name}{'text'}=&mt($text);
1854: }
1855:
1856: sub show_linkitems_toolbar {
1857: my ($args,$condition) = @_;
1858: my $result =
1859: '<table><tr><td>'.
1860: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').
1861: '</td>'.
1862: '<td> </td>'.
1863: '<td class="LC_middle">'.&mt('Tools:').'</td>';
1864: if (ref($args) eq 'HASH') {
1865: if (ref($args->{'linkitems'}) eq 'HASH') {
1866: my @linkorder = ('firsthomework','everything','uncompleted',
1867: 'changefolder','clearbubbles','edittoplevel');
1868: $result .='<td align="left">'."\n".
1869: '<span class="LC_nobreak">'."\n".
1870: '<ul id="LC_toolbar">';
1871: foreach my $link (@linkorder) {
1872: my $link_id = 'LC_content_toolbar_'.$link;
1873: if (ref($args->{'linkitems'}{$link}) eq 'HASH') {
1874: if ($args->{'linkitems'}{$link}{'text'} ne '') {
1875: $args->{'linkitems'}{$link}{'cmd'}=~s/"/'/g;
1876: if ($args->{'linkitems'}{$link}{'cmd'}) {
1877: if ($link eq 'changefolder') {
1878: if ($condition) {
1879: $link_id='LC_content_toolbar_changefolder_toggled';
1880: } else {
1881: $link_id='LC_content_toolbar_changefolder';
1882: }
1883: }
1884: $result .= '<li><a href="#" '.
1885: 'onclick="'.$args->{'linkitems'}{$link}{'cmd'}.'" '.
1886: 'id="'.$link_id.'" '.
1887: 'class="LC_toolbarItem" '.
1888: 'title="'.$args->{'linkitems'}{$link}{'text'}.'">'.
1889: '</a></li>'."\n";
1890: }
1891: }
1892: }
1893: }
1894: $result .= '</ul>'.
1895: '</span></td>'."\n";
1896: }
1897: if ($args->{'sort_html'}) {
1898: $result .= '<td> </td><td> </td><td> </td>'.
1899: '<td align="right">'.$args->{'sort_html'}.'</td>';
1900: }
1901: }
1902: $result .= '</tr></table>';
1903: return $result;
1904: }
1905:
1906:
1907: 1;
1908:
1909:
1910:
1911:
1912:
1913:
1914:
1915:
1916:
1917: package Apache::lonnavmaps::navmap;
1918:
1919: =pod
1920:
1921: =head1 Object: Apache::lonnavmaps::navmap
1922:
1923: =head2 Overview
1924:
1925: The navmap object's job is to provide access to the resources
1926: in the course as Apache::lonnavmaps::resource objects, and to
1927: query and manage the relationship between those resource objects.
1928:
1929: Generally, you'll use the navmap object in one of three basic ways.
1930: In order of increasing complexity and power:
1931:
1932: =over 4
1933:
1934: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1935: various ways to obtain resource objects, based on various identifiers.
1936: Use this when you want to request information about one object or
1937: a handful of resources you already know the identities of, from some
1938: other source. For more about Ids, Symbs, and MapPcs, see the
1939: Resource documentation. Note that Url should be a B<last resort>,
1940: not your first choice; it only really works when there is only one
1941: instance of the resource in the course, which only applies to
1942: maps, and even that may change in the future (see the B<getResourceByUrl>
1943: documentation for more details.)
1944:
1945: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1946: retrieves resources matching some criterion and returns them
1947: in a flat array, with no structure information. Use this when
1948: you are manipulating a series of resources, based on what map
1949: the are in, but do not care about branching, or exactly how
1950: the maps and resources are related. This is the most common case.
1951:
1952: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1953: the course's navmap in various ways without writing the traversal
1954: code yourself. See iterator documentation below. Use this when
1955: you need to know absolutely everything about the course, including
1956: branches and the precise relationship between maps and resources.
1957:
1958: =back
1959:
1960: =head2 Creation And Destruction
1961:
1962: To create a navmap object, use the following function:
1963:
1964: =over 4
1965:
1966: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1967:
1968: Creates a new navmap object. Returns the navmap object if this is
1969: successful, or B<undef> if not.
1970:
1971: =back
1972:
1973: =head2 Methods
1974:
1975: =over 4
1976:
1977: =item * B<getIterator>(first, finish, filter, condition):
1978:
1979: See iterator documentation below.
1980:
1981: =cut
1982:
1983: use strict;
1984: use GDBM_File;
1985: use Apache::lonnet;
1986: use LONCAPA;
1987:
1988: sub new {
1989: # magic invocation to create a class instance
1990: my $proto = shift;
1991: my $class = ref($proto) || $proto;
1992: my $self = {};
1993: bless($self); # So we can call change_user if neceesary
1994:
1995: $self->{USERNAME} = shift || $env{'user.name'};
1996: $self->{DOMAIN} = shift || $env{'user.domain'};
1997:
1998:
1999:
2000: # Resource cache stores navmap resources as we reference them. We generate
2001: # them on-demand so we don't pay for creating resources unless we use them.
2002: $self->{RESOURCE_CACHE} = {};
2003:
2004: # Network failure flag, if we accessed the course or user opt and
2005: # failed
2006: $self->{NETWORK_FAILURE} = 0;
2007:
2008: # We can only tie the nav hash as done below if the username/domain
2009: # match the env one. Otherwise change_user does everything we need...since we can't
2010: # assume there are course hashes for the specific requested user@domamin:
2011: #
2012:
2013: if ( ($self->{USERNAME} eq $env{'user.name'}) && ($self->{DOMAIN} eq $env{'user.domain'})) {
2014:
2015: # tie the nav hash
2016:
2017: my %navmaphash;
2018: my %parmhash;
2019: my $courseFn = $env{"request.course.fn"};
2020: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2021: &GDBM_READER(), 0640))) {
2022: return undef;
2023: }
2024:
2025: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2026: &GDBM_READER(), 0640)))
2027: {
2028: untie %{$self->{PARM_HASH}};
2029: return undef;
2030: }
2031:
2032: $self->{NAV_HASH} = \%navmaphash;
2033: $self->{PARM_HASH} = \%parmhash;
2034: $self->{PARM_CACHE} = {};
2035: } else {
2036: $self->change_user($self->{USERNAME}, $self->{DOMAIN});
2037: }
2038:
2039: my $d = Data::Dumper->new([$self]);
2040:
2041: return $self;
2042: }
2043:
2044: #
2045: # In some instances it is useful to be able to dynamically change the
2046: # username/domain associated with a navmap (e.g. to navigate for someone
2047: # else besides the current user...if sufficiently privileged.
2048: # Parameters:
2049: # user - New user.
2050: # domain- Domain the user belongs to.
2051: # Implicit inputs:
2052: #
2053: sub change_user {
2054: my $self = shift;
2055: $self->{USERNAME} = shift;
2056: $self->{DOMAIN} = shift;
2057:
2058: # If the hashes are already tied make sure to break that bond:
2059:
2060: untie %{$self->{NAV_HASH}};
2061: untie %{$self->{PARM_HASH}};
2062:
2063: # The assumption is that we have to
2064: # use lonmap here to re-read the hash and from it reconstruct
2065: # new big and parameter hashes. An implicit assumption at this time
2066: # is that the course file is probably not created locally yet
2067: # an that we will therefore just read without tying.
2068:
2069: my ($cdom, $cnum) = split(/\_/, $env{'request.course.id'});
2070:
2071: my %big_hash;
2072: &Apache::lonmap::loadmap($cnum, $cdom, $self->{USERNAME}, $self->{DOMAIN}, \%big_hash);
2073: $self->{NAV_HASH} = \%big_hash;
2074:
2075:
2076:
2077: # Now clear the parm cache and reconstruct the parm hash fromt he big_hash
2078: # param.xxxx keys.
2079:
2080: $self->{PARM_CACHE} = {};
2081:
2082: my %parm_hash = {};
2083: foreach my $key (keys %big_hash) {
2084: if ($key =~ /^param\./) {
2085: my $param_key = $key;
2086: $param_key =~ s/^param\.//;
2087: $parm_hash{$param_key} = $big_hash{$key};
2088: }
2089: }
2090:
2091: $self->{PARM_HASH} = \%parm_hash;
2092:
2093:
2094:
2095:
2096: }
2097:
2098: sub generate_course_user_opt {
2099: my $self = shift;
2100: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2101:
2102: my $uname=$self->{USERNAME};
2103: my $udom=$self->{DOMAIN};
2104:
2105: my $cid=$env{'request.course.id'};
2106: my $cdom=$env{'course.'.$cid.'.domain'};
2107: my $cnum=$env{'course.'.$cid.'.num'};
2108:
2109: # ------------------------------------------------- Get coursedata (if present)
2110: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2111: # Check for network failure
2112: if (!ref($courseopt)) {
2113: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2114: $self->{NETWORK_FAILURE} = 1;
2115: }
2116: undef($courseopt);
2117: }
2118:
2119: # --------------------------------------------------- Get userdata (if present)
2120:
2121: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2122: # Check for network failure
2123: if (!ref($useropt)) {
2124: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2125: $self->{NETWORK_FAILURE} = 1;
2126: }
2127: undef($useropt);
2128: }
2129:
2130: $self->{COURSE_OPT} = $courseopt;
2131: $self->{USER_OPT} = $useropt;
2132:
2133: $self->{COURSE_USER_OPT_GENERATED} = 1;
2134:
2135: return;
2136: }
2137:
2138: sub generate_email_discuss_status {
2139: my $self = shift;
2140: my $symb = shift;
2141: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2142:
2143: my $cid=$env{'request.course.id'};
2144: my $cdom=$env{'course.'.$cid.'.domain'};
2145: my $cnum=$env{'course.'.$cid.'.num'};
2146:
2147: my %emailstatus = &Apache::lonnet::dump('email_status',$self->{DOMAIN},$self->{USERNAME});
2148: my $logoutTime = $emailstatus{'logout'};
2149: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2150: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2151: $courseLeaveTime : $logoutTime);
2152: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2153: $cdom, $cnum);
2154: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2155: $self->{DOMAIN},$self->{USERNAME},'lastread');
2156: my %lastreadtime = ();
2157: foreach my $key (keys %lastread) {
2158: my $shortkey = $key;
2159: $shortkey =~ s/_lastread$//;
2160: $lastreadtime{$shortkey} = $lastread{$key};
2161: }
2162:
2163: my %feedback=();
2164: my %error=();
2165: my @keys = &Apache::lonnet::getkeys('nohist_email',$self->{DOMAIN},
2166: $self->{USERNAME});
2167:
2168: foreach my $msgid (@keys) {
2169: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2170: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
2171: $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
2172: &Apache::lonenc::check_decrypt(\$symb);
2173: if (($fromcid ne '') && ($fromcid ne $cid)) {
2174: next;
2175: }
2176: if (defined($symb)) {
2177: if (defined($error) && $error == 1) {
2178: $error{$symb}.=','.$msgid;
2179: } else {
2180: $feedback{$symb}.=','.$msgid;
2181: }
2182: } else {
2183: my $plain=
2184: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
2185: if ($plain=~/ \[([^\]]+)\]\:/) {
2186: my $url=$1;
2187: if ($plain=~/\:Error \[/) {
2188: $error{$url}.=','.$msgid;
2189: } else {
2190: $feedback{$url}.=','.$msgid;
2191: }
2192: }
2193: }
2194: }
2195: }
2196:
2197: #symbs of resources that have feedbacks (will be urls pre-2.3)
2198: $self->{FEEDBACK} = \%feedback;
2199: #or errors (will be urls pre 2.3)
2200: $self->{ERROR_MSG} = \%error;
2201: $self->{DISCUSSION_TIME} = \%discussiontime;
2202: $self->{EMAIL_STATUS} = \%emailstatus;
2203: $self->{LAST_READ} = \%lastreadtime;
2204:
2205: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2206: }
2207:
2208: sub get_user_data {
2209: my $self = shift;
2210: if ($self->{RETRIEVED_USER_DATA}) { return; }
2211:
2212: # Retrieve performance data on problems
2213: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2214: $self->{DOMAIN},
2215: $self->{USERNAME});
2216: $self->{STUDENT_DATA} = \%student_data;
2217:
2218: $self->{RETRIEVED_USER_DATA} = 1;
2219: }
2220:
2221: sub get_discussion_data {
2222: my $self = shift;
2223: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2224: return $self->{DISCUSSION_DATA};
2225: }
2226:
2227: $self->generate_email_discuss_status();
2228:
2229: my $cid=$env{'request.course.id'};
2230: my $cdom=$env{'course.'.$cid.'.domain'};
2231: my $cnum=$env{'course.'.$cid.'.num'};
2232: # Retrieve discussion data for resources in course
2233: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
2234:
2235:
2236: $self->{DISCUSSION_DATA} = \%discussion_data;
2237: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2238: return $self->{DISCUSSION_DATA};
2239: }
2240:
2241:
2242: # Internal function: Takes a key to look up in the nav hash and implements internal
2243: # memory caching of that key.
2244: sub navhash {
2245: my $self = shift; my $key = shift;
2246: return $self->{NAV_HASH}->{$key};
2247: }
2248:
2249: =pod
2250:
2251: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2252: false otherwise. Undefined course maps indicate an error somewhere in
2253: LON-CAPA, and you will not be able to proceed with using the navmap.
2254: See the B<NAV> screen for an example of using this.
2255:
2256: =cut
2257:
2258: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2259: sub courseMapDefined {
2260: my $self = shift;
2261: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2262:
2263: my $firstres = $self->navhash("map_start_$uri");
2264: my $lastres = $self->navhash("map_finish_$uri");
2265: return $firstres && $lastres;
2266: }
2267:
2268: sub getIterator {
2269: my $self = shift;
2270: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2271: shift, undef, shift,
2272: shift, shift);
2273: return $iterator;
2274: }
2275:
2276: # Private method: Does the given resource (as a symb string) have
2277: # current discussion? Returns 0 if chat/mail data not extracted.
2278: sub hasDiscussion {
2279: my $self = shift;
2280: my $symb = shift;
2281: $self->generate_email_discuss_status();
2282:
2283: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2284:
2285: #return defined($self->{DISCUSSION_TIME}->{$symb});
2286:
2287: # backward compatibility (bulletin boards used to be 'wrapped')
2288: my $ressymb = $self->wrap_symb($symb);
2289: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2290: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2291: } else {
2292: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2293: 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).
2294: }
2295: }
2296:
2297: sub last_post_time {
2298: my $self = shift;
2299: my $symb = shift;
2300: my $ressymb = $self->wrap_symb($symb);
2301: return $self->{DISCUSSION_TIME}->{$ressymb};
2302: }
2303:
2304: sub discussion_info {
2305: my $self = shift;
2306: my $symb = shift;
2307: my $filter = shift;
2308:
2309: $self->get_discussion_data();
2310:
2311: my $ressymb = $self->wrap_symb($symb);
2312: # keys used to store bulletinboard postings use 'unwrapped' symb.
2313: my $discsymb = &escape($self->unwrap_symb($ressymb));
2314: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2315: if (!$version) { return; }
2316:
2317: my $prevread = $self->{LAST_READ}{$ressymb};
2318:
2319: my $count = 0;
2320: my $hiddenflag = 0;
2321: my $deletedflag = 0;
2322: my ($hidden,$deleted,%info);
2323:
2324: for (my $id=$version; $id>0; $id--) {
2325: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2326: my @keys=split(/:/,$vkeys);
2327: if (grep(/^hidden$/ ,@keys)) {
2328: if (!$hiddenflag) {
2329: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2330: $hiddenflag = 1;
2331: }
2332: } elsif (grep(/^deleted$/,@keys)) {
2333: if (!$deletedflag) {
2334: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2335: $deletedflag = 1;
2336: }
2337: } else {
2338: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2339: if ($filter eq 'unread') {
2340: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2341: next;
2342: }
2343: }
2344: $count++;
2345: $info{$count}{'subject'} =
2346: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2347: $info{$count}{'id'} = $id;
2348: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2349: }
2350: }
2351: }
2352: if (wantarray) {
2353: return ($count,%info);
2354: }
2355: return $count;
2356: }
2357:
2358: sub wrap_symb {
2359: my $self = shift;
2360: my $symb = shift;
2361: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2362: unless ($symb =~ m|adm/wrapper/adm|) {
2363: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2364: }
2365: }
2366: return $symb;
2367: }
2368:
2369: sub unwrap_symb {
2370: my $self = shift;
2371: my $ressymb = shift;
2372: my $discsymb = $ressymb;
2373: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2374: $discsymb = $1.$2;
2375: }
2376: return $discsymb;
2377: }
2378:
2379: # Private method: Does the given resource (as a symb string) have
2380: # current feedback? Returns the string in the feedback hash, which
2381: # will be false if it does not exist.
2382:
2383: sub getFeedback {
2384: my $self = shift;
2385: my $symb = shift;
2386: my $source = shift;
2387:
2388: $self->generate_email_discuss_status();
2389:
2390: if (!defined($self->{FEEDBACK})) { return ""; }
2391:
2392: my $feedback;
2393: if ($self->{FEEDBACK}->{$symb}) {
2394: $feedback = $self->{FEEDBACK}->{$symb};
2395: if ($self->{FEEDBACK}->{$source}) {
2396: $feedback .= ','.$self->{FEEDBACK}->{$source};
2397: }
2398: } else {
2399: if ($self->{FEEDBACK}->{$source}) {
2400: $feedback = $self->{FEEDBACK}->{$source};
2401: }
2402: }
2403: return $feedback;
2404: }
2405:
2406: # Private method: Get the errors for that resource (by source).
2407: sub getErrors {
2408: my $self = shift;
2409: my $symb = shift;
2410: my $src = shift;
2411:
2412: $self->generate_email_discuss_status();
2413:
2414: if (!defined($self->{ERROR_MSG})) { return ""; }
2415:
2416: my $errors;
2417: if ($self->{ERROR_MSG}->{$symb}) {
2418: $errors = $self->{ERROR_MSG}->{$symb};
2419: if ($self->{ERROR_MSG}->{$src}) {
2420: $errors .= ','.$self->{ERROR_MSG}->{$src};
2421: }
2422: } else {
2423: if ($self->{ERROR_MSG}->{$src}) {
2424: $errors = $self->{ERROR_MSG}->{$src};
2425: }
2426: }
2427: return $errors;
2428: }
2429:
2430: =pod
2431:
2432: =item * B<getById>(id):
2433:
2434: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2435: object for that resource. This method, or other methods that use it
2436: (as in the resource object) is the only proper way to obtain a
2437: resource object.
2438:
2439: =item * B<getBySymb>(symb):
2440:
2441: Based on the symb of the resource, get a resource object for that
2442: resource. This is one of the proper ways to get a resource object.
2443:
2444: =item * B<getByMapPc>(map_pc):
2445:
2446: Based on the map_pc of the resource, get a resource object for
2447: the given map. This is one of the proper ways to get a resource object.
2448:
2449: =cut
2450:
2451: # The strategy here is to cache the resource objects, and only construct them
2452: # as we use them. The real point is to prevent reading any more from the tied
2453: # hash than we have to, which should hopefully alleviate speed problems.
2454:
2455: sub getById {
2456: my $self = shift;
2457: my $id = shift;
2458:
2459: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2460: {
2461: return $self->{RESOURCE_CACHE}->{$id};
2462: }
2463:
2464: # resource handles inserting itself into cache.
2465: # Not clear why the quotes are necessary, but as of this
2466: # writing it doesn't work without them.
2467: return "Apache::lonnavmaps::resource"->new($self, $id);
2468: }
2469:
2470: sub getBySymb {
2471: my $self = shift;
2472: my $symb = shift;
2473:
2474: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2475: my $map = $self->getResourceByUrl($mapUrl);
2476: my $returnvalue = undef;
2477: if (ref($map)) {
2478: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2479: }
2480: return $returnvalue;
2481: }
2482:
2483: sub getByMapPc {
2484: my $self = shift;
2485: my $map_pc = shift;
2486: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2487: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2488: return $self->getById($map_id);
2489: }
2490:
2491: =pod
2492:
2493: =item * B<firstResource>():
2494:
2495: Returns a resource object reference corresponding to the first
2496: resource in the navmap.
2497:
2498: =cut
2499:
2500: sub firstResource {
2501: my $self = shift;
2502: my $firstResource = $self->navhash('map_start_' .
2503: &Apache::lonnet::clutter($env{'request.course.uri'}));
2504: return $self->getById($firstResource);
2505: }
2506:
2507: =pod
2508:
2509: =item * B<finishResource>():
2510:
2511: Returns a resource object reference corresponding to the last resource
2512: in the navmap.
2513:
2514: =cut
2515:
2516: sub finishResource {
2517: my $self = shift;
2518: my $firstResource = $self->navhash('map_finish_' .
2519: &Apache::lonnet::clutter($env{'request.course.uri'}));
2520: return $self->getById($firstResource);
2521: }
2522:
2523: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2524: # the actual lookup; parmval caches the results.
2525: sub parmval {
2526: my $self = shift;
2527: my ($what,$symb,$recurse)=@_;
2528: my $hashkey = $what."|||".$symb;
2529: my $cache = $self->{PARM_CACHE};
2530: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2531: if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') {
2532: if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
2533: if (wantarray) {
2534: return @{$self->{PARM_CACHE}->{$hashkey}};
2535: } else {
2536: return $self->{PARM_CACHE}->{$hashkey}->[0];
2537: }
2538: }
2539: } else {
2540: return $self->{PARM_CACHE}->{$hashkey};
2541: }
2542: }
2543: my $result = $self->parmval_real($what, $symb, $recurse);
2544: $self->{PARM_CACHE}->{$hashkey} = $result;
2545: if (wantarray) {
2546: return @{$result};
2547: }
2548: return $result->[0];
2549: }
2550:
2551: sub parmval_real {
2552: my $self = shift;
2553: my ($what,$symb,$recurse) = @_;
2554:
2555: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2556: $self->generate_course_user_opt();
2557:
2558: my $cid=$env{'request.course.id'};
2559: my $csec=$env{'request.course.sec'};
2560: my $cgroup='';
2561: my @cgrps=split(/:/,$env{'request.course.groups'});
2562: if (@cgrps > 0) {
2563: @cgrps = sort(@cgrps);
2564: $cgroup = $cgrps[0];
2565: }
2566: my $uname=$self->{USERNAME};
2567: my $udom=$self->{DOMAIN};
2568:
2569: unless ($symb) { return ['']; }
2570: my $result='';
2571:
2572: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2573: $mapname = &Apache::lonnet::deversion($mapname);
2574: # ----------------------------------------------------- Cascading lookup scheme
2575: my $rwhat=$what;
2576: $what=~s/^parameter\_//;
2577: $what=~s/\_/\./;
2578:
2579: my $symbparm=$symb.'.'.$what;
2580: my $mapparm=$mapname.'___(all).'.$what;
2581: my $usercourseprefix=$cid;
2582:
2583: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2584: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2585: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2586:
2587: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2588: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2589: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2590:
2591: my $courselevel= $usercourseprefix.'.'.$what;
2592: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2593: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2594:
2595: my $useropt = $self->{USER_OPT};
2596: my $courseopt = $self->{COURSE_OPT};
2597: my $parmhash = $self->{PARM_HASH};
2598:
2599: # ---------------------------------------------------------- first, check user
2600: if ($uname and defined($useropt)) {
2601: if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
2602: if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
2603: if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
2604: }
2605:
2606: # ------------------------------------------------------- second, check course
2607: if ($cgroup ne '' and defined($courseopt)) {
2608: if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
2609: if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
2610: if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
2611: }
2612:
2613: if ($csec and defined($courseopt)) {
2614: if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
2615: if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
2616: if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
2617: }
2618:
2619: if (defined($courseopt)) {
2620: if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
2621: }
2622:
2623: # ----------------------------------------------------- third, check map parms
2624:
2625: my $thisparm=$$parmhash{$symbparm};
2626: if (defined($thisparm)) { return [$thisparm,'map']; }
2627:
2628: # ----------------------------------------------------- fourth , check default
2629:
2630: my $meta_rwhat=$rwhat;
2631: $meta_rwhat=~s/\./_/g;
2632: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2633: if (defined($default)) { return [$default,'resource']}
2634: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2635: if (defined($default)) { return [$default,'resource']}
2636: # --------------------------------------------------- fifth, check more course
2637: if (defined($courseopt)) {
2638: if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
2639: if (defined($$courseopt{$courselevel})) {
2640: my $ret = [$$courseopt{$courselevel},'course'];
2641: return $ret;
2642: }
2643: }
2644: # --------------------------------------------------- sixth , cascade up parts
2645:
2646: my ($space,@qualifier)=split(/\./,$rwhat);
2647: my $qualifier=join('.',@qualifier);
2648: unless ($space eq '0') {
2649: my @parts=split(/_/,$space);
2650: my $id=pop(@parts);
2651: my $part=join('_',@parts);
2652: if ($part eq '') { $part='0'; }
2653: my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2654: if (defined($partgeneral[0])) { return \@partgeneral; }
2655: }
2656: if ($recurse) { return []; }
2657: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2658: if (defined($pack_def)) { return [$pack_def,'resource']; }
2659: return [''];
2660: }
2661:
2662: =pod
2663:
2664: =item * B<getResourceByUrl>(url,multiple):
2665:
2666: Retrieves a resource object by URL of the resource, unless the optional
2667: multiple parameter is included in which case an array of resource
2668: objects is returned. If passed a resource object, it will simply return
2669: it, so it is safe to use this method in code like
2670: "$res = $navmap->getResourceByUrl($res)"
2671: if you're not sure if $res is already an object, or just a URL. If the
2672: resource appears multiple times in the course, only the first instance
2673: will be returned (useful for maps), unless the multiple parameter has
2674: been included, in which case all instances are returned in an array.
2675:
2676: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2677:
2678: The map is a specification of a map to retreive the resources from,
2679: either as a url or as an object. The filterFunc is a reference to a
2680: function that takes a resource object as its one argument and returns
2681: true if the resource should be included, or false if it should not
2682: be. If recursive is true, the map will be recursively examined,
2683: otherwise it will not be. If bailout is true, the function will return
2684: as soon as it finds a resource, if false it will finish. If showall is
2685: true it will not hide maps that contain nothing but one other map. By
2686: default, the map is the top-level map of the course, filterFunc is a
2687: function that always returns 1, recursive is true, bailout is false,
2688: showall is false. The resources will be returned in a list containing
2689: the resource objects for the corresponding resources, with B<no
2690: structure information> in the list; regardless of branching,
2691: recursion, etc., it will be a flat list.
2692:
2693: Thus, this is suitable for cases where you don't want the structure,
2694: just a list of all resources. It is also suitable for finding out how
2695: many resources match a given description; for this use, if all you
2696: want to know is if I<any> resources match the description, the bailout
2697: parameter will allow you to avoid potentially expensive enumeration of
2698: all matching resources.
2699:
2700: =item * B<hasResource>(map, filterFunc, recursive, showall):
2701:
2702: Convenience method for
2703:
2704: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2705:
2706: which will tell whether the map has resources matching the description
2707: in the filter function.
2708:
2709: =item * B<usedVersion>(url):
2710:
2711: Retrieves version infomation for a url. Returns the version (a number, or
2712: the string "mostrecent") for resources which have version information in
2713: the big hash.
2714:
2715: =cut
2716:
2717:
2718: sub getResourceByUrl {
2719: my $self = shift;
2720: my $resUrl = shift;
2721: my $multiple = shift;
2722:
2723: if (ref($resUrl)) { return $resUrl; }
2724:
2725: $resUrl = &Apache::lonnet::clutter($resUrl);
2726: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2727: if (!$resId) { return ''; }
2728: if ($multiple) {
2729: my @resources = ();
2730: my @resIds = split (/,/, $resId);
2731: foreach my $id (@resIds) {
2732: my $resourceId = $self->getById($id);
2733: if ($resourceId) {
2734: push(@resources,$resourceId);
2735: }
2736: }
2737: return @resources;
2738: } else {
2739: if ($resId =~ /,/) {
2740: $resId = (split (/,/, $resId))[0];
2741: }
2742: return $self->getById($resId);
2743: }
2744: }
2745:
2746: sub retrieveResources {
2747: my $self = shift;
2748: my $map = shift;
2749: my $filterFunc = shift;
2750: if (!defined ($filterFunc)) {
2751: $filterFunc = sub {return 1;};
2752: }
2753: my $recursive = shift;
2754: if (!defined($recursive)) { $recursive = 1; }
2755: my $bailout = shift;
2756: if (!defined($bailout)) { $bailout = 0; }
2757: my $showall = shift;
2758: # Create the necessary iterator.
2759: if (!ref($map)) { # assume it's a url of a map.
2760: $map = $self->getResourceByUrl($map);
2761: }
2762:
2763: # If nothing was passed, assume top-level map
2764: if (!$map) {
2765: $map = $self->getById('0.0');
2766: }
2767:
2768: # Check the map's validity.
2769: if (!$map->is_map()) {
2770: # Oh, to throw an exception.... how I'd love that!
2771: return ();
2772: }
2773:
2774: # Get an iterator.
2775: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2776: undef, $recursive, $showall);
2777:
2778: my @resources = ();
2779:
2780: if (&$filterFunc($map)) {
2781: push(@resources, $map);
2782: }
2783:
2784: # Run down the iterator and collect the resources.
2785: my $curRes;
2786:
2787: while ($curRes = $it->next()) {
2788: if (ref($curRes)) {
2789: if (!&$filterFunc($curRes)) {
2790: next;
2791: }
2792:
2793: push(@resources, $curRes);
2794:
2795: if ($bailout) {
2796: return @resources;
2797: }
2798: }
2799:
2800: }
2801:
2802: return @resources;
2803: }
2804:
2805: sub hasResource {
2806: my $self = shift;
2807: my $map = shift;
2808: my $filterFunc = shift;
2809: my $recursive = shift;
2810: my $showall = shift;
2811:
2812: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2813: }
2814:
2815: sub usedVersion {
2816: my $self = shift;
2817: my $linkurl = shift;
2818: return $self->navhash("version_$linkurl");
2819: }
2820:
2821: 1;
2822:
2823: package Apache::lonnavmaps::iterator;
2824: use Scalar::Util qw(weaken);
2825: use Apache::lonnet;
2826:
2827: =pod
2828:
2829: =back
2830:
2831: =head1 Object: navmap Iterator
2832:
2833: An I<iterator> encapsulates the logic required to traverse a data
2834: structure. navmap uses an iterator to traverse the course map
2835: according to the criteria you wish to use.
2836:
2837: To obtain an iterator, call the B<getIterator>() function of a
2838: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2839: directly.) This will return a reference to the iterator:
2840:
2841: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2842:
2843: To get the next thing from the iterator, call B<next>:
2844:
2845: C<my $nextThing = $resourceIterator-E<gt>next()>
2846:
2847: getIterator behaves as follows:
2848:
2849: =over 4
2850:
2851: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2852:
2853: All parameters are optional. firstResource is a resource reference
2854: corresponding to where the iterator should start. It defaults to
2855: navmap->firstResource() for the corresponding nav map. finishResource
2856: corresponds to where you want the iterator to end, defaulting to
2857: navmap->finishResource(). filterHash is a hash used as a set
2858: containing strings representing the resource IDs, defaulting to
2859: empty. Condition is a 1 or 0 that sets what to do with the filter
2860: hash: If a 0, then only resources that exist IN the filterHash will be
2861: recursed on. If it is a 1, only resources NOT in the filterHash will
2862: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2863: false (default), the iterator will only return the first level of map
2864: that is not just a single, 'redirecting' map. If true, the iterator
2865: will return all information, starting with the top-level map,
2866: regardless of content. returnTopMap, if true (default false), will
2867: cause the iterator to return the top-level map object (resource 0.0)
2868: before anything else.
2869:
2870: Thus, by default, only top-level resources will be shown. Change the
2871: condition to a 1 without changing the hash, and all resources will be
2872: shown. Changing the condition to 1 and including some values in the
2873: hash will allow you to selectively suppress parts of the navmap, while
2874: leaving it on 0 and adding things to the hash will allow you to
2875: selectively add parts of the nav map. See the handler code for
2876: examples.
2877:
2878: The iterator will return either a reference to a resource object, or a
2879: token representing something in the map, such as the beginning of a
2880: new branch. The possible tokens are:
2881:
2882: =over 4
2883:
2884: =item * B<END_ITERATOR>:
2885:
2886: The iterator has returned all that it's going to. Further calls to the
2887: iterator will just produce more of these. This is a "false" value, and
2888: is the only false value the iterator which will be returned, so it can
2889: be used as a loop sentinel.
2890:
2891: =item * B<BEGIN_MAP>:
2892:
2893: A new map is being recursed into. This is returned I<after> the map
2894: resource itself is returned.
2895:
2896: =item * B<END_MAP>:
2897:
2898: The map is now done.
2899:
2900: =item * B<BEGIN_BRANCH>:
2901:
2902: A branch is now starting. The next resource returned will be the first
2903: in that branch.
2904:
2905: =item * B<END_BRANCH>:
2906:
2907: The branch is now done.
2908:
2909: =back
2910:
2911: The tokens are retreivable via methods on the iterator object, i.e.,
2912: $iterator->END_MAP.
2913:
2914: Maps can contain empty resources. The iterator will automatically skip
2915: over such resources, but will still treat the structure
2916: correctly. Thus, a complicated map with several branches, but
2917: consisting entirely of empty resources except for one beginning or
2918: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2919: but only one resource will be returned.
2920:
2921: =back
2922:
2923: =head2 Normal Usage
2924:
2925: Normal usage of the iterator object is to do the following:
2926:
2927: my $it = $navmap->getIterator([your params here]);
2928: my $curRes;
2929: while ($curRes = $it->next()) {
2930: [your logic here]
2931: }
2932:
2933: Note that inside of the loop, it's frequently useful to check if
2934: "$curRes" is a reference or not with the reference function; only
2935: resource objects will be references, and any non-references will
2936: be the tokens described above.
2937:
2938: Also note there is some old code floating around that trys to track
2939: the depth of the iterator to see when it's done; do not copy that
2940: code. It is difficult to get right and harder to understand than
2941: this. They should be migrated to this new style.
2942:
2943: =cut
2944:
2945: # Here are the tokens for the iterator:
2946:
2947: sub END_ITERATOR { return 0; }
2948: sub BEGIN_MAP { return 1; } # begining of a new map
2949: sub END_MAP { return 2; } # end of the map
2950: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2951: sub END_BRANCH { return 4; } # end of a branch
2952: sub FORWARD { return 1; } # go forward
2953: sub BACKWARD { return 2; }
2954:
2955: sub min {
2956: (my $a, my $b) = @_;
2957: if ($a < $b) { return $a; } else { return $b; }
2958: }
2959:
2960: sub new {
2961: # magic invocation to create a class instance
2962: my $proto = shift;
2963: my $class = ref($proto) || $proto;
2964: my $self = {};
2965:
2966: weaken($self->{NAV_MAP} = shift);
2967: return undef unless ($self->{NAV_MAP});
2968:
2969: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
2970: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
2971:
2972: # Handle the parameters
2973: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2974: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2975:
2976: # If the given resources are just the ID of the resource, get the
2977: # objects
2978: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2979: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2980: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2981: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2982:
2983: $self->{FILTER} = shift;
2984:
2985: # A hash, used as a set, of resource already seen
2986: $self->{ALREADY_SEEN} = shift;
2987: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2988: $self->{CONDITION} = shift;
2989:
2990: # Do we want to automatically follow "redirection" maps?
2991: $self->{FORCE_TOP} = shift;
2992:
2993: # Do we want to return the top-level map object (resource 0.0)?
2994: $self->{RETURN_0} = shift;
2995: # have we done that yet?
2996: $self->{HAVE_RETURNED_0} = 0;
2997:
2998: # Now, we need to pre-process the map, by walking forward and backward
2999: # over the parts of the map we're going to look at.
3000:
3001: # The processing steps are exactly the same, except for a few small
3002: # changes, so I bundle those up in the following list of two elements:
3003: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
3004: # first_resource).
3005: # This prevents writing nearly-identical code twice.
3006: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
3007: 'FIRST_RESOURCE'],
3008: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
3009: 'FINISH_RESOURCE'] );
3010:
3011: my $maxDepth = 0; # tracks max depth
3012:
3013: # If there is only one resource in this map, and it's a map, we
3014: # want to remember that, so the user can ask for the first map
3015: # that isn't just a redirector.
3016: my $resource; my $resourceCount = 0;
3017:
3018: # Documentation on this algorithm can be found in the CVS repository at
3019: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
3020: # in that file.
3021: # **1**
3022:
3023: foreach my $pass (@iterations) {
3024: my $direction = $pass->[0];
3025: my $valName = $pass->[1];
3026: my $nextResourceMethod = $pass->[2];
3027: my $firstResourceName = $pass->[3];
3028:
3029: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
3030: $self->{FIRST_RESOURCE},
3031: $self->{FINISH_RESOURCE},
3032: {}, undef, 0, $direction);
3033:
3034: # prime the recursion
3035: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
3036: $iterator->next();
3037: my $curRes = $iterator->next();
3038: my $depth = 1;
3039: while ($depth > 0) {
3040: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
3041: if ($curRes == $iterator->END_MAP()) { $depth--; }
3042:
3043: if (ref($curRes)) {
3044: # If there's only one resource, this will save it
3045: # we have to filter empty resources from consideration here,
3046: # or even "empty", redirecting maps have two (start & finish)
3047: # or three (start, finish, plus redirector)
3048: if($direction == FORWARD && $curRes->src()) {
3049: $resource = $curRes; $resourceCount++;
3050: }
3051: my $resultingVal = $curRes->{DATA}->{$valName};
3052: my $nextResources = $curRes->$nextResourceMethod();
3053: my $nextCount = scalar(@{$nextResources});
3054:
3055: if ($nextCount == 1) { # **3**
3056: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
3057: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
3058: }
3059:
3060: if ($nextCount > 1) { # **4**
3061: foreach my $res (@{$nextResources}) {
3062: my $current = $res->{DATA}->{$valName} || 999999999;
3063: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
3064: }
3065: }
3066: }
3067:
3068: # Assign the final val (**2**)
3069: if (ref($curRes) && $direction == BACKWARD()) {
3070: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
3071: $curRes->{DATA}->{BOT_UP_VAL});
3072:
3073: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
3074: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
3075: }
3076:
3077: $curRes = $iterator->next();
3078: }
3079: }
3080:
3081: # Check: Was this only one resource, a map?
3082: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
3083: my $firstResource = $resource->map_start();
3084: my $finishResource = $resource->map_finish();
3085: my $result;
3086: my $rdump = Data::Dumper->new([$result]);
3087: $result = Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3088: $finishResource, $self->{FILTER},
3089: $self->{ALREADY_SEEN},
3090: $self->{CONDITION},
3091: $self->{FORCE_TOP});
3092: return $result;
3093:
3094:
3095: }
3096:
3097: # Set up some bookkeeping information.
3098: $self->{CURRENT_DEPTH} = 0;
3099: $self->{MAX_DEPTH} = $maxDepth;
3100: $self->{STACK} = [];
3101: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3102: $self->{FINISHED} = 0; # When true, the iterator has finished
3103:
3104: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
3105: push @{$self->{STACK}}, [];
3106: }
3107:
3108: # Prime the recursion w/ the first resource **5**
3109: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3110: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3111:
3112: bless ($self);
3113: my $selfDump = Data::Dumper->new([$self]);
3114:
3115: return $self;
3116: }
3117:
3118: sub next {
3119: my $self = shift;
3120: my $closeAllPages=shift;
3121: if ($self->{FINISHED}) {
3122: return END_ITERATOR();
3123: }
3124:
3125: # If we want to return the top-level map object, and haven't yet,
3126: # do so.
3127: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3128: $self->{HAVE_RETURNED_0} = 1;
3129: my $nextTopLevel = $self->{NAV_MAP}->getById('0.0');
3130:
3131: return $self->{NAV_MAP}->getById('0.0');
3132: }
3133: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
3134: $self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
3135: return $self->BEGIN_MAP();
3136: }
3137:
3138: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3139: # grab the next from the recursive iterator
3140: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3141:
3142: # is it a begin or end map? If so, update the depth
3143: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3144: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3145:
3146: # Are we back at depth 0? If so, stop recursing
3147: if ($self->{RECURSIVE_DEPTH} == 0) {
3148: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3149: }
3150: return $next;
3151: }
3152:
3153: if (defined($self->{FORCE_NEXT})) {
3154: my $tmp = $self->{FORCE_NEXT};
3155: $self->{FORCE_NEXT} = undef;
3156:
3157: return $tmp;
3158: }
3159:
3160: # Have we not yet begun? If not, return BEGIN_MAP and
3161: # remember we've started.
3162: if ( !$self->{STARTED} ) {
3163: $self->{STARTED} = 1;
3164: return $self->BEGIN_MAP();
3165: }
3166:
3167: # Here's the guts of the iterator.
3168:
3169: # Find the next resource, if any.
3170: my $found = 0;
3171: my $i = $self->{MAX_DEPTH};
3172: my $newDepth;
3173: my $here;
3174: while ( $i >= 0 && !$found ) {
3175: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3176: $here = pop @{$self->{STACK}->[$i]}; # **7**
3177: $found = 1;
3178: $newDepth = $i;
3179: }
3180: $i--;
3181: }
3182:
3183: # If we still didn't find anything, we're done.
3184: if ( !$found ) {
3185: # We need to get back down to the correct branch depth
3186: if ( $self->{CURRENT_DEPTH} > 0 ) {
3187: $self->{CURRENT_DEPTH}--;
3188: return END_BRANCH();
3189: } else {
3190: $self->{FINISHED} = 1;
3191: return END_MAP();
3192: }
3193: }
3194:
3195: # If this is not a resource, it must be an END_BRANCH marker we want
3196: # to return directly.
3197: if (!ref($here)) { # **8**
3198: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3199: $self->{CURRENT_DEPTH}--;
3200: return $here;
3201: }
3202: }
3203:
3204: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3205: $self->{HERE} = $here;
3206:
3207: # Get to the right level
3208: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3209: push @{$self->{STACK}->[$newDepth]}, $here;
3210: $self->{CURRENT_DEPTH}--;
3211: return END_BRANCH();
3212: }
3213: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3214: push @{$self->{STACK}->[$newDepth]}, $here;
3215: $self->{CURRENT_DEPTH}++;
3216: return BEGIN_BRANCH();
3217: }
3218:
3219: # If we made it here, we have the next resource, and we're at the
3220: # right branch level. So let's examine the resource for where
3221: # we can get to from here.
3222:
3223: # So we need to look at all the resources we can get to from here,
3224: # categorize them if we haven't seen them, remember if we have a new
3225: my $nextUnfiltered = $here->getNext();
3226:
3227:
3228: my $maxDepthAdded = -1;
3229:
3230: for (@$nextUnfiltered) {
3231: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3232: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3233: push @{$self->{STACK}->[$depth]}, $_;
3234: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3235: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3236: }
3237: }
3238:
3239: # Is this the end of a branch? If so, all of the resources examined above
3240: # led to lower levels than the one we are currently at, so we push a END_BRANCH
3241: # marker onto the stack so we don't forget.
3242: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3243: # BC branch and gets to C, it will see F as the only next resource, but it's
3244: # one level lower. Thus, this is the end of the branch, since there are no
3245: # more resources added to this level or above.
3246: # We don't do this if the examined resource is the finish resource,
3247: # because the condition given above is true, but the "END_MAP" will
3248: # take care of things and we should already be at depth 0.
3249: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3250: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3251: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3252: }
3253:
3254: # That ends the main iterator logic. Now, do we want to recurse
3255: # down this map (if this resource is a map)?
3256: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3257: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3258: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3259: my $firstResource = $self->{HERE}->map_start();
3260: my $finishResource = $self->{HERE}->map_finish();
3261: $self->{RECURSIVE_ITERATOR} =
3262: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3263: $finishResource, $self->{FILTER},
3264: $self->{ALREADY_SEEN},
3265: $self->{CONDITION},
3266: $self->{FORCE_TOP});
3267: }
3268:
3269: # If this is a blank resource, don't actually return it.
3270: # Should you ever find you need it, make sure to add an option to the code
3271: # that you can use; other things depend on this behavior.
3272: my $browsePriv = $self->{HERE}->browsePriv();
3273: if (!$self->{HERE}->src() ||
3274: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3275: return $self->next($closeAllPages);
3276: }
3277:
3278: my $hereResource = $self->{HERE};
3279:
3280: return $self->{HERE};
3281:
3282: }
3283:
3284: =pod
3285:
3286: The other method available on the iterator is B<getStack>, which
3287: returns an array populated with the current 'stack' of maps, as
3288: references to the resource objects. Example: This is useful when
3289: making the navigation map, as we need to check whether we are under a
3290: page map to see if we need to link directly to the resource, or to the
3291: page. The first elements in the array will correspond to the top of
3292: the stack (most inclusive map).
3293:
3294: =cut
3295:
3296: sub getStack {
3297: my $self=shift;
3298:
3299: my @stack;
3300:
3301: $self->populateStack(\@stack);
3302:
3303: return \@stack;
3304: }
3305:
3306: # Private method: Calls the iterators recursively to populate the stack.
3307: sub populateStack {
3308: my $self=shift;
3309: my $stack = shift;
3310:
3311: push @$stack, $self->{HERE} if ($self->{HERE});
3312:
3313: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3314: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3315: }
3316: }
3317:
3318: 1;
3319:
3320: package Apache::lonnavmaps::DFSiterator;
3321: use Scalar::Util qw(weaken);
3322: use Apache::lonnet;
3323:
3324: # Not documented in the perldoc: This is a simple iterator that just walks
3325: # through the nav map and presents the resources in a depth-first search
3326: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3327: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3328: # useful for pre-processing of some kind, and is in fact used by the main
3329: # iterator that way, but that's about it.
3330: # One could imagine merging this into the init routine of the main iterator,
3331: # but this might as well be left separate, since it is possible some other
3332: # use might be found for it. - Jeremy
3333:
3334: # Unlike the main iterator, this DOES return all resources, even blank ones.
3335: # The main iterator needs them to correctly preprocess the map.
3336:
3337: sub BEGIN_MAP { return 1; } # begining of a new map
3338: sub END_MAP { return 2; } # end of the map
3339: sub FORWARD { return 1; } # go forward
3340: sub BACKWARD { return 2; }
3341:
3342: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3343: # filter hash ref (or undef), already seen hash or undef, condition
3344: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3345: sub new {
3346: # magic invocation to create a class instance
3347: my $proto = shift;
3348: my $class = ref($proto) || $proto;
3349: my $self = {};
3350:
3351: weaken($self->{NAV_MAP} = shift);
3352: return undef unless ($self->{NAV_MAP});
3353:
3354: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3355: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3356:
3357: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3358: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3359:
3360: # If the given resources are just the ID of the resource, get the
3361: # objects
3362: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3363: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3364: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3365: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3366:
3367: $self->{FILTER} = shift;
3368:
3369: # A hash, used as a set, of resource already seen
3370: $self->{ALREADY_SEEN} = shift;
3371: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3372: $self->{CONDITION} = shift;
3373: $self->{DIRECTION} = shift || FORWARD();
3374:
3375: # Flag: Have we started yet?
3376: $self->{STARTED} = 0;
3377:
3378: # Should we continue calling the recursive iterator, if any?
3379: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3380: # The recursive iterator, if any
3381: $self->{RECURSIVE_ITERATOR} = undef;
3382: # Are we recursing on a map, or a branch?
3383: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3384: # And the count of how deep it is, so that this iterator can keep track of
3385: # when to pick back up again.
3386: $self->{RECURSIVE_DEPTH} = 0;
3387:
3388: # For keeping track of our branches, we maintain our own stack
3389: $self->{STACK} = [];
3390:
3391: # Start with the first resource
3392: if ($self->{DIRECTION} == FORWARD) {
3393: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3394: } else {
3395: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3396: }
3397:
3398: bless($self);
3399: return $self;
3400: }
3401:
3402: sub next {
3403: my $self = shift;
3404:
3405: # Are we using a recursive iterator? If so, pull from that and
3406: # watch the depth; we want to resume our level at the correct time.
3407: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3408: # grab the next from the recursive iterator
3409: my $next = $self->{RECURSIVE_ITERATOR}->next();
3410:
3411: # is it a begin or end map? Update depth if so
3412: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3413: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3414:
3415: # Are we back at depth 0? If so, stop recursing.
3416: if ($self->{RECURSIVE_DEPTH} == 0) {
3417: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3418: }
3419:
3420: return $next;
3421: }
3422:
3423: # Is there a current resource to grab? If not, then return
3424: # END_MAP, which will end the iterator.
3425: if (scalar(@{$self->{STACK}}) == 0) {
3426: return $self->END_MAP();
3427: }
3428:
3429: # Have we not yet begun? If not, return BEGIN_MAP and
3430: # remember that we've started.
3431: if ( !$self->{STARTED} ) {
3432: $self->{STARTED} = 1;
3433: return $self->BEGIN_MAP;
3434: }
3435:
3436: # Get the next resource in the branch
3437: $self->{HERE} = pop @{$self->{STACK}};
3438:
3439: # remember that we've seen this, so we don't return it again later
3440: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3441:
3442: # Get the next possible resources
3443: my $nextUnfiltered;
3444: if ($self->{DIRECTION} == FORWARD()) {
3445: $nextUnfiltered = $self->{HERE}->getNext();
3446:
3447: } else {
3448: $nextUnfiltered = $self->{HERE}->getPrevious();
3449: }
3450: my $next = [];
3451:
3452: # filter the next possibilities to remove things we've
3453: # already seen.
3454: foreach my $item (@$nextUnfiltered) {
3455: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3456: push @$next, $item;
3457: }
3458: }
3459:
3460: while (@$next) {
3461: # copy the next possibilities over to the stack
3462: push @{$self->{STACK}}, shift @$next;
3463: }
3464:
3465: # If this is a map and we want to recurse down it... (not filtered out)
3466: if ($self->{HERE}->is_map() &&
3467: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3468: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3469: my $firstResource = $self->{HERE}->map_start();
3470: my $finishResource = $self->{HERE}->map_finish();
3471:
3472: $self->{RECURSIVE_ITERATOR} =
3473: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3474: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3475: $self->{CONDITION}, $self->{DIRECTION});
3476: }
3477:
3478: return $self->{HERE};
3479: }
3480:
3481: # Identical to the full iterator methods of the same name. Hate to copy/paste
3482: # but I also hate to "inherit" either iterator from the other.
3483:
3484: sub getStack {
3485: my $self=shift;
3486:
3487: my @stack;
3488:
3489: $self->populateStack(\@stack);
3490:
3491: return \@stack;
3492: }
3493:
3494: # Private method: Calls the iterators recursively to populate the stack.
3495: sub populateStack {
3496: my $self=shift;
3497: my $stack = shift;
3498:
3499: push @$stack, $self->{HERE} if ($self->{HERE});
3500:
3501: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3502: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3503: }
3504: }
3505:
3506: 1;
3507:
3508: package Apache::lonnavmaps::resource;
3509: use Scalar::Util qw(weaken);
3510: use Apache::lonnet;
3511:
3512: =pod
3513:
3514: =head1 Object: resource
3515:
3516: X<resource, navmap object>
3517: A resource object encapsulates a resource in a resource map, allowing
3518: easy manipulation of the resource, querying the properties of the
3519: resource (including user properties), and represents a reference that
3520: can be used as the canonical representation of the resource by
3521: lonnavmap clients like renderers.
3522:
3523: A resource only makes sense in the context of a navmap, as some of the
3524: data is stored in the navmap object.
3525:
3526: You will probably never need to instantiate this object directly. Use
3527: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3528: starting resource.
3529:
3530: Resource objects respect the parameter_hiddenparts, which suppresses
3531: various parts according to the wishes of the map author. As of this
3532: writing, there is no way to override this parameter, and suppressed
3533: parts will never be returned, nor will their response types or ids be
3534: stored.
3535:
3536: =head2 Overview
3537:
3538: A B<Resource> is the most granular type of object in LON-CAPA that can
3539: be included in a course. It can either be a particular resource, like
3540: an HTML page, external resource, problem, etc., or it can be a
3541: container sequence, such as a "page" or a "map".
3542:
3543: To see a sequence from the user's point of view, please see the
3544: B<Creating a Course: Maps and Sequences> chapter of the Author's
3545: Manual.
3546:
3547: A Resource Object, once obtained from a navmap object via a B<getBy*>
3548: method of the navmap, or from an iterator, allows you to query
3549: information about that resource.
3550:
3551: Generally, you do not ever want to create a resource object yourself,
3552: so creation has been left undocumented. Always retrieve resources
3553: from navmap objects.
3554:
3555: =head3 Identifying Resources
3556:
3557: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3558: unique to that resource for a given course. X<resource ID, in big hash>
3559: The Resource ID has the form #.#, where the first number is the same
3560: for every resource in a map, and the second is unique. For instance,
3561: for a course laid out like this:
3562:
3563: * Problem 1
3564: * Map
3565: * Resource 2
3566: * Resource 3
3567:
3568: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3569: C<Resource 3> will share a first number. The second number may end up
3570: re-used between the two groups.
3571:
3572: The resource ID is only used in the big hash, but can be used in the
3573: context of a course to identify a resource easily. (For instance, the
3574: printing system uses it to record which resources from a sequence you
3575: wish to print.)
3576:
3577: X<symb> X<resource, symb>
3578: All resources also have B<symb>s, which uniquely identify a resource
3579: in a course. Many internal LON-CAPA functions expect a symb. A symb
3580: carries along with it the URL of the resource, and the map it appears
3581: in. Symbs are much larger than resource IDs.
3582:
3583: =cut
3584:
3585: sub new {
3586: # magic invocation to create a class instance
3587: my $proto = shift;
3588: my $class = ref($proto) || $proto;
3589: my $self = {};
3590:
3591: weaken($self->{NAV_MAP} = shift);
3592: $self->{ID} = shift;
3593:
3594: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3595: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3596:
3597: # Store this new resource in the parent nav map's cache.
3598: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3599: $self->{RESOURCE_ERROR} = 0;
3600:
3601: # A hash that can be used by two-pass algorithms to store data
3602: # about this resource in. Not used by the resource object
3603: # directly.
3604: $self->{DATA} = {};
3605:
3606: bless($self);
3607:
3608: return $self;
3609: }
3610:
3611: # private function: simplify the NAV_HASH lookups we keep doing
3612: # pass the name, and to automatically append my ID, pass a true val on the
3613: # second param
3614: sub navHash {
3615: my $self = shift;
3616: my $param = shift;
3617: my $id = shift;
3618: my $arg = $param . ($id?$self->{ID}:"");
3619: if (ref($self) && ref($self->{NAV_MAP}) && defined($arg)) {
3620: return $self->{NAV_MAP}->navhash($arg);
3621: }
3622: return;
3623: }
3624:
3625: =pod
3626:
3627: =head2 Methods
3628:
3629: Once you have a resource object, here's what you can do with it:
3630:
3631: =head3 Attribute Retrieval
3632:
3633: Every resource has certain attributes that can be retrieved and used:
3634:
3635: =over 4
3636:
3637: =item * B<ID>: Every resource has an ID that is unique for that
3638: resource in the course it is in. The ID is actually in the hash
3639: representing the resource, so for a resource object $res, obtain
3640: it via C<$res->{ID}).
3641:
3642: =item * B<compTitle>:
3643:
3644: Returns a "composite title", that is equal to $res->title() if the
3645: resource has a title, and is otherwise the last part of the URL (e.g.,
3646: "problem.problem").
3647:
3648: =item * B<ext>:
3649:
3650: Returns true if the resource is external.
3651:
3652: =item * B<kind>:
3653:
3654: Returns the kind of the resource from the compiled nav map.
3655:
3656: =item * B<randomout>:
3657:
3658: Returns true if this resource was chosen to NOT be shown to the user
3659: by the random map selection feature. In other words, this is usually
3660: false.
3661:
3662: =item * B<randompick>:
3663:
3664: Returns the number of randomly picked items for a map if the randompick
3665: feature is being used on the map.
3666:
3667: =item * B<randomorder>:
3668:
3669: Returns true for a map if the randomorder feature is being used on the
3670: map.
3671:
3672: =item * B<src>:
3673:
3674: Returns the source for the resource.
3675:
3676: =item * B<symb>:
3677:
3678: Returns the symb for the resource.
3679:
3680: =item * B<title>:
3681:
3682: Returns the title of the resource.
3683:
3684: =back
3685:
3686: =cut
3687:
3688: # These info functions can be used directly, as they don't return
3689: # resource information.
3690: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3691: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3692: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3693: sub from { my $self=shift; return $self->navHash("from_", 1); }
3694: # considered private and undocumented
3695: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3696: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3697: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3698: sub randompick {
3699: my $self = shift;
3700: my $randompick = $self->parmval('randompick');
3701: return $randompick;
3702: }
3703: sub randomorder {
3704: my $self = shift;
3705: my $randomorder = $self->parmval('randomorder');
3706: return ($randomorder =~ /^yes$/i);
3707: }
3708: sub link {
3709: my $self=shift;
3710: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3711: return $self->src;
3712: }
3713: sub src {
3714: my $self=shift;
3715: return $self->navHash("src_", 1);
3716: }
3717: sub shown_symb {
3718: my $self=shift;
3719: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3720: return $self->symb();
3721: }
3722: sub id {
3723: my $self=shift;
3724: return $self->{ID};
3725: }
3726: sub enclosing_map_src {
3727: my $self=shift;
3728: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3729: return $self->navHash('map_id_'.$first);
3730: }
3731: sub symb {
3732: my $self=shift;
3733: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3734: my $symbSrc = &Apache::lonnet::declutter($self->src());
3735: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3736: . '___' . $second . '___' . $symbSrc;
3737: return &Apache::lonnet::symbclean($symb);
3738: }
3739: sub wrap_symb {
3740: my $self = shift;
3741: return $self->{NAV_MAP}->wrap_symb($self->symb());
3742: }
3743: sub title {
3744: my $self=shift;
3745: if ($self->{ID} eq '0.0') {
3746: # If this is the top-level map, return the title of the course
3747: # since this map can not be titled otherwise.
3748: return $env{'course.'.$env{'request.course.id'}.'.description'};
3749: }
3750: return $self->navHash("title_", 1); }
3751: # considered private and undocumented
3752: sub to { my $self=shift; return $self->navHash("to_", 1); }
3753: sub condition {
3754: my $self=shift;
3755: my $undercond=$self->navHash("undercond_", 1);
3756: if (!defined($undercond)) { return 1; };
3757: my $condid=$self->navHash("condid_$undercond");
3758: if (!defined($condid)) { return 1; };
3759: my $condition=&Apache::lonnet::directcondval($condid);
3760: return $condition;
3761: }
3762: sub condval {
3763: my $self=shift;
3764: my ($pathname,$filename) =
3765: &Apache::lonnet::split_uri_for_cond($self->src());
3766:
3767: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3768: /\&\Q$filename\E\:([\d\|]+)\&/);
3769: if ($match) {
3770: return &Apache::lonnet::condval($1);
3771: }
3772: return 0;
3773: }
3774: sub compTitle {
3775: my $self = shift;
3776: my $title = $self->title();
3777: $title=~s/\&colon\;/\:/gs;
3778: if (!$title) {
3779: $title = $self->src();
3780: $title = substr($title, rindex($title, '/') + 1);
3781: }
3782: return $title;
3783: }
3784:
3785: =pod
3786:
3787: B<Predicate Testing the Resource>
3788:
3789: These methods are shortcuts to deciding if a given resource has a given property.
3790:
3791: =over 4
3792:
3793: =item * B<is_map>:
3794:
3795: Returns true if the resource is a map type.
3796:
3797: =item * B<is_problem>:
3798:
3799: Returns true if the resource is a problem type, false
3800: otherwise. (Looks at the extension on the src field; might need more
3801: to work correctly.)
3802:
3803: =item * B<is_page>:
3804:
3805: Returns true if the resource is a page.
3806:
3807: =item * B<is_sequence>:
3808:
3809: Returns true if the resource is a sequence.
3810:
3811: =back
3812:
3813: =cut
3814:
3815: sub hasResource {
3816: my $self = shift;
3817: return $self->{NAV_MAP}->hasResource(@_);
3818: }
3819:
3820: sub retrieveResources {
3821: my $self = shift;
3822: return $self->{NAV_MAP}->retrieveResources(@_);
3823: }
3824:
3825: sub is_exam {
3826: my ($self,$part) = @_;
3827: my $type = $self->parmval('type',$part);
3828: if ($type eq 'exam') {
3829: return 1;
3830: }
3831: if ($self->src() =~ /\.(exam)$/) {
3832: return 1;
3833: }
3834: return 0;
3835: }
3836: sub is_html {
3837: my $self=shift;
3838: my $src = $self->src();
3839: return ($src =~ /html$/);
3840: }
3841: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3842: sub is_page {
3843: my $self=shift;
3844: my $src = $self->src();
3845: return $self->navHash("is_map_", 1) &&
3846: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3847: }
3848: sub is_practice {
3849: my $self=shift;
3850: my ($part) = @_;
3851: my $type = $self->parmval('type',$part);
3852: if ($type eq 'practice') {
3853: return 1;
3854: }
3855: return 0;
3856: }
3857: sub is_problem {
3858: my $self=shift;
3859: my $src = $self->src();
3860: if ($src =~ /$LONCAPA::assess_re/) {
3861: return !($self->is_practice());
3862: }
3863: return 0;
3864: }
3865: #
3866: # The has below is the set of status that are considered 'incomplete'
3867: #
3868: my %incomplete_hash =
3869: (
3870: TRIES_LEFT() => 1,
3871: OPEN() => 1,
3872: ATTEMPTED() => 1
3873:
3874: );
3875: #
3876: # Return tru if a problem is incomplete... for now incomplete means that
3877: # any part of the problem is incomplete.
3878: # Note that if the resources is not a problem, 0 is returned.
3879: #
3880: sub is_incomplete {
3881: my $self = shift;
3882: if ($self->is_problem()) {
3883: foreach my $part (@{$self->parts()}) {
3884: if (exists($incomplete_hash{$self->status($part)})) {
3885: return 1;
3886: }
3887: }
3888: }
3889: return 0;
3890:
3891: }
3892: sub is_raw_problem {
3893: my $self=shift;
3894: my $src = $self->src();
3895: if ($src =~ /$LONCAPA::assess_re/) {
3896: return 1;
3897: }
3898: return 0;
3899: }
3900:
3901: sub contains_problem {
3902: my $self=shift;
3903: if ($self->is_page()) {
3904: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3905: return $hasProblem;
3906: }
3907: return 0;
3908: }
3909: sub map_contains_problem {
3910: my $self=shift;
3911: if ($self->is_map()) {
3912: my $has_problem=
3913: $self->hasResource($self,sub { $_[0]->is_problem() },1);
3914: return $has_problem;
3915: }
3916: return 0;
3917: }
3918: sub is_sequence {
3919: my $self=shift;
3920: return $self->navHash("is_map_", 1) &&
3921: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3922: }
3923: sub is_survey {
3924: my $self = shift();
3925: my $part = shift();
3926: my $type = $self->parmval('type',$part);
3927: if (($type eq 'survey') || ($type eq 'surveycred')) {
3928: return 1;
3929: }
3930: if ($self->src() =~ /\.(survey)$/) {
3931: return 1;
3932: }
3933: return 0;
3934: }
3935: sub is_anonsurvey {
3936: my $self = shift();
3937: my $part = shift();
3938: my $type = $self->parmval('type',$part);
3939: if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
3940: return 1;
3941: }
3942: return 0;
3943: }
3944: sub is_task {
3945: my $self=shift;
3946: my $src = $self->src();
3947: return ($src =~ /\.(task)$/)
3948: }
3949:
3950: sub is_empty_sequence {
3951: my $self=shift;
3952: my $src = $self->src();
3953: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3954: }
3955:
3956: # Private method: Shells out to the parmval in the nav map, handler parts.
3957: sub parmval {
3958: my $self = shift;
3959: my $what = shift;
3960: my $part = shift;
3961: if (!defined($part)) {
3962: $part = '0';
3963: }
3964: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3965: }
3966:
3967: =pod
3968:
3969: B<Map Methods>
3970:
3971: These methods are useful for getting information about the map
3972: properties of the resource, if the resource is a map (B<is_map>).
3973:
3974: =over 4
3975:
3976: =item * B<map_finish>:
3977:
3978: Returns a reference to a resource object corresponding to the finish
3979: resource of the map.
3980:
3981: =item * B<map_pc>:
3982:
3983: Returns the pc value of the map, which is the first number that
3984: appears in the resource ID of the resources in the map, and is the
3985: number that appears around the middle of the symbs of the resources in
3986: that map.
3987:
3988: =item * B<map_start>:
3989:
3990: Returns a reference to a resource object corresponding to the start
3991: resource of the map.
3992:
3993: =item * B<map_type>:
3994:
3995: Returns a string with the type of the map in it.
3996:
3997: =item *B<map_hierarchy>:
3998:
3999: Returns a string with a comma-separated ordered list of map_pc IDs
4000: for the hierarchy of maps containing a map, with the top level
4001: map first, then descending to deeper levels, with the enclosing map last.
4002:
4003: =back
4004:
4005: =cut
4006:
4007: sub map_finish {
4008: my $self = shift;
4009: my $src = $self->src();
4010: $src = &Apache::lonnet::clutter($src);
4011: my $res = $self->navHash("map_finish_$src", 0);
4012: $res = $self->{NAV_MAP}->getById($res);
4013: return $res;
4014: }
4015: sub map_pc {
4016: my $self = shift;
4017: my $src = $self->src();
4018: return $self->navHash("map_pc_$src", 0);
4019: }
4020: sub map_start {
4021: my $self = shift;
4022: my $src = $self->src();
4023: $src = &Apache::lonnet::clutter($src);
4024: my $res = $self->navHash("map_start_$src", 0);
4025: $res = $self->{NAV_MAP}->getById($res);
4026: return $res;
4027: }
4028: sub map_type {
4029: my $self = shift;
4030: my $pc = $self->map_pc();
4031: return $self->navHash("map_type_$pc", 0);
4032: }
4033: sub map_hierarchy {
4034: my $self = shift;
4035: my $pc = $self->map_pc();
4036: return $self->navHash("map_hierarchy_$pc", 0);
4037: }
4038:
4039: #####
4040: # Property queries
4041: #####
4042:
4043: # These functions will be responsible for returning the CORRECT
4044: # VALUE for the parameter, no matter what. So while they may look
4045: # like direct calls to parmval, they can be more than that.
4046: # So, for instance, the duedate function should use the "duedatetype"
4047: # information, rather than the resource object user.
4048:
4049: =pod
4050:
4051: =head2 Resource Parameters
4052:
4053: In order to use the resource parameters correctly, the nav map must
4054: have been instantiated with genCourseAndUserOptions set to true, so
4055: the courseopt and useropt is read correctly. Then, you can call these
4056: functions to get the relevant parameters for the resource. Each
4057: function defaults to part "0", but can be directed to another part by
4058: passing the part as the parameter.
4059:
4060: These methods are responsible for getting the parameter correct, not
4061: merely reflecting the contents of the GDBM hashes. As we move towards
4062: dates relative to other dates, these methods should be updated to
4063: reflect that. (Then, anybody using these methods will not have to update
4064: their code.)
4065:
4066: =over 4
4067:
4068: =item * B<printable>
4069:
4070: returns true if the current date is such that the
4071: specified resource part is printable.
4072:
4073: =item * B<resprintable>
4074:
4075: Returns true if all parts in the resource are printable making the
4076: entire resource printable.
4077:
4078: =item * B<acc>
4079:
4080: Get the Client IP/Name Access Control information.
4081:
4082: =item * B<answerdate>:
4083:
4084: Get the answer-reveal date for the problem.
4085:
4086: =item * B<awarded>:
4087:
4088: Gets the awarded value for the problem part. Requires genUserData set to
4089: true when the navmap object was created.
4090:
4091: =item * B<duedate>:
4092:
4093: Get the due date for the problem.
4094:
4095: =item * B<tries>:
4096:
4097: Get the number of tries the student has used on the problem.
4098:
4099: =item * B<maxtries>:
4100:
4101: Get the number of max tries allowed.
4102:
4103: =item * B<opendate>:
4104:
4105: Get the open date for the problem.
4106:
4107: =item * B<sig>:
4108:
4109: Get the significant figures setting.
4110:
4111: =item * B<tol>:
4112:
4113: Get the tolerance for the problem.
4114:
4115: =item * B<tries>:
4116:
4117: Get the number of tries the user has already used on the problem.
4118:
4119: =item * B<type>:
4120:
4121: Get the question type for the problem.
4122:
4123: =item * B<weight>:
4124:
4125: Get the weight for the problem.
4126:
4127: =back
4128:
4129: =cut
4130:
4131: sub printable {
4132:
4133: my ($self, $part) = @_;
4134:
4135: # Get the print open/close dates for the resource.
4136:
4137: my $start = $self->parmval("prinstartdate", $part);
4138: my $end = $self->parmval("printenddate", $part);
4139:
4140: # The following cases apply:
4141: # - No dates set: Printable.
4142: # - Start date set but no end date: Printable if now >= start date.
4143: # - End date set but no start date: Printable if now <= end date.
4144: # - both defined: printable if start <= now <= end
4145: #
4146: my $now = time();
4147:
4148: my $startok = 1;
4149: my $endok = 1;
4150:
4151: if ((defined $start) && ($start ne '')) {
4152: $startok = $start <= $now;
4153: }
4154: if ((defined $end) && ($end != '')) {
4155: $endok = $end >= $now;
4156: }
4157: return $startok && $endok;
4158: }
4159:
4160: sub resprintable {
4161: my $self = shift;
4162:
4163: # get parts...or realize there are no parts.
4164:
4165: my $partsref = $self->parts();
4166: my @parts = @$partsref;
4167:
4168: if ((!defined(@parts)) || (scalar(@parts) == 0)) {
4169: return $self->printable(0);
4170: } else {
4171: foreach my $part (@parts) {
4172: if (!$self->printable($part)) {
4173: return 0;
4174: }
4175: }
4176: return 1;
4177: }
4178: }
4179:
4180: sub acc {
4181: (my $self, my $part) = @_;
4182: my $acc = $self->parmval("acc", $part);
4183: return $acc;
4184: }
4185: sub answerdate {
4186: (my $self, my $part) = @_;
4187: # Handle intervals
4188: my $answerdatetype = $self->parmval("answerdate.type", $part);
4189: my $answerdate = $self->parmval("answerdate", $part);
4190: my $duedate = $self->parmval("duedate", $part);
4191: if ($answerdatetype eq 'date_interval') {
4192: $answerdate = $duedate + $answerdate;
4193: }
4194: return $answerdate;
4195: }
4196: sub awarded {
4197: my $self = shift; my $part = shift;
4198: $self->{NAV_MAP}->get_user_data();
4199: if (!defined($part)) { $part = '0'; }
4200: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
4201: }
4202: sub taskversion {
4203: my $self = shift; my $part = shift;
4204: $self->{NAV_MAP}->get_user_data();
4205: if (!defined($part)) { $part = '0'; }
4206: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.version'};
4207: }
4208: sub taskstatus {
4209: my $self = shift; my $part = shift;
4210: $self->{NAV_MAP}->get_user_data();
4211: if (!defined($part)) { $part = '0'; }
4212: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
4213: }
4214: sub solved {
4215: my $self = shift; my $part = shift;
4216: $self->{NAV_MAP}->get_user_data();
4217: if (!defined($part)) { $part = '0'; }
4218: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.solved'};
4219: }
4220: sub checkedin {
4221: my $self = shift; my $part = shift;
4222: $self->{NAV_MAP}->get_user_data();
4223: if (!defined($part)) { $part = '0'; }
4224: if ($self->is_task()) {
4225: my $version = $self->taskversion($part);
4226: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
4227: } else {
4228: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin.slot'});
4229: }
4230: }
4231: # this should work exactly like the copy in lonhomework.pm
4232: # Why is there a copy in lonhomework? Why not centralized?
4233: #
4234: # TODO: Centralize duedate.
4235: #
4236:
4237: sub duedate {
4238: (my $self, my $part) = @_;
4239: my $date;
4240: my @interval=$self->parmval("interval", $part);
4241: my $due_date=$self->parmval("duedate", $part);
4242: if ($interval[0] =~ /\d+/) {
4243: my $first_access=&Apache::lonnet::get_first_access($interval[1],
4244: $self->symb);
4245: if (defined($first_access)) {
4246: my $interval = $first_access+$interval[0];
4247: $date = (!$due_date || $interval < $due_date) ? $interval
4248: : $due_date;
4249: } else {
4250: $date = $due_date;
4251: }
4252: } else {
4253: $date = $due_date;
4254: }
4255: return $date;
4256: }
4257: sub handgrade {
4258: (my $self, my $part) = @_;
4259: my @response_ids = $self->responseIds($part);
4260: if (@response_ids) {
4261: foreach my $response_id (@response_ids) {
4262: my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
4263: if (lc($handgrade) eq 'yes') {
4264: return 'yes';
4265: }
4266: }
4267: }
4268: my $handgrade = $self->parmval("handgrade", $part);
4269: return $handgrade;
4270: }
4271: sub maxtries {
4272: (my $self, my $part) = @_;
4273: my $maxtries = $self->parmval("maxtries", $part);
4274: return $maxtries;
4275: }
4276: sub opendate {
4277: (my $self, my $part) = @_;
4278: my $opendatetype = $self->parmval("opendate.type", $part);
4279: my $opendate = $self->parmval("opendate", $part);
4280: if ($opendatetype eq 'date_interval') {
4281: my $duedate = $self->duedate($part);
4282: $opendate = $duedate - $opendate;
4283: }
4284: return $opendate;
4285: }
4286: sub problemstatus {
4287: (my $self, my $part) = @_;
4288: my $problemstatus = $self->parmval("problemstatus", $part);
4289: return lc($problemstatus);
4290: }
4291: sub sig {
4292: (my $self, my $part) = @_;
4293: my $sig = $self->parmval("sig", $part);
4294: return $sig;
4295: }
4296: sub tol {
4297: (my $self, my $part) = @_;
4298: my $tol = $self->parmval("tol", $part);
4299: return $tol;
4300: }
4301: sub tries {
4302: my $self = shift;
4303: my $tries = $self->queryRestoreHash('tries', shift);
4304: if (!defined($tries)) { return '0';}
4305: return $tries;
4306: }
4307: sub type {
4308: (my $self, my $part) = @_;
4309: my $type = $self->parmval("type", $part);
4310: return $type;
4311: }
4312: sub weight {
4313: my $self = shift; my $part = shift;
4314: if (!defined($part)) { $part = '0'; }
4315: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
4316: $self->symb(), $self->{DOMAIN},
4317: $self->{USERNAME},
4318: $env{'request.course.sec'});
4319: return $weight;
4320: }
4321: sub part_display {
4322: my $self= shift(); my $partID = shift();
4323: if (! defined($partID)) { $partID = '0'; }
4324: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
4325: $self->symb);
4326: if (! defined($display) || $display eq '') {
4327: $display = $partID;
4328: }
4329: return $display;
4330: }
4331: sub slot_control {
4332: my $self=shift(); my $part = shift();
4333: if (!defined($part)) { $part = '0'; }
4334: my $useslots = $self->parmval("useslots", $part);
4335: my $availablestudent = $self->parmval("availablestudent", $part);
4336: my $available = $self->parmval("available", $part);
4337: return ($useslots,$availablestudent,$available);
4338: }
4339:
4340: # Multiple things need this
4341: sub getReturnHash {
4342: my $self = shift;
4343:
4344: if (!defined($self->{RETURN_HASH})) {
4345: my %tmpHash = &Apache::lonnet::restore($self->symb(),undef,$self->{DOMAIN},$self->{USERNAME});
4346: $self->{RETURN_HASH} = \%tmpHash;
4347: }
4348: }
4349:
4350: ######
4351: # Status queries
4352: ######
4353:
4354: # These methods query the status of problems.
4355:
4356: # If we need to count parts, this function determines the number of
4357: # parts from the metadata. When called, it returns a reference to a list
4358: # of strings corresponding to the parts. (Thus, using it in a scalar context
4359: # tells you how many parts you have in the problem:
4360: # $partcount = scalar($resource->countParts());
4361: # Don't use $self->{PARTS} directly because you don't know if it's been
4362: # computed yet.
4363:
4364: =pod
4365:
4366: =head2 Resource misc
4367:
4368: Misc. functions for the resource.
4369:
4370: =over 4
4371:
4372: =item * B<hasDiscussion>:
4373:
4374: Returns a false value if there has been discussion since the user last
4375: logged in, true if there has. Always returns false if the discussion
4376: data was not extracted when the nav map was constructed.
4377:
4378: =item * B<last_post_time>:
4379:
4380: Returns a false value if there hasn't been discussion otherwise returns
4381: unix timestamp of last time a discussion posting (or edit) was made.
4382:
4383: =item * B<discussion_info>:
4384:
4385: optional argument is a filter (currently can be 'unread');
4386: returns in scalar context the count of the number of discussion postings.
4387:
4388: returns in list context both the count of postings and a hash ref
4389: containing information about the postings (subject, id, timestamp) in a hash.
4390:
4391: 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.
4392:
4393: =item * B<getFeedback>:
4394:
4395: Gets the feedback for the resource and returns the raw feedback string
4396: for the resource, or the null string if there is no feedback or the
4397: email data was not extracted when the nav map was constructed. Usually
4398: used like this:
4399:
4400: for my $url (split(/\,/, $res->getFeedback())) {
4401: my $link = &escape($url);
4402: ...
4403:
4404: and use the link as appropriate.
4405:
4406: =cut
4407:
4408: sub hasDiscussion {
4409: my $self = shift;
4410: return $self->{NAV_MAP}->hasDiscussion($self->symb());
4411: }
4412:
4413: sub last_post_time {
4414: my $self = shift;
4415: return $self->{NAV_MAP}->last_post_time($self->symb());
4416: }
4417:
4418: sub discussion_info {
4419: my ($self,$filter) = @_;
4420: return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
4421: }
4422:
4423: sub getFeedback {
4424: my $self = shift;
4425: my $source = $self->src();
4426: my $symb = $self->symb();
4427: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4428: return $self->{NAV_MAP}->getFeedback($symb,$source);
4429: }
4430:
4431: sub getErrors {
4432: my $self = shift;
4433: my $source = $self->src();
4434: my $symb = $self->symb();
4435: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4436: return $self->{NAV_MAP}->getErrors($symb,$source);
4437: }
4438:
4439: =pod
4440:
4441: =item * B<parts>():
4442:
4443: Returns a list reference containing sorted strings corresponding to
4444: each part of the problem. Single part problems have only a part '0'.
4445: Multipart problems do not return their part '0', since they typically
4446: do not really matter.
4447:
4448: =item * B<countParts>():
4449:
4450: Returns the number of parts of the problem a student can answer. Thus,
4451: for single part problems, returns 1. For multipart, it returns the
4452: number of parts in the problem, not including psuedo-part 0.
4453:
4454: =item * B<countResponses>():
4455:
4456: Returns the total number of responses in the problem a student can answer.
4457:
4458: =item * B<responseTypes>():
4459:
4460: Returns a hash whose keys are the response types. The values are the number
4461: of times each response type is used. This is for the I<entire> problem, not
4462: just a single part.
4463:
4464: =item * B<multipart>():
4465:
4466: Returns true if the problem is multipart, false otherwise. Use this instead
4467: of countParts if all you want is multipart/not multipart.
4468:
4469: =item * B<responseType>($part):
4470:
4471: Returns the response type of the part, without the word "response" on the
4472: end. Example return values: 'string', 'essay', 'numeric', etc.
4473:
4474: =item * B<responseIds>($part):
4475:
4476: Retreives the response IDs for the given part as an array reference containing
4477: strings naming the response IDs. This may be empty.
4478:
4479: =back
4480:
4481: =cut
4482:
4483: sub parts {
4484: my $self = shift;
4485:
4486: if ($self->ext) { return []; }
4487:
4488: $self->extractParts();
4489: return $self->{PARTS};
4490: }
4491:
4492: sub countParts {
4493: my $self = shift;
4494:
4495: my $parts = $self->parts();
4496:
4497: # If I left this here, then it's not necessary.
4498: #my $delta = 0;
4499: #for my $part (@$parts) {
4500: # if ($part eq '0') { $delta--; }
4501: #}
4502:
4503: if ($self->{RESOURCE_ERROR}) {
4504: return 0;
4505: }
4506:
4507: return scalar(@{$parts}); # + $delta;
4508: }
4509:
4510: sub countResponses {
4511: my $self = shift;
4512: my $count;
4513: foreach my $part (@{$self->parts()}) {
4514: $count+= scalar($self->responseIds($part));
4515: }
4516: return $count;
4517: }
4518:
4519: sub responseTypes {
4520: my $self = shift;
4521: my %responses;
4522: foreach my $part (@{$self->parts()}) {
4523: foreach my $responsetype ($self->responseType($part)) {
4524: $responses{$responsetype}++ if (defined($responsetype));
4525: }
4526: }
4527: return %responses;
4528: }
4529:
4530: sub multipart {
4531: my $self = shift;
4532: return $self->countParts() > 1;
4533: }
4534:
4535: sub singlepart {
4536: my $self = shift;
4537: return $self->countParts() == 1;
4538: }
4539:
4540: sub responseType {
4541: my $self = shift;
4542: my $part = shift;
4543:
4544: $self->extractParts();
4545: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4546: return @{$self->{RESPONSE_TYPES}->{$part}};
4547: } else {
4548: return undef;
4549: }
4550: }
4551:
4552: sub responseIds {
4553: my $self = shift;
4554: my $part = shift;
4555:
4556: $self->extractParts();
4557: if (defined($self->{RESPONSE_IDS}->{$part})) {
4558: return @{$self->{RESPONSE_IDS}->{$part}};
4559: } else {
4560: return undef;
4561: }
4562: }
4563:
4564: # Private function: Extracts the parts information, both part names and
4565: # part types, and saves it.
4566: sub extractParts {
4567: my $self = shift;
4568:
4569: return if (defined($self->{PARTS}));
4570: return if ($self->ext);
4571:
4572: $self->{PARTS} = [];
4573:
4574: my %parts;
4575:
4576: # Retrieve part count, if this is a problem
4577: if ($self->is_problem()) {
4578: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4579: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4580:
4581: if ($partorder) {
4582: my @parts;
4583: for my $part (split (/,/,$partorder)) {
4584: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4585: push @parts, $part;
4586: $parts{$part} = 1;
4587: }
4588: }
4589: $self->{PARTS} = \@parts;
4590: } else {
4591: if (!$metadata) {
4592: $self->{RESOURCE_ERROR} = 1;
4593: $self->{PARTS} = [];
4594: $self->{PART_TYPE} = {};
4595: return;
4596: }
4597: foreach my $entry (split(/\,/,$metadata)) {
4598: if ($entry =~ /^(?:part|Task)_(.*)$/) {
4599: my $part = $1;
4600: # This floods the logs if it blows up
4601: if (defined($parts{$part})) {
4602: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4603: }
4604:
4605: # check to see if part is turned off.
4606:
4607: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4608: $parts{$part} = 1;
4609: }
4610: }
4611: }
4612: my @sortedParts = sort keys %parts;
4613: $self->{PARTS} = \@sortedParts;
4614: }
4615:
4616:
4617: # These hashes probably do not need names that end with "Hash"....
4618: my %responseIdHash;
4619: my %responseTypeHash;
4620:
4621:
4622: # Init the responseIdHash
4623: foreach my $part (@{$self->{PARTS}}) {
4624: $responseIdHash{$part} = [];
4625: }
4626:
4627: # Now, the unfortunate thing about this is that parts, part name, and
4628: # response id are delimited by underscores, but both the part
4629: # name and response id can themselves have underscores in them.
4630: # So we have to use our knowlege of part names to figure out
4631: # where the part names begin and end, and even then, it is possible
4632: # to construct ambiguous situations.
4633: foreach my $data (split /,/, $metadata) {
4634: if ($data =~ /^([a-zA-Z]+)response_(.*)/
4635: || $data =~ /^(Task)_(.*)/) {
4636: my $responseType = $1;
4637: my $partStuff = $2;
4638: my $partIdSoFar = '';
4639: my @partChunks = split /_/, $partStuff;
4640: my $i = 0;
4641: for ($i = 0; $i < scalar(@partChunks); $i++) {
4642: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4643: $partIdSoFar .= $partChunks[$i];
4644: if ($parts{$partIdSoFar}) {
4645: my @otherChunks = @partChunks[$i+1..$#partChunks];
4646: my $responseId = join('_', @otherChunks);
4647: if ($self->is_task()) {
4648: push(@{$responseIdHash{$partIdSoFar}},
4649: $partIdSoFar);
4650: } else {
4651: push(@{$responseIdHash{$partIdSoFar}},
4652: $responseId);
4653: }
4654: push(@{$responseTypeHash{$partIdSoFar}},
4655: $responseType);
4656: }
4657: }
4658: }
4659: }
4660: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4661: #
4662: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4663: if ($resorder) {
4664: my @resorder=split(/,/,$resorder);
4665: foreach my $part (keys(%responseIdHash)) {
4666: my $i=0;
4667: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4668: my @neworder;
4669: foreach my $possibleid (@resorder) {
4670: if (exists($resids{$possibleid})) {
4671: push(@neworder,$resids{$possibleid});
4672: }
4673: }
4674: my @ids;
4675: my @type;
4676: foreach my $element (@neworder) {
4677: push (@ids,$responseIdHash{$part}->[$element]);
4678: push (@type,$responseTypeHash{$part}->[$element]);
4679: }
4680: $responseIdHash{$part}=\@ids;
4681: $responseTypeHash{$part}=\@type;
4682: }
4683: }
4684: $self->{RESPONSE_IDS} = \%responseIdHash;
4685: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4686: }
4687:
4688: return;
4689: }
4690:
4691: =pod
4692:
4693: =head2 Resource Status
4694:
4695: Problem resources have status information, reflecting their various
4696: dates and completion statuses.
4697:
4698: There are two aspects to the status: the date-related information and
4699: the completion information.
4700:
4701: Idiomatic usage of these two methods would probably look something
4702: like
4703:
4704: foreach my $part ($resource->parts()) {
4705: my $dateStatus = $resource->getDateStatus($part);
4706: my $completionStatus = $resource->getCompletionStatus($part);
4707:
4708: or
4709:
4710: my $status = $resource->status($part);
4711:
4712: ... use it here ...
4713: }
4714:
4715: Which you use depends on exactly what you are looking for. The
4716: status() function has been optimized for the nav maps display and may
4717: not precisely match what you need elsewhere.
4718:
4719: The symbolic constants shown below can be accessed through the
4720: resource object: C<$res->OPEN>.
4721:
4722: =over 4
4723:
4724: =item * B<getDateStatus>($part):
4725:
4726: ($part defaults to 0). A convenience function that returns a symbolic
4727: constant telling you about the date status of the part. The possible
4728: return values are:
4729:
4730: =back
4731:
4732: B<Date Codes>
4733:
4734: =over 4
4735:
4736: =item * B<OPEN_LATER>:
4737:
4738: The problem will be opened later.
4739:
4740: =item * B<OPEN>:
4741:
4742: Open and not yet due.
4743:
4744:
4745: =item * B<PAST_DUE_ANSWER_LATER>:
4746:
4747: The due date has passed, but the answer date has not yet arrived.
4748:
4749: =item * B<PAST_DUE_NO_ANSWER>:
4750:
4751: The due date has passed and there is no answer opening date set.
4752:
4753: =item * B<ANSWER_OPEN>:
4754:
4755: The answer date is here.
4756:
4757: =item * B<NETWORK_FAILURE>:
4758:
4759: The information is unknown due to network failure.
4760:
4761: =back
4762:
4763: =cut
4764:
4765: # Apparently the compiler optimizes these into constants automatically
4766: sub OPEN_LATER { return 0; }
4767: sub OPEN { return 1; }
4768: sub PAST_DUE_NO_ANSWER { return 2; }
4769: sub PAST_DUE_ANSWER_LATER { return 3; }
4770: sub ANSWER_OPEN { return 4; }
4771: sub NOTHING_SET { return 5; }
4772: sub NETWORK_FAILURE { return 100; }
4773:
4774: # getDateStatus gets the date status for a given problem part.
4775: # Because answer date, due date, and open date are fully independent
4776: # (i.e., it is perfectly possible to *only* have an answer date),
4777: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4778: # (past, future, none given). This function handles this with a decision
4779: # tree. Read the comments to follow the decision tree.
4780:
4781: sub getDateStatus {
4782: my $self = shift;
4783: my $part = shift;
4784: $part = "0" if (!defined($part));
4785:
4786: # Always return network failure if there was one.
4787: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4788:
4789: my $now = time();
4790:
4791: my $open = $self->opendate($part);
4792: my $due = $self->duedate($part);
4793: my $answer = $self->answerdate($part);
4794:
4795: if (!$open && !$due && !$answer) {
4796: # no data on the problem at all
4797: # should this be the same as "open later"? think multipart.
4798: return $self->NOTHING_SET;
4799: }
4800: if (!$open || $now < $open) {return $self->OPEN_LATER}
4801: if (!$due || $now < $due) {return $self->OPEN}
4802: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4803: if ($answer) { return $self->ANSWER_OPEN; }
4804: return PAST_DUE_NO_ANSWER;
4805: }
4806:
4807: =pod
4808:
4809: B<>
4810:
4811: =over 4
4812:
4813: =item * B<getCompletionStatus>($part):
4814:
4815: ($part defaults to 0.) A convenience function that returns a symbolic
4816: constant telling you about the completion status of the part, with the
4817: following possible results:
4818:
4819: =back
4820:
4821: B<Completion Codes>
4822:
4823: =over 4
4824:
4825: =item * B<NOT_ATTEMPTED>:
4826:
4827: Has not been attempted at all.
4828:
4829: =item * B<INCORRECT>:
4830:
4831: Attempted, but wrong by student.
4832:
4833: =item * B<INCORRECT_BY_OVERRIDE>:
4834:
4835: Attempted, but wrong by instructor override.
4836:
4837: =item * B<CORRECT>:
4838:
4839: Correct or correct by instructor.
4840:
4841: =item * B<CORRECT_BY_OVERRIDE>:
4842:
4843: Correct by instructor override.
4844:
4845: =item * B<EXCUSED>:
4846:
4847: Excused. Not yet implemented.
4848:
4849: =item * B<NETWORK_FAILURE>:
4850:
4851: Information not available due to network failure.
4852:
4853: =item * B<ATTEMPTED>:
4854:
4855: Attempted, and not yet graded.
4856:
4857: =item * B<CREDIT_ATTEMPTED>:
4858:
4859: Attempted, and credit received for attempt (survey and anonymous survey only).
4860:
4861: =back
4862:
4863: =cut
4864:
4865: sub NOT_ATTEMPTED { return 10; }
4866: sub INCORRECT { return 11; }
4867: sub INCORRECT_BY_OVERRIDE { return 12; }
4868: sub CORRECT { return 13; }
4869: sub CORRECT_BY_OVERRIDE { return 14; }
4870: sub EXCUSED { return 15; }
4871: sub ATTEMPTED { return 16; }
4872: sub CREDIT_ATTEMPTED { return 17; }
4873:
4874: sub getCompletionStatus {
4875: my $self = shift;
4876: my $part = shift;
4877: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4878:
4879: my $status = $self->queryRestoreHash('solved', $part);
4880:
4881: # Left as separate if statements in case we ever do more with this
4882: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4883: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4884: if ($status eq 'correct_by_override') {
4885: return $self->CORRECT_BY_OVERRIDE;
4886: }
4887: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4888: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4889: if ($status eq 'excused') {return $self->EXCUSED; }
4890: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4891: if ($status eq 'credit_attempted') {
4892: if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
4893: return $self->CREDIT_ATTEMPTED;
4894: } else {
4895: return $self->ATTEMPTED;
4896: }
4897: }
4898: return $self->NOT_ATTEMPTED;
4899: }
4900:
4901: sub queryRestoreHash {
4902: my $self = shift;
4903: my $hashentry = shift;
4904: my $part = shift;
4905: $part = "0" if (!defined($part) || $part eq '');
4906: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4907:
4908: $self->getReturnHash();
4909:
4910: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4911: }
4912:
4913: =pod
4914:
4915: B<Composite Status>
4916:
4917: Along with directly returning the date or completion status, the
4918: resource object includes a convenience function B<status>() that will
4919: combine the two status tidbits into one composite status that can
4920: represent the status of the resource as a whole. This method represents
4921: the concept of the thing we want to display to the user on the nav maps
4922: screen, which is a combination of completion and open status. The precise logic is
4923: documented in the comments of the status method. The following results
4924: may be returned, all available as methods on the resource object
4925: ($res->NETWORK_FAILURE): In addition to the return values that match
4926: the date or completion status, this function can return "ANSWER_SUBMITTED"
4927: if that problemstatus parameter value is set to No, suppressing the
4928: incorrect/correct feedback.
4929:
4930: =over 4
4931:
4932: =item * B<NETWORK_FAILURE>:
4933:
4934: The network has failed and the information is not available.
4935:
4936: =item * B<NOTHING_SET>:
4937:
4938: No dates have been set for this problem (part) at all. (Because only
4939: certain parts of a multi-part problem may be assigned, this can not be
4940: collapsed into "open later", as we do not know a given part will EVER
4941: be opened. For single part, this is the same as "OPEN_LATER".)
4942:
4943: =item * B<CORRECT>:
4944:
4945: For any reason at all, the part is considered correct.
4946:
4947: =item * B<EXCUSED>:
4948:
4949: For any reason at all, the problem is excused.
4950:
4951: =item * B<PAST_DUE_NO_ANSWER>:
4952:
4953: The problem is past due, not considered correct, and no answer date is
4954: set.
4955:
4956: =item * B<PAST_DUE_ANSWER_LATER>:
4957:
4958: The problem is past due, not considered correct, and an answer date in
4959: the future is set.
4960:
4961: =item * B<ANSWER_OPEN>:
4962:
4963: The problem is past due, not correct, and the answer is now available.
4964:
4965: =item * B<OPEN_LATER>:
4966:
4967: The problem is not yet open.
4968:
4969: =item * B<TRIES_LEFT>:
4970:
4971: The problem is open, has been tried, is not correct, but there are
4972: tries left.
4973:
4974: =item * B<INCORRECT>:
4975:
4976: The problem is open, and all tries have been used without getting the
4977: correct answer.
4978:
4979: =item * B<OPEN>:
4980:
4981: The item is open and not yet tried.
4982:
4983: =item * B<ATTEMPTED>:
4984:
4985: The problem has been attempted.
4986:
4987: =item * B<CREDIT_ATTEMPTED>:
4988:
4989: The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
4990:
4991: =item * B<ANSWER_SUBMITTED>:
4992:
4993: An answer has been submitted, but the student should not see it.
4994:
4995: =back
4996:
4997: =cut
4998:
4999: sub TRIES_LEFT { return 20; }
5000: sub ANSWER_SUBMITTED { return 21; }
5001: sub PARTIALLY_CORRECT { return 22; }
5002:
5003: sub RESERVED_LATER { return 30; }
5004: sub RESERVED { return 31; }
5005: sub RESERVED_LOCATION { return 32; }
5006: sub RESERVABLE { return 33; }
5007: sub RESERVABLE_LATER { return 34; }
5008: sub NOTRESERVABLE { return 35; }
5009: sub NOT_IN_A_SLOT { return 36; }
5010: sub NEEDS_CHECKIN { return 37; }
5011: sub WAITING_FOR_GRADE { return 38; }
5012: sub UNKNOWN { return 39; }
5013:
5014: sub status {
5015: my $self = shift;
5016: my $part = shift;
5017: if (!defined($part)) { $part = "0"; }
5018: my $completionStatus = $self->getCompletionStatus($part);
5019: my $dateStatus = $self->getDateStatus($part);
5020:
5021: # What we have is a two-dimensional matrix with 4 entries on one
5022: # dimension and 5 entries on the other, which we want to colorize,
5023: # plus network failure and "no date data at all".
5024:
5025: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
5026: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
5027:
5028: my $suppressFeedback = 0;
5029: if (($self->problemstatus($part) eq 'no') ||
5030: ($self->problemstatus($part) eq 'no_feedback_ever')) {
5031: $suppressFeedback = 1;
5032: }
5033: # If there's an answer date and we're past it, don't
5034: # suppress the feedback; student should know
5035: if ($self->duedate($part) && $self->duedate($part) < time() &&
5036: $self->answerdate($part) && $self->answerdate($part) < time()) {
5037: $suppressFeedback = 0;
5038: }
5039:
5040: # There are a few whole rows we can dispose of:
5041: if ($completionStatus == CORRECT ||
5042: $completionStatus == CORRECT_BY_OVERRIDE ) {
5043: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
5044: my $awarded=$self->awarded($part);
5045: if ($awarded < 1 && $awarded > 0) {
5046: return PARTIALLY_CORRECT;
5047: } elsif ($awarded<1) {
5048: return INCORRECT;
5049: }
5050: return CORRECT;
5051: }
5052:
5053: # If it's WRONG... and not open
5054: if ( ($completionStatus == INCORRECT ||
5055: $completionStatus == INCORRECT_BY_OVERRIDE)
5056: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
5057: return INCORRECT;
5058: }
5059:
5060: if ($completionStatus == ATTEMPTED) {
5061: return ATTEMPTED;
5062: }
5063:
5064: if ($completionStatus == CREDIT_ATTEMPTED) {
5065: return CREDIT_ATTEMPTED;
5066: }
5067:
5068: # If it's EXCUSED, then return that no matter what
5069: if ($completionStatus == EXCUSED) {
5070: return EXCUSED;
5071: }
5072:
5073: if ($dateStatus == NOTHING_SET) {
5074: return NOTHING_SET;
5075: }
5076:
5077: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
5078: # by 4 matrix (date statuses).
5079:
5080: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
5081: $dateStatus == PAST_DUE_NO_ANSWER ) {
5082: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
5083: }
5084:
5085: if ($dateStatus == ANSWER_OPEN) {
5086: return ANSWER_OPEN;
5087: }
5088:
5089: # Now: (incorrect, incorrect_override, not_attempted) x
5090: # (open_later), (open)
5091:
5092: if ($dateStatus == OPEN_LATER) {
5093: return OPEN_LATER;
5094: }
5095:
5096: # If it's WRONG...
5097: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
5098: # and there are TRIES LEFT:
5099: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5100: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
5101: }
5102: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
5103: }
5104:
5105: # Otherwise, it's untried and open
5106: return OPEN;
5107: }
5108:
5109: sub check_for_slot {
5110: my $self = shift;
5111: my $part = shift;
5112: my $symb = $self->symb();
5113: my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
5114: if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
5115: my @slots = (split(/:/,$availablestudent),split(/:/,$available));
5116: my $cid=$env{'request.course.id'};
5117: my $cdom=$env{'course.'.$cid.'.domain'};
5118: my $cnum=$env{'course.'.$cid.'.num'};
5119: my $now = time;
5120: my $num_usable_slots = 0;
5121: if (@slots > 0) {
5122: my %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
5123: if (&Apache::lonnet::error(%slots)) {
5124: return (UNKNOWN);
5125: }
5126: my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots,'starttime');
5127: my ($checkedin,$checkedinslot);
5128: foreach my $slot_name (@sorted_slots) {
5129: next if (!defined($slots{$slot_name}) || !ref($slots{$slot_name}));
5130: my $end = $slots{$slot_name}->{'endtime'};
5131: my $start = $slots{$slot_name}->{'starttime'};
5132: my $ip = $slots{$slot_name}->{'ip'};
5133: if ($self->simpleStatus() == OPEN) {
5134: if ($end > $now) {
5135: if ($start > $now) {
5136: return (RESERVED_LATER,$start,$slot_name);
5137: } else {
5138: if ($ip ne '') {
5139: if (!&Apache::loncommon::check_ip_acc($ip)) {
5140: return (RESERVED_LOCATION,$ip,$slot_name);
5141: }
5142: }
5143: my @proctors;
5144: if ($slots{$slot_name}->{'proctor'} ne '') {
5145: @proctors = split(',',$slots{$slot_name}->{'proctor'});
5146: }
5147: if (@proctors > 0) {
5148: ($checkedin,$checkedinslot) = $self->checkedin();
5149: unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
5150: ($checkedinslot eq $slot_name)) {
5151: return (NEEDS_CHECKIN,undef,$slot_name);
5152: }
5153: }
5154: return (RESERVED,$end,$slot_name);
5155: }
5156: }
5157: } elsif ($end > $now) {
5158: $num_usable_slots ++;
5159: }
5160: }
5161: my ($is_correct,$got_grade);
5162: if ($self->is_task()) {
5163: my $taskstatus = $self->taskstatus();
5164: $is_correct = (($taskstatus eq 'pass') ||
5165: ($self->solved() =~ /^correct_/));
5166: $got_grade = ($taskstatus =~ /^(?:pass|fail)$/);
5167: } else {
5168: $got_grade = 1;
5169: $is_correct = ($self->solved() =~ /^correct_/);
5170: }
5171: ($checkedin,$checkedinslot) = $self->checkedin();
5172: if ($checkedin) {
5173: if (!$got_grade) {
5174: return (WAITING_FOR_GRADE);
5175: } elsif ($is_correct) {
5176: return (CORRECT);
5177: }
5178: }
5179: if ($num_usable_slots) {
5180: return(NOT_IN_A_SLOT);
5181: }
5182: }
5183: my $reservable = &Apache::lonnet::get_reservable_slots($cnum,$cdom,$env{'user.name'},
5184: $env{'user.domain'});
5185: if (ref($reservable) eq 'HASH') {
5186: if ((ref($reservable->{'now_order'}) eq 'ARRAY') && (ref($reservable->{'now'}) eq 'HASH')) {
5187: foreach my $slot (reverse (@{$reservable->{'now_order'}})) {
5188: if (($reservable->{'now'}{$slot}{'symb'} eq '') ||
5189: ($reservable->{'now'}{$slot}{'symb'} eq $symb)) {
5190: return(RESERVABLE,$reservable->{'now'}{$slot}{'endreserve'});
5191: }
5192: }
5193: }
5194: if ((ref($reservable->{'future_order'}) eq 'ARRAY') && (ref($reservable->{'future'}) eq 'HASH')) {
5195: foreach my $slot (@{$reservable->{'future_order'}}) {
5196: if (($reservable->{'future'}{$slot}{'symb'} eq '') ||
5197: ($reservable->{'future'}{$slot}{'symb'} eq $symb)) {
5198: return(RESERVABLE_LATER,$reservable->{'future'}{$slot}{'startreserve'});
5199: }
5200: }
5201: }
5202: }
5203: return(NOTRESERVABLE);
5204: }
5205: return;
5206: }
5207:
5208: sub CLOSED { return 23; }
5209: sub ERROR { return 24; }
5210:
5211: =pod
5212:
5213: B<Simple Status>
5214:
5215: Convenience method B<simpleStatus> provides a "simple status" for the resource.
5216: "Simple status" corresponds to "which icon is shown on the
5217: Navmaps". There are six "simple" statuses:
5218:
5219: =over 4
5220:
5221: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
5222:
5223: =item * B<OPEN>: The problem is open and unattempted.
5224:
5225: =item * B<CORRECT>: The problem is correct for any reason.
5226:
5227: =item * B<INCORRECT>: The problem is incorrect and can still be
5228: completed successfully.
5229:
5230: =item * B<ATTEMPTED>: The problem has been attempted, but the student
5231: does not know if they are correct. (The ellipsis icon.)
5232:
5233: =item * B<ERROR>: There is an error retrieving information about this
5234: problem.
5235:
5236: =back
5237:
5238: =cut
5239:
5240: # This hash maps the composite status to this simple status, and
5241: # can be used directly, if you like
5242: my %compositeToSimple =
5243: (
5244: NETWORK_FAILURE() => ERROR,
5245: NOTHING_SET() => CLOSED,
5246: CORRECT() => CORRECT,
5247: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
5248: EXCUSED() => CORRECT,
5249: PAST_DUE_NO_ANSWER() => INCORRECT,
5250: PAST_DUE_ANSWER_LATER() => INCORRECT,
5251: ANSWER_OPEN() => INCORRECT,
5252: OPEN_LATER() => CLOSED,
5253: TRIES_LEFT() => OPEN,
5254: INCORRECT() => INCORRECT,
5255: OPEN() => OPEN,
5256: ATTEMPTED() => ATTEMPTED,
5257: CREDIT_ATTEMPTED() => CORRECT,
5258: ANSWER_SUBMITTED() => ATTEMPTED
5259: );
5260:
5261: sub simpleStatus {
5262: my $self = shift;
5263: my $part = shift;
5264: my $status = $self->status($part);
5265: return $compositeToSimple{$status};
5266: }
5267:
5268: =pod
5269:
5270: B<simpleStatusCount> will return an array reference containing, in
5271: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
5272: and ERROR parts the given problem has.
5273:
5274: =cut
5275:
5276: # This maps the status to the slot we want to increment
5277: my %statusToSlotMap =
5278: (
5279: OPEN() => 0,
5280: CLOSED() => 1,
5281: CORRECT() => 2,
5282: INCORRECT() => 3,
5283: ATTEMPTED() => 4,
5284: ERROR() => 5
5285: );
5286:
5287: sub statusToSlot { return $statusToSlotMap{shift()}; }
5288:
5289: sub simpleStatusCount {
5290: my $self = shift;
5291:
5292: my @counts = (0, 0, 0, 0, 0, 0, 0);
5293: foreach my $part (@{$self->parts()}) {
5294: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
5295: }
5296:
5297: return \@counts;
5298: }
5299:
5300: =pod
5301:
5302: B<Completable>
5303:
5304: The completable method represents the concept of I<whether the student can
5305: currently do the problem>. If the student can do the problem, which means
5306: that it is open, there are tries left, and if the problem is manually graded
5307: or the grade is suppressed via problemstatus, the student has not tried it
5308: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
5309: either the student has tried it and there is no feedback, or that for
5310: some reason it is no longer completable (not open yet, successfully completed,
5311: out of tries, etc.). As an example, this is used as the filter for the
5312: "Uncompleted Homework" option for the nav maps.
5313:
5314: If this does not quite meet your needs, do not fiddle with it (unless you are
5315: fixing it to better match the student's conception of "completable" because
5316: it's broken somehow)... make a new method.
5317:
5318: =cut
5319:
5320: sub completable {
5321: my $self = shift;
5322: if (!$self->is_problem()) { return 0; }
5323: my $partCount = $self->countParts();
5324:
5325: foreach my $part (@{$self->parts()}) {
5326: if ($part eq '0' && $partCount != 1) { next; }
5327: my $status = $self->status($part);
5328: # "If any of the parts are open, or have tries left (implies open),
5329: # and it is not "attempted" (manually graded problem), it is
5330: # not "complete"
5331: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5332: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5333: $status == ANSWER_SUBMITTED() ) {
5334: # did this part already, as well as we can
5335: next;
5336: }
5337: if ($status == OPEN() || $status == TRIES_LEFT()) {
5338: return 1;
5339: }
5340: }
5341:
5342: # If all the parts were complete, so was this problem.
5343: return 0;
5344: }
5345:
5346: =pod
5347:
5348: =head2 Resource/Nav Map Navigation
5349:
5350: =over 4
5351:
5352: =item * B<getNext>():
5353:
5354: Retreive an array of the possible next resources after this
5355: one. Always returns an array, even in the one- or zero-element case.
5356:
5357: =item * B<getPrevious>():
5358:
5359: Retreive an array of the possible previous resources from this
5360: one. Always returns an array, even in the one- or zero-element case.
5361:
5362: =cut
5363:
5364: sub getNext {
5365: my $self = shift;
5366: my @branches;
5367: my $to = $self->to();
5368: foreach my $branch ( split(/,/, $to) ) {
5369: my $choice = $self->{NAV_MAP}->getById($branch);
5370: #if (!$choice->condition()) { next; }
5371: my $next = $choice->goesto();
5372: $next = $self->{NAV_MAP}->getById($next);
5373:
5374: push @branches, $next;
5375: }
5376: return \@branches;
5377: }
5378:
5379: sub getPrevious {
5380: my $self = shift;
5381: my @branches;
5382: my $from = $self->from();
5383: foreach my $branch ( split /,/, $from) {
5384: my $choice = $self->{NAV_MAP}->getById($branch);
5385: my $prev = $choice->comesfrom();
5386: $prev = $self->{NAV_MAP}->getById($prev);
5387:
5388: push @branches, $prev;
5389: }
5390: return \@branches;
5391: }
5392:
5393: sub browsePriv {
5394: my $self = shift;
5395: if (defined($self->{BROWSE_PRIV})) {
5396: return $self->{BROWSE_PRIV};
5397: }
5398:
5399: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
5400: $self->symb());
5401: }
5402:
5403: =pod
5404:
5405: =back
5406:
5407: =cut
5408:
5409: 1;
5410:
5411: __END__
5412:
5413:
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