1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.263 2004/06/28 15:09:13 albertel 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: package Apache::lonnavmaps;
31:
32: use strict;
33: use Apache::Constants qw(:common :http);
34: use Apache::loncommon();
35: use Apache::lonmenu();
36: use Apache::lonlocal;
37: use POSIX qw (floor strftime);
38: use Data::Dumper; # for debugging, not always used
39:
40: # symbolic constants
41: sub SYMB { return 1; }
42: sub URL { return 2; }
43: sub NOTHING { return 3; }
44:
45: # Some data
46:
47: my $resObj = "Apache::lonnavmaps::resource";
48:
49: # Keep these mappings in sync with lonquickgrades, which uses the colors
50: # instead of the icons.
51: my %statusIconMap =
52: (
53: $resObj->CLOSED => '',
54: $resObj->OPEN => 'navmap.open.gif',
55: $resObj->CORRECT => 'navmap.correct.gif',
56: $resObj->INCORRECT => 'navmap.wrong.gif',
57: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
58: $resObj->ERROR => ''
59: );
60:
61: my %iconAltTags =
62: ( 'navmap.correct.gif' => 'Correct',
63: 'navmap.wrong.gif' => 'Incorrect',
64: 'navmap.open.gif' => 'Open' );
65:
66: # Defines a status->color mapping, null string means don't color
67: my %colormap =
68: ( $resObj->NETWORK_FAILURE => '',
69: $resObj->CORRECT => '',
70: $resObj->EXCUSED => '#3333FF',
71: $resObj->PAST_DUE_ANSWER_LATER => '',
72: $resObj->PAST_DUE_NO_ANSWER => '',
73: $resObj->ANSWER_OPEN => '#006600',
74: $resObj->OPEN_LATER => '',
75: $resObj->TRIES_LEFT => '',
76: $resObj->INCORRECT => '',
77: $resObj->OPEN => '',
78: $resObj->NOTHING_SET => '',
79: $resObj->ATTEMPTED => '',
80: $resObj->ANSWER_SUBMITTED => ''
81: );
82: # And a special case in the nav map; what to do when the assignment
83: # is not yet done and due in less then 24 hours
84: my $hurryUpColor = "#FF0000";
85:
86: sub handler {
87: my $r = shift;
88: real_handler($r);
89: }
90:
91: sub real_handler {
92: my $r = shift;
93:
94: # Handle header-only request
95: if ($r->header_only) {
96: if ($ENV{'browser.mathml'}) {
97: &Apache::loncommon::content_type($r,'text/xml');
98: } else {
99: &Apache::loncommon::content_type($r,'text/html');
100: }
101: $r->send_http_header;
102: return OK;
103: }
104:
105: # Send header, don't cache this page
106: if ($ENV{'browser.mathml'}) {
107: &Apache::loncommon::content_type($r,'text/xml');
108: } else {
109: &Apache::loncommon::content_type($r,'text/html');
110: }
111: &Apache::loncommon::no_cache($r);
112: $r->send_http_header;
113:
114: # Create the nav map
115: my $navmap = Apache::lonnavmaps::navmap->new();
116:
117: if (!defined($navmap)) {
118: my $requrl = $r->uri;
119: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
120: return HTTP_NOT_ACCEPTABLE;
121: }
122:
123: $r->print("<html><head>\n");
124: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
125: # ------------------------------------------------------------ Get query string
126: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
127:
128: # ----------------------------------------------------- Force menu registration
129: my $addentries='';
130: if ($ENV{'form.register'}) {
131: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
132: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
133: $r->print(&Apache::lonmenu::registerurl(1));
134: }
135:
136: # Header
137: $r->print('</head>'.
138: &Apache::loncommon::bodytag('Navigate Course Contents','',
139: $addentries,'','',$ENV{'form.register'}));
140: $r->print('<script>window.focus();</script>'.
141: &Apache::loncommon::help_open_topic('Navigation_Screen').
142: &Apache::loncommon::help_open_bug('RAT'));
143:
144: $r->rflush();
145:
146: # Check that it's defined
147: if (!($navmap->courseMapDefined())) {
148: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
149: '</body></html>');
150: return OK;
151: }
152:
153: # See if there's only one map in the top-level, if we don't
154: # already have a filter... if so, automatically display it
155: # (older code; should use retrieveResources)
156: if ($ENV{QUERY_STRING} !~ /filter/) {
157: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
158: my $curRes;
159: my $sequenceCount = 0;
160: my $sequenceId;
161: while ($curRes = $iterator->next()) {
162: if (ref($curRes) && $curRes->is_sequence()) {
163: $sequenceCount++;
164: $sequenceId = $curRes->map_pc();
165: }
166: }
167:
168: if ($sequenceCount == 1) {
169: # The automatic iterator creation in the render call
170: # will pick this up. We know the condition because
171: # the defined($ENV{'form.filter'}) also ensures this
172: # is a fresh call.
173: $ENV{'form.filter'} = "$sequenceId";
174: }
175: }
176:
177: my $jumpToFirstHomework = 0;
178: # Check to see if the student is jumping to next open, do-able problem
179: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
180: $jumpToFirstHomework = 1;
181: # Find the next homework problem that they can do.
182: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
183: my $curRes;
184: my $foundDoableProblem = 0;
185: my $problemRes;
186:
187: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
188: if (ref($curRes) && $curRes->is_problem()) {
189: my $status = $curRes->status();
190: if ($curRes->completable()) {
191: $problemRes = $curRes;
192: $foundDoableProblem = 1;
193:
194: # Pop open all previous maps
195: my $stack = $iterator->getStack();
196: pop @$stack; # last resource in the stack is the problem
197: # itself, which we don't need in the map stack
198: my @mapPcs = map {$_->map_pc()} @$stack;
199: $ENV{'form.filter'} = join(',', @mapPcs);
200:
201: # Mark as both "here" and "jump"
202: $ENV{'form.postsymb'} = $curRes->symb();
203: }
204: }
205: }
206:
207: # If we found no problems, print a note to that effect.
208: if (!$foundDoableProblem) {
209: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
210: }
211: } else {
212: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
213: &mt("Go To My First Homework Problem")."</a> ");
214: }
215:
216: my $suppressEmptySequences = 0;
217: my $filterFunc = undef;
218: my $resource_no_folder_link = 0;
219:
220: # Display only due homework.
221: my $showOnlyHomework = 0;
222: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
223: $showOnlyHomework = 1;
224: $suppressEmptySequences = 1;
225: $filterFunc = sub { my $res = shift;
226: return $res->completable() || $res->is_map();
227: };
228: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
229: $ENV{'form.filter'} = '';
230: $ENV{'form.condition'} = 1;
231: $resource_no_folder_link = 1;
232: } else {
233: $r->print("<a href='navmaps?showOnlyHomework'>" .
234: &mt("Show Only Uncompleted Homework")."</a> ");
235: }
236:
237: # renderer call
238: my $renderArgs = { 'cols' => [0,1,2,3],
239: 'url' => '/adm/navmaps',
240: 'navmap' => $navmap,
241: 'suppressNavmap' => 1,
242: 'suppressEmptySequences' => $suppressEmptySequences,
243: 'filterFunc' => $filterFunc,
244: 'resource_no_folder_link' => $resource_no_folder_link,
245: 'r' => $r};
246: my $render = render($renderArgs);
247: $navmap->untieHashes();
248:
249: # If no resources were printed, print a reassuring message so the
250: # user knows there was no error.
251: if ($renderArgs->{'counter'} == 0) {
252: if ($showOnlyHomework) {
253: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
254: } else { # both jumpToFirstHomework and normal use the same: course must be empty
255: $r->print("<p><font size='+1'>This course is empty.</font></p>");
256: }
257: }
258:
259: $r->print("</body></html>");
260: $r->rflush();
261:
262: return OK;
263: }
264:
265: # Convenience functions: Returns a string that adds or subtracts
266: # the second argument from the first hash, appropriate for the
267: # query string that determines which folders to recurse on
268: sub addToFilter {
269: my $hashIn = shift;
270: my $addition = shift;
271: my %hash = %$hashIn;
272: $hash{$addition} = 1;
273:
274: return join (",", keys(%hash));
275: }
276:
277: sub removeFromFilter {
278: my $hashIn = shift;
279: my $subtraction = shift;
280: my %hash = %$hashIn;
281:
282: delete $hash{$subtraction};
283: return join(",", keys(%hash));
284: }
285:
286: # Convenience function: Given a stack returned from getStack on the iterator,
287: # return the correct src() value.
288: # Later, this should add an anchor when we start putting anchors in pages.
289: sub getLinkForResource {
290: my $stack = shift;
291: my $res;
292:
293: # Check to see if there are any pages in the stack
294: foreach $res (@$stack) {
295: if (defined($res)) {
296: if ($res->is_page()) {
297: return $res->src();
298: }
299: # in case folder was skipped over as "only sequence"
300: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
301: if ($map=~/\.page$/) {
302: return &Apache::lonnet::clutter($map).'#'.
303: &Apache::lonnet::escape(&Apache::lonnet::declutter($src));
304: }
305: }
306: }
307:
308: # Failing that, return the src of the last resource that is defined
309: # (when we first recurse on a map, it puts an undefined resource
310: # on the bottom because $self->{HERE} isn't defined yet, and we
311: # want the src for the map anyhow)
312: foreach (@$stack) {
313: if (defined($_)) { $res = $_; }
314: }
315:
316: return $res->src();
317: }
318:
319: # Convenience function: This separates the logic of how to create
320: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
321: # etc.) into a separate function. It takes a resource object as the
322: # first parameter, and the part number of the resource as the second.
323: # It's basically a big switch statement on the status of the resource.
324:
325: sub getDescription {
326: my $res = shift;
327: my $part = shift;
328: my $status = $res->status($part);
329:
330: if ($status == $res->NETWORK_FAILURE) {
331: return &mt("Having technical difficulties; please check status later");
332: }
333: if ($status == $res->NOTHING_SET) {
334: return &mt("Not currently assigned.");
335: }
336: if ($status == $res->OPEN_LATER) {
337: return "Open " . timeToHumanString($res->opendate($part));
338: }
339: if ($status == $res->OPEN) {
340: if ($res->duedate($part)) {
341: return &mt("Due")." " .timeToHumanString($res->duedate($part));
342: } else {
343: return &mt("Open, no due date");
344: }
345: }
346: if ($status == $res->PAST_DUE_ANSWER_LATER) {
347: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
348: }
349: if ($status == $res->PAST_DUE_NO_ANSWER) {
350: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
351: }
352: if ($status == $res->ANSWER_OPEN) {
353: return &mt("Answer available");
354: }
355: if ($status == $res->EXCUSED) {
356: return &mt("Excused by instructor");
357: }
358: if ($status == $res->ATTEMPTED) {
359: return &mt("Answer submitted, not yet graded");
360: }
361: if ($status == $res->TRIES_LEFT) {
362: my $tries = $res->tries($part);
363: my $maxtries = $res->maxtries($part);
364: my $triesString = "";
365: if ($tries && $maxtries) {
366: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
367: if ($maxtries > 1 && $maxtries - $tries == 1) {
368: $triesString = "<b>$triesString</b>";
369: }
370: }
371: if ($res->duedate($part)) {
372: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
373: " $triesString";
374: } else {
375: return &mt("No due date")." $triesString";
376: }
377: }
378: if ($status == $res->ANSWER_SUBMITTED) {
379: return &mt('Answer submitted');
380: }
381: }
382:
383: # Convenience function, so others can use it: Is the problem due in less then
384: # 24 hours, and still can be done?
385:
386: sub dueInLessThan24Hours {
387: my $res = shift;
388: my $part = shift;
389: my $status = $res->status($part);
390:
391: return ($status == $res->OPEN() ||
392: $status == $res->TRIES_LEFT()) &&
393: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
394: $res->duedate($part) > time();
395: }
396:
397: # Convenience function, so others can use it: Is there only one try remaining for the
398: # part, with more then one try to begin with, not due yet and still can be done?
399: sub lastTry {
400: my $res = shift;
401: my $part = shift;
402:
403: my $tries = $res->tries($part);
404: my $maxtries = $res->maxtries($part);
405: return $tries && $maxtries && $maxtries > 1 &&
406: $maxtries - $tries == 1 && $res->duedate($part) &&
407: $res->duedate($part) > time();
408: }
409:
410: # This puts a human-readable name on the ENV variable.
411:
412: sub advancedUser {
413: return $ENV{'request.role.adv'};
414: }
415:
416:
417: # timeToHumanString takes a time number and converts it to a
418: # human-readable representation, meant to be used in the following
419: # manner:
420: # print "Due $timestring"
421: # print "Open $timestring"
422: # print "Answer available $timestring"
423: # Very, very, very, VERY English-only... goodness help a localizer on
424: # this func...
425: sub timeToHumanString {
426: my ($time) = @_;
427: # zero, '0' and blank are bad times
428: if (!$time) {
429: return &mt('never');
430: }
431: unless (&Apache::lonlocal::current_language()=~/^en/) {
432: return &Apache::lonlocal::locallocaltime($time);
433: }
434: my $now = time();
435:
436: my @time = localtime($time);
437: my @now = localtime($now);
438:
439: # Positive = future
440: my $delta = $time - $now;
441:
442: my $minute = 60;
443: my $hour = 60 * $minute;
444: my $day = 24 * $hour;
445: my $week = 7 * $day;
446: my $inPast = 0;
447:
448: # Logic in comments:
449: # Is it now? (extremely unlikely)
450: if ( $delta == 0 ) {
451: return "this instant";
452: }
453:
454: if ($delta < 0) {
455: $inPast = 1;
456: $delta = -$delta;
457: }
458:
459: if ( $delta > 0 ) {
460:
461: my $tense = $inPast ? " ago" : "";
462: my $prefix = $inPast ? "" : "in ";
463:
464: # Less then a minute
465: if ( $delta < $minute ) {
466: if ($delta == 1) { return "${prefix}1 second$tense"; }
467: return "$prefix$delta seconds$tense";
468: }
469:
470: # Less then an hour
471: if ( $delta < $hour ) {
472: # If so, use minutes
473: my $minutes = floor($delta / 60);
474: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
475: return "$prefix$minutes minutes$tense";
476: }
477:
478: # Is it less then 24 hours away? If so,
479: # display hours + minutes
480: if ( $delta < $hour * 24) {
481: my $hours = floor($delta / $hour);
482: my $minutes = floor(($delta % $hour) / $minute);
483: my $hourString = "$hours hours";
484: my $minuteString = ", $minutes minutes";
485: if ($hours == 1) {
486: $hourString = "1 hour";
487: }
488: if ($minutes == 1) {
489: $minuteString = ", 1 minute";
490: }
491: if ($minutes == 0) {
492: $minuteString = "";
493: }
494: return "$prefix$hourString$minuteString$tense";
495: }
496:
497: # Less then 5 days away, display day of the week and
498: # HH:MM
499: if ( $delta < $day * 5 ) {
500: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
501: $timeStr =~ s/12:00 am/00:00/;
502: $timeStr =~ s/12:00 pm/noon/;
503: return ($inPast ? "last " : "next ") .
504: $timeStr;
505: }
506:
507: # Is it this year?
508: if ( $time[5] == $now[5]) {
509: # Return on Month Day, HH:MM meridian
510: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
511: $timeStr =~ s/12:00 am/00:00/;
512: $timeStr =~ s/12:00 pm/noon/;
513: return $timeStr;
514: }
515:
516: # Not this year, so show the year
517: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
518: $timeStr =~ s/12:00 am/00:00/;
519: $timeStr =~ s/12:00 pm/noon/;
520: return $timeStr;
521: }
522: }
523:
524:
525: =pod
526:
527: =head1 NAME
528:
529: Apache::lonnavmap - Subroutines to handle and render the navigation
530: maps
531:
532: =head1 SYNOPSIS
533:
534: The main handler generates the navigational listing for the course,
535: the other objects export this information in a usable fashion for
536: other modules.
537:
538: =head1 OVERVIEW
539:
540: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
541: course structure and caches it in what is often referred to as the
542: "big hash" X<big hash>. You can see it if you are logged into
543: LON-CAPA, in a course, by going to /adm/test. (You may need to
544: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
545: content of the hash will be under the heading "Big Hash".
546:
547: Big Hash contains, among other things, how resources are related
548: to each other (next/previous), what resources are maps, which
549: resources are being chosen to not show to the student (for random
550: selection), and a lot of other things that can take a lot of time
551: to compute due to the amount of data that needs to be collected and
552: processed.
553:
554: Apache::lonnavmaps provides an object model for manipulating this
555: information in a higher-level fashion then directly manipulating
556: the hash. It also provides access to several auxilary functions
557: that aren't necessarily stored in the Big Hash, but are a per-
558: resource sort of value, like whether there is any feedback on
559: a given resource.
560:
561: Apache::lonnavmaps also abstracts away branching, and someday,
562: conditions, for the times where you don't really care about those
563: things.
564:
565: Apache::lonnavmaps also provides fairly powerful routines for
566: rendering navmaps, and last but not least, provides the navmaps
567: view for when the user clicks the NAV button.
568:
569: B<Note>: Apache::lonnavmaps I<only> works for the "currently
570: logged in user"; if you want things like "due dates for another
571: student" lonnavmaps can not directly retrieve information like
572: that. You need the EXT function. This module can still help,
573: because many things, such as the course structure, are constant
574: between users, and Apache::lonnavmaps can help by providing
575: symbs for the EXT call.
576:
577: The rest of this file will cover the provided rendering routines,
578: which can often be used without fiddling with the navmap object at
579: all, then documents the Apache::lonnavmaps::navmap object, which
580: is the key to accessing the Big Hash information, covers the use
581: of the Iterator (which provides the logic for traversing the
582: somewhat-complicated Big Hash data structure), documents the
583: Apache::lonnavmaps::Resource objects that are returned by
584:
585: =head1 Subroutine: render
586:
587: The navmap renderer package provides a sophisticated rendering of the
588: standard navigation maps interface into HTML. The provided nav map
589: handler is actually just a glorified call to this.
590:
591: Because of the large number of parameters this function accepts,
592: instead of passing it arguments as is normal, pass it in an anonymous
593: hash with the desired options.
594:
595: The package provides a function called 'render', called as
596: Apache::lonnavmaps::render({}).
597:
598: =head2 Overview of Columns
599:
600: The renderer will build an HTML table for the navmap and return
601: it. The table is consists of several columns, and a row for each
602: resource (or possibly each part). You tell the renderer how many
603: columns to create and what to place in each column, optionally using
604: one or more of the prepared columns, and the renderer will assemble
605: the table.
606:
607: Any additional generally useful column types should be placed in the
608: renderer code here, so anybody can use it anywhere else. Any code
609: specific to the current application (such as the addition of <input>
610: elements in a column) should be placed in the code of the thing using
611: the renderer.
612:
613: At the core of the renderer is the array reference COLS (see Example
614: section below for how to pass this correctly). The COLS array will
615: consist of entries of one of two types of things: Either an integer
616: representing one of the pre-packaged column types, or a sub reference
617: that takes a resource reference, a part number, and a reference to the
618: argument hash passed to the renderer, and returns a string that will
619: be inserted into the HTML representation as it.
620:
621: All other parameters are ways of either changing how the columns
622: are printing, or which rows are shown.
623:
624: The pre-packaged column names are refered to by constants in the
625: Apache::lonnavmaps namespace. The following currently exist:
626:
627: =over 4
628:
629: =item * B<Apache::lonnavmaps::resource>:
630:
631: The general info about the resource: Link, icon for the type, etc. The
632: first column in the standard nav map display. This column provides the
633: indentation effect seen in the B<NAV> screen. This column also accepts
634: the following parameters in the renderer hash:
635:
636: =over 4
637:
638: =item * B<resource_nolink>: default false
639:
640: If true, the resource will not be linked. By default, all non-folder
641: resources are linked.
642:
643: =item * B<resource_part_count>: default true
644:
645: If true, the resource will show a part count B<if> the full
646: part list is not displayed. (See "condense_parts" later.) If false,
647: the resource will never show a part count.
648:
649: =item * B<resource_no_folder_link>:
650:
651: If true, the resource's folder will not be clickable to open or close
652: it. Default is false. True implies printCloseAll is false, since you
653: can't close or open folders when this is on anyhow.
654:
655: =back
656:
657: =item * B<Apache::lonnavmaps::communication_status>:
658:
659: Whether there is discussion on the resource, email for the user, or
660: (lumped in here) perl errors in the execution of the problem. This is
661: the second column in the main nav map.
662:
663: =item * B<Apache::lonnavmaps::quick_status>:
664:
665: An icon for the status of a problem, with five possible states:
666: Correct, incorrect, open, awaiting grading (for a problem where the
667: computer's grade is suppressed, or the computer can't grade, like
668: essay problem), or none (not open yet, not a problem). The
669: third column of the standard navmap.
670:
671: =item * B<Apache::lonnavmaps::long_status>:
672:
673: A text readout of the details of the current status of the problem,
674: such as "Due in 22 hours". The fourth column of the standard navmap.
675:
676: =item * B<Apache::lonnavmaps::part_status_summary>:
677:
678: A text readout summarizing the status of the problem. If it is a
679: single part problem, will display "Correct", "Incorrect",
680: "Not yet open", "Open", "Attempted", or "Error". If there are
681: multiple parts, this will output a string that in HTML will show a
682: status of how many parts are in each status, in color coding, trying
683: to match the colors of the icons within reason.
684:
685: Note this only makes sense if you are I<not> showing parts. If
686: C<showParts> is true (see below), this column will not output
687: anything.
688:
689: =back
690:
691: If you add any others please be sure to document them here.
692:
693: An example of a column renderer that will show the ID number of a
694: resource, along with the part name if any:
695:
696: sub {
697: my ($resource, $part, $params) = @_;
698: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
699: return '<td>' . $resource->{ID} . '</td>';
700: }
701:
702: Note these functions are responsible for the TD tags, which allow them
703: to override vertical and horizontal alignment, etc.
704:
705: =head2 Parameters
706:
707: Minimally, you should be
708: able to get away with just using 'cols' (to specify the columns
709: shown), 'url' (necessary for the folders to link to the current screen
710: correctly), and possibly 'queryString' if your app calls for it. In
711: that case, maintaining the state of the folders will be done
712: automatically.
713:
714: =over 4
715:
716: =item * B<iterator>: default: constructs one from %ENV
717:
718: A reference to a fresh ::iterator to use from the navmaps. The
719: rendering will reflect the options passed to the iterator, so you can
720: use that to just render a certain part of the course, if you like. If
721: one is not passed, the renderer will attempt to construct one from
722: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
723: 'iterator_map' parameter if any.
724:
725: =item * B<iterator_map>: default: not used
726:
727: If you are letting the renderer do the iterator handling, you can
728: instruct the renderer to render only a particular map by passing it
729: the source of the map you want to process, like
730: '/res/103/jerf/navmap.course.sequence'.
731:
732: =item * B<navmap>: default: constructs one from %ENV
733:
734: A reference to a navmap, used only if an iterator is not passed in. If
735: this is necessary to make an iterator but it is not passed in, a new
736: one will be constructed based on ENV info. This is useful to do basic
737: error checking before passing it off to render.
738:
739: =item * B<r>: default: must be passed in
740:
741: The standard Apache response object. This must be passed to the
742: renderer or the course hash will be locked.
743:
744: =item * B<cols>: default: empty (useless)
745:
746: An array reference
747:
748: =item * B<showParts>:default true
749:
750: A flag. If true, a line for the resource itself, and a line
751: for each part will be displayed. If not, only one line for each
752: resource will be displayed.
753:
754: =item * B<condenseParts>: default true
755:
756: A flag. If true, if all parts of the problem have the same
757: status and that status is Nothing Set, Correct, or Network Failure,
758: then only one line will be displayed for that resource anyhow. If no,
759: all parts will always be displayed. If showParts is 0, this is
760: ignored.
761:
762: =item * B<jumpCount>: default: determined from %ENV
763:
764: A string identifying the URL to place the anchor 'curloc' at.
765: It is the responsibility of the renderer user to
766: ensure that the #curloc is in the URL. By default, determined through
767: the use of the ENV{} 'jump' information, and should normally "just
768: work" correctly.
769:
770: =item * B<here>: default: empty string
771:
772: A Symb identifying where to place the 'here' marker. The empty
773: string means no marker.
774:
775: =item * B<indentString>: default: 25 pixel whitespace image
776:
777: A string identifying the indentation string to use.
778:
779: =item * B<queryString>: default: empty
780:
781: A string which will be prepended to the query string used when the
782: folders are opened or closed. You can use this to pass
783: application-specific values.
784:
785: =item * B<url>: default: none
786:
787: The url the folders will link to, which should be the current
788: page. Required if the resource info column is shown, and you
789: are allowing the user to open and close folders.
790:
791: =item * B<currentJumpIndex>: default: no jumping
792:
793: Describes the currently-open row number to cause the browser to jump
794: to, because the user just opened that folder. By default, pulled from
795: the Jump information in the ENV{'form.*'}.
796:
797: =item * B<printKey>: default: false
798:
799: If true, print the key that appears on the top of the standard
800: navmaps.
801:
802: =item * B<printCloseAll>: default: true
803:
804: If true, print the "Close all folders" or "open all folders"
805: links.
806:
807: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
808:
809: A function that takes the resource object as its only parameter and
810: returns a true or false value. If true, the resource is displayed. If
811: false, it is simply skipped in the display.
812:
813: =item * B<suppressEmptySequences>: default: false
814:
815: If you're using a filter function, and displaying sequences to orient
816: the user, then frequently some sequences will be empty. Setting this to
817: true will cause those sequences not to display, so as not to confuse the
818: user into thinking that if the sequence is there there should be things
819: under it; for example, see the "Show Uncompleted Homework" view on the
820: B<NAV> screen.
821:
822: =item * B<suppressNavmaps>: default: false
823:
824: If true, will not display Navigate Content resources.
825:
826: =back
827:
828: =head2 Additional Info
829:
830: In addition to the parameters you can pass to the renderer, which will
831: be passed through unchange to the column renderers, the renderer will
832: generate the following information which your renderer may find
833: useful:
834:
835: =over 4
836:
837: =item * B<counter>:
838:
839: Contains the number of rows printed. Useful after calling the render
840: function, as you can detect whether anything was printed at all.
841:
842: =item * B<isNewBranch>:
843:
844: Useful for renderers: If this resource is currently the first resource
845: of a new branch, this will be true. The Resource column (leftmost in the
846: navmaps screen) uses this to display the "new branch" icon
847:
848: =back
849:
850: =cut
851:
852: sub resource { return 0; }
853: sub communication_status { return 1; }
854: sub quick_status { return 2; }
855: sub long_status { return 3; }
856: sub part_status_summary { return 4; }
857:
858: sub render_resource {
859: my ($resource, $part, $params) = @_;
860:
861: my $nonLinkedText = ''; # stuff after resource title not in link
862:
863: my $link = $params->{"resourceLink"};
864: my $src = $resource->src();
865: my $it = $params->{"iterator"};
866: my $filter = $it->{FILTER};
867:
868: my $title = $resource->compTitle();
869:
870: my $partLabel = "";
871: my $newBranchText = "";
872:
873: # If this is a new branch, label it so
874: if ($params->{'isNewBranch'}) {
875: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
876: }
877:
878: # links to open and close the folder
879: my $linkopen = "<a href='$link'>";
880: my $linkclose = "</a>";
881:
882: # Default icon: unknown page
883: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
884:
885: if ($resource->is_problem()) {
886: if ($part eq '0' || $params->{'condensed'}) {
887: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
888: } else {
889: $icon = $params->{'indentString'};
890: }
891: } else {
892: $icon = "<img src='".&Apache::loncommon::icon($resource->src).
893: "' alt='' border='0' />";
894: }
895:
896: # Display the correct map icon to open or shut map
897: if ($resource->is_map()) {
898: my $mapId = $resource->map_pc();
899: my $nowOpen = !defined($filter->{$mapId});
900: if ($it->{CONDITION}) {
901: $nowOpen = !$nowOpen;
902: }
903:
904: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
905:
906: if (!$params->{'resource_no_folder_link'}) {
907: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
908: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
909:
910: $linkopen = "<a href='" . $params->{'url'} . '?' .
911: $params->{'queryString'} . '&filter=';
912: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
913: addToFilter($filter, $mapId) :
914: removeFromFilter($filter, $mapId);
915: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
916: . $params->{'hereType'} . '&here=' .
917: &Apache::lonnet::escape($params->{'here'}) .
918: '&jump=' .
919: &Apache::lonnet::escape($resource->symb()) .
920: "&folderManip=1'>";
921: } else {
922: # Don't allow users to manipulate folder
923: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
924: '.nomanip.gif';
925: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
926:
927: $linkopen = "";
928: $linkclose = "";
929: }
930: }
931:
932: if ($resource->randomout()) {
933: $nonLinkedText .= ' <i>(hidden)</i> ';
934: }
935:
936: # We're done preparing and finally ready to start the rendering
937: my $result = "<td align='left' valign='center'>";
938:
939: my $indentLevel = $params->{'indentLevel'};
940: if ($newBranchText) { $indentLevel--; }
941:
942: # print indentation
943: for (my $i = 0; $i < $indentLevel; $i++) {
944: $result .= $params->{'indentString'};
945: }
946:
947: # Decide what to display
948: $result .= "$newBranchText$linkopen$icon$linkclose";
949:
950: my $curMarkerBegin = '';
951: my $curMarkerEnd = '';
952:
953: # Is this the current resource?
954: if (!$params->{'displayedHereMarker'} &&
955: $resource->symb() eq $params->{'here'} ) {
956: $curMarkerBegin = '<font color="red" size="+2">> </font>';
957: $curMarkerEnd = '<font color="red" size="+2"><</font>';
958: $params->{'displayedHereMarker'} = 1;
959: }
960:
961: if ($resource->is_problem() && $part ne '0' &&
962: !$params->{'condensed'}) {
963: my $displaypart=&Apache::lonnet::EXT('resource.'.$part.'.display',
964: $resource->symb());
965: unless ($displaypart) { $displaypart=$part; }
966: $partLabel = " (Part: $displaypart)";
967: $link.='#'.&Apache::lonnet::escape($part);
968: $title = "";
969: }
970:
971: if ($params->{'condensed'} && $resource->countParts() > 1) {
972: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
973: }
974:
975: if (!$params->{'resource_nolink'} && !$resource->is_sequence()) {
976: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
977: } else {
978: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
979: }
980:
981: return $result;
982: }
983:
984: sub render_communication_status {
985: my ($resource, $part, $params) = @_;
986: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
987:
988: my $link = $params->{"resourceLink"};
989: my $linkopen = "<a href='$link'>";
990: my $linkclose = "</a>";
991:
992: if ($resource->hasDiscussion()) {
993: $discussionHTML = $linkopen .
994: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
995: $linkclose;
996: }
997:
998: if ($resource->getFeedback()) {
999: my $feedback = $resource->getFeedback();
1000: foreach (split(/\,/, $feedback)) {
1001: if ($_) {
1002: $feedbackHTML .= ' <a href="/adm/email?display='
1003: . &Apache::lonnet::escape($_) . '">'
1004: . '<img src="/adm/lonMisc/feedback.gif" '
1005: . 'border="0" /></a>';
1006: }
1007: }
1008: }
1009:
1010: if ($resource->getErrors()) {
1011: my $errors = $resource->getErrors();
1012: my $errorcount = 0;
1013: foreach (split(/,/, $errors)) {
1014: last if ($errorcount>=10); # Only output 10 bombs maximum
1015: if ($_) {
1016: $errorcount++;
1017: $errorHTML .= ' <a href="/adm/email?display='
1018: . &Apache::lonnet::escape($_) . '">'
1019: . '<img src="/adm/lonMisc/bomb.gif" '
1020: . 'border="0" /></a>';
1021: }
1022: }
1023: }
1024:
1025: if ($params->{'multipart'} && $part != '0') {
1026: $discussionHTML = $feedbackHTML = $errorHTML = '';
1027: }
1028:
1029: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1030:
1031: }
1032: sub render_quick_status {
1033: my ($resource, $part, $params) = @_;
1034: my $result = "";
1035: my $firstDisplayed = !$params->{'condensed'} &&
1036: $params->{'multipart'} && $part eq "0";
1037:
1038: my $link = $params->{"resourceLink"};
1039: my $linkopen = "<a href='$link'>";
1040: my $linkclose = "</a>";
1041:
1042: if ($resource->is_problem() &&
1043: !$firstDisplayed) {
1044:
1045: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1046: my $alt = $iconAltTags{$icon};
1047: if ($icon) {
1048: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1049: } else {
1050: $result .= "<td width='30'> </td>\n";
1051: }
1052: } else { # not problem, no icon
1053: $result .= "<td width='30'> </td>\n";
1054: }
1055:
1056: return $result;
1057: }
1058: sub render_long_status {
1059: my ($resource, $part, $params) = @_;
1060: my $result = "<td align='right' valign='center'>\n";
1061: my $firstDisplayed = !$params->{'condensed'} &&
1062: $params->{'multipart'} && $part eq "0";
1063:
1064: my $color;
1065: if ($resource->is_problem()) {
1066: $color = $colormap{$resource->status};
1067:
1068: if (dueInLessThan24Hours($resource, $part) ||
1069: lastTry($resource, $part)) {
1070: $color = $hurryUpColor;
1071: }
1072: }
1073:
1074: if ($resource->kind() eq "res" &&
1075: $resource->is_problem() &&
1076: !$firstDisplayed) {
1077: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1078: $result .= getDescription($resource, $part);
1079: if ($color) {$result .= "</b></font>"; }
1080: }
1081: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1082: $result .= '(randomly select ' . $resource->randompick() .')';
1083: }
1084:
1085: # Debugging code
1086: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1087: # ' - Part: ' . $part;
1088:
1089: $result .= "</td>\n";
1090:
1091: return $result;
1092: }
1093:
1094: # Colors obtained by taking the icons, matching the colors, and
1095: # possibly reducing the Value (HSV) of the color, if it's too bright
1096: # for text, generally by one third or so.
1097: my %statusColors =
1098: (
1099: $resObj->CLOSED => '#000000',
1100: $resObj->OPEN => '#998b13',
1101: $resObj->CORRECT => '#26933f',
1102: $resObj->INCORRECT => '#c48207',
1103: $resObj->ATTEMPTED => '#a87510',
1104: $resObj->ERROR => '#000000'
1105: );
1106: my %statusStrings =
1107: (
1108: $resObj->CLOSED => 'Not yet open',
1109: $resObj->OPEN => 'Open',
1110: $resObj->CORRECT => 'Correct',
1111: $resObj->INCORRECT => 'Incorrect',
1112: $resObj->ATTEMPTED => 'Attempted',
1113: $resObj->ERROR => 'Network Error'
1114: );
1115: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1116:
1117: use Data::Dumper;
1118: sub render_parts_summary_status {
1119: my ($resource, $part, $params) = @_;
1120: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1121: if ($params->{showParts}) {
1122: return '<td></td>';
1123: }
1124:
1125: my $td = "<td align='right'>\n";
1126: my $endtd = "</td>\n";
1127: my @probs;
1128:
1129: if ($resource->contains_problem) {
1130: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1131: } else {
1132: @probs=($resource);
1133: }
1134: my $return;
1135: my %overallstatus;
1136: my $totalParts;
1137: foreach my $resource (@probs) {
1138: # If there is a single part, just show the simple status
1139: if ($resource->singlepart()) {
1140: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1141: $overallstatus{$status}++;
1142: $totalParts++;
1143: next;
1144: }
1145: # Now we can be sure the $part doesn't really matter.
1146: my $statusCount = $resource->simpleStatusCount();
1147: my @counts;
1148: foreach my $status (@statuses) {
1149: # decouple display order from the simpleStatusCount order
1150: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1151: if ($statusCount->[$slot]) {
1152: $overallstatus{$status}+=$statusCount->[$slot];
1153: $totalParts+=$statusCount->[$slot];
1154: }
1155: }
1156: }
1157: $return.= $td . $totalParts . ' parts: ';
1158: foreach my $status (@statuses) {
1159: if ($overallstatus{$status}) {
1160: $return.="<font color='" . $statusColors{$status} .
1161: "'>" . $overallstatus{$status} . ' '
1162: . $statusStrings{$status} . "</font>";
1163: }
1164: }
1165: $return.= $endtd;
1166: return $return;
1167: }
1168:
1169: my @preparedColumns = (\&render_resource, \&render_communication_status,
1170: \&render_quick_status, \&render_long_status,
1171: \&render_parts_summary_status);
1172:
1173: sub setDefault {
1174: my ($val, $default) = @_;
1175: if (!defined($val)) { return $default; }
1176: return $val;
1177: }
1178:
1179: sub render {
1180: my $args = shift;
1181: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1182: my $result = '';
1183:
1184: # Configure the renderer.
1185: my $cols = $args->{'cols'};
1186: if (!defined($cols)) {
1187: # no columns, no nav maps.
1188: return '';
1189: }
1190: my $mustCloseNavMap = 0;
1191: my $navmap;
1192: if (defined($args->{'navmap'})) {
1193: $navmap = $args->{'navmap'};
1194: }
1195:
1196: my $r = $args->{'r'};
1197: my $queryString = $args->{'queryString'};
1198: my $jump = $args->{'jump'};
1199: my $here = $args->{'here'};
1200: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1201: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1202: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1203: # before the current resource when using #current
1204:
1205: # If we were passed 'here' information, we are not rendering
1206: # after a folder manipulation, and we were not passed an
1207: # iterator, make sure we open the folders to show the "here"
1208: # marker
1209: my $filterHash = {};
1210: # Figure out what we're not displaying
1211: foreach (split(/\,/, $ENV{"form.filter"})) {
1212: if ($_) {
1213: $filterHash->{$_} = "1";
1214: }
1215: }
1216:
1217: # Filter: Remember filter function and add our own filter: Refuse
1218: # to show hidden resources unless the user can see them.
1219: my $userCanSeeHidden = advancedUser();
1220: my $filterFunc = setDefault($args->{'filterFunc'},
1221: sub {return 1;});
1222: if (!$userCanSeeHidden) {
1223: # Without renaming the filterfunc, the server seems to go into
1224: # an infinite loop
1225: my $oldFilterFunc = $filterFunc;
1226: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1227: &$oldFilterFunc($res);};
1228: }
1229:
1230: my $condition = 0;
1231: if ($ENV{'form.condition'}) {
1232: $condition = 1;
1233: }
1234:
1235: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1236: # Step 1: Check to see if we have a navmap
1237: if (!defined($navmap)) {
1238: $navmap = Apache::lonnavmaps::navmap->new();
1239: $mustCloseNavMap = 1;
1240: }
1241:
1242: # Step two: Locate what kind of here marker is necessary
1243: # Determine where the "here" marker is and where the screen jumps to.
1244:
1245: if ($ENV{'form.postsymb'}) {
1246: $here = $jump = $ENV{'form.postsymb'};
1247: } elsif ($ENV{'form.postdata'}) {
1248: # couldn't find a symb, is there a URL?
1249: my $currenturl = $ENV{'form.postdata'};
1250: #$currenturl=~s/^http\:\/\///;
1251: #$currenturl=~s/^[^\/]+//;
1252:
1253: $here = $jump = &Apache::lonnet::symbread($currenturl);
1254: }
1255:
1256: # Step three: Ensure the folders are open
1257: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1258: my $curRes;
1259: my $found = 0;
1260:
1261: # We only need to do this if we need to open the maps to show the
1262: # current position. This will change the counter so we can't count
1263: # for the jump marker with this loop.
1264: while (($curRes = $mapIterator->next()) && !$found) {
1265: if (ref($curRes) && $curRes->symb() eq $here) {
1266: my $mapStack = $mapIterator->getStack();
1267:
1268: # Ensure the parent maps are open
1269: for my $map (@{$mapStack}) {
1270: if ($condition) {
1271: undef $filterHash->{$map->map_pc()};
1272: } else {
1273: $filterHash->{$map->map_pc()} = 1;
1274: }
1275: }
1276: $found = 1;
1277: }
1278: }
1279: }
1280:
1281: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1282: # If this is a click on a folder or something, we want to preserve the "here"
1283: # from the querystring, and get the new "jump" marker
1284: $here = $ENV{'form.here'};
1285: $jump = $ENV{'form.jump'};
1286: }
1287:
1288: my $it = $args->{'iterator'};
1289: if (!defined($it)) {
1290: # Construct a default iterator based on $ENV{'form.'} information
1291:
1292: # Step 1: Check to see if we have a navmap
1293: if (!defined($navmap)) {
1294: $navmap = Apache::lonnavmaps::navmap->new();
1295: $mustCloseNavMap = 1;
1296: }
1297:
1298: # See if we're being passed a specific map
1299: if ($args->{'iterator_map'}) {
1300: my $map = $args->{'iterator_map'};
1301: $map = $navmap->getResourceByUrl($map);
1302: my $firstResource = $map->map_start();
1303: my $finishResource = $map->map_finish();
1304:
1305: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1306: } else {
1307: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1308: }
1309: }
1310:
1311: # (re-)Locate the jump point, if any
1312: # Note this does not take filtering or hidden into account... need
1313: # to be fixed?
1314: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1315: my $curRes;
1316: my $foundJump = 0;
1317: my $counter = 0;
1318:
1319: while (($curRes = $mapIterator->next()) && !$foundJump) {
1320: if (ref($curRes)) { $counter++; }
1321:
1322: if (ref($curRes) && $jump eq $curRes->symb()) {
1323:
1324: # This is why we have to use the main iterator instead of the
1325: # potentially faster DFS: The count has to be the same, so
1326: # the order has to be the same, which DFS won't give us.
1327: $args->{'currentJumpIndex'} = $counter;
1328: $foundJump = 1;
1329: }
1330: }
1331:
1332: my $showParts = setDefault($args->{'showParts'}, 1);
1333: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1334: # keeps track of when the current resource is found,
1335: # so we can back up a few and put the anchor above the
1336: # current resource
1337: my $printKey = $args->{'printKey'};
1338: my $printCloseAll = $args->{'printCloseAll'};
1339: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1340:
1341: # Print key?
1342: if ($printKey) {
1343: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1344: my $date=localtime;
1345: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1346: if ($navmap->{LAST_CHECK}) {
1347: $result .=
1348: '<img src="/adm/lonMisc/chat.gif"> '.&mt('New discussion since').' '.
1349: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1350: '</td><td align="center" valign="bottom"> '.
1351: '<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1352: '</td>';
1353: } else {
1354: $result .= '<td align="center" valign="bottom"> '.
1355: '<img src="/adm/lonMisc/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1356: ' <img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').
1357: '</td>';
1358: }
1359:
1360: $result .= '</tr></table>';
1361: }
1362:
1363: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1364: if ($condition) {
1365: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1366: "&here=" . Apache::lonnet::escape($here) .
1367: "\">".&mt('Close All Folders')."</a>";
1368: } else {
1369: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1370: "&here=" . Apache::lonnet::escape($here) .
1371: "\">".&mt('Open All Folders')."</a>";
1372: }
1373: $result .= "<br /><br />\n";
1374: }
1375:
1376: if ($r) {
1377: $r->print($result);
1378: $r->rflush();
1379: $result = "";
1380: }
1381: # End parameter setting
1382:
1383: # Data
1384: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1385: my $res = "Apache::lonnavmaps::resource";
1386: my %condenseStatuses =
1387: ( $res->NETWORK_FAILURE => 1,
1388: $res->NOTHING_SET => 1,
1389: $res->CORRECT => 1 );
1390: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1391:
1392: # Shared variables
1393: $args->{'counter'} = 0; # counts the rows
1394: $args->{'indentLevel'} = 0;
1395: $args->{'isNewBranch'} = 0;
1396: $args->{'condensed'} = 0;
1397: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1398: $args->{'displayedHereMarker'} = 0;
1399:
1400: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1401: # since structure actually doesn't matter, except what map has what resources.
1402: if ($args->{'suppressEmptySequences'}) {
1403: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1404: $it->{FIRST_RESOURCE},
1405: $it->{FINISH_RESOURCE},
1406: {}, undef, 1);
1407: my $depth = 0;
1408: $dfsit->next();
1409: my $curRes = $dfsit->next();
1410: while ($depth > -1) {
1411: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1412: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1413:
1414: if (ref($curRes)) {
1415: # Parallel pre-processing: Do sequences have non-filtered-out children?
1416: if ($curRes->is_map()) {
1417: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1418: # Sequences themselves do not count as visible children,
1419: # unless those sequences also have visible children.
1420: # This means if a sequence appears, there's a "promise"
1421: # that there's something under it if you open it, somewhere.
1422: } else {
1423: # Not a sequence: if it's filtered, ignore it, otherwise
1424: # rise up the stack and mark the sequences as having children
1425: if (&$filterFunc($curRes)) {
1426: for my $sequence (@{$dfsit->getStack()}) {
1427: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1428: }
1429: }
1430: }
1431: }
1432: } continue {
1433: $curRes = $dfsit->next();
1434: }
1435: }
1436:
1437: my $displayedJumpMarker = 0;
1438: # Set up iteration.
1439: my $now = time();
1440: my $in24Hours = $now + 24 * 60 * 60;
1441: my $rownum = 0;
1442:
1443: # export "here" marker information
1444: $args->{'here'} = $here;
1445:
1446: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1447: while ($curRes = $it->next($closeAllPages)) {
1448: # Maintain indentation level.
1449: if ($curRes == $it->BEGIN_MAP() ||
1450: $curRes == $it->BEGIN_BRANCH() ) {
1451: $args->{'indentLevel'}++;
1452: }
1453: if ($curRes == $it->END_MAP() ||
1454: $curRes == $it->END_BRANCH() ) {
1455: $args->{'indentLevel'}--;
1456: }
1457: # Notice new branches
1458: if ($curRes == $it->BEGIN_BRANCH()) {
1459: $args->{'isNewBranch'} = 1;
1460: }
1461:
1462: # If this isn't an actual resource, continue on
1463: if (!ref($curRes)) {
1464: next;
1465: }
1466:
1467: # If this has been filtered out, continue on
1468: if (!(&$filterFunc($curRes))) {
1469: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1470: next;
1471: }
1472:
1473: # If this is an empty sequence and we're filtering them, continue on
1474: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1475: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1476: next;
1477: }
1478:
1479: # If we're suppressing navmaps and this is a navmap, continue on
1480: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1481: next;
1482: }
1483:
1484: $args->{'counter'}++;
1485:
1486: # Does it have multiple parts?
1487: $args->{'multipart'} = 0;
1488: $args->{'condensed'} = 0;
1489: my @parts;
1490:
1491: # Decide what parts to show.
1492: if ($curRes->is_problem() && $showParts) {
1493: @parts = @{$curRes->parts()};
1494: $args->{'multipart'} = $curRes->multipart();
1495:
1496: if ($condenseParts) { # do the condensation
1497: if (!$curRes->opendate("0")) {
1498: @parts = ();
1499: $args->{'condensed'} = 1;
1500: }
1501: if (!$args->{'condensed'}) {
1502: # Decide whether to condense based on similarity
1503: my $status = $curRes->status($parts[0]);
1504: my $due = $curRes->duedate($parts[0]);
1505: my $open = $curRes->opendate($parts[0]);
1506: my $statusAllSame = 1;
1507: my $dueAllSame = 1;
1508: my $openAllSame = 1;
1509: for (my $i = 1; $i < scalar(@parts); $i++) {
1510: if ($curRes->status($parts[$i]) != $status){
1511: $statusAllSame = 0;
1512: }
1513: if ($curRes->duedate($parts[$i]) != $due ) {
1514: $dueAllSame = 0;
1515: }
1516: if ($curRes->opendate($parts[$i]) != $open) {
1517: $openAllSame = 0;
1518: }
1519: }
1520: # $*allSame is true if all the statuses were
1521: # the same. Now, if they are all the same and
1522: # match one of the statuses to condense, or they
1523: # are all open with the same due date, or they are
1524: # all OPEN_LATER with the same open date, display the
1525: # status of the first non-zero part (to get the 'correct'
1526: # status right, since 0 is never 'correct' or 'open').
1527: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1528: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1529: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1530: @parts = ($parts[0]);
1531: $args->{'condensed'} = 1;
1532: }
1533: }
1534: # Multipart problem with one part: always "condense" (happens
1535: # to match the desirable behavior)
1536: if ($curRes->countParts() == 1) {
1537: @parts = ($parts[0]);
1538: $args->{'condensed'} = 1;
1539: }
1540: }
1541: }
1542:
1543: # If the multipart problem was condensed, "forget" it was multipart
1544: if (scalar(@parts) == 1) {
1545: $args->{'multipart'} = 0;
1546: } else {
1547: # Add part 0 so we display it correctly.
1548: unshift @parts, '0';
1549: }
1550:
1551: # Now, we've decided what parts to show. Loop through them and
1552: # show them.
1553: foreach my $part (@parts) {
1554: $rownum ++;
1555: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1556:
1557: $result .= " <tr bgcolor='$backgroundColor'>\n";
1558:
1559: # Set up some data about the parts that the cols might want
1560: my $filter = $it->{FILTER};
1561: my $stack = $it->getStack();
1562: my $src = getLinkForResource($stack);
1563: my $anchor='';
1564: if ($src=~s/(\#.*$)//) {
1565: $anchor=$1;
1566: }
1567: my $srcHasQuestion = $src =~ /\?/;
1568: $args->{"resourceLink"} = $src.
1569: ($srcHasQuestion?'&':'?') .
1570: 'symb=' . &Apache::lonnet::escape($curRes->symb()).
1571: $anchor;
1572:
1573: # Now, display each column.
1574: foreach my $col (@$cols) {
1575: my $colHTML = '';
1576: if (ref($col)) {
1577: $colHTML .= &$col($curRes, $part, $args);
1578: } else {
1579: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1580: }
1581:
1582: # If this is the first column and it's time to print
1583: # the anchor, do so
1584: if ($col == $cols->[0] &&
1585: $args->{'counter'} == $args->{'currentJumpIndex'} -
1586: $currentJumpDelta) {
1587: # Jam the anchor after the <td> tag;
1588: # necessary for valid HTML (which Mozilla requires)
1589: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1590: $displayedJumpMarker = 1;
1591: }
1592: $result .= $colHTML . "\n";
1593: }
1594: $result .= " </tr>\n";
1595: $args->{'isNewBranch'} = 0;
1596: }
1597:
1598: if ($r && $rownum % 20 == 0) {
1599: $r->print($result);
1600: $result = "";
1601: $r->rflush();
1602: }
1603: } continue {
1604: if ($r) {
1605: # If we have the connection, make sure the user is still connected
1606: my $c = $r->connection;
1607: if ($c->aborted()) {
1608: # Who cares what we do, nobody will see it anyhow.
1609: return '';
1610: }
1611: }
1612: }
1613:
1614: # Print out the part that jumps to #curloc if it exists
1615: # delay needed because the browser is processing the jump before
1616: # it finishes rendering, so it goes to the wrong place!
1617: # onload might be better, but this routine has no access to that.
1618: # On mozilla, the 0-millisecond timeout seems to prevent this;
1619: # it's quite likely this might fix other browsers, too, and
1620: # certainly won't hurt anything.
1621: if ($displayedJumpMarker) {
1622: $result .= "
1623: <script>
1624: if (location.href.indexOf('#curloc')==-1) {
1625: setTimeout(\"location += '#curloc';\", 0)
1626: }
1627: </script>";
1628: }
1629:
1630: $result .= "</table>";
1631:
1632: if ($r) {
1633: $r->print($result);
1634: $result = "";
1635: $r->rflush();
1636: }
1637:
1638: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1639:
1640: return $result;
1641: }
1642:
1643: 1;
1644:
1645: package Apache::lonnavmaps::navmap;
1646:
1647: =pod
1648:
1649: =head1 Object: Apache::lonnavmaps::navmap
1650:
1651: =head2 Overview
1652:
1653: The navmap object's job is to provide access to the resources
1654: in the course as Apache::lonnavmaps::resource objects, and to
1655: query and manage the relationship between those resource objects.
1656:
1657: Generally, you'll use the navmap object in one of three basic ways.
1658: In order of increasing complexity and power:
1659:
1660: =over 4
1661:
1662: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
1663: various ways to obtain resource objects, based on various identifiers.
1664: Use this when you want to request information about one object or
1665: a handful of resources you already know the identities of, from some
1666: other source. For more about Ids, Symbs, and MapPcs, see the
1667: Resource documentation. Note that Url should be a B<last resort>,
1668: not your first choice; it only works when there is only one
1669: instance of the resource in the course, which only applies to
1670: maps, and even that may change in the future.
1671:
1672: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1673: retrieves resources matching some criterion and returns them
1674: in a flat array, with no structure information. Use this when
1675: you are manipulating a series of resources, based on what map
1676: the are in, but do not care about branching, or exactly how
1677: the maps and resources are related. This is the most common case.
1678:
1679: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1680: the course's navmap in various ways without writing the traversal
1681: code yourself. See iterator documentation below. Use this when
1682: you need to know absolutely everything about the course, including
1683: branches and the precise relationship between maps and resources.
1684:
1685: =back
1686:
1687: =head2 Creation And Destruction
1688:
1689: To create a navmap object, use the following function:
1690:
1691: =over 4
1692:
1693: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1694:
1695: Creates a new navmap object. Returns the navmap object if this is
1696: successful, or B<undef> if not.
1697:
1698: =back
1699:
1700: When you are done with the $navmap object, you I<must> call
1701: $navmap->untieHashes(), or you'll prevent the current user from using that
1702: course until the web server is restarted. (!)
1703:
1704: =head2 Methods
1705:
1706: =over 4
1707:
1708: =item * B<getIterator>(first, finish, filter, condition):
1709:
1710: See iterator documentation below.
1711:
1712: =cut
1713:
1714: use strict;
1715: use GDBM_File;
1716:
1717: sub new {
1718: # magic invocation to create a class instance
1719: my $proto = shift;
1720: my $class = ref($proto) || $proto;
1721: my $self = {};
1722:
1723: # Resource cache stores navmap resources as we reference them. We generate
1724: # them on-demand so we don't pay for creating resources unless we use them.
1725: $self->{RESOURCE_CACHE} = {};
1726:
1727: # Network failure flag, if we accessed the course or user opt and
1728: # failed
1729: $self->{NETWORK_FAILURE} = 0;
1730:
1731: # tie the nav hash
1732:
1733: my %navmaphash;
1734: my %parmhash;
1735: my $courseFn = $ENV{"request.course.fn"};
1736: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1737: &GDBM_READER(), 0640))) {
1738: return undef;
1739: }
1740:
1741: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1742: &GDBM_READER(), 0640)))
1743: {
1744: untie %{$self->{PARM_HASH}};
1745: return undef;
1746: }
1747:
1748: $self->{NAV_HASH} = \%navmaphash;
1749: $self->{PARM_HASH} = \%parmhash;
1750: $self->{PARM_CACHE} = {};
1751:
1752: bless($self);
1753:
1754: return $self;
1755: }
1756:
1757: sub generate_course_user_opt {
1758: my $self = shift;
1759: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1760:
1761: my $uname=$ENV{'user.name'};
1762: my $udom=$ENV{'user.domain'};
1763: my $uhome=$ENV{'user.home'};
1764: my $cid=$ENV{'request.course.id'};
1765: my $chome=$ENV{'course.'.$cid.'.home'};
1766: my ($cdom,$cnum)=split(/\_/,$cid);
1767:
1768: my $userprefix=$uname.'_'.$udom.'_';
1769:
1770: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1771: unless ($uhome eq 'no_host') {
1772: # ------------------------------------------------- Get coursedata (if present)
1773: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1774: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1775: ':resourcedata',$chome);
1776: # Check for network failure
1777: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1778: $self->{NETWORK_FAILURE} = 1;
1779: } elsif ($reply!~/^error\:/) {
1780: $courserdatas{$cid}=$reply;
1781: $courserdatas{$cid.'.last_cache'}=time;
1782: }
1783: }
1784: foreach (split(/\&/,$courserdatas{$cid})) {
1785: my ($name,$value)=split(/\=/,$_);
1786: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1787: &Apache::lonnet::unescape($value);
1788: }
1789: # --------------------------------------------------- Get userdata (if present)
1790: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1791: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1792: if ($reply!~/^error\:/) {
1793: $userrdatas{$uname.'___'.$udom}=$reply;
1794: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1795: }
1796: # check to see if network failed
1797: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1798: {
1799: $self->{NETWORK_FAILURE} = 1;
1800: }
1801: }
1802: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1803: my ($name,$value)=split(/\=/,$_);
1804: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1805: &Apache::lonnet::unescape($value);
1806: }
1807: $self->{COURSE_OPT} = \%courseopt;
1808: $self->{USER_OPT} = \%useropt;
1809: }
1810:
1811: $self->{COURSE_USER_OPT_GENERATED} = 1;
1812:
1813: return;
1814: }
1815:
1816: sub generate_email_discuss_status {
1817: my $self = shift;
1818: my $symb = shift;
1819: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1820:
1821: my $cid=$ENV{'request.course.id'};
1822: my ($cdom,$cnum)=split(/\_/,$cid);
1823:
1824: my %emailstatus = &Apache::lonnet::dump('email_status');
1825: my $logoutTime = $emailstatus{'logout'};
1826: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1827: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1828: $courseLeaveTime : $logoutTime);
1829: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1830: $cdom, $cnum);
1831: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
1832: $ENV{'user.domain'},$ENV{'user.name'},'lastread');
1833: my %lastreadtime = ();
1834: foreach (keys %lastread) {
1835: my $key = $_;
1836: $key =~ s/_lastread$//;
1837: $lastreadtime{$key} = $lastread{$_};
1838: }
1839:
1840: my %feedback=();
1841: my %error=();
1842: my $keys = &Apache::lonnet::reply('keys:'.
1843: $ENV{'user.domain'}.':'.
1844: $ENV{'user.name'}.':nohist_email',
1845: $ENV{'user.home'});
1846:
1847: foreach my $msgid (split(/\&/, $keys)) {
1848: $msgid=&Apache::lonnet::unescape($msgid);
1849: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1850: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1851: my ($what,$url)=($1,$2);
1852: my %status=
1853: &Apache::lonnet::get('email_status',[$msgid]);
1854: if ($status{$msgid}=~/^error\:/) {
1855: $status{$msgid}='';
1856: }
1857:
1858: if (($status{$msgid} eq 'new') ||
1859: (!$status{$msgid})) {
1860: if ($what eq 'Error') {
1861: $error{$url}.=','.$msgid;
1862: } else {
1863: $feedback{$url}.=','.$msgid;
1864: }
1865: }
1866: }
1867: }
1868:
1869: $self->{FEEDBACK} = \%feedback;
1870: $self->{ERROR_MSG} = \%error; # what is this? JB
1871: $self->{DISCUSSION_TIME} = \%discussiontime;
1872: $self->{EMAIL_STATUS} = \%emailstatus;
1873: $self->{LAST_READ} = \%lastreadtime;
1874:
1875: $self->{EMAIL_DISCUSS_GENERATED} = 1;
1876: }
1877:
1878: sub get_user_data {
1879: my $self = shift;
1880: if ($self->{RETRIEVED_USER_DATA}) { return; }
1881:
1882: # Retrieve performance data on problems
1883: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1884: $ENV{'user.domain'},
1885: $ENV{'user.name'});
1886: $self->{STUDENT_DATA} = \%student_data;
1887:
1888: $self->{RETRIEVED_USER_DATA} = 1;
1889: }
1890:
1891: # Internal function: Takes a key to look up in the nav hash and implements internal
1892: # memory caching of that key.
1893: sub navhash {
1894: my $self = shift; my $key = shift;
1895: return $self->{NAV_HASH}->{$key};
1896: }
1897:
1898: =pod
1899:
1900: =item * B<courseMapDefined>(): Returns true if the course map is defined,
1901: false otherwise. Undefined course maps indicate an error somewhere in
1902: LON-CAPA, and you will not be able to proceed with using the navmap.
1903: See the B<NAV> screen for an example of using this.
1904:
1905: =cut
1906:
1907: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1908: sub courseMapDefined {
1909: my $self = shift;
1910: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1911:
1912: my $firstres = $self->navhash("map_start_$uri");
1913: my $lastres = $self->navhash("map_finish_$uri");
1914: return $firstres && $lastres;
1915: }
1916:
1917: sub getIterator {
1918: my $self = shift;
1919: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1920: shift, undef, shift);
1921: return $iterator;
1922: }
1923:
1924: # unties the hash when done
1925: sub untieHashes {
1926: my $self = shift;
1927: untie %{$self->{NAV_HASH}};
1928: untie %{$self->{PARM_HASH}};
1929: }
1930:
1931: # Private method: Does the given resource (as a symb string) have
1932: # current discussion? Returns 0 if chat/mail data not extracted.
1933: sub hasDiscussion {
1934: my $self = shift;
1935: my $symb = shift;
1936:
1937: $self->generate_email_discuss_status();
1938:
1939: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1940:
1941: #return defined($self->{DISCUSSION_TIME}->{$symb});
1942:
1943: # backward compatibility (bulletin boards used to be 'wrapped')
1944: my $ressymb = $symb;
1945: if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
1946: unless ($ressymb =~ m|bulletin___\d+___adm/wrapper|) {
1947: $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
1948: }
1949: }
1950:
1951: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
1952: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
1953: } else {
1954: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK};
1955: }
1956: }
1957:
1958: # Private method: Does the given resource (as a symb string) have
1959: # current feedback? Returns the string in the feedback hash, which
1960: # will be false if it does not exist.
1961: sub getFeedback {
1962: my $self = shift;
1963: my $symb = shift;
1964:
1965: $self->generate_email_discuss_status();
1966:
1967: if (!defined($self->{FEEDBACK})) { return ""; }
1968:
1969: return $self->{FEEDBACK}->{$symb};
1970: }
1971:
1972: # Private method: Get the errors for that resource (by source).
1973: sub getErrors {
1974: my $self = shift;
1975: my $src = shift;
1976:
1977: $self->generate_email_discuss_status();
1978:
1979: if (!defined($self->{ERROR_MSG})) { return ""; }
1980: return $self->{ERROR_MSG}->{$src};
1981: }
1982:
1983: =pod
1984:
1985: =item * B<getById>(id):
1986:
1987: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1988: object for that resource. This method, or other methods that use it
1989: (as in the resource object) is the only proper way to obtain a
1990: resource object.
1991:
1992: =item * B<getBySymb>(symb):
1993:
1994: Based on the symb of the resource, get a resource object for that
1995: resource. This is one of the proper ways to get a resource object.
1996:
1997: =item * B<getMapByMapPc>(map_pc):
1998:
1999: Based on the map_pc of the resource, get a resource object for
2000: the given map. This is one of the proper ways to get a resource object.
2001:
2002: =cut
2003:
2004: # The strategy here is to cache the resource objects, and only construct them
2005: # as we use them. The real point is to prevent reading any more from the tied
2006: # hash then we have to, which should hopefully alleviate speed problems.
2007:
2008: sub getById {
2009: my $self = shift;
2010: my $id = shift;
2011:
2012: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2013: {
2014: return $self->{RESOURCE_CACHE}->{$id};
2015: }
2016:
2017: # resource handles inserting itself into cache.
2018: # Not clear why the quotes are necessary, but as of this
2019: # writing it doesn't work without them.
2020: return "Apache::lonnavmaps::resource"->new($self, $id);
2021: }
2022:
2023: sub getBySymb {
2024: my $self = shift;
2025: my $symb = shift;
2026: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2027: my $map = $self->getResourceByUrl($mapUrl);
2028: return $self->getById($map->map_pc() . '.' . $id);
2029: }
2030:
2031: sub getByMapPc {
2032: my $self = shift;
2033: my $map_pc = shift;
2034: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2035: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2036: return $self->getById($map_id);
2037: }
2038:
2039: =pod
2040:
2041: =item * B<firstResource>():
2042:
2043: Returns a resource object reference corresponding to the first
2044: resource in the navmap.
2045:
2046: =cut
2047:
2048: sub firstResource {
2049: my $self = shift;
2050: my $firstResource = $self->navhash('map_start_' .
2051: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2052: return $self->getById($firstResource);
2053: }
2054:
2055: =pod
2056:
2057: =item * B<finishResource>():
2058:
2059: Returns a resource object reference corresponding to the last resource
2060: in the navmap.
2061:
2062: =cut
2063:
2064: sub finishResource {
2065: my $self = shift;
2066: my $firstResource = $self->navhash('map_finish_' .
2067: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2068: return $self->getById($firstResource);
2069: }
2070:
2071: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2072: # the actual lookup; parmval caches the results.
2073: sub parmval {
2074: my $self = shift;
2075: my ($what,$symb)=@_;
2076: my $hashkey = $what."|||".$symb;
2077:
2078: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2079: return $self->{PARM_CACHE}->{$hashkey};
2080: }
2081:
2082: my $result = $self->parmval_real($what, $symb);
2083: $self->{PARM_CACHE}->{$hashkey} = $result;
2084: return $result;
2085: }
2086:
2087: sub parmval_real {
2088: my $self = shift;
2089: my ($what,$symb,$recurse) = @_;
2090:
2091: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2092: $self->generate_course_user_opt();
2093:
2094: my $cid=$ENV{'request.course.id'};
2095: my $csec=$ENV{'request.course.sec'};
2096: my $uname=$ENV{'user.name'};
2097: my $udom=$ENV{'user.domain'};
2098:
2099: unless ($symb) { return ''; }
2100: my $result='';
2101:
2102: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2103:
2104: # ----------------------------------------------------- Cascading lookup scheme
2105: my $rwhat=$what;
2106: $what=~s/^parameter\_//;
2107: $what=~s/\_/\./;
2108:
2109: my $symbparm=$symb.'.'.$what;
2110: my $mapparm=$mapname.'___(all).'.$what;
2111: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2112:
2113: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2114: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2115: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2116:
2117: my $courselevel= $usercourseprefix.'.'.$what;
2118: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2119: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2120:
2121: my $useropt = $self->{USER_OPT};
2122: my $courseopt = $self->{COURSE_OPT};
2123: my $parmhash = $self->{PARM_HASH};
2124:
2125: # ---------------------------------------------------------- first, check user
2126: if ($uname and defined($useropt)) {
2127: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2128: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2129: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2130: }
2131:
2132: # ------------------------------------------------------- second, check course
2133: if ($csec and defined($courseopt)) {
2134: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2135: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2136: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2137: }
2138:
2139: if (defined($courseopt)) {
2140: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2141: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2142: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2143: }
2144:
2145: # ----------------------------------------------------- third, check map parms
2146:
2147: my $thisparm=$$parmhash{$symbparm};
2148: if (defined($thisparm)) { return $thisparm; }
2149:
2150: # ----------------------------------------------------- fourth , check default
2151:
2152: my $meta_rwhat=$rwhat;
2153: $meta_rwhat=~s/\./_/g;
2154: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2155: if (defined($default)) { return $default}
2156: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2157: if (defined($default)) { return $default}
2158:
2159: # --------------------------------------------------- fifth , cascade up parts
2160:
2161: my ($space,@qualifier)=split(/\./,$rwhat);
2162: my $qualifier=join('.',@qualifier);
2163: unless ($space eq '0') {
2164: my @parts=split(/_/,$space);
2165: my $id=pop(@parts);
2166: my $part=join('_',@parts);
2167: if ($part eq '') { $part='0'; }
2168: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2169: if (defined($partgeneral)) { return $partgeneral; }
2170: }
2171: if ($recurse) { return undef; }
2172: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2173: if (defined($pack_def)) { return $pack_def; }
2174: return '';
2175: }
2176:
2177: =pod
2178:
2179: =item * B<getResourceByUrl>(url):
2180:
2181: Retrieves a resource object by URL of the resource. If passed a
2182: resource object, it will simply return it, so it is safe to use this
2183: method in code like "$res = $navmap->getResourceByUrl($res)", if
2184: you're not sure if $res is already an object, or just a URL. If the
2185: resource appears multiple times in the course, only the first instance
2186: will be returned. As a result, this is probably useful only for maps.
2187:
2188: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2189:
2190: The map is a specification of a map to retreive the resources from,
2191: either as a url or as an object. The filterFunc is a reference to a
2192: function that takes a resource object as its one argument and returns
2193: true if the resource should be included, or false if it should not
2194: be. If recursive is true, the map will be recursively examined,
2195: otherwise it will not be. If bailout is true, the function will return
2196: as soon as it finds a resource, if false it will finish. By default,
2197: the map is the top-level map of the course, filterFunc is a function
2198: that always returns 1, recursive is true, bailout is false. The
2199: resources will be returned in a list containing the resource objects
2200: for the corresponding resources, with B<no structure information> in
2201: the list; regardless of branching, recursion, etc., it will be a flat
2202: list.
2203:
2204: Thus, this is suitable for cases where you don't want the structure,
2205: just a list of all resources. It is also suitable for finding out how
2206: many resources match a given description; for this use, if all you
2207: want to know is if I<any> resources match the description, the bailout
2208: parameter will allow you to avoid potentially expensive enumeration of
2209: all matching resources.
2210:
2211: =item * B<hasResource>(map, filterFunc, recursive):
2212:
2213: Convience method for
2214:
2215: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2216:
2217: which will tell whether the map has resources matching the description
2218: in the filter function.
2219:
2220: =cut
2221:
2222: sub getResourceByUrl {
2223: my $self = shift;
2224: my $resUrl = shift;
2225:
2226: if (ref($resUrl)) { return $resUrl; }
2227:
2228: $resUrl = &Apache::lonnet::clutter($resUrl);
2229: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2230: if ($resId =~ /,/) {
2231: $resId = (split (/,/, $resId))[0];
2232: }
2233: if (!$resId) { return ''; }
2234: return $self->getById($resId);
2235: }
2236:
2237: sub retrieveResources {
2238: my $self = shift;
2239: my $map = shift;
2240: my $filterFunc = shift;
2241: if (!defined ($filterFunc)) {
2242: $filterFunc = sub {return 1;};
2243: }
2244: my $recursive = shift;
2245: if (!defined($recursive)) { $recursive = 1; }
2246: my $bailout = shift;
2247: if (!defined($bailout)) { $bailout = 0; }
2248:
2249: # Create the necessary iterator.
2250: if (!ref($map)) { # assume it's a url of a map.
2251: $map = $self->getResourceByUrl($map);
2252: }
2253:
2254: # If nothing was passed, assume top-level map
2255: if (!$map) {
2256: $map = $self->getById('0.0');
2257: }
2258:
2259: # Check the map's validity.
2260: if (!$map->is_map()) {
2261: # Oh, to throw an exception.... how I'd love that!
2262: return ();
2263: }
2264:
2265: # Get an iterator.
2266: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2267: undef, $recursive);
2268:
2269: my @resources = ();
2270:
2271: # Run down the iterator and collect the resources.
2272: my $curRes;
2273:
2274: while ($curRes = $it->next()) {
2275: if (ref($curRes)) {
2276: if (!&$filterFunc($curRes)) {
2277: next;
2278: }
2279:
2280: push @resources, $curRes;
2281:
2282: if ($bailout) {
2283: return @resources;
2284: }
2285: }
2286:
2287: }
2288:
2289: return @resources;
2290: }
2291:
2292: sub hasResource {
2293: my $self = shift;
2294: my $map = shift;
2295: my $filterFunc = shift;
2296: my $recursive = shift;
2297:
2298: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2299: }
2300:
2301: 1;
2302:
2303: package Apache::lonnavmaps::iterator;
2304:
2305: =pod
2306:
2307: =back
2308:
2309: =head1 Object: navmap Iterator
2310:
2311: An I<iterator> encapsulates the logic required to traverse a data
2312: structure. navmap uses an iterator to traverse the course map
2313: according to the criteria you wish to use.
2314:
2315: To obtain an iterator, call the B<getIterator>() function of a
2316: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2317: directly.) This will return a reference to the iterator:
2318:
2319: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2320:
2321: To get the next thing from the iterator, call B<next>:
2322:
2323: C<my $nextThing = $resourceIterator-E<gt>next()>
2324:
2325: getIterator behaves as follows:
2326:
2327: =over 4
2328:
2329: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2330:
2331: All parameters are optional. firstResource is a resource reference
2332: corresponding to where the iterator should start. It defaults to
2333: navmap->firstResource() for the corresponding nav map. finishResource
2334: corresponds to where you want the iterator to end, defaulting to
2335: navmap->finishResource(). filterHash is a hash used as a set
2336: containing strings representing the resource IDs, defaulting to
2337: empty. Condition is a 1 or 0 that sets what to do with the filter
2338: hash: If a 0, then only resources that exist IN the filterHash will be
2339: recursed on. If it is a 1, only resources NOT in the filterHash will
2340: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2341: false (default), the iterator will only return the first level of map
2342: that is not just a single, 'redirecting' map. If true, the iterator
2343: will return all information, starting with the top-level map,
2344: regardless of content. returnTopMap, if true (default false), will
2345: cause the iterator to return the top-level map object (resource 0.0)
2346: before anything else.
2347:
2348: Thus, by default, only top-level resources will be shown. Change the
2349: condition to a 1 without changing the hash, and all resources will be
2350: shown. Changing the condition to 1 and including some values in the
2351: hash will allow you to selectively suppress parts of the navmap, while
2352: leaving it on 0 and adding things to the hash will allow you to
2353: selectively add parts of the nav map. See the handler code for
2354: examples.
2355:
2356: The iterator will return either a reference to a resource object, or a
2357: token representing something in the map, such as the beginning of a
2358: new branch. The possible tokens are:
2359:
2360: =over 4
2361:
2362: =item * B<END_ITERATOR>:
2363:
2364: The iterator has returned all that it's going to. Further calls to the
2365: iterator will just produce more of these. This is a "false" value, and
2366: is the only false value the iterator which will be returned, so it can
2367: be used as a loop sentinel.
2368:
2369: =item * B<BEGIN_MAP>:
2370:
2371: A new map is being recursed into. This is returned I<after> the map
2372: resource itself is returned.
2373:
2374: =item * B<END_MAP>:
2375:
2376: The map is now done.
2377:
2378: =item * B<BEGIN_BRANCH>:
2379:
2380: A branch is now starting. The next resource returned will be the first
2381: in that branch.
2382:
2383: =item * B<END_BRANCH>:
2384:
2385: The branch is now done.
2386:
2387: =back
2388:
2389: The tokens are retreivable via methods on the iterator object, i.e.,
2390: $iterator->END_MAP.
2391:
2392: Maps can contain empty resources. The iterator will automatically skip
2393: over such resources, but will still treat the structure
2394: correctly. Thus, a complicated map with several branches, but
2395: consisting entirely of empty resources except for one beginning or
2396: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2397: but only one resource will be returned.
2398:
2399: =back
2400:
2401: =head2 Normal Usage
2402:
2403: Normal usage of the iterator object is to do the following:
2404:
2405: my $it = $navmap->getIterator([your params here]);
2406: my $curRes;
2407: while ($curRes = $it->next()) {
2408: [your logic here]
2409: }
2410:
2411: Note that inside of the loop, it's frequently useful to check if
2412: "$curRes" is a reference or not with the reference function; only
2413: resource objects will be references, and any non-references will
2414: be the tokens described above.
2415:
2416: Also note there is some old code floating around that trys to track
2417: the depth of the iterator to see when it's done; do not copy that
2418: code. It is difficult to get right and harder to understand then
2419: this. They should be migrated to this new style.
2420:
2421: =cut
2422:
2423: # Here are the tokens for the iterator:
2424:
2425: sub END_ITERATOR { return 0; }
2426: sub BEGIN_MAP { return 1; } # begining of a new map
2427: sub END_MAP { return 2; } # end of the map
2428: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2429: sub END_BRANCH { return 4; } # end of a branch
2430: sub FORWARD { return 1; } # go forward
2431: sub BACKWARD { return 2; }
2432:
2433: sub min {
2434: (my $a, my $b) = @_;
2435: if ($a < $b) { return $a; } else { return $b; }
2436: }
2437:
2438: sub new {
2439: # magic invocation to create a class instance
2440: my $proto = shift;
2441: my $class = ref($proto) || $proto;
2442: my $self = {};
2443:
2444: $self->{NAV_MAP} = shift;
2445: return undef unless ($self->{NAV_MAP});
2446:
2447: # Handle the parameters
2448: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2449: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2450:
2451: # If the given resources are just the ID of the resource, get the
2452: # objects
2453: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2454: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2455: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2456: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2457:
2458: $self->{FILTER} = shift;
2459:
2460: # A hash, used as a set, of resource already seen
2461: $self->{ALREADY_SEEN} = shift;
2462: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2463: $self->{CONDITION} = shift;
2464:
2465: # Do we want to automatically follow "redirection" maps?
2466: $self->{FORCE_TOP} = shift;
2467:
2468: # Do we want to return the top-level map object (resource 0.0)?
2469: $self->{RETURN_0} = shift;
2470: # have we done that yet?
2471: $self->{HAVE_RETURNED_0} = 0;
2472:
2473: # Now, we need to pre-process the map, by walking forward and backward
2474: # over the parts of the map we're going to look at.
2475:
2476: # The processing steps are exactly the same, except for a few small
2477: # changes, so I bundle those up in the following list of two elements:
2478: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2479: # first_resource).
2480: # This prevents writing nearly-identical code twice.
2481: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2482: 'FIRST_RESOURCE'],
2483: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2484: 'FINISH_RESOURCE'] );
2485:
2486: my $maxDepth = 0; # tracks max depth
2487:
2488: # If there is only one resource in this map, and it's a map, we
2489: # want to remember that, so the user can ask for the first map
2490: # that isn't just a redirector.
2491: my $resource; my $resourceCount = 0;
2492:
2493: # Documentation on this algorithm can be found in the CVS repository at
2494: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2495: # in that file.
2496: # **1**
2497:
2498: foreach my $pass (@iterations) {
2499: my $direction = $pass->[0];
2500: my $valName = $pass->[1];
2501: my $nextResourceMethod = $pass->[2];
2502: my $firstResourceName = $pass->[3];
2503:
2504: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2505: $self->{FIRST_RESOURCE},
2506: $self->{FINISH_RESOURCE},
2507: {}, undef, 0, $direction);
2508:
2509: # prime the recursion
2510: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2511: $iterator->next();
2512: my $curRes = $iterator->next();
2513: my $depth = 1;
2514: while ($depth > 0) {
2515: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2516: if ($curRes == $iterator->END_MAP()) { $depth--; }
2517:
2518: if (ref($curRes)) {
2519: # If there's only one resource, this will save it
2520: # we have to filter empty resources from consideration here,
2521: # or even "empty", redirecting maps have two (start & finish)
2522: # or three (start, finish, plus redirector)
2523: if($direction == FORWARD && $curRes->src()) {
2524: $resource = $curRes; $resourceCount++;
2525: }
2526: my $resultingVal = $curRes->{DATA}->{$valName};
2527: my $nextResources = $curRes->$nextResourceMethod();
2528: my $nextCount = scalar(@{$nextResources});
2529:
2530: if ($nextCount == 1) { # **3**
2531: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2532: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2533: }
2534:
2535: if ($nextCount > 1) { # **4**
2536: foreach my $res (@{$nextResources}) {
2537: my $current = $res->{DATA}->{$valName} || 999999999;
2538: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2539: }
2540: }
2541: }
2542:
2543: # Assign the final val (**2**)
2544: if (ref($curRes) && $direction == BACKWARD()) {
2545: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2546: $curRes->{DATA}->{BOT_UP_VAL});
2547:
2548: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2549: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2550: }
2551:
2552: $curRes = $iterator->next();
2553: }
2554: }
2555:
2556: # Check: Was this only one resource, a map?
2557: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2558: my $firstResource = $resource->map_start();
2559: my $finishResource = $resource->map_finish();
2560: return
2561: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2562: $finishResource, $self->{FILTER},
2563: $self->{ALREADY_SEEN},
2564: $self->{CONDITION}, 0);
2565:
2566: }
2567:
2568: # Set up some bookkeeping information.
2569: $self->{CURRENT_DEPTH} = 0;
2570: $self->{MAX_DEPTH} = $maxDepth;
2571: $self->{STACK} = [];
2572: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2573: $self->{FINISHED} = 0; # When true, the iterator has finished
2574:
2575: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2576: push @{$self->{STACK}}, [];
2577: }
2578:
2579: # Prime the recursion w/ the first resource **5**
2580: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2581: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2582:
2583: bless ($self);
2584:
2585: return $self;
2586: }
2587:
2588: sub next {
2589: my $self = shift;
2590: my $closeAllPages=shift;
2591: if ($self->{FINISHED}) {
2592: return END_ITERATOR();
2593: }
2594:
2595: # If we want to return the top-level map object, and haven't yet,
2596: # do so.
2597: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2598: $self->{HAVE_RETURNED_0} = 1;
2599: return $self->{NAV_MAP}->getById('0.0');
2600: }
2601:
2602: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2603: # grab the next from the recursive iterator
2604: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2605:
2606: # is it a begin or end map? If so, update the depth
2607: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2608: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2609:
2610: # Are we back at depth 0? If so, stop recursing
2611: if ($self->{RECURSIVE_DEPTH} == 0) {
2612: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2613: }
2614:
2615: return $next;
2616: }
2617:
2618: if (defined($self->{FORCE_NEXT})) {
2619: my $tmp = $self->{FORCE_NEXT};
2620: $self->{FORCE_NEXT} = undef;
2621: return $tmp;
2622: }
2623:
2624: # Have we not yet begun? If not, return BEGIN_MAP and
2625: # remember we've started.
2626: if ( !$self->{STARTED} ) {
2627: $self->{STARTED} = 1;
2628: return $self->BEGIN_MAP();
2629: }
2630:
2631: # Here's the guts of the iterator.
2632:
2633: # Find the next resource, if any.
2634: my $found = 0;
2635: my $i = $self->{MAX_DEPTH};
2636: my $newDepth;
2637: my $here;
2638: while ( $i >= 0 && !$found ) {
2639: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2640: $here = pop @{$self->{STACK}->[$i]}; # **7**
2641: $found = 1;
2642: $newDepth = $i;
2643: }
2644: $i--;
2645: }
2646:
2647: # If we still didn't find anything, we're done.
2648: if ( !$found ) {
2649: # We need to get back down to the correct branch depth
2650: if ( $self->{CURRENT_DEPTH} > 0 ) {
2651: $self->{CURRENT_DEPTH}--;
2652: return END_BRANCH();
2653: } else {
2654: $self->{FINISHED} = 1;
2655: return END_MAP();
2656: }
2657: }
2658:
2659: # If this is not a resource, it must be an END_BRANCH marker we want
2660: # to return directly.
2661: if (!ref($here)) { # **8**
2662: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2663: $self->{CURRENT_DEPTH}--;
2664: return $here;
2665: }
2666: }
2667:
2668: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2669: $self->{HERE} = $here;
2670:
2671: # Get to the right level
2672: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2673: push @{$self->{STACK}->[$newDepth]}, $here;
2674: $self->{CURRENT_DEPTH}--;
2675: return END_BRANCH();
2676: }
2677: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2678: push @{$self->{STACK}->[$newDepth]}, $here;
2679: $self->{CURRENT_DEPTH}++;
2680: return BEGIN_BRANCH();
2681: }
2682:
2683: # If we made it here, we have the next resource, and we're at the
2684: # right branch level. So let's examine the resource for where
2685: # we can get to from here.
2686:
2687: # So we need to look at all the resources we can get to from here,
2688: # categorize them if we haven't seen them, remember if we have a new
2689: my $nextUnfiltered = $here->getNext();
2690: my $maxDepthAdded = -1;
2691:
2692: for (@$nextUnfiltered) {
2693: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2694: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2695: push @{$self->{STACK}->[$depth]}, $_;
2696: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2697: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2698: }
2699: }
2700:
2701: # Is this the end of a branch? If so, all of the resources examined above
2702: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2703: # marker onto the stack so we don't forget.
2704: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2705: # BC branch and gets to C, it will see F as the only next resource, but it's
2706: # one level lower. Thus, this is the end of the branch, since there are no
2707: # more resources added to this level or above.
2708: # We don't do this if the examined resource is the finish resource,
2709: # because the condition given above is true, but the "END_MAP" will
2710: # take care of things and we should already be at depth 0.
2711: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2712: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2713: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2714: }
2715:
2716: # That ends the main iterator logic. Now, do we want to recurse
2717: # down this map (if this resource is a map)?
2718: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
2719: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2720: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2721: my $firstResource = $self->{HERE}->map_start();
2722: my $finishResource = $self->{HERE}->map_finish();
2723:
2724: $self->{RECURSIVE_ITERATOR} =
2725: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2726: $finishResource, $self->{FILTER},
2727: $self->{ALREADY_SEEN}, $self->{CONDITION});
2728: }
2729:
2730: # If this is a blank resource, don't actually return it.
2731: # Should you ever find you need it, make sure to add an option to the code
2732: # that you can use; other things depend on this behavior.
2733: my $browsePriv = $self->{HERE}->browsePriv();
2734: if (!$self->{HERE}->src() ||
2735: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2736: return $self->next($closeAllPages);
2737: }
2738:
2739: return $self->{HERE};
2740:
2741: }
2742:
2743: =pod
2744:
2745: The other method available on the iterator is B<getStack>, which
2746: returns an array populated with the current 'stack' of maps, as
2747: references to the resource objects. Example: This is useful when
2748: making the navigation map, as we need to check whether we are under a
2749: page map to see if we need to link directly to the resource, or to the
2750: page. The first elements in the array will correspond to the top of
2751: the stack (most inclusive map).
2752:
2753: =cut
2754:
2755: sub getStack {
2756: my $self=shift;
2757:
2758: my @stack;
2759:
2760: $self->populateStack(\@stack);
2761:
2762: return \@stack;
2763: }
2764:
2765: # Private method: Calls the iterators recursively to populate the stack.
2766: sub populateStack {
2767: my $self=shift;
2768: my $stack = shift;
2769:
2770: push @$stack, $self->{HERE} if ($self->{HERE});
2771:
2772: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2773: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2774: }
2775: }
2776:
2777: 1;
2778:
2779: package Apache::lonnavmaps::DFSiterator;
2780:
2781: # Not documented in the perldoc: This is a simple iterator that just walks
2782: # through the nav map and presents the resources in a depth-first search
2783: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2784: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2785: # useful for pre-processing of some kind, and is in fact used by the main
2786: # iterator that way, but that's about it.
2787: # One could imagine merging this into the init routine of the main iterator,
2788: # but this might as well be left separate, since it is possible some other
2789: # use might be found for it. - Jeremy
2790:
2791: # Unlike the main iterator, this DOES return all resources, even blank ones.
2792: # The main iterator needs them to correctly preprocess the map.
2793:
2794: sub BEGIN_MAP { return 1; } # begining of a new map
2795: sub END_MAP { return 2; } # end of the map
2796: sub FORWARD { return 1; } # go forward
2797: sub BACKWARD { return 2; }
2798:
2799: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2800: # filter hash ref (or undef), already seen hash or undef, condition
2801: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2802: sub new {
2803: # magic invocation to create a class instance
2804: my $proto = shift;
2805: my $class = ref($proto) || $proto;
2806: my $self = {};
2807:
2808: $self->{NAV_MAP} = shift;
2809: return undef unless ($self->{NAV_MAP});
2810:
2811: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2812: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2813:
2814: # If the given resources are just the ID of the resource, get the
2815: # objects
2816: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2817: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2818: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2819: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2820:
2821: $self->{FILTER} = shift;
2822:
2823: # A hash, used as a set, of resource already seen
2824: $self->{ALREADY_SEEN} = shift;
2825: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2826: $self->{CONDITION} = shift;
2827: $self->{DIRECTION} = shift || FORWARD();
2828:
2829: # Flag: Have we started yet?
2830: $self->{STARTED} = 0;
2831:
2832: # Should we continue calling the recursive iterator, if any?
2833: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2834: # The recursive iterator, if any
2835: $self->{RECURSIVE_ITERATOR} = undef;
2836: # Are we recursing on a map, or a branch?
2837: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2838: # And the count of how deep it is, so that this iterator can keep track of
2839: # when to pick back up again.
2840: $self->{RECURSIVE_DEPTH} = 0;
2841:
2842: # For keeping track of our branches, we maintain our own stack
2843: $self->{STACK} = [];
2844:
2845: # Start with the first resource
2846: if ($self->{DIRECTION} == FORWARD) {
2847: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2848: } else {
2849: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2850: }
2851:
2852: bless($self);
2853: return $self;
2854: }
2855:
2856: sub next {
2857: my $self = shift;
2858:
2859: # Are we using a recursive iterator? If so, pull from that and
2860: # watch the depth; we want to resume our level at the correct time.
2861: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2862: # grab the next from the recursive iterator
2863: my $next = $self->{RECURSIVE_ITERATOR}->next();
2864:
2865: # is it a begin or end map? Update depth if so
2866: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2867: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2868:
2869: # Are we back at depth 0? If so, stop recursing.
2870: if ($self->{RECURSIVE_DEPTH} == 0) {
2871: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2872: }
2873:
2874: return $next;
2875: }
2876:
2877: # Is there a current resource to grab? If not, then return
2878: # END_MAP, which will end the iterator.
2879: if (scalar(@{$self->{STACK}}) == 0) {
2880: return $self->END_MAP();
2881: }
2882:
2883: # Have we not yet begun? If not, return BEGIN_MAP and
2884: # remember that we've started.
2885: if ( !$self->{STARTED} ) {
2886: $self->{STARTED} = 1;
2887: return $self->BEGIN_MAP;
2888: }
2889:
2890: # Get the next resource in the branch
2891: $self->{HERE} = pop @{$self->{STACK}};
2892:
2893: # remember that we've seen this, so we don't return it again later
2894: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2895:
2896: # Get the next possible resources
2897: my $nextUnfiltered;
2898: if ($self->{DIRECTION} == FORWARD()) {
2899: $nextUnfiltered = $self->{HERE}->getNext();
2900: } else {
2901: $nextUnfiltered = $self->{HERE}->getPrevious();
2902: }
2903: my $next = [];
2904:
2905: # filter the next possibilities to remove things we've
2906: # already seen.
2907: foreach (@$nextUnfiltered) {
2908: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2909: push @$next, $_;
2910: }
2911: }
2912:
2913: while (@$next) {
2914: # copy the next possibilities over to the stack
2915: push @{$self->{STACK}}, shift @$next;
2916: }
2917:
2918: # If this is a map and we want to recurse down it... (not filtered out)
2919: if ($self->{HERE}->is_map() &&
2920: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2921: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2922: my $firstResource = $self->{HERE}->map_start();
2923: my $finishResource = $self->{HERE}->map_finish();
2924:
2925: $self->{RECURSIVE_ITERATOR} =
2926: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2927: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2928: $self->{CONDITION}, $self->{DIRECTION});
2929: }
2930:
2931: return $self->{HERE};
2932: }
2933:
2934: # Identical to the full iterator methods of the same name. Hate to copy/paste
2935: # but I also hate to "inherit" either iterator from the other.
2936:
2937: sub getStack {
2938: my $self=shift;
2939:
2940: my @stack;
2941:
2942: $self->populateStack(\@stack);
2943:
2944: return \@stack;
2945: }
2946:
2947: # Private method: Calls the iterators recursively to populate the stack.
2948: sub populateStack {
2949: my $self=shift;
2950: my $stack = shift;
2951:
2952: push @$stack, $self->{HERE} if ($self->{HERE});
2953:
2954: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2955: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2956: }
2957: }
2958:
2959: 1;
2960:
2961: package Apache::lonnavmaps::resource;
2962:
2963: use Apache::lonnet;
2964:
2965: =pod
2966:
2967: =head1 Object: resource
2968:
2969: X<resource, navmap object>
2970: A resource object encapsulates a resource in a resource map, allowing
2971: easy manipulation of the resource, querying the properties of the
2972: resource (including user properties), and represents a reference that
2973: can be used as the canonical representation of the resource by
2974: lonnavmap clients like renderers.
2975:
2976: A resource only makes sense in the context of a navmap, as some of the
2977: data is stored in the navmap object.
2978:
2979: You will probably never need to instantiate this object directly. Use
2980: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2981: starting resource.
2982:
2983: Resource objects respect the parameter_hiddenparts, which suppresses
2984: various parts according to the wishes of the map author. As of this
2985: writing, there is no way to override this parameter, and suppressed
2986: parts will never be returned, nor will their response types or ids be
2987: stored.
2988:
2989: =head2 Overview
2990:
2991: A B<Resource> is the most granular type of object in LON-CAPA that can
2992: be included in a course. It can either be a particular resource, like
2993: an HTML page, external resource, problem, etc., or it can be a
2994: container sequence, such as a "page" or a "map".
2995:
2996: To see a sequence from the user's point of view, please see the
2997: B<Creating a Course: Maps and Sequences> chapter of the Author's
2998: Manual.
2999:
3000: A Resource Object, once obtained from a navmap object via a B<getBy*>
3001: method of the navmap, or from an iterator, allows you to query
3002: information about that resource.
3003:
3004: Generally, you do not ever want to create a resource object yourself,
3005: so creation has been left undocumented. Always retrieve resources
3006: from navmap objects.
3007:
3008: =head3 Identifying Resources
3009:
3010: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3011: unique to that resource for a given course. X<resource ID, in big hash>
3012: The Resource ID has the form #.#, where the first number is the same
3013: for every resource in a map, and the second is unique. For instance,
3014: for a course laid out like this:
3015:
3016: * Problem 1
3017: * Map
3018: * Resource 2
3019: * Resource 3
3020:
3021: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3022: C<Resource 3> will share a first number. The second number may end up
3023: re-used between the two groups.
3024:
3025: The resource ID is only used in the big hash, but can be used in the
3026: context of a course to identify a resource easily. (For instance, the
3027: printing system uses it to record which resources from a sequence you
3028: wish to print.)
3029:
3030: X<symb> X<resource, symb>
3031: All resources also have B<symb>s, which uniquely identify a resource
3032: in a course. Many internal LON-CAPA functions expect a symb. A symb
3033: carries along with it the URL of the resource, and the map it appears
3034: in. Symbs are much larger then resource IDs.
3035:
3036: =cut
3037:
3038: sub new {
3039: # magic invocation to create a class instance
3040: my $proto = shift;
3041: my $class = ref($proto) || $proto;
3042: my $self = {};
3043:
3044: $self->{NAV_MAP} = shift;
3045: $self->{ID} = shift;
3046:
3047: # Store this new resource in the parent nav map's cache.
3048: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3049: $self->{RESOURCE_ERROR} = 0;
3050:
3051: # A hash that can be used by two-pass algorithms to store data
3052: # about this resource in. Not used by the resource object
3053: # directly.
3054: $self->{DATA} = {};
3055:
3056: bless($self);
3057:
3058: return $self;
3059: }
3060:
3061: # private function: simplify the NAV_HASH lookups we keep doing
3062: # pass the name, and to automatically append my ID, pass a true val on the
3063: # second param
3064: sub navHash {
3065: my $self = shift;
3066: my $param = shift;
3067: my $id = shift;
3068: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3069: }
3070:
3071: =pod
3072:
3073: =head2 Methods
3074:
3075: Once you have a resource object, here's what you can do with it:
3076:
3077: =head3 Attribute Retrieval
3078:
3079: Every resource has certain attributes that can be retrieved and used:
3080:
3081: =over 4
3082:
3083: =item * B<ID>: Every resource has an ID that is unique for that
3084: resource in the course it is in. The ID is actually in the hash
3085: representing the resource, so for a resource object $res, obtain
3086: it via C<$res->{ID}).
3087:
3088: =item * B<compTitle>:
3089:
3090: Returns a "composite title", that is equal to $res->title() if the
3091: resource has a title, and is otherwise the last part of the URL (e.g.,
3092: "problem.problem").
3093:
3094: =item * B<ext>:
3095:
3096: Returns true if the resource is external.
3097:
3098: =item * B<kind>:
3099:
3100: Returns the kind of the resource from the compiled nav map.
3101:
3102: =item * B<randomout>:
3103:
3104: Returns true if this resource was chosen to NOT be shown to the user
3105: by the random map selection feature. In other words, this is usually
3106: false.
3107:
3108: =item * B<randompick>:
3109:
3110: Returns true for a map if the randompick feature is being used on the
3111: map. (?)
3112:
3113: =item * B<src>:
3114:
3115: Returns the source for the resource.
3116:
3117: =item * B<symb>:
3118:
3119: Returns the symb for the resource.
3120:
3121: =item * B<title>:
3122:
3123: Returns the title of the resource.
3124:
3125: =back
3126:
3127: =cut
3128:
3129: # These info functions can be used directly, as they don't return
3130: # resource information.
3131: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3132: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3133: sub from { my $self=shift; return $self->navHash("from_", 1); }
3134: # considered private and undocumented
3135: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3136: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3137: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3138: sub randompick {
3139: my $self = shift;
3140: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3141: '.0.parameter_randompick'};
3142: }
3143: sub src {
3144: my $self=shift;
3145: return $self->navHash("src_", 1);
3146: }
3147: sub symb {
3148: my $self=shift;
3149: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3150: my $symbSrc = &Apache::lonnet::declutter($self->src());
3151: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3152: . '___' . $second . '___' . $symbSrc;
3153: return &Apache::lonnet::symbclean($symb);
3154: }
3155: sub title {
3156: my $self=shift;
3157: if ($self->{ID} eq '0.0') {
3158: # If this is the top-level map, return the title of the course
3159: # since this map can not be titled otherwise.
3160: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3161: }
3162: return $self->navHash("title_", 1); }
3163: # considered private and undocumented
3164: sub to { my $self=shift; return $self->navHash("to_", 1); }
3165: sub compTitle {
3166: my $self = shift;
3167: my $title = $self->title();
3168: $title=~s/\&colon\;/\:/gs;
3169: if (!$title) {
3170: $title = $self->src();
3171: $title = substr($title, rindex($title, '/') + 1);
3172: }
3173: return $title;
3174: }
3175: =pod
3176:
3177: B<Predicate Testing the Resource>
3178:
3179: These methods are shortcuts to deciding if a given resource has a given property.
3180:
3181: =over 4
3182:
3183: =item * B<is_map>:
3184:
3185: Returns true if the resource is a map type.
3186:
3187: =item * B<is_problem>:
3188:
3189: Returns true if the resource is a problem type, false
3190: otherwise. (Looks at the extension on the src field; might need more
3191: to work correctly.)
3192:
3193: =item * B<is_page>:
3194:
3195: Returns true if the resource is a page.
3196:
3197: =item * B<is_sequence>:
3198:
3199: Returns true if the resource is a sequence.
3200:
3201: =back
3202:
3203: =cut
3204:
3205: sub hasResource {
3206: my $self = shift;
3207: return $self->{NAV_MAP}->hasResource(@_);
3208: }
3209:
3210: sub retrieveResources {
3211: my $self = shift;
3212: return $self->{NAV_MAP}->retrieveResources(@_);
3213: }
3214:
3215: sub is_html {
3216: my $self=shift;
3217: my $src = $self->src();
3218: return ($src =~ /html$/);
3219: }
3220: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3221: sub is_page {
3222: my $self=shift;
3223: my $src = $self->src();
3224: return $self->navHash("is_map_", 1) &&
3225: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3226: }
3227: sub is_problem {
3228: my $self=shift;
3229: my $src = $self->src();
3230: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3231: }
3232: sub contains_problem {
3233: my $self=shift;
3234: if ($self->is_page()) {
3235: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3236: return $hasProblem;
3237: }
3238: return 0;
3239: }
3240: sub is_sequence {
3241: my $self=shift;
3242: my $src = $self->src();
3243: return $self->navHash("is_map_", 1) &&
3244: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3245: }
3246: sub is_survey {
3247: my $self = shift();
3248: my $part = shift();
3249: if ($self->parmval('type',$part) eq 'survey') {
3250: return 1;
3251: }
3252: if ($self->src() =~ /\.(survey)$/) {
3253: return 1;
3254: }
3255: return 0;
3256: }
3257:
3258: # Private method: Shells out to the parmval in the nav map, handler parts.
3259: sub parmval {
3260: my $self = shift;
3261: my $what = shift;
3262: my $part = shift;
3263: if (!defined($part)) {
3264: $part = '0';
3265: }
3266: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3267: }
3268:
3269: =pod
3270:
3271: B<Map Methods>
3272:
3273: These methods are useful for getting information about the map
3274: properties of the resource, if the resource is a map (B<is_map>).
3275:
3276: =over 4
3277:
3278: =item * B<map_finish>:
3279:
3280: Returns a reference to a resource object corresponding to the finish
3281: resource of the map.
3282:
3283: =item * B<map_pc>:
3284:
3285: Returns the pc value of the map, which is the first number that
3286: appears in the resource ID of the resources in the map, and is the
3287: number that appears around the middle of the symbs of the resources in
3288: that map.
3289:
3290: =item * B<map_start>:
3291:
3292: Returns a reference to a resource object corresponding to the start
3293: resource of the map.
3294:
3295: =item * B<map_type>:
3296:
3297: Returns a string with the type of the map in it.
3298:
3299: =back
3300:
3301: =cut
3302:
3303: sub map_finish {
3304: my $self = shift;
3305: my $src = $self->src();
3306: $src = Apache::lonnet::clutter($src);
3307: my $res = $self->navHash("map_finish_$src", 0);
3308: $res = $self->{NAV_MAP}->getById($res);
3309: return $res;
3310: }
3311: sub map_pc {
3312: my $self = shift;
3313: my $src = $self->src();
3314: return $self->navHash("map_pc_$src", 0);
3315: }
3316: sub map_start {
3317: my $self = shift;
3318: my $src = $self->src();
3319: $src = Apache::lonnet::clutter($src);
3320: my $res = $self->navHash("map_start_$src", 0);
3321: $res = $self->{NAV_MAP}->getById($res);
3322: return $res;
3323: }
3324: sub map_type {
3325: my $self = shift;
3326: my $pc = $self->map_pc();
3327: return $self->navHash("map_type_$pc", 0);
3328: }
3329:
3330: #####
3331: # Property queries
3332: #####
3333:
3334: # These functions will be responsible for returning the CORRECT
3335: # VALUE for the parameter, no matter what. So while they may look
3336: # like direct calls to parmval, they can be more then that.
3337: # So, for instance, the duedate function should use the "duedatetype"
3338: # information, rather then the resource object user.
3339:
3340: =pod
3341:
3342: =head2 Resource Parameters
3343:
3344: In order to use the resource parameters correctly, the nav map must
3345: have been instantiated with genCourseAndUserOptions set to true, so
3346: the courseopt and useropt is read correctly. Then, you can call these
3347: functions to get the relevant parameters for the resource. Each
3348: function defaults to part "0", but can be directed to another part by
3349: passing the part as the parameter.
3350:
3351: These methods are responsible for getting the parameter correct, not
3352: merely reflecting the contents of the GDBM hashes. As we move towards
3353: dates relative to other dates, these methods should be updated to
3354: reflect that. (Then, anybody using these methods will not have to update
3355: their code.)
3356:
3357: =over 4
3358:
3359: =item * B<acc>:
3360:
3361: Get the Client IP/Name Access Control information.
3362:
3363: =item * B<answerdate>:
3364:
3365: Get the answer-reveal date for the problem.
3366:
3367: =item * B<awarded>:
3368:
3369: Gets the awarded value for the problem part. Requires genUserData set to
3370: true when the navmap object was created.
3371:
3372: =item * B<duedate>:
3373:
3374: Get the due date for the problem.
3375:
3376: =item * B<tries>:
3377:
3378: Get the number of tries the student has used on the problem.
3379:
3380: =item * B<maxtries>:
3381:
3382: Get the number of max tries allowed.
3383:
3384: =item * B<opendate>:
3385:
3386: Get the open date for the problem.
3387:
3388: =item * B<sig>:
3389:
3390: Get the significant figures setting.
3391:
3392: =item * B<tol>:
3393:
3394: Get the tolerance for the problem.
3395:
3396: =item * B<tries>:
3397:
3398: Get the number of tries the user has already used on the problem.
3399:
3400: =item * B<type>:
3401:
3402: Get the question type for the problem.
3403:
3404: =item * B<weight>:
3405:
3406: Get the weight for the problem.
3407:
3408: =back
3409:
3410: =cut
3411:
3412: sub acc {
3413: (my $self, my $part) = @_;
3414: return $self->parmval("acc", $part);
3415: }
3416: sub answerdate {
3417: (my $self, my $part) = @_;
3418: # Handle intervals
3419: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3420: return $self->duedate($part) +
3421: $self->parmval("answerdate", $part);
3422: }
3423: return $self->parmval("answerdate", $part);
3424: }
3425: sub awarded {
3426: my $self = shift; my $part = shift;
3427: $self->{NAV_MAP}->get_user_data();
3428: if (!defined($part)) { $part = '0'; }
3429: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3430: }
3431: sub duedate {
3432: (my $self, my $part) = @_;
3433: my $interval=$self->parmval("interval", $part);
3434: if ($interval) {
3435: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3436: if ($first_access) { return ($first_access+$interval); }
3437: }
3438: return $self->parmval("duedate", $part);
3439: }
3440: sub maxtries {
3441: (my $self, my $part) = @_;
3442: return $self->parmval("maxtries", $part);
3443: }
3444: sub opendate {
3445: (my $self, my $part) = @_;
3446: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3447: return $self->duedate($part) -
3448: $self->parmval("opendate", $part);
3449: }
3450: return $self->parmval("opendate");
3451: }
3452: sub problemstatus {
3453: (my $self, my $part) = @_;
3454: return lc $self->parmval("problemstatus", $part);
3455: }
3456: sub sig {
3457: (my $self, my $part) = @_;
3458: return $self->parmval("sig", $part);
3459: }
3460: sub tol {
3461: (my $self, my $part) = @_;
3462: return $self->parmval("tol", $part);
3463: }
3464: sub tries {
3465: my $self = shift;
3466: my $tries = $self->queryRestoreHash('tries', shift);
3467: if (!defined($tries)) { return '0';}
3468: return $tries;
3469: }
3470: sub type {
3471: (my $self, my $part) = @_;
3472: return $self->parmval("type", $part);
3473: }
3474: sub weight {
3475: my $self = shift; my $part = shift;
3476: if (!defined($part)) { $part = '0'; }
3477: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3478: $self->symb(), $ENV{'user.domain'},
3479: $ENV{'user.name'},
3480: $ENV{'request.course.sec'});
3481:
3482: }
3483:
3484: # Multiple things need this
3485: sub getReturnHash {
3486: my $self = shift;
3487:
3488: if (!defined($self->{RETURN_HASH})) {
3489: my %tmpHash = &Apache::lonnet::restore($self->symb());
3490: $self->{RETURN_HASH} = \%tmpHash;
3491: }
3492: }
3493:
3494: ######
3495: # Status queries
3496: ######
3497:
3498: # These methods query the status of problems.
3499:
3500: # If we need to count parts, this function determines the number of
3501: # parts from the metadata. When called, it returns a reference to a list
3502: # of strings corresponding to the parts. (Thus, using it in a scalar context
3503: # tells you how many parts you have in the problem:
3504: # $partcount = scalar($resource->countParts());
3505: # Don't use $self->{PARTS} directly because you don't know if it's been
3506: # computed yet.
3507:
3508: =pod
3509:
3510: =head2 Resource misc
3511:
3512: Misc. functions for the resource.
3513:
3514: =over 4
3515:
3516: =item * B<hasDiscussion>:
3517:
3518: Returns a false value if there has been discussion since the user last
3519: logged in, true if there has. Always returns false if the discussion
3520: data was not extracted when the nav map was constructed.
3521:
3522: =item * B<getFeedback>:
3523:
3524: Gets the feedback for the resource and returns the raw feedback string
3525: for the resource, or the null string if there is no feedback or the
3526: email data was not extracted when the nav map was constructed. Usually
3527: used like this:
3528:
3529: for (split(/\,/, $res->getFeedback())) {
3530: my $link = &Apache::lonnet::escape($_);
3531: ...
3532:
3533: and use the link as appropriate.
3534:
3535: =cut
3536:
3537: sub hasDiscussion {
3538: my $self = shift;
3539: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3540: }
3541:
3542: sub getFeedback {
3543: my $self = shift;
3544: my $source = $self->src();
3545: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3546: return $self->{NAV_MAP}->getFeedback($source);
3547: }
3548:
3549: sub getErrors {
3550: my $self = shift;
3551: my $source = $self->src();
3552: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3553: return $self->{NAV_MAP}->getErrors($source);
3554: }
3555:
3556: =pod
3557:
3558: =item * B<parts>():
3559:
3560: Returns a list reference containing sorted strings corresponding to
3561: each part of the problem. Single part problems have only a part '0'.
3562: Multipart problems do not return their part '0', since they typically
3563: do not really matter.
3564:
3565: =item * B<countParts>():
3566:
3567: Returns the number of parts of the problem a student can answer. Thus,
3568: for single part problems, returns 1. For multipart, it returns the
3569: number of parts in the problem, not including psuedo-part 0.
3570:
3571: =item * B<multipart>():
3572:
3573: Returns true if the problem is multipart, false otherwise. Use this instead
3574: of countParts if all you want is multipart/not multipart.
3575:
3576: =item * B<responseType>($part):
3577:
3578: Returns the response type of the part, without the word "response" on the
3579: end. Example return values: 'string', 'essay', 'numeric', etc.
3580:
3581: =item * B<responseIds>($part):
3582:
3583: Retreives the response IDs for the given part as an array reference containing
3584: strings naming the response IDs. This may be empty.
3585:
3586: =back
3587:
3588: =cut
3589:
3590: sub parts {
3591: my $self = shift;
3592:
3593: if ($self->ext) { return []; }
3594:
3595: $self->extractParts();
3596: return $self->{PARTS};
3597: }
3598:
3599: sub countParts {
3600: my $self = shift;
3601:
3602: my $parts = $self->parts();
3603:
3604: # If I left this here, then it's not necessary.
3605: #my $delta = 0;
3606: #for my $part (@$parts) {
3607: # if ($part eq '0') { $delta--; }
3608: #}
3609:
3610: if ($self->{RESOURCE_ERROR}) {
3611: return 0;
3612: }
3613:
3614: return scalar(@{$parts}); # + $delta;
3615: }
3616:
3617: sub multipart {
3618: my $self = shift;
3619: return $self->countParts() > 1;
3620: }
3621:
3622: sub singlepart {
3623: my $self = shift;
3624: return $self->countParts() == 1;
3625: }
3626:
3627: sub responseType {
3628: my $self = shift;
3629: my $part = shift;
3630:
3631: $self->extractParts();
3632: if (defined($self->{RESPONSE_TYPES}->{$part})) {
3633: return @{$self->{RESPONSE_TYPES}->{$part}};
3634: } else {
3635: return undef;
3636: }
3637: }
3638:
3639: sub responseIds {
3640: my $self = shift;
3641: my $part = shift;
3642:
3643: $self->extractParts();
3644: if (defined($self->{RESPONSE_IDS}->{$part})) {
3645: return @{$self->{RESPONSE_IDS}->{$part}};
3646: } else {
3647: return undef;
3648: }
3649: }
3650:
3651: # Private function: Extracts the parts information, both part names and
3652: # part types, and saves it.
3653: sub extractParts {
3654: my $self = shift;
3655:
3656: return if (defined($self->{PARTS}));
3657: return if ($self->ext);
3658:
3659: $self->{PARTS} = [];
3660:
3661: my %parts;
3662:
3663: # Retrieve part count, if this is a problem
3664: if ($self->is_problem()) {
3665: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
3666: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3667:
3668: if ($partorder) {
3669: my @parts;
3670: for my $part (split (/,/,$partorder)) {
3671: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3672: push @parts, $part;
3673: $parts{$part} = 1;
3674: }
3675: }
3676: $self->{PARTS} = \@parts;
3677: } else {
3678: if (!$metadata) {
3679: $self->{RESOURCE_ERROR} = 1;
3680: $self->{PARTS} = [];
3681: $self->{PART_TYPE} = {};
3682: return;
3683: }
3684: foreach (split(/\,/,$metadata)) {
3685: if ($_ =~ /^part_(.*)$/) {
3686: my $part = $1;
3687: # This floods the logs if it blows up
3688: if (defined($parts{$part})) {
3689: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3690: }
3691:
3692: # check to see if part is turned off.
3693:
3694: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3695: $parts{$part} = 1;
3696: }
3697: }
3698: }
3699: my @sortedParts = sort keys %parts;
3700: $self->{PARTS} = \@sortedParts;
3701: }
3702:
3703:
3704: my %responseIdHash;
3705: my %responseTypeHash;
3706:
3707:
3708: # Init the responseIdHash
3709: foreach (@{$self->{PARTS}}) {
3710: $responseIdHash{$_} = [];
3711: }
3712:
3713: # Now, the unfortunate thing about this is that parts, part name, and
3714: # response id are delimited by underscores, but both the part
3715: # name and response id can themselves have underscores in them.
3716: # So we have to use our knowlege of part names to figure out
3717: # where the part names begin and end, and even then, it is possible
3718: # to construct ambiguous situations.
3719: foreach (split /,/, $metadata) {
3720: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3721: my $responseType = $1;
3722: my $partStuff = $2;
3723: my $partIdSoFar = '';
3724: my @partChunks = split /_/, $partStuff;
3725: my $i = 0;
3726: for ($i = 0; $i < scalar(@partChunks); $i++) {
3727: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3728: $partIdSoFar .= $partChunks[$i];
3729: if ($parts{$partIdSoFar}) {
3730: my @otherChunks = @partChunks[$i+1..$#partChunks];
3731: my $responseId = join('_', @otherChunks);
3732: push @{$responseIdHash{$partIdSoFar}}, $responseId;
3733: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
3734: }
3735: }
3736: }
3737: }
3738: $self->{RESPONSE_IDS} = \%responseIdHash;
3739: $self->{RESPONSE_TYPES} = \%responseTypeHash;
3740: }
3741:
3742: return;
3743: }
3744:
3745: =pod
3746:
3747: =head2 Resource Status
3748:
3749: Problem resources have status information, reflecting their various
3750: dates and completion statuses.
3751:
3752: There are two aspects to the status: the date-related information and
3753: the completion information.
3754:
3755: Idiomatic usage of these two methods would probably look something
3756: like
3757:
3758: foreach ($resource->parts()) {
3759: my $dateStatus = $resource->getDateStatus($_);
3760: my $completionStatus = $resource->getCompletionStatus($_);
3761:
3762: or
3763:
3764: my $status = $resource->status($_);
3765:
3766: ... use it here ...
3767: }
3768:
3769: Which you use depends on exactly what you are looking for. The
3770: status() function has been optimized for the nav maps display and may
3771: not precisely match what you need elsewhere.
3772:
3773: The symbolic constants shown below can be accessed through the
3774: resource object: C<$res->OPEN>.
3775:
3776: =over 4
3777:
3778: =item * B<getDateStatus>($part):
3779:
3780: ($part defaults to 0). A convenience function that returns a symbolic
3781: constant telling you about the date status of the part. The possible
3782: return values are:
3783:
3784: =back
3785:
3786: B<Date Codes>
3787:
3788: =over 4
3789:
3790: =item * B<OPEN_LATER>:
3791:
3792: The problem will be opened later.
3793:
3794: =item * B<OPEN>:
3795:
3796: Open and not yet due.
3797:
3798:
3799: =item * B<PAST_DUE_ANSWER_LATER>:
3800:
3801: The due date has passed, but the answer date has not yet arrived.
3802:
3803: =item * B<PAST_DUE_NO_ANSWER>:
3804:
3805: The due date has passed and there is no answer opening date set.
3806:
3807: =item * B<ANSWER_OPEN>:
3808:
3809: The answer date is here.
3810:
3811: =item * B<NETWORK_FAILURE>:
3812:
3813: The information is unknown due to network failure.
3814:
3815: =back
3816:
3817: =cut
3818:
3819: # Apparently the compiler optimizes these into constants automatically
3820: sub OPEN_LATER { return 0; }
3821: sub OPEN { return 1; }
3822: sub PAST_DUE_NO_ANSWER { return 2; }
3823: sub PAST_DUE_ANSWER_LATER { return 3; }
3824: sub ANSWER_OPEN { return 4; }
3825: sub NOTHING_SET { return 5; }
3826: sub NETWORK_FAILURE { return 100; }
3827:
3828: # getDateStatus gets the date status for a given problem part.
3829: # Because answer date, due date, and open date are fully independent
3830: # (i.e., it is perfectly possible to *only* have an answer date),
3831: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3832: # (past, future, none given). This function handles this with a decision
3833: # tree. Read the comments to follow the decision tree.
3834:
3835: sub getDateStatus {
3836: my $self = shift;
3837: my $part = shift;
3838: $part = "0" if (!defined($part));
3839:
3840: # Always return network failure if there was one.
3841: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3842:
3843: my $now = time();
3844:
3845: my $open = $self->opendate($part);
3846: my $due = $self->duedate($part);
3847: my $answer = $self->answerdate($part);
3848:
3849: if (!$open && !$due && !$answer) {
3850: # no data on the problem at all
3851: # should this be the same as "open later"? think multipart.
3852: return $self->NOTHING_SET;
3853: }
3854: if (!$open || $now < $open) {return $self->OPEN_LATER}
3855: if (!$due || $now < $due) {return $self->OPEN}
3856: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3857: if ($answer) { return $self->ANSWER_OPEN; }
3858: return PAST_DUE_NO_ANSWER;
3859: }
3860:
3861: =pod
3862:
3863: B<>
3864:
3865: =over 4
3866:
3867: =item * B<getCompletionStatus>($part):
3868:
3869: ($part defaults to 0.) A convenience function that returns a symbolic
3870: constant telling you about the completion status of the part, with the
3871: following possible results:
3872:
3873: =back
3874:
3875: B<Completion Codes>
3876:
3877: =over 4
3878:
3879: =item * B<NOT_ATTEMPTED>:
3880:
3881: Has not been attempted at all.
3882:
3883: =item * B<INCORRECT>:
3884:
3885: Attempted, but wrong by student.
3886:
3887: =item * B<INCORRECT_BY_OVERRIDE>:
3888:
3889: Attempted, but wrong by instructor override.
3890:
3891: =item * B<CORRECT>:
3892:
3893: Correct or correct by instructor.
3894:
3895: =item * B<CORRECT_BY_OVERRIDE>:
3896:
3897: Correct by instructor override.
3898:
3899: =item * B<EXCUSED>:
3900:
3901: Excused. Not yet implemented.
3902:
3903: =item * B<NETWORK_FAILURE>:
3904:
3905: Information not available due to network failure.
3906:
3907: =item * B<ATTEMPTED>:
3908:
3909: Attempted, and not yet graded.
3910:
3911: =back
3912:
3913: =cut
3914:
3915: sub NOT_ATTEMPTED { return 10; }
3916: sub INCORRECT { return 11; }
3917: sub INCORRECT_BY_OVERRIDE { return 12; }
3918: sub CORRECT { return 13; }
3919: sub CORRECT_BY_OVERRIDE { return 14; }
3920: sub EXCUSED { return 15; }
3921: sub ATTEMPTED { return 16; }
3922:
3923: sub getCompletionStatus {
3924: my $self = shift;
3925: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3926:
3927: my $status = $self->queryRestoreHash('solved', shift);
3928:
3929: # Left as separate if statements in case we ever do more with this
3930: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3931: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3932: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3933: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3934: if ($status eq 'excused') {return $self->EXCUSED; }
3935: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3936: return $self->NOT_ATTEMPTED;
3937: }
3938:
3939: sub queryRestoreHash {
3940: my $self = shift;
3941: my $hashentry = shift;
3942: my $part = shift;
3943: $part = "0" if (!defined($part) || $part eq '');
3944: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3945:
3946: $self->getReturnHash();
3947:
3948: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3949: }
3950:
3951: =pod
3952:
3953: B<Composite Status>
3954:
3955: Along with directly returning the date or completion status, the
3956: resource object includes a convenience function B<status>() that will
3957: combine the two status tidbits into one composite status that can
3958: represent the status of the resource as a whole. This method represents
3959: the concept of the thing we want to display to the user on the nav maps
3960: screen, which is a combination of completion and open status. The precise logic is
3961: documented in the comments of the status method. The following results
3962: may be returned, all available as methods on the resource object
3963: ($res->NETWORK_FAILURE): In addition to the return values that match
3964: the date or completion status, this function can return "ANSWER_SUBMITTED"
3965: if that problemstatus parameter value is set to No, suppressing the
3966: incorrect/correct feedback.
3967:
3968: =over 4
3969:
3970: =item * B<NETWORK_FAILURE>:
3971:
3972: The network has failed and the information is not available.
3973:
3974: =item * B<NOTHING_SET>:
3975:
3976: No dates have been set for this problem (part) at all. (Because only
3977: certain parts of a multi-part problem may be assigned, this can not be
3978: collapsed into "open later", as we do not know a given part will EVER
3979: be opened. For single part, this is the same as "OPEN_LATER".)
3980:
3981: =item * B<CORRECT>:
3982:
3983: For any reason at all, the part is considered correct.
3984:
3985: =item * B<EXCUSED>:
3986:
3987: For any reason at all, the problem is excused.
3988:
3989: =item * B<PAST_DUE_NO_ANSWER>:
3990:
3991: The problem is past due, not considered correct, and no answer date is
3992: set.
3993:
3994: =item * B<PAST_DUE_ANSWER_LATER>:
3995:
3996: The problem is past due, not considered correct, and an answer date in
3997: the future is set.
3998:
3999: =item * B<ANSWER_OPEN>:
4000:
4001: The problem is past due, not correct, and the answer is now available.
4002:
4003: =item * B<OPEN_LATER>:
4004:
4005: The problem is not yet open.
4006:
4007: =item * B<TRIES_LEFT>:
4008:
4009: The problem is open, has been tried, is not correct, but there are
4010: tries left.
4011:
4012: =item * B<INCORRECT>:
4013:
4014: The problem is open, and all tries have been used without getting the
4015: correct answer.
4016:
4017: =item * B<OPEN>:
4018:
4019: The item is open and not yet tried.
4020:
4021: =item * B<ATTEMPTED>:
4022:
4023: The problem has been attempted.
4024:
4025: =item * B<ANSWER_SUBMITTED>:
4026:
4027: An answer has been submitted, but the student should not see it.
4028:
4029: =back
4030:
4031: =cut
4032:
4033: sub TRIES_LEFT { return 20; }
4034: sub ANSWER_SUBMITTED { return 21; }
4035:
4036: sub status {
4037: my $self = shift;
4038: my $part = shift;
4039: if (!defined($part)) { $part = "0"; }
4040: my $completionStatus = $self->getCompletionStatus($part);
4041: my $dateStatus = $self->getDateStatus($part);
4042:
4043: # What we have is a two-dimensional matrix with 4 entries on one
4044: # dimension and 5 entries on the other, which we want to colorize,
4045: # plus network failure and "no date data at all".
4046:
4047: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4048: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4049:
4050: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4051: # If there's an answer date and we're past it, don't
4052: # suppress the feedback; student should know
4053: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
4054: $suppressFeedback = 0;
4055: }
4056:
4057: # There are a few whole rows we can dispose of:
4058: if ($completionStatus == CORRECT ||
4059: $completionStatus == CORRECT_BY_OVERRIDE ) {
4060: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
4061: }
4062:
4063: if ($completionStatus == ATTEMPTED) {
4064: return ATTEMPTED;
4065: }
4066:
4067: # If it's EXCUSED, then return that no matter what
4068: if ($completionStatus == EXCUSED) {
4069: return EXCUSED;
4070: }
4071:
4072: if ($dateStatus == NOTHING_SET) {
4073: return NOTHING_SET;
4074: }
4075:
4076: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4077: # by 4 matrix (date statuses).
4078:
4079: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4080: $dateStatus == PAST_DUE_NO_ANSWER ) {
4081: return $dateStatus;
4082: }
4083:
4084: if ($dateStatus == ANSWER_OPEN) {
4085: return ANSWER_OPEN;
4086: }
4087:
4088: # Now: (incorrect, incorrect_override, not_attempted) x
4089: # (open_later), (open)
4090:
4091: if ($dateStatus == OPEN_LATER) {
4092: return OPEN_LATER;
4093: }
4094:
4095: # If it's WRONG...
4096: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4097: # and there are TRIES LEFT:
4098: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4099: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4100: }
4101: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4102: }
4103:
4104: # Otherwise, it's untried and open
4105: return OPEN;
4106: }
4107:
4108: sub CLOSED { return 23; }
4109: sub ERROR { return 24; }
4110:
4111: =pod
4112:
4113: B<Simple Status>
4114:
4115: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4116: "Simple status" corresponds to "which icon is shown on the
4117: Navmaps". There are six "simple" statuses:
4118:
4119: =over 4
4120:
4121: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4122:
4123: =item * B<OPEN>: The problem is open and unattempted.
4124:
4125: =item * B<CORRECT>: The problem is correct for any reason.
4126:
4127: =item * B<INCORRECT>: The problem is incorrect and can still be
4128: completed successfully.
4129:
4130: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4131: does not know if they are correct. (The ellipsis icon.)
4132:
4133: =item * B<ERROR>: There is an error retrieving information about this
4134: problem.
4135:
4136: =back
4137:
4138: =cut
4139:
4140: # This hash maps the composite status to this simple status, and
4141: # can be used directly, if you like
4142: my %compositeToSimple =
4143: (
4144: NETWORK_FAILURE() => ERROR,
4145: NOTHING_SET() => CLOSED,
4146: CORRECT() => CORRECT,
4147: EXCUSED() => CORRECT,
4148: PAST_DUE_NO_ANSWER() => INCORRECT,
4149: PAST_DUE_ANSWER_LATER() => INCORRECT,
4150: ANSWER_OPEN() => INCORRECT,
4151: OPEN_LATER() => CLOSED,
4152: TRIES_LEFT() => OPEN,
4153: INCORRECT() => INCORRECT,
4154: OPEN() => OPEN,
4155: ATTEMPTED() => ATTEMPTED,
4156: ANSWER_SUBMITTED() => ATTEMPTED
4157: );
4158:
4159: sub simpleStatus {
4160: my $self = shift;
4161: my $part = shift;
4162: my $status = $self->status($part);
4163: return $compositeToSimple{$status};
4164: }
4165:
4166: =pod
4167:
4168: B<simpleStatusCount> will return an array reference containing, in
4169: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4170: and ERROR parts the given problem has.
4171:
4172: =cut
4173:
4174: # This maps the status to the slot we want to increment
4175: my %statusToSlotMap =
4176: (
4177: OPEN() => 0,
4178: CLOSED() => 1,
4179: CORRECT() => 2,
4180: INCORRECT() => 3,
4181: ATTEMPTED() => 4,
4182: ERROR() => 5
4183: );
4184:
4185: sub statusToSlot { return $statusToSlotMap{shift()}; }
4186:
4187: sub simpleStatusCount {
4188: my $self = shift;
4189:
4190: my @counts = (0, 0, 0, 0, 0, 0, 0);
4191: foreach my $part (@{$self->parts()}) {
4192: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4193: }
4194:
4195: return \@counts;
4196: }
4197:
4198: =pod
4199:
4200: B<Completable>
4201:
4202: The completable method represents the concept of I<whether the student can
4203: currently do the problem>. If the student can do the problem, which means
4204: that it is open, there are tries left, and if the problem is manually graded
4205: or the grade is suppressed via problemstatus, the student has not tried it
4206: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4207: either the student has tried it and there is no feedback, or that for
4208: some reason it is no longer completable (not open yet, successfully completed,
4209: out of tries, etc.). As an example, this is used as the filter for the
4210: "Uncompleted Homework" option for the nav maps.
4211:
4212: If this does not quite meet your needs, do not fiddle with it (unless you are
4213: fixing it to better match the student's conception of "completable" because
4214: it's broken somehow)... make a new method.
4215:
4216: =cut
4217:
4218: sub completable {
4219: my $self = shift;
4220: if (!$self->is_problem()) { return 0; }
4221: my $partCount = $self->countParts();
4222:
4223: foreach my $part (@{$self->parts()}) {
4224: if ($part eq '0' && $partCount != 1) { next; }
4225: my $status = $self->status($part);
4226: # "If any of the parts are open, or have tries left (implies open),
4227: # and it is not "attempted" (manually graded problem), it is
4228: # not "complete"
4229: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4230: $status == ANSWER_SUBMITTED() ) {
4231: # did this part already, as well as we can
4232: next;
4233: }
4234: if ($status == OPEN() || $status == TRIES_LEFT()) {
4235: return 1;
4236: }
4237: }
4238:
4239: # If all the parts were complete, so was this problem.
4240: return 0;
4241: }
4242:
4243: =pod
4244:
4245: =head2 Resource/Nav Map Navigation
4246:
4247: =over 4
4248:
4249: =item * B<getNext>():
4250:
4251: Retreive an array of the possible next resources after this
4252: one. Always returns an array, even in the one- or zero-element case.
4253:
4254: =item * B<getPrevious>():
4255:
4256: Retreive an array of the possible previous resources from this
4257: one. Always returns an array, even in the one- or zero-element case.
4258:
4259: =cut
4260:
4261: sub getNext {
4262: my $self = shift;
4263: my @branches;
4264: my $to = $self->to();
4265: foreach my $branch ( split(/,/, $to) ) {
4266: my $choice = $self->{NAV_MAP}->getById($branch);
4267: my $next = $choice->goesto();
4268: $next = $self->{NAV_MAP}->getById($next);
4269:
4270: push @branches, $next;
4271: }
4272: return \@branches;
4273: }
4274:
4275: sub getPrevious {
4276: my $self = shift;
4277: my @branches;
4278: my $from = $self->from();
4279: foreach my $branch ( split /,/, $from) {
4280: my $choice = $self->{NAV_MAP}->getById($branch);
4281: my $prev = $choice->comesfrom();
4282: $prev = $self->{NAV_MAP}->getById($prev);
4283:
4284: push @branches, $prev;
4285: }
4286: return \@branches;
4287: }
4288:
4289: sub browsePriv {
4290: my $self = shift;
4291: if (defined($self->{BROWSE_PRIV})) {
4292: return $self->{BROWSE_PRIV};
4293: }
4294:
4295: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4296: }
4297:
4298: =pod
4299:
4300: =back
4301:
4302: =cut
4303:
4304: 1;
4305:
4306: __END__
4307:
4308:
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