1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.424 2009/02/14 12:20:10 schulted Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: =pod
31:
32: =head1 NAME
33:
34: Apache::lonnavmaps.pm
35:
36: =head1 SYNOPSIS
37:
38: Handles navigational maps.
39:
40: The main handler generates the navigational listing for the course,
41: the other objects export this information in a usable fashion for
42: other modules.
43:
44:
45: This is part of the LearningOnline Network with CAPA project
46: described at http://www.lon-capa.org.
47:
48:
49: =head1 OVERVIEW
50:
51: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
52: course structure and caches it in what is often referred to as the
53: "big hash" X<big hash>. You can see it if you are logged into
54: LON-CAPA, in a course, by going to /adm/test. (You may need to
55: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
56: content of the hash will be under the heading "Big Hash".
57:
58: Big Hash contains, among other things, how resources are related
59: to each other (next/previous), what resources are maps, which
60: resources are being chosen to not show to the student (for random
61: selection), and a lot of other things that can take a lot of time
62: to compute due to the amount of data that needs to be collected and
63: processed.
64:
65: Apache::lonnavmaps provides an object model for manipulating this
66: information in a higher-level fashion than directly manipulating
67: the hash. It also provides access to several auxilary functions
68: that aren't necessarily stored in the Big Hash, but are a per-
69: resource sort of value, like whether there is any feedback on
70: a given resource.
71:
72: Apache::lonnavmaps also abstracts away branching, and someday,
73: conditions, for the times where you don't really care about those
74: things.
75:
76: Apache::lonnavmaps also provides fairly powerful routines for
77: rendering navmaps, and last but not least, provides the navmaps
78: view for when the user clicks the NAV button.
79:
80: B<Note>: Apache::lonnavmaps I<only> works for the "currently
81: logged in user"; if you want things like "due dates for another
82: student" lonnavmaps can not directly retrieve information like
83: that. You need the EXT function. This module can still help,
84: because many things, such as the course structure, are constant
85: between users, and Apache::lonnavmaps can help by providing
86: symbs for the EXT call.
87:
88: The rest of this file will cover the provided rendering routines,
89: which can often be used without fiddling with the navmap object at
90: all, then documents the Apache::lonnavmaps::navmap object, which
91: is the key to accessing the Big Hash information, covers the use
92: of the Iterator (which provides the logic for traversing the
93: somewhat-complicated Big Hash data structure), documents the
94: Apache::lonnavmaps::Resource objects that are returned by
95:
96: =head1 Subroutine: render
97:
98: The navmap renderer package provides a sophisticated rendering of the
99: standard navigation maps interface into HTML. The provided nav map
100: handler is actually just a glorified call to this.
101:
102: Because of the large number of parameters this function accepts,
103: instead of passing it arguments as is normal, pass it in an anonymous
104: hash with the desired options.
105:
106: The package provides a function called 'render', called as
107: Apache::lonnavmaps::render({}).
108:
109: =head2 Overview of Columns
110:
111: The renderer will build an HTML table for the navmap and return
112: it. The table consists of several columns, and a row for each
113: resource (or possibly each part). You tell the renderer how many
114: columns to create and what to place in each column, optionally using
115: one or more of the prepared columns, and the renderer will assemble
116: the table.
117:
118: Any additional generally useful column types should be placed in the
119: renderer code here, so anybody can use it anywhere else. Any code
120: specific to the current application (such as the addition of <input>
121: elements in a column) should be placed in the code of the thing using
122: the renderer.
123:
124: At the core of the renderer is the array reference COLS (see Example
125: section below for how to pass this correctly). The COLS array will
126: consist of entries of one of two types of things: Either an integer
127: representing one of the pre-packaged column types, or a sub reference
128: that takes a resource reference, a part number, and a reference to the
129: argument hash passed to the renderer, and returns a string that will
130: be inserted into the HTML representation as it.
131:
132: All other parameters are ways of either changing how the columns
133: are printing, or which rows are shown.
134:
135: The pre-packaged column names are refered to by constants in the
136: Apache::lonnavmaps namespace. The following currently exist:
137:
138: =over 4
139:
140: =item * B<Apache::lonnavmaps::resource>:
141:
142: The general info about the resource: Link, icon for the type, etc. The
143: first column in the standard nav map display. This column provides the
144: indentation effect seen in the B<NAV> screen. This column also accepts
145: the following parameters in the renderer hash:
146:
147: =over 4
148:
149: =item * B<resource_nolink>: default false
150:
151: If true, the resource will not be linked. By default, all non-folder
152: resources are linked.
153:
154: =item * B<resource_part_count>: default true
155:
156: If true, the resource will show a part count B<if> the full
157: part list is not displayed. (See "condense_parts" later.) If false,
158: the resource will never show a part count.
159:
160: =item * B<resource_no_folder_link>:
161:
162: If true, the resource's folder will not be clickable to open or close
163: it. Default is false. True implies printCloseAll is false, since you
164: can't close or open folders when this is on anyhow.
165:
166: =back
167:
168: =item * B<Apache::lonnavmaps::communication_status>:
169:
170: Whether there is discussion on the resource, email for the user, or
171: (lumped in here) perl errors in the execution of the problem. This is
172: the second column in the main nav map.
173:
174: =item * B<Apache::lonnavmaps::quick_status>:
175:
176: An icon for the status of a problem, with five possible states:
177: Correct, incorrect, open, awaiting grading (for a problem where the
178: computer's grade is suppressed, or the computer can't grade, like
179: essay problem), or none (not open yet, not a problem). The
180: third column of the standard navmap.
181:
182: =item * B<Apache::lonnavmaps::long_status>:
183:
184: A text readout of the details of the current status of the problem,
185: such as "Due in 22 hours". The fourth column of the standard navmap.
186:
187: =item * B<Apache::lonnavmaps::part_status_summary>:
188:
189: A text readout summarizing the status of the problem. If it is a
190: single part problem, will display "Correct", "Incorrect",
191: "Not yet open", "Open", "Attempted", or "Error". If there are
192: multiple parts, this will output a string that in HTML will show a
193: status of how many parts are in each status, in color coding, trying
194: to match the colors of the icons within reason.
195:
196: Note this only makes sense if you are I<not> showing parts. If
197: C<showParts> is true (see below), this column will not output
198: anything.
199:
200: =back
201:
202: If you add any others please be sure to document them here.
203:
204: An example of a column renderer that will show the ID number of a
205: resource, along with the part name if any:
206:
207: sub {
208: my ($resource, $part, $params) = @_;
209: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
210: return '<td>' . $resource->{ID} . '</td>';
211: }
212:
213: Note these functions are responsible for the TD tags, which allow them
214: to override vertical and horizontal alignment, etc.
215:
216: =head2 Parameters
217:
218: Minimally, you should be
219: able to get away with just using 'cols' (to specify the columns
220: shown), 'url' (necessary for the folders to link to the current screen
221: correctly), and possibly 'queryString' if your app calls for it. In
222: that case, maintaining the state of the folders will be done
223: automatically.
224:
225: =over 4
226:
227: =item * B<iterator>: default: constructs one from %env
228:
229: A reference to a fresh ::iterator to use from the navmaps. The
230: rendering will reflect the options passed to the iterator, so you can
231: use that to just render a certain part of the course, if you like. If
232: one is not passed, the renderer will attempt to construct one from
233: env{'form.filter'} and env{'form.condition'} information, plus the
234: 'iterator_map' parameter if any.
235:
236: =item * B<iterator_map>: default: not used
237:
238: If you are letting the renderer do the iterator handling, you can
239: instruct the renderer to render only a particular map by passing it
240: the source of the map you want to process, like
241: '/res/103/jerf/navmap.course.sequence'.
242:
243: =item * B<include_top_level_map>: default: false
244:
245: If you need to include the top level map (meaning the course) in the
246: rendered output set this to true
247:
248: =item * B<navmap>: default: constructs one from %env
249:
250: A reference to a navmap, used only if an iterator is not passed in. If
251: this is necessary to make an iterator but it is not passed in, a new
252: one will be constructed based on env info. This is useful to do basic
253: error checking before passing it off to render.
254:
255: =item * B<r>: default: must be passed in
256:
257: The standard Apache response object. This must be passed to the
258: renderer or the course hash will be locked.
259:
260: =item * B<cols>: default: empty (useless)
261:
262: An array reference
263:
264: =item * B<showParts>:default true
265:
266: A flag. If true, a line for the resource itself, and a line
267: for each part will be displayed. If not, only one line for each
268: resource will be displayed.
269:
270: =item * B<condenseParts>: default true
271:
272: A flag. If true, if all parts of the problem have the same
273: status and that status is Nothing Set, Correct, or Network Failure,
274: then only one line will be displayed for that resource anyhow. If no,
275: all parts will always be displayed. If showParts is 0, this is
276: ignored.
277:
278: =item * B<jumpCount>: default: determined from %env
279:
280: A string identifying the URL to place the anchor 'curloc' at.
281: It is the responsibility of the renderer user to
282: ensure that the #curloc is in the URL. By default, determined through
283: the use of the env{} 'jump' information, and should normally "just
284: work" correctly.
285:
286: =item * B<here>: default: empty string
287:
288: A Symb identifying where to place the 'here' marker. The empty
289: string means no marker.
290:
291: =item * B<indentString>: default: 25 pixel whitespace image
292:
293: A string identifying the indentation string to use.
294:
295: =item * B<queryString>: default: empty
296:
297: A string which will be prepended to the query string used when the
298: folders are opened or closed. You can use this to pass
299: application-specific values.
300:
301: =item * B<url>: default: none
302:
303: The url the folders will link to, which should be the current
304: page. Required if the resource info column is shown, and you
305: are allowing the user to open and close folders.
306:
307: =item * B<currentJumpIndex>: default: no jumping
308:
309: Describes the currently-open row number to cause the browser to jump
310: to, because the user just opened that folder. By default, pulled from
311: the Jump information in the env{'form.*'}.
312:
313: =item * B<printKey>: default: false
314:
315: If true, print the key that appears on the top of the standard
316: navmaps.
317:
318: =item * B<printCloseAll>: default: true
319:
320: If true, print the "Close all folders" or "open all folders"
321: links.
322:
323: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
324:
325: A function that takes the resource object as its only parameter and
326: returns a true or false value. If true, the resource is displayed. If
327: false, it is simply skipped in the display.
328:
329: =item * B<suppressEmptySequences>: default: false
330:
331: If you're using a filter function, and displaying sequences to orient
332: the user, then frequently some sequences will be empty. Setting this to
333: true will cause those sequences not to display, so as not to confuse the
334: user into thinking that if the sequence is there there should be things
335: under it; for example, see the "Show Uncompleted Homework" view on the
336: B<NAV> screen.
337:
338: =item * B<suppressNavmaps>: default: false
339:
340: If true, will not display Navigate Content resources.
341:
342: =back
343:
344: =head2 Additional Info
345:
346: In addition to the parameters you can pass to the renderer, which will
347: be passed through unchange to the column renderers, the renderer will
348: generate the following information which your renderer may find
349: useful:
350:
351: =over 4
352:
353: =item * B<counter>:
354:
355: Contains the number of rows printed. Useful after calling the render
356: function, as you can detect whether anything was printed at all.
357:
358: =item * B<isNewBranch>:
359:
360: Useful for renderers: If this resource is currently the first resource
361: of a new branch, this will be true. The Resource column (leftmost in the
362: navmaps screen) uses this to display the "new branch" icon
363:
364: =back
365:
366: =cut
367:
368:
369: =head1 SUBROUTINES
370:
371: =over
372:
373: =item update()
374:
375: =item addToFilter()
376:
377: Convenience functions: Returns a string that adds or subtracts
378: the second argument from the first hash, appropriate for the
379: query string that determines which folders to recurse on
380:
381: =item removeFromFilter()
382:
383: =item getLinkForResource()
384:
385: Convenience function: Given a stack returned from getStack on the iterator,
386: return the correct src() value.
387:
388: =item getDescription()
389:
390: Convenience function: This separates the logic of how to create
391: the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
392: etc.) into a separate function. It takes a resource object as the
393: first parameter, and the part number of the resource as the second.
394: It's basically a big switch statement on the status of the resource.
395:
396: =item dueInLessThan24Hours()
397:
398: Convenience function, so others can use it: Is the problem due in less than 24 hours, and still can be done?
399:
400: =item lastTry()
401:
402: Convenience function, so others can use it: Is there only one try remaining for the
403: part, with more than one try to begin with, not due yet and still can be done?
404:
405: =item advancedUser()
406:
407: This puts a human-readable name on the env variable.
408:
409: =item timeToHumanString()
410:
411: timeToHumanString takes a time number and converts it to a
412: human-readable representation, meant to be used in the following
413: manner:
414:
415: =over 4
416:
417: =item * print "Due $timestring"
418:
419: =item * print "Open $timestring"
420:
421: =item * print "Answer available $timestring"
422:
423: =back
424:
425: Very, very, very, VERY English-only... goodness help a localizer on
426: this func...
427:
428: =item resource()
429:
430: returns 0
431:
432: =item communication_status()
433:
434: returns 1
435:
436: =item quick_status()
437:
438: returns 2
439:
440: =item long_status()
441:
442: returns 3
443:
444: =item part_status_summary()
445:
446: returns 4
447:
448: =item render_resource()
449:
450: =item render_communication_status()
451:
452: =item render_quick_status()
453:
454: =item render_long_status()
455:
456: =item render_parts_summary_status()
457:
458: =item setDefault()
459:
460: =item cmp_title()
461:
462: =item render()
463:
464: =item add_linkitem()
465:
466: =item show_linkitems()
467:
468: =back
469:
470: =cut
471:
472: package Apache::lonnavmaps;
473:
474: use strict;
475: use GDBM_File;
476: use Apache::loncommon();
477: use Apache::lonenc();
478: use Apache::lonlocal;
479: use Apache::lonnet;
480: use POSIX qw (floor strftime);
481: use Time::HiRes qw( gettimeofday tv_interval );
482: use LONCAPA;
483: use DateTime();
484:
485: # symbolic constants
486: sub SYMB { return 1; }
487: sub URL { return 2; }
488: sub NOTHING { return 3; }
489:
490: # Some data
491:
492: my $resObj = "Apache::lonnavmaps::resource";
493:
494: # Keep these mappings in sync with lonquickgrades, which uses the colors
495: # instead of the icons.
496: my %statusIconMap =
497: (
498: $resObj->CLOSED => '',
499: $resObj->OPEN => 'navmap.open.gif',
500: $resObj->CORRECT => 'navmap.correct.gif',
501: $resObj->PARTIALLY_CORRECT => 'navmap.partial.gif',
502: $resObj->INCORRECT => 'navmap.wrong.gif',
503: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
504: $resObj->ERROR => ''
505: );
506:
507: my %iconAltTags =
508: ( 'navmap.correct.gif' => 'Correct',
509: 'navmap.wrong.gif' => 'Incorrect',
510: 'navmap.open.gif' => 'Open' );
511:
512: # Defines a status->color mapping, null string means don't color
513: my %colormap =
514: ( $resObj->NETWORK_FAILURE => '',
515: $resObj->CORRECT => '',
516: $resObj->EXCUSED => '#3333FF',
517: $resObj->PAST_DUE_ANSWER_LATER => '',
518: $resObj->PAST_DUE_NO_ANSWER => '',
519: $resObj->ANSWER_OPEN => '#006600',
520: $resObj->OPEN_LATER => '',
521: $resObj->TRIES_LEFT => '',
522: $resObj->INCORRECT => '',
523: $resObj->OPEN => '',
524: $resObj->NOTHING_SET => '',
525: $resObj->ATTEMPTED => '',
526: $resObj->ANSWER_SUBMITTED => '',
527: $resObj->PARTIALLY_CORRECT => '#006600'
528: );
529: # And a special case in the nav map; what to do when the assignment
530: # is not yet done and due in less than 24 hours
531: my $hurryUpColor = "#FF0000";
532:
533: sub close {
534: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
535: return(<<ENDCLOSE);
536: <script type="text/javascript">
537: window.status='Accessing Nav Control';
538: menu=window.open("/adm/rat/empty.html","loncapanav",
539: "height=600,width=400,scrollbars=1");
540: window.status='Closing Nav Control';
541: menu.close();
542: window.status='Done.';
543: </script>
544: ENDCLOSE
545: }
546:
547: sub update {
548: if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
549: if (!$env{'request.course.id'}) { return ''; }
550: if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
551: return(<<ENDUPDATE);
552: <form name="navform"></form>
553: <script type="text/javascript">
554: this.document.navform.action='/adm/navmaps#curloc';
555: this.document.navform.target='loncapanav';
556: this.document.navform.submit();
557: </script>
558: ENDUPDATE
559: }
560:
561:
562: sub addToFilter {
563: my $hashIn = shift;
564: my $addition = shift;
565: my %hash = %$hashIn;
566: $hash{$addition} = 1;
567:
568: return join (",", keys(%hash));
569: }
570:
571: sub removeFromFilter {
572: my $hashIn = shift;
573: my $subtraction = shift;
574: my %hash = %$hashIn;
575:
576: delete $hash{$subtraction};
577: return join(",", keys(%hash));
578: }
579:
580: sub getLinkForResource {
581: my $stack = shift;
582: my $res;
583:
584: # Check to see if there are any pages in the stack
585: foreach $res (@$stack) {
586: if (defined($res)) {
587: my $anchor;
588: if ($res->is_page()) {
589: foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; } }
590: $anchor=&escape($anchor->shown_symb());
591: return ($res->link(),$res->shown_symb(),$anchor);
592: }
593: # in case folder was skipped over as "only sequence"
594: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
595: if ($map=~/\.page$/) {
596: my $url=&Apache::lonnet::clutter($map);
597: $anchor=&escape($src->shown_symb());
598: return ($url,$res->shown_symb(),$anchor);
599: }
600: }
601: }
602:
603: # Failing that, return the src of the last resource that is defined
604: # (when we first recurse on a map, it puts an undefined resource
605: # on the bottom because $self->{HERE} isn't defined yet, and we
606: # want the src for the map anyhow)
607: foreach my $item (@$stack) {
608: if (defined($item)) { $res = $item; }
609: }
610:
611: if ($res) {
612: return ($res->link(),$res->shown_symb());
613: }
614: return;
615: }
616:
617:
618:
619: sub getDescription {
620: my $res = shift;
621: my $part = shift;
622: my $status = $res->status($part);
623:
624: my $open = $res->opendate($part);
625: my $due = $res->duedate($part);
626: my $answer = $res->answerdate($part);
627:
628: if ($status == $res->NETWORK_FAILURE) {
629: return &mt("Having technical difficulties; please check status later");
630: }
631: if ($status == $res->NOTHING_SET) {
632: return &mt("Not currently assigned.");
633: }
634: if ($status == $res->OPEN_LATER) {
635: return &mt("Open ") .timeToHumanString($open,'start');
636: }
637: if ($status == $res->OPEN) {
638: if ($due) {
639: if ($res->is_practice()) {
640: return &mt("Closes ")." " .timeToHumanString($due,'start');
641: } else {
642: return &mt("Due")." " .timeToHumanString($due,'end');
643: }
644: } else {
645: return &mt("Open, no due date");
646: }
647: }
648: if ($status == $res->PAST_DUE_ANSWER_LATER) {
649: return &mt("Answer open")." " .timeToHumanString($answer,'start');
650: }
651: if ($status == $res->PAST_DUE_NO_ANSWER) {
652: if ($res->is_practice()) {
653: return &mt("Closed")." " . timeToHumanString($due,'start');
654: } else {
655: return &mt("Was due")." " . timeToHumanString($due,'end');
656: }
657: }
658: if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
659: && $res->handgrade($part) ne 'yes') {
660: return &mt("Answer available");
661: }
662: if ($status == $res->EXCUSED) {
663: return &mt("Excused by instructor");
664: }
665: if ($status == $res->ATTEMPTED) {
666: return &mt("Answer submitted, not yet graded");
667: }
668: if ($status == $res->TRIES_LEFT) {
669: my $tries = $res->tries($part);
670: my $maxtries = $res->maxtries($part);
671: my $triesString = "";
672: if ($tries && $maxtries) {
673: $triesString = '<font size="-1"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></font>';
674: if ($maxtries > 1 && $maxtries - $tries == 1) {
675: $triesString = "<b>$triesString</b>";
676: }
677: }
678: if ($due) {
679: return &mt("Due")." " . timeToHumanString($due,'end') .
680: " $triesString";
681: } else {
682: return &mt("No due date")." $triesString";
683: }
684: }
685: if ($status == $res->ANSWER_SUBMITTED) {
686: return &mt('Answer submitted');
687: }
688: }
689:
690:
691: sub dueInLessThan24Hours {
692: my $res = shift;
693: my $part = shift;
694: my $status = $res->status($part);
695:
696: return ($status == $res->OPEN() ||
697: $status == $res->TRIES_LEFT()) &&
698: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
699: $res->duedate($part) > time();
700: }
701:
702:
703: sub lastTry {
704: my $res = shift;
705: my $part = shift;
706:
707: my $tries = $res->tries($part);
708: my $maxtries = $res->maxtries($part);
709: return $tries && $maxtries && $maxtries > 1 &&
710: $maxtries - $tries == 1 && $res->duedate($part) &&
711: $res->duedate($part) > time();
712: }
713:
714:
715: sub advancedUser {
716: return $env{'request.role.adv'};
717: }
718:
719: sub timeToHumanString {
720: my ($time,$type,$format) = @_;
721:
722: # zero, '0' and blank are bad times
723: if (!$time) {
724: return &mt('never');
725: }
726: unless (&Apache::lonlocal::current_language()=~/^en/) {
727: return &Apache::lonlocal::locallocaltime($time);
728: }
729: my $now = time();
730:
731: # Positive = future
732: my $delta = $time - $now;
733:
734: my $minute = 60;
735: my $hour = 60 * $minute;
736: my $day = 24 * $hour;
737: my $week = 7 * $day;
738: my $inPast = 0;
739:
740: # Logic in comments:
741: # Is it now? (extremely unlikely)
742: if ( $delta == 0 ) {
743: return "this instant";
744: }
745:
746: if ($delta < 0) {
747: $inPast = 1;
748: $delta = -$delta;
749: }
750:
751: if ( $delta > 0 ) {
752:
753: my $tense = $inPast ? " ago" : "";
754: my $prefix = $inPast ? "" : "in ";
755:
756: # Less than a minute
757: if ( $delta < $minute ) {
758: if ($delta == 1) { return "${prefix}1 second$tense"; }
759: return "$prefix$delta seconds$tense";
760: }
761:
762: # Less than an hour
763: if ( $delta < $hour ) {
764: # If so, use minutes
765: my $minutes = floor($delta / 60);
766: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
767: return "$prefix$minutes minutes$tense";
768: }
769:
770: # Is it less than 24 hours away? If so,
771: # display hours + minutes
772: if ( $delta < $hour * 24) {
773: my $hours = floor($delta / $hour);
774: my $minutes = floor(($delta % $hour) / $minute);
775: my $hourString = "$hours hours";
776: my $minuteString = ", $minutes minutes";
777: if ($hours == 1) {
778: $hourString = "1 hour";
779: }
780: if ($minutes == 1) {
781: $minuteString = ", 1 minute";
782: }
783: if ($minutes == 0) {
784: $minuteString = "";
785: }
786: return "$prefix$hourString$minuteString$tense";
787: }
788:
789: my $dt = DateTime->from_epoch(epoch => $time)
790: ->set_time_zone(&Apache::lonlocal::gettimezone());
791:
792: # If there's a caller supplied format, use it.
793:
794: if ($format ne '') {
795: my $timeStr = $dt->strftime($format);
796: return $timeStr.' ('.$dt->time_zone_short_name().')';
797: }
798:
799: # Less than 5 days away, display day of the week and
800: # HH:MM
801:
802: if ( $delta < $day * 5 ) {
803: my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
804: $timeStr =~ s/12:00 am/00:00/;
805: $timeStr =~ s/12:00 pm/noon/;
806: return ($inPast ? "last " : "this ") .
807: $timeStr;
808: }
809:
810: my $conjunction='on';
811: if ($type eq 'start') {
812: $conjunction='at';
813: } elsif ($type eq 'end') {
814: $conjunction='by';
815: }
816: # Is it this year?
817: my $dt_now = DateTime->from_epoch(epoch => $now)
818: ->set_time_zone(&Apache::lonlocal::gettimezone());
819: if ( $dt->year() == $dt_now->year()) {
820: # Return on Month Day, HH:MM meridian
821: my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
822: $timeStr =~ s/12:00 am/00:00/;
823: $timeStr =~ s/12:00 pm/noon/;
824: return $timeStr;
825: }
826:
827: # Not this year, so show the year
828: my $timeStr =
829: $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
830: $timeStr =~ s/12:00 am/00:00/;
831: $timeStr =~ s/12:00 pm/noon/;
832: return $timeStr;
833: }
834: }
835:
836:
837: sub resource { return 0; }
838: sub communication_status { return 1; }
839: sub quick_status { return 2; }
840: sub long_status { return 3; }
841: sub part_status_summary { return 4; }
842:
843: sub render_resource {
844: my ($resource, $part, $params) = @_;
845:
846: my $nonLinkedText = ''; # stuff after resource title not in link
847:
848: my $link = $params->{"resourceLink"};
849:
850: # The URL part is not escaped at this point, but the symb is...
851: # The stuff to the left of the ? must have ' replaced by \' since
852: # it will be quoted with ' in the href.
853:
854: my ($left,$right) = split(/\?/, $link);
855: $link = $left.'?'.$right;
856:
857: my $src = $resource->src();
858: my $it = $params->{"iterator"};
859: my $filter = $it->{FILTER};
860:
861: my $title = $resource->compTitle();
862:
863: my $partLabel = "";
864: my $newBranchText = "";
865: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
866: # If this is a new branch, label it so
867: if ($params->{'isNewBranch'}) {
868: $newBranchText = "<img src='$location/branch.gif' border='0' alt='Branch' />";
869: }
870:
871: # links to open and close the folder
872:
873:
874: my $linkopen = "<a href=\"$link\">";
875:
876:
877: my $linkclose = "</a>";
878:
879: # Default icon: unknown page
880: my $icon = "<img src='$location/unknown.gif' alt='' border='0' alt=' ' ' />";
881:
882: if ($resource->is_problem()) {
883: if ($part eq '0' || $params->{'condensed'}) {
884: $icon = '<img src="'.$location.'/';
885: if ($resource->is_task()) {
886: $icon .= 'task.gif" alt="'.&mt('Task');
887: } else {
888: $icon .= 'problem.gif" alt="'.&mt('Problem');
889: }
890: $icon .='" border="0" />';
891: } else {
892: $icon = $params->{'indentString'};
893: }
894: } else {
895: $icon = "<img src='".&Apache::loncommon::icon($resource->src)."' alt=' ' border='0' />";
896: }
897:
898: # Display the correct map icon to open or shut map
899: if ($resource->is_map()) {
900: my $mapId = $resource->map_pc();
901: my $nowOpen = !defined($filter->{$mapId});
902: if ($it->{CONDITION}) {
903: $nowOpen = !$nowOpen;
904: }
905:
906: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
907: my $title=$resource->title;
908: $title=~s/\"/\"/g;
909: if (!$params->{'resource_no_folder_link'}) {
910: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
911: $icon = "<img src='$location/$icon' alt=\"".
912: ($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" border='0' />";
913:
914: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
915: $params->{'queryString'} . '&filter=';
916: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
917: addToFilter($filter, $mapId) :
918: removeFromFilter($filter, $mapId);
919: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
920: . $params->{'hereType'} . '&here=' .
921: &escape($params->{'here'}) .
922: '&jump=' .
923: &escape($resource->symb()) .
924: "&folderManip=1\">";
925:
926: } else {
927: # Don't allow users to manipulate folder
928: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
929: '.nomanip.gif';
930: $icon = "<img src='$location/$icon' alt=\"".
931: ($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" border='0' />";
932:
933: $linkopen = "";
934: $linkclose = "";
935: }
936: }
937:
938: if ($resource->randomout()) {
939: $nonLinkedText .= ' <i>('.&mt('hidden').')</i> ';
940: }
941: if (!$resource->condval()) {
942: $nonLinkedText .= ' <i>('.&mt('conditionally hidden').')</i> ';
943: }
944: if (($resource->is_practice()) && ($resource->is_raw_problem())) {
945: $nonLinkedText .=' <font color="green"><b>'.&mt('not graded').'</b></font>';
946: }
947:
948: # We're done preparing and finally ready to start the rendering
949: my $result = "<td align='left' valign='middle'>";
950:
951: my $indentLevel = $params->{'indentLevel'};
952: if ($newBranchText) { $indentLevel--; }
953:
954: # print indentation
955: for (my $i = 0; $i < $indentLevel; $i++) {
956: $result .= $params->{'indentString'};
957: }
958:
959: # Decide what to display
960:
961: $result .= "$newBranchText$linkopen$icon$linkclose";
962:
963: my $curMarkerBegin = '';
964: my $curMarkerEnd = '';
965:
966: # Is this the current resource?
967: if (!$params->{'displayedHereMarker'} &&
968: $resource->symb() eq $params->{'here'} ) {
969: $curMarkerBegin = '<em style="font-weight:bold;">';
970: $curMarkerEnd = '</em>';
971: $params->{'displayedHereMarker'} = 1;
972: }
973:
974: if ($resource->is_problem() && $part ne '0' &&
975: !$params->{'condensed'}) {
976: my $displaypart=$resource->part_display($part);
977: $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
978: if ($link!~/\#/) { $link.='#'.&escape($part); }
979: $title = "";
980: }
981:
982: if ($params->{'condensed'} && $resource->countParts() > 1) {
983: $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
984: }
985:
986: my $target;
987: if ($env{'environment.remotenavmap'} eq 'on') {
988: $target=' target="loncapaclient" ';
989: }
990: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
991: $result .= " $curMarkerBegin<a $target href=\"$link\">$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
992: } else {
993: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
994: }
995:
996: return $result;
997: }
998:
999: sub render_communication_status {
1000: my ($resource, $part, $params) = @_;
1001: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1002:
1003: my $link = $params->{"resourceLink"};
1004: my $target;
1005: if ($env{'environment.remotenavmap'} eq 'on') {
1006: $target=' target="loncapaclient" ';
1007: }
1008: my $linkopen = "<a $target href=\"$link\">";
1009: my $linkclose = "</a>";
1010: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1011: if ($resource->hasDiscussion()) {
1012: $discussionHTML = $linkopen .
1013: '<img alt="'.&mt('New Discussion').'" border="0" src="'.$location.'/chat.gif" />' .
1014: $linkclose;
1015: }
1016:
1017: if ($resource->getFeedback()) {
1018: my $feedback = $resource->getFeedback();
1019: foreach my $msgid (split(/\,/, $feedback)) {
1020: if ($msgid) {
1021: $feedbackHTML .= ' <a '.$target.' href="/adm/email?display='
1022: . &escape($msgid) . '">'
1023: . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" '
1024: . 'border="0" /></a>';
1025: }
1026: }
1027: }
1028:
1029: if ($resource->getErrors()) {
1030: my $errors = $resource->getErrors();
1031: my $errorcount = 0;
1032: foreach my $msgid (split(/,/, $errors)) {
1033: last if ($errorcount>=10); # Only output 10 bombs maximum
1034: if ($msgid) {
1035: $errorcount++;
1036: $errorHTML .= ' <a '.$target.' href="/adm/email?display='
1037: . &escape($msgid) . '">'
1038: . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" '
1039: . 'border="0" /></a>';
1040: }
1041: }
1042: }
1043:
1044: if ($params->{'multipart'} && $part != '0') {
1045: $discussionHTML = $feedbackHTML = $errorHTML = '';
1046: }
1047:
1048: return "<td width=\"75\" align=\"left\" valign=\"middle\">$discussionHTML$feedbackHTML$errorHTML </td>";
1049:
1050: }
1051: sub render_quick_status {
1052: my ($resource, $part, $params) = @_;
1053: my $result = "";
1054: my $firstDisplayed = !$params->{'condensed'} &&
1055: $params->{'multipart'} && $part eq "0";
1056:
1057: my $link = $params->{"resourceLink"};
1058: my $target;
1059: if ($env{'environment.remotenavmap'} eq 'on') {
1060: $target=' target="loncapaclient" ';
1061: }
1062: my $linkopen = "<a $target href=\"$link\">";
1063: my $linkclose = "</a>";
1064:
1065: if ($resource->is_problem() &&
1066: !$firstDisplayed) {
1067:
1068: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1069: my $alt = $iconAltTags{$icon};
1070: if ($icon) {
1071: my $location=
1072: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1073: $result .= "<td valign='middle' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1074: } else {
1075: $result .= "<td width='30'> </td>\n";
1076: }
1077: } else { # not problem, no icon
1078: $result .= "<td width='30'> </td>\n";
1079: }
1080:
1081: return $result;
1082: }
1083: sub render_long_status {
1084: my ($resource, $part, $params) = @_;
1085: my $result = "<td align='right' valign='middle'>\n";
1086: my $firstDisplayed = !$params->{'condensed'} &&
1087: $params->{'multipart'} && $part eq "0";
1088:
1089: my $color;
1090: if ($resource->is_problem() || $resource->is_practice()) {
1091: $color = $colormap{$resource->status};
1092:
1093: if (dueInLessThan24Hours($resource, $part) ||
1094: lastTry($resource, $part)) {
1095: $color = $hurryUpColor;
1096: }
1097: }
1098:
1099: if ($resource->kind() eq "res" &&
1100: ($resource->is_problem() || $resource->is_practice()) &&
1101: !$firstDisplayed) {
1102: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1103: $result .= getDescription($resource, $part);
1104: if ($color) {$result .= "</b></font>"; }
1105: }
1106: if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1107: $result .= &mt('(randomly select [_1])', $resource->randompick());
1108: }
1109: if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
1110: $result .= &mt('(randomly ordered)');
1111: }
1112:
1113: # Debugging code
1114: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1115: # ' - Part: ' . $part;
1116:
1117: $result .= "</td>\n";
1118:
1119: return $result;
1120: }
1121:
1122: # Colors obtained by taking the icons, matching the colors, and
1123: # possibly reducing the Value (HSV) of the color, if it's too bright
1124: # for text, generally by one third or so.
1125: my %statusColors =
1126: (
1127: $resObj->CLOSED => '#000000',
1128: $resObj->OPEN => '#998b13',
1129: $resObj->CORRECT => '#26933f',
1130: $resObj->INCORRECT => '#c48207',
1131: $resObj->ATTEMPTED => '#a87510',
1132: $resObj->ERROR => '#000000'
1133: );
1134: my %statusStrings =
1135: (
1136: $resObj->CLOSED => 'Not yet open',
1137: $resObj->OPEN => 'Open',
1138: $resObj->CORRECT => 'Correct',
1139: $resObj->INCORRECT => 'Incorrect',
1140: $resObj->ATTEMPTED => 'Attempted',
1141: $resObj->ERROR => 'Network Error'
1142: );
1143: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1144:
1145: sub render_parts_summary_status {
1146: my ($resource, $part, $params) = @_;
1147: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1148: if ($params->{showParts}) {
1149: return '<td></td>';
1150: }
1151:
1152: my $td = "<td align='right'>\n";
1153: my $endtd = "</td>\n";
1154: my @probs;
1155:
1156: if ($resource->contains_problem) {
1157: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1158: } else {
1159: @probs=($resource);
1160: }
1161: my $return;
1162: my %overallstatus;
1163: my $totalParts;
1164: foreach my $resource (@probs) {
1165: # If there is a single part, just show the simple status
1166: if ($resource->singlepart()) {
1167: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1168: $overallstatus{$status}++;
1169: $totalParts++;
1170: next;
1171: }
1172: # Now we can be sure the $part doesn't really matter.
1173: my $statusCount = $resource->simpleStatusCount();
1174: my @counts;
1175: foreach my $status (@statuses) {
1176: # decouple display order from the simpleStatusCount order
1177: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1178: if ($statusCount->[$slot]) {
1179: $overallstatus{$status}+=$statusCount->[$slot];
1180: $totalParts+=$statusCount->[$slot];
1181: }
1182: }
1183: }
1184: $return.= $td . $totalParts . ' parts: ';
1185: foreach my $status (@statuses) {
1186: if ($overallstatus{$status}) {
1187: $return.="<font color='" . $statusColors{$status} .
1188: "'>" . $overallstatus{$status} . ' '
1189: . $statusStrings{$status} . "</font>";
1190: }
1191: }
1192: $return.= $endtd;
1193: return $return;
1194: }
1195:
1196: my @preparedColumns = (\&render_resource, \&render_communication_status,
1197: \&render_quick_status, \&render_long_status,
1198: \&render_parts_summary_status);
1199:
1200: sub setDefault {
1201: my ($val, $default) = @_;
1202: if (!defined($val)) { return $default; }
1203: return $val;
1204: }
1205:
1206: sub cmp_title {
1207: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1208: $atitle=~s/^\s*//;
1209: $btitle=~s/^\s*//;
1210: return $atitle cmp $btitle;
1211: }
1212:
1213: sub render {
1214: my $args = shift;
1215: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1216: my $result = '';
1217: # Configure the renderer.
1218: my $cols = $args->{'cols'};
1219: if (!defined($cols)) {
1220: # no columns, no nav maps.
1221: return '';
1222: }
1223: my $navmap;
1224: if (defined($args->{'navmap'})) {
1225: $navmap = $args->{'navmap'};
1226: }
1227:
1228: my $r = $args->{'r'};
1229: my $queryString = $args->{'queryString'};
1230: my $jump = $args->{'jump'};
1231: my $here = $args->{'here'};
1232: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1233: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1234: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1235: # before the current resource when using #current
1236:
1237: # If we were passed 'here' information, we are not rendering
1238: # after a folder manipulation, and we were not passed an
1239: # iterator, make sure we open the folders to show the "here"
1240: # marker
1241: my $filterHash = {};
1242: # Figure out what we're not displaying
1243: foreach my $item (split(/\,/, $env{"form.filter"})) {
1244: if ($item) {
1245: $filterHash->{$item} = "1";
1246: }
1247: }
1248:
1249: # Filter: Remember filter function and add our own filter: Refuse
1250: # to show hidden resources unless the user can see them.
1251: my $userCanSeeHidden = advancedUser();
1252: my $filterFunc = setDefault($args->{'filterFunc'},
1253: sub {return 1;});
1254: if (!$userCanSeeHidden) {
1255: # Without renaming the filterfunc, the server seems to go into
1256: # an infinite loop
1257: my $oldFilterFunc = $filterFunc;
1258: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1259: &$oldFilterFunc($res);};
1260: }
1261:
1262: my $condition = 0;
1263: if ($env{'form.condition'}) {
1264: $condition = 1;
1265: }
1266:
1267: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1268: # Step 1: Check to see if we have a navmap
1269: if (!defined($navmap)) {
1270: $navmap = Apache::lonnavmaps::navmap->new();
1271: if (!defined($navmap)) {
1272: # no longer in course
1273: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1274: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1275: }
1276: }
1277:
1278: # Step two: Locate what kind of here marker is necessary
1279: # Determine where the "here" marker is and where the screen jumps to.
1280:
1281: if ($env{'form.postsymb'} ne '') {
1282: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1283: } elsif ($env{'form.postdata'} ne '') {
1284: # couldn't find a symb, is there a URL?
1285: my $currenturl = $env{'form.postdata'};
1286: #$currenturl=~s/^http\:\/\///;
1287: #$currenturl=~s/^[^\/]+//;
1288:
1289: $here = $jump = &Apache::lonnet::symbread($currenturl);
1290: }
1291: if ($here eq '') {
1292: my $last;
1293: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1294: &GDBM_READER(),0640)) {
1295: $last=$hash{'last_known'};
1296: untie(%hash);
1297: }
1298: if ($last) { $here = $jump = $last; }
1299: }
1300:
1301: # Step three: Ensure the folders are open
1302: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1303: my $curRes;
1304: my $found = 0;
1305:
1306: # We only need to do this if we need to open the maps to show the
1307: # current position. This will change the counter so we can't count
1308: # for the jump marker with this loop.
1309: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1310: if (ref($curRes) && $curRes->symb() eq $here) {
1311: my $mapStack = $mapIterator->getStack();
1312:
1313: # Ensure the parent maps are open
1314: for my $map (@{$mapStack}) {
1315: if ($condition) {
1316: undef $filterHash->{$map->map_pc()};
1317: } else {
1318: $filterHash->{$map->map_pc()} = 1;
1319: }
1320: }
1321: $found = 1;
1322: }
1323: }
1324: }
1325:
1326: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1327: # If this is a click on a folder or something, we want to preserve the "here"
1328: # from the querystring, and get the new "jump" marker
1329: $here = $env{'form.here'};
1330: $jump = $env{'form.jump'};
1331: }
1332:
1333: my $it = $args->{'iterator'};
1334: if (!defined($it)) {
1335: # Construct a default iterator based on $env{'form.'} information
1336:
1337: # Step 1: Check to see if we have a navmap
1338: if (!defined($navmap)) {
1339: $navmap = Apache::lonnavmaps::navmap->new();
1340: if (!defined($navmap)) {
1341: # no longer in course
1342: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1343: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1344: }
1345: }
1346:
1347: # See if we're being passed a specific map
1348: if ($args->{'iterator_map'}) {
1349: my $map = $args->{'iterator_map'};
1350: $map = $navmap->getResourceByUrl($map);
1351: my $firstResource = $map->map_start();
1352: my $finishResource = $map->map_finish();
1353:
1354: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1355: } else {
1356: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1357: }
1358: }
1359:
1360: # (re-)Locate the jump point, if any
1361: # Note this does not take filtering or hidden into account... need
1362: # to be fixed?
1363: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1364: my $curRes;
1365: my $foundJump = 0;
1366: my $counter = 0;
1367:
1368: while (($curRes = $mapIterator->next()) && !$foundJump) {
1369: if (ref($curRes)) { $counter++; }
1370:
1371: if (ref($curRes) && $jump eq $curRes->symb()) {
1372:
1373: # This is why we have to use the main iterator instead of the
1374: # potentially faster DFS: The count has to be the same, so
1375: # the order has to be the same, which DFS won't give us.
1376: $args->{'currentJumpIndex'} = $counter;
1377: $foundJump = 1;
1378: }
1379: }
1380:
1381: my $showParts = setDefault($args->{'showParts'}, 1);
1382: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1383: # keeps track of when the current resource is found,
1384: # so we can back up a few and put the anchor above the
1385: # current resource
1386: my $printKey = $args->{'printKey'};
1387: my $printCloseAll = $args->{'printCloseAll'};
1388: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1389:
1390: # Print key?
1391: if ($printKey) {
1392: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1393: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1394: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1395: if ($navmap->{LAST_CHECK}) {
1396: $result .=
1397: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1398: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1399: '</td><td align="center" valign="bottom"> '.
1400: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1401: '</td>';
1402: } else {
1403: $result .= '<td align="center" valign="bottom"> '.
1404: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1405: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1406: '</td>';
1407: }
1408:
1409: $result .= '</tr></table>';
1410: }
1411:
1412: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1413: my ($link,$text);
1414: if ($condition) {
1415: $link='"navmaps?condition=0&filter=&'.$queryString.
1416: '&here='.&escape($here).'"';
1417: $text='Close all folders';
1418: } else {
1419: $link='"navmaps?condition=1&filter=&'.$queryString.
1420: '&here='.&escape($here).'"';
1421: $text='Open all folders';
1422: }
1423: if ($args->{'caller'} eq 'navmapsdisplay') {
1424: &add_linkitem($args->{'linkitems'},'changefolder',
1425: 'location.href='.$link,$text);
1426: } else {
1427: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1428: }
1429: $result .= "\n";
1430: }
1431:
1432: # Check for any unread discussions in all resources.
1433: if ($args->{'caller'} eq 'navmapsdisplay') {
1434: &add_linkitem($args->{'linkitems'},'clearbubbles',
1435: 'document.clearbubbles.submit()',
1436: 'Mark all posts read');
1437: my $time=time;
1438: $result .= (<<END);
1439: <form name="clearbubbles" method="post" action="/adm/feedback">
1440: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1441: <input type="hidden" name="navtime" value="$time" />
1442: END
1443: if ($args->{'sort'} eq 'discussion') {
1444: my $totdisc = 0;
1445: my $haveDisc = '';
1446: my @allres=$navmap->retrieveResources();
1447: foreach my $resource (@allres) {
1448: if ($resource->hasDiscussion()) {
1449: $haveDisc .= $resource->wrap_symb().':';
1450: $totdisc ++;
1451: }
1452: }
1453: if ($totdisc > 0) {
1454: $haveDisc =~ s/:$//;
1455: $result .= (<<END);
1456: <input type="hidden" name="navmaps" value="$haveDisc" />
1457: </form>
1458: END
1459: }
1460: }
1461: $result.='</form>';
1462: }
1463:
1464: if ($args->{'caller'} eq 'navmapsdisplay') {
1465: $result .= '<table><tr><td>'.
1466: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td>';
1467: if ($env{'environment.remotenavmap'} ne 'on') {
1468: $result .= '<td> </td>';
1469: } else {
1470: $result .= '</tr><tr>';
1471: }
1472: $result.=&show_linkitems($args->{'linkitems'});
1473: if ($args->{'sort_html'}) {
1474: if ($env{'environment.remotenavmap'} ne 'on') {
1475: $result.='<td> </td><td> </td><td> </td>'.
1476: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1477: } else {
1478: $result.='</tr><tr><td align="left"><br />'.
1479: $args->{'sort_html'}.'</td></tr>';
1480: }
1481: }
1482: $result .= '</table>';
1483: } elsif ($args->{'sort_html'}) {
1484: $result.=$args->{'sort_html'};
1485: }
1486:
1487: $result .= "<br />\n";
1488: if ($r) {
1489: $r->print($result);
1490: $r->rflush();
1491: $result = "";
1492: }
1493: # End parameter setting
1494:
1495: # Data
1496: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1497: my $res = "Apache::lonnavmaps::resource";
1498: my %condenseStatuses =
1499: ( $res->NETWORK_FAILURE => 1,
1500: $res->NOTHING_SET => 1,
1501: $res->CORRECT => 1 );
1502: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1503:
1504: # Shared variables
1505: $args->{'counter'} = 0; # counts the rows
1506: $args->{'indentLevel'} = 0;
1507: $args->{'isNewBranch'} = 0;
1508: $args->{'condensed'} = 0;
1509: my $location=
1510: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1511: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt=' ' border='0' />");
1512: $args->{'displayedHereMarker'} = 0;
1513:
1514: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1515: # since structure actually doesn't matter, except what map has what resources.
1516: if ($args->{'suppressEmptySequences'}) {
1517: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1518: $it->{FIRST_RESOURCE},
1519: $it->{FINISH_RESOURCE},
1520: {}, undef, 1);
1521: my $depth = 0;
1522: $dfsit->next();
1523: my $curRes = $dfsit->next();
1524: while ($depth > -1) {
1525: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1526: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1527:
1528: if (ref($curRes)) {
1529: # Parallel pre-processing: Do sequences have non-filtered-out children?
1530: if ($curRes->is_map()) {
1531: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1532: # Sequences themselves do not count as visible children,
1533: # unless those sequences also have visible children.
1534: # This means if a sequence appears, there's a "promise"
1535: # that there's something under it if you open it, somewhere.
1536: } else {
1537: # Not a sequence: if it's filtered, ignore it, otherwise
1538: # rise up the stack and mark the sequences as having children
1539: if (&$filterFunc($curRes)) {
1540: for my $sequence (@{$dfsit->getStack()}) {
1541: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1542: }
1543: }
1544: }
1545: }
1546: } continue {
1547: $curRes = $dfsit->next();
1548: }
1549: }
1550:
1551: my $displayedJumpMarker = 0;
1552: # Set up iteration.
1553: my $now = time();
1554: my $in24Hours = $now + 24 * 60 * 60;
1555: my $rownum = 0;
1556:
1557: # export "here" marker information
1558: $args->{'here'} = $here;
1559:
1560: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1561: my @resources;
1562: my $code='';# sub { !(shift->is_map();) };
1563: if ($args->{'sort'} eq 'title') {
1564: my $oldFilterFunc = $filterFunc;
1565: my $filterFunc=
1566: sub {
1567: my ($res)=@_;
1568: if ($res->is_map()) { return 0;}
1569: return &$oldFilterFunc($res);
1570: };
1571: @resources=$navmap->retrieveResources(undef,$filterFunc);
1572: @resources= sort { &cmp_title($a,$b) } @resources;
1573: } elsif ($args->{'sort'} eq 'duedate') {
1574: my $oldFilterFunc = $filterFunc;
1575: my $filterFunc=
1576: sub {
1577: my ($res)=@_;
1578: if (!$res->is_problem()) { return 0;}
1579: return &$oldFilterFunc($res);
1580: };
1581: @resources=$navmap->retrieveResources(undef,$filterFunc);
1582: @resources= sort {
1583: if ($a->duedate ne $b->duedate) {
1584: return $a->duedate cmp $b->duedate;
1585: }
1586: my $value=&cmp_title($a,$b);
1587: return $value;
1588: } @resources;
1589: } elsif ($args->{'sort'} eq 'discussion') {
1590: my $oldFilterFunc = $filterFunc;
1591: my $filterFunc=
1592: sub {
1593: my ($res)=@_;
1594: if (!$res->hasDiscussion() &&
1595: !$res->getFeedback() &&
1596: !$res->getErrors()) { return 0;}
1597: return &$oldFilterFunc($res);
1598: };
1599: @resources=$navmap->retrieveResources(undef,$filterFunc);
1600: @resources= sort { &cmp_title($a,$b) } @resources;
1601: } else {
1602: #unknow sort mechanism or default
1603: undef($args->{'sort'});
1604: }
1605:
1606:
1607: while (1) {
1608: if ($args->{'sort'}) {
1609: $curRes = shift(@resources);
1610: } else {
1611: $curRes = $it->next($closeAllPages);
1612: }
1613: if (!$curRes) { last; }
1614:
1615: # Maintain indentation level.
1616: if ($curRes == $it->BEGIN_MAP() ||
1617: $curRes == $it->BEGIN_BRANCH() ) {
1618: $args->{'indentLevel'}++;
1619: }
1620: if ($curRes == $it->END_MAP() ||
1621: $curRes == $it->END_BRANCH() ) {
1622: $args->{'indentLevel'}--;
1623: }
1624: # Notice new branches
1625: if ($curRes == $it->BEGIN_BRANCH()) {
1626: $args->{'isNewBranch'} = 1;
1627: }
1628:
1629: # If this isn't an actual resource, continue on
1630: if (!ref($curRes)) {
1631: next;
1632: }
1633:
1634: # If this has been filtered out, continue on
1635: if (!(&$filterFunc($curRes))) {
1636: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1637: next;
1638: }
1639:
1640: # If this is an empty sequence and we're filtering them, continue on
1641: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1642: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1643: next;
1644: }
1645:
1646: # If we're suppressing navmaps and this is a navmap, continue on
1647: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1648: next;
1649: }
1650:
1651: $args->{'counter'}++;
1652:
1653: # Does it have multiple parts?
1654: $args->{'multipart'} = 0;
1655: $args->{'condensed'} = 0;
1656: my @parts;
1657:
1658: # Decide what parts to show.
1659: if ($curRes->is_problem() && $showParts) {
1660: @parts = @{$curRes->parts()};
1661: $args->{'multipart'} = $curRes->multipart();
1662:
1663: if ($condenseParts) { # do the condensation
1664: if (!$args->{'condensed'}) {
1665: # Decide whether to condense based on similarity
1666: my $status = $curRes->status($parts[0]);
1667: my $due = $curRes->duedate($parts[0]);
1668: my $open = $curRes->opendate($parts[0]);
1669: my $statusAllSame = 1;
1670: my $dueAllSame = 1;
1671: my $openAllSame = 1;
1672: for (my $i = 1; $i < scalar(@parts); $i++) {
1673: if ($curRes->status($parts[$i]) != $status){
1674: $statusAllSame = 0;
1675: }
1676: if ($curRes->duedate($parts[$i]) != $due ) {
1677: $dueAllSame = 0;
1678: }
1679: if ($curRes->opendate($parts[$i]) != $open) {
1680: $openAllSame = 0;
1681: }
1682: }
1683: # $*allSame is true if all the statuses were
1684: # the same. Now, if they are all the same and
1685: # match one of the statuses to condense, or they
1686: # are all open with the same due date, or they are
1687: # all OPEN_LATER with the same open date, display the
1688: # status of the first non-zero part (to get the 'correct'
1689: # status right, since 0 is never 'correct' or 'open').
1690: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1691: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1692: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1693: @parts = ($parts[0]);
1694: $args->{'condensed'} = 1;
1695: }
1696: }
1697: # Multipart problem with one part: always "condense" (happens
1698: # to match the desirable behavior)
1699: if ($curRes->countParts() == 1) {
1700: @parts = ($parts[0]);
1701: $args->{'condensed'} = 1;
1702: }
1703: }
1704: }
1705:
1706: # If the multipart problem was condensed, "forget" it was multipart
1707: if (scalar(@parts) == 1) {
1708: $args->{'multipart'} = 0;
1709: } else {
1710: # Add part 0 so we display it correctly.
1711: unshift @parts, '0';
1712: }
1713:
1714: {
1715: my ($src,$symb,$anchor,$stack);
1716: if ($args->{'sort'}) {
1717: my $it = $navmap->getIterator(undef, undef, undef, 1);
1718: while ( my $res=$it->next()) {
1719: if (ref($res) &&
1720: $res->symb() eq $curRes->symb()) { last; }
1721: }
1722: $stack=$it->getStack();
1723: } else {
1724: $stack=$it->getStack();
1725: }
1726: ($src,$symb,$anchor)=getLinkForResource($stack);
1727: if (defined($anchor)) { $anchor='#'.$anchor; }
1728: my $srcHasQuestion = $src =~ /\?/;
1729: $args->{"resourceLink"} = $src.
1730: ($srcHasQuestion?'&':'?') .
1731: 'symb=' . &escape($symb).$anchor;
1732: }
1733: # Now, we've decided what parts to show. Loop through them and
1734: # show them.
1735: foreach my $part (@parts) {
1736: $rownum ++;
1737: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1738:
1739: $result .= " <tr bgcolor='$backgroundColor'>\n";
1740:
1741: # Set up some data about the parts that the cols might want
1742: my $filter = $it->{FILTER};
1743:
1744: # Now, display each column.
1745: foreach my $col (@$cols) {
1746: my $colHTML = '';
1747: if (ref($col)) {
1748: $colHTML .= &$col($curRes, $part, $args);
1749: } else {
1750: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1751: }
1752:
1753: # If this is the first column and it's time to print
1754: # the anchor, do so
1755: if ($col == $cols->[0] &&
1756: $args->{'counter'} == $args->{'currentJumpIndex'} -
1757: $currentJumpDelta) {
1758: # Jam the anchor after the <td> tag;
1759: # necessary for valid HTML (which Mozilla requires)
1760: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1761: $displayedJumpMarker = 1;
1762: }
1763: $result .= $colHTML . "\n";
1764: }
1765: $result .= " </tr>\n";
1766: $args->{'isNewBranch'} = 0;
1767: }
1768:
1769: if ($r && $rownum % 20 == 0) {
1770: $r->print($result);
1771: $result = "";
1772: $r->rflush();
1773: }
1774: } continue {
1775: if ($r) {
1776: # If we have the connection, make sure the user is still connected
1777: my $c = $r->connection;
1778: if ($c->aborted()) {
1779: # Who cares what we do, nobody will see it anyhow.
1780: return '';
1781: }
1782: }
1783: }
1784:
1785: # Print out the part that jumps to #curloc if it exists
1786: # delay needed because the browser is processing the jump before
1787: # it finishes rendering, so it goes to the wrong place!
1788: # onload might be better, but this routine has no access to that.
1789: # On mozilla, the 0-millisecond timeout seems to prevent this;
1790: # it's quite likely this might fix other browsers, too, and
1791: # certainly won't hurt anything.
1792: if ($displayedJumpMarker) {
1793: $result .= "
1794: <script>
1795: if (location.href.indexOf('#curloc')==-1) {
1796: setTimeout(\"location += '#curloc';\", 0)
1797: }
1798: </script>";
1799: }
1800:
1801: $result .= "</table>";
1802:
1803: if ($r) {
1804: $r->print($result);
1805: $result = "";
1806: $r->rflush();
1807: }
1808:
1809: return $result;
1810: }
1811:
1812: sub add_linkitem {
1813: my ($linkitems,$name,$cmd,$text)=@_;
1814: $$linkitems{$name}{'cmd'}=$cmd;
1815: $$linkitems{$name}{'text'}=&mt($text);
1816: }
1817:
1818: sub show_linkitems {
1819: my ($linkitems)=@_;
1820: my @linkorder = ("blank","launchnav","closenav","firsthomework",
1821: "everything","uncompleted","changefolder","clearbubbles");
1822:
1823: my $result .= (<<ENDBLOCK);
1824: <td align="left">
1825: <script type="text/javascript">
1826: function changeNavDisplay () {
1827: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
1828: ENDBLOCK
1829: foreach my $link (@linkorder) {
1830: $result.= "if (navchoice == '$link') {".
1831: $linkitems->{$link}{'cmd'}."}\n";
1832: }
1833: $result.='}
1834: </script>
1835: <form name="linkitems" method="post">
1836: <span class="LC_nobreak"><select name="toplink">'."\n";
1837: foreach my $link (@linkorder) {
1838: if (defined($linkitems->{$link})) {
1839: if ($linkitems->{$link}{'text'} ne '') {
1840: $result .= ' <option value="'.$link.'">'.
1841: $linkitems->{$link}{'text'}."</option>\n";
1842: }
1843: }
1844: }
1845: $result .= '</select> <input type="button" name="chgnav"
1846: value="Go" onClick="javascript:changeNavDisplay()" />
1847: </span></form></td>'."\n";
1848:
1849: return $result;
1850: }
1851:
1852: 1;
1853:
1854:
1855:
1856:
1857:
1858:
1859:
1860:
1861:
1862: package Apache::lonnavmaps::navmap;
1863:
1864: =pod
1865:
1866: =head1 Object: Apache::lonnavmaps::navmap
1867:
1868: =head2 Overview
1869:
1870: The navmap object's job is to provide access to the resources
1871: in the course as Apache::lonnavmaps::resource objects, and to
1872: query and manage the relationship between those resource objects.
1873:
1874: Generally, you'll use the navmap object in one of three basic ways.
1875: In order of increasing complexity and power:
1876:
1877: =over 4
1878:
1879: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1880: various ways to obtain resource objects, based on various identifiers.
1881: Use this when you want to request information about one object or
1882: a handful of resources you already know the identities of, from some
1883: other source. For more about Ids, Symbs, and MapPcs, see the
1884: Resource documentation. Note that Url should be a B<last resort>,
1885: not your first choice; it only really works when there is only one
1886: instance of the resource in the course, which only applies to
1887: maps, and even that may change in the future (see the B<getResourceByUrl>
1888: documentation for more details.)
1889:
1890: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1891: retrieves resources matching some criterion and returns them
1892: in a flat array, with no structure information. Use this when
1893: you are manipulating a series of resources, based on what map
1894: the are in, but do not care about branching, or exactly how
1895: the maps and resources are related. This is the most common case.
1896:
1897: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1898: the course's navmap in various ways without writing the traversal
1899: code yourself. See iterator documentation below. Use this when
1900: you need to know absolutely everything about the course, including
1901: branches and the precise relationship between maps and resources.
1902:
1903: =back
1904:
1905: =head2 Creation And Destruction
1906:
1907: To create a navmap object, use the following function:
1908:
1909: =over 4
1910:
1911: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1912:
1913: Creates a new navmap object. Returns the navmap object if this is
1914: successful, or B<undef> if not.
1915:
1916: =back
1917:
1918: =head2 Methods
1919:
1920: =over 4
1921:
1922: =item * B<getIterator>(first, finish, filter, condition):
1923:
1924: See iterator documentation below.
1925:
1926: =cut
1927:
1928: use strict;
1929: use GDBM_File;
1930: use Apache::lonnet;
1931: use LONCAPA;
1932:
1933: sub new {
1934: # magic invocation to create a class instance
1935: my $proto = shift;
1936: my $class = ref($proto) || $proto;
1937: my $self = {};
1938:
1939: # Resource cache stores navmap resources as we reference them. We generate
1940: # them on-demand so we don't pay for creating resources unless we use them.
1941: $self->{RESOURCE_CACHE} = {};
1942:
1943: # Network failure flag, if we accessed the course or user opt and
1944: # failed
1945: $self->{NETWORK_FAILURE} = 0;
1946:
1947: # tie the nav hash
1948:
1949: my %navmaphash;
1950: my %parmhash;
1951: my $courseFn = $env{"request.course.fn"};
1952: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1953: &GDBM_READER(), 0640))) {
1954: return undef;
1955: }
1956:
1957: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1958: &GDBM_READER(), 0640)))
1959: {
1960: untie %{$self->{PARM_HASH}};
1961: return undef;
1962: }
1963:
1964: $self->{NAV_HASH} = \%navmaphash;
1965: $self->{PARM_HASH} = \%parmhash;
1966: $self->{PARM_CACHE} = {};
1967:
1968: bless($self);
1969:
1970: return $self;
1971: }
1972:
1973: sub generate_course_user_opt {
1974: my $self = shift;
1975: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1976:
1977: my $uname=$env{'user.name'};
1978: my $udom=$env{'user.domain'};
1979: my $cid=$env{'request.course.id'};
1980: my $cdom=$env{'course.'.$cid.'.domain'};
1981: my $cnum=$env{'course.'.$cid.'.num'};
1982:
1983: # ------------------------------------------------- Get coursedata (if present)
1984: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
1985: # Check for network failure
1986: if (!ref($courseopt)) {
1987: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
1988: $self->{NETWORK_FAILURE} = 1;
1989: }
1990: undef($courseopt);
1991: }
1992:
1993: # --------------------------------------------------- Get userdata (if present)
1994:
1995: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
1996: # Check for network failure
1997: if (!ref($useropt)) {
1998: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
1999: $self->{NETWORK_FAILURE} = 1;
2000: }
2001: undef($useropt);
2002: }
2003:
2004: $self->{COURSE_OPT} = $courseopt;
2005: $self->{USER_OPT} = $useropt;
2006:
2007: $self->{COURSE_USER_OPT_GENERATED} = 1;
2008:
2009: return;
2010: }
2011:
2012: sub generate_email_discuss_status {
2013: my $self = shift;
2014: my $symb = shift;
2015: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2016:
2017: my $cid=$env{'request.course.id'};
2018: my $cdom=$env{'course.'.$cid.'.domain'};
2019: my $cnum=$env{'course.'.$cid.'.num'};
2020:
2021: my %emailstatus = &Apache::lonnet::dump('email_status');
2022: my $logoutTime = $emailstatus{'logout'};
2023: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2024: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2025: $courseLeaveTime : $logoutTime);
2026: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2027: $cdom, $cnum);
2028: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2029: $env{'user.domain'},$env{'user.name'},'lastread');
2030: my %lastreadtime = ();
2031: foreach my $key (keys %lastread) {
2032: my $shortkey = $key;
2033: $shortkey =~ s/_lastread$//;
2034: $lastreadtime{$shortkey} = $lastread{$key};
2035: }
2036:
2037: my %feedback=();
2038: my %error=();
2039: my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
2040: $env{'user.name'});
2041:
2042: foreach my $msgid (@keys) {
2043: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2044: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
2045: $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
2046: &Apache::lonenc::check_decrypt(\$symb);
2047: if (($fromcid ne '') && ($fromcid ne $cid)) {
2048: next;
2049: }
2050: if (defined($symb)) {
2051: if (defined($error) && $error == 1) {
2052: $error{$symb}.=','.$msgid;
2053: } else {
2054: $feedback{$symb}.=','.$msgid;
2055: }
2056: } else {
2057: my $plain=
2058: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
2059: if ($plain=~/ \[([^\]]+)\]\:/) {
2060: my $url=$1;
2061: if ($plain=~/\:Error \[/) {
2062: $error{$url}.=','.$msgid;
2063: } else {
2064: $feedback{$url}.=','.$msgid;
2065: }
2066: }
2067: }
2068: }
2069: }
2070:
2071: #symbs of resources that have feedbacks (will be urls pre-2.3)
2072: $self->{FEEDBACK} = \%feedback;
2073: #or errors (will be urls pre 2.3)
2074: $self->{ERROR_MSG} = \%error;
2075: $self->{DISCUSSION_TIME} = \%discussiontime;
2076: $self->{EMAIL_STATUS} = \%emailstatus;
2077: $self->{LAST_READ} = \%lastreadtime;
2078:
2079: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2080: }
2081:
2082: sub get_user_data {
2083: my $self = shift;
2084: if ($self->{RETRIEVED_USER_DATA}) { return; }
2085:
2086: # Retrieve performance data on problems
2087: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2088: $env{'user.domain'},
2089: $env{'user.name'});
2090: $self->{STUDENT_DATA} = \%student_data;
2091:
2092: $self->{RETRIEVED_USER_DATA} = 1;
2093: }
2094:
2095: sub get_discussion_data {
2096: my $self = shift;
2097: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2098: return $self->{DISCUSSION_DATA};
2099: }
2100:
2101: $self->generate_email_discuss_status();
2102:
2103: my $cid=$env{'request.course.id'};
2104: my $cdom=$env{'course.'.$cid.'.domain'};
2105: my $cnum=$env{'course.'.$cid.'.num'};
2106: # Retrieve discussion data for resources in course
2107: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
2108:
2109:
2110: $self->{DISCUSSION_DATA} = \%discussion_data;
2111: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2112: return $self->{DISCUSSION_DATA};
2113: }
2114:
2115:
2116: # Internal function: Takes a key to look up in the nav hash and implements internal
2117: # memory caching of that key.
2118: sub navhash {
2119: my $self = shift; my $key = shift;
2120: return $self->{NAV_HASH}->{$key};
2121: }
2122:
2123: =pod
2124:
2125: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2126: false otherwise. Undefined course maps indicate an error somewhere in
2127: LON-CAPA, and you will not be able to proceed with using the navmap.
2128: See the B<NAV> screen for an example of using this.
2129:
2130: =cut
2131:
2132: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2133: sub courseMapDefined {
2134: my $self = shift;
2135: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2136:
2137: my $firstres = $self->navhash("map_start_$uri");
2138: my $lastres = $self->navhash("map_finish_$uri");
2139: return $firstres && $lastres;
2140: }
2141:
2142: sub getIterator {
2143: my $self = shift;
2144: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2145: shift, undef, shift,
2146: shift, shift);
2147: return $iterator;
2148: }
2149:
2150: # Private method: Does the given resource (as a symb string) have
2151: # current discussion? Returns 0 if chat/mail data not extracted.
2152: sub hasDiscussion {
2153: my $self = shift;
2154: my $symb = shift;
2155: $self->generate_email_discuss_status();
2156:
2157: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2158:
2159: #return defined($self->{DISCUSSION_TIME}->{$symb});
2160:
2161: # backward compatibility (bulletin boards used to be 'wrapped')
2162: my $ressymb = $self->wrap_symb($symb);
2163: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2164: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2165: } else {
2166: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2167: 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).
2168: }
2169: }
2170:
2171: sub last_post_time {
2172: my $self = shift;
2173: my $symb = shift;
2174: my $ressymb = $self->wrap_symb($symb);
2175: return $self->{DISCUSSION_TIME}->{$ressymb};
2176: }
2177:
2178: sub discussion_info {
2179: my $self = shift;
2180: my $symb = shift;
2181: my $filter = shift;
2182:
2183: $self->get_discussion_data();
2184:
2185: my $ressymb = $self->wrap_symb($symb);
2186: # keys used to store bulletinboard postings use 'unwrapped' symb.
2187: my $discsymb = &escape($self->unwrap_symb($ressymb));
2188: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2189: if (!$version) { return; }
2190:
2191: my $prevread = $self->{LAST_READ}{$ressymb};
2192:
2193: my $count = 0;
2194: my $hiddenflag = 0;
2195: my $deletedflag = 0;
2196: my ($hidden,$deleted,%info);
2197:
2198: for (my $id=$version; $id>0; $id--) {
2199: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2200: my @keys=split(/:/,$vkeys);
2201: if (grep(/^hidden$/ ,@keys)) {
2202: if (!$hiddenflag) {
2203: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2204: $hiddenflag = 1;
2205: }
2206: } elsif (grep(/^deleted$/,@keys)) {
2207: if (!$deletedflag) {
2208: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2209: $deletedflag = 1;
2210: }
2211: } else {
2212: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2213: if ($filter eq 'unread') {
2214: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2215: next;
2216: }
2217: }
2218: $count++;
2219: $info{$count}{'subject'} =
2220: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2221: $info{$count}{'id'} = $id;
2222: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2223: }
2224: }
2225: }
2226: if (wantarray) {
2227: return ($count,%info);
2228: }
2229: return $count;
2230: }
2231:
2232: sub wrap_symb {
2233: my $self = shift;
2234: my $symb = shift;
2235: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2236: unless ($symb =~ m|adm/wrapper/adm|) {
2237: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2238: }
2239: }
2240: return $symb;
2241: }
2242:
2243: sub unwrap_symb {
2244: my $self = shift;
2245: my $ressymb = shift;
2246: my $discsymb = $ressymb;
2247: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2248: $discsymb = $1.$2;
2249: }
2250: return $discsymb;
2251: }
2252:
2253: # Private method: Does the given resource (as a symb string) have
2254: # current feedback? Returns the string in the feedback hash, which
2255: # will be false if it does not exist.
2256:
2257: sub getFeedback {
2258: my $self = shift;
2259: my $symb = shift;
2260: my $source = shift;
2261:
2262: $self->generate_email_discuss_status();
2263:
2264: if (!defined($self->{FEEDBACK})) { return ""; }
2265:
2266: my $feedback;
2267: if ($self->{FEEDBACK}->{$symb}) {
2268: $feedback = $self->{FEEDBACK}->{$symb};
2269: if ($self->{FEEDBACK}->{$source}) {
2270: $feedback .= ','.$self->{FEEDBACK}->{$source};
2271: }
2272: } else {
2273: if ($self->{FEEDBACK}->{$source}) {
2274: $feedback = $self->{FEEDBACK}->{$source};
2275: }
2276: }
2277: return $feedback;
2278: }
2279:
2280: # Private method: Get the errors for that resource (by source).
2281: sub getErrors {
2282: my $self = shift;
2283: my $symb = shift;
2284: my $src = shift;
2285:
2286: $self->generate_email_discuss_status();
2287:
2288: if (!defined($self->{ERROR_MSG})) { return ""; }
2289:
2290: my $errors;
2291: if ($self->{ERROR_MSG}->{$symb}) {
2292: $errors = $self->{ERROR_MSG}->{$symb};
2293: if ($self->{ERROR_MSG}->{$src}) {
2294: $errors .= ','.$self->{ERROR_MSG}->{$src};
2295: }
2296: } else {
2297: if ($self->{ERROR_MSG}->{$src}) {
2298: $errors = $self->{ERROR_MSG}->{$src};
2299: }
2300: }
2301: return $errors;
2302: }
2303:
2304: =pod
2305:
2306: =item * B<getById>(id):
2307:
2308: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2309: object for that resource. This method, or other methods that use it
2310: (as in the resource object) is the only proper way to obtain a
2311: resource object.
2312:
2313: =item * B<getBySymb>(symb):
2314:
2315: Based on the symb of the resource, get a resource object for that
2316: resource. This is one of the proper ways to get a resource object.
2317:
2318: =item * B<getMapByMapPc>(map_pc):
2319:
2320: Based on the map_pc of the resource, get a resource object for
2321: the given map. This is one of the proper ways to get a resource object.
2322:
2323: =cut
2324:
2325: # The strategy here is to cache the resource objects, and only construct them
2326: # as we use them. The real point is to prevent reading any more from the tied
2327: # hash than we have to, which should hopefully alleviate speed problems.
2328:
2329: sub getById {
2330: my $self = shift;
2331: my $id = shift;
2332:
2333: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2334: {
2335: return $self->{RESOURCE_CACHE}->{$id};
2336: }
2337:
2338: # resource handles inserting itself into cache.
2339: # Not clear why the quotes are necessary, but as of this
2340: # writing it doesn't work without them.
2341: return "Apache::lonnavmaps::resource"->new($self, $id);
2342: }
2343:
2344: sub getBySymb {
2345: my $self = shift;
2346: my $symb = shift;
2347:
2348: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2349: my $map = $self->getResourceByUrl($mapUrl);
2350: my $returnvalue = undef;
2351: if (ref($map)) {
2352: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2353: }
2354: return $returnvalue;
2355: }
2356:
2357: sub getByMapPc {
2358: my $self = shift;
2359: my $map_pc = shift;
2360: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2361: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2362: return $self->getById($map_id);
2363: }
2364:
2365: =pod
2366:
2367: =item * B<firstResource>():
2368:
2369: Returns a resource object reference corresponding to the first
2370: resource in the navmap.
2371:
2372: =cut
2373:
2374: sub firstResource {
2375: my $self = shift;
2376: my $firstResource = $self->navhash('map_start_' .
2377: &Apache::lonnet::clutter($env{'request.course.uri'}));
2378: return $self->getById($firstResource);
2379: }
2380:
2381: =pod
2382:
2383: =item * B<finishResource>():
2384:
2385: Returns a resource object reference corresponding to the last resource
2386: in the navmap.
2387:
2388: =cut
2389:
2390: sub finishResource {
2391: my $self = shift;
2392: my $firstResource = $self->navhash('map_finish_' .
2393: &Apache::lonnet::clutter($env{'request.course.uri'}));
2394: return $self->getById($firstResource);
2395: }
2396:
2397: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2398: # the actual lookup; parmval caches the results.
2399: sub parmval {
2400: my $self = shift;
2401: my ($what,$symb,$recurse)=@_;
2402: my $hashkey = $what."|||".$symb;
2403:
2404: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2405: if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') {
2406: if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
2407: if (wantarray) {
2408: return @{$self->{PARM_CACHE}->{$hashkey}};
2409: } else {
2410: return $self->{PARM_CACHE}->{$hashkey}->[0];
2411: }
2412: }
2413: } else {
2414: return $self->{PARM_CACHE}->{$hashkey};
2415: }
2416: }
2417: my $result = $self->parmval_real($what, $symb, $recurse);
2418: $self->{PARM_CACHE}->{$hashkey} = $result;
2419: if (wantarray) {
2420: return @{$result};
2421: }
2422: return $result->[0];
2423: }
2424:
2425: sub parmval_real {
2426: my $self = shift;
2427: my ($what,$symb,$recurse) = @_;
2428:
2429: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2430: $self->generate_course_user_opt();
2431:
2432: my $cid=$env{'request.course.id'};
2433: my $csec=$env{'request.course.sec'};
2434: my $cgroup='';
2435: my @cgrps=split(/:/,$env{'request.course.groups'});
2436: if (@cgrps > 0) {
2437: @cgrps = sort(@cgrps);
2438: $cgroup = $cgrps[0];
2439: }
2440: my $uname=$env{'user.name'};
2441: my $udom=$env{'user.domain'};
2442:
2443: unless ($symb) { return ['']; }
2444: my $result='';
2445:
2446: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2447: $mapname = &Apache::lonnet::deversion($mapname);
2448: # ----------------------------------------------------- Cascading lookup scheme
2449: my $rwhat=$what;
2450: $what=~s/^parameter\_//;
2451: $what=~s/\_/\./;
2452:
2453: my $symbparm=$symb.'.'.$what;
2454: my $mapparm=$mapname.'___(all).'.$what;
2455: my $usercourseprefix=$cid;
2456:
2457: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2458: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2459: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2460:
2461: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2462: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2463: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2464:
2465: my $courselevel= $usercourseprefix.'.'.$what;
2466: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2467: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2468:
2469: my $useropt = $self->{USER_OPT};
2470: my $courseopt = $self->{COURSE_OPT};
2471: my $parmhash = $self->{PARM_HASH};
2472:
2473: # ---------------------------------------------------------- first, check user
2474: if ($uname and defined($useropt)) {
2475: if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
2476: if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
2477: if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
2478: }
2479:
2480: # ------------------------------------------------------- second, check course
2481: if ($cgroup ne '' and defined($courseopt)) {
2482: if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
2483: if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
2484: if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
2485: }
2486:
2487: if ($csec and defined($courseopt)) {
2488: if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
2489: if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
2490: if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
2491: }
2492:
2493: if (defined($courseopt)) {
2494: if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
2495: }
2496:
2497: # ----------------------------------------------------- third, check map parms
2498:
2499: my $thisparm=$$parmhash{$symbparm};
2500: if (defined($thisparm)) { return [$thisparm,'map']; }
2501:
2502: # ----------------------------------------------------- fourth , check default
2503:
2504: my $meta_rwhat=$rwhat;
2505: $meta_rwhat=~s/\./_/g;
2506: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2507: if (defined($default)) { return [$default,'resource']}
2508: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2509: if (defined($default)) { return [$default,'resource']}
2510: # --------------------------------------------------- fifth, check more course
2511: if (defined($courseopt)) {
2512: if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
2513: if (defined($$courseopt{$courselevel})) {
2514: my $ret = [$$courseopt{$courselevel},'course'];
2515: return $ret;
2516: }
2517: }
2518: # --------------------------------------------------- sixth , cascade up parts
2519:
2520: my ($space,@qualifier)=split(/\./,$rwhat);
2521: my $qualifier=join('.',@qualifier);
2522: unless ($space eq '0') {
2523: my @parts=split(/_/,$space);
2524: my $id=pop(@parts);
2525: my $part=join('_',@parts);
2526: if ($part eq '') { $part='0'; }
2527: my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2528: if (defined($partgeneral[0])) { return \@partgeneral; }
2529: }
2530: if ($recurse) { return []; }
2531: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2532: if (defined($pack_def)) { return [$pack_def,'resource']; }
2533: return [''];
2534: }
2535:
2536: =pod
2537:
2538: =item * B<getResourceByUrl>(url,multiple):
2539:
2540: Retrieves a resource object by URL of the resource, unless the optional
2541: multiple parameter is included in which case an array of resource
2542: objects is returned. If passed a resource object, it will simply return
2543: it, so it is safe to use this method in code like
2544: "$res = $navmap->getResourceByUrl($res)"
2545: if you're not sure if $res is already an object, or just a URL. If the
2546: resource appears multiple times in the course, only the first instance
2547: will be returned (useful for maps), unless the multiple parameter has
2548: been included, in which case all instances are returned in an array.
2549:
2550: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2551:
2552: The map is a specification of a map to retreive the resources from,
2553: either as a url or as an object. The filterFunc is a reference to a
2554: function that takes a resource object as its one argument and returns
2555: true if the resource should be included, or false if it should not
2556: be. If recursive is true, the map will be recursively examined,
2557: otherwise it will not be. If bailout is true, the function will return
2558: as soon as it finds a resource, if false it will finish. If showall is
2559: true it will not hide maps that contain nothing but one other map. By
2560: default, the map is the top-level map of the course, filterFunc is a
2561: function that always returns 1, recursive is true, bailout is false,
2562: showall is false. The resources will be returned in a list containing
2563: the resource objects for the corresponding resources, with B<no
2564: structure information> in the list; regardless of branching,
2565: recursion, etc., it will be a flat list.
2566:
2567: Thus, this is suitable for cases where you don't want the structure,
2568: just a list of all resources. It is also suitable for finding out how
2569: many resources match a given description; for this use, if all you
2570: want to know is if I<any> resources match the description, the bailout
2571: parameter will allow you to avoid potentially expensive enumeration of
2572: all matching resources.
2573:
2574: =item * B<hasResource>(map, filterFunc, recursive, showall):
2575:
2576: Convenience method for
2577:
2578: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2579:
2580: which will tell whether the map has resources matching the description
2581: in the filter function.
2582:
2583: =item * B<usedVersion>(url):
2584:
2585: Retrieves version infomation for a url. Returns the version (a number, or
2586: the string "mostrecent") for resources which have version information in
2587: the big hash.
2588:
2589: =cut
2590:
2591:
2592: sub getResourceByUrl {
2593: my $self = shift;
2594: my $resUrl = shift;
2595: my $multiple = shift;
2596:
2597: if (ref($resUrl)) { return $resUrl; }
2598:
2599: $resUrl = &Apache::lonnet::clutter($resUrl);
2600: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2601: if (!$resId) { return ''; }
2602: if ($multiple) {
2603: my @resources = ();
2604: my @resIds = split (/,/, $resId);
2605: foreach my $id (@resIds) {
2606: my $resourceId = $self->getById($id);
2607: if ($resourceId) {
2608: push(@resources,$resourceId);
2609: }
2610: }
2611: return @resources;
2612: } else {
2613: if ($resId =~ /,/) {
2614: $resId = (split (/,/, $resId))[0];
2615: }
2616: return $self->getById($resId);
2617: }
2618: }
2619:
2620: sub retrieveResources {
2621: my $self = shift;
2622: my $map = shift;
2623: my $filterFunc = shift;
2624: if (!defined ($filterFunc)) {
2625: $filterFunc = sub {return 1;};
2626: }
2627: my $recursive = shift;
2628: if (!defined($recursive)) { $recursive = 1; }
2629: my $bailout = shift;
2630: if (!defined($bailout)) { $bailout = 0; }
2631: my $showall = shift;
2632: # Create the necessary iterator.
2633: if (!ref($map)) { # assume it's a url of a map.
2634: $map = $self->getResourceByUrl($map);
2635: }
2636:
2637: # If nothing was passed, assume top-level map
2638: if (!$map) {
2639: $map = $self->getById('0.0');
2640: }
2641:
2642: # Check the map's validity.
2643: if (!$map->is_map()) {
2644: # Oh, to throw an exception.... how I'd love that!
2645: return ();
2646: }
2647:
2648: # Get an iterator.
2649: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2650: undef, $recursive, $showall);
2651:
2652: my @resources = ();
2653:
2654: if (&$filterFunc($map)) {
2655: push(@resources, $map);
2656: }
2657:
2658: # Run down the iterator and collect the resources.
2659: my $curRes;
2660:
2661: while ($curRes = $it->next()) {
2662: if (ref($curRes)) {
2663: if (!&$filterFunc($curRes)) {
2664: next;
2665: }
2666:
2667: push(@resources, $curRes);
2668:
2669: if ($bailout) {
2670: return @resources;
2671: }
2672: }
2673:
2674: }
2675:
2676: return @resources;
2677: }
2678:
2679: sub hasResource {
2680: my $self = shift;
2681: my $map = shift;
2682: my $filterFunc = shift;
2683: my $recursive = shift;
2684: my $showall = shift;
2685:
2686: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2687: }
2688:
2689: sub usedVersion {
2690: my $self = shift;
2691: my $linkurl = shift;
2692: return $self->navhash("version_$linkurl");
2693: }
2694:
2695: 1;
2696:
2697: package Apache::lonnavmaps::iterator;
2698: use Scalar::Util qw(weaken);
2699: use Apache::lonnet;
2700:
2701: =pod
2702:
2703: =back
2704:
2705: =head1 Object: navmap Iterator
2706:
2707: An I<iterator> encapsulates the logic required to traverse a data
2708: structure. navmap uses an iterator to traverse the course map
2709: according to the criteria you wish to use.
2710:
2711: To obtain an iterator, call the B<getIterator>() function of a
2712: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2713: directly.) This will return a reference to the iterator:
2714:
2715: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2716:
2717: To get the next thing from the iterator, call B<next>:
2718:
2719: C<my $nextThing = $resourceIterator-E<gt>next()>
2720:
2721: getIterator behaves as follows:
2722:
2723: =over 4
2724:
2725: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2726:
2727: All parameters are optional. firstResource is a resource reference
2728: corresponding to where the iterator should start. It defaults to
2729: navmap->firstResource() for the corresponding nav map. finishResource
2730: corresponds to where you want the iterator to end, defaulting to
2731: navmap->finishResource(). filterHash is a hash used as a set
2732: containing strings representing the resource IDs, defaulting to
2733: empty. Condition is a 1 or 0 that sets what to do with the filter
2734: hash: If a 0, then only resources that exist IN the filterHash will be
2735: recursed on. If it is a 1, only resources NOT in the filterHash will
2736: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2737: false (default), the iterator will only return the first level of map
2738: that is not just a single, 'redirecting' map. If true, the iterator
2739: will return all information, starting with the top-level map,
2740: regardless of content. returnTopMap, if true (default false), will
2741: cause the iterator to return the top-level map object (resource 0.0)
2742: before anything else.
2743:
2744: Thus, by default, only top-level resources will be shown. Change the
2745: condition to a 1 without changing the hash, and all resources will be
2746: shown. Changing the condition to 1 and including some values in the
2747: hash will allow you to selectively suppress parts of the navmap, while
2748: leaving it on 0 and adding things to the hash will allow you to
2749: selectively add parts of the nav map. See the handler code for
2750: examples.
2751:
2752: The iterator will return either a reference to a resource object, or a
2753: token representing something in the map, such as the beginning of a
2754: new branch. The possible tokens are:
2755:
2756: =over 4
2757:
2758: =item * B<END_ITERATOR>:
2759:
2760: The iterator has returned all that it's going to. Further calls to the
2761: iterator will just produce more of these. This is a "false" value, and
2762: is the only false value the iterator which will be returned, so it can
2763: be used as a loop sentinel.
2764:
2765: =item * B<BEGIN_MAP>:
2766:
2767: A new map is being recursed into. This is returned I<after> the map
2768: resource itself is returned.
2769:
2770: =item * B<END_MAP>:
2771:
2772: The map is now done.
2773:
2774: =item * B<BEGIN_BRANCH>:
2775:
2776: A branch is now starting. The next resource returned will be the first
2777: in that branch.
2778:
2779: =item * B<END_BRANCH>:
2780:
2781: The branch is now done.
2782:
2783: =back
2784:
2785: The tokens are retreivable via methods on the iterator object, i.e.,
2786: $iterator->END_MAP.
2787:
2788: Maps can contain empty resources. The iterator will automatically skip
2789: over such resources, but will still treat the structure
2790: correctly. Thus, a complicated map with several branches, but
2791: consisting entirely of empty resources except for one beginning or
2792: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2793: but only one resource will be returned.
2794:
2795: =back
2796:
2797: =head2 Normal Usage
2798:
2799: Normal usage of the iterator object is to do the following:
2800:
2801: my $it = $navmap->getIterator([your params here]);
2802: my $curRes;
2803: while ($curRes = $it->next()) {
2804: [your logic here]
2805: }
2806:
2807: Note that inside of the loop, it's frequently useful to check if
2808: "$curRes" is a reference or not with the reference function; only
2809: resource objects will be references, and any non-references will
2810: be the tokens described above.
2811:
2812: Also note there is some old code floating around that trys to track
2813: the depth of the iterator to see when it's done; do not copy that
2814: code. It is difficult to get right and harder to understand than
2815: this. They should be migrated to this new style.
2816:
2817: =cut
2818:
2819: # Here are the tokens for the iterator:
2820:
2821: sub END_ITERATOR { return 0; }
2822: sub BEGIN_MAP { return 1; } # begining of a new map
2823: sub END_MAP { return 2; } # end of the map
2824: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2825: sub END_BRANCH { return 4; } # end of a branch
2826: sub FORWARD { return 1; } # go forward
2827: sub BACKWARD { return 2; }
2828:
2829: sub min {
2830: (my $a, my $b) = @_;
2831: if ($a < $b) { return $a; } else { return $b; }
2832: }
2833:
2834: sub new {
2835: # magic invocation to create a class instance
2836: my $proto = shift;
2837: my $class = ref($proto) || $proto;
2838: my $self = {};
2839:
2840: weaken($self->{NAV_MAP} = shift);
2841: return undef unless ($self->{NAV_MAP});
2842:
2843: # Handle the parameters
2844: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2845: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2846:
2847: # If the given resources are just the ID of the resource, get the
2848: # objects
2849: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2850: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2851: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2852: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2853:
2854: $self->{FILTER} = shift;
2855:
2856: # A hash, used as a set, of resource already seen
2857: $self->{ALREADY_SEEN} = shift;
2858: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2859: $self->{CONDITION} = shift;
2860:
2861: # Do we want to automatically follow "redirection" maps?
2862: $self->{FORCE_TOP} = shift;
2863:
2864: # Do we want to return the top-level map object (resource 0.0)?
2865: $self->{RETURN_0} = shift;
2866: # have we done that yet?
2867: $self->{HAVE_RETURNED_0} = 0;
2868:
2869: # Now, we need to pre-process the map, by walking forward and backward
2870: # over the parts of the map we're going to look at.
2871:
2872: # The processing steps are exactly the same, except for a few small
2873: # changes, so I bundle those up in the following list of two elements:
2874: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2875: # first_resource).
2876: # This prevents writing nearly-identical code twice.
2877: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2878: 'FIRST_RESOURCE'],
2879: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2880: 'FINISH_RESOURCE'] );
2881:
2882: my $maxDepth = 0; # tracks max depth
2883:
2884: # If there is only one resource in this map, and it's a map, we
2885: # want to remember that, so the user can ask for the first map
2886: # that isn't just a redirector.
2887: my $resource; my $resourceCount = 0;
2888:
2889: # Documentation on this algorithm can be found in the CVS repository at
2890: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2891: # in that file.
2892: # **1**
2893:
2894: foreach my $pass (@iterations) {
2895: my $direction = $pass->[0];
2896: my $valName = $pass->[1];
2897: my $nextResourceMethod = $pass->[2];
2898: my $firstResourceName = $pass->[3];
2899:
2900: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2901: $self->{FIRST_RESOURCE},
2902: $self->{FINISH_RESOURCE},
2903: {}, undef, 0, $direction);
2904:
2905: # prime the recursion
2906: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2907: $iterator->next();
2908: my $curRes = $iterator->next();
2909: my $depth = 1;
2910: while ($depth > 0) {
2911: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2912: if ($curRes == $iterator->END_MAP()) { $depth--; }
2913:
2914: if (ref($curRes)) {
2915: # If there's only one resource, this will save it
2916: # we have to filter empty resources from consideration here,
2917: # or even "empty", redirecting maps have two (start & finish)
2918: # or three (start, finish, plus redirector)
2919: if($direction == FORWARD && $curRes->src()) {
2920: $resource = $curRes; $resourceCount++;
2921: }
2922: my $resultingVal = $curRes->{DATA}->{$valName};
2923: my $nextResources = $curRes->$nextResourceMethod();
2924: my $nextCount = scalar(@{$nextResources});
2925:
2926: if ($nextCount == 1) { # **3**
2927: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2928: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2929: }
2930:
2931: if ($nextCount > 1) { # **4**
2932: foreach my $res (@{$nextResources}) {
2933: my $current = $res->{DATA}->{$valName} || 999999999;
2934: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2935: }
2936: }
2937: }
2938:
2939: # Assign the final val (**2**)
2940: if (ref($curRes) && $direction == BACKWARD()) {
2941: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2942: $curRes->{DATA}->{BOT_UP_VAL});
2943:
2944: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2945: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2946: }
2947:
2948: $curRes = $iterator->next();
2949: }
2950: }
2951:
2952: # Check: Was this only one resource, a map?
2953: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2954: my $firstResource = $resource->map_start();
2955: my $finishResource = $resource->map_finish();
2956: return
2957: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2958: $finishResource, $self->{FILTER},
2959: $self->{ALREADY_SEEN},
2960: $self->{CONDITION},
2961: $self->{FORCE_TOP});
2962:
2963: }
2964:
2965: # Set up some bookkeeping information.
2966: $self->{CURRENT_DEPTH} = 0;
2967: $self->{MAX_DEPTH} = $maxDepth;
2968: $self->{STACK} = [];
2969: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2970: $self->{FINISHED} = 0; # When true, the iterator has finished
2971:
2972: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2973: push @{$self->{STACK}}, [];
2974: }
2975:
2976: # Prime the recursion w/ the first resource **5**
2977: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2978: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2979:
2980: bless ($self);
2981:
2982: return $self;
2983: }
2984:
2985: sub next {
2986: my $self = shift;
2987: my $closeAllPages=shift;
2988: if ($self->{FINISHED}) {
2989: return END_ITERATOR();
2990: }
2991:
2992: # If we want to return the top-level map object, and haven't yet,
2993: # do so.
2994: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2995: $self->{HAVE_RETURNED_0} = 1;
2996: return $self->{NAV_MAP}->getById('0.0');
2997: }
2998: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
2999: $self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
3000: return $self->BEGIN_MAP();
3001: }
3002:
3003: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3004: # grab the next from the recursive iterator
3005: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3006:
3007: # is it a begin or end map? If so, update the depth
3008: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3009: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3010:
3011: # Are we back at depth 0? If so, stop recursing
3012: if ($self->{RECURSIVE_DEPTH} == 0) {
3013: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3014: }
3015:
3016: return $next;
3017: }
3018:
3019: if (defined($self->{FORCE_NEXT})) {
3020: my $tmp = $self->{FORCE_NEXT};
3021: $self->{FORCE_NEXT} = undef;
3022: return $tmp;
3023: }
3024:
3025: # Have we not yet begun? If not, return BEGIN_MAP and
3026: # remember we've started.
3027: if ( !$self->{STARTED} ) {
3028: $self->{STARTED} = 1;
3029: return $self->BEGIN_MAP();
3030: }
3031:
3032: # Here's the guts of the iterator.
3033:
3034: # Find the next resource, if any.
3035: my $found = 0;
3036: my $i = $self->{MAX_DEPTH};
3037: my $newDepth;
3038: my $here;
3039: while ( $i >= 0 && !$found ) {
3040: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3041: $here = pop @{$self->{STACK}->[$i]}; # **7**
3042: $found = 1;
3043: $newDepth = $i;
3044: }
3045: $i--;
3046: }
3047:
3048: # If we still didn't find anything, we're done.
3049: if ( !$found ) {
3050: # We need to get back down to the correct branch depth
3051: if ( $self->{CURRENT_DEPTH} > 0 ) {
3052: $self->{CURRENT_DEPTH}--;
3053: return END_BRANCH();
3054: } else {
3055: $self->{FINISHED} = 1;
3056: return END_MAP();
3057: }
3058: }
3059:
3060: # If this is not a resource, it must be an END_BRANCH marker we want
3061: # to return directly.
3062: if (!ref($here)) { # **8**
3063: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3064: $self->{CURRENT_DEPTH}--;
3065: return $here;
3066: }
3067: }
3068:
3069: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3070: $self->{HERE} = $here;
3071:
3072: # Get to the right level
3073: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3074: push @{$self->{STACK}->[$newDepth]}, $here;
3075: $self->{CURRENT_DEPTH}--;
3076: return END_BRANCH();
3077: }
3078: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3079: push @{$self->{STACK}->[$newDepth]}, $here;
3080: $self->{CURRENT_DEPTH}++;
3081: return BEGIN_BRANCH();
3082: }
3083:
3084: # If we made it here, we have the next resource, and we're at the
3085: # right branch level. So let's examine the resource for where
3086: # we can get to from here.
3087:
3088: # So we need to look at all the resources we can get to from here,
3089: # categorize them if we haven't seen them, remember if we have a new
3090: my $nextUnfiltered = $here->getNext();
3091: my $maxDepthAdded = -1;
3092:
3093: for (@$nextUnfiltered) {
3094: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3095: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3096: push @{$self->{STACK}->[$depth]}, $_;
3097: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3098: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3099: }
3100: }
3101:
3102: # Is this the end of a branch? If so, all of the resources examined above
3103: # led to lower levels than the one we are currently at, so we push a END_BRANCH
3104: # marker onto the stack so we don't forget.
3105: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3106: # BC branch and gets to C, it will see F as the only next resource, but it's
3107: # one level lower. Thus, this is the end of the branch, since there are no
3108: # more resources added to this level or above.
3109: # We don't do this if the examined resource is the finish resource,
3110: # because the condition given above is true, but the "END_MAP" will
3111: # take care of things and we should already be at depth 0.
3112: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3113: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3114: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3115: }
3116:
3117: # That ends the main iterator logic. Now, do we want to recurse
3118: # down this map (if this resource is a map)?
3119: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3120: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3121: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3122: my $firstResource = $self->{HERE}->map_start();
3123: my $finishResource = $self->{HERE}->map_finish();
3124:
3125: $self->{RECURSIVE_ITERATOR} =
3126: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3127: $finishResource, $self->{FILTER},
3128: $self->{ALREADY_SEEN},
3129: $self->{CONDITION},
3130: $self->{FORCE_TOP});
3131: }
3132:
3133: # If this is a blank resource, don't actually return it.
3134: # Should you ever find you need it, make sure to add an option to the code
3135: # that you can use; other things depend on this behavior.
3136: my $browsePriv = $self->{HERE}->browsePriv();
3137: if (!$self->{HERE}->src() ||
3138: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3139: return $self->next($closeAllPages);
3140: }
3141:
3142: return $self->{HERE};
3143:
3144: }
3145:
3146: =pod
3147:
3148: The other method available on the iterator is B<getStack>, which
3149: returns an array populated with the current 'stack' of maps, as
3150: references to the resource objects. Example: This is useful when
3151: making the navigation map, as we need to check whether we are under a
3152: page map to see if we need to link directly to the resource, or to the
3153: page. The first elements in the array will correspond to the top of
3154: the stack (most inclusive map).
3155:
3156: =cut
3157:
3158: sub getStack {
3159: my $self=shift;
3160:
3161: my @stack;
3162:
3163: $self->populateStack(\@stack);
3164:
3165: return \@stack;
3166: }
3167:
3168: # Private method: Calls the iterators recursively to populate the stack.
3169: sub populateStack {
3170: my $self=shift;
3171: my $stack = shift;
3172:
3173: push @$stack, $self->{HERE} if ($self->{HERE});
3174:
3175: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3176: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3177: }
3178: }
3179:
3180: 1;
3181:
3182: package Apache::lonnavmaps::DFSiterator;
3183: use Scalar::Util qw(weaken);
3184: use Apache::lonnet;
3185:
3186: # Not documented in the perldoc: This is a simple iterator that just walks
3187: # through the nav map and presents the resources in a depth-first search
3188: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3189: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3190: # useful for pre-processing of some kind, and is in fact used by the main
3191: # iterator that way, but that's about it.
3192: # One could imagine merging this into the init routine of the main iterator,
3193: # but this might as well be left separate, since it is possible some other
3194: # use might be found for it. - Jeremy
3195:
3196: # Unlike the main iterator, this DOES return all resources, even blank ones.
3197: # The main iterator needs them to correctly preprocess the map.
3198:
3199: sub BEGIN_MAP { return 1; } # begining of a new map
3200: sub END_MAP { return 2; } # end of the map
3201: sub FORWARD { return 1; } # go forward
3202: sub BACKWARD { return 2; }
3203:
3204: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3205: # filter hash ref (or undef), already seen hash or undef, condition
3206: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3207: sub new {
3208: # magic invocation to create a class instance
3209: my $proto = shift;
3210: my $class = ref($proto) || $proto;
3211: my $self = {};
3212:
3213: weaken($self->{NAV_MAP} = shift);
3214: return undef unless ($self->{NAV_MAP});
3215:
3216: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3217: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3218:
3219: # If the given resources are just the ID of the resource, get the
3220: # objects
3221: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3222: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3223: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3224: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3225:
3226: $self->{FILTER} = shift;
3227:
3228: # A hash, used as a set, of resource already seen
3229: $self->{ALREADY_SEEN} = shift;
3230: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3231: $self->{CONDITION} = shift;
3232: $self->{DIRECTION} = shift || FORWARD();
3233:
3234: # Flag: Have we started yet?
3235: $self->{STARTED} = 0;
3236:
3237: # Should we continue calling the recursive iterator, if any?
3238: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3239: # The recursive iterator, if any
3240: $self->{RECURSIVE_ITERATOR} = undef;
3241: # Are we recursing on a map, or a branch?
3242: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3243: # And the count of how deep it is, so that this iterator can keep track of
3244: # when to pick back up again.
3245: $self->{RECURSIVE_DEPTH} = 0;
3246:
3247: # For keeping track of our branches, we maintain our own stack
3248: $self->{STACK} = [];
3249:
3250: # Start with the first resource
3251: if ($self->{DIRECTION} == FORWARD) {
3252: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3253: } else {
3254: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3255: }
3256:
3257: bless($self);
3258: return $self;
3259: }
3260:
3261: sub next {
3262: my $self = shift;
3263:
3264: # Are we using a recursive iterator? If so, pull from that and
3265: # watch the depth; we want to resume our level at the correct time.
3266: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3267: # grab the next from the recursive iterator
3268: my $next = $self->{RECURSIVE_ITERATOR}->next();
3269:
3270: # is it a begin or end map? Update depth if so
3271: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3272: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3273:
3274: # Are we back at depth 0? If so, stop recursing.
3275: if ($self->{RECURSIVE_DEPTH} == 0) {
3276: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3277: }
3278:
3279: return $next;
3280: }
3281:
3282: # Is there a current resource to grab? If not, then return
3283: # END_MAP, which will end the iterator.
3284: if (scalar(@{$self->{STACK}}) == 0) {
3285: return $self->END_MAP();
3286: }
3287:
3288: # Have we not yet begun? If not, return BEGIN_MAP and
3289: # remember that we've started.
3290: if ( !$self->{STARTED} ) {
3291: $self->{STARTED} = 1;
3292: return $self->BEGIN_MAP;
3293: }
3294:
3295: # Get the next resource in the branch
3296: $self->{HERE} = pop @{$self->{STACK}};
3297:
3298: # remember that we've seen this, so we don't return it again later
3299: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3300:
3301: # Get the next possible resources
3302: my $nextUnfiltered;
3303: if ($self->{DIRECTION} == FORWARD()) {
3304: $nextUnfiltered = $self->{HERE}->getNext();
3305: } else {
3306: $nextUnfiltered = $self->{HERE}->getPrevious();
3307: }
3308: my $next = [];
3309:
3310: # filter the next possibilities to remove things we've
3311: # already seen.
3312: foreach my $item (@$nextUnfiltered) {
3313: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3314: push @$next, $item;
3315: }
3316: }
3317:
3318: while (@$next) {
3319: # copy the next possibilities over to the stack
3320: push @{$self->{STACK}}, shift @$next;
3321: }
3322:
3323: # If this is a map and we want to recurse down it... (not filtered out)
3324: if ($self->{HERE}->is_map() &&
3325: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3326: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3327: my $firstResource = $self->{HERE}->map_start();
3328: my $finishResource = $self->{HERE}->map_finish();
3329:
3330: $self->{RECURSIVE_ITERATOR} =
3331: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3332: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3333: $self->{CONDITION}, $self->{DIRECTION});
3334: }
3335:
3336: return $self->{HERE};
3337: }
3338:
3339: # Identical to the full iterator methods of the same name. Hate to copy/paste
3340: # but I also hate to "inherit" either iterator from the other.
3341:
3342: sub getStack {
3343: my $self=shift;
3344:
3345: my @stack;
3346:
3347: $self->populateStack(\@stack);
3348:
3349: return \@stack;
3350: }
3351:
3352: # Private method: Calls the iterators recursively to populate the stack.
3353: sub populateStack {
3354: my $self=shift;
3355: my $stack = shift;
3356:
3357: push @$stack, $self->{HERE} if ($self->{HERE});
3358:
3359: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3360: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3361: }
3362: }
3363:
3364: 1;
3365:
3366: package Apache::lonnavmaps::resource;
3367: use Scalar::Util qw(weaken);
3368: use Apache::lonnet;
3369:
3370: =pod
3371:
3372: =head1 Object: resource
3373:
3374: X<resource, navmap object>
3375: A resource object encapsulates a resource in a resource map, allowing
3376: easy manipulation of the resource, querying the properties of the
3377: resource (including user properties), and represents a reference that
3378: can be used as the canonical representation of the resource by
3379: lonnavmap clients like renderers.
3380:
3381: A resource only makes sense in the context of a navmap, as some of the
3382: data is stored in the navmap object.
3383:
3384: You will probably never need to instantiate this object directly. Use
3385: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3386: starting resource.
3387:
3388: Resource objects respect the parameter_hiddenparts, which suppresses
3389: various parts according to the wishes of the map author. As of this
3390: writing, there is no way to override this parameter, and suppressed
3391: parts will never be returned, nor will their response types or ids be
3392: stored.
3393:
3394: =head2 Overview
3395:
3396: A B<Resource> is the most granular type of object in LON-CAPA that can
3397: be included in a course. It can either be a particular resource, like
3398: an HTML page, external resource, problem, etc., or it can be a
3399: container sequence, such as a "page" or a "map".
3400:
3401: To see a sequence from the user's point of view, please see the
3402: B<Creating a Course: Maps and Sequences> chapter of the Author's
3403: Manual.
3404:
3405: A Resource Object, once obtained from a navmap object via a B<getBy*>
3406: method of the navmap, or from an iterator, allows you to query
3407: information about that resource.
3408:
3409: Generally, you do not ever want to create a resource object yourself,
3410: so creation has been left undocumented. Always retrieve resources
3411: from navmap objects.
3412:
3413: =head3 Identifying Resources
3414:
3415: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3416: unique to that resource for a given course. X<resource ID, in big hash>
3417: The Resource ID has the form #.#, where the first number is the same
3418: for every resource in a map, and the second is unique. For instance,
3419: for a course laid out like this:
3420:
3421: * Problem 1
3422: * Map
3423: * Resource 2
3424: * Resource 3
3425:
3426: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3427: C<Resource 3> will share a first number. The second number may end up
3428: re-used between the two groups.
3429:
3430: The resource ID is only used in the big hash, but can be used in the
3431: context of a course to identify a resource easily. (For instance, the
3432: printing system uses it to record which resources from a sequence you
3433: wish to print.)
3434:
3435: X<symb> X<resource, symb>
3436: All resources also have B<symb>s, which uniquely identify a resource
3437: in a course. Many internal LON-CAPA functions expect a symb. A symb
3438: carries along with it the URL of the resource, and the map it appears
3439: in. Symbs are much larger than resource IDs.
3440:
3441: =cut
3442:
3443: sub new {
3444: # magic invocation to create a class instance
3445: my $proto = shift;
3446: my $class = ref($proto) || $proto;
3447: my $self = {};
3448:
3449: weaken($self->{NAV_MAP} = shift);
3450: $self->{ID} = shift;
3451:
3452: # Store this new resource in the parent nav map's cache.
3453: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3454: $self->{RESOURCE_ERROR} = 0;
3455:
3456: # A hash that can be used by two-pass algorithms to store data
3457: # about this resource in. Not used by the resource object
3458: # directly.
3459: $self->{DATA} = {};
3460:
3461: bless($self);
3462:
3463: return $self;
3464: }
3465:
3466: # private function: simplify the NAV_HASH lookups we keep doing
3467: # pass the name, and to automatically append my ID, pass a true val on the
3468: # second param
3469: sub navHash {
3470: my $self = shift;
3471: my $param = shift;
3472: my $id = shift;
3473: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3474: }
3475:
3476: =pod
3477:
3478: =head2 Methods
3479:
3480: Once you have a resource object, here's what you can do with it:
3481:
3482: =head3 Attribute Retrieval
3483:
3484: Every resource has certain attributes that can be retrieved and used:
3485:
3486: =over 4
3487:
3488: =item * B<ID>: Every resource has an ID that is unique for that
3489: resource in the course it is in. The ID is actually in the hash
3490: representing the resource, so for a resource object $res, obtain
3491: it via C<$res->{ID}).
3492:
3493: =item * B<compTitle>:
3494:
3495: Returns a "composite title", that is equal to $res->title() if the
3496: resource has a title, and is otherwise the last part of the URL (e.g.,
3497: "problem.problem").
3498:
3499: =item * B<ext>:
3500:
3501: Returns true if the resource is external.
3502:
3503: =item * B<kind>:
3504:
3505: Returns the kind of the resource from the compiled nav map.
3506:
3507: =item * B<randomout>:
3508:
3509: Returns true if this resource was chosen to NOT be shown to the user
3510: by the random map selection feature. In other words, this is usually
3511: false.
3512:
3513: =item * B<randompick>:
3514:
3515: Returns the number of randomly picked items for a map if the randompick
3516: feature is being used on the map.
3517:
3518: =item * B<randomorder>:
3519:
3520: Returns true for a map if the randomorder feature is being used on the
3521: map.
3522:
3523: =item * B<src>:
3524:
3525: Returns the source for the resource.
3526:
3527: =item * B<symb>:
3528:
3529: Returns the symb for the resource.
3530:
3531: =item * B<title>:
3532:
3533: Returns the title of the resource.
3534:
3535: =back
3536:
3537: =cut
3538:
3539: # These info functions can be used directly, as they don't return
3540: # resource information.
3541: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3542: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3543: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3544: sub from { my $self=shift; return $self->navHash("from_", 1); }
3545: # considered private and undocumented
3546: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3547: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3548: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3549: sub randompick {
3550: my $self = shift;
3551: my $randompick = $self->parmval('randompick');
3552: return $randompick;
3553: }
3554: sub randomorder {
3555: my $self = shift;
3556: my $randomorder = $self->parmval('randomorder');
3557: return ($randomorder =~ /^yes$/i);
3558: }
3559: sub link {
3560: my $self=shift;
3561: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3562: return $self->src;
3563: }
3564: sub src {
3565: my $self=shift;
3566: return $self->navHash("src_", 1);
3567: }
3568: sub shown_symb {
3569: my $self=shift;
3570: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3571: return $self->symb();
3572: }
3573: sub id {
3574: my $self=shift;
3575: return $self->{ID};
3576: }
3577: sub enclosing_map_src {
3578: my $self=shift;
3579: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3580: return $self->navHash('map_id_'.$first);
3581: }
3582: sub symb {
3583: my $self=shift;
3584: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3585: my $symbSrc = &Apache::lonnet::declutter($self->src());
3586: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3587: . '___' . $second . '___' . $symbSrc;
3588: return &Apache::lonnet::symbclean($symb);
3589: }
3590: sub wrap_symb {
3591: my $self = shift;
3592: return $self->{NAV_MAP}->wrap_symb($self->symb());
3593: }
3594: sub title {
3595: my $self=shift;
3596: if ($self->{ID} eq '0.0') {
3597: # If this is the top-level map, return the title of the course
3598: # since this map can not be titled otherwise.
3599: return $env{'course.'.$env{'request.course.id'}.'.description'};
3600: }
3601: return $self->navHash("title_", 1); }
3602: # considered private and undocumented
3603: sub to { my $self=shift; return $self->navHash("to_", 1); }
3604: sub condition {
3605: my $self=shift;
3606: my $undercond=$self->navHash("undercond_", 1);
3607: if (!defined($undercond)) { return 1; };
3608: my $condid=$self->navHash("condid_$undercond");
3609: if (!defined($condid)) { return 1; };
3610: my $condition=&Apache::lonnet::directcondval($condid);
3611: return $condition;
3612: }
3613: sub condval {
3614: my $self=shift;
3615: my ($pathname,$filename) =
3616: &Apache::lonnet::split_uri_for_cond($self->src());
3617:
3618: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3619: /\&\Q$filename\E\:([\d\|]+)\&/);
3620: if ($match) {
3621: return &Apache::lonnet::condval($1);
3622: }
3623: return 0;
3624: }
3625: sub compTitle {
3626: my $self = shift;
3627: my $title = $self->title();
3628: $title=~s/\&colon\;/\:/gs;
3629: if (!$title) {
3630: $title = $self->src();
3631: $title = substr($title, rindex($title, '/') + 1);
3632: }
3633: return $title;
3634: }
3635:
3636: =pod
3637:
3638: B<Predicate Testing the Resource>
3639:
3640: These methods are shortcuts to deciding if a given resource has a given property.
3641:
3642: =over 4
3643:
3644: =item * B<is_map>:
3645:
3646: Returns true if the resource is a map type.
3647:
3648: =item * B<is_problem>:
3649:
3650: Returns true if the resource is a problem type, false
3651: otherwise. (Looks at the extension on the src field; might need more
3652: to work correctly.)
3653:
3654: =item * B<is_page>:
3655:
3656: Returns true if the resource is a page.
3657:
3658: =item * B<is_sequence>:
3659:
3660: Returns true if the resource is a sequence.
3661:
3662: =back
3663:
3664: =cut
3665:
3666: sub hasResource {
3667: my $self = shift;
3668: return $self->{NAV_MAP}->hasResource(@_);
3669: }
3670:
3671: sub retrieveResources {
3672: my $self = shift;
3673: return $self->{NAV_MAP}->retrieveResources(@_);
3674: }
3675:
3676: sub is_exam {
3677: my ($self,$part) = @_;
3678: my $type = $self->parmval('type',$part);
3679: if ($type eq 'exam') {
3680: return 1;
3681: }
3682: if ($self->src() =~ /\.(exam)$/) {
3683: return 1;
3684: }
3685: return 0;
3686: }
3687: sub is_html {
3688: my $self=shift;
3689: my $src = $self->src();
3690: return ($src =~ /html$/);
3691: }
3692: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3693: sub is_page {
3694: my $self=shift;
3695: my $src = $self->src();
3696: return $self->navHash("is_map_", 1) &&
3697: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3698: }
3699: sub is_practice {
3700: my $self=shift;
3701: my ($part) = @_;
3702: my $type = $self->parmval('type',$part);
3703: if ($type eq 'practice') {
3704: return 1;
3705: }
3706: return 0;
3707: }
3708: sub is_problem {
3709: my $self=shift;
3710: my $src = $self->src();
3711: if ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/) {
3712: return !($self->is_practice());
3713: }
3714: return 0;
3715: }
3716: sub is_raw_problem {
3717: my $self=shift;
3718: my $src = $self->src();
3719: if ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/) {
3720: return 1;
3721: }
3722: return 0;
3723: }
3724:
3725: sub contains_problem {
3726: my $self=shift;
3727: if ($self->is_page()) {
3728: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3729: return $hasProblem;
3730: }
3731: return 0;
3732: }
3733: sub map_contains_problem {
3734: my $self=shift;
3735: if ($self->is_map()) {
3736: my $has_problem=
3737: $self->hasResource($self,sub { $_[0]->is_problem() },1);
3738: return $has_problem;
3739: }
3740: return 0;
3741: }
3742: sub is_sequence {
3743: my $self=shift;
3744: return $self->navHash("is_map_", 1) &&
3745: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3746: }
3747: sub is_survey {
3748: my $self = shift();
3749: my $part = shift();
3750: my $type = $self->parmval('type',$part);
3751: if ($type eq 'survey') {
3752: return 1;
3753: }
3754: if ($self->src() =~ /\.(survey)$/) {
3755: return 1;
3756: }
3757: return 0;
3758: }
3759: sub is_task {
3760: my $self=shift;
3761: my $src = $self->src();
3762: return ($src =~ /\.(task)$/)
3763: }
3764:
3765: sub is_empty_sequence {
3766: my $self=shift;
3767: my $src = $self->src();
3768: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3769: }
3770:
3771: # Private method: Shells out to the parmval in the nav map, handler parts.
3772: sub parmval {
3773: my $self = shift;
3774: my $what = shift;
3775: my $part = shift;
3776: if (!defined($part)) {
3777: $part = '0';
3778: }
3779: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3780: }
3781:
3782: =pod
3783:
3784: B<Map Methods>
3785:
3786: These methods are useful for getting information about the map
3787: properties of the resource, if the resource is a map (B<is_map>).
3788:
3789: =over 4
3790:
3791: =item * B<map_finish>:
3792:
3793: Returns a reference to a resource object corresponding to the finish
3794: resource of the map.
3795:
3796: =item * B<map_pc>:
3797:
3798: Returns the pc value of the map, which is the first number that
3799: appears in the resource ID of the resources in the map, and is the
3800: number that appears around the middle of the symbs of the resources in
3801: that map.
3802:
3803: =item * B<map_start>:
3804:
3805: Returns a reference to a resource object corresponding to the start
3806: resource of the map.
3807:
3808: =item * B<map_type>:
3809:
3810: Returns a string with the type of the map in it.
3811:
3812: =back
3813:
3814: =cut
3815:
3816: sub map_finish {
3817: my $self = shift;
3818: my $src = $self->src();
3819: $src = &Apache::lonnet::clutter($src);
3820: my $res = $self->navHash("map_finish_$src", 0);
3821: $res = $self->{NAV_MAP}->getById($res);
3822: return $res;
3823: }
3824: sub map_pc {
3825: my $self = shift;
3826: my $src = $self->src();
3827: return $self->navHash("map_pc_$src", 0);
3828: }
3829: sub map_start {
3830: my $self = shift;
3831: my $src = $self->src();
3832: $src = &Apache::lonnet::clutter($src);
3833: my $res = $self->navHash("map_start_$src", 0);
3834: $res = $self->{NAV_MAP}->getById($res);
3835: return $res;
3836: }
3837: sub map_type {
3838: my $self = shift;
3839: my $pc = $self->map_pc();
3840: return $self->navHash("map_type_$pc", 0);
3841: }
3842:
3843: #####
3844: # Property queries
3845: #####
3846:
3847: # These functions will be responsible for returning the CORRECT
3848: # VALUE for the parameter, no matter what. So while they may look
3849: # like direct calls to parmval, they can be more than that.
3850: # So, for instance, the duedate function should use the "duedatetype"
3851: # information, rather than the resource object user.
3852:
3853: =pod
3854:
3855: =head2 Resource Parameters
3856:
3857: In order to use the resource parameters correctly, the nav map must
3858: have been instantiated with genCourseAndUserOptions set to true, so
3859: the courseopt and useropt is read correctly. Then, you can call these
3860: functions to get the relevant parameters for the resource. Each
3861: function defaults to part "0", but can be directed to another part by
3862: passing the part as the parameter.
3863:
3864: These methods are responsible for getting the parameter correct, not
3865: merely reflecting the contents of the GDBM hashes. As we move towards
3866: dates relative to other dates, these methods should be updated to
3867: reflect that. (Then, anybody using these methods will not have to update
3868: their code.)
3869:
3870: =over 4
3871:
3872: =item * B<acc>:
3873:
3874: Get the Client IP/Name Access Control information.
3875:
3876: =item * B<answerdate>:
3877:
3878: Get the answer-reveal date for the problem.
3879:
3880: =item * B<awarded>:
3881:
3882: Gets the awarded value for the problem part. Requires genUserData set to
3883: true when the navmap object was created.
3884:
3885: =item * B<duedate>:
3886:
3887: Get the due date for the problem.
3888:
3889: =item * B<tries>:
3890:
3891: Get the number of tries the student has used on the problem.
3892:
3893: =item * B<maxtries>:
3894:
3895: Get the number of max tries allowed.
3896:
3897: =item * B<opendate>:
3898:
3899: Get the open date for the problem.
3900:
3901: =item * B<sig>:
3902:
3903: Get the significant figures setting.
3904:
3905: =item * B<tol>:
3906:
3907: Get the tolerance for the problem.
3908:
3909: =item * B<tries>:
3910:
3911: Get the number of tries the user has already used on the problem.
3912:
3913: =item * B<type>:
3914:
3915: Get the question type for the problem.
3916:
3917: =item * B<weight>:
3918:
3919: Get the weight for the problem.
3920:
3921: =back
3922:
3923: =cut
3924:
3925: sub acc {
3926: (my $self, my $part) = @_;
3927: my $acc = $self->parmval("acc", $part);
3928: return $acc;
3929: }
3930: sub answerdate {
3931: (my $self, my $part) = @_;
3932: # Handle intervals
3933: my $answerdatetype = $self->parmval("answerdate.type", $part);
3934: my $answerdate = $self->parmval("answerdate", $part);
3935: my $duedate = $self->parmval("duedate", $part);
3936: if ($answerdatetype eq 'date_interval') {
3937: $answerdate = $duedate + $answerdate;
3938: }
3939: return $answerdate;
3940: }
3941: sub awarded {
3942: my $self = shift; my $part = shift;
3943: $self->{NAV_MAP}->get_user_data();
3944: if (!defined($part)) { $part = '0'; }
3945: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3946: }
3947: # this should work exactly like the copy in lonhomework.pm
3948: sub duedate {
3949: (my $self, my $part) = @_;
3950: my $date;
3951: my @interval=$self->parmval("interval", $part);
3952: my $due_date=$self->parmval("duedate", $part);
3953: if ($interval[0] =~ /\d+/) {
3954: my $first_access=&Apache::lonnet::get_first_access($interval[1],
3955: $self->symb);
3956: if (defined($first_access)) {
3957: my $interval = $first_access+$interval[0];
3958: $date = (!$due_date || $interval < $due_date) ? $interval
3959: : $due_date;
3960: } else {
3961: $date = $due_date;
3962: }
3963: } else {
3964: $date = $due_date;
3965: }
3966: return $date;
3967: }
3968: sub handgrade {
3969: (my $self, my $part) = @_;
3970: my @response_ids = $self->responseIds($part);
3971: if (@response_ids) {
3972: foreach my $response_id (@response_ids) {
3973: my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
3974: if (lc($handgrade) eq 'yes') {
3975: return 'yes';
3976: }
3977: }
3978: }
3979: my $handgrade = $self->parmval("handgrade", $part);
3980: return $handgrade;
3981: }
3982: sub maxtries {
3983: (my $self, my $part) = @_;
3984: my $maxtries = $self->parmval("maxtries", $part);
3985: return $maxtries;
3986: }
3987: sub opendate {
3988: (my $self, my $part) = @_;
3989: my $opendatetype = $self->parmval("opendate.type", $part);
3990: my $opendate = $self->parmval("opendate", $part);
3991: if ($opendatetype eq 'date_interval') {
3992: my $duedate = $self->duedate($part);
3993: $opendate = $duedate - $opendate;
3994: }
3995: return $opendate;
3996: }
3997: sub problemstatus {
3998: (my $self, my $part) = @_;
3999: my $problemstatus = $self->parmval("problemstatus", $part);
4000: return lc($problemstatus);
4001: }
4002: sub sig {
4003: (my $self, my $part) = @_;
4004: my $sig = $self->parmval("sig", $part);
4005: return $sig;
4006: }
4007: sub tol {
4008: (my $self, my $part) = @_;
4009: my $tol = $self->parmval("tol", $part);
4010: return $tol;
4011: }
4012: sub tries {
4013: my $self = shift;
4014: my $tries = $self->queryRestoreHash('tries', shift);
4015: if (!defined($tries)) { return '0';}
4016: return $tries;
4017: }
4018: sub type {
4019: (my $self, my $part) = @_;
4020: my $type = $self->parmval("type", $part);
4021: return $type;
4022: }
4023: sub weight {
4024: my $self = shift; my $part = shift;
4025: if (!defined($part)) { $part = '0'; }
4026: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
4027: $self->symb(), $env{'user.domain'},
4028: $env{'user.name'},
4029: $env{'request.course.sec'});
4030: return $weight;
4031: }
4032: sub part_display {
4033: my $self= shift(); my $partID = shift();
4034: if (! defined($partID)) { $partID = '0'; }
4035: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
4036: $self->symb);
4037: if (! defined($display) || $display eq '') {
4038: $display = $partID;
4039: }
4040: return $display;
4041: }
4042:
4043: # Multiple things need this
4044: sub getReturnHash {
4045: my $self = shift;
4046:
4047: if (!defined($self->{RETURN_HASH})) {
4048: my %tmpHash = &Apache::lonnet::restore($self->symb());
4049: $self->{RETURN_HASH} = \%tmpHash;
4050: }
4051: }
4052:
4053: ######
4054: # Status queries
4055: ######
4056:
4057: # These methods query the status of problems.
4058:
4059: # If we need to count parts, this function determines the number of
4060: # parts from the metadata. When called, it returns a reference to a list
4061: # of strings corresponding to the parts. (Thus, using it in a scalar context
4062: # tells you how many parts you have in the problem:
4063: # $partcount = scalar($resource->countParts());
4064: # Don't use $self->{PARTS} directly because you don't know if it's been
4065: # computed yet.
4066:
4067: =pod
4068:
4069: =head2 Resource misc
4070:
4071: Misc. functions for the resource.
4072:
4073: =over 4
4074:
4075: =item * B<hasDiscussion>:
4076:
4077: Returns a false value if there has been discussion since the user last
4078: logged in, true if there has. Always returns false if the discussion
4079: data was not extracted when the nav map was constructed.
4080:
4081: =item * B<last_post_time>:
4082:
4083: Returns a false value if there hasn't been discussion otherwise returns
4084: unix timestamp of last time a discussion posting (or edit) was made.
4085:
4086: =item * B<discussion_info>:
4087:
4088: optional argument is a filter (currently can be 'unread');
4089: returns in scalar context the count of the number of discussion postings.
4090:
4091: returns in list context both the count of postings and a hash ref
4092: containing information about the postings (subject, id, timestamp) in a hash.
4093:
4094: 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.
4095:
4096: =item * B<getFeedback>:
4097:
4098: Gets the feedback for the resource and returns the raw feedback string
4099: for the resource, or the null string if there is no feedback or the
4100: email data was not extracted when the nav map was constructed. Usually
4101: used like this:
4102:
4103: for my $url (split(/\,/, $res->getFeedback())) {
4104: my $link = &escape($url);
4105: ...
4106:
4107: and use the link as appropriate.
4108:
4109: =cut
4110:
4111: sub hasDiscussion {
4112: my $self = shift;
4113: return $self->{NAV_MAP}->hasDiscussion($self->symb());
4114: }
4115:
4116: sub last_post_time {
4117: my $self = shift;
4118: return $self->{NAV_MAP}->last_post_time($self->symb());
4119: }
4120:
4121: sub discussion_info {
4122: my ($self,$filter) = @_;
4123: return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
4124: }
4125:
4126: sub getFeedback {
4127: my $self = shift;
4128: my $source = $self->src();
4129: my $symb = $self->symb();
4130: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4131: return $self->{NAV_MAP}->getFeedback($symb,$source);
4132: }
4133:
4134: sub getErrors {
4135: my $self = shift;
4136: my $source = $self->src();
4137: my $symb = $self->symb();
4138: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4139: return $self->{NAV_MAP}->getErrors($symb,$source);
4140: }
4141:
4142: =pod
4143:
4144: =item * B<parts>():
4145:
4146: Returns a list reference containing sorted strings corresponding to
4147: each part of the problem. Single part problems have only a part '0'.
4148: Multipart problems do not return their part '0', since they typically
4149: do not really matter.
4150:
4151: =item * B<countParts>():
4152:
4153: Returns the number of parts of the problem a student can answer. Thus,
4154: for single part problems, returns 1. For multipart, it returns the
4155: number of parts in the problem, not including psuedo-part 0.
4156:
4157: =item * B<countResponses>():
4158:
4159: Returns the total number of responses in the problem a student can answer.
4160:
4161: =item * B<responseTypes>():
4162:
4163: Returns a hash whose keys are the response types. The values are the number
4164: of times each response type is used. This is for the I<entire> problem, not
4165: just a single part.
4166:
4167: =item * B<multipart>():
4168:
4169: Returns true if the problem is multipart, false otherwise. Use this instead
4170: of countParts if all you want is multipart/not multipart.
4171:
4172: =item * B<responseType>($part):
4173:
4174: Returns the response type of the part, without the word "response" on the
4175: end. Example return values: 'string', 'essay', 'numeric', etc.
4176:
4177: =item * B<responseIds>($part):
4178:
4179: Retreives the response IDs for the given part as an array reference containing
4180: strings naming the response IDs. This may be empty.
4181:
4182: =back
4183:
4184: =cut
4185:
4186: sub parts {
4187: my $self = shift;
4188:
4189: if ($self->ext) { return []; }
4190:
4191: $self->extractParts();
4192: return $self->{PARTS};
4193: }
4194:
4195: sub countParts {
4196: my $self = shift;
4197:
4198: my $parts = $self->parts();
4199:
4200: # If I left this here, then it's not necessary.
4201: #my $delta = 0;
4202: #for my $part (@$parts) {
4203: # if ($part eq '0') { $delta--; }
4204: #}
4205:
4206: if ($self->{RESOURCE_ERROR}) {
4207: return 0;
4208: }
4209:
4210: return scalar(@{$parts}); # + $delta;
4211: }
4212:
4213: sub countResponses {
4214: my $self = shift;
4215: my $count;
4216: foreach my $part (@{$self->parts()}) {
4217: $count+= scalar($self->responseIds($part));
4218: }
4219: return $count;
4220: }
4221:
4222: sub responseTypes {
4223: my $self = shift;
4224: my %responses;
4225: foreach my $part (@{$self->parts()}) {
4226: foreach my $responsetype ($self->responseType($part)) {
4227: $responses{$responsetype}++ if (defined($responsetype));
4228: }
4229: }
4230: return %responses;
4231: }
4232:
4233: sub multipart {
4234: my $self = shift;
4235: return $self->countParts() > 1;
4236: }
4237:
4238: sub singlepart {
4239: my $self = shift;
4240: return $self->countParts() == 1;
4241: }
4242:
4243: sub responseType {
4244: my $self = shift;
4245: my $part = shift;
4246:
4247: $self->extractParts();
4248: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4249: return @{$self->{RESPONSE_TYPES}->{$part}};
4250: } else {
4251: return undef;
4252: }
4253: }
4254:
4255: sub responseIds {
4256: my $self = shift;
4257: my $part = shift;
4258:
4259: $self->extractParts();
4260: if (defined($self->{RESPONSE_IDS}->{$part})) {
4261: return @{$self->{RESPONSE_IDS}->{$part}};
4262: } else {
4263: return undef;
4264: }
4265: }
4266:
4267: # Private function: Extracts the parts information, both part names and
4268: # part types, and saves it.
4269: sub extractParts {
4270: my $self = shift;
4271:
4272: return if (defined($self->{PARTS}));
4273: return if ($self->ext);
4274:
4275: $self->{PARTS} = [];
4276:
4277: my %parts;
4278:
4279: # Retrieve part count, if this is a problem
4280: if ($self->is_problem()) {
4281: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4282: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4283:
4284: if ($partorder) {
4285: my @parts;
4286: for my $part (split (/,/,$partorder)) {
4287: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4288: push @parts, $part;
4289: $parts{$part} = 1;
4290: }
4291: }
4292: $self->{PARTS} = \@parts;
4293: } else {
4294: if (!$metadata) {
4295: $self->{RESOURCE_ERROR} = 1;
4296: $self->{PARTS} = [];
4297: $self->{PART_TYPE} = {};
4298: return;
4299: }
4300: foreach my $entry (split(/\,/,$metadata)) {
4301: if ($entry =~ /^(?:part|Task)_(.*)$/) {
4302: my $part = $1;
4303: # This floods the logs if it blows up
4304: if (defined($parts{$part})) {
4305: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4306: }
4307:
4308: # check to see if part is turned off.
4309:
4310: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4311: $parts{$part} = 1;
4312: }
4313: }
4314: }
4315: my @sortedParts = sort keys %parts;
4316: $self->{PARTS} = \@sortedParts;
4317: }
4318:
4319:
4320: # These hashes probably do not need names that end with "Hash"....
4321: my %responseIdHash;
4322: my %responseTypeHash;
4323:
4324:
4325: # Init the responseIdHash
4326: foreach my $part (@{$self->{PARTS}}) {
4327: $responseIdHash{$part} = [];
4328: }
4329:
4330: # Now, the unfortunate thing about this is that parts, part name, and
4331: # response id are delimited by underscores, but both the part
4332: # name and response id can themselves have underscores in them.
4333: # So we have to use our knowlege of part names to figure out
4334: # where the part names begin and end, and even then, it is possible
4335: # to construct ambiguous situations.
4336: foreach my $data (split /,/, $metadata) {
4337: if ($data =~ /^([a-zA-Z]+)response_(.*)/
4338: || $data =~ /^(Task)_(.*)/) {
4339: my $responseType = $1;
4340: my $partStuff = $2;
4341: my $partIdSoFar = '';
4342: my @partChunks = split /_/, $partStuff;
4343: my $i = 0;
4344: for ($i = 0; $i < scalar(@partChunks); $i++) {
4345: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4346: $partIdSoFar .= $partChunks[$i];
4347: if ($parts{$partIdSoFar}) {
4348: my @otherChunks = @partChunks[$i+1..$#partChunks];
4349: my $responseId = join('_', @otherChunks);
4350: if ($self->is_task()) {
4351: push(@{$responseIdHash{$partIdSoFar}},
4352: $partIdSoFar);
4353: } else {
4354: push(@{$responseIdHash{$partIdSoFar}},
4355: $responseId);
4356: }
4357: push(@{$responseTypeHash{$partIdSoFar}},
4358: $responseType);
4359: }
4360: }
4361: }
4362: }
4363: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4364: #
4365: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4366: if ($resorder) {
4367: my @resorder=split(/,/,$resorder);
4368: foreach my $part (keys(%responseIdHash)) {
4369: my $i=0;
4370: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4371: my @neworder;
4372: foreach my $possibleid (@resorder) {
4373: if (exists($resids{$possibleid})) {
4374: push(@neworder,$resids{$possibleid});
4375: }
4376: }
4377: my @ids;
4378: my @type;
4379: foreach my $element (@neworder) {
4380: push (@ids,$responseIdHash{$part}->[$element]);
4381: push (@type,$responseTypeHash{$part}->[$element]);
4382: }
4383: $responseIdHash{$part}=\@ids;
4384: $responseTypeHash{$part}=\@type;
4385: }
4386: }
4387: $self->{RESPONSE_IDS} = \%responseIdHash;
4388: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4389: }
4390:
4391: return;
4392: }
4393:
4394: =pod
4395:
4396: =head2 Resource Status
4397:
4398: Problem resources have status information, reflecting their various
4399: dates and completion statuses.
4400:
4401: There are two aspects to the status: the date-related information and
4402: the completion information.
4403:
4404: Idiomatic usage of these two methods would probably look something
4405: like
4406:
4407: foreach my $part ($resource->parts()) {
4408: my $dateStatus = $resource->getDateStatus($part);
4409: my $completionStatus = $resource->getCompletionStatus($part);
4410:
4411: or
4412:
4413: my $status = $resource->status($part);
4414:
4415: ... use it here ...
4416: }
4417:
4418: Which you use depends on exactly what you are looking for. The
4419: status() function has been optimized for the nav maps display and may
4420: not precisely match what you need elsewhere.
4421:
4422: The symbolic constants shown below can be accessed through the
4423: resource object: C<$res->OPEN>.
4424:
4425: =over 4
4426:
4427: =item * B<getDateStatus>($part):
4428:
4429: ($part defaults to 0). A convenience function that returns a symbolic
4430: constant telling you about the date status of the part. The possible
4431: return values are:
4432:
4433: =back
4434:
4435: B<Date Codes>
4436:
4437: =over 4
4438:
4439: =item * B<OPEN_LATER>:
4440:
4441: The problem will be opened later.
4442:
4443: =item * B<OPEN>:
4444:
4445: Open and not yet due.
4446:
4447:
4448: =item * B<PAST_DUE_ANSWER_LATER>:
4449:
4450: The due date has passed, but the answer date has not yet arrived.
4451:
4452: =item * B<PAST_DUE_NO_ANSWER>:
4453:
4454: The due date has passed and there is no answer opening date set.
4455:
4456: =item * B<ANSWER_OPEN>:
4457:
4458: The answer date is here.
4459:
4460: =item * B<NETWORK_FAILURE>:
4461:
4462: The information is unknown due to network failure.
4463:
4464: =back
4465:
4466: =cut
4467:
4468: # Apparently the compiler optimizes these into constants automatically
4469: sub OPEN_LATER { return 0; }
4470: sub OPEN { return 1; }
4471: sub PAST_DUE_NO_ANSWER { return 2; }
4472: sub PAST_DUE_ANSWER_LATER { return 3; }
4473: sub ANSWER_OPEN { return 4; }
4474: sub NOTHING_SET { return 5; }
4475: sub NETWORK_FAILURE { return 100; }
4476:
4477: # getDateStatus gets the date status for a given problem part.
4478: # Because answer date, due date, and open date are fully independent
4479: # (i.e., it is perfectly possible to *only* have an answer date),
4480: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4481: # (past, future, none given). This function handles this with a decision
4482: # tree. Read the comments to follow the decision tree.
4483:
4484: sub getDateStatus {
4485: my $self = shift;
4486: my $part = shift;
4487: $part = "0" if (!defined($part));
4488:
4489: # Always return network failure if there was one.
4490: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4491:
4492: my $now = time();
4493:
4494: my $open = $self->opendate($part);
4495: my $due = $self->duedate($part);
4496: my $answer = $self->answerdate($part);
4497:
4498: if (!$open && !$due && !$answer) {
4499: # no data on the problem at all
4500: # should this be the same as "open later"? think multipart.
4501: return $self->NOTHING_SET;
4502: }
4503: if (!$open || $now < $open) {return $self->OPEN_LATER}
4504: if (!$due || $now < $due) {return $self->OPEN}
4505: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4506: if ($answer) { return $self->ANSWER_OPEN; }
4507: return PAST_DUE_NO_ANSWER;
4508: }
4509:
4510: =pod
4511:
4512: B<>
4513:
4514: =over 4
4515:
4516: =item * B<getCompletionStatus>($part):
4517:
4518: ($part defaults to 0.) A convenience function that returns a symbolic
4519: constant telling you about the completion status of the part, with the
4520: following possible results:
4521:
4522: =back
4523:
4524: B<Completion Codes>
4525:
4526: =over 4
4527:
4528: =item * B<NOT_ATTEMPTED>:
4529:
4530: Has not been attempted at all.
4531:
4532: =item * B<INCORRECT>:
4533:
4534: Attempted, but wrong by student.
4535:
4536: =item * B<INCORRECT_BY_OVERRIDE>:
4537:
4538: Attempted, but wrong by instructor override.
4539:
4540: =item * B<CORRECT>:
4541:
4542: Correct or correct by instructor.
4543:
4544: =item * B<CORRECT_BY_OVERRIDE>:
4545:
4546: Correct by instructor override.
4547:
4548: =item * B<EXCUSED>:
4549:
4550: Excused. Not yet implemented.
4551:
4552: =item * B<NETWORK_FAILURE>:
4553:
4554: Information not available due to network failure.
4555:
4556: =item * B<ATTEMPTED>:
4557:
4558: Attempted, and not yet graded.
4559:
4560: =back
4561:
4562: =cut
4563:
4564: sub NOT_ATTEMPTED { return 10; }
4565: sub INCORRECT { return 11; }
4566: sub INCORRECT_BY_OVERRIDE { return 12; }
4567: sub CORRECT { return 13; }
4568: sub CORRECT_BY_OVERRIDE { return 14; }
4569: sub EXCUSED { return 15; }
4570: sub ATTEMPTED { return 16; }
4571:
4572: sub getCompletionStatus {
4573: my $self = shift;
4574: my $part = shift;
4575: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4576:
4577: my $status = $self->queryRestoreHash('solved', $part);
4578:
4579: # Left as separate if statements in case we ever do more with this
4580: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4581: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4582: if ($status eq 'correct_by_override') {
4583: return $self->CORRECT_BY_OVERRIDE;
4584: }
4585: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4586: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4587: if ($status eq 'excused') {return $self->EXCUSED; }
4588: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4589: return $self->NOT_ATTEMPTED;
4590: }
4591:
4592: sub queryRestoreHash {
4593: my $self = shift;
4594: my $hashentry = shift;
4595: my $part = shift;
4596: $part = "0" if (!defined($part) || $part eq '');
4597: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4598:
4599: $self->getReturnHash();
4600:
4601: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4602: }
4603:
4604: =pod
4605:
4606: B<Composite Status>
4607:
4608: Along with directly returning the date or completion status, the
4609: resource object includes a convenience function B<status>() that will
4610: combine the two status tidbits into one composite status that can
4611: represent the status of the resource as a whole. This method represents
4612: the concept of the thing we want to display to the user on the nav maps
4613: screen, which is a combination of completion and open status. The precise logic is
4614: documented in the comments of the status method. The following results
4615: may be returned, all available as methods on the resource object
4616: ($res->NETWORK_FAILURE): In addition to the return values that match
4617: the date or completion status, this function can return "ANSWER_SUBMITTED"
4618: if that problemstatus parameter value is set to No, suppressing the
4619: incorrect/correct feedback.
4620:
4621: =over 4
4622:
4623: =item * B<NETWORK_FAILURE>:
4624:
4625: The network has failed and the information is not available.
4626:
4627: =item * B<NOTHING_SET>:
4628:
4629: No dates have been set for this problem (part) at all. (Because only
4630: certain parts of a multi-part problem may be assigned, this can not be
4631: collapsed into "open later", as we do not know a given part will EVER
4632: be opened. For single part, this is the same as "OPEN_LATER".)
4633:
4634: =item * B<CORRECT>:
4635:
4636: For any reason at all, the part is considered correct.
4637:
4638: =item * B<EXCUSED>:
4639:
4640: For any reason at all, the problem is excused.
4641:
4642: =item * B<PAST_DUE_NO_ANSWER>:
4643:
4644: The problem is past due, not considered correct, and no answer date is
4645: set.
4646:
4647: =item * B<PAST_DUE_ANSWER_LATER>:
4648:
4649: The problem is past due, not considered correct, and an answer date in
4650: the future is set.
4651:
4652: =item * B<ANSWER_OPEN>:
4653:
4654: The problem is past due, not correct, and the answer is now available.
4655:
4656: =item * B<OPEN_LATER>:
4657:
4658: The problem is not yet open.
4659:
4660: =item * B<TRIES_LEFT>:
4661:
4662: The problem is open, has been tried, is not correct, but there are
4663: tries left.
4664:
4665: =item * B<INCORRECT>:
4666:
4667: The problem is open, and all tries have been used without getting the
4668: correct answer.
4669:
4670: =item * B<OPEN>:
4671:
4672: The item is open and not yet tried.
4673:
4674: =item * B<ATTEMPTED>:
4675:
4676: The problem has been attempted.
4677:
4678: =item * B<ANSWER_SUBMITTED>:
4679:
4680: An answer has been submitted, but the student should not see it.
4681:
4682: =back
4683:
4684: =cut
4685:
4686: sub TRIES_LEFT { return 20; }
4687: sub ANSWER_SUBMITTED { return 21; }
4688: sub PARTIALLY_CORRECT{ return 22; }
4689:
4690: sub status {
4691: my $self = shift;
4692: my $part = shift;
4693: if (!defined($part)) { $part = "0"; }
4694: my $completionStatus = $self->getCompletionStatus($part);
4695: my $dateStatus = $self->getDateStatus($part);
4696:
4697: # What we have is a two-dimensional matrix with 4 entries on one
4698: # dimension and 5 entries on the other, which we want to colorize,
4699: # plus network failure and "no date data at all".
4700:
4701: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4702: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4703:
4704: my $suppressFeedback = 0;
4705: if (($self->problemstatus($part) eq 'no') ||
4706: ($self->problemstatus($part) eq 'no_feedback_ever')) {
4707: $suppressFeedback = 1;
4708: }
4709: # If there's an answer date and we're past it, don't
4710: # suppress the feedback; student should know
4711: if ($self->duedate($part) && $self->duedate($part) < time() &&
4712: $self->answerdate($part) && $self->answerdate($part) < time()) {
4713: $suppressFeedback = 0;
4714: }
4715:
4716: # There are a few whole rows we can dispose of:
4717: if ($completionStatus == CORRECT ||
4718: $completionStatus == CORRECT_BY_OVERRIDE ) {
4719: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
4720: my $awarded=$self->awarded($part);
4721: if ($awarded < 1 && $awarded > 0) {
4722: return PARTIALLY_CORRECT;
4723: } elsif ($awarded<1) {
4724: return INCORRECT;
4725: }
4726: return CORRECT;
4727: }
4728:
4729: # If it's WRONG... and not open
4730: if ( ($completionStatus == INCORRECT ||
4731: $completionStatus == INCORRECT_BY_OVERRIDE)
4732: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
4733: return INCORRECT;
4734: }
4735:
4736: if ($completionStatus == ATTEMPTED) {
4737: return ATTEMPTED;
4738: }
4739:
4740: # If it's EXCUSED, then return that no matter what
4741: if ($completionStatus == EXCUSED) {
4742: return EXCUSED;
4743: }
4744:
4745: if ($dateStatus == NOTHING_SET) {
4746: return NOTHING_SET;
4747: }
4748:
4749: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4750: # by 4 matrix (date statuses).
4751:
4752: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4753: $dateStatus == PAST_DUE_NO_ANSWER ) {
4754: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4755: }
4756:
4757: if ($dateStatus == ANSWER_OPEN) {
4758: return ANSWER_OPEN;
4759: }
4760:
4761: # Now: (incorrect, incorrect_override, not_attempted) x
4762: # (open_later), (open)
4763:
4764: if ($dateStatus == OPEN_LATER) {
4765: return OPEN_LATER;
4766: }
4767:
4768: # If it's WRONG...
4769: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4770: # and there are TRIES LEFT:
4771: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4772: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4773: }
4774: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4775: }
4776:
4777: # Otherwise, it's untried and open
4778: return OPEN;
4779: }
4780:
4781: sub CLOSED { return 23; }
4782: sub ERROR { return 24; }
4783:
4784: =pod
4785:
4786: B<Simple Status>
4787:
4788: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4789: "Simple status" corresponds to "which icon is shown on the
4790: Navmaps". There are six "simple" statuses:
4791:
4792: =over 4
4793:
4794: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4795:
4796: =item * B<OPEN>: The problem is open and unattempted.
4797:
4798: =item * B<CORRECT>: The problem is correct for any reason.
4799:
4800: =item * B<INCORRECT>: The problem is incorrect and can still be
4801: completed successfully.
4802:
4803: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4804: does not know if they are correct. (The ellipsis icon.)
4805:
4806: =item * B<ERROR>: There is an error retrieving information about this
4807: problem.
4808:
4809: =back
4810:
4811: =cut
4812:
4813: # This hash maps the composite status to this simple status, and
4814: # can be used directly, if you like
4815: my %compositeToSimple =
4816: (
4817: NETWORK_FAILURE() => ERROR,
4818: NOTHING_SET() => CLOSED,
4819: CORRECT() => CORRECT,
4820: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
4821: EXCUSED() => CORRECT,
4822: PAST_DUE_NO_ANSWER() => INCORRECT,
4823: PAST_DUE_ANSWER_LATER() => INCORRECT,
4824: ANSWER_OPEN() => INCORRECT,
4825: OPEN_LATER() => CLOSED,
4826: TRIES_LEFT() => OPEN,
4827: INCORRECT() => INCORRECT,
4828: OPEN() => OPEN,
4829: ATTEMPTED() => ATTEMPTED,
4830: ANSWER_SUBMITTED() => ATTEMPTED
4831: );
4832:
4833: sub simpleStatus {
4834: my $self = shift;
4835: my $part = shift;
4836: my $status = $self->status($part);
4837: return $compositeToSimple{$status};
4838: }
4839:
4840: =pod
4841:
4842: B<simpleStatusCount> will return an array reference containing, in
4843: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4844: and ERROR parts the given problem has.
4845:
4846: =cut
4847:
4848: # This maps the status to the slot we want to increment
4849: my %statusToSlotMap =
4850: (
4851: OPEN() => 0,
4852: CLOSED() => 1,
4853: CORRECT() => 2,
4854: INCORRECT() => 3,
4855: ATTEMPTED() => 4,
4856: ERROR() => 5
4857: );
4858:
4859: sub statusToSlot { return $statusToSlotMap{shift()}; }
4860:
4861: sub simpleStatusCount {
4862: my $self = shift;
4863:
4864: my @counts = (0, 0, 0, 0, 0, 0, 0);
4865: foreach my $part (@{$self->parts()}) {
4866: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4867: }
4868:
4869: return \@counts;
4870: }
4871:
4872: =pod
4873:
4874: B<Completable>
4875:
4876: The completable method represents the concept of I<whether the student can
4877: currently do the problem>. If the student can do the problem, which means
4878: that it is open, there are tries left, and if the problem is manually graded
4879: or the grade is suppressed via problemstatus, the student has not tried it
4880: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4881: either the student has tried it and there is no feedback, or that for
4882: some reason it is no longer completable (not open yet, successfully completed,
4883: out of tries, etc.). As an example, this is used as the filter for the
4884: "Uncompleted Homework" option for the nav maps.
4885:
4886: If this does not quite meet your needs, do not fiddle with it (unless you are
4887: fixing it to better match the student's conception of "completable" because
4888: it's broken somehow)... make a new method.
4889:
4890: =cut
4891:
4892: sub completable {
4893: my $self = shift;
4894: if (!$self->is_problem()) { return 0; }
4895: my $partCount = $self->countParts();
4896:
4897: foreach my $part (@{$self->parts()}) {
4898: if ($part eq '0' && $partCount != 1) { next; }
4899: my $status = $self->status($part);
4900: # "If any of the parts are open, or have tries left (implies open),
4901: # and it is not "attempted" (manually graded problem), it is
4902: # not "complete"
4903: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4904: $status == ANSWER_SUBMITTED() ) {
4905: # did this part already, as well as we can
4906: next;
4907: }
4908: if ($status == OPEN() || $status == TRIES_LEFT()) {
4909: return 1;
4910: }
4911: }
4912:
4913: # If all the parts were complete, so was this problem.
4914: return 0;
4915: }
4916:
4917: =pod
4918:
4919: =head2 Resource/Nav Map Navigation
4920:
4921: =over 4
4922:
4923: =item * B<getNext>():
4924:
4925: Retreive an array of the possible next resources after this
4926: one. Always returns an array, even in the one- or zero-element case.
4927:
4928: =item * B<getPrevious>():
4929:
4930: Retreive an array of the possible previous resources from this
4931: one. Always returns an array, even in the one- or zero-element case.
4932:
4933: =cut
4934:
4935: sub getNext {
4936: my $self = shift;
4937: my @branches;
4938: my $to = $self->to();
4939: foreach my $branch ( split(/,/, $to) ) {
4940: my $choice = $self->{NAV_MAP}->getById($branch);
4941: #if (!$choice->condition()) { next; }
4942: my $next = $choice->goesto();
4943: $next = $self->{NAV_MAP}->getById($next);
4944:
4945: push @branches, $next;
4946: }
4947: return \@branches;
4948: }
4949:
4950: sub getPrevious {
4951: my $self = shift;
4952: my @branches;
4953: my $from = $self->from();
4954: foreach my $branch ( split /,/, $from) {
4955: my $choice = $self->{NAV_MAP}->getById($branch);
4956: my $prev = $choice->comesfrom();
4957: $prev = $self->{NAV_MAP}->getById($prev);
4958:
4959: push @branches, $prev;
4960: }
4961: return \@branches;
4962: }
4963:
4964: sub browsePriv {
4965: my $self = shift;
4966: if (defined($self->{BROWSE_PRIV})) {
4967: return $self->{BROWSE_PRIV};
4968: }
4969:
4970: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
4971: $self->symb());
4972: }
4973:
4974: =pod
4975:
4976: =back
4977:
4978: =cut
4979:
4980: 1;
4981:
4982: __END__
4983:
4984:
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