1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.475 2011/12/21 20:21:49 raeburn Exp $
5:
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: ###
30:
31: =pod
32:
33: =head1 NAME
34:
35: Apache::lonnavmaps - Subroutines to handle and render the navigation
36:
37: =head1 SYNOPSIS
38:
39: Handles navigational maps.
40:
41: The main handler generates the navigational listing for the course,
42: the other objects export this information in a usable fashion for
43: other modules.
44:
45:
46: This is part of the LearningOnline Network with CAPA project
47: described at http://www.lon-capa.org.
48:
49:
50: =head1 OVERVIEW
51:
52: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
53: course structure and caches it in what is often referred to as the
54: "big hash" X<big hash>. You can see it if you are logged into
55: LON-CAPA, in a course, by going to /adm/test. (You may need to
56: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
57: content of the hash will be under the heading "Big Hash".
58:
59: Big Hash contains, among other things, how resources are related
60: to each other (next/previous), what resources are maps, which
61: resources are being chosen to not show to the student (for random
62: selection), and a lot of other things that can take a lot of time
63: to compute due to the amount of data that needs to be collected and
64: processed.
65:
66: Apache::lonnavmaps provides an object model for manipulating this
67: information in a higher-level fashion than directly manipulating
68: the hash. It also provides access to several auxilary functions
69: that aren't necessarily stored in the Big Hash, but are a per-
70: resource sort of value, like whether there is any feedback on
71: a given resource.
72:
73: Apache::lonnavmaps also abstracts away branching, and someday,
74: conditions, for the times where you don't really care about those
75: things.
76:
77: Apache::lonnavmaps also provides fairly powerful routines for
78: rendering navmaps, and last but not least, provides the navmaps
79: view for when the user clicks the NAV button.
80:
81: B<Note>: Apache::lonnavmaps I<only> works for the "currently
82: logged in user"; if you want things like "due dates for another
83: student" lonnavmaps can not directly retrieve information like
84: that. You need the EXT function. This module can still help,
85: because many things, such as the course structure, are constant
86: between users, and Apache::lonnavmaps can help by providing
87: symbs for the EXT call.
88:
89: The rest of this file will cover the provided rendering routines,
90: which can often be used without fiddling with the navmap object at
91: all, then documents the Apache::lonnavmaps::navmap object, which
92: is the key to accessing the Big Hash information, covers the use
93: of the Iterator (which provides the logic for traversing the
94: somewhat-complicated Big Hash data structure), documents the
95: Apache::lonnavmaps::Resource objects that are returned by
96:
97: =head1 Subroutine: render
98:
99: The navmap renderer package provides a sophisticated rendering of the
100: standard navigation maps interface into HTML. The provided nav map
101: handler is actually just a glorified call to this.
102:
103: Because of the large number of parameters this function accepts,
104: instead of passing it arguments as is normal, pass it in an anonymous
105: hash with the desired options.
106:
107: The package provides a function called 'render', called as
108: Apache::lonnavmaps::render({}).
109:
110: =head2 Overview of Columns
111:
112: The renderer will build an HTML table for the navmap and return
113: it. The table consists of several columns, and a row for each
114: resource (or possibly each part). You tell the renderer how many
115: columns to create and what to place in each column, optionally using
116: one or more of the prepared columns, and the renderer will assemble
117: the table.
118:
119: Any additional generally useful column types should be placed in the
120: renderer code here, so anybody can use it anywhere else. Any code
121: specific to the current application (such as the addition of <input>
122: elements in a column) should be placed in the code of the thing using
123: the renderer.
124:
125: At the core of the renderer is the array reference COLS (see Example
126: section below for how to pass this correctly). The COLS array will
127: consist of entries of one of two types of things: Either an integer
128: representing one of the pre-packaged column types, or a sub reference
129: that takes a resource reference, a part number, and a reference to the
130: argument hash passed to the renderer, and returns a string that will
131: be inserted into the HTML representation as it.
132:
133: All other parameters are ways of either changing how the columns
134: are printing, or which rows are shown.
135:
136: The pre-packaged column names are refered to by constants in the
137: Apache::lonnavmaps namespace. The following currently exist:
138:
139: =over 4
140:
141: =item * B<Apache::lonnavmaps::resource>:
142:
143: The general info about the resource: Link, icon for the type, etc. The
144: first column in the standard nav map display. This column provides the
145: indentation effect seen in the B<NAV> screen. This column also accepts
146: the following parameters in the renderer hash:
147:
148: =over 4
149:
150: =item * B<resource_nolink>: default false
151:
152: If true, the resource will not be linked. By default, all non-folder
153: resources are linked.
154:
155: =item * B<resource_part_count>: default true
156:
157: If true, the resource will show a part count B<if> the full
158: part list is not displayed. (See "condense_parts" later.) If false,
159: the resource will never show a part count.
160:
161: =item * B<resource_no_folder_link>:
162:
163: If true, the resource's folder will not be clickable to open or close
164: it. Default is false. True implies printCloseAll is false, since you
165: can't close or open folders when this is on anyhow.
166:
167: =back
168:
169: =item * B<Apache::lonnavmaps::communication_status>:
170:
171: Whether there is discussion on the resource, email for the user, or
172: (lumped in here) perl errors in the execution of the problem. This is
173: the second column in the main nav map.
174:
175: =item * B<Apache::lonnavmaps::quick_status>:
176:
177: An icon for the status of a problem, with five possible states:
178: Correct, incorrect, open, awaiting grading (for a problem where the
179: computer's grade is suppressed, or the computer can't grade, like
180: essay problem), or none (not open yet, not a problem). The
181: third column of the standard navmap.
182:
183: =item * B<Apache::lonnavmaps::long_status>:
184:
185: A text readout of the details of the current status of the problem,
186: such as "Due in 22 hours". The fourth column of the standard navmap.
187:
188: =item * B<Apache::lonnavmaps::part_status_summary>:
189:
190: A text readout summarizing the status of the problem. If it is a
191: single part problem, will display "Correct", "Incorrect",
192: "Not yet open", "Open", "Attempted", or "Error". If there are
193: multiple parts, this will output a string that in HTML will show a
194: status of how many parts are in each status, in color coding, trying
195: to match the colors of the icons within reason.
196:
197: Note this only makes sense if you are I<not> showing parts. If
198: C<showParts> is true (see below), this column will not output
199: anything.
200:
201: =back
202:
203: If you add any others please be sure to document them here.
204:
205: An example of a column renderer that will show the ID number of a
206: resource, along with the part name if any:
207:
208: sub {
209: my ($resource, $part, $params) = @_;
210: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
211: return '<td>' . $resource->{ID} . '</td>';
212: }
213:
214: Note these functions are responsible for the TD tags, which allow them
215: to override vertical and horizontal alignment, etc.
216:
217: =head2 Parameters
218:
219: Minimally, you should be
220: able to get away with just using 'cols' (to specify the columns
221: shown), 'url' (necessary for the folders to link to the current screen
222: correctly), and possibly 'queryString' if your app calls for it. In
223: that case, maintaining the state of the folders will be done
224: automatically.
225:
226: =over 4
227:
228: =item * B<iterator: default: constructs one from %env
229:
230: A reference to a fresh ::iterator to use from the navmaps. The
231: rendering will reflect the options passed to the iterator, so you can
232: use that to just render a certain part of the course, if you like. If
233: one is not passed, the renderer will attempt to construct one from
234: env{'form.filter'} and env{'form.condition'} information, plus the
235: 'iterator_map' parameter if any.
236:
237: =item * B<iterator_map>: default: not used
238:
239: If you are letting the renderer do the iterator handling, you can
240: instruct the renderer to render only a particular map by passing it
241: the source of the map you want to process, like
242: '/res/103/jerf/navmap.course.sequence'.
243:
244: =item * B<include_top_level_map>: default: false
245:
246: If you need to include the top level map (meaning the course) in the
247: rendered output set this to true
248:
249: =item * B<navmap>: default: constructs one from %env
250:
251: A reference to a navmap, used only if an iterator is not passed in. If
252: this is necessary to make an iterator but it is not passed in, a new
253: one will be constructed based on env info. This is useful to do basic
254: error checking before passing it off to render.
255:
256: =item * B<r>: default: must be passed in
257:
258: The standard Apache response object. This must be passed to the
259: renderer or the course hash will be locked.
260:
261: =item * B<cols>: default: empty (useless)
262:
263: An array reference
264:
265: =item * B<showParts>:default true
266:
267: A flag. If true, a line for the resource itself, and a line
268: for each part will be displayed. If not, only one line for each
269: resource will be displayed.
270:
271: =item * B<condenseParts>: default true
272:
273: A flag. If true, if all parts of the problem have the same
274: status and that status is Nothing Set, Correct, or Network Failure,
275: then only one line will be displayed for that resource anyhow. If no,
276: all parts will always be displayed. If showParts is 0, this is
277: ignored.
278:
279: =item * B<jumpCount>: default: determined from %env
280:
281: A string identifying the URL to place the anchor 'curloc' at.
282: It is the responsibility of the renderer user to
283: ensure that the #curloc is in the URL. By default, determined through
284: the use of the env{} 'jump' information, and should normally "just
285: work" correctly.
286:
287: =item * B<here>: default: empty string
288:
289: A Symb identifying where to place the 'here' marker. The empty
290: string means no marker.
291:
292: =item * B<indentString>: default: 25 pixel whitespace image
293:
294: A string identifying the indentation string to use.
295:
296: =item * B<queryString>: default: empty
297:
298: A string which will be prepended to the query string used when the
299: folders are opened or closed. You can use this to pass
300: application-specific values.
301:
302: =item * B<url>: default: none
303:
304: The url the folders will link to, which should be the current
305: page. Required if the resource info column is shown, and you
306: are allowing the user to open and close folders.
307:
308: =item * B<currentJumpIndex>: default: no jumping
309:
310: Describes the currently-open row number to cause the browser to jump
311: to, because the user just opened that folder. By default, pulled from
312: the Jump information in the env{'form.*'}.
313:
314: =item * B<printKey>: default: false
315:
316: If true, print the key that appears on the top of the standard
317: navmaps.
318:
319: =item * B<printCloseAll>: default: true
320:
321: If true, print the "Close all folders" or "open all folders"
322: links.
323:
324: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
325:
326: A function that takes the resource object as its only parameter and
327: returns a true or false value. If true, the resource is displayed. If
328: false, it is simply skipped in the display.
329:
330: =item * B<suppressEmptySequences>: default: false
331:
332: If you're using a filter function, and displaying sequences to orient
333: the user, then frequently some sequences will be empty. Setting this to
334: true will cause those sequences not to display, so as not to confuse the
335: user into thinking that if the sequence is there there should be things
336: under it; for example, see the "Show Uncompleted Homework" view on the
337: B<NAV> screen.
338:
339: =item * B<suppressNavmaps>: default: false
340:
341: If true, will not display Navigate Content resources.
342:
343: =back
344:
345: =head2 Additional Info
346:
347: In addition to the parameters you can pass to the renderer, which will
348: be passed through unchange to the column renderers, the renderer will
349: generate the following information which your renderer may find
350: useful:
351:
352: =over 4
353:
354: =item * B<counter>:
355:
356: Contains the number of rows printed. Useful after calling the render
357: function, as you can detect whether anything was printed at all.
358:
359: =item * B<isNewBranch>:
360:
361: Useful for renderers: If this resource is currently the first resource
362: of a new branch, this will be true. The Resource column (leftmost in the
363: navmaps screen) uses this to display the "new branch" icon
364:
365: =back
366:
367: =cut
368:
369:
370: =head1 SUBROUTINES
371:
372: =over
373:
374: =item update()
375:
376: =item addToFilter()
377:
378: Convenience functions: Returns a string that adds or subtracts
379: the second argument from the first hash, appropriate for the
380: query string that determines which folders to recurse on
381:
382: =item removeFromFilter()
383:
384: =item getLinkForResource()
385:
386: Convenience function: Given a stack returned from getStack on the iterator,
387: return the correct src() value.
388:
389: =item getDescription()
390:
391: Convenience function: This separates the logic of how to create
392: the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
393: etc.) into a separate function. It takes a resource object as the
394: first parameter, and the part number of the resource as the second.
395: It's basically a big switch statement on the status of the resource.
396:
397: =item dueInLessThan24Hours()
398:
399: Convenience function, so others can use it: Is the problem due in less than 24 hours, and still can be done?
400:
401: =item lastTry()
402:
403: Convenience function, so others can use it: Is there only one try remaining for the
404: part, with more than one try to begin with, not due yet and still can be done?
405:
406: =item advancedUser()
407:
408: This puts a human-readable name on the env variable.
409:
410: =item timeToHumanString()
411:
412: timeToHumanString takes a time number and converts it to a
413: human-readable representation, meant to be used in the following
414: manner:
415:
416: =over 4
417:
418: =item * print "Due $timestring"
419:
420: =item * print "Open $timestring"
421:
422: =item * print "Answer available $timestring"
423:
424: =back
425:
426: Very, very, very, VERY English-only... goodness help a localizer on
427: this func...
428:
429: =item resource()
430:
431: returns 0
432:
433: =item communication_status()
434:
435: returns 1
436:
437: =item quick_status()
438:
439: returns 2
440:
441: =item long_status()
442:
443: returns 3
444:
445: =item part_status_summary()
446:
447: returns 4
448:
449: =item render_resource()
450:
451: =item render_communication_status()
452:
453: =item render_quick_status()
454:
455: =item render_long_status()
456:
457: =item render_parts_summary_status()
458:
459: =item setDefault()
460:
461: =item cmp_title()
462:
463: =item render()
464:
465: =item add_linkitem()
466:
467: =item show_linkitems()
468:
469: =back
470:
471: =cut
472:
473: package Apache::lonnavmaps;
474:
475: use strict;
476: use GDBM_File;
477: use Apache::loncommon();
478: use Apache::lonenc();
479: use Apache::lonlocal;
480: use Apache::lonnet;
481: use Apache::lonmap;
482:
483: use POSIX qw (floor strftime);
484: use Time::HiRes qw( gettimeofday tv_interval );
485: use LONCAPA;
486: use DateTime();
487:
488: # For debugging
489:
490: # use Data::Dumper;
491:
492:
493: # symbolic constants
494: sub SYMB { return 1; }
495: sub URL { return 2; }
496: sub NOTHING { return 3; }
497:
498: # Some data
499:
500: my $resObj = "Apache::lonnavmaps::resource";
501:
502: # Keep these mappings in sync with lonquickgrades, which usesthe colors
503: # instead of the icons.
504: my %statusIconMap =
505: (
506: $resObj->CLOSED => '',
507: $resObj->OPEN => 'navmap.open.gif',
508: $resObj->CORRECT => 'navmap.correct.gif',
509: $resObj->PARTIALLY_CORRECT => 'navmap.partial.gif',
510: $resObj->INCORRECT => 'navmap.wrong.gif',
511: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
512: $resObj->ERROR => ''
513: );
514:
515: my %iconAltTags = #texthash does not work here
516: ( 'navmap.correct.gif' => 'Correct',
517: 'navmap.wrong.gif' => 'Incorrect',
518: 'navmap.open.gif' => 'Is Open',
519: 'navmap.partial.gif' => 'Partially Correct',
520: 'navmap.ellipsis.gif' => 'Attempted',
521: );
522:
523: # Defines a status->color mapping, null string means don't color
524: my %colormap =
525: ( $resObj->NETWORK_FAILURE => '',
526: $resObj->CORRECT => '',
527: $resObj->EXCUSED => '#3333FF',
528: $resObj->PAST_DUE_ANSWER_LATER => '',
529: $resObj->PAST_DUE_NO_ANSWER => '',
530: $resObj->ANSWER_OPEN => '#006600',
531: $resObj->OPEN_LATER => '',
532: $resObj->TRIES_LEFT => '',
533: $resObj->INCORRECT => '',
534: $resObj->OPEN => '',
535: $resObj->NOTHING_SET => '',
536: $resObj->ATTEMPTED => '',
537: $resObj->CREDIT_ATTEMPTED => '',
538: $resObj->ANSWER_SUBMITTED => '',
539: $resObj->PARTIALLY_CORRECT => '#006600'
540: );
541: # And a special case in the nav map; what to do when the assignment
542: # is not yet done and due in less than 24 hours
543: my $hurryUpColor = "#FF0000";
544:
545: sub addToFilter {
546: my $hashIn = shift;
547: my $addition = shift;
548: my %hash = %$hashIn;
549: $hash{$addition} = 1;
550:
551: return join (",", keys(%hash));
552: }
553:
554: sub removeFromFilter {
555: my $hashIn = shift;
556: my $subtraction = shift;
557: my %hash = %$hashIn;
558:
559: delete $hash{$subtraction};
560: return join(",", keys(%hash));
561: }
562:
563: sub getLinkForResource {
564: my $stack = shift;
565: my $res;
566:
567: # Check to see if there are any pages in the stack
568: foreach $res (@$stack) {
569: if (defined($res)) {
570: my $anchor;
571: if ($res->is_page()) {
572: foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; } }
573: $anchor=&escape($anchor->shown_symb());
574: return ($res->link(),$res->shown_symb(),$anchor);
575: }
576: # in case folder was skipped over as "only sequence"
577: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
578: if ($map=~/\.page$/) {
579: my $url=&Apache::lonnet::clutter($map);
580: $anchor=&escape($res->shown_symb());
581: return ($url,$res->shown_symb(),$anchor);
582: }
583: }
584: }
585:
586: # Failing that, return the src of the last resource that is defined
587: # (when we first recurse on a map, it puts an undefined resource
588: # on the bottom because $self->{HERE} isn't defined yet, and we
589: # want the src for the map anyhow)
590: foreach my $item (@$stack) {
591: if (defined($item)) { $res = $item; }
592: }
593:
594: if ($res) {
595: return ($res->link(),$res->shown_symb());
596: }
597: return;
598: }
599:
600:
601:
602: sub getDescription {
603: my $res = shift;
604: my $part = shift;
605: my $status = $res->status($part);
606:
607: my $open = $res->opendate($part);
608: my $due = $res->duedate($part);
609: my $answer = $res->answerdate($part);
610:
611: if ($status == $res->NETWORK_FAILURE) {
612: return &mt("Having technical difficulties; please check status later");
613: }
614: if ($status == $res->NOTHING_SET) {
615: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Not currently assigned.",$res->symb(),'opendate'),$part);
616: }
617: if ($status == $res->OPEN_LATER) {
618: return &mt("Open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($open,'start'),$res->symb(),'opendate',$part));
619: }
620: if ($res->simpleStatus($part) == $res->OPEN) {
621: unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
622: my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
623: if ($slot_status == $res->UNKNOWN) {
624: return &mt('Reservation status unknown');
625: } elsif ($slot_status == $res->RESERVED) {
626: return &mt('Reserved - ends [_1]',
627: timeToHumanString($slot_time,'end'));
628: } elsif ($slot_status == $res->RESERVED_LOCATION) {
629: return &mt('Reserved - specific location(s) - ends [_1]',
630: timeToHumanString($slot_time,'end'));
631: } elsif ($slot_status == $res->RESERVED_LATER) {
632: return &mt('Reserved - next open [_1]',
633: timeToHumanString($slot_time,'start'));
634: } elsif ($slot_status == $res->RESERVABLE) {
635: return &mt('Reservable, reservations close [_1]',
636: timeToHumanString($slot_time,'end'));
637: } elsif ($slot_status == $res->RESERVABLE_LATER) {
638: return &mt('Reservable, reservations open [_1]',
639: timeToHumanString($slot_time,'start'));
640: } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
641: return &mt('Reserve a time/place to work');
642: } elsif ($slot_status == $res->NOTRESERVABLE) {
643: return &mt('Reservation not available');
644: } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
645: return &mt('Submission in grading queue');
646: }
647: }
648: }
649: if ($status == $res->OPEN) {
650: if ($due) {
651: if ($res->is_practice()) {
652: return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'duedate',$part));
653: } else {
654: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part));
655: }
656: } else {
657: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part);
658: }
659: }
660: if ($status == $res->PAST_DUE_ANSWER_LATER) {
661: return &mt("Answer open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($answer,'start'),$res->symb(),'answerdate',$part));
662: }
663: if ($status == $res->PAST_DUE_NO_ANSWER) {
664: if ($res->is_practice()) {
665: return &mt("Closed [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'answerdate,duedate',$part));
666: } else {
667: return &mt("Was due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'answerdate,duedate',$part));
668: }
669: }
670: if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
671: && $res->handgrade($part) ne 'yes') {
672: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Answer available"),$res->symb(),'answerdate,duedate',$part);
673: }
674: if ($status == $res->EXCUSED) {
675: return &mt("Excused by instructor");
676: }
677: if ($status == $res->ATTEMPTED) {
678: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
679: return &mt("Survey submission recorded");
680: } else {
681: return &mt("Answer submitted, not yet graded");
682: }
683: }
684: if ($status == $res->CREDIT_ATTEMPTED) {
685: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
686: return &mt("Credit for survey submission");
687: }
688: }
689: if ($status == $res->TRIES_LEFT) {
690: my $tries = $res->tries($part);
691: my $maxtries = $res->maxtries($part);
692: my $triesString = "";
693: if ($tries && $maxtries) {
694: $triesString = '<font size="-1"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></font>';
695: if ($maxtries > 1 && $maxtries - $tries == 1) {
696: $triesString = "<b>$triesString</b>";
697: }
698: }
699: if ($due) {
700: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)) .
701: " $triesString";
702: } else {
703: return &Apache::lonhtmlcommon::direct_parm_link(&mt("No due date"),$res->symb(),'duedate',$part)." $triesString";
704: }
705: }
706: if ($status == $res->ANSWER_SUBMITTED) {
707: return &mt('Answer submitted');
708: }
709: }
710:
711:
712: sub dueInLessThan24Hours {
713: my $res = shift;
714: my $part = shift;
715: my $status = $res->status($part);
716:
717: return ($status == $res->OPEN() ||
718: $status == $res->TRIES_LEFT()) &&
719: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
720: $res->duedate($part) > time();
721: }
722:
723:
724: sub lastTry {
725: my $res = shift;
726: my $part = shift;
727:
728: my $tries = $res->tries($part);
729: my $maxtries = $res->maxtries($part);
730: return $tries && $maxtries && $maxtries > 1 &&
731: $maxtries - $tries == 1 && $res->duedate($part) &&
732: $res->duedate($part) > time();
733: }
734:
735:
736: sub advancedUser {
737: return $env{'request.role.adv'};
738: }
739:
740: sub timeToHumanString {
741: my ($time,$type,$format) = @_;
742:
743: # zero, '0' and blank are bad times
744: if (!$time) {
745: return &mt('never');
746: }
747: unless (&Apache::lonlocal::current_language()=~/^en/) {
748: return &Apache::lonlocal::locallocaltime($time);
749: }
750: my $now = time();
751:
752: # Positive = future
753: my $delta = $time - $now;
754:
755: my $minute = 60;
756: my $hour = 60 * $minute;
757: my $day = 24 * $hour;
758: my $week = 7 * $day;
759: my $inPast = 0;
760:
761: # Logic in comments:
762: # Is it now? (extremely unlikely)
763: if ( $delta == 0 ) {
764: return "this instant";
765: }
766:
767: if ($delta < 0) {
768: $inPast = 1;
769: $delta = -$delta;
770: }
771:
772: if ( $delta > 0 ) {
773:
774: my $tense = $inPast ? " ago" : "";
775: my $prefix = $inPast ? "" : "in ";
776:
777: # Less than a minute
778: if ( $delta < $minute ) {
779: if ($delta == 1) { return "${prefix}1 second$tense"; }
780: return "$prefix$delta seconds$tense";
781: }
782:
783: # Less than an hour
784: if ( $delta < $hour ) {
785: # If so, use minutes; or minutes, seconds (if format requires)
786: my $minutes = floor($delta / 60);
787: if (($format ne '') && ($format =~ /\%(T|S)/)) {
788: my $display;
789: if ($minutes == 1) {
790: $display = "${prefix}1 minute";
791: } else {
792: $display = "$prefix$minutes minutes";
793: }
794: my $seconds = $delta % $minute;
795: if ($seconds == 0) {
796: $display .= $tense;
797: } elsif ($seconds == 1) {
798: $display .= ", 1 second$tense";
799: } else {
800: $display .= ", $seconds seconds$tense";
801: }
802: return $display;
803: }
804: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
805: return "$prefix$minutes minutes$tense";
806: }
807:
808: # Is it less than 24 hours away? If so,
809: # display hours + minutes, (and + seconds, if format specified it)
810: if ( $delta < $hour * 24) {
811: my $hours = floor($delta / $hour);
812: my $minutes = floor(($delta % $hour) / $minute);
813: my $hourString = "$hours hours";
814: my $minuteString = ", $minutes minutes";
815: if ($hours == 1) {
816: $hourString = "1 hour";
817: }
818: if ($minutes == 1) {
819: $minuteString = ", 1 minute";
820: }
821: if ($minutes == 0) {
822: $minuteString = "";
823: }
824: if (($format ne '') && ($format =~ /\%(T|S)/)) {
825: my $display = "$prefix$hourString$minuteString";
826: my $seconds = $delta-(($hours * $hour)+($minutes * $minute));
827: if ($seconds == 0) {
828: $display .= $tense;
829: } elsif ($seconds == 1) {
830: $display .= ", 1 second$tense";
831: } else {
832: $display .= ", $seconds seconds$tense";
833: }
834: return $display;
835: }
836: return "$prefix$hourString$minuteString$tense";
837: }
838:
839: # Date/time is more than 24 hours away
840:
841: my $dt = DateTime->from_epoch(epoch => $time)
842: ->set_time_zone(&Apache::lonlocal::gettimezone());
843:
844: # If there's a caller supplied format, use it, unless it only displays
845: # H:M:S or H:M.
846:
847: if (($format ne '') && ($format ne '%T') && ($format ne '%R')) {
848: my $timeStr = $dt->strftime($format);
849: return $timeStr.' ('.$dt->time_zone_short_name().')';
850: }
851:
852: # Less than 5 days away, display day of the week and
853: # HH:MM
854:
855: if ( $delta < $day * 5 ) {
856: my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
857: $timeStr =~ s/12:00 am/00:00/;
858: $timeStr =~ s/12:00 pm/noon/;
859: return ($inPast ? "last " : "this ") .
860: $timeStr;
861: }
862:
863: my $conjunction='on';
864: if ($type eq 'start') {
865: $conjunction='at';
866: } elsif ($type eq 'end') {
867: $conjunction='by';
868: }
869: # Is it this year?
870: my $dt_now = DateTime->from_epoch(epoch => $now)
871: ->set_time_zone(&Apache::lonlocal::gettimezone());
872: if ( $dt->year() == $dt_now->year()) {
873: # Return on Month Day, HH:MM meridian
874: my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
875: $timeStr =~ s/12:00 am/00:00/;
876: $timeStr =~ s/12:00 pm/noon/;
877: return $timeStr;
878: }
879:
880: # Not this year, so show the year
881: my $timeStr =
882: $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
883: $timeStr =~ s/12:00 am/00:00/;
884: $timeStr =~ s/12:00 pm/noon/;
885: return $timeStr;
886: }
887: }
888:
889:
890: sub resource { return 0; }
891: sub communication_status { return 1; }
892: sub quick_status { return 2; }
893: sub long_status { return 3; }
894: sub part_status_summary { return 4; }
895:
896: sub render_resource {
897: my ($resource, $part, $params) = @_;
898:
899: my $nonLinkedText = ''; # stuff after resource title not in link
900:
901: my $link = $params->{"resourceLink"};
902:
903: # The URL part is not escaped at this point, but the symb is...
904:
905: my $src = $resource->src();
906: my $it = $params->{"iterator"};
907: my $filter = $it->{FILTER};
908:
909: my $title = $resource->compTitle();
910:
911: my $partLabel = "";
912: my $newBranchText = "";
913: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
914: # If this is a new branch, label it so
915: if ($params->{'isNewBranch'}) {
916: $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
917: }
918:
919: # links to open and close the folder
920:
921: my $whitespace = $location.'/whitespace_21.gif';
922: my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
923: my $linkclose = "</a>";
924:
925: # Default icon: unknown page
926: my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
927:
928: if ($resource->is_problem()) {
929: if ($part eq '0' || $params->{'condensed'}) {
930: $icon = '<img class="LC_contentImage" src="'.$location.'/';
931: if ($resource->is_task()) {
932: $icon .= 'task.gif" alt="'.&mt('Task');
933: } else {
934: $icon .= 'problem.gif" alt="'.&mt('Problem');
935: }
936: $icon .='" />';
937: } else {
938: $icon = $params->{'indentString'};
939: }
940: } else {
941: $icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
942: }
943:
944: # Display the correct map icon to open or shut map
945: if ($resource->is_map()) {
946: my $mapId = $resource->map_pc();
947: my $nowOpen = !defined($filter->{$mapId});
948: if ($it->{CONDITION}) {
949: $nowOpen = !$nowOpen;
950: }
951:
952: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
953: my $title=$resource->title;
954: $title=~s/\"/\&qout;/g;
955: if (!$params->{'resource_no_folder_link'}) {
956: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
957: $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
958: ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
959: .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
960: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
961: $params->{'queryString'} . '&filter=';
962: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
963: addToFilter($filter, $mapId) :
964: removeFromFilter($filter, $mapId);
965: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
966: . $params->{'hereType'} . '&here=' .
967: &escape($params->{'here'}) .
968: '&jump=' .
969: &escape($resource->symb()) .
970: "&folderManip=1\">";
971:
972: } else {
973: # Don't allow users to manipulate folder
974: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
975: $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
976:
977: $linkopen = "";
978: $linkclose = "";
979: }
980: }
981:
982: if ($resource->randomout()) {
983: $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
984: }
985: if (!$resource->condval()) {
986: $nonLinkedText .= ' <span class="LC_info">('.&mt('conditionally hidden').')</span> ';
987: }
988: if (($resource->is_practice()) && ($resource->is_raw_problem())) {
989: $nonLinkedText .=' <font color="green"><b>'.&mt('not graded').'</b></font>';
990: }
991:
992: # We're done preparing and finally ready to start the rendering
993: my $result = '<td class="LC_middle">';
994: my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
995:
996: my $indentLevel = $params->{'indentLevel'};
997: if ($newBranchText) { $indentLevel--; }
998:
999: # print indentation
1000: for (my $i = 0; $i < $indentLevel; $i++) {
1001: $result .= $params->{'indentString'};
1002: }
1003:
1004: # Decide what to display
1005: $result .= "$newBranchText$linkopen$icon$linkclose";
1006:
1007: my $curMarkerBegin = '';
1008: my $curMarkerEnd = '';
1009:
1010: # Is this the current resource?
1011: if (!$params->{'displayedHereMarker'} &&
1012: $resource->symb() eq $params->{'here'} ) {
1013: $curMarkerBegin = '<span class="LC_current_nav_location">';
1014: $curMarkerEnd = '</span>';
1015: $params->{'displayedHereMarker'} = 1;
1016: }
1017:
1018: if ($resource->is_problem() && $part ne '0' &&
1019: !$params->{'condensed'}) {
1020: my $displaypart=$resource->part_display($part);
1021: $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1022: if ($link!~/\#/) { $link.='#'.&escape($part); }
1023: $title = "";
1024: }
1025:
1026: if ($params->{'condensed'} && $resource->countParts() > 1) {
1027: $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1028: }
1029:
1030: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1031: $result .= "$curMarkerBegin<a href=\"$link\">$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1032: } else {
1033: $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1034: }
1035:
1036: return $result;
1037: }
1038:
1039: sub render_communication_status {
1040: my ($resource, $part, $params) = @_;
1041: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1042:
1043: my $link = $params->{"resourceLink"};
1044: my $linkopen = "<a href=\"$link\">";
1045: my $linkclose = "</a>";
1046: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1047: if ($resource->hasDiscussion()) {
1048: $discussionHTML = $linkopen .
1049: '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" title="'.&mt('New Discussion').'"/>' .
1050: $linkclose;
1051: }
1052:
1053: if ($resource->getFeedback()) {
1054: my $feedback = $resource->getFeedback();
1055: foreach my $msgid (split(/\,/, $feedback)) {
1056: if ($msgid) {
1057: $feedbackHTML .= ' <a href="/adm/email?display='
1058: . &escape($msgid) . '">'
1059: . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" title="'.&mt('New E-mail').'"/></a>';
1060: }
1061: }
1062: }
1063:
1064: if ($resource->getErrors()) {
1065: my $errors = $resource->getErrors();
1066: my $errorcount = 0;
1067: foreach my $msgid (split(/,/, $errors)) {
1068: last if ($errorcount>=10); # Only output 10 bombs maximum
1069: if ($msgid) {
1070: $errorcount++;
1071: $errorHTML .= ' <a href="/adm/email?display='
1072: . &escape($msgid) . '">'
1073: . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" title="'.&mt('New Error').'"/></a>';
1074: }
1075: }
1076: }
1077:
1078: if ($params->{'multipart'} && $part != '0') {
1079: $discussionHTML = $feedbackHTML = $errorHTML = '';
1080: }
1081: return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML </td>";
1082:
1083: }
1084: sub render_quick_status {
1085: my ($resource, $part, $params) = @_;
1086: my $result = "";
1087: my $firstDisplayed = !$params->{'condensed'} &&
1088: $params->{'multipart'} && $part eq "0";
1089:
1090: my $link = $params->{"resourceLink"};
1091: my $linkopen = "<a href=\"$link\">";
1092: my $linkclose = "</a>";
1093:
1094: $result .= '<td class="LC_middle">';
1095: if ($resource->is_problem() &&
1096: !$firstDisplayed) {
1097: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1098: my $alt = $iconAltTags{$icon};
1099: if ($icon) {
1100: my $location=
1101: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1102: $result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;
1103: } else {
1104: $result .= " ";
1105: }
1106: } else { # not problem, no icon
1107: $result .= " ";
1108: }
1109: $result .= "</td>\n";
1110: return $result;
1111: }
1112: sub render_long_status {
1113: my ($resource, $part, $params) = @_;
1114: my $result = '<td class="LC_middle LC_right">';
1115: my $firstDisplayed = !$params->{'condensed'} &&
1116: $params->{'multipart'} && $part eq "0";
1117:
1118: my $color;
1119: if ($resource->is_problem() || $resource->is_practice()) {
1120: $color = $colormap{$resource->status};
1121:
1122: if (dueInLessThan24Hours($resource, $part) ||
1123: lastTry($resource, $part)) {
1124: $color = $hurryUpColor;
1125: }
1126: }
1127:
1128: if ($resource->kind() eq "res" &&
1129: $resource->is_raw_problem() &&
1130: !$firstDisplayed) {
1131: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1132: $result .= getDescription($resource, $part);
1133: if ($color) {$result .= "</b></font>"; }
1134: }
1135: if ($resource->is_map()) {
1136: if (&Apache::lonnet::allowed('mdc')) {
1137: if ($resource->symb=~/\_\_\_[^\_]+\_\_\_uploaded/) {
1138: $result.=" <a href='/adm/coursedocs?command=direct&symb=".&escape($resource->symb())."'>".
1139: "<span class='LC_setting'>".&mt("Edit Content").'</span></a> ';
1140: }
1141: }
1142: }
1143: if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1144: $result .= &mt('(randomly select [_1])', $resource->randompick());
1145: }
1146: if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
1147: $result .= &mt('(randomly ordered)');
1148: }
1149:
1150: # Debugging code
1151: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1152: # ' - Part: ' . $part;
1153:
1154: $result .= "</td>\n";
1155:
1156: return $result;
1157: }
1158:
1159: # Colors obtained by taking the icons, matching the colors, and
1160: # possibly reducing the Value (HSV) of the color, if it's too bright
1161: # for text, generally by one third or so.
1162: my %statusColors =
1163: (
1164: $resObj->CLOSED => '#000000',
1165: $resObj->OPEN => '#998b13',
1166: $resObj->CORRECT => '#26933f',
1167: $resObj->INCORRECT => '#c48207',
1168: $resObj->ATTEMPTED => '#a87510',
1169: $resObj->ERROR => '#000000'
1170: );
1171: my %statusStrings =
1172: (
1173: $resObj->CLOSED => 'Not yet open',
1174: $resObj->OPEN => 'Open',
1175: $resObj->CORRECT => 'Correct',
1176: $resObj->INCORRECT => 'Incorrect',
1177: $resObj->ATTEMPTED => 'Attempted',
1178: $resObj->ERROR => 'Network Error'
1179: );
1180: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1181:
1182: sub render_parts_summary_status {
1183: my ($resource, $part, $params) = @_;
1184: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1185: if ($params->{showParts}) {
1186: return '<td></td>';
1187: }
1188:
1189: my $td = "<td align='right'>\n";
1190: my $endtd = "</td>\n";
1191: my @probs;
1192:
1193: if ($resource->contains_problem) {
1194: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1195: } else {
1196: @probs=($resource);
1197: }
1198: my $return;
1199: my %overallstatus;
1200: my $totalParts;
1201: foreach my $resource (@probs) {
1202: # If there is a single part, just show the simple status
1203: if ($resource->singlepart()) {
1204: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1205: $overallstatus{$status}++;
1206: $totalParts++;
1207: next;
1208: }
1209: # Now we can be sure the $part doesn't really matter.
1210: my $statusCount = $resource->simpleStatusCount();
1211: my @counts;
1212: foreach my $status (@statuses) {
1213: # decouple display order from the simpleStatusCount order
1214: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1215: if ($statusCount->[$slot]) {
1216: $overallstatus{$status}+=$statusCount->[$slot];
1217: $totalParts+=$statusCount->[$slot];
1218: }
1219: }
1220: }
1221: $return.= $td . $totalParts . ' parts: ';
1222: foreach my $status (@statuses) {
1223: if ($overallstatus{$status}) {
1224: $return.="<font color='" . $statusColors{$status} .
1225: "'>" . $overallstatus{$status} . ' '
1226: . $statusStrings{$status} . "</font>";
1227: }
1228: }
1229: $return.= $endtd;
1230: return $return;
1231: }
1232:
1233: my @preparedColumns = (\&render_resource, \&render_communication_status,
1234: \&render_quick_status, \&render_long_status,
1235: \&render_parts_summary_status);
1236:
1237: sub setDefault {
1238: my ($val, $default) = @_;
1239: if (!defined($val)) { return $default; }
1240: return $val;
1241: }
1242:
1243: sub cmp_title {
1244: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1245: $atitle=~s/^\s*//;
1246: $btitle=~s/^\s*//;
1247: return $atitle cmp $btitle;
1248: }
1249:
1250: sub render {
1251: my $args = shift;
1252: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1253: my $result = '';
1254: # Configure the renderer.
1255: my $cols = $args->{'cols'};
1256: if (!defined($cols)) {
1257: # no columns, no nav maps.
1258: return '';
1259: }
1260: my $navmap;
1261: if (defined($args->{'navmap'})) {
1262: $navmap = $args->{'navmap'};
1263: }
1264:
1265: my $r = $args->{'r'};
1266: my $queryString = $args->{'queryString'};
1267: my $jump = $args->{'jump'};
1268: my $here = $args->{'here'};
1269: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1270: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1271: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1272: # before the current resource when using #current
1273:
1274: # If we were passed 'here' information, we are not rendering
1275: # after a folder manipulation, and we were not passed an
1276: # iterator, make sure we open the folders to show the "here"
1277: # marker
1278: my $filterHash = {};
1279: # Figure out what we're not displaying
1280: foreach my $item (split(/\,/, $env{"form.filter"})) {
1281: if ($item) {
1282: $filterHash->{$item} = "1";
1283: }
1284: }
1285:
1286: # Filter: Remember filter function and add our own filter: Refuse
1287: # to show hidden resources unless the user can see them.
1288: my $userCanSeeHidden = advancedUser();
1289: my $filterFunc = setDefault($args->{'filterFunc'},
1290: sub {return 1;});
1291: if (!$userCanSeeHidden) {
1292: # Without renaming the filterfunc, the server seems to go into
1293: # an infinite loop
1294: my $oldFilterFunc = $filterFunc;
1295: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1296: &$oldFilterFunc($res);};
1297: }
1298:
1299: my $condition = 0;
1300: if ($env{'form.condition'}) {
1301: $condition = 1;
1302: }
1303:
1304: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1305: # Step 1: Check to see if we have a navmap
1306: if (!defined($navmap)) {
1307: $navmap = Apache::lonnavmaps::navmap->new();
1308: if (!defined($navmap)) {
1309: # no longer in course
1310: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1311: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1312: }
1313: }
1314:
1315: # Step two: Locate what kind of here marker is necessary
1316: # Determine where the "here" marker is and where the screen jumps to.
1317:
1318: if ($env{'form.postsymb'} ne '') {
1319: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1320: } elsif ($env{'form.postdata'} ne '') {
1321: # couldn't find a symb, is there a URL?
1322: my $currenturl = $env{'form.postdata'};
1323: #$currenturl=~s/^http\:\/\///;
1324: #$currenturl=~s/^[^\/]+//;
1325:
1326: $here = $jump = &Apache::lonnet::symbread($currenturl);
1327: }
1328: if ($here eq '') {
1329: my $last;
1330: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1331: &GDBM_READER(),0640)) {
1332: $last=$hash{'last_known'};
1333: untie(%hash);
1334: }
1335: if ($last) { $here = $jump = $last; }
1336: }
1337:
1338: # Step three: Ensure the folders are open
1339: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1340: my $curRes;
1341: my $found = 0;
1342:
1343: # We only need to do this if we need to open the maps to show the
1344: # current position. This will change the counter so we can't count
1345: # for the jump marker with this loop.
1346: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1347: if (ref($curRes) && $curRes->symb() eq $here) {
1348: my $mapStack = $mapIterator->getStack();
1349:
1350: # Ensure the parent maps are open
1351: for my $map (@{$mapStack}) {
1352: if ($condition) {
1353: undef $filterHash->{$map->map_pc()};
1354: } else {
1355: $filterHash->{$map->map_pc()} = 1;
1356: }
1357: }
1358: $found = 1;
1359: }
1360: }
1361: }
1362:
1363: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1364: # If this is a click on a folder or something, we want to preserve the "here"
1365: # from the querystring, and get the new "jump" marker
1366: $here = $env{'form.here'};
1367: $jump = $env{'form.jump'};
1368: }
1369:
1370: my $it = $args->{'iterator'};
1371: if (!defined($it)) {
1372: # Construct a default iterator based on $env{'form.'} information
1373:
1374: # Step 1: Check to see if we have a navmap
1375: if (!defined($navmap)) {
1376: $navmap = Apache::lonnavmaps::navmap->new();
1377: if (!defined($navmap)) {
1378: # no longer in course
1379: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1380: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1381: }
1382: }
1383:
1384: # See if we're being passed a specific map
1385: if ($args->{'iterator_map'}) {
1386: my $map = $args->{'iterator_map'};
1387: $map = $navmap->getResourceByUrl($map);
1388: my $firstResource = $map->map_start();
1389: my $finishResource = $map->map_finish();
1390:
1391: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1392: } else {
1393: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1394: }
1395: }
1396:
1397:
1398: # (re-)Locate the jump point, if any
1399: # Note this does not take filtering or hidden into account... need
1400: # to be fixed?
1401: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1402: my $curRes;
1403: my $foundJump = 0;
1404: my $counter = 0;
1405:
1406: while (($curRes = $mapIterator->next()) && !$foundJump) {
1407: if (ref($curRes)) { $counter++; }
1408:
1409: if (ref($curRes) && $jump eq $curRes->symb()) {
1410:
1411: # This is why we have to use the main iterator instead of the
1412: # potentially faster DFS: The count has to be the same, so
1413: # the order has to be the same, which DFS won't give us.
1414: $args->{'currentJumpIndex'} = $counter;
1415: $foundJump = 1;
1416: }
1417: }
1418:
1419: my $showParts = setDefault($args->{'showParts'}, 1);
1420: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1421: # keeps track of when the current resource is found,
1422: # so we can back up a few and put the anchor above the
1423: # current resource
1424: my $printKey = $args->{'printKey'};
1425: my $printCloseAll = $args->{'printCloseAll'};
1426: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1427:
1428: # Print key?
1429: if ($printKey) {
1430: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1431: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1432: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1433: if ($navmap->{LAST_CHECK}) {
1434: $result .=
1435: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
1436: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1437: '</td><td align="center" valign="bottom"> '.
1438: '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
1439: '</td>';
1440: } else {
1441: $result .= '<td align="center" valign="bottom"> '.
1442: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1443: ' <img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
1444: '</td>';
1445: }
1446:
1447: $result .= '</tr></table>';
1448: }
1449:
1450: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1451: my ($link,$text);
1452: if ($condition) {
1453: $link='navmaps?condition=0&filter=&'.$queryString.
1454: '&here='.&escape($here);
1455: $text='Close all folders';
1456: } else {
1457: $link='navmaps?condition=1&filter=&'.$queryString.
1458: '&here='.&escape($here);
1459: $text='Open all folders';
1460: }
1461: if ($env{'form.register'}) {
1462: $link .= '&register='.$env{'form.register'};
1463: }
1464: if ($args->{'caller'} eq 'navmapsdisplay') {
1465: &add_linkitem($args->{'linkitems'},'changefolder',
1466: "location.href='$link'",$text);
1467: } else {
1468: $result.= '<a href="'.$link.'">'.&mt($text).'</a>';
1469: }
1470: $result .= "\n";
1471: }
1472:
1473: # Check for any unread discussions in all resources.
1474: if ($args->{'caller'} eq 'navmapsdisplay') {
1475: &add_linkitem($args->{'linkitems'},'clearbubbles',
1476: 'document.clearbubbles.submit()',
1477: 'Mark all posts read');
1478: my $time=time;
1479: $result .= (<<END);
1480: <form name="clearbubbles" method="post" action="/adm/feedback">
1481: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1482: <input type="hidden" name="navtime" value="$time" />
1483: END
1484: if ($env{'form.register'}) {
1485: $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
1486: }
1487: if ($args->{'sort'} eq 'discussion') {
1488: my $totdisc = 0;
1489: my $haveDisc = '';
1490: my @allres=$navmap->retrieveResources();
1491: foreach my $resource (@allres) {
1492: if ($resource->hasDiscussion()) {
1493: $haveDisc .= $resource->wrap_symb().':';
1494: $totdisc ++;
1495: }
1496: }
1497: if ($totdisc > 0) {
1498: $haveDisc =~ s/:$//;
1499: $result .= (<<END);
1500: <input type="hidden" name="navmaps" value="$haveDisc" />
1501: </form>
1502: END
1503: }
1504: }
1505: $result.='</form>';
1506: if (&Apache::lonnet::allowed('mdc',$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 .= '<table><tr><td>'.
1520: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td>';
1521: $result .= '<td> </td>';
1522: $result.='<td class="LC_middle">'.&mt('Tools:').'</td>';
1523: $result.=&show_linkitems_toolbar($args->{'linkitems'});
1524: if ($args->{'sort_html'}) {
1525: $result.='<td> </td><td> </td><td> </td>'.
1526: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1527: }
1528: $result .= '</table>';
1529: } elsif ($args->{'sort_html'}) {
1530: $result.=$args->{'sort_html'};
1531: }
1532:
1533: #$result .= "<br />\n";
1534: if ($r) {
1535: $r->print($result);
1536: $r->rflush();
1537: $result = "";
1538: }
1539: # End parameter setting
1540:
1541: $result .= "<br />\n";
1542:
1543: # Data
1544: $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");
1545:
1546: my $res = "Apache::lonnavmaps::resource";
1547: my %condenseStatuses =
1548: ( $res->NETWORK_FAILURE => 1,
1549: $res->NOTHING_SET => 1,
1550: $res->CORRECT => 1 );
1551:
1552: # Shared variables
1553: $args->{'counter'} = 0; # counts the rows
1554: $args->{'indentLevel'} = 0;
1555: $args->{'isNewBranch'} = 0;
1556: $args->{'condensed'} = 0;
1557:
1558: my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1559: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1560: $args->{'displayedHereMarker'} = 0;
1561:
1562: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1563: # since structure actually doesn't matter, except what map has what resources.
1564: if ($args->{'suppressEmptySequences'}) {
1565: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1566: $it->{FIRST_RESOURCE},
1567: $it->{FINISH_RESOURCE},
1568: {}, undef, 1);
1569: my $depth = 0;
1570: $dfsit->next();
1571: my $curRes = $dfsit->next();
1572: while ($depth > -1) {
1573: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1574: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1575:
1576: if (ref($curRes)) {
1577: # Parallel pre-processing: Do sequences have non-filtered-out children?
1578: if ($curRes->is_map()) {
1579: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1580: # Sequences themselves do not count as visible children,
1581: # unless those sequences also have visible children.
1582: # This means if a sequence appears, there's a "promise"
1583: # that there's something under it if you open it, somewhere.
1584: } else {
1585: # Not a sequence: if it's filtered, ignore it, otherwise
1586: # rise up the stack and mark the sequences as having children
1587: if (&$filterFunc($curRes)) {
1588: for my $sequence (@{$dfsit->getStack()}) {
1589: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1590: }
1591: }
1592: }
1593: }
1594: } continue {
1595: $curRes = $dfsit->next();
1596: }
1597: }
1598:
1599: my $displayedJumpMarker = 0;
1600: # Set up iteration.
1601: my $now = time();
1602: my $in24Hours = $now + 24 * 60 * 60;
1603: my $rownum = 0;
1604:
1605: # export "here" marker information
1606: $args->{'here'} = $here;
1607:
1608: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1609: my @resources;
1610: my $code='';# sub { !(shift->is_map();) };
1611: if ($args->{'sort'} eq 'title') {
1612: my $oldFilterFunc = $filterFunc;
1613: my $filterFunc=
1614: sub {
1615: my ($res)=@_;
1616: if ($res->is_map()) { return 0;}
1617: return &$oldFilterFunc($res);
1618: };
1619: @resources=$navmap->retrieveResources(undef,$filterFunc);
1620: @resources= sort { &cmp_title($a,$b) } @resources;
1621: } elsif ($args->{'sort'} eq 'duedate') {
1622: my $oldFilterFunc = $filterFunc;
1623: my $filterFunc=
1624: sub {
1625: my ($res)=@_;
1626: if (!$res->is_problem()) { return 0;}
1627: return &$oldFilterFunc($res);
1628: };
1629: @resources=$navmap->retrieveResources(undef,$filterFunc);
1630: @resources= sort {
1631: if ($a->duedate ne $b->duedate) {
1632: return $a->duedate cmp $b->duedate;
1633: }
1634: my $value=&cmp_title($a,$b);
1635: return $value;
1636: } @resources;
1637: } elsif ($args->{'sort'} eq 'discussion') {
1638: my $oldFilterFunc = $filterFunc;
1639: my $filterFunc=
1640: sub {
1641: my ($res)=@_;
1642: if (!$res->hasDiscussion() &&
1643: !$res->getFeedback() &&
1644: !$res->getErrors()) { return 0;}
1645: return &$oldFilterFunc($res);
1646: };
1647: @resources=$navmap->retrieveResources(undef,$filterFunc);
1648: @resources= sort { &cmp_title($a,$b) } @resources;
1649: } else {
1650: #unknow sort mechanism or default
1651: undef($args->{'sort'});
1652: }
1653:
1654:
1655: while (1) {
1656: if ($args->{'sort'}) {
1657: $curRes = shift(@resources);
1658: } else {
1659: $curRes = $it->next($closeAllPages);
1660:
1661: }
1662: if (!$curRes) { last; }
1663:
1664: # Maintain indentation level.
1665: if ($curRes == $it->BEGIN_MAP() ||
1666: $curRes == $it->BEGIN_BRANCH() ) {
1667: $args->{'indentLevel'}++;
1668: }
1669: if ($curRes == $it->END_MAP() ||
1670: $curRes == $it->END_BRANCH() ) {
1671: $args->{'indentLevel'}--;
1672: }
1673: # Notice new branches
1674: if ($curRes == $it->BEGIN_BRANCH()) {
1675: $args->{'isNewBranch'} = 1;
1676: }
1677:
1678: # If this isn't an actual resource, continue on
1679: if (!ref($curRes)) {
1680: next;
1681: }
1682:
1683: # If this has been filtered out, continue on
1684: if (!(&$filterFunc($curRes))) {
1685: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1686: next;
1687: }
1688:
1689: # If this is an empty sequence and we're filtering them, continue on
1690: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1691: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1692: next;
1693: }
1694:
1695: # If we're suppressing navmaps and this is a navmap, continue on
1696: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1697: next;
1698: }
1699:
1700: $args->{'counter'}++;
1701:
1702: # Does it have multiple parts?
1703: $args->{'multipart'} = 0;
1704: $args->{'condensed'} = 0;
1705: my @parts;
1706:
1707: # Decide what parts to show.
1708: if ($curRes->is_problem() && $showParts) {
1709: @parts = @{$curRes->parts()};
1710: $args->{'multipart'} = $curRes->multipart();
1711:
1712: if ($condenseParts) { # do the condensation
1713: if (!$args->{'condensed'}) {
1714: # Decide whether to condense based on similarity
1715: my $status = $curRes->status($parts[0]);
1716: my $due = $curRes->duedate($parts[0]);
1717: my $open = $curRes->opendate($parts[0]);
1718: my $statusAllSame = 1;
1719: my $dueAllSame = 1;
1720: my $openAllSame = 1;
1721: for (my $i = 1; $i < scalar(@parts); $i++) {
1722: if ($curRes->status($parts[$i]) != $status){
1723: $statusAllSame = 0;
1724: }
1725: if ($curRes->duedate($parts[$i]) != $due ) {
1726: $dueAllSame = 0;
1727: }
1728: if ($curRes->opendate($parts[$i]) != $open) {
1729: $openAllSame = 0;
1730: }
1731: }
1732: # $*allSame is true if all the statuses were
1733: # the same. Now, if they are all the same and
1734: # match one of the statuses to condense, or they
1735: # are all open with the same due date, or they are
1736: # all OPEN_LATER with the same open date, display the
1737: # status of the first non-zero part (to get the 'correct'
1738: # status right, since 0 is never 'correct' or 'open').
1739: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1740: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1741: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1742: @parts = ($parts[0]);
1743: $args->{'condensed'} = 1;
1744: }
1745: }
1746: # Multipart problem with one part: always "condense" (happens
1747: # to match the desirable behavior)
1748: if ($curRes->countParts() == 1) {
1749: @parts = ($parts[0]);
1750: $args->{'condensed'} = 1;
1751: }
1752: }
1753: }
1754:
1755: # If the multipart problem was condensed, "forget" it was multipart
1756: if (scalar(@parts) == 1) {
1757: $args->{'multipart'} = 0;
1758: } else {
1759: # Add part 0 so we display it correctly.
1760: unshift @parts, '0';
1761: }
1762:
1763: {
1764: my ($src,$symb,$anchor,$stack);
1765: if ($args->{'sort'}) {
1766: my $it = $navmap->getIterator(undef, undef, undef, 1);
1767: while ( my $res=$it->next()) {
1768: if (ref($res) &&
1769: $res->symb() eq $curRes->symb()) { last; }
1770: }
1771: $stack=$it->getStack();
1772: } else {
1773: $stack=$it->getStack();
1774: }
1775: ($src,$symb,$anchor)=getLinkForResource($stack);
1776: if (defined($anchor)) { $anchor='#'.$anchor; }
1777: my $srcHasQuestion = $src =~ /\?/;
1778: $args->{"resourceLink"} = $src.
1779: ($srcHasQuestion?'&':'?') .
1780: 'symb=' . &escape($symb).$anchor;
1781: }
1782: # Now, we've decided what parts to show. Loop through them and
1783: # show them.
1784: foreach my $part (@parts) {
1785: $rownum ++;
1786:
1787: $result .= &Apache::loncommon::start_data_table_row();
1788:
1789: # Set up some data about the parts that the cols might want
1790: my $filter = $it->{FILTER};
1791:
1792: # Now, display each column.
1793: foreach my $col (@$cols) {
1794: my $colHTML = '';
1795: if (ref($col)) {
1796: $colHTML .= &$col($curRes, $part, $args);
1797: } else {
1798: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1799: }
1800:
1801: # If this is the first column and it's time to print
1802: # the anchor, do so
1803: if ($col == $cols->[0] &&
1804: $args->{'counter'} == $args->{'currentJumpIndex'} -
1805: $currentJumpDelta) {
1806: # Jam the anchor after the <td> tag;
1807: # necessary for valid HTML (which Mozilla requires)
1808: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1809: $displayedJumpMarker = 1;
1810: }
1811: $result .= $colHTML . "\n";
1812: }
1813: $result .= &Apache::loncommon::end_data_table_row();
1814: $args->{'isNewBranch'} = 0;
1815: }
1816:
1817: if ($r && $rownum % 20 == 0) {
1818: $r->print($result);
1819: $result = "";
1820: $r->rflush();
1821: }
1822: } continue {
1823: if ($r) {
1824: # If we have the connection, make sure the user is still connected
1825: my $c = $r->connection;
1826: if ($c->aborted()) {
1827: # Who cares what we do, nobody will see it anyhow.
1828: return '';
1829: }
1830: }
1831: }
1832:
1833: # Print out the part that jumps to #curloc if it exists
1834: # delay needed because the browser is processing the jump before
1835: # it finishes rendering, so it goes to the wrong place!
1836: # onload might be better, but this routine has no access to that.
1837: # On mozilla, the 0-millisecond timeout seems to prevent this;
1838: # it's quite likely this might fix other browsers, too, and
1839: # certainly won't hurt anything.
1840: if ($displayedJumpMarker) {
1841: $result .= &Apache::lonhtmlcommon::scripttag("
1842: if (location.href.indexOf('#curloc')==-1) {
1843: setTimeout(\"location += '#curloc';\", 0)
1844: }
1845: ");
1846: }
1847:
1848: $result.=&Apache::loncommon::end_data_table();
1849:
1850: if ($r) {
1851: $r->print($result);
1852: $result = "";
1853: $r->rflush();
1854: }
1855:
1856: return $result;
1857: }
1858:
1859: sub add_linkitem {
1860: my ($linkitems,$name,$cmd,$text)=@_;
1861: $$linkitems{$name}{'cmd'}=$cmd;
1862: $$linkitems{$name}{'text'}=&mt($text);
1863: }
1864:
1865: sub show_linkitems_toolbar {
1866: my ($linkitems,$condition)=@_;
1867: my @linkorder = ('firsthomework','everything','uncompleted',
1868: 'changefolder','clearbubbles','edittoplevel');
1869: my $result .='<td align="left">'."\n".
1870: '<span class="LC_nobreak">'."\n".
1871: '<ul id="LC_toolbar">';
1872: foreach my $link (@linkorder) {
1873: my $link_id = 'LC_content_toolbar_'.$link;
1874: if (defined($linkitems->{$link})) {
1875: if ($linkitems->{$link}{'text'} ne '') {
1876: $linkitems->{$link}{'cmd'}=~s/"/'/g;
1877: if ($linkitems->{$link}{'cmd'}) {
1878: if ($link eq 'changefolder') {
1879: if ($condition) {
1880: $link_id='LC_content_toolbar_changefolder_toggled';
1881: } else {
1882: $link_id='LC_content_toolbar_changefolder';
1883: }
1884: }
1885: $result .= '<li><a href="#" '.
1886: 'onclick="'.$linkitems->{$link}{'cmd'}.'" '.
1887: 'id="'.$link_id.'" '.
1888: 'class="LC_toolbarItem" '.
1889: 'title="'.$linkitems->{$link}{'text'}.'">'.
1890: '</a></li>'."\n";
1891: }
1892: }
1893: }
1894: }
1895: $result .= '</ul>'.
1896: '</span></td>'."\n";
1897: return $result;
1898: }
1899:
1900:
1901: 1;
1902:
1903:
1904:
1905:
1906:
1907:
1908:
1909:
1910:
1911: package Apache::lonnavmaps::navmap;
1912:
1913: =pod
1914:
1915: =head1 Object: Apache::lonnavmaps::navmap
1916:
1917: =head2 Overview
1918:
1919: The navmap object's job is to provide access to the resources
1920: in the course as Apache::lonnavmaps::resource objects, and to
1921: query and manage the relationship between those resource objects.
1922:
1923: Generally, you'll use the navmap object in one of three basic ways.
1924: In order of increasing complexity and power:
1925:
1926: =over 4
1927:
1928: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1929: various ways to obtain resource objects, based on various identifiers.
1930: Use this when you want to request information about one object or
1931: a handful of resources you already know the identities of, from some
1932: other source. For more about Ids, Symbs, and MapPcs, see the
1933: Resource documentation. Note that Url should be a B<last resort>,
1934: not your first choice; it only really works when there is only one
1935: instance of the resource in the course, which only applies to
1936: maps, and even that may change in the future (see the B<getResourceByUrl>
1937: documentation for more details.)
1938:
1939: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1940: retrieves resources matching some criterion and returns them
1941: in a flat array, with no structure information. Use this when
1942: you are manipulating a series of resources, based on what map
1943: the are in, but do not care about branching, or exactly how
1944: the maps and resources are related. This is the most common case.
1945:
1946: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1947: the course's navmap in various ways without writing the traversal
1948: code yourself. See iterator documentation below. Use this when
1949: you need to know absolutely everything about the course, including
1950: branches and the precise relationship between maps and resources.
1951:
1952: =back
1953:
1954: =head2 Creation And Destruction
1955:
1956: To create a navmap object, use the following function:
1957:
1958: =over 4
1959:
1960: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1961:
1962: Creates a new navmap object. Returns the navmap object if this is
1963: successful, or B<undef> if not.
1964:
1965: =back
1966:
1967: =head2 Methods
1968:
1969: =over 4
1970:
1971: =item * B<getIterator>(first, finish, filter, condition):
1972:
1973: See iterator documentation below.
1974:
1975: =cut
1976:
1977: use strict;
1978: use GDBM_File;
1979: use Apache::lonnet;
1980: use LONCAPA;
1981:
1982: sub new {
1983: # magic invocation to create a class instance
1984: my $proto = shift;
1985: my $class = ref($proto) || $proto;
1986: my $self = {};
1987: bless($self); # So we can call change_user if neceesary
1988:
1989: $self->{USERNAME} = shift || $env{'user.name'};
1990: $self->{DOMAIN} = shift || $env{'user.domain'};
1991:
1992:
1993:
1994: # Resource cache stores navmap resources as we reference them. We generate
1995: # them on-demand so we don't pay for creating resources unless we use them.
1996: $self->{RESOURCE_CACHE} = {};
1997:
1998: # Network failure flag, if we accessed the course or user opt and
1999: # failed
2000: $self->{NETWORK_FAILURE} = 0;
2001:
2002: # We can only tie the nav hash as done below if the username/domain
2003: # match the env one. Otherwise change_user does everything we need...since we can't
2004: # assume there are course hashes for the specific requested user@domamin:
2005: #
2006:
2007: if ( ($self->{USERNAME} eq $env{'user.name'}) && ($self->{DOMAIN} eq $env{'user.domain'})) {
2008:
2009: # tie the nav hash
2010:
2011: my %navmaphash;
2012: my %parmhash;
2013: my $courseFn = $env{"request.course.fn"};
2014: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2015: &GDBM_READER(), 0640))) {
2016: return undef;
2017: }
2018:
2019: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2020: &GDBM_READER(), 0640)))
2021: {
2022: untie %{$self->{PARM_HASH}};
2023: return undef;
2024: }
2025:
2026: $self->{NAV_HASH} = \%navmaphash;
2027: $self->{PARM_HASH} = \%parmhash;
2028: $self->{PARM_CACHE} = {};
2029: } else {
2030: $self->change_user($self->{USERNAME}, $self->{DOMAIN});
2031: }
2032:
2033: my $d = Data::Dumper->new([$self]);
2034:
2035: return $self;
2036: }
2037:
2038: #
2039: # In some instances it is useful to be able to dynamically change the
2040: # username/domain associated with a navmap (e.g. to navigate for someone
2041: # else besides the current user...if sufficiently privileged.
2042: # Parameters:
2043: # user - New user.
2044: # domain- Domain the user belongs to.
2045: # Implicit inputs:
2046: #
2047: sub change_user {
2048: my $self = shift;
2049: $self->{USERNAME} = shift;
2050: $self->{DOMAIN} = shift;
2051:
2052: # If the hashes are already tied make sure to break that bond:
2053:
2054: untie %{$self->{NAV_HASH}};
2055: untie %{$self->{PARM_HASH}};
2056:
2057: # The assumption is that we have to
2058: # use lonmap here to re-read the hash and from it reconstruct
2059: # new big and parameter hashes. An implicit assumption at this time
2060: # is that the course file is probably not created locally yet
2061: # an that we will therefore just read without tying.
2062:
2063: my ($cdom, $cnum) = split(/\_/, $env{'request.course.id'});
2064:
2065: my %big_hash;
2066: &Apache::lonmap::loadmap($cnum, $cdom, $self->{USERNAME}, $self->{DOMAIN}, \%big_hash);
2067: $self->{NAV_HASH} = \%big_hash;
2068:
2069:
2070:
2071: # Now clear the parm cache and reconstruct the parm hash fromt he big_hash
2072: # param.xxxx keys.
2073:
2074: $self->{PARM_CACHE} = {};
2075:
2076: my %parm_hash = {};
2077: foreach my $key (keys %big_hash) {
2078: if ($key =~ /^param\./) {
2079: my $param_key = $key;
2080: $param_key =~ s/^param\.//;
2081: $parm_hash{$param_key} = $big_hash{$key};
2082: }
2083: }
2084:
2085: $self->{PARM_HASH} = \%parm_hash;
2086:
2087:
2088:
2089:
2090: }
2091:
2092: sub generate_course_user_opt {
2093: my $self = shift;
2094: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2095:
2096: my $uname=$self->{USERNAME};
2097: my $udom=$self->{DOMAIN};
2098:
2099: my $cid=$env{'request.course.id'};
2100: my $cdom=$env{'course.'.$cid.'.domain'};
2101: my $cnum=$env{'course.'.$cid.'.num'};
2102:
2103: # ------------------------------------------------- Get coursedata (if present)
2104: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2105: # Check for network failure
2106: if (!ref($courseopt)) {
2107: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2108: $self->{NETWORK_FAILURE} = 1;
2109: }
2110: undef($courseopt);
2111: }
2112:
2113: # --------------------------------------------------- Get userdata (if present)
2114:
2115: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2116: # Check for network failure
2117: if (!ref($useropt)) {
2118: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2119: $self->{NETWORK_FAILURE} = 1;
2120: }
2121: undef($useropt);
2122: }
2123:
2124: $self->{COURSE_OPT} = $courseopt;
2125: $self->{USER_OPT} = $useropt;
2126:
2127: $self->{COURSE_USER_OPT_GENERATED} = 1;
2128:
2129: return;
2130: }
2131:
2132: sub generate_email_discuss_status {
2133: my $self = shift;
2134: my $symb = shift;
2135: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2136:
2137: my $cid=$env{'request.course.id'};
2138: my $cdom=$env{'course.'.$cid.'.domain'};
2139: my $cnum=$env{'course.'.$cid.'.num'};
2140:
2141: my %emailstatus = &Apache::lonnet::dump('email_status',$self->{DOMAIN},$self->{USERNAME});
2142: my $logoutTime = $emailstatus{'logout'};
2143: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2144: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2145: $courseLeaveTime : $logoutTime);
2146: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2147: $cdom, $cnum);
2148: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2149: $self->{DOMAIN},$self->{USERNAME},'lastread');
2150: my %lastreadtime = ();
2151: foreach my $key (keys %lastread) {
2152: my $shortkey = $key;
2153: $shortkey =~ s/_lastread$//;
2154: $lastreadtime{$shortkey} = $lastread{$key};
2155: }
2156:
2157: my %feedback=();
2158: my %error=();
2159: my @keys = &Apache::lonnet::getkeys('nohist_email',$self->{DOMAIN},
2160: $self->{USERNAME});
2161:
2162: foreach my $msgid (@keys) {
2163: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2164: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
2165: $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
2166: &Apache::lonenc::check_decrypt(\$symb);
2167: if (($fromcid ne '') && ($fromcid ne $cid)) {
2168: next;
2169: }
2170: if (defined($symb)) {
2171: if (defined($error) && $error == 1) {
2172: $error{$symb}.=','.$msgid;
2173: } else {
2174: $feedback{$symb}.=','.$msgid;
2175: }
2176: } else {
2177: my $plain=
2178: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
2179: if ($plain=~/ \[([^\]]+)\]\:/) {
2180: my $url=$1;
2181: if ($plain=~/\:Error \[/) {
2182: $error{$url}.=','.$msgid;
2183: } else {
2184: $feedback{$url}.=','.$msgid;
2185: }
2186: }
2187: }
2188: }
2189: }
2190:
2191: #symbs of resources that have feedbacks (will be urls pre-2.3)
2192: $self->{FEEDBACK} = \%feedback;
2193: #or errors (will be urls pre 2.3)
2194: $self->{ERROR_MSG} = \%error;
2195: $self->{DISCUSSION_TIME} = \%discussiontime;
2196: $self->{EMAIL_STATUS} = \%emailstatus;
2197: $self->{LAST_READ} = \%lastreadtime;
2198:
2199: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2200: }
2201:
2202: sub get_user_data {
2203: my $self = shift;
2204: if ($self->{RETRIEVED_USER_DATA}) { return; }
2205:
2206: # Retrieve performance data on problems
2207: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2208: $self->{DOMAIN},
2209: $self->{USERNAME});
2210: $self->{STUDENT_DATA} = \%student_data;
2211:
2212: $self->{RETRIEVED_USER_DATA} = 1;
2213: }
2214:
2215: sub get_discussion_data {
2216: my $self = shift;
2217: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2218: return $self->{DISCUSSION_DATA};
2219: }
2220:
2221: $self->generate_email_discuss_status();
2222:
2223: my $cid=$env{'request.course.id'};
2224: my $cdom=$env{'course.'.$cid.'.domain'};
2225: my $cnum=$env{'course.'.$cid.'.num'};
2226: # Retrieve discussion data for resources in course
2227: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
2228:
2229:
2230: $self->{DISCUSSION_DATA} = \%discussion_data;
2231: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2232: return $self->{DISCUSSION_DATA};
2233: }
2234:
2235:
2236: # Internal function: Takes a key to look up in the nav hash and implements internal
2237: # memory caching of that key.
2238: sub navhash {
2239: my $self = shift; my $key = shift;
2240: return $self->{NAV_HASH}->{$key};
2241: }
2242:
2243: =pod
2244:
2245: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2246: false otherwise. Undefined course maps indicate an error somewhere in
2247: LON-CAPA, and you will not be able to proceed with using the navmap.
2248: See the B<NAV> screen for an example of using this.
2249:
2250: =cut
2251:
2252: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2253: sub courseMapDefined {
2254: my $self = shift;
2255: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2256:
2257: my $firstres = $self->navhash("map_start_$uri");
2258: my $lastres = $self->navhash("map_finish_$uri");
2259: return $firstres && $lastres;
2260: }
2261:
2262: sub getIterator {
2263: my $self = shift;
2264: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2265: shift, undef, shift,
2266: shift, shift);
2267: return $iterator;
2268: }
2269:
2270: # Private method: Does the given resource (as a symb string) have
2271: # current discussion? Returns 0 if chat/mail data not extracted.
2272: sub hasDiscussion {
2273: my $self = shift;
2274: my $symb = shift;
2275: $self->generate_email_discuss_status();
2276:
2277: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2278:
2279: #return defined($self->{DISCUSSION_TIME}->{$symb});
2280:
2281: # backward compatibility (bulletin boards used to be 'wrapped')
2282: my $ressymb = $self->wrap_symb($symb);
2283: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2284: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2285: } else {
2286: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2287: 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).
2288: }
2289: }
2290:
2291: sub last_post_time {
2292: my $self = shift;
2293: my $symb = shift;
2294: my $ressymb = $self->wrap_symb($symb);
2295: return $self->{DISCUSSION_TIME}->{$ressymb};
2296: }
2297:
2298: sub discussion_info {
2299: my $self = shift;
2300: my $symb = shift;
2301: my $filter = shift;
2302:
2303: $self->get_discussion_data();
2304:
2305: my $ressymb = $self->wrap_symb($symb);
2306: # keys used to store bulletinboard postings use 'unwrapped' symb.
2307: my $discsymb = &escape($self->unwrap_symb($ressymb));
2308: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2309: if (!$version) { return; }
2310:
2311: my $prevread = $self->{LAST_READ}{$ressymb};
2312:
2313: my $count = 0;
2314: my $hiddenflag = 0;
2315: my $deletedflag = 0;
2316: my ($hidden,$deleted,%info);
2317:
2318: for (my $id=$version; $id>0; $id--) {
2319: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2320: my @keys=split(/:/,$vkeys);
2321: if (grep(/^hidden$/ ,@keys)) {
2322: if (!$hiddenflag) {
2323: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2324: $hiddenflag = 1;
2325: }
2326: } elsif (grep(/^deleted$/,@keys)) {
2327: if (!$deletedflag) {
2328: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2329: $deletedflag = 1;
2330: }
2331: } else {
2332: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2333: if ($filter eq 'unread') {
2334: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2335: next;
2336: }
2337: }
2338: $count++;
2339: $info{$count}{'subject'} =
2340: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2341: $info{$count}{'id'} = $id;
2342: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2343: }
2344: }
2345: }
2346: if (wantarray) {
2347: return ($count,%info);
2348: }
2349: return $count;
2350: }
2351:
2352: sub wrap_symb {
2353: my $self = shift;
2354: my $symb = shift;
2355: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2356: unless ($symb =~ m|adm/wrapper/adm|) {
2357: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2358: }
2359: }
2360: return $symb;
2361: }
2362:
2363: sub unwrap_symb {
2364: my $self = shift;
2365: my $ressymb = shift;
2366: my $discsymb = $ressymb;
2367: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2368: $discsymb = $1.$2;
2369: }
2370: return $discsymb;
2371: }
2372:
2373: # Private method: Does the given resource (as a symb string) have
2374: # current feedback? Returns the string in the feedback hash, which
2375: # will be false if it does not exist.
2376:
2377: sub getFeedback {
2378: my $self = shift;
2379: my $symb = shift;
2380: my $source = shift;
2381:
2382: $self->generate_email_discuss_status();
2383:
2384: if (!defined($self->{FEEDBACK})) { return ""; }
2385:
2386: my $feedback;
2387: if ($self->{FEEDBACK}->{$symb}) {
2388: $feedback = $self->{FEEDBACK}->{$symb};
2389: if ($self->{FEEDBACK}->{$source}) {
2390: $feedback .= ','.$self->{FEEDBACK}->{$source};
2391: }
2392: } else {
2393: if ($self->{FEEDBACK}->{$source}) {
2394: $feedback = $self->{FEEDBACK}->{$source};
2395: }
2396: }
2397: return $feedback;
2398: }
2399:
2400: # Private method: Get the errors for that resource (by source).
2401: sub getErrors {
2402: my $self = shift;
2403: my $symb = shift;
2404: my $src = shift;
2405:
2406: $self->generate_email_discuss_status();
2407:
2408: if (!defined($self->{ERROR_MSG})) { return ""; }
2409:
2410: my $errors;
2411: if ($self->{ERROR_MSG}->{$symb}) {
2412: $errors = $self->{ERROR_MSG}->{$symb};
2413: if ($self->{ERROR_MSG}->{$src}) {
2414: $errors .= ','.$self->{ERROR_MSG}->{$src};
2415: }
2416: } else {
2417: if ($self->{ERROR_MSG}->{$src}) {
2418: $errors = $self->{ERROR_MSG}->{$src};
2419: }
2420: }
2421: return $errors;
2422: }
2423:
2424: =pod
2425:
2426: =item * B<getById>(id):
2427:
2428: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2429: object for that resource. This method, or other methods that use it
2430: (as in the resource object) is the only proper way to obtain a
2431: resource object.
2432:
2433: =item * B<getBySymb>(symb):
2434:
2435: Based on the symb of the resource, get a resource object for that
2436: resource. This is one of the proper ways to get a resource object.
2437:
2438: =item * B<getByMapPc>(map_pc):
2439:
2440: Based on the map_pc of the resource, get a resource object for
2441: the given map. This is one of the proper ways to get a resource object.
2442:
2443: =cut
2444:
2445: # The strategy here is to cache the resource objects, and only construct them
2446: # as we use them. The real point is to prevent reading any more from the tied
2447: # hash than we have to, which should hopefully alleviate speed problems.
2448:
2449: sub getById {
2450: my $self = shift;
2451: my $id = shift;
2452:
2453: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2454: {
2455: return $self->{RESOURCE_CACHE}->{$id};
2456: }
2457:
2458: # resource handles inserting itself into cache.
2459: # Not clear why the quotes are necessary, but as of this
2460: # writing it doesn't work without them.
2461: return "Apache::lonnavmaps::resource"->new($self, $id);
2462: }
2463:
2464: sub getBySymb {
2465: my $self = shift;
2466: my $symb = shift;
2467:
2468: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2469: my $map = $self->getResourceByUrl($mapUrl);
2470: my $returnvalue = undef;
2471: if (ref($map)) {
2472: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2473: }
2474: return $returnvalue;
2475: }
2476:
2477: sub getByMapPc {
2478: my $self = shift;
2479: my $map_pc = shift;
2480: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2481: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2482: return $self->getById($map_id);
2483: }
2484:
2485: =pod
2486:
2487: =item * B<firstResource>():
2488:
2489: Returns a resource object reference corresponding to the first
2490: resource in the navmap.
2491:
2492: =cut
2493:
2494: sub firstResource {
2495: my $self = shift;
2496: my $firstResource = $self->navhash('map_start_' .
2497: &Apache::lonnet::clutter($env{'request.course.uri'}));
2498: return $self->getById($firstResource);
2499: }
2500:
2501: =pod
2502:
2503: =item * B<finishResource>():
2504:
2505: Returns a resource object reference corresponding to the last resource
2506: in the navmap.
2507:
2508: =cut
2509:
2510: sub finishResource {
2511: my $self = shift;
2512: my $firstResource = $self->navhash('map_finish_' .
2513: &Apache::lonnet::clutter($env{'request.course.uri'}));
2514: return $self->getById($firstResource);
2515: }
2516:
2517: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2518: # the actual lookup; parmval caches the results.
2519: sub parmval {
2520: my $self = shift;
2521: my ($what,$symb,$recurse)=@_;
2522: my $hashkey = $what."|||".$symb;
2523: my $cache = $self->{PARM_CACHE};
2524: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2525: if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') {
2526: if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
2527: if (wantarray) {
2528: return @{$self->{PARM_CACHE}->{$hashkey}};
2529: } else {
2530: return $self->{PARM_CACHE}->{$hashkey}->[0];
2531: }
2532: }
2533: } else {
2534: return $self->{PARM_CACHE}->{$hashkey};
2535: }
2536: }
2537: my $result = $self->parmval_real($what, $symb, $recurse);
2538: $self->{PARM_CACHE}->{$hashkey} = $result;
2539: if (wantarray) {
2540: return @{$result};
2541: }
2542: return $result->[0];
2543: }
2544:
2545: sub parmval_real {
2546: my $self = shift;
2547: my ($what,$symb,$recurse) = @_;
2548:
2549: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2550: $self->generate_course_user_opt();
2551:
2552: my $cid=$env{'request.course.id'};
2553: my $csec=$env{'request.course.sec'};
2554: my $cgroup='';
2555: my @cgrps=split(/:/,$env{'request.course.groups'});
2556: if (@cgrps > 0) {
2557: @cgrps = sort(@cgrps);
2558: $cgroup = $cgrps[0];
2559: }
2560: my $uname=$self->{USERNAME};
2561: my $udom=$self->{DOMAIN};
2562:
2563: unless ($symb) { return ['']; }
2564: my $result='';
2565:
2566: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2567: $mapname = &Apache::lonnet::deversion($mapname);
2568: # ----------------------------------------------------- Cascading lookup scheme
2569: my $rwhat=$what;
2570: $what=~s/^parameter\_//;
2571: $what=~s/\_/\./;
2572:
2573: my $symbparm=$symb.'.'.$what;
2574: my $mapparm=$mapname.'___(all).'.$what;
2575: my $usercourseprefix=$cid;
2576:
2577: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2578: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2579: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2580:
2581: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2582: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2583: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2584:
2585: my $courselevel= $usercourseprefix.'.'.$what;
2586: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2587: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2588:
2589: my $useropt = $self->{USER_OPT};
2590: my $courseopt = $self->{COURSE_OPT};
2591: my $parmhash = $self->{PARM_HASH};
2592:
2593: # ---------------------------------------------------------- first, check user
2594: if ($uname and defined($useropt)) {
2595: if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
2596: if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
2597: if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
2598: }
2599:
2600: # ------------------------------------------------------- second, check course
2601: if ($cgroup ne '' and defined($courseopt)) {
2602: if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
2603: if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
2604: if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
2605: }
2606:
2607: if ($csec and defined($courseopt)) {
2608: if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
2609: if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
2610: if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
2611: }
2612:
2613: if (defined($courseopt)) {
2614: if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
2615: }
2616:
2617: # ----------------------------------------------------- third, check map parms
2618:
2619: my $thisparm=$$parmhash{$symbparm};
2620: if (defined($thisparm)) { return [$thisparm,'map']; }
2621:
2622: # ----------------------------------------------------- fourth , check default
2623:
2624: my $meta_rwhat=$rwhat;
2625: $meta_rwhat=~s/\./_/g;
2626: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2627: if (defined($default)) { return [$default,'resource']}
2628: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2629: if (defined($default)) { return [$default,'resource']}
2630: # --------------------------------------------------- fifth, check more course
2631: if (defined($courseopt)) {
2632: if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
2633: if (defined($$courseopt{$courselevel})) {
2634: my $ret = [$$courseopt{$courselevel},'course'];
2635: return $ret;
2636: }
2637: }
2638: # --------------------------------------------------- sixth , cascade up parts
2639:
2640: my ($space,@qualifier)=split(/\./,$rwhat);
2641: my $qualifier=join('.',@qualifier);
2642: unless ($space eq '0') {
2643: my @parts=split(/_/,$space);
2644: my $id=pop(@parts);
2645: my $part=join('_',@parts);
2646: if ($part eq '') { $part='0'; }
2647: my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2648: if (defined($partgeneral[0])) { return \@partgeneral; }
2649: }
2650: if ($recurse) { return []; }
2651: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2652: if (defined($pack_def)) { return [$pack_def,'resource']; }
2653: return [''];
2654: }
2655:
2656: =pod
2657:
2658: =item * B<getResourceByUrl>(url,multiple):
2659:
2660: Retrieves a resource object by URL of the resource, unless the optional
2661: multiple parameter is included in which case an array of resource
2662: objects is returned. If passed a resource object, it will simply return
2663: it, so it is safe to use this method in code like
2664: "$res = $navmap->getResourceByUrl($res)"
2665: if you're not sure if $res is already an object, or just a URL. If the
2666: resource appears multiple times in the course, only the first instance
2667: will be returned (useful for maps), unless the multiple parameter has
2668: been included, in which case all instances are returned in an array.
2669:
2670: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2671:
2672: The map is a specification of a map to retreive the resources from,
2673: either as a url or as an object. The filterFunc is a reference to a
2674: function that takes a resource object as its one argument and returns
2675: true if the resource should be included, or false if it should not
2676: be. If recursive is true, the map will be recursively examined,
2677: otherwise it will not be. If bailout is true, the function will return
2678: as soon as it finds a resource, if false it will finish. If showall is
2679: true it will not hide maps that contain nothing but one other map. By
2680: default, the map is the top-level map of the course, filterFunc is a
2681: function that always returns 1, recursive is true, bailout is false,
2682: showall is false. The resources will be returned in a list containing
2683: the resource objects for the corresponding resources, with B<no
2684: structure information> in the list; regardless of branching,
2685: recursion, etc., it will be a flat list.
2686:
2687: Thus, this is suitable for cases where you don't want the structure,
2688: just a list of all resources. It is also suitable for finding out how
2689: many resources match a given description; for this use, if all you
2690: want to know is if I<any> resources match the description, the bailout
2691: parameter will allow you to avoid potentially expensive enumeration of
2692: all matching resources.
2693:
2694: =item * B<hasResource>(map, filterFunc, recursive, showall):
2695:
2696: Convenience method for
2697:
2698: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2699:
2700: which will tell whether the map has resources matching the description
2701: in the filter function.
2702:
2703: =item * B<usedVersion>(url):
2704:
2705: Retrieves version infomation for a url. Returns the version (a number, or
2706: the string "mostrecent") for resources which have version information in
2707: the big hash.
2708:
2709: =cut
2710:
2711:
2712: sub getResourceByUrl {
2713: my $self = shift;
2714: my $resUrl = shift;
2715: my $multiple = shift;
2716:
2717: if (ref($resUrl)) { return $resUrl; }
2718:
2719: $resUrl = &Apache::lonnet::clutter($resUrl);
2720: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2721: if (!$resId) { return ''; }
2722: if ($multiple) {
2723: my @resources = ();
2724: my @resIds = split (/,/, $resId);
2725: foreach my $id (@resIds) {
2726: my $resourceId = $self->getById($id);
2727: if ($resourceId) {
2728: push(@resources,$resourceId);
2729: }
2730: }
2731: return @resources;
2732: } else {
2733: if ($resId =~ /,/) {
2734: $resId = (split (/,/, $resId))[0];
2735: }
2736: return $self->getById($resId);
2737: }
2738: }
2739:
2740: sub retrieveResources {
2741: my $self = shift;
2742: my $map = shift;
2743: my $filterFunc = shift;
2744: if (!defined ($filterFunc)) {
2745: $filterFunc = sub {return 1;};
2746: }
2747: my $recursive = shift;
2748: if (!defined($recursive)) { $recursive = 1; }
2749: my $bailout = shift;
2750: if (!defined($bailout)) { $bailout = 0; }
2751: my $showall = shift;
2752: # Create the necessary iterator.
2753: if (!ref($map)) { # assume it's a url of a map.
2754: $map = $self->getResourceByUrl($map);
2755: }
2756:
2757: # If nothing was passed, assume top-level map
2758: if (!$map) {
2759: $map = $self->getById('0.0');
2760: }
2761:
2762: # Check the map's validity.
2763: if (!$map->is_map()) {
2764: # Oh, to throw an exception.... how I'd love that!
2765: return ();
2766: }
2767:
2768: # Get an iterator.
2769: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2770: undef, $recursive, $showall);
2771:
2772: my @resources = ();
2773:
2774: if (&$filterFunc($map)) {
2775: push(@resources, $map);
2776: }
2777:
2778: # Run down the iterator and collect the resources.
2779: my $curRes;
2780:
2781: while ($curRes = $it->next()) {
2782: if (ref($curRes)) {
2783: if (!&$filterFunc($curRes)) {
2784: next;
2785: }
2786:
2787: push(@resources, $curRes);
2788:
2789: if ($bailout) {
2790: return @resources;
2791: }
2792: }
2793:
2794: }
2795:
2796: return @resources;
2797: }
2798:
2799: sub hasResource {
2800: my $self = shift;
2801: my $map = shift;
2802: my $filterFunc = shift;
2803: my $recursive = shift;
2804: my $showall = shift;
2805:
2806: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2807: }
2808:
2809: sub usedVersion {
2810: my $self = shift;
2811: my $linkurl = shift;
2812: return $self->navhash("version_$linkurl");
2813: }
2814:
2815: 1;
2816:
2817: package Apache::lonnavmaps::iterator;
2818: use Scalar::Util qw(weaken);
2819: use Apache::lonnet;
2820:
2821: =pod
2822:
2823: =back
2824:
2825: =head1 Object: navmap Iterator
2826:
2827: An I<iterator> encapsulates the logic required to traverse a data
2828: structure. navmap uses an iterator to traverse the course map
2829: according to the criteria you wish to use.
2830:
2831: To obtain an iterator, call the B<getIterator>() function of a
2832: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2833: directly.) This will return a reference to the iterator:
2834:
2835: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2836:
2837: To get the next thing from the iterator, call B<next>:
2838:
2839: C<my $nextThing = $resourceIterator-E<gt>next()>
2840:
2841: getIterator behaves as follows:
2842:
2843: =over 4
2844:
2845: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2846:
2847: All parameters are optional. firstResource is a resource reference
2848: corresponding to where the iterator should start. It defaults to
2849: navmap->firstResource() for the corresponding nav map. finishResource
2850: corresponds to where you want the iterator to end, defaulting to
2851: navmap->finishResource(). filterHash is a hash used as a set
2852: containing strings representing the resource IDs, defaulting to
2853: empty. Condition is a 1 or 0 that sets what to do with the filter
2854: hash: If a 0, then only resources that exist IN the filterHash will be
2855: recursed on. If it is a 1, only resources NOT in the filterHash will
2856: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2857: false (default), the iterator will only return the first level of map
2858: that is not just a single, 'redirecting' map. If true, the iterator
2859: will return all information, starting with the top-level map,
2860: regardless of content. returnTopMap, if true (default false), will
2861: cause the iterator to return the top-level map object (resource 0.0)
2862: before anything else.
2863:
2864: Thus, by default, only top-level resources will be shown. Change the
2865: condition to a 1 without changing the hash, and all resources will be
2866: shown. Changing the condition to 1 and including some values in the
2867: hash will allow you to selectively suppress parts of the navmap, while
2868: leaving it on 0 and adding things to the hash will allow you to
2869: selectively add parts of the nav map. See the handler code for
2870: examples.
2871:
2872: The iterator will return either a reference to a resource object, or a
2873: token representing something in the map, such as the beginning of a
2874: new branch. The possible tokens are:
2875:
2876: =over 4
2877:
2878: =item * B<END_ITERATOR>:
2879:
2880: The iterator has returned all that it's going to. Further calls to the
2881: iterator will just produce more of these. This is a "false" value, and
2882: is the only false value the iterator which will be returned, so it can
2883: be used as a loop sentinel.
2884:
2885: =item * B<BEGIN_MAP>:
2886:
2887: A new map is being recursed into. This is returned I<after> the map
2888: resource itself is returned.
2889:
2890: =item * B<END_MAP>:
2891:
2892: The map is now done.
2893:
2894: =item * B<BEGIN_BRANCH>:
2895:
2896: A branch is now starting. The next resource returned will be the first
2897: in that branch.
2898:
2899: =item * B<END_BRANCH>:
2900:
2901: The branch is now done.
2902:
2903: =back
2904:
2905: The tokens are retreivable via methods on the iterator object, i.e.,
2906: $iterator->END_MAP.
2907:
2908: Maps can contain empty resources. The iterator will automatically skip
2909: over such resources, but will still treat the structure
2910: correctly. Thus, a complicated map with several branches, but
2911: consisting entirely of empty resources except for one beginning or
2912: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2913: but only one resource will be returned.
2914:
2915: =back
2916:
2917: =head2 Normal Usage
2918:
2919: Normal usage of the iterator object is to do the following:
2920:
2921: my $it = $navmap->getIterator([your params here]);
2922: my $curRes;
2923: while ($curRes = $it->next()) {
2924: [your logic here]
2925: }
2926:
2927: Note that inside of the loop, it's frequently useful to check if
2928: "$curRes" is a reference or not with the reference function; only
2929: resource objects will be references, and any non-references will
2930: be the tokens described above.
2931:
2932: Also note there is some old code floating around that trys to track
2933: the depth of the iterator to see when it's done; do not copy that
2934: code. It is difficult to get right and harder to understand than
2935: this. They should be migrated to this new style.
2936:
2937: =cut
2938:
2939: # Here are the tokens for the iterator:
2940:
2941: sub END_ITERATOR { return 0; }
2942: sub BEGIN_MAP { return 1; } # begining of a new map
2943: sub END_MAP { return 2; } # end of the map
2944: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2945: sub END_BRANCH { return 4; } # end of a branch
2946: sub FORWARD { return 1; } # go forward
2947: sub BACKWARD { return 2; }
2948:
2949: sub min {
2950: (my $a, my $b) = @_;
2951: if ($a < $b) { return $a; } else { return $b; }
2952: }
2953:
2954: sub new {
2955: # magic invocation to create a class instance
2956: my $proto = shift;
2957: my $class = ref($proto) || $proto;
2958: my $self = {};
2959:
2960: weaken($self->{NAV_MAP} = shift);
2961: return undef unless ($self->{NAV_MAP});
2962:
2963: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
2964: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
2965:
2966: # Handle the parameters
2967: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2968: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2969:
2970: # If the given resources are just the ID of the resource, get the
2971: # objects
2972: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2973: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2974: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2975: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2976:
2977: $self->{FILTER} = shift;
2978:
2979: # A hash, used as a set, of resource already seen
2980: $self->{ALREADY_SEEN} = shift;
2981: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2982: $self->{CONDITION} = shift;
2983:
2984: # Do we want to automatically follow "redirection" maps?
2985: $self->{FORCE_TOP} = shift;
2986:
2987: # Do we want to return the top-level map object (resource 0.0)?
2988: $self->{RETURN_0} = shift;
2989: # have we done that yet?
2990: $self->{HAVE_RETURNED_0} = 0;
2991:
2992: # Now, we need to pre-process the map, by walking forward and backward
2993: # over the parts of the map we're going to look at.
2994:
2995: # The processing steps are exactly the same, except for a few small
2996: # changes, so I bundle those up in the following list of two elements:
2997: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2998: # first_resource).
2999: # This prevents writing nearly-identical code twice.
3000: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
3001: 'FIRST_RESOURCE'],
3002: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
3003: 'FINISH_RESOURCE'] );
3004:
3005: my $maxDepth = 0; # tracks max depth
3006:
3007: # If there is only one resource in this map, and it's a map, we
3008: # want to remember that, so the user can ask for the first map
3009: # that isn't just a redirector.
3010: my $resource; my $resourceCount = 0;
3011:
3012: # Documentation on this algorithm can be found in the CVS repository at
3013: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
3014: # in that file.
3015: # **1**
3016:
3017: foreach my $pass (@iterations) {
3018: my $direction = $pass->[0];
3019: my $valName = $pass->[1];
3020: my $nextResourceMethod = $pass->[2];
3021: my $firstResourceName = $pass->[3];
3022:
3023: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
3024: $self->{FIRST_RESOURCE},
3025: $self->{FINISH_RESOURCE},
3026: {}, undef, 0, $direction);
3027:
3028: # prime the recursion
3029: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
3030: $iterator->next();
3031: my $curRes = $iterator->next();
3032: my $depth = 1;
3033: while ($depth > 0) {
3034: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
3035: if ($curRes == $iterator->END_MAP()) { $depth--; }
3036:
3037: if (ref($curRes)) {
3038: # If there's only one resource, this will save it
3039: # we have to filter empty resources from consideration here,
3040: # or even "empty", redirecting maps have two (start & finish)
3041: # or three (start, finish, plus redirector)
3042: if($direction == FORWARD && $curRes->src()) {
3043: $resource = $curRes; $resourceCount++;
3044: }
3045: my $resultingVal = $curRes->{DATA}->{$valName};
3046: my $nextResources = $curRes->$nextResourceMethod();
3047: my $nextCount = scalar(@{$nextResources});
3048:
3049: if ($nextCount == 1) { # **3**
3050: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
3051: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
3052: }
3053:
3054: if ($nextCount > 1) { # **4**
3055: foreach my $res (@{$nextResources}) {
3056: my $current = $res->{DATA}->{$valName} || 999999999;
3057: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
3058: }
3059: }
3060: }
3061:
3062: # Assign the final val (**2**)
3063: if (ref($curRes) && $direction == BACKWARD()) {
3064: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
3065: $curRes->{DATA}->{BOT_UP_VAL});
3066:
3067: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
3068: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
3069: }
3070:
3071: $curRes = $iterator->next();
3072: }
3073: }
3074:
3075: # Check: Was this only one resource, a map?
3076: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
3077: my $firstResource = $resource->map_start();
3078: my $finishResource = $resource->map_finish();
3079: my $result;
3080: my $rdump = Data::Dumper->new([$result]);
3081: $result = Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3082: $finishResource, $self->{FILTER},
3083: $self->{ALREADY_SEEN},
3084: $self->{CONDITION},
3085: $self->{FORCE_TOP});
3086: return $result;
3087:
3088:
3089: }
3090:
3091: # Set up some bookkeeping information.
3092: $self->{CURRENT_DEPTH} = 0;
3093: $self->{MAX_DEPTH} = $maxDepth;
3094: $self->{STACK} = [];
3095: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3096: $self->{FINISHED} = 0; # When true, the iterator has finished
3097:
3098: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
3099: push @{$self->{STACK}}, [];
3100: }
3101:
3102: # Prime the recursion w/ the first resource **5**
3103: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3104: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3105:
3106: bless ($self);
3107: my $selfDump = Data::Dumper->new([$self]);
3108:
3109: return $self;
3110: }
3111:
3112: sub next {
3113: my $self = shift;
3114: my $closeAllPages=shift;
3115: if ($self->{FINISHED}) {
3116: return END_ITERATOR();
3117: }
3118:
3119: # If we want to return the top-level map object, and haven't yet,
3120: # do so.
3121: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3122: $self->{HAVE_RETURNED_0} = 1;
3123: my $nextTopLevel = $self->{NAV_MAP}->getById('0.0');
3124:
3125: return $self->{NAV_MAP}->getById('0.0');
3126: }
3127: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
3128: $self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
3129: return $self->BEGIN_MAP();
3130: }
3131:
3132: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3133: # grab the next from the recursive iterator
3134: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3135:
3136: # is it a begin or end map? If so, update the depth
3137: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3138: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3139:
3140: # Are we back at depth 0? If so, stop recursing
3141: if ($self->{RECURSIVE_DEPTH} == 0) {
3142: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3143: }
3144: return $next;
3145: }
3146:
3147: if (defined($self->{FORCE_NEXT})) {
3148: my $tmp = $self->{FORCE_NEXT};
3149: $self->{FORCE_NEXT} = undef;
3150:
3151: return $tmp;
3152: }
3153:
3154: # Have we not yet begun? If not, return BEGIN_MAP and
3155: # remember we've started.
3156: if ( !$self->{STARTED} ) {
3157: $self->{STARTED} = 1;
3158: return $self->BEGIN_MAP();
3159: }
3160:
3161: # Here's the guts of the iterator.
3162:
3163: # Find the next resource, if any.
3164: my $found = 0;
3165: my $i = $self->{MAX_DEPTH};
3166: my $newDepth;
3167: my $here;
3168: while ( $i >= 0 && !$found ) {
3169: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3170: $here = pop @{$self->{STACK}->[$i]}; # **7**
3171: $found = 1;
3172: $newDepth = $i;
3173: }
3174: $i--;
3175: }
3176:
3177: # If we still didn't find anything, we're done.
3178: if ( !$found ) {
3179: # We need to get back down to the correct branch depth
3180: if ( $self->{CURRENT_DEPTH} > 0 ) {
3181: $self->{CURRENT_DEPTH}--;
3182: return END_BRANCH();
3183: } else {
3184: $self->{FINISHED} = 1;
3185: return END_MAP();
3186: }
3187: }
3188:
3189: # If this is not a resource, it must be an END_BRANCH marker we want
3190: # to return directly.
3191: if (!ref($here)) { # **8**
3192: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3193: $self->{CURRENT_DEPTH}--;
3194: return $here;
3195: }
3196: }
3197:
3198: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3199: $self->{HERE} = $here;
3200:
3201: # Get to the right level
3202: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3203: push @{$self->{STACK}->[$newDepth]}, $here;
3204: $self->{CURRENT_DEPTH}--;
3205: return END_BRANCH();
3206: }
3207: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3208: push @{$self->{STACK}->[$newDepth]}, $here;
3209: $self->{CURRENT_DEPTH}++;
3210: return BEGIN_BRANCH();
3211: }
3212:
3213: # If we made it here, we have the next resource, and we're at the
3214: # right branch level. So let's examine the resource for where
3215: # we can get to from here.
3216:
3217: # So we need to look at all the resources we can get to from here,
3218: # categorize them if we haven't seen them, remember if we have a new
3219: my $nextUnfiltered = $here->getNext();
3220:
3221:
3222: my $maxDepthAdded = -1;
3223:
3224: for (@$nextUnfiltered) {
3225: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3226: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3227: push @{$self->{STACK}->[$depth]}, $_;
3228: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3229: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3230: }
3231: }
3232:
3233: # Is this the end of a branch? If so, all of the resources examined above
3234: # led to lower levels than the one we are currently at, so we push a END_BRANCH
3235: # marker onto the stack so we don't forget.
3236: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3237: # BC branch and gets to C, it will see F as the only next resource, but it's
3238: # one level lower. Thus, this is the end of the branch, since there are no
3239: # more resources added to this level or above.
3240: # We don't do this if the examined resource is the finish resource,
3241: # because the condition given above is true, but the "END_MAP" will
3242: # take care of things and we should already be at depth 0.
3243: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3244: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3245: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3246: }
3247:
3248: # That ends the main iterator logic. Now, do we want to recurse
3249: # down this map (if this resource is a map)?
3250: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3251: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3252: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3253: my $firstResource = $self->{HERE}->map_start();
3254: my $finishResource = $self->{HERE}->map_finish();
3255: $self->{RECURSIVE_ITERATOR} =
3256: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3257: $finishResource, $self->{FILTER},
3258: $self->{ALREADY_SEEN},
3259: $self->{CONDITION},
3260: $self->{FORCE_TOP});
3261: }
3262:
3263: # If this is a blank resource, don't actually return it.
3264: # Should you ever find you need it, make sure to add an option to the code
3265: # that you can use; other things depend on this behavior.
3266: my $browsePriv = $self->{HERE}->browsePriv();
3267: if (!$self->{HERE}->src() ||
3268: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3269: return $self->next($closeAllPages);
3270: }
3271:
3272: my $hereResource = $self->{HERE};
3273:
3274: return $self->{HERE};
3275:
3276: }
3277:
3278: =pod
3279:
3280: The other method available on the iterator is B<getStack>, which
3281: returns an array populated with the current 'stack' of maps, as
3282: references to the resource objects. Example: This is useful when
3283: making the navigation map, as we need to check whether we are under a
3284: page map to see if we need to link directly to the resource, or to the
3285: page. The first elements in the array will correspond to the top of
3286: the stack (most inclusive map).
3287:
3288: =cut
3289:
3290: sub getStack {
3291: my $self=shift;
3292:
3293: my @stack;
3294:
3295: $self->populateStack(\@stack);
3296:
3297: return \@stack;
3298: }
3299:
3300: # Private method: Calls the iterators recursively to populate the stack.
3301: sub populateStack {
3302: my $self=shift;
3303: my $stack = shift;
3304:
3305: push @$stack, $self->{HERE} if ($self->{HERE});
3306:
3307: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3308: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3309: }
3310: }
3311:
3312: 1;
3313:
3314: package Apache::lonnavmaps::DFSiterator;
3315: use Scalar::Util qw(weaken);
3316: use Apache::lonnet;
3317:
3318: # Not documented in the perldoc: This is a simple iterator that just walks
3319: # through the nav map and presents the resources in a depth-first search
3320: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3321: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3322: # useful for pre-processing of some kind, and is in fact used by the main
3323: # iterator that way, but that's about it.
3324: # One could imagine merging this into the init routine of the main iterator,
3325: # but this might as well be left separate, since it is possible some other
3326: # use might be found for it. - Jeremy
3327:
3328: # Unlike the main iterator, this DOES return all resources, even blank ones.
3329: # The main iterator needs them to correctly preprocess the map.
3330:
3331: sub BEGIN_MAP { return 1; } # begining of a new map
3332: sub END_MAP { return 2; } # end of the map
3333: sub FORWARD { return 1; } # go forward
3334: sub BACKWARD { return 2; }
3335:
3336: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3337: # filter hash ref (or undef), already seen hash or undef, condition
3338: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3339: sub new {
3340: # magic invocation to create a class instance
3341: my $proto = shift;
3342: my $class = ref($proto) || $proto;
3343: my $self = {};
3344:
3345: weaken($self->{NAV_MAP} = shift);
3346: return undef unless ($self->{NAV_MAP});
3347:
3348: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3349: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3350:
3351: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3352: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3353:
3354: # If the given resources are just the ID of the resource, get the
3355: # objects
3356: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3357: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3358: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3359: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3360:
3361: $self->{FILTER} = shift;
3362:
3363: # A hash, used as a set, of resource already seen
3364: $self->{ALREADY_SEEN} = shift;
3365: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3366: $self->{CONDITION} = shift;
3367: $self->{DIRECTION} = shift || FORWARD();
3368:
3369: # Flag: Have we started yet?
3370: $self->{STARTED} = 0;
3371:
3372: # Should we continue calling the recursive iterator, if any?
3373: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3374: # The recursive iterator, if any
3375: $self->{RECURSIVE_ITERATOR} = undef;
3376: # Are we recursing on a map, or a branch?
3377: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3378: # And the count of how deep it is, so that this iterator can keep track of
3379: # when to pick back up again.
3380: $self->{RECURSIVE_DEPTH} = 0;
3381:
3382: # For keeping track of our branches, we maintain our own stack
3383: $self->{STACK} = [];
3384:
3385: # Start with the first resource
3386: if ($self->{DIRECTION} == FORWARD) {
3387: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3388: } else {
3389: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3390: }
3391:
3392: bless($self);
3393: return $self;
3394: }
3395:
3396: sub next {
3397: my $self = shift;
3398:
3399: # Are we using a recursive iterator? If so, pull from that and
3400: # watch the depth; we want to resume our level at the correct time.
3401: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3402: # grab the next from the recursive iterator
3403: my $next = $self->{RECURSIVE_ITERATOR}->next();
3404:
3405: # is it a begin or end map? Update depth if so
3406: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3407: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3408:
3409: # Are we back at depth 0? If so, stop recursing.
3410: if ($self->{RECURSIVE_DEPTH} == 0) {
3411: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3412: }
3413:
3414: return $next;
3415: }
3416:
3417: # Is there a current resource to grab? If not, then return
3418: # END_MAP, which will end the iterator.
3419: if (scalar(@{$self->{STACK}}) == 0) {
3420: return $self->END_MAP();
3421: }
3422:
3423: # Have we not yet begun? If not, return BEGIN_MAP and
3424: # remember that we've started.
3425: if ( !$self->{STARTED} ) {
3426: $self->{STARTED} = 1;
3427: return $self->BEGIN_MAP;
3428: }
3429:
3430: # Get the next resource in the branch
3431: $self->{HERE} = pop @{$self->{STACK}};
3432:
3433: # remember that we've seen this, so we don't return it again later
3434: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3435:
3436: # Get the next possible resources
3437: my $nextUnfiltered;
3438: if ($self->{DIRECTION} == FORWARD()) {
3439: $nextUnfiltered = $self->{HERE}->getNext();
3440:
3441: } else {
3442: $nextUnfiltered = $self->{HERE}->getPrevious();
3443: }
3444: my $next = [];
3445:
3446: # filter the next possibilities to remove things we've
3447: # already seen.
3448: foreach my $item (@$nextUnfiltered) {
3449: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3450: push @$next, $item;
3451: }
3452: }
3453:
3454: while (@$next) {
3455: # copy the next possibilities over to the stack
3456: push @{$self->{STACK}}, shift @$next;
3457: }
3458:
3459: # If this is a map and we want to recurse down it... (not filtered out)
3460: if ($self->{HERE}->is_map() &&
3461: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3462: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3463: my $firstResource = $self->{HERE}->map_start();
3464: my $finishResource = $self->{HERE}->map_finish();
3465:
3466: $self->{RECURSIVE_ITERATOR} =
3467: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3468: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3469: $self->{CONDITION}, $self->{DIRECTION});
3470: }
3471:
3472: return $self->{HERE};
3473: }
3474:
3475: # Identical to the full iterator methods of the same name. Hate to copy/paste
3476: # but I also hate to "inherit" either iterator from the other.
3477:
3478: sub getStack {
3479: my $self=shift;
3480:
3481: my @stack;
3482:
3483: $self->populateStack(\@stack);
3484:
3485: return \@stack;
3486: }
3487:
3488: # Private method: Calls the iterators recursively to populate the stack.
3489: sub populateStack {
3490: my $self=shift;
3491: my $stack = shift;
3492:
3493: push @$stack, $self->{HERE} if ($self->{HERE});
3494:
3495: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3496: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3497: }
3498: }
3499:
3500: 1;
3501:
3502: package Apache::lonnavmaps::resource;
3503: use Scalar::Util qw(weaken);
3504: use Apache::lonnet;
3505:
3506: =pod
3507:
3508: =head1 Object: resource
3509:
3510: X<resource, navmap object>
3511: A resource object encapsulates a resource in a resource map, allowing
3512: easy manipulation of the resource, querying the properties of the
3513: resource (including user properties), and represents a reference that
3514: can be used as the canonical representation of the resource by
3515: lonnavmap clients like renderers.
3516:
3517: A resource only makes sense in the context of a navmap, as some of the
3518: data is stored in the navmap object.
3519:
3520: You will probably never need to instantiate this object directly. Use
3521: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3522: starting resource.
3523:
3524: Resource objects respect the parameter_hiddenparts, which suppresses
3525: various parts according to the wishes of the map author. As of this
3526: writing, there is no way to override this parameter, and suppressed
3527: parts will never be returned, nor will their response types or ids be
3528: stored.
3529:
3530: =head2 Overview
3531:
3532: A B<Resource> is the most granular type of object in LON-CAPA that can
3533: be included in a course. It can either be a particular resource, like
3534: an HTML page, external resource, problem, etc., or it can be a
3535: container sequence, such as a "page" or a "map".
3536:
3537: To see a sequence from the user's point of view, please see the
3538: B<Creating a Course: Maps and Sequences> chapter of the Author's
3539: Manual.
3540:
3541: A Resource Object, once obtained from a navmap object via a B<getBy*>
3542: method of the navmap, or from an iterator, allows you to query
3543: information about that resource.
3544:
3545: Generally, you do not ever want to create a resource object yourself,
3546: so creation has been left undocumented. Always retrieve resources
3547: from navmap objects.
3548:
3549: =head3 Identifying Resources
3550:
3551: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3552: unique to that resource for a given course. X<resource ID, in big hash>
3553: The Resource ID has the form #.#, where the first number is the same
3554: for every resource in a map, and the second is unique. For instance,
3555: for a course laid out like this:
3556:
3557: * Problem 1
3558: * Map
3559: * Resource 2
3560: * Resource 3
3561:
3562: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3563: C<Resource 3> will share a first number. The second number may end up
3564: re-used between the two groups.
3565:
3566: The resource ID is only used in the big hash, but can be used in the
3567: context of a course to identify a resource easily. (For instance, the
3568: printing system uses it to record which resources from a sequence you
3569: wish to print.)
3570:
3571: X<symb> X<resource, symb>
3572: All resources also have B<symb>s, which uniquely identify a resource
3573: in a course. Many internal LON-CAPA functions expect a symb. A symb
3574: carries along with it the URL of the resource, and the map it appears
3575: in. Symbs are much larger than resource IDs.
3576:
3577: =cut
3578:
3579: sub new {
3580: # magic invocation to create a class instance
3581: my $proto = shift;
3582: my $class = ref($proto) || $proto;
3583: my $self = {};
3584:
3585: weaken($self->{NAV_MAP} = shift);
3586: $self->{ID} = shift;
3587:
3588: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3589: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3590:
3591: # Store this new resource in the parent nav map's cache.
3592: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3593: $self->{RESOURCE_ERROR} = 0;
3594:
3595: # A hash that can be used by two-pass algorithms to store data
3596: # about this resource in. Not used by the resource object
3597: # directly.
3598: $self->{DATA} = {};
3599:
3600: bless($self);
3601:
3602: return $self;
3603: }
3604:
3605: # private function: simplify the NAV_HASH lookups we keep doing
3606: # pass the name, and to automatically append my ID, pass a true val on the
3607: # second param
3608: sub navHash {
3609: my $self = shift;
3610: my $param = shift;
3611: my $id = shift;
3612: my $arg = $param . ($id?$self->{ID}:"");
3613: if (ref($self) && ref($self->{NAV_MAP}) && defined($arg)) {
3614: return $self->{NAV_MAP}->navhash($arg);
3615: }
3616: return;
3617: }
3618:
3619: =pod
3620:
3621: =head2 Methods
3622:
3623: Once you have a resource object, here's what you can do with it:
3624:
3625: =head3 Attribute Retrieval
3626:
3627: Every resource has certain attributes that can be retrieved and used:
3628:
3629: =over 4
3630:
3631: =item * B<ID>: Every resource has an ID that is unique for that
3632: resource in the course it is in. The ID is actually in the hash
3633: representing the resource, so for a resource object $res, obtain
3634: it via C<$res->{ID}).
3635:
3636: =item * B<compTitle>:
3637:
3638: Returns a "composite title", that is equal to $res->title() if the
3639: resource has a title, and is otherwise the last part of the URL (e.g.,
3640: "problem.problem").
3641:
3642: =item * B<ext>:
3643:
3644: Returns true if the resource is external.
3645:
3646: =item * B<kind>:
3647:
3648: Returns the kind of the resource from the compiled nav map.
3649:
3650: =item * B<randomout>:
3651:
3652: Returns true if this resource was chosen to NOT be shown to the user
3653: by the random map selection feature. In other words, this is usually
3654: false.
3655:
3656: =item * B<randompick>:
3657:
3658: Returns the number of randomly picked items for a map if the randompick
3659: feature is being used on the map.
3660:
3661: =item * B<randomorder>:
3662:
3663: Returns true for a map if the randomorder feature is being used on the
3664: map.
3665:
3666: =item * B<src>:
3667:
3668: Returns the source for the resource.
3669:
3670: =item * B<symb>:
3671:
3672: Returns the symb for the resource.
3673:
3674: =item * B<title>:
3675:
3676: Returns the title of the resource.
3677:
3678: =back
3679:
3680: =cut
3681:
3682: # These info functions can be used directly, as they don't return
3683: # resource information.
3684: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3685: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3686: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3687: sub from { my $self=shift; return $self->navHash("from_", 1); }
3688: # considered private and undocumented
3689: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3690: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3691: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3692: sub randompick {
3693: my $self = shift;
3694: my $randompick = $self->parmval('randompick');
3695: return $randompick;
3696: }
3697: sub randomorder {
3698: my $self = shift;
3699: my $randomorder = $self->parmval('randomorder');
3700: return ($randomorder =~ /^yes$/i);
3701: }
3702: sub link {
3703: my $self=shift;
3704: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3705: return $self->src;
3706: }
3707: sub src {
3708: my $self=shift;
3709: return $self->navHash("src_", 1);
3710: }
3711: sub shown_symb {
3712: my $self=shift;
3713: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3714: return $self->symb();
3715: }
3716: sub id {
3717: my $self=shift;
3718: return $self->{ID};
3719: }
3720: sub enclosing_map_src {
3721: my $self=shift;
3722: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3723: return $self->navHash('map_id_'.$first);
3724: }
3725: sub symb {
3726: my $self=shift;
3727: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3728: my $symbSrc = &Apache::lonnet::declutter($self->src());
3729: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3730: . '___' . $second . '___' . $symbSrc;
3731: return &Apache::lonnet::symbclean($symb);
3732: }
3733: sub wrap_symb {
3734: my $self = shift;
3735: return $self->{NAV_MAP}->wrap_symb($self->symb());
3736: }
3737: sub title {
3738: my $self=shift;
3739: if ($self->{ID} eq '0.0') {
3740: # If this is the top-level map, return the title of the course
3741: # since this map can not be titled otherwise.
3742: return $env{'course.'.$env{'request.course.id'}.'.description'};
3743: }
3744: return $self->navHash("title_", 1); }
3745: # considered private and undocumented
3746: sub to { my $self=shift; return $self->navHash("to_", 1); }
3747: sub condition {
3748: my $self=shift;
3749: my $undercond=$self->navHash("undercond_", 1);
3750: if (!defined($undercond)) { return 1; };
3751: my $condid=$self->navHash("condid_$undercond");
3752: if (!defined($condid)) { return 1; };
3753: my $condition=&Apache::lonnet::directcondval($condid);
3754: return $condition;
3755: }
3756: sub condval {
3757: my $self=shift;
3758: my ($pathname,$filename) =
3759: &Apache::lonnet::split_uri_for_cond($self->src());
3760:
3761: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3762: /\&\Q$filename\E\:([\d\|]+)\&/);
3763: if ($match) {
3764: return &Apache::lonnet::condval($1);
3765: }
3766: return 0;
3767: }
3768: sub compTitle {
3769: my $self = shift;
3770: my $title = $self->title();
3771: $title=~s/\&colon\;/\:/gs;
3772: if (!$title) {
3773: $title = $self->src();
3774: $title = substr($title, rindex($title, '/') + 1);
3775: }
3776: return $title;
3777: }
3778:
3779: =pod
3780:
3781: B<Predicate Testing the Resource>
3782:
3783: These methods are shortcuts to deciding if a given resource has a given property.
3784:
3785: =over 4
3786:
3787: =item * B<is_map>:
3788:
3789: Returns true if the resource is a map type.
3790:
3791: =item * B<is_problem>:
3792:
3793: Returns true if the resource is a problem type, false
3794: otherwise. (Looks at the extension on the src field; might need more
3795: to work correctly.)
3796:
3797: =item * B<is_page>:
3798:
3799: Returns true if the resource is a page.
3800:
3801: =item * B<is_sequence>:
3802:
3803: Returns true if the resource is a sequence.
3804:
3805: =back
3806:
3807: =cut
3808:
3809: sub hasResource {
3810: my $self = shift;
3811: return $self->{NAV_MAP}->hasResource(@_);
3812: }
3813:
3814: sub retrieveResources {
3815: my $self = shift;
3816: return $self->{NAV_MAP}->retrieveResources(@_);
3817: }
3818:
3819: sub is_exam {
3820: my ($self,$part) = @_;
3821: my $type = $self->parmval('type',$part);
3822: if ($type eq 'exam') {
3823: return 1;
3824: }
3825: if ($self->src() =~ /\.(exam)$/) {
3826: return 1;
3827: }
3828: return 0;
3829: }
3830: sub is_html {
3831: my $self=shift;
3832: my $src = $self->src();
3833: return ($src =~ /html$/);
3834: }
3835: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3836: sub is_page {
3837: my $self=shift;
3838: my $src = $self->src();
3839: return $self->navHash("is_map_", 1) &&
3840: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3841: }
3842: sub is_practice {
3843: my $self=shift;
3844: my ($part) = @_;
3845: my $type = $self->parmval('type',$part);
3846: if ($type eq 'practice') {
3847: return 1;
3848: }
3849: return 0;
3850: }
3851: sub is_problem {
3852: my $self=shift;
3853: my $src = $self->src();
3854: if ($src =~ /$LONCAPA::assess_re/) {
3855: return !($self->is_practice());
3856: }
3857: return 0;
3858: }
3859: #
3860: # The has below is the set of status that are considered 'incomplete'
3861: #
3862: my %incomplete_hash =
3863: (
3864: TRIES_LEFT() => 1,
3865: OPEN() => 1,
3866: ATTEMPTED() => 1
3867:
3868: );
3869: #
3870: # Return tru if a problem is incomplete... for now incomplete means that
3871: # any part of the problem is incomplete.
3872: # Note that if the resources is not a problem, 0 is returned.
3873: #
3874: sub is_incomplete {
3875: my $self = shift;
3876: if ($self->is_problem()) {
3877: foreach my $part (@{$self->parts()}) {
3878: if (exists($incomplete_hash{$self->status($part)})) {
3879: return 1;
3880: }
3881: }
3882: }
3883: return 0;
3884:
3885: }
3886: sub is_raw_problem {
3887: my $self=shift;
3888: my $src = $self->src();
3889: if ($src =~ /$LONCAPA::assess_re/) {
3890: return 1;
3891: }
3892: return 0;
3893: }
3894:
3895: sub contains_problem {
3896: my $self=shift;
3897: if ($self->is_page()) {
3898: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3899: return $hasProblem;
3900: }
3901: return 0;
3902: }
3903: sub map_contains_problem {
3904: my $self=shift;
3905: if ($self->is_map()) {
3906: my $has_problem=
3907: $self->hasResource($self,sub { $_[0]->is_problem() },1);
3908: return $has_problem;
3909: }
3910: return 0;
3911: }
3912: sub is_sequence {
3913: my $self=shift;
3914: return $self->navHash("is_map_", 1) &&
3915: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3916: }
3917: sub is_survey {
3918: my $self = shift();
3919: my $part = shift();
3920: my $type = $self->parmval('type',$part);
3921: if (($type eq 'survey') || ($type eq 'surveycred')) {
3922: return 1;
3923: }
3924: if ($self->src() =~ /\.(survey)$/) {
3925: return 1;
3926: }
3927: return 0;
3928: }
3929: sub is_anonsurvey {
3930: my $self = shift();
3931: my $part = shift();
3932: my $type = $self->parmval('type',$part);
3933: if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
3934: return 1;
3935: }
3936: return 0;
3937: }
3938: sub is_task {
3939: my $self=shift;
3940: my $src = $self->src();
3941: return ($src =~ /\.(task)$/)
3942: }
3943:
3944: sub is_empty_sequence {
3945: my $self=shift;
3946: my $src = $self->src();
3947: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3948: }
3949:
3950: # Private method: Shells out to the parmval in the nav map, handler parts.
3951: sub parmval {
3952: my $self = shift;
3953: my $what = shift;
3954: my $part = shift;
3955: if (!defined($part)) {
3956: $part = '0';
3957: }
3958: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3959: }
3960:
3961: =pod
3962:
3963: B<Map Methods>
3964:
3965: These methods are useful for getting information about the map
3966: properties of the resource, if the resource is a map (B<is_map>).
3967:
3968: =over 4
3969:
3970: =item * B<map_finish>:
3971:
3972: Returns a reference to a resource object corresponding to the finish
3973: resource of the map.
3974:
3975: =item * B<map_pc>:
3976:
3977: Returns the pc value of the map, which is the first number that
3978: appears in the resource ID of the resources in the map, and is the
3979: number that appears around the middle of the symbs of the resources in
3980: that map.
3981:
3982: =item * B<map_start>:
3983:
3984: Returns a reference to a resource object corresponding to the start
3985: resource of the map.
3986:
3987: =item * B<map_type>:
3988:
3989: Returns a string with the type of the map in it.
3990:
3991: =item *B<map_hierarchy>:
3992:
3993: Returns a string with a comma-separated ordered list of map_pc IDs
3994: for the hierarchy of maps containing a map, with the top level
3995: map first, then descending to deeper levels, with the enclosing map last.
3996:
3997: =back
3998:
3999: =cut
4000:
4001: sub map_finish {
4002: my $self = shift;
4003: my $src = $self->src();
4004: $src = &Apache::lonnet::clutter($src);
4005: my $res = $self->navHash("map_finish_$src", 0);
4006: $res = $self->{NAV_MAP}->getById($res);
4007: return $res;
4008: }
4009: sub map_pc {
4010: my $self = shift;
4011: my $src = $self->src();
4012: return $self->navHash("map_pc_$src", 0);
4013: }
4014: sub map_start {
4015: my $self = shift;
4016: my $src = $self->src();
4017: $src = &Apache::lonnet::clutter($src);
4018: my $res = $self->navHash("map_start_$src", 0);
4019: $res = $self->{NAV_MAP}->getById($res);
4020: return $res;
4021: }
4022: sub map_type {
4023: my $self = shift;
4024: my $pc = $self->map_pc();
4025: return $self->navHash("map_type_$pc", 0);
4026: }
4027: sub map_hierarchy {
4028: my $self = shift;
4029: my $pc = $self->map_pc();
4030: return $self->navHash("map_hierarchy_$pc", 0);
4031: }
4032:
4033: #####
4034: # Property queries
4035: #####
4036:
4037: # These functions will be responsible for returning the CORRECT
4038: # VALUE for the parameter, no matter what. So while they may look
4039: # like direct calls to parmval, they can be more than that.
4040: # So, for instance, the duedate function should use the "duedatetype"
4041: # information, rather than the resource object user.
4042:
4043: =pod
4044:
4045: =head2 Resource Parameters
4046:
4047: In order to use the resource parameters correctly, the nav map must
4048: have been instantiated with genCourseAndUserOptions set to true, so
4049: the courseopt and useropt is read correctly. Then, you can call these
4050: functions to get the relevant parameters for the resource. Each
4051: function defaults to part "0", but can be directed to another part by
4052: passing the part as the parameter.
4053:
4054: These methods are responsible for getting the parameter correct, not
4055: merely reflecting the contents of the GDBM hashes. As we move towards
4056: dates relative to other dates, these methods should be updated to
4057: reflect that. (Then, anybody using these methods will not have to update
4058: their code.)
4059:
4060: =over 4
4061:
4062: =item * B<printable>
4063:
4064: returns true if the current date is such that the
4065: specified resource part is printable.
4066:
4067: =item * B<resprintable>
4068:
4069: Returns true if all parts in the resource are printable making the
4070: entire resource printable.
4071:
4072: =item * B<acc>
4073:
4074: Get the Client IP/Name Access Control information.
4075:
4076: =item * B<answerdate>:
4077:
4078: Get the answer-reveal date for the problem.
4079:
4080: =item * B<awarded>:
4081:
4082: Gets the awarded value for the problem part. Requires genUserData set to
4083: true when the navmap object was created.
4084:
4085: =item * B<duedate>:
4086:
4087: Get the due date for the problem.
4088:
4089: =item * B<tries>:
4090:
4091: Get the number of tries the student has used on the problem.
4092:
4093: =item * B<maxtries>:
4094:
4095: Get the number of max tries allowed.
4096:
4097: =item * B<opendate>:
4098:
4099: Get the open date for the problem.
4100:
4101: =item * B<sig>:
4102:
4103: Get the significant figures setting.
4104:
4105: =item * B<tol>:
4106:
4107: Get the tolerance for the problem.
4108:
4109: =item * B<tries>:
4110:
4111: Get the number of tries the user has already used on the problem.
4112:
4113: =item * B<type>:
4114:
4115: Get the question type for the problem.
4116:
4117: =item * B<weight>:
4118:
4119: Get the weight for the problem.
4120:
4121: =back
4122:
4123: =cut
4124:
4125: sub printable {
4126:
4127: my ($self, $part) = @_;
4128:
4129: # Get the print open/close dates for the resource.
4130:
4131: my $start = $self->parmval("prinstartdate", $part);
4132: my $end = $self->parmval("printenddate", $part);
4133:
4134: # The following cases apply:
4135: # - No dates set: Printable.
4136: # - Start date set but no end date: Printable if now >= start date.
4137: # - End date set but no start date: Printable if now <= end date.
4138: # - both defined: printable if start <= now <= end
4139: #
4140: my $now = time();
4141:
4142: my $startok = 1;
4143: my $endok = 1;
4144:
4145: if ((defined $start) && ($start ne '')) {
4146: $startok = $start <= $now;
4147: }
4148: if ((defined $end) && ($end != '')) {
4149: $endok = $end >= $now;
4150: }
4151: return $startok && $endok;
4152: }
4153:
4154: sub resprintable {
4155: my $self = shift;
4156:
4157: # get parts...or realize there are no parts.
4158:
4159: my $partsref = $self->parts();
4160: my @parts = @$partsref;
4161:
4162: if ((!defined(@parts)) || (scalar(@parts) == 0)) {
4163: return $self->printable(0);
4164: } else {
4165: foreach my $part (@parts) {
4166: if (!$self->printable($part)) {
4167: return 0;
4168: }
4169: }
4170: return 1;
4171: }
4172: }
4173:
4174: sub acc {
4175: (my $self, my $part) = @_;
4176: my $acc = $self->parmval("acc", $part);
4177: return $acc;
4178: }
4179: sub answerdate {
4180: (my $self, my $part) = @_;
4181: # Handle intervals
4182: my $answerdatetype = $self->parmval("answerdate.type", $part);
4183: my $answerdate = $self->parmval("answerdate", $part);
4184: my $duedate = $self->parmval("duedate", $part);
4185: if ($answerdatetype eq 'date_interval') {
4186: $answerdate = $duedate + $answerdate;
4187: }
4188: return $answerdate;
4189: }
4190: sub awarded {
4191: my $self = shift; my $part = shift;
4192: $self->{NAV_MAP}->get_user_data();
4193: if (!defined($part)) { $part = '0'; }
4194: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
4195: }
4196: sub taskversion {
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.'.version'};
4201: }
4202: sub taskstatus {
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.'.$self->taskversion($part).'.'.$part.'.status'};
4207: }
4208: sub solved {
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.'.$part.'.solved'};
4213: }
4214: sub checkedin {
4215: my $self = shift; my $part = shift;
4216: $self->{NAV_MAP}->get_user_data();
4217: if (!defined($part)) { $part = '0'; }
4218: if ($self->is_task()) {
4219: my $version = $self->taskversion($part);
4220: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
4221: } else {
4222: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin.slot'});
4223: }
4224: }
4225: # this should work exactly like the copy in lonhomework.pm
4226: # Why is there a copy in lonhomework? Why not centralized?
4227: #
4228: # TODO: Centralize duedate.
4229: #
4230:
4231: sub duedate {
4232: (my $self, my $part) = @_;
4233: my $date;
4234: my @interval=$self->parmval("interval", $part);
4235: my $due_date=$self->parmval("duedate", $part);
4236: if ($interval[0] =~ /\d+/) {
4237: my $first_access=&Apache::lonnet::get_first_access($interval[1],
4238: $self->symb);
4239: if (defined($first_access)) {
4240: my $interval = $first_access+$interval[0];
4241: $date = (!$due_date || $interval < $due_date) ? $interval
4242: : $due_date;
4243: } else {
4244: $date = $due_date;
4245: }
4246: } else {
4247: $date = $due_date;
4248: }
4249: return $date;
4250: }
4251: sub handgrade {
4252: (my $self, my $part) = @_;
4253: my @response_ids = $self->responseIds($part);
4254: if (@response_ids) {
4255: foreach my $response_id (@response_ids) {
4256: my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
4257: if (lc($handgrade) eq 'yes') {
4258: return 'yes';
4259: }
4260: }
4261: }
4262: my $handgrade = $self->parmval("handgrade", $part);
4263: return $handgrade;
4264: }
4265: sub maxtries {
4266: (my $self, my $part) = @_;
4267: my $maxtries = $self->parmval("maxtries", $part);
4268: return $maxtries;
4269: }
4270: sub opendate {
4271: (my $self, my $part) = @_;
4272: my $opendatetype = $self->parmval("opendate.type", $part);
4273: my $opendate = $self->parmval("opendate", $part);
4274: if ($opendatetype eq 'date_interval') {
4275: my $duedate = $self->duedate($part);
4276: $opendate = $duedate - $opendate;
4277: }
4278: return $opendate;
4279: }
4280: sub problemstatus {
4281: (my $self, my $part) = @_;
4282: my $problemstatus = $self->parmval("problemstatus", $part);
4283: return lc($problemstatus);
4284: }
4285: sub sig {
4286: (my $self, my $part) = @_;
4287: my $sig = $self->parmval("sig", $part);
4288: return $sig;
4289: }
4290: sub tol {
4291: (my $self, my $part) = @_;
4292: my $tol = $self->parmval("tol", $part);
4293: return $tol;
4294: }
4295: sub tries {
4296: my $self = shift;
4297: my $tries = $self->queryRestoreHash('tries', shift);
4298: if (!defined($tries)) { return '0';}
4299: return $tries;
4300: }
4301: sub type {
4302: (my $self, my $part) = @_;
4303: my $type = $self->parmval("type", $part);
4304: return $type;
4305: }
4306: sub weight {
4307: my $self = shift; my $part = shift;
4308: if (!defined($part)) { $part = '0'; }
4309: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
4310: $self->symb(), $self->{DOMAIN},
4311: $self->{USERNAME},
4312: $env{'request.course.sec'});
4313: return $weight;
4314: }
4315: sub part_display {
4316: my $self= shift(); my $partID = shift();
4317: if (! defined($partID)) { $partID = '0'; }
4318: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
4319: $self->symb);
4320: if (! defined($display) || $display eq '') {
4321: $display = $partID;
4322: }
4323: return $display;
4324: }
4325: sub slot_control {
4326: my $self=shift(); my $part = shift();
4327: if (!defined($part)) { $part = '0'; }
4328: my $useslots = $self->parmval("useslots", $part);
4329: my $availablestudent = $self->parmval("availablestudent", $part);
4330: my $available = $self->parmval("available", $part);
4331: return ($useslots,$availablestudent,$available);
4332: }
4333:
4334: # Multiple things need this
4335: sub getReturnHash {
4336: my $self = shift;
4337:
4338: if (!defined($self->{RETURN_HASH})) {
4339: my %tmpHash = &Apache::lonnet::restore($self->symb(),undef,$self->{DOMAIN},$self->{USERNAME});
4340: $self->{RETURN_HASH} = \%tmpHash;
4341: }
4342: }
4343:
4344: ######
4345: # Status queries
4346: ######
4347:
4348: # These methods query the status of problems.
4349:
4350: # If we need to count parts, this function determines the number of
4351: # parts from the metadata. When called, it returns a reference to a list
4352: # of strings corresponding to the parts. (Thus, using it in a scalar context
4353: # tells you how many parts you have in the problem:
4354: # $partcount = scalar($resource->countParts());
4355: # Don't use $self->{PARTS} directly because you don't know if it's been
4356: # computed yet.
4357:
4358: =pod
4359:
4360: =head2 Resource misc
4361:
4362: Misc. functions for the resource.
4363:
4364: =over 4
4365:
4366: =item * B<hasDiscussion>:
4367:
4368: Returns a false value if there has been discussion since the user last
4369: logged in, true if there has. Always returns false if the discussion
4370: data was not extracted when the nav map was constructed.
4371:
4372: =item * B<last_post_time>:
4373:
4374: Returns a false value if there hasn't been discussion otherwise returns
4375: unix timestamp of last time a discussion posting (or edit) was made.
4376:
4377: =item * B<discussion_info>:
4378:
4379: optional argument is a filter (currently can be 'unread');
4380: returns in scalar context the count of the number of discussion postings.
4381:
4382: returns in list context both the count of postings and a hash ref
4383: containing information about the postings (subject, id, timestamp) in a hash.
4384:
4385: 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.
4386:
4387: =item * B<getFeedback>:
4388:
4389: Gets the feedback for the resource and returns the raw feedback string
4390: for the resource, or the null string if there is no feedback or the
4391: email data was not extracted when the nav map was constructed. Usually
4392: used like this:
4393:
4394: for my $url (split(/\,/, $res->getFeedback())) {
4395: my $link = &escape($url);
4396: ...
4397:
4398: and use the link as appropriate.
4399:
4400: =cut
4401:
4402: sub hasDiscussion {
4403: my $self = shift;
4404: return $self->{NAV_MAP}->hasDiscussion($self->symb());
4405: }
4406:
4407: sub last_post_time {
4408: my $self = shift;
4409: return $self->{NAV_MAP}->last_post_time($self->symb());
4410: }
4411:
4412: sub discussion_info {
4413: my ($self,$filter) = @_;
4414: return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
4415: }
4416:
4417: sub getFeedback {
4418: my $self = shift;
4419: my $source = $self->src();
4420: my $symb = $self->symb();
4421: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4422: return $self->{NAV_MAP}->getFeedback($symb,$source);
4423: }
4424:
4425: sub getErrors {
4426: my $self = shift;
4427: my $source = $self->src();
4428: my $symb = $self->symb();
4429: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4430: return $self->{NAV_MAP}->getErrors($symb,$source);
4431: }
4432:
4433: =pod
4434:
4435: =item * B<parts>():
4436:
4437: Returns a list reference containing sorted strings corresponding to
4438: each part of the problem. Single part problems have only a part '0'.
4439: Multipart problems do not return their part '0', since they typically
4440: do not really matter.
4441:
4442: =item * B<countParts>():
4443:
4444: Returns the number of parts of the problem a student can answer. Thus,
4445: for single part problems, returns 1. For multipart, it returns the
4446: number of parts in the problem, not including psuedo-part 0.
4447:
4448: =item * B<countResponses>():
4449:
4450: Returns the total number of responses in the problem a student can answer.
4451:
4452: =item * B<responseTypes>():
4453:
4454: Returns a hash whose keys are the response types. The values are the number
4455: of times each response type is used. This is for the I<entire> problem, not
4456: just a single part.
4457:
4458: =item * B<multipart>():
4459:
4460: Returns true if the problem is multipart, false otherwise. Use this instead
4461: of countParts if all you want is multipart/not multipart.
4462:
4463: =item * B<responseType>($part):
4464:
4465: Returns the response type of the part, without the word "response" on the
4466: end. Example return values: 'string', 'essay', 'numeric', etc.
4467:
4468: =item * B<responseIds>($part):
4469:
4470: Retreives the response IDs for the given part as an array reference containing
4471: strings naming the response IDs. This may be empty.
4472:
4473: =back
4474:
4475: =cut
4476:
4477: sub parts {
4478: my $self = shift;
4479:
4480: if ($self->ext) { return []; }
4481:
4482: $self->extractParts();
4483: return $self->{PARTS};
4484: }
4485:
4486: sub countParts {
4487: my $self = shift;
4488:
4489: my $parts = $self->parts();
4490:
4491: # If I left this here, then it's not necessary.
4492: #my $delta = 0;
4493: #for my $part (@$parts) {
4494: # if ($part eq '0') { $delta--; }
4495: #}
4496:
4497: if ($self->{RESOURCE_ERROR}) {
4498: return 0;
4499: }
4500:
4501: return scalar(@{$parts}); # + $delta;
4502: }
4503:
4504: sub countResponses {
4505: my $self = shift;
4506: my $count;
4507: foreach my $part (@{$self->parts()}) {
4508: $count+= scalar($self->responseIds($part));
4509: }
4510: return $count;
4511: }
4512:
4513: sub responseTypes {
4514: my $self = shift;
4515: my %responses;
4516: foreach my $part (@{$self->parts()}) {
4517: foreach my $responsetype ($self->responseType($part)) {
4518: $responses{$responsetype}++ if (defined($responsetype));
4519: }
4520: }
4521: return %responses;
4522: }
4523:
4524: sub multipart {
4525: my $self = shift;
4526: return $self->countParts() > 1;
4527: }
4528:
4529: sub singlepart {
4530: my $self = shift;
4531: return $self->countParts() == 1;
4532: }
4533:
4534: sub responseType {
4535: my $self = shift;
4536: my $part = shift;
4537:
4538: $self->extractParts();
4539: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4540: return @{$self->{RESPONSE_TYPES}->{$part}};
4541: } else {
4542: return undef;
4543: }
4544: }
4545:
4546: sub responseIds {
4547: my $self = shift;
4548: my $part = shift;
4549:
4550: $self->extractParts();
4551: if (defined($self->{RESPONSE_IDS}->{$part})) {
4552: return @{$self->{RESPONSE_IDS}->{$part}};
4553: } else {
4554: return undef;
4555: }
4556: }
4557:
4558: # Private function: Extracts the parts information, both part names and
4559: # part types, and saves it.
4560: sub extractParts {
4561: my $self = shift;
4562:
4563: return if (defined($self->{PARTS}));
4564: return if ($self->ext);
4565:
4566: $self->{PARTS} = [];
4567:
4568: my %parts;
4569:
4570: # Retrieve part count, if this is a problem
4571: if ($self->is_problem()) {
4572: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4573: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4574:
4575: if ($partorder) {
4576: my @parts;
4577: for my $part (split (/,/,$partorder)) {
4578: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4579: push @parts, $part;
4580: $parts{$part} = 1;
4581: }
4582: }
4583: $self->{PARTS} = \@parts;
4584: } else {
4585: if (!$metadata) {
4586: $self->{RESOURCE_ERROR} = 1;
4587: $self->{PARTS} = [];
4588: $self->{PART_TYPE} = {};
4589: return;
4590: }
4591: foreach my $entry (split(/\,/,$metadata)) {
4592: if ($entry =~ /^(?:part|Task)_(.*)$/) {
4593: my $part = $1;
4594: # This floods the logs if it blows up
4595: if (defined($parts{$part})) {
4596: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4597: }
4598:
4599: # check to see if part is turned off.
4600:
4601: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4602: $parts{$part} = 1;
4603: }
4604: }
4605: }
4606: my @sortedParts = sort keys %parts;
4607: $self->{PARTS} = \@sortedParts;
4608: }
4609:
4610:
4611: # These hashes probably do not need names that end with "Hash"....
4612: my %responseIdHash;
4613: my %responseTypeHash;
4614:
4615:
4616: # Init the responseIdHash
4617: foreach my $part (@{$self->{PARTS}}) {
4618: $responseIdHash{$part} = [];
4619: }
4620:
4621: # Now, the unfortunate thing about this is that parts, part name, and
4622: # response id are delimited by underscores, but both the part
4623: # name and response id can themselves have underscores in them.
4624: # So we have to use our knowlege of part names to figure out
4625: # where the part names begin and end, and even then, it is possible
4626: # to construct ambiguous situations.
4627: foreach my $data (split /,/, $metadata) {
4628: if ($data =~ /^([a-zA-Z]+)response_(.*)/
4629: || $data =~ /^(Task)_(.*)/) {
4630: my $responseType = $1;
4631: my $partStuff = $2;
4632: my $partIdSoFar = '';
4633: my @partChunks = split /_/, $partStuff;
4634: my $i = 0;
4635: for ($i = 0; $i < scalar(@partChunks); $i++) {
4636: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4637: $partIdSoFar .= $partChunks[$i];
4638: if ($parts{$partIdSoFar}) {
4639: my @otherChunks = @partChunks[$i+1..$#partChunks];
4640: my $responseId = join('_', @otherChunks);
4641: if ($self->is_task()) {
4642: push(@{$responseIdHash{$partIdSoFar}},
4643: $partIdSoFar);
4644: } else {
4645: push(@{$responseIdHash{$partIdSoFar}},
4646: $responseId);
4647: }
4648: push(@{$responseTypeHash{$partIdSoFar}},
4649: $responseType);
4650: }
4651: }
4652: }
4653: }
4654: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4655: #
4656: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4657: if ($resorder) {
4658: my @resorder=split(/,/,$resorder);
4659: foreach my $part (keys(%responseIdHash)) {
4660: my $i=0;
4661: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4662: my @neworder;
4663: foreach my $possibleid (@resorder) {
4664: if (exists($resids{$possibleid})) {
4665: push(@neworder,$resids{$possibleid});
4666: }
4667: }
4668: my @ids;
4669: my @type;
4670: foreach my $element (@neworder) {
4671: push (@ids,$responseIdHash{$part}->[$element]);
4672: push (@type,$responseTypeHash{$part}->[$element]);
4673: }
4674: $responseIdHash{$part}=\@ids;
4675: $responseTypeHash{$part}=\@type;
4676: }
4677: }
4678: $self->{RESPONSE_IDS} = \%responseIdHash;
4679: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4680: }
4681:
4682: return;
4683: }
4684:
4685: =pod
4686:
4687: =head2 Resource Status
4688:
4689: Problem resources have status information, reflecting their various
4690: dates and completion statuses.
4691:
4692: There are two aspects to the status: the date-related information and
4693: the completion information.
4694:
4695: Idiomatic usage of these two methods would probably look something
4696: like
4697:
4698: foreach my $part ($resource->parts()) {
4699: my $dateStatus = $resource->getDateStatus($part);
4700: my $completionStatus = $resource->getCompletionStatus($part);
4701:
4702: or
4703:
4704: my $status = $resource->status($part);
4705:
4706: ... use it here ...
4707: }
4708:
4709: Which you use depends on exactly what you are looking for. The
4710: status() function has been optimized for the nav maps display and may
4711: not precisely match what you need elsewhere.
4712:
4713: The symbolic constants shown below can be accessed through the
4714: resource object: C<$res->OPEN>.
4715:
4716: =over 4
4717:
4718: =item * B<getDateStatus>($part):
4719:
4720: ($part defaults to 0). A convenience function that returns a symbolic
4721: constant telling you about the date status of the part. The possible
4722: return values are:
4723:
4724: =back
4725:
4726: B<Date Codes>
4727:
4728: =over 4
4729:
4730: =item * B<OPEN_LATER>:
4731:
4732: The problem will be opened later.
4733:
4734: =item * B<OPEN>:
4735:
4736: Open and not yet due.
4737:
4738:
4739: =item * B<PAST_DUE_ANSWER_LATER>:
4740:
4741: The due date has passed, but the answer date has not yet arrived.
4742:
4743: =item * B<PAST_DUE_NO_ANSWER>:
4744:
4745: The due date has passed and there is no answer opening date set.
4746:
4747: =item * B<ANSWER_OPEN>:
4748:
4749: The answer date is here.
4750:
4751: =item * B<NETWORK_FAILURE>:
4752:
4753: The information is unknown due to network failure.
4754:
4755: =back
4756:
4757: =cut
4758:
4759: # Apparently the compiler optimizes these into constants automatically
4760: sub OPEN_LATER { return 0; }
4761: sub OPEN { return 1; }
4762: sub PAST_DUE_NO_ANSWER { return 2; }
4763: sub PAST_DUE_ANSWER_LATER { return 3; }
4764: sub ANSWER_OPEN { return 4; }
4765: sub NOTHING_SET { return 5; }
4766: sub NETWORK_FAILURE { return 100; }
4767:
4768: # getDateStatus gets the date status for a given problem part.
4769: # Because answer date, due date, and open date are fully independent
4770: # (i.e., it is perfectly possible to *only* have an answer date),
4771: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4772: # (past, future, none given). This function handles this with a decision
4773: # tree. Read the comments to follow the decision tree.
4774:
4775: sub getDateStatus {
4776: my $self = shift;
4777: my $part = shift;
4778: $part = "0" if (!defined($part));
4779:
4780: # Always return network failure if there was one.
4781: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4782:
4783: my $now = time();
4784:
4785: my $open = $self->opendate($part);
4786: my $due = $self->duedate($part);
4787: my $answer = $self->answerdate($part);
4788:
4789: if (!$open && !$due && !$answer) {
4790: # no data on the problem at all
4791: # should this be the same as "open later"? think multipart.
4792: return $self->NOTHING_SET;
4793: }
4794: if (!$open || $now < $open) {return $self->OPEN_LATER}
4795: if (!$due || $now < $due) {return $self->OPEN}
4796: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4797: if ($answer) { return $self->ANSWER_OPEN; }
4798: return PAST_DUE_NO_ANSWER;
4799: }
4800:
4801: =pod
4802:
4803: B<>
4804:
4805: =over 4
4806:
4807: =item * B<getCompletionStatus>($part):
4808:
4809: ($part defaults to 0.) A convenience function that returns a symbolic
4810: constant telling you about the completion status of the part, with the
4811: following possible results:
4812:
4813: =back
4814:
4815: B<Completion Codes>
4816:
4817: =over 4
4818:
4819: =item * B<NOT_ATTEMPTED>:
4820:
4821: Has not been attempted at all.
4822:
4823: =item * B<INCORRECT>:
4824:
4825: Attempted, but wrong by student.
4826:
4827: =item * B<INCORRECT_BY_OVERRIDE>:
4828:
4829: Attempted, but wrong by instructor override.
4830:
4831: =item * B<CORRECT>:
4832:
4833: Correct or correct by instructor.
4834:
4835: =item * B<CORRECT_BY_OVERRIDE>:
4836:
4837: Correct by instructor override.
4838:
4839: =item * B<EXCUSED>:
4840:
4841: Excused. Not yet implemented.
4842:
4843: =item * B<NETWORK_FAILURE>:
4844:
4845: Information not available due to network failure.
4846:
4847: =item * B<ATTEMPTED>:
4848:
4849: Attempted, and not yet graded.
4850:
4851: =item * B<CREDIT_ATTEMPTED>:
4852:
4853: Attempted, and credit received for attempt (survey and anonymous survey only).
4854:
4855: =back
4856:
4857: =cut
4858:
4859: sub NOT_ATTEMPTED { return 10; }
4860: sub INCORRECT { return 11; }
4861: sub INCORRECT_BY_OVERRIDE { return 12; }
4862: sub CORRECT { return 13; }
4863: sub CORRECT_BY_OVERRIDE { return 14; }
4864: sub EXCUSED { return 15; }
4865: sub ATTEMPTED { return 16; }
4866: sub CREDIT_ATTEMPTED { return 17; }
4867:
4868: sub getCompletionStatus {
4869: my $self = shift;
4870: my $part = shift;
4871: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4872:
4873: my $status = $self->queryRestoreHash('solved', $part);
4874:
4875: # Left as separate if statements in case we ever do more with this
4876: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4877: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4878: if ($status eq 'correct_by_override') {
4879: return $self->CORRECT_BY_OVERRIDE;
4880: }
4881: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4882: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4883: if ($status eq 'excused') {return $self->EXCUSED; }
4884: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4885: if ($status eq 'credit_attempted') {
4886: if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
4887: return $self->CREDIT_ATTEMPTED;
4888: } else {
4889: return $self->ATTEMPTED;
4890: }
4891: }
4892: return $self->NOT_ATTEMPTED;
4893: }
4894:
4895: sub queryRestoreHash {
4896: my $self = shift;
4897: my $hashentry = shift;
4898: my $part = shift;
4899: $part = "0" if (!defined($part) || $part eq '');
4900: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4901:
4902: $self->getReturnHash();
4903:
4904: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4905: }
4906:
4907: =pod
4908:
4909: B<Composite Status>
4910:
4911: Along with directly returning the date or completion status, the
4912: resource object includes a convenience function B<status>() that will
4913: combine the two status tidbits into one composite status that can
4914: represent the status of the resource as a whole. This method represents
4915: the concept of the thing we want to display to the user on the nav maps
4916: screen, which is a combination of completion and open status. The precise logic is
4917: documented in the comments of the status method. The following results
4918: may be returned, all available as methods on the resource object
4919: ($res->NETWORK_FAILURE): In addition to the return values that match
4920: the date or completion status, this function can return "ANSWER_SUBMITTED"
4921: if that problemstatus parameter value is set to No, suppressing the
4922: incorrect/correct feedback.
4923:
4924: =over 4
4925:
4926: =item * B<NETWORK_FAILURE>:
4927:
4928: The network has failed and the information is not available.
4929:
4930: =item * B<NOTHING_SET>:
4931:
4932: No dates have been set for this problem (part) at all. (Because only
4933: certain parts of a multi-part problem may be assigned, this can not be
4934: collapsed into "open later", as we do not know a given part will EVER
4935: be opened. For single part, this is the same as "OPEN_LATER".)
4936:
4937: =item * B<CORRECT>:
4938:
4939: For any reason at all, the part is considered correct.
4940:
4941: =item * B<EXCUSED>:
4942:
4943: For any reason at all, the problem is excused.
4944:
4945: =item * B<PAST_DUE_NO_ANSWER>:
4946:
4947: The problem is past due, not considered correct, and no answer date is
4948: set.
4949:
4950: =item * B<PAST_DUE_ANSWER_LATER>:
4951:
4952: The problem is past due, not considered correct, and an answer date in
4953: the future is set.
4954:
4955: =item * B<ANSWER_OPEN>:
4956:
4957: The problem is past due, not correct, and the answer is now available.
4958:
4959: =item * B<OPEN_LATER>:
4960:
4961: The problem is not yet open.
4962:
4963: =item * B<TRIES_LEFT>:
4964:
4965: The problem is open, has been tried, is not correct, but there are
4966: tries left.
4967:
4968: =item * B<INCORRECT>:
4969:
4970: The problem is open, and all tries have been used without getting the
4971: correct answer.
4972:
4973: =item * B<OPEN>:
4974:
4975: The item is open and not yet tried.
4976:
4977: =item * B<ATTEMPTED>:
4978:
4979: The problem has been attempted.
4980:
4981: =item * B<CREDIT_ATTEMPTED>:
4982:
4983: The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
4984:
4985: =item * B<ANSWER_SUBMITTED>:
4986:
4987: An answer has been submitted, but the student should not see it.
4988:
4989: =back
4990:
4991: =cut
4992:
4993: sub TRIES_LEFT { return 20; }
4994: sub ANSWER_SUBMITTED { return 21; }
4995: sub PARTIALLY_CORRECT { return 22; }
4996:
4997: sub RESERVED_LATER { return 30; }
4998: sub RESERVED { return 31; }
4999: sub RESERVED_LOCATION { return 32; }
5000: sub RESERVABLE { return 33; }
5001: sub RESERVABLE_LATER { return 34; }
5002: sub NOTRESERVABLE { return 35; }
5003: sub NOT_IN_A_SLOT { return 36; }
5004: sub NEEDS_CHECKIN { return 37; }
5005: sub WAITING_FOR_GRADE { return 38; }
5006: sub UNKNOWN { return 39; }
5007:
5008: sub status {
5009: my $self = shift;
5010: my $part = shift;
5011: if (!defined($part)) { $part = "0"; }
5012: my $completionStatus = $self->getCompletionStatus($part);
5013: my $dateStatus = $self->getDateStatus($part);
5014:
5015: # What we have is a two-dimensional matrix with 4 entries on one
5016: # dimension and 5 entries on the other, which we want to colorize,
5017: # plus network failure and "no date data at all".
5018:
5019: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
5020: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
5021:
5022: my $suppressFeedback = 0;
5023: if (($self->problemstatus($part) eq 'no') ||
5024: ($self->problemstatus($part) eq 'no_feedback_ever')) {
5025: $suppressFeedback = 1;
5026: }
5027: # If there's an answer date and we're past it, don't
5028: # suppress the feedback; student should know
5029: if ($self->duedate($part) && $self->duedate($part) < time() &&
5030: $self->answerdate($part) && $self->answerdate($part) < time()) {
5031: $suppressFeedback = 0;
5032: }
5033:
5034: # There are a few whole rows we can dispose of:
5035: if ($completionStatus == CORRECT ||
5036: $completionStatus == CORRECT_BY_OVERRIDE ) {
5037: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
5038: my $awarded=$self->awarded($part);
5039: if ($awarded < 1 && $awarded > 0) {
5040: return PARTIALLY_CORRECT;
5041: } elsif ($awarded<1) {
5042: return INCORRECT;
5043: }
5044: return CORRECT;
5045: }
5046:
5047: # If it's WRONG... and not open
5048: if ( ($completionStatus == INCORRECT ||
5049: $completionStatus == INCORRECT_BY_OVERRIDE)
5050: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
5051: return INCORRECT;
5052: }
5053:
5054: if ($completionStatus == ATTEMPTED) {
5055: return ATTEMPTED;
5056: }
5057:
5058: if ($completionStatus == CREDIT_ATTEMPTED) {
5059: return CREDIT_ATTEMPTED;
5060: }
5061:
5062: # If it's EXCUSED, then return that no matter what
5063: if ($completionStatus == EXCUSED) {
5064: return EXCUSED;
5065: }
5066:
5067: if ($dateStatus == NOTHING_SET) {
5068: return NOTHING_SET;
5069: }
5070:
5071: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
5072: # by 4 matrix (date statuses).
5073:
5074: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
5075: $dateStatus == PAST_DUE_NO_ANSWER ) {
5076: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
5077: }
5078:
5079: if ($dateStatus == ANSWER_OPEN) {
5080: return ANSWER_OPEN;
5081: }
5082:
5083: # Now: (incorrect, incorrect_override, not_attempted) x
5084: # (open_later), (open)
5085:
5086: if ($dateStatus == OPEN_LATER) {
5087: return OPEN_LATER;
5088: }
5089:
5090: # If it's WRONG...
5091: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
5092: # and there are TRIES LEFT:
5093: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5094: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
5095: }
5096: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
5097: }
5098:
5099: # Otherwise, it's untried and open
5100: return OPEN;
5101: }
5102:
5103: sub check_for_slot {
5104: my $self = shift;
5105: my $part = shift;
5106: my $symb = $self->symb();
5107: my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
5108: if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
5109: my @slots = (split(/:/,$availablestudent),split(/:/,$available));
5110: my $cid=$env{'request.course.id'};
5111: my $cdom=$env{'course.'.$cid.'.domain'};
5112: my $cnum=$env{'course.'.$cid.'.num'};
5113: my $now = time;
5114: my $num_usable_slots = 0;
5115: if (@slots > 0) {
5116: my %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
5117: if (&Apache::lonnet::error(%slots)) {
5118: return (UNKNOWN);
5119: }
5120: my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots,'starttime');
5121: my ($checkedin,$checkedinslot);
5122: foreach my $slot_name (@sorted_slots) {
5123: next if (!defined($slots{$slot_name}) || !ref($slots{$slot_name}));
5124: my $end = $slots{$slot_name}->{'endtime'};
5125: my $start = $slots{$slot_name}->{'starttime'};
5126: my $ip = $slots{$slot_name}->{'ip'};
5127: if ($self->simpleStatus() == OPEN) {
5128: if ($end > $now) {
5129: if ($start > $now) {
5130: return (RESERVED_LATER,$start,$slot_name);
5131: } else {
5132: if ($ip ne '') {
5133: if (!&Apache::loncommon::check_ip_acc($ip)) {
5134: return (RESERVED_LOCATION,$ip,$slot_name);
5135: }
5136: }
5137: my @proctors;
5138: if ($slots{$slot_name}->{'proctor'} ne '') {
5139: @proctors = split(',',$slots{$slot_name}->{'proctor'});
5140: }
5141: if (@proctors > 0) {
5142: ($checkedin,$checkedinslot) = $self->checkedin();
5143: unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
5144: ($checkedinslot eq $slot_name)) {
5145: return (NEEDS_CHECKIN,undef,$slot_name);
5146: }
5147: }
5148: return (RESERVED,$end,$slot_name);
5149: }
5150: }
5151: } elsif ($end > $now) {
5152: $num_usable_slots ++;
5153: }
5154: }
5155: my ($is_correct,$got_grade);
5156: if ($self->is_task()) {
5157: my $taskstatus = $self->taskstatus();
5158: $is_correct = (($taskstatus eq 'pass') ||
5159: ($self->solved() =~ /^correct_/));
5160: $got_grade = ($taskstatus =~ /^(?:pass|fail)$/);
5161: } else {
5162: $got_grade = 1;
5163: $is_correct = ($self->solved() =~ /^correct_/);
5164: }
5165: ($checkedin,$checkedinslot) = $self->checkedin();
5166: if ($checkedin) {
5167: if (!$got_grade) {
5168: return (WAITING_FOR_GRADE);
5169: } elsif ($is_correct) {
5170: return (CORRECT);
5171: }
5172: }
5173: if ($num_usable_slots) {
5174: return(NOT_IN_A_SLOT);
5175: }
5176: }
5177: my $reservable = &Apache::lonnet::get_reservable_slots($cnum,$cdom,$env{'user.name'},
5178: $env{'user.domain'});
5179: if (ref($reservable) eq 'HASH') {
5180: if ((ref($reservable->{'now_order'}) eq 'ARRAY') && (ref($reservable->{'now'}) eq 'HASH')) {
5181: foreach my $slot (reverse (@{$reservable->{'now_order'}})) {
5182: if (($reservable->{'now'}{$slot}{'symb'} eq '') ||
5183: ($reservable->{'now'}{$slot}{'symb'} eq $symb)) {
5184: return(RESERVABLE,$reservable->{'now'}{$slot}{'endreserve'});
5185: }
5186: }
5187: }
5188: if ((ref($reservable->{'future_order'}) eq 'ARRAY') && (ref($reservable->{'future'}) eq 'HASH')) {
5189: foreach my $slot (@{$reservable->{'future_order'}}) {
5190: if (($reservable->{'future'}{$slot}{'symb'} eq '') ||
5191: ($reservable->{'future'}{$slot}{'symb'} eq $symb)) {
5192: return(RESERVABLE_LATER,$reservable->{'future'}{$slot}{'startreserve'});
5193: }
5194: }
5195: }
5196: }
5197: return(NOTRESERVABLE);
5198: }
5199: return;
5200: }
5201:
5202: sub CLOSED { return 23; }
5203: sub ERROR { return 24; }
5204:
5205: =pod
5206:
5207: B<Simple Status>
5208:
5209: Convenience method B<simpleStatus> provides a "simple status" for the resource.
5210: "Simple status" corresponds to "which icon is shown on the
5211: Navmaps". There are six "simple" statuses:
5212:
5213: =over 4
5214:
5215: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
5216:
5217: =item * B<OPEN>: The problem is open and unattempted.
5218:
5219: =item * B<CORRECT>: The problem is correct for any reason.
5220:
5221: =item * B<INCORRECT>: The problem is incorrect and can still be
5222: completed successfully.
5223:
5224: =item * B<ATTEMPTED>: The problem has been attempted, but the student
5225: does not know if they are correct. (The ellipsis icon.)
5226:
5227: =item * B<ERROR>: There is an error retrieving information about this
5228: problem.
5229:
5230: =back
5231:
5232: =cut
5233:
5234: # This hash maps the composite status to this simple status, and
5235: # can be used directly, if you like
5236: my %compositeToSimple =
5237: (
5238: NETWORK_FAILURE() => ERROR,
5239: NOTHING_SET() => CLOSED,
5240: CORRECT() => CORRECT,
5241: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
5242: EXCUSED() => CORRECT,
5243: PAST_DUE_NO_ANSWER() => INCORRECT,
5244: PAST_DUE_ANSWER_LATER() => INCORRECT,
5245: ANSWER_OPEN() => INCORRECT,
5246: OPEN_LATER() => CLOSED,
5247: TRIES_LEFT() => OPEN,
5248: INCORRECT() => INCORRECT,
5249: OPEN() => OPEN,
5250: ATTEMPTED() => ATTEMPTED,
5251: CREDIT_ATTEMPTED() => CORRECT,
5252: ANSWER_SUBMITTED() => ATTEMPTED
5253: );
5254:
5255: sub simpleStatus {
5256: my $self = shift;
5257: my $part = shift;
5258: my $status = $self->status($part);
5259: return $compositeToSimple{$status};
5260: }
5261:
5262: =pod
5263:
5264: B<simpleStatusCount> will return an array reference containing, in
5265: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
5266: and ERROR parts the given problem has.
5267:
5268: =cut
5269:
5270: # This maps the status to the slot we want to increment
5271: my %statusToSlotMap =
5272: (
5273: OPEN() => 0,
5274: CLOSED() => 1,
5275: CORRECT() => 2,
5276: INCORRECT() => 3,
5277: ATTEMPTED() => 4,
5278: ERROR() => 5
5279: );
5280:
5281: sub statusToSlot { return $statusToSlotMap{shift()}; }
5282:
5283: sub simpleStatusCount {
5284: my $self = shift;
5285:
5286: my @counts = (0, 0, 0, 0, 0, 0, 0);
5287: foreach my $part (@{$self->parts()}) {
5288: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
5289: }
5290:
5291: return \@counts;
5292: }
5293:
5294: =pod
5295:
5296: B<Completable>
5297:
5298: The completable method represents the concept of I<whether the student can
5299: currently do the problem>. If the student can do the problem, which means
5300: that it is open, there are tries left, and if the problem is manually graded
5301: or the grade is suppressed via problemstatus, the student has not tried it
5302: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
5303: either the student has tried it and there is no feedback, or that for
5304: some reason it is no longer completable (not open yet, successfully completed,
5305: out of tries, etc.). As an example, this is used as the filter for the
5306: "Uncompleted Homework" option for the nav maps.
5307:
5308: If this does not quite meet your needs, do not fiddle with it (unless you are
5309: fixing it to better match the student's conception of "completable" because
5310: it's broken somehow)... make a new method.
5311:
5312: =cut
5313:
5314: sub completable {
5315: my $self = shift;
5316: if (!$self->is_problem()) { return 0; }
5317: my $partCount = $self->countParts();
5318:
5319: foreach my $part (@{$self->parts()}) {
5320: if ($part eq '0' && $partCount != 1) { next; }
5321: my $status = $self->status($part);
5322: # "If any of the parts are open, or have tries left (implies open),
5323: # and it is not "attempted" (manually graded problem), it is
5324: # not "complete"
5325: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5326: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5327: $status == ANSWER_SUBMITTED() ) {
5328: # did this part already, as well as we can
5329: next;
5330: }
5331: if ($status == OPEN() || $status == TRIES_LEFT()) {
5332: return 1;
5333: }
5334: }
5335:
5336: # If all the parts were complete, so was this problem.
5337: return 0;
5338: }
5339:
5340: =pod
5341:
5342: =head2 Resource/Nav Map Navigation
5343:
5344: =over 4
5345:
5346: =item * B<getNext>():
5347:
5348: Retreive an array of the possible next resources after this
5349: one. Always returns an array, even in the one- or zero-element case.
5350:
5351: =item * B<getPrevious>():
5352:
5353: Retreive an array of the possible previous resources from this
5354: one. Always returns an array, even in the one- or zero-element case.
5355:
5356: =cut
5357:
5358: sub getNext {
5359: my $self = shift;
5360: my @branches;
5361: my $to = $self->to();
5362: foreach my $branch ( split(/,/, $to) ) {
5363: my $choice = $self->{NAV_MAP}->getById($branch);
5364: #if (!$choice->condition()) { next; }
5365: my $next = $choice->goesto();
5366: $next = $self->{NAV_MAP}->getById($next);
5367:
5368: push @branches, $next;
5369: }
5370: return \@branches;
5371: }
5372:
5373: sub getPrevious {
5374: my $self = shift;
5375: my @branches;
5376: my $from = $self->from();
5377: foreach my $branch ( split /,/, $from) {
5378: my $choice = $self->{NAV_MAP}->getById($branch);
5379: my $prev = $choice->comesfrom();
5380: $prev = $self->{NAV_MAP}->getById($prev);
5381:
5382: push @branches, $prev;
5383: }
5384: return \@branches;
5385: }
5386:
5387: sub browsePriv {
5388: my $self = shift;
5389: if (defined($self->{BROWSE_PRIV})) {
5390: return $self->{BROWSE_PRIV};
5391: }
5392:
5393: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
5394: $self->symb());
5395: }
5396:
5397: =pod
5398:
5399: =back
5400:
5401: =cut
5402:
5403: 1;
5404:
5405: __END__
5406:
5407:
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