Annotation of loncom/interface/lonnavmaps.pm, revision 1.255
1.2 www 1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
1.1 www 3: #
1.255 ! albertel 4: # $Id: lonnavmaps.pm,v 1.254 2004/03/17 16:28:23 matthew Exp $
1.20 albertel 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: #
1.245 www 28: ###
1.2 www 29:
1.1 www 30: package Apache::lonnavmaps;
31:
32: use strict;
1.2 www 33: use Apache::Constants qw(:common :http);
1.18 albertel 34: use Apache::loncommon();
1.150 www 35: use Apache::lonmenu();
1.229 www 36: use Apache::lonlocal;
1.73 bowersj2 37: use POSIX qw (floor strftime);
1.192 bowersj2 38: use Data::Dumper; # for debugging, not always used
1.2 www 39:
1.133 bowersj2 40: # symbolic constants
41: sub SYMB { return 1; }
42: sub URL { return 2; }
43: sub NOTHING { return 3; }
44:
45: # Some data
46:
1.140 bowersj2 47: my $resObj = "Apache::lonnavmaps::resource";
48:
1.135 bowersj2 49: # Keep these mappings in sync with lonquickgrades, which uses the colors
50: # instead of the icons.
51: my %statusIconMap =
1.224 bowersj2 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: );
1.135 bowersj2 60:
61: my %iconAltTags =
62: ( 'navmap.correct.gif' => 'Correct',
63: 'navmap.wrong.gif' => 'Incorrect',
64: 'navmap.open.gif' => 'Open' );
1.133 bowersj2 65:
1.136 bowersj2 66: # Defines a status->color mapping, null string means don't color
67: my %colormap =
1.140 bowersj2 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 => '',
1.207 bowersj2 78: $resObj->NOTHING_SET => '',
79: $resObj->ATTEMPTED => '',
80: $resObj->ANSWER_SUBMITTED => ''
81: );
1.136 bowersj2 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";
1.130 www 85:
1.1 www 86: sub handler {
1.99 bowersj2 87: my $r = shift;
1.118 bowersj2 88: real_handler($r);
89: }
90:
91: sub real_handler {
92: my $r = shift;
1.2 www 93:
1.51 bowersj2 94: # Handle header-only request
95: if ($r->header_only) {
96: if ($ENV{'browser.mathml'}) {
1.232 www 97: &Apache::loncommon::content_type($r,'text/xml');
1.51 bowersj2 98: } else {
1.232 www 99: &Apache::loncommon::content_type($r,'text/html');
1.51 bowersj2 100: }
101: $r->send_http_header;
102: return OK;
103: }
104:
105: # Send header, don't cache this page
106: if ($ENV{'browser.mathml'}) {
1.232 www 107: &Apache::loncommon::content_type($r,'text/xml');
1.51 bowersj2 108: } else {
1.232 www 109: &Apache::loncommon::content_type($r,'text/html');
1.51 bowersj2 110: }
111: &Apache::loncommon::no_cache($r);
112: $r->send_http_header;
113:
1.106 bowersj2 114: # Create the nav map
1.221 bowersj2 115: my $navmap = Apache::lonnavmaps::navmap->new();
1.51 bowersj2 116:
1.55 bowersj2 117: if (!defined($navmap)) {
118: my $requrl = $r->uri;
119: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
120: return HTTP_NOT_ACCEPTABLE;
121: }
1.64 bowersj2 122:
1.111 bowersj2 123: $r->print("<html><head>\n");
1.229 www 124: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
1.150 www 125: # ------------------------------------------------------------ Get query string
126: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
1.158 bowersj2 127:
1.150 www 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: }
1.111 bowersj2 135:
1.64 bowersj2 136: # Header
1.150 www 137: $r->print('</head>'.
138: &Apache::loncommon::bodytag('Navigate Course Contents','',
1.151 www 139: $addentries,'','',$ENV{'form.register'}));
1.64 bowersj2 140: $r->print('<script>window.focus();</script>');
1.101 bowersj2 141:
1.124 bowersj2 142: $r->rflush();
143:
1.55 bowersj2 144: # Check that it's defined
145: if (!($navmap->courseMapDefined())) {
146: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
147: '</body></html>');
148: return OK;
149: }
150:
1.178 bowersj2 151: # See if there's only one map in the top-level, if we don't
152: # already have a filter... if so, automatically display it
1.222 bowersj2 153: # (older code; should use retrieveResources)
1.179 bowersj2 154: if ($ENV{QUERY_STRING} !~ /filter/) {
1.178 bowersj2 155: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
1.222 bowersj2 156: my $curRes;
1.178 bowersj2 157: my $sequenceCount = 0;
158: my $sequenceId;
1.222 bowersj2 159: while ($curRes = $iterator->next()) {
1.178 bowersj2 160: if (ref($curRes) && $curRes->is_sequence()) {
161: $sequenceCount++;
162: $sequenceId = $curRes->map_pc();
1.179 bowersj2 163: }
1.178 bowersj2 164: }
165:
166: if ($sequenceCount == 1) {
167: # The automatic iterator creation in the render call
168: # will pick this up. We know the condition because
169: # the defined($ENV{'form.filter'}) also ensures this
170: # is a fresh call.
171: $ENV{'form.filter'} = "$sequenceId";
1.155 bowersj2 172: }
173: }
174:
1.191 bowersj2 175: my $jumpToFirstHomework = 0;
1.184 bowersj2 176: # Check to see if the student is jumping to next open, do-able problem
177: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
1.191 bowersj2 178: $jumpToFirstHomework = 1;
1.184 bowersj2 179: # Find the next homework problem that they can do.
180: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
1.222 bowersj2 181: my $curRes;
1.184 bowersj2 182: my $foundDoableProblem = 0;
183: my $problemRes;
184:
1.222 bowersj2 185: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
1.184 bowersj2 186: if (ref($curRes) && $curRes->is_problem()) {
187: my $status = $curRes->status();
1.191 bowersj2 188: if ($curRes->completable()) {
1.184 bowersj2 189: $problemRes = $curRes;
190: $foundDoableProblem = 1;
191:
192: # Pop open all previous maps
193: my $stack = $iterator->getStack();
194: pop @$stack; # last resource in the stack is the problem
195: # itself, which we don't need in the map stack
196: my @mapPcs = map {$_->map_pc()} @$stack;
197: $ENV{'form.filter'} = join(',', @mapPcs);
198:
199: # Mark as both "here" and "jump"
200: $ENV{'form.postsymb'} = $curRes->symb();
201: }
202: }
203: }
204:
205: # If we found no problems, print a note to that effect.
206: if (!$foundDoableProblem) {
207: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
208: }
209: } else {
210: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
1.229 www 211: &mt("Go To My First Homework Problem")."</a> ");
1.184 bowersj2 212: }
213:
1.191 bowersj2 214: my $suppressEmptySequences = 0;
215: my $filterFunc = undef;
1.201 bowersj2 216: my $resource_no_folder_link = 0;
217:
1.191 bowersj2 218: # Display only due homework.
219: my $showOnlyHomework = 0;
220: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
221: $showOnlyHomework = 1;
222: $suppressEmptySequences = 1;
223: $filterFunc = sub { my $res = shift;
1.201 bowersj2 224: return $res->completable() || $res->is_map();
1.191 bowersj2 225: };
1.229 www 226: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
1.191 bowersj2 227: $ENV{'form.filter'} = '';
228: $ENV{'form.condition'} = 1;
1.201 bowersj2 229: $resource_no_folder_link = 1;
1.191 bowersj2 230: } else {
231: $r->print("<a href='navmaps?showOnlyHomework'>" .
1.229 www 232: &mt("Show Only Uncompleted Homework")."</a> ");
1.191 bowersj2 233: }
234:
1.133 bowersj2 235: # renderer call
1.191 bowersj2 236: my $renderArgs = { 'cols' => [0,1,2,3],
237: 'url' => '/adm/navmaps',
238: 'navmap' => $navmap,
239: 'suppressNavmap' => 1,
240: 'suppressEmptySequences' => $suppressEmptySequences,
241: 'filterFunc' => $filterFunc,
1.201 bowersj2 242: 'resource_no_folder_link' => $resource_no_folder_link,
1.191 bowersj2 243: 'r' => $r};
244: my $render = render($renderArgs);
245: $navmap->untieHashes();
1.133 bowersj2 246:
1.191 bowersj2 247: # If no resources were printed, print a reassuring message so the
248: # user knows there was no error.
249: if ($renderArgs->{'counter'} == 0) {
250: if ($showOnlyHomework) {
1.229 www 251: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
1.191 bowersj2 252: } else { # both jumpToFirstHomework and normal use the same: course must be empty
253: $r->print("<p><font size='+1'>This course is empty.</font></p>");
254: }
255: }
1.51 bowersj2 256:
1.128 bowersj2 257: $r->print("</body></html>");
1.134 bowersj2 258: $r->rflush();
1.59 bowersj2 259:
1.51 bowersj2 260: return OK;
261: }
262:
263: # Convenience functions: Returns a string that adds or subtracts
264: # the second argument from the first hash, appropriate for the
265: # query string that determines which folders to recurse on
266: sub addToFilter {
267: my $hashIn = shift;
268: my $addition = shift;
269: my %hash = %$hashIn;
270: $hash{$addition} = 1;
271:
272: return join (",", keys(%hash));
273: }
274:
275: sub removeFromFilter {
276: my $hashIn = shift;
277: my $subtraction = shift;
278: my %hash = %$hashIn;
279:
280: delete $hash{$subtraction};
281: return join(",", keys(%hash));
282: }
283:
284: # Convenience function: Given a stack returned from getStack on the iterator,
285: # return the correct src() value.
286: # Later, this should add an anchor when we start putting anchors in pages.
287: sub getLinkForResource {
288: my $stack = shift;
289: my $res;
290:
291: # Check to see if there are any pages in the stack
292: foreach $res (@$stack) {
1.248 www 293: if (defined($res)) {
294: if ($res->is_page()) {
295: return $res->src();
296: }
297: # in case folder was skipped over as "only sequence"
298: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
299: if ($map=~/\.page$/) {
1.249 www 300: return &Apache::lonnet::clutter($map).'#'.
301: &Apache::lonnet::escape(&Apache::lonnet::declutter($src));
1.248 www 302: }
1.51 bowersj2 303: }
304: }
305:
306: # Failing that, return the src of the last resource that is defined
307: # (when we first recurse on a map, it puts an undefined resource
308: # on the bottom because $self->{HERE} isn't defined yet, and we
309: # want the src for the map anyhow)
310: foreach (@$stack) {
311: if (defined($_)) { $res = $_; }
312: }
313:
314: return $res->src();
315: }
316:
1.251 www 317: # Convenience function: This separates the logic of how to create
1.53 bowersj2 318: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
1.251 www 319: # etc.) into a separate function. It takes a resource object as the
1.53 bowersj2 320: # first parameter, and the part number of the resource as the second.
321: # It's basically a big switch statement on the status of the resource.
322:
323: sub getDescription {
324: my $res = shift;
325: my $part = shift;
1.69 bowersj2 326: my $status = $res->status($part);
1.53 bowersj2 327:
1.182 bowersj2 328: if ($status == $res->NETWORK_FAILURE) {
1.229 www 329: return &mt("Having technical difficulties; please check status later");
1.182 bowersj2 330: }
1.53 bowersj2 331: if ($status == $res->NOTHING_SET) {
1.229 www 332: return &mt("Not currently assigned.");
1.53 bowersj2 333: }
334: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 335: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 336: }
337: if ($status == $res->OPEN) {
1.79 bowersj2 338: if ($res->duedate($part)) {
1.229 www 339: return &mt("Due")." " .timeToHumanString($res->duedate($part));
1.66 bowersj2 340: } else {
1.229 www 341: return &mt("Open, no due date");
1.66 bowersj2 342: }
1.53 bowersj2 343: }
1.54 bowersj2 344: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.229 www 345: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 346: }
347: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.229 www 348: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
1.53 bowersj2 349: }
350: if ($status == $res->ANSWER_OPEN) {
1.229 www 351: return &mt("Answer available");
1.53 bowersj2 352: }
1.59 bowersj2 353: if ($status == $res->EXCUSED) {
1.229 www 354: return &mt("Excused by instructor");
1.59 bowersj2 355: }
1.69 bowersj2 356: if ($status == $res->ATTEMPTED) {
1.229 www 357: return &mt("Answer submitted, not yet graded");
1.69 bowersj2 358: }
1.59 bowersj2 359: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 360: my $tries = $res->tries($part);
361: my $maxtries = $res->maxtries($part);
362: my $triesString = "";
363: if ($tries && $maxtries) {
364: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
365: if ($maxtries > 1 && $maxtries - $tries == 1) {
366: $triesString = "<b>$triesString</b>";
367: }
368: }
1.244 albertel 369: if ($res->duedate($part)) {
1.229 www 370: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 371: " $triesString";
372: } else {
1.229 www 373: return &mt("No due date")." $triesString";
1.66 bowersj2 374: }
1.59 bowersj2 375: }
1.185 bowersj2 376: if ($status == $res->ANSWER_SUBMITTED) {
1.229 www 377: return &mt('Answer submitted');
1.185 bowersj2 378: }
1.53 bowersj2 379: }
380:
1.115 bowersj2 381: # Convenience function, so others can use it: Is the problem due in less then
382: # 24 hours, and still can be done?
383:
1.252 matthew 384: sub dueInLessThan24Hours {
1.115 bowersj2 385: my $res = shift;
386: my $part = shift;
387: my $status = $res->status($part);
388:
1.207 bowersj2 389: return ($status == $res->OPEN() ||
1.115 bowersj2 390: $status == $res->TRIES_LEFT()) &&
1.244 albertel 391: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
392: $res->duedate($part) > time();
1.115 bowersj2 393: }
394:
395: # Convenience function, so others can use it: Is there only one try remaining for the
396: # part, with more then one try to begin with, not due yet and still can be done?
397: sub lastTry {
398: my $res = shift;
399: my $part = shift;
400:
401: my $tries = $res->tries($part);
402: my $maxtries = $res->maxtries($part);
403: return $tries && $maxtries && $maxtries > 1 &&
1.244 albertel 404: $maxtries - $tries == 1 && $res->duedate($part) &&
405: $res->duedate($part) > time();
1.115 bowersj2 406: }
407:
1.101 bowersj2 408: # This puts a human-readable name on the ENV variable.
1.177 www 409:
1.68 bowersj2 410: sub advancedUser {
1.177 www 411: return $ENV{'request.role.adv'};
1.68 bowersj2 412: }
413:
1.73 bowersj2 414:
415: # timeToHumanString takes a time number and converts it to a
416: # human-readable representation, meant to be used in the following
417: # manner:
418: # print "Due $timestring"
419: # print "Open $timestring"
420: # print "Answer available $timestring"
421: # Very, very, very, VERY English-only... goodness help a localizer on
422: # this func...
1.53 bowersj2 423: sub timeToHumanString {
1.58 albertel 424: my ($time) = @_;
425: # zero, '0' and blank are bad times
1.73 bowersj2 426: if (!$time) {
1.229 www 427: return &mt('never');
1.73 bowersj2 428: }
1.231 www 429: unless (&Apache::lonlocal::current_language()=~/^en/) {
1.237 www 430: return &Apache::lonlocal::locallocaltime($time);
1.229 www 431: }
1.73 bowersj2 432: my $now = time();
433:
434: my @time = localtime($time);
435: my @now = localtime($now);
436:
437: # Positive = future
438: my $delta = $time - $now;
439:
440: my $minute = 60;
441: my $hour = 60 * $minute;
442: my $day = 24 * $hour;
443: my $week = 7 * $day;
444: my $inPast = 0;
445:
446: # Logic in comments:
447: # Is it now? (extremely unlikely)
448: if ( $delta == 0 ) {
449: return "this instant";
450: }
451:
452: if ($delta < 0) {
453: $inPast = 1;
454: $delta = -$delta;
455: }
456:
457: if ( $delta > 0 ) {
1.101 bowersj2 458:
1.73 bowersj2 459: my $tense = $inPast ? " ago" : "";
460: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 461:
462: # Less then a minute
1.73 bowersj2 463: if ( $delta < $minute ) {
464: if ($delta == 1) { return "${prefix}1 second$tense"; }
465: return "$prefix$delta seconds$tense";
466: }
467:
1.101 bowersj2 468: # Less then an hour
1.73 bowersj2 469: if ( $delta < $hour ) {
470: # If so, use minutes
471: my $minutes = floor($delta / 60);
472: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
473: return "$prefix$minutes minutes$tense";
474: }
475:
476: # Is it less then 24 hours away? If so,
477: # display hours + minutes
478: if ( $delta < $hour * 24) {
479: my $hours = floor($delta / $hour);
480: my $minutes = floor(($delta % $hour) / $minute);
481: my $hourString = "$hours hours";
482: my $minuteString = ", $minutes minutes";
483: if ($hours == 1) {
484: $hourString = "1 hour";
485: }
486: if ($minutes == 1) {
487: $minuteString = ", 1 minute";
488: }
489: if ($minutes == 0) {
490: $minuteString = "";
491: }
492: return "$prefix$hourString$minuteString$tense";
493: }
494:
495: # Less then 5 days away, display day of the week and
496: # HH:MM
497: if ( $delta < $day * 5 ) {
1.85 bowersj2 498: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.238 albertel 499: $timeStr =~ s/12:00 am/00:00/;
1.73 bowersj2 500: $timeStr =~ s/12:00 pm/noon/;
501: return ($inPast ? "last " : "next ") .
502: $timeStr;
503: }
504:
505: # Is it this year?
506: if ( $time[5] == $now[5]) {
507: # Return on Month Day, HH:MM meridian
508: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
1.238 albertel 509: $timeStr =~ s/12:00 am/00:00/;
1.73 bowersj2 510: $timeStr =~ s/12:00 pm/noon/;
511: return $timeStr;
512: }
513:
514: # Not this year, so show the year
515: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
1.238 albertel 516: $timeStr =~ s/12:00 am/00:00/;
1.73 bowersj2 517: $timeStr =~ s/12:00 pm/noon/;
518: return $timeStr;
1.58 albertel 519: }
1.53 bowersj2 520: }
521:
1.51 bowersj2 522:
1.133 bowersj2 523: =pod
524:
1.174 albertel 525: =head1 NAME
526:
1.217 bowersj2 527: Apache::lonnavmap - Subroutines to handle and render the navigation
528: maps
1.174 albertel 529:
530: =head1 SYNOPSIS
531:
532: The main handler generates the navigational listing for the course,
533: the other objects export this information in a usable fashion for
1.205 bowersj2 534: other modules.
1.133 bowersj2 535:
1.216 bowersj2 536: =head1 OVERVIEW
537:
1.217 bowersj2 538: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
1.218 bowersj2 539: course structure and caches it in what is often referred to as the
540: "big hash" X<big hash>. You can see it if you are logged into
541: LON-CAPA, in a course, by going to /adm/test. (You may need to
542: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
543: content of the hash will be under the heading "Big Hash".
1.216 bowersj2 544:
545: Big Hash contains, among other things, how resources are related
546: to each other (next/previous), what resources are maps, which
547: resources are being chosen to not show to the student (for random
548: selection), and a lot of other things that can take a lot of time
549: to compute due to the amount of data that needs to be collected and
550: processed.
551:
552: Apache::lonnavmaps provides an object model for manipulating this
553: information in a higher-level fashion then directly manipulating
554: the hash. It also provides access to several auxilary functions
555: that aren't necessarily stored in the Big Hash, but are a per-
556: resource sort of value, like whether there is any feedback on
557: a given resource.
558:
559: Apache::lonnavmaps also abstracts away branching, and someday,
560: conditions, for the times where you don't really care about those
561: things.
562:
563: Apache::lonnavmaps also provides fairly powerful routines for
564: rendering navmaps, and last but not least, provides the navmaps
565: view for when the user clicks the NAV button.
566:
567: B<Note>: Apache::lonnavmaps I<only> works for the "currently
568: logged in user"; if you want things like "due dates for another
569: student" lonnavmaps can not directly retrieve information like
570: that. You need the EXT function. This module can still help,
571: because many things, such as the course structure, are constant
572: between users, and Apache::lonnavmaps can help by providing
573: symbs for the EXT call.
574:
575: The rest of this file will cover the provided rendering routines,
576: which can often be used without fiddling with the navmap object at
577: all, then documents the Apache::lonnavmaps::navmap object, which
578: is the key to accessing the Big Hash information, covers the use
579: of the Iterator (which provides the logic for traversing the
580: somewhat-complicated Big Hash data structure), documents the
581: Apache::lonnavmaps::Resource objects that are returned by
582:
1.205 bowersj2 583: =head1 Subroutine: render
1.133 bowersj2 584:
1.174 albertel 585: The navmap renderer package provides a sophisticated rendering of the
586: standard navigation maps interface into HTML. The provided nav map
587: handler is actually just a glorified call to this.
1.133 bowersj2 588:
1.216 bowersj2 589: Because of the large number of parameters this function accepts,
1.174 albertel 590: instead of passing it arguments as is normal, pass it in an anonymous
1.216 bowersj2 591: hash with the desired options.
1.174 albertel 592:
593: The package provides a function called 'render', called as
1.205 bowersj2 594: Apache::lonnavmaps::render({}).
1.51 bowersj2 595:
1.133 bowersj2 596: =head2 Overview of Columns
1.51 bowersj2 597:
1.174 albertel 598: The renderer will build an HTML table for the navmap and return
599: it. The table is consists of several columns, and a row for each
600: resource (or possibly each part). You tell the renderer how many
601: columns to create and what to place in each column, optionally using
1.205 bowersj2 602: one or more of the prepared columns, and the renderer will assemble
1.174 albertel 603: the table.
604:
605: Any additional generally useful column types should be placed in the
606: renderer code here, so anybody can use it anywhere else. Any code
607: specific to the current application (such as the addition of <input>
608: elements in a column) should be placed in the code of the thing using
609: the renderer.
610:
611: At the core of the renderer is the array reference COLS (see Example
612: section below for how to pass this correctly). The COLS array will
613: consist of entries of one of two types of things: Either an integer
614: representing one of the pre-packaged column types, or a sub reference
615: that takes a resource reference, a part number, and a reference to the
616: argument hash passed to the renderer, and returns a string that will
617: be inserted into the HTML representation as it.
618:
1.216 bowersj2 619: All other parameters are ways of either changing how the columns
620: are printing, or which rows are shown.
621:
1.174 albertel 622: The pre-packaged column names are refered to by constants in the
1.205 bowersj2 623: Apache::lonnavmaps namespace. The following currently exist:
1.51 bowersj2 624:
1.174 albertel 625: =over 4
1.51 bowersj2 626:
1.216 bowersj2 627: =item * B<Apache::lonnavmaps::resource>:
1.51 bowersj2 628:
1.174 albertel 629: The general info about the resource: Link, icon for the type, etc. The
1.216 bowersj2 630: first column in the standard nav map display. This column provides the
631: indentation effect seen in the B<NAV> screen. This column also accepts
1.205 bowersj2 632: the following parameters in the renderer hash:
1.51 bowersj2 633:
1.133 bowersj2 634: =over 4
1.51 bowersj2 635:
1.216 bowersj2 636: =item * B<resource_nolink>: default false
1.51 bowersj2 637:
1.216 bowersj2 638: If true, the resource will not be linked. By default, all non-folder
639: resources are linked.
1.174 albertel 640:
1.216 bowersj2 641: =item * B<resource_part_count>: default true
1.51 bowersj2 642:
1.216 bowersj2 643: If true, the resource will show a part count B<if> the full
644: part list is not displayed. (See "condense_parts" later.) If false,
645: the resource will never show a part count.
1.133 bowersj2 646:
1.174 albertel 647: =item * B<resource_no_folder_link>:
1.133 bowersj2 648:
1.174 albertel 649: If true, the resource's folder will not be clickable to open or close
650: it. Default is false. True implies printCloseAll is false, since you
651: can't close or open folders when this is on anyhow.
1.144 bowersj2 652:
1.133 bowersj2 653: =back
1.51 bowersj2 654:
1.225 bowersj2 655: =item * B<Apache::lonnavmaps::communication_status>:
1.174 albertel 656:
657: Whether there is discussion on the resource, email for the user, or
658: (lumped in here) perl errors in the execution of the problem. This is
659: the second column in the main nav map.
660:
1.225 bowersj2 661: =item * B<Apache::lonnavmaps::quick_status>:
1.51 bowersj2 662:
1.216 bowersj2 663: An icon for the status of a problem, with five possible states:
664: Correct, incorrect, open, awaiting grading (for a problem where the
665: computer's grade is suppressed, or the computer can't grade, like
666: essay problem), or none (not open yet, not a problem). The
1.174 albertel 667: third column of the standard navmap.
1.51 bowersj2 668:
1.225 bowersj2 669: =item * B<Apache::lonnavmaps::long_status>:
1.174 albertel 670:
671: A text readout of the details of the current status of the problem,
672: such as "Due in 22 hours". The fourth column of the standard navmap.
1.51 bowersj2 673:
1.225 bowersj2 674: =item * B<Apache::lonnavmaps::part_status_summary>:
675:
676: A text readout summarizing the status of the problem. If it is a
677: single part problem, will display "Correct", "Incorrect",
678: "Not yet open", "Open", "Attempted", or "Error". If there are
679: multiple parts, this will output a string that in HTML will show a
680: status of how many parts are in each status, in color coding, trying
681: to match the colors of the icons within reason.
682:
683: Note this only makes sense if you are I<not> showing parts. If
684: C<showParts> is true (see below), this column will not output
685: anything.
686:
1.133 bowersj2 687: =back
1.51 bowersj2 688:
1.133 bowersj2 689: If you add any others please be sure to document them here.
1.51 bowersj2 690:
1.174 albertel 691: An example of a column renderer that will show the ID number of a
692: resource, along with the part name if any:
1.51 bowersj2 693:
1.133 bowersj2 694: sub {
695: my ($resource, $part, $params) = @_;
696: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
697: return '<td>' . $resource->{ID} . '</td>';
698: }
1.51 bowersj2 699:
1.174 albertel 700: Note these functions are responsible for the TD tags, which allow them
701: to override vertical and horizontal alignment, etc.
1.130 www 702:
1.133 bowersj2 703: =head2 Parameters
1.115 bowersj2 704:
1.217 bowersj2 705: Minimally, you should be
1.174 albertel 706: able to get away with just using 'cols' (to specify the columns
707: shown), 'url' (necessary for the folders to link to the current screen
708: correctly), and possibly 'queryString' if your app calls for it. In
709: that case, maintaining the state of the folders will be done
710: automatically.
1.140 bowersj2 711:
1.133 bowersj2 712: =over 4
1.51 bowersj2 713:
1.216 bowersj2 714: =item * B<iterator>: default: constructs one from %ENV
1.174 albertel 715:
716: A reference to a fresh ::iterator to use from the navmaps. The
717: rendering will reflect the options passed to the iterator, so you can
718: use that to just render a certain part of the course, if you like. If
719: one is not passed, the renderer will attempt to construct one from
720: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
721: 'iterator_map' parameter if any.
722:
1.216 bowersj2 723: =item * B<iterator_map>: default: not used
1.174 albertel 724:
725: If you are letting the renderer do the iterator handling, you can
726: instruct the renderer to render only a particular map by passing it
727: the source of the map you want to process, like
728: '/res/103/jerf/navmap.course.sequence'.
729:
1.216 bowersj2 730: =item * B<navmap>: default: constructs one from %ENV
1.174 albertel 731:
732: A reference to a navmap, used only if an iterator is not passed in. If
733: this is necessary to make an iterator but it is not passed in, a new
734: one will be constructed based on ENV info. This is useful to do basic
735: error checking before passing it off to render.
736:
1.216 bowersj2 737: =item * B<r>: default: must be passed in
1.174 albertel 738:
739: The standard Apache response object. This must be passed to the
740: renderer or the course hash will be locked.
741:
1.216 bowersj2 742: =item * B<cols>: default: empty (useless)
1.174 albertel 743:
744: An array reference
745:
1.216 bowersj2 746: =item * B<showParts>:default true
1.174 albertel 747:
1.216 bowersj2 748: A flag. If true, a line for the resource itself, and a line
1.174 albertel 749: for each part will be displayed. If not, only one line for each
750: resource will be displayed.
751:
1.216 bowersj2 752: =item * B<condenseParts>: default true
1.174 albertel 753:
1.216 bowersj2 754: A flag. If true, if all parts of the problem have the same
1.174 albertel 755: status and that status is Nothing Set, Correct, or Network Failure,
756: then only one line will be displayed for that resource anyhow. If no,
757: all parts will always be displayed. If showParts is 0, this is
758: ignored.
759:
1.216 bowersj2 760: =item * B<jumpCount>: default: determined from %ENV
1.174 albertel 761:
1.216 bowersj2 762: A string identifying the URL to place the anchor 'curloc' at.
763: It is the responsibility of the renderer user to
1.174 albertel 764: ensure that the #curloc is in the URL. By default, determined through
765: the use of the ENV{} 'jump' information, and should normally "just
766: work" correctly.
1.144 bowersj2 767:
1.216 bowersj2 768: =item * B<here>: default: empty string
1.140 bowersj2 769:
1.216 bowersj2 770: A Symb identifying where to place the 'here' marker. The empty
771: string means no marker.
1.92 bowersj2 772:
1.216 bowersj2 773: =item * B<indentString>: default: 25 pixel whitespace image
1.164 bowersj2 774:
1.216 bowersj2 775: A string identifying the indentation string to use.
1.92 bowersj2 776:
1.216 bowersj2 777: =item * B<queryString>: default: empty
1.51 bowersj2 778:
1.174 albertel 779: A string which will be prepended to the query string used when the
1.216 bowersj2 780: folders are opened or closed. You can use this to pass
781: application-specific values.
1.55 bowersj2 782:
1.216 bowersj2 783: =item * B<url>: default: none
1.84 bowersj2 784:
1.174 albertel 785: The url the folders will link to, which should be the current
1.216 bowersj2 786: page. Required if the resource info column is shown, and you
787: are allowing the user to open and close folders.
1.115 bowersj2 788:
1.216 bowersj2 789: =item * B<currentJumpIndex>: default: no jumping
1.55 bowersj2 790:
1.174 albertel 791: Describes the currently-open row number to cause the browser to jump
792: to, because the user just opened that folder. By default, pulled from
793: the Jump information in the ENV{'form.*'}.
1.51 bowersj2 794:
1.216 bowersj2 795: =item * B<printKey>: default: false
1.51 bowersj2 796:
1.174 albertel 797: If true, print the key that appears on the top of the standard
1.216 bowersj2 798: navmaps.
1.139 bowersj2 799:
1.216 bowersj2 800: =item * B<printCloseAll>: default: true
1.140 bowersj2 801:
1.174 albertel 802: If true, print the "Close all folders" or "open all folders"
1.216 bowersj2 803: links.
1.140 bowersj2 804:
1.216 bowersj2 805: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1.153 bowersj2 806:
1.174 albertel 807: A function that takes the resource object as its only parameter and
808: returns a true or false value. If true, the resource is displayed. If
1.216 bowersj2 809: false, it is simply skipped in the display.
1.174 albertel 810:
1.216 bowersj2 811: =item * B<suppressEmptySequences>: default: false
1.190 bowersj2 812:
813: If you're using a filter function, and displaying sequences to orient
814: the user, then frequently some sequences will be empty. Setting this to
815: true will cause those sequences not to display, so as not to confuse the
816: user into thinking that if the sequence is there there should be things
1.216 bowersj2 817: under it; for example, see the "Show Uncompleted Homework" view on the
818: B<NAV> screen.
1.190 bowersj2 819:
1.216 bowersj2 820: =item * B<suppressNavmaps>: default: false
1.174 albertel 821:
1.216 bowersj2 822: If true, will not display Navigate Content resources.
1.143 bowersj2 823:
1.133 bowersj2 824: =back
1.51 bowersj2 825:
1.133 bowersj2 826: =head2 Additional Info
1.51 bowersj2 827:
1.174 albertel 828: In addition to the parameters you can pass to the renderer, which will
829: be passed through unchange to the column renderers, the renderer will
830: generate the following information which your renderer may find
831: useful:
832:
1.216 bowersj2 833: =over 4
834:
835: =item * B<counter>:
1.145 bowersj2 836:
1.216 bowersj2 837: Contains the number of rows printed. Useful after calling the render
838: function, as you can detect whether anything was printed at all.
839:
840: =item * B<isNewBranch>:
841:
842: Useful for renderers: If this resource is currently the first resource
843: of a new branch, this will be true. The Resource column (leftmost in the
844: navmaps screen) uses this to display the "new branch" icon
1.59 bowersj2 845:
1.133 bowersj2 846: =back
1.59 bowersj2 847:
1.133 bowersj2 848: =cut
1.59 bowersj2 849:
1.133 bowersj2 850: sub resource { return 0; }
851: sub communication_status { return 1; }
852: sub quick_status { return 2; }
853: sub long_status { return 3; }
1.225 bowersj2 854: sub part_status_summary { return 4; }
1.51 bowersj2 855:
1.133 bowersj2 856: sub render_resource {
857: my ($resource, $part, $params) = @_;
1.51 bowersj2 858:
1.133 bowersj2 859: my $nonLinkedText = ''; # stuff after resource title not in link
1.51 bowersj2 860:
1.134 bowersj2 861: my $link = $params->{"resourceLink"};
862: my $src = $resource->src();
863: my $it = $params->{"iterator"};
1.133 bowersj2 864: my $filter = $it->{FILTER};
865:
866: my $title = $resource->compTitle();
867: if ($src =~ /^\/uploaded\//) {
868: $nonLinkedText=$title;
869: $title = '';
870: }
871: my $partLabel = "";
872: my $newBranchText = "";
873:
874: # If this is a new branch, label it so
875: if ($params->{'isNewBranch'}) {
876: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
1.51 bowersj2 877: }
878:
1.133 bowersj2 879: # links to open and close the folder
880: my $linkopen = "<a href='$link'>";
881: my $linkclose = "</a>";
1.51 bowersj2 882:
1.204 albertel 883: # Default icon: unknown page
884: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
1.133 bowersj2 885:
886: if ($resource->is_problem()) {
1.192 bowersj2 887: if ($part eq '0' || $params->{'condensed'}) {
1.133 bowersj2 888: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
889: } else {
890: $icon = $params->{'indentString'};
891: }
1.204 albertel 892: } else {
1.243 albertel 893: $icon = "<img src='".&Apache::loncommon::icon($resource->src).
894: "' alt='' border='0' />";
1.133 bowersj2 895: }
1.51 bowersj2 896:
1.133 bowersj2 897: # Display the correct map icon to open or shut map
898: if ($resource->is_map()) {
899: my $mapId = $resource->map_pc();
900: my $nowOpen = !defined($filter->{$mapId});
901: if ($it->{CONDITION}) {
902: $nowOpen = !$nowOpen;
903: }
1.144 bowersj2 904:
1.205 bowersj2 905: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
906:
1.144 bowersj2 907: if (!$params->{'resource_no_folder_link'}) {
1.205 bowersj2 908: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1.144 bowersj2 909: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
910:
911: $linkopen = "<a href='" . $params->{'url'} . '?' .
912: $params->{'queryString'} . '&filter=';
913: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
914: addToFilter($filter, $mapId) :
915: removeFromFilter($filter, $mapId);
916: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
917: . $params->{'hereType'} . '&here=' .
918: &Apache::lonnet::escape($params->{'here'}) .
1.159 bowersj2 919: '&jump=' .
1.144 bowersj2 920: &Apache::lonnet::escape($resource->symb()) .
921: "&folderManip=1'>";
922: } else {
923: # Don't allow users to manipulate folder
1.205 bowersj2 924: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1.144 bowersj2 925: '.nomanip.gif';
926: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
927:
928: $linkopen = "";
929: $linkclose = "";
930: }
1.133 bowersj2 931: }
1.51 bowersj2 932:
1.133 bowersj2 933: if ($resource->randomout()) {
934: $nonLinkedText .= ' <i>(hidden)</i> ';
935: }
936:
937: # We're done preparing and finally ready to start the rendering
938: my $result = "<td align='left' valign='center'>";
1.140 bowersj2 939:
940: my $indentLevel = $params->{'indentLevel'};
941: if ($newBranchText) { $indentLevel--; }
942:
1.133 bowersj2 943: # print indentation
1.140 bowersj2 944: for (my $i = 0; $i < $indentLevel; $i++) {
1.133 bowersj2 945: $result .= $params->{'indentString'};
1.84 bowersj2 946: }
947:
1.133 bowersj2 948: # Decide what to display
949: $result .= "$newBranchText$linkopen$icon$linkclose";
950:
951: my $curMarkerBegin = '';
952: my $curMarkerEnd = '';
1.51 bowersj2 953:
1.133 bowersj2 954: # Is this the current resource?
1.158 bowersj2 955: if (!$params->{'displayedHereMarker'} &&
956: $resource->symb() eq $params->{'here'} ) {
1.133 bowersj2 957: $curMarkerBegin = '<font color="red" size="+2">> </font>';
958: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1.158 bowersj2 959: $params->{'displayedHereMarker'} = 1;
1.51 bowersj2 960: }
961:
1.192 bowersj2 962: if ($resource->is_problem() && $part ne '0' &&
1.133 bowersj2 963: !$params->{'condensed'}) {
1.245 www 964: my $displaypart=&Apache::lonnet::EXT('resource.'.$part.'.display',
965: $resource->symb());
966: unless ($displaypart) { $displaypart=$part; }
967: $partLabel = " (Part: $displaypart)";
968: $link.='#'.&Apache::lonnet::escape($part);
1.133 bowersj2 969: $title = "";
1.51 bowersj2 970: }
971:
1.163 bowersj2 972: if ($params->{'condensed'} && $resource->countParts() > 1) {
1.133 bowersj2 973: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51 bowersj2 974: }
975:
1.203 bowersj2 976: if (!$params->{'resource_nolink'} && $src !~ /^\/uploaded\// &&
1.205 bowersj2 977: !$resource->is_sequence()) {
1.144 bowersj2 978: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
979: } else {
980: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
981: }
1.51 bowersj2 982:
1.133 bowersj2 983: return $result;
984: }
1.51 bowersj2 985:
1.133 bowersj2 986: sub render_communication_status {
987: my ($resource, $part, $params) = @_;
1.134 bowersj2 988: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
989:
990: my $link = $params->{"resourceLink"};
991: my $linkopen = "<a href='$link'>";
992: my $linkclose = "</a>";
993:
994: if ($resource->hasDiscussion()) {
995: $discussionHTML = $linkopen .
996: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
997: $linkclose;
998: }
999:
1000: if ($resource->getFeedback()) {
1001: my $feedback = $resource->getFeedback();
1002: foreach (split(/\,/, $feedback)) {
1003: if ($_) {
1004: $feedbackHTML .= ' <a href="/adm/email?display='
1005: . &Apache::lonnet::escape($_) . '">'
1006: . '<img src="/adm/lonMisc/feedback.gif" '
1007: . 'border="0" /></a>';
1008: }
1009: }
1010: }
1011:
1012: if ($resource->getErrors()) {
1013: my $errors = $resource->getErrors();
1.254 matthew 1014: my $errorcount = 0;
1.134 bowersj2 1015: foreach (split(/,/, $errors)) {
1.254 matthew 1016: last if ($errorcount>=10); # Only output 10 bombs maximum
1.134 bowersj2 1017: if ($_) {
1.254 matthew 1018: $errorcount++;
1.134 bowersj2 1019: $errorHTML .= ' <a href="/adm/email?display='
1020: . &Apache::lonnet::escape($_) . '">'
1021: . '<img src="/adm/lonMisc/bomb.gif" '
1022: . 'border="0" /></a>';
1023: }
1024: }
1.197 bowersj2 1025: }
1026:
1027: if ($params->{'multipart'} && $part != '0') {
1028: $discussionHTML = $feedbackHTML = $errorHTML = '';
1.134 bowersj2 1029: }
1030:
1031: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1032:
1.133 bowersj2 1033: }
1034: sub render_quick_status {
1035: my ($resource, $part, $params) = @_;
1.135 bowersj2 1036: my $result = "";
1037: my $firstDisplayed = !$params->{'condensed'} &&
1038: $params->{'multipart'} && $part eq "0";
1039:
1040: my $link = $params->{"resourceLink"};
1041: my $linkopen = "<a href='$link'>";
1042: my $linkclose = "</a>";
1043:
1044: if ($resource->is_problem() &&
1045: !$firstDisplayed) {
1.224 bowersj2 1046:
1047: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1.135 bowersj2 1048: my $alt = $iconAltTags{$icon};
1049: if ($icon) {
1050: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1051: } else {
1052: $result .= "<td width='30'> </td>\n";
1053: }
1054: } else { # not problem, no icon
1055: $result .= "<td width='30'> </td>\n";
1056: }
1057:
1058: return $result;
1.133 bowersj2 1059: }
1060: sub render_long_status {
1061: my ($resource, $part, $params) = @_;
1.136 bowersj2 1062: my $result = "<td align='right' valign='center'>\n";
1063: my $firstDisplayed = !$params->{'condensed'} &&
1064: $params->{'multipart'} && $part eq "0";
1065:
1066: my $color;
1.212 bowersj2 1067: if ($resource->is_problem()) {
1.136 bowersj2 1068: $color = $colormap{$resource->status};
1069:
1.252 matthew 1070: if (dueInLessThan24Hours($resource, $part) ||
1.136 bowersj2 1071: lastTry($resource, $part)) {
1072: $color = $hurryUpColor;
1073: }
1074: }
1075:
1076: if ($resource->kind() eq "res" &&
1077: $resource->is_problem() &&
1078: !$firstDisplayed) {
1079: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1080: $result .= getDescription($resource, $part);
1081: if ($color) {$result .= "</b></font>"; }
1082: }
1083: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1084: $result .= '(randomly select ' . $resource->randompick() .')';
1085: }
1.210 bowersj2 1086:
1.213 bowersj2 1087: # Debugging code
1088: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1089: # ' - Part: ' . $part;
1090:
1.210 bowersj2 1091: $result .= "</td>\n";
1.136 bowersj2 1092:
1093: return $result;
1.51 bowersj2 1094: }
1095:
1.227 bowersj2 1096: # Colors obtained by taking the icons, matching the colors, and
1097: # possibly reducing the Value (HSV) of the color, if it's too bright
1098: # for text, generally by one third or so.
1.225 bowersj2 1099: my %statusColors =
1100: (
1101: $resObj->CLOSED => '#000000',
1.227 bowersj2 1102: $resObj->OPEN => '#998b13',
1103: $resObj->CORRECT => '#26933f',
1104: $resObj->INCORRECT => '#c48207',
1105: $resObj->ATTEMPTED => '#a87510',
1.225 bowersj2 1106: $resObj->ERROR => '#000000'
1107: );
1108: my %statusStrings =
1109: (
1110: $resObj->CLOSED => 'Not yet open',
1111: $resObj->OPEN => 'Open',
1112: $resObj->CORRECT => 'Correct',
1113: $resObj->INCORRECT => 'Incorrect',
1114: $resObj->ATTEMPTED => 'Attempted',
1115: $resObj->ERROR => 'Network Error'
1116: );
1117: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1118:
1119: use Data::Dumper;
1120: sub render_parts_summary_status {
1121: my ($resource, $part, $params) = @_;
1122: if (!$resource->is_problem()) { return '<td></td>'; }
1123: if ($params->{showParts}) {
1124: return '<td></td>';
1125: }
1126:
1127: my $td = "<td align='right'>\n";
1128: my $endtd = "</td>\n";
1129:
1130: # If there is a single part, just show the simple status
1131: if ($resource->singlepart()) {
1.253 albertel 1132: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1.225 bowersj2 1133: return $td . "<font color='" . $statusColors{$status} . "'>"
1134: . $statusStrings{$status} . "</font>" . $endtd;
1135: }
1136:
1137: # Now we can be sure the $part doesn't really matter.
1138: my $statusCount = $resource->simpleStatusCount();
1139: my @counts;
1140: foreach my $status(@statuses) {
1141: # decouple display order from the simpleStatusCount order
1142: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1143: if ($statusCount->[$slot]) {
1144: push @counts, "<font color='" . $statusColors{$status} .
1145: "'>" . $statusCount->[$slot] . ' '
1146: . $statusStrings{$status} . "</font>";
1147: }
1148: }
1149:
1.227 bowersj2 1150: return $td . $resource->countParts() . ' parts: ' . join (', ', @counts) . $endtd;
1.225 bowersj2 1151: }
1152:
1.133 bowersj2 1153: my @preparedColumns = (\&render_resource, \&render_communication_status,
1.225 bowersj2 1154: \&render_quick_status, \&render_long_status,
1155: \&render_parts_summary_status);
1.132 bowersj2 1156:
1157: sub setDefault {
1158: my ($val, $default) = @_;
1159: if (!defined($val)) { return $default; }
1160: return $val;
1161: }
1162:
1163: sub render {
1164: my $args = shift;
1.140 bowersj2 1165: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1166: my $result = '';
1167:
1.132 bowersj2 1168: # Configure the renderer.
1169: my $cols = $args->{'cols'};
1170: if (!defined($cols)) {
1171: # no columns, no nav maps.
1172: return '';
1173: }
1.140 bowersj2 1174: my $mustCloseNavMap = 0;
1175: my $navmap;
1176: if (defined($args->{'navmap'})) {
1177: $navmap = $args->{'navmap'};
1178: }
1179:
1.158 bowersj2 1180: my $r = $args->{'r'};
1.140 bowersj2 1181: my $queryString = $args->{'queryString'};
1.159 bowersj2 1182: my $jump = $args->{'jump'};
1.158 bowersj2 1183: my $here = $args->{'here'};
1.153 bowersj2 1184: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.140 bowersj2 1185: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1186: # before the current resource when using #current
1187:
1188: # If we were passed 'here' information, we are not rendering
1189: # after a folder manipulation, and we were not passed an
1190: # iterator, make sure we open the folders to show the "here"
1191: # marker
1192: my $filterHash = {};
1193: # Figure out what we're not displaying
1194: foreach (split(/\,/, $ENV{"form.filter"})) {
1195: if ($_) {
1196: $filterHash->{$_} = "1";
1197: }
1198: }
1199:
1.191 bowersj2 1200: # Filter: Remember filter function and add our own filter: Refuse
1201: # to show hidden resources unless the user can see them.
1202: my $userCanSeeHidden = advancedUser();
1203: my $filterFunc = setDefault($args->{'filterFunc'},
1204: sub {return 1;});
1205: if (!$userCanSeeHidden) {
1206: # Without renaming the filterfunc, the server seems to go into
1207: # an infinite loop
1208: my $oldFilterFunc = $filterFunc;
1209: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1210: &$oldFilterFunc($res);};
1211: }
1212:
1.140 bowersj2 1213: my $condition = 0;
1214: if ($ENV{'form.condition'}) {
1215: $condition = 1;
1216: }
1217:
1218: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1219: # Step 1: Check to see if we have a navmap
1220: if (!defined($navmap)) {
1.221 bowersj2 1221: $navmap = Apache::lonnavmaps::navmap->new();
1.140 bowersj2 1222: $mustCloseNavMap = 1;
1223: }
1224:
1225: # Step two: Locate what kind of here marker is necessary
1226: # Determine where the "here" marker is and where the screen jumps to.
1227:
1.175 bowersj2 1228: if ($ENV{'form.postsymb'}) {
1229: $here = $jump = $ENV{'form.postsymb'};
1.140 bowersj2 1230: } elsif ($ENV{'form.postdata'}) {
1231: # couldn't find a symb, is there a URL?
1232: my $currenturl = $ENV{'form.postdata'};
1.158 bowersj2 1233: #$currenturl=~s/^http\:\/\///;
1234: #$currenturl=~s/^[^\/]+//;
1.140 bowersj2 1235:
1.158 bowersj2 1236: $here = $jump = &Apache::lonnet::symbread($currenturl);
1.140 bowersj2 1237: }
1.158 bowersj2 1238:
1.140 bowersj2 1239: # Step three: Ensure the folders are open
1240: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.222 bowersj2 1241: my $curRes;
1.140 bowersj2 1242: my $found = 0;
1243:
1244: # We only need to do this if we need to open the maps to show the
1245: # current position. This will change the counter so we can't count
1246: # for the jump marker with this loop.
1.222 bowersj2 1247: while (($curRes = $mapIterator->next()) && !$found) {
1.158 bowersj2 1248: if (ref($curRes) && $curRes->symb() eq $here) {
1.140 bowersj2 1249: my $mapStack = $mapIterator->getStack();
1250:
1251: # Ensure the parent maps are open
1252: for my $map (@{$mapStack}) {
1253: if ($condition) {
1254: undef $filterHash->{$map->map_pc()};
1255: } else {
1256: $filterHash->{$map->map_pc()} = 1;
1257: }
1258: }
1259: $found = 1;
1260: }
1261: }
1.159 bowersj2 1262: }
1.140 bowersj2 1263:
1264: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1265: # If this is a click on a folder or something, we want to preserve the "here"
1266: # from the querystring, and get the new "jump" marker
1267: $here = $ENV{'form.here'};
1268: $jump = $ENV{'form.jump'};
1269: }
1270:
1.132 bowersj2 1271: my $it = $args->{'iterator'};
1272: if (!defined($it)) {
1.140 bowersj2 1273: # Construct a default iterator based on $ENV{'form.'} information
1274:
1275: # Step 1: Check to see if we have a navmap
1276: if (!defined($navmap)) {
1.221 bowersj2 1277: $navmap = Apache::lonnavmaps::navmap->new();
1.140 bowersj2 1278: $mustCloseNavMap = 1;
1279: }
1280:
1.144 bowersj2 1281: # See if we're being passed a specific map
1282: if ($args->{'iterator_map'}) {
1283: my $map = $args->{'iterator_map'};
1.145 bowersj2 1284: $map = $navmap->getResourceByUrl($map);
1.144 bowersj2 1285: my $firstResource = $map->map_start();
1286: my $finishResource = $map->map_finish();
1287:
1288: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1289: } else {
1290: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1291: }
1.132 bowersj2 1292: }
1293:
1.159 bowersj2 1294: # (re-)Locate the jump point, if any
1.191 bowersj2 1295: # Note this does not take filtering or hidden into account... need
1296: # to be fixed?
1.159 bowersj2 1297: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1.222 bowersj2 1298: my $curRes;
1.159 bowersj2 1299: my $foundJump = 0;
1300: my $counter = 0;
1301:
1.222 bowersj2 1302: while (($curRes = $mapIterator->next()) && !$foundJump) {
1.159 bowersj2 1303: if (ref($curRes)) { $counter++; }
1304:
1305: if (ref($curRes) && $jump eq $curRes->symb()) {
1306:
1307: # This is why we have to use the main iterator instead of the
1308: # potentially faster DFS: The count has to be the same, so
1309: # the order has to be the same, which DFS won't give us.
1310: $args->{'currentJumpIndex'} = $counter;
1311: $foundJump = 1;
1312: }
1313: }
1314:
1.132 bowersj2 1315: my $showParts = setDefault($args->{'showParts'}, 1);
1316: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139 bowersj2 1317: # keeps track of when the current resource is found,
1318: # so we can back up a few and put the anchor above the
1319: # current resource
1.140 bowersj2 1320: my $printKey = $args->{'printKey'};
1321: my $printCloseAll = $args->{'printCloseAll'};
1322: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.144 bowersj2 1323:
1.140 bowersj2 1324: # Print key?
1325: if ($printKey) {
1326: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1327: my $date=localtime;
1328: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1329: if ($navmap->{LAST_CHECK}) {
1330: $result .=
1.230 www 1331: '<img src="/adm/lonMisc/chat.gif"> '.&mt('New discussion since').' '.
1.140 bowersj2 1332: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1333: '</td><td align="center" valign="bottom"> '.
1.230 www 1334: '<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1.140 bowersj2 1335: '</td>';
1336: } else {
1337: $result .= '<td align="center" valign="bottom"> '.
1.230 www 1338: '<img src="/adm/lonMisc/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1339: ' <img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').
1.140 bowersj2 1340: '</td>';
1341: }
1342:
1343: $result .= '</tr></table>';
1344: }
1345:
1.172 bowersj2 1346: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.140 bowersj2 1347: if ($condition) {
1348: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1.158 bowersj2 1349: "&here=" . Apache::lonnet::escape($here) .
1.230 www 1350: "\">".&mt('Close All Folders')."</a>";
1.140 bowersj2 1351: } else {
1352: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1.158 bowersj2 1353: "&here=" . Apache::lonnet::escape($here) .
1.230 www 1354: "\">".&mt('Open All Folders')."</a>";
1.140 bowersj2 1355: }
1.143 bowersj2 1356: $result .= "<br /><br />\n";
1.140 bowersj2 1357: }
1358:
1359: if ($r) {
1360: $r->print($result);
1361: $r->rflush();
1362: $result = "";
1363: }
1.132 bowersj2 1364: # End parameter setting
1.133 bowersj2 1365:
1.132 bowersj2 1366: # Data
1.140 bowersj2 1367: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132 bowersj2 1368: my $res = "Apache::lonnavmaps::resource";
1369: my %condenseStatuses =
1370: ( $res->NETWORK_FAILURE => 1,
1371: $res->NOTHING_SET => 1,
1372: $res->CORRECT => 1 );
1373: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133 bowersj2 1374:
1375: # Shared variables
1376: $args->{'counter'} = 0; # counts the rows
1377: $args->{'indentLevel'} = 0;
1378: $args->{'isNewBranch'} = 0;
1379: $args->{'condensed'} = 0;
1380: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1381: $args->{'displayedHereMarker'} = 0;
1.132 bowersj2 1382:
1.190 bowersj2 1383: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1384: # since structure actually doesn't matter, except what map has what resources.
1385: if ($args->{'suppressEmptySequences'}) {
1386: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1387: $it->{FIRST_RESOURCE},
1388: $it->{FINISH_RESOURCE},
1389: {}, undef, 1);
1.222 bowersj2 1390: my $depth = 0;
1.190 bowersj2 1391: $dfsit->next();
1392: my $curRes = $dfsit->next();
1393: while ($depth > -1) {
1394: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1395: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1396:
1397: if (ref($curRes)) {
1398: # Parallel pre-processing: Do sequences have non-filtered-out children?
1.201 bowersj2 1399: if ($curRes->is_map()) {
1.190 bowersj2 1400: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1401: # Sequences themselves do not count as visible children,
1402: # unless those sequences also have visible children.
1403: # This means if a sequence appears, there's a "promise"
1404: # that there's something under it if you open it, somewhere.
1405: } else {
1406: # Not a sequence: if it's filtered, ignore it, otherwise
1407: # rise up the stack and mark the sequences as having children
1408: if (&$filterFunc($curRes)) {
1409: for my $sequence (@{$dfsit->getStack()}) {
1410: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1411: }
1412: }
1413: }
1414: }
1415: } continue {
1416: $curRes = $dfsit->next();
1417: }
1418: }
1419:
1.133 bowersj2 1420: my $displayedJumpMarker = 0;
1.132 bowersj2 1421: # Set up iteration.
1422: my $now = time();
1423: my $in24Hours = $now + 24 * 60 * 60;
1424: my $rownum = 0;
1425:
1.141 bowersj2 1426: # export "here" marker information
1427: $args->{'here'} = $here;
1428:
1.222 bowersj2 1429: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1430: while ($curRes = $it->next()) {
1.132 bowersj2 1431: # Maintain indentation level.
1432: if ($curRes == $it->BEGIN_MAP() ||
1433: $curRes == $it->BEGIN_BRANCH() ) {
1.133 bowersj2 1434: $args->{'indentLevel'}++;
1.132 bowersj2 1435: }
1436: if ($curRes == $it->END_MAP() ||
1437: $curRes == $it->END_BRANCH() ) {
1.133 bowersj2 1438: $args->{'indentLevel'}--;
1.132 bowersj2 1439: }
1440: # Notice new branches
1441: if ($curRes == $it->BEGIN_BRANCH()) {
1.133 bowersj2 1442: $args->{'isNewBranch'} = 1;
1443: }
1444:
1445: # If this isn't an actual resource, continue on
1446: if (!ref($curRes)) {
1447: next;
1.132 bowersj2 1448: }
1.133 bowersj2 1449:
1.143 bowersj2 1450: # If this has been filtered out, continue on
1451: if (!(&$filterFunc($curRes))) {
1452: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1453: next;
1454: }
1.132 bowersj2 1455:
1.190 bowersj2 1456: # If this is an empty sequence and we're filtering them, continue on
1.201 bowersj2 1457: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1.190 bowersj2 1458: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1459: next;
1460: }
1461:
1.153 bowersj2 1462: # If we're suppressing navmaps and this is a navmap, continue on
1463: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1464: next;
1465: }
1466:
1.191 bowersj2 1467: $args->{'counter'}++;
1468:
1.132 bowersj2 1469: # Does it have multiple parts?
1.133 bowersj2 1470: $args->{'multipart'} = 0;
1471: $args->{'condensed'} = 0;
1.132 bowersj2 1472: my @parts;
1473:
1474: # Decide what parts to show.
1.133 bowersj2 1475: if ($curRes->is_problem() && $showParts) {
1.132 bowersj2 1476: @parts = @{$curRes->parts()};
1.192 bowersj2 1477: $args->{'multipart'} = $curRes->multipart();
1.132 bowersj2 1478:
1479: if ($condenseParts) { # do the condensation
1480: if (!$curRes->opendate("0")) {
1.162 bowersj2 1481: @parts = ();
1.133 bowersj2 1482: $args->{'condensed'} = 1;
1.132 bowersj2 1483: }
1.133 bowersj2 1484: if (!$args->{'condensed'}) {
1.132 bowersj2 1485: # Decide whether to condense based on similarity
1.192 bowersj2 1486: my $status = $curRes->status($parts[0]);
1487: my $due = $curRes->duedate($parts[0]);
1488: my $open = $curRes->opendate($parts[0]);
1.132 bowersj2 1489: my $statusAllSame = 1;
1490: my $dueAllSame = 1;
1491: my $openAllSame = 1;
1.192 bowersj2 1492: for (my $i = 1; $i < scalar(@parts); $i++) {
1.132 bowersj2 1493: if ($curRes->status($parts[$i]) != $status){
1494: $statusAllSame = 0;
1495: }
1496: if ($curRes->duedate($parts[$i]) != $due ) {
1497: $dueAllSame = 0;
1498: }
1499: if ($curRes->opendate($parts[$i]) != $open) {
1500: $openAllSame = 0;
1501: }
1502: }
1503: # $*allSame is true if all the statuses were
1504: # the same. Now, if they are all the same and
1505: # match one of the statuses to condense, or they
1506: # are all open with the same due date, or they are
1507: # all OPEN_LATER with the same open date, display the
1508: # status of the first non-zero part (to get the 'correct'
1509: # status right, since 0 is never 'correct' or 'open').
1510: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1511: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1512: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.192 bowersj2 1513: @parts = ($parts[0]);
1.133 bowersj2 1514: $args->{'condensed'} = 1;
1.132 bowersj2 1515: }
1516: }
1.198 bowersj2 1517: # Multipart problem with one part: always "condense" (happens
1518: # to match the desirable behavior)
1519: if ($curRes->countParts() == 1) {
1520: @parts = ($parts[0]);
1521: $args->{'condensed'} = 1;
1522: }
1.132 bowersj2 1523: }
1.157 bowersj2 1524: }
1.132 bowersj2 1525:
1526: # If the multipart problem was condensed, "forget" it was multipart
1527: if (scalar(@parts) == 1) {
1.133 bowersj2 1528: $args->{'multipart'} = 0;
1.192 bowersj2 1529: } else {
1530: # Add part 0 so we display it correctly.
1531: unshift @parts, '0';
1.132 bowersj2 1532: }
1533:
1534: # Now, we've decided what parts to show. Loop through them and
1535: # show them.
1.192 bowersj2 1536: foreach my $part (@parts) {
1.132 bowersj2 1537: $rownum ++;
1538: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1539:
1540: $result .= " <tr bgcolor='$backgroundColor'>\n";
1.134 bowersj2 1541:
1542: # Set up some data about the parts that the cols might want
1543: my $filter = $it->{FILTER};
1544: my $stack = $it->getStack();
1545: my $src = getLinkForResource($stack);
1.249 www 1546: my $anchor='';
1547: if ($src=~s/(\#.*$)//) {
1548: $anchor=$1;
1549: }
1.134 bowersj2 1550: my $srcHasQuestion = $src =~ /\?/;
1551: $args->{"resourceLink"} = $src.
1552: ($srcHasQuestion?'&':'?') .
1.249 www 1553: 'symb=' . &Apache::lonnet::escape($curRes->symb()).
1554: $anchor;
1.132 bowersj2 1555:
1556: # Now, display each column.
1557: foreach my $col (@$cols) {
1.139 bowersj2 1558: my $colHTML = '';
1559: if (ref($col)) {
1560: $colHTML .= &$col($curRes, $part, $args);
1561: } else {
1562: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1563: }
1.132 bowersj2 1564:
1.133 bowersj2 1565: # If this is the first column and it's time to print
1566: # the anchor, do so
1567: if ($col == $cols->[0] &&
1568: $args->{'counter'} == $args->{'currentJumpIndex'} -
1.139 bowersj2 1569: $currentJumpDelta) {
1570: # Jam the anchor after the <td> tag;
1571: # necessary for valid HTML (which Mozilla requires)
1572: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133 bowersj2 1573: $displayedJumpMarker = 1;
1574: }
1.139 bowersj2 1575: $result .= $colHTML . "\n";
1.132 bowersj2 1576: }
1.139 bowersj2 1577: $result .= " </tr>\n";
1.140 bowersj2 1578: $args->{'isNewBranch'} = 0;
1.139 bowersj2 1579: }
1.153 bowersj2 1580:
1.139 bowersj2 1581: if ($r && $rownum % 20 == 0) {
1582: $r->print($result);
1583: $result = "";
1584: $r->rflush();
1.132 bowersj2 1585: }
1.156 bowersj2 1586: } continue {
1.208 bowersj2 1587: if ($r) {
1588: # If we have the connection, make sure the user is still connected
1589: my $c = $r->connection;
1590: if ($c->aborted()) {
1591: # Who cares what we do, nobody will see it anyhow.
1592: return '';
1593: }
1594: }
1.132 bowersj2 1595: }
1596:
1.134 bowersj2 1597: # Print out the part that jumps to #curloc if it exists
1.159 bowersj2 1598: # delay needed because the browser is processing the jump before
1599: # it finishes rendering, so it goes to the wrong place!
1600: # onload might be better, but this routine has no access to that.
1601: # On mozilla, the 0-millisecond timeout seems to prevent this;
1602: # it's quite likely this might fix other browsers, too, and
1603: # certainly won't hurt anything.
1.139 bowersj2 1604: if ($displayedJumpMarker) {
1.247 albertel 1605: $result .= "
1606: <script>
1607: if (location.href.indexOf('#curloc')==-1) {
1608: setTimeout(\"location += '#curloc';\", 0)
1609: }
1610: </script>";
1.134 bowersj2 1611: }
1612:
1.132 bowersj2 1613: $result .= "</table>";
1.140 bowersj2 1614:
1615: if ($r) {
1616: $r->print($result);
1617: $result = "";
1618: $r->rflush();
1619: }
1620:
1.175 bowersj2 1621: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1.132 bowersj2 1622:
1623: return $result;
1624: }
1625:
1.133 bowersj2 1626: 1;
1627:
1628: package Apache::lonnavmaps::navmap;
1629:
1630: =pod
1631:
1.216 bowersj2 1632: =head1 Object: Apache::lonnavmaps::navmap
1.133 bowersj2 1633:
1.217 bowersj2 1634: =head2 Overview
1.133 bowersj2 1635:
1.217 bowersj2 1636: The navmap object's job is to provide access to the resources
1637: in the course as Apache::lonnavmaps::resource objects, and to
1638: query and manage the relationship between those resource objects.
1639:
1640: Generally, you'll use the navmap object in one of three basic ways.
1641: In order of increasing complexity and power:
1642:
1643: =over 4
1644:
1645: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
1646: various ways to obtain resource objects, based on various identifiers.
1647: Use this when you want to request information about one object or
1648: a handful of resources you already know the identities of, from some
1649: other source. For more about Ids, Symbs, and MapPcs, see the
1650: Resource documentation. Note that Url should be a B<last resort>,
1651: not your first choice; it only works when there is only one
1652: instance of the resource in the course, which only applies to
1653: maps, and even that may change in the future.
1654:
1655: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1656: retrieves resources matching some criterion and returns them
1657: in a flat array, with no structure information. Use this when
1658: you are manipulating a series of resources, based on what map
1659: the are in, but do not care about branching, or exactly how
1660: the maps and resources are related. This is the most common case.
1661:
1662: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1663: the course's navmap in various ways without writing the traversal
1664: code yourself. See iterator documentation below. Use this when
1665: you need to know absolutely everything about the course, including
1666: branches and the precise relationship between maps and resources.
1667:
1668: =back
1669:
1670: =head2 Creation And Destruction
1671:
1672: To create a navmap object, use the following function:
1.133 bowersj2 1673:
1674: =over 4
1675:
1.221 bowersj2 1676: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1.133 bowersj2 1677:
1.221 bowersj2 1678: Creates a new navmap object. Returns the navmap object if this is
1679: successful, or B<undef> if not.
1.174 albertel 1680:
1.216 bowersj2 1681: =back
1682:
1.217 bowersj2 1683: When you are done with the $navmap object, you I<must> call
1684: $navmap->untieHashes(), or you'll prevent the current user from using that
1685: course until the web server is restarted. (!)
1686:
1.216 bowersj2 1687: =head2 Methods
1688:
1689: =over 4
1690:
1.174 albertel 1691: =item * B<getIterator>(first, finish, filter, condition):
1692:
1693: See iterator documentation below.
1.133 bowersj2 1694:
1695: =cut
1696:
1697: use strict;
1698: use GDBM_File;
1699:
1700: sub new {
1701: # magic invocation to create a class instance
1702: my $proto = shift;
1703: my $class = ref($proto) || $proto;
1704: my $self = {};
1705:
1706: # Resource cache stores navmap resources as we reference them. We generate
1707: # them on-demand so we don't pay for creating resources unless we use them.
1708: $self->{RESOURCE_CACHE} = {};
1709:
1710: # Network failure flag, if we accessed the course or user opt and
1711: # failed
1712: $self->{NETWORK_FAILURE} = 0;
1713:
1714: # tie the nav hash
1715:
1.168 bowersj2 1716: my %navmaphash;
1717: my %parmhash;
1.220 bowersj2 1718: my $courseFn = $ENV{"request.course.fn"};
1719: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1.133 bowersj2 1720: &GDBM_READER(), 0640))) {
1721: return undef;
1722: }
1723:
1.220 bowersj2 1724: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1.133 bowersj2 1725: &GDBM_READER(), 0640)))
1726: {
1.170 matthew 1727: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1728: return undef;
1729: }
1730:
1.199 bowersj2 1731: $self->{NAV_HASH} = \%navmaphash;
1.168 bowersj2 1732: $self->{PARM_HASH} = \%parmhash;
1.221 bowersj2 1733: $self->{PARM_CACHE} = {};
1.133 bowersj2 1734:
1735: bless($self);
1736:
1737: return $self;
1738: }
1739:
1.221 bowersj2 1740: sub generate_course_user_opt {
1.133 bowersj2 1741: my $self = shift;
1.221 bowersj2 1742: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1.133 bowersj2 1743:
1.221 bowersj2 1744: my $uname=$ENV{'user.name'};
1745: my $udom=$ENV{'user.domain'};
1746: my $uhome=$ENV{'user.home'};
1747: my $cid=$ENV{'request.course.id'};
1748: my $chome=$ENV{'course.'.$cid.'.home'};
1749: my ($cdom,$cnum)=split(/\_/,$cid);
1750:
1751: my $userprefix=$uname.'_'.$udom.'_';
1752:
1753: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1754: unless ($uhome eq 'no_host') {
1.133 bowersj2 1755: # ------------------------------------------------- Get coursedata (if present)
1.221 bowersj2 1756: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1757: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1758: ':resourcedata',$chome);
1759: # Check for network failure
1760: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1761: $self->{NETWORK_FAILURE} = 1;
1762: } elsif ($reply!~/^error\:/) {
1763: $courserdatas{$cid}=$reply;
1764: $courserdatas{$cid.'.last_cache'}=time;
1765: }
1766: }
1767: foreach (split(/\&/,$courserdatas{$cid})) {
1768: my ($name,$value)=split(/\=/,$_);
1769: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1770: &Apache::lonnet::unescape($value);
1771: }
1.133 bowersj2 1772: # --------------------------------------------------- Get userdata (if present)
1.221 bowersj2 1773: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1774: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1775: if ($reply!~/^error\:/) {
1776: $userrdatas{$uname.'___'.$udom}=$reply;
1777: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1778: }
1779: # check to see if network failed
1780: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1781: {
1782: $self->{NETWORK_FAILURE} = 1;
1783: }
1784: }
1785: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1786: my ($name,$value)=split(/\=/,$_);
1787: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1788: &Apache::lonnet::unescape($value);
1789: }
1790: $self->{COURSE_OPT} = \%courseopt;
1791: $self->{USER_OPT} = \%useropt;
1792: }
1793:
1794: $self->{COURSE_USER_OPT_GENERATED} = 1;
1795:
1796: return;
1797: }
1798:
1799: sub generate_email_discuss_status {
1800: my $self = shift;
1801: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1.133 bowersj2 1802:
1.221 bowersj2 1803: my $cid=$ENV{'request.course.id'};
1804: my ($cdom,$cnum)=split(/\_/,$cid);
1805:
1806: my %emailstatus = &Apache::lonnet::dump('email_status');
1807: my $logoutTime = $emailstatus{'logout'};
1808: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1809: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1810: $courseLeaveTime : $logoutTime);
1811: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1812: $cdom, $cnum);
1813: my %feedback=();
1814: my %error=();
1815: my $keys = &Apache::lonnet::reply('keys:'.
1816: $ENV{'user.domain'}.':'.
1817: $ENV{'user.name'}.':nohist_email',
1818: $ENV{'user.home'});
1819:
1820: foreach my $msgid (split(/\&/, $keys)) {
1821: $msgid=&Apache::lonnet::unescape($msgid);
1822: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1823: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1824: my ($what,$url)=($1,$2);
1825: my %status=
1826: &Apache::lonnet::get('email_status',[$msgid]);
1827: if ($status{$msgid}=~/^error\:/) {
1828: $status{$msgid}='';
1829: }
1830:
1831: if (($status{$msgid} eq 'new') ||
1832: (!$status{$msgid})) {
1833: if ($what eq 'Error') {
1834: $error{$url}.=','.$msgid;
1835: } else {
1836: $feedback{$url}.=','.$msgid;
1837: }
1838: }
1839: }
1.211 bowersj2 1840: }
1.221 bowersj2 1841:
1842: $self->{FEEDBACK} = \%feedback;
1843: $self->{ERROR_MSG} = \%error; # what is this? JB
1844: $self->{DISCUSSION_TIME} = \%discussiontime;
1845: $self->{EMAIL_STATUS} = \%emailstatus;
1846:
1847: $self->{EMAIL_DISCUSS_GENERATED} = 1;
1848: }
1849:
1850: sub get_user_data {
1851: my $self = shift;
1852: if ($self->{RETRIEVED_USER_DATA}) { return; }
1.211 bowersj2 1853:
1.221 bowersj2 1854: # Retrieve performance data on problems
1855: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1856: $ENV{'user.domain'},
1857: $ENV{'user.name'});
1858: $self->{STUDENT_DATA} = \%student_data;
1.133 bowersj2 1859:
1.221 bowersj2 1860: $self->{RETRIEVED_USER_DATA} = 1;
1.133 bowersj2 1861: }
1862:
1863: # Internal function: Takes a key to look up in the nav hash and implements internal
1864: # memory caching of that key.
1865: sub navhash {
1866: my $self = shift; my $key = shift;
1867: return $self->{NAV_HASH}->{$key};
1868: }
1869:
1.217 bowersj2 1870: =pod
1871:
1872: =item * B<courseMapDefined>(): Returns true if the course map is defined,
1873: false otherwise. Undefined course maps indicate an error somewhere in
1874: LON-CAPA, and you will not be able to proceed with using the navmap.
1875: See the B<NAV> screen for an example of using this.
1876:
1877: =cut
1878:
1.133 bowersj2 1879: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1880: sub courseMapDefined {
1881: my $self = shift;
1882: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1883:
1884: my $firstres = $self->navhash("map_start_$uri");
1885: my $lastres = $self->navhash("map_finish_$uri");
1886: return $firstres && $lastres;
1887: }
1888:
1889: sub getIterator {
1890: my $self = shift;
1891: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1892: shift, undef, shift);
1893: return $iterator;
1894: }
1895:
1896: # unties the hash when done
1897: sub untieHashes {
1.168 bowersj2 1898: my $self = shift;
1.170 matthew 1899: untie %{$self->{NAV_HASH}};
1900: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1901: }
1902:
1903: # Private method: Does the given resource (as a symb string) have
1904: # current discussion? Returns 0 if chat/mail data not extracted.
1905: sub hasDiscussion {
1906: my $self = shift;
1907: my $symb = shift;
1.221 bowersj2 1908:
1909: $self->generate_email_discuss_status();
1910:
1.133 bowersj2 1911: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1912:
1913: #return defined($self->{DISCUSSION_TIME}->{$symb});
1914: return $self->{DISCUSSION_TIME}->{$symb} >
1915: $self->{LAST_CHECK};
1916: }
1917:
1918: # Private method: Does the given resource (as a symb string) have
1919: # current feedback? Returns the string in the feedback hash, which
1920: # will be false if it does not exist.
1921: sub getFeedback {
1922: my $self = shift;
1923: my $symb = shift;
1924:
1.221 bowersj2 1925: $self->generate_email_discuss_status();
1926:
1.133 bowersj2 1927: if (!defined($self->{FEEDBACK})) { return ""; }
1928:
1929: return $self->{FEEDBACK}->{$symb};
1930: }
1931:
1932: # Private method: Get the errors for that resource (by source).
1933: sub getErrors {
1934: my $self = shift;
1935: my $src = shift;
1.221 bowersj2 1936:
1937: $self->generate_email_discuss_status();
1938:
1.133 bowersj2 1939: if (!defined($self->{ERROR_MSG})) { return ""; }
1940: return $self->{ERROR_MSG}->{$src};
1941: }
1942:
1943: =pod
1944:
1.174 albertel 1945: =item * B<getById>(id):
1946:
1947: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1948: object for that resource. This method, or other methods that use it
1949: (as in the resource object) is the only proper way to obtain a
1950: resource object.
1.133 bowersj2 1951:
1.194 bowersj2 1952: =item * B<getBySymb>(symb):
1953:
1954: Based on the symb of the resource, get a resource object for that
1955: resource. This is one of the proper ways to get a resource object.
1956:
1957: =item * B<getMapByMapPc>(map_pc):
1958:
1959: Based on the map_pc of the resource, get a resource object for
1960: the given map. This is one of the proper ways to get a resource object.
1961:
1.133 bowersj2 1962: =cut
1963:
1964: # The strategy here is to cache the resource objects, and only construct them
1965: # as we use them. The real point is to prevent reading any more from the tied
1966: # hash then we have to, which should hopefully alleviate speed problems.
1967:
1968: sub getById {
1969: my $self = shift;
1970: my $id = shift;
1971:
1972: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1973: {
1974: return $self->{RESOURCE_CACHE}->{$id};
1975: }
1976:
1977: # resource handles inserting itself into cache.
1978: # Not clear why the quotes are necessary, but as of this
1979: # writing it doesn't work without them.
1980: return "Apache::lonnavmaps::resource"->new($self, $id);
1.132 bowersj2 1981: }
1.133 bowersj2 1982:
1.172 bowersj2 1983: sub getBySymb {
1984: my $self = shift;
1985: my $symb = shift;
1.228 albertel 1986: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1.172 bowersj2 1987: my $map = $self->getResourceByUrl($mapUrl);
1988: return $self->getById($map->map_pc() . '.' . $id);
1.194 bowersj2 1989: }
1990:
1991: sub getByMapPc {
1992: my $self = shift;
1993: my $map_pc = shift;
1994: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
1995: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
1996: return $self->getById($map_id);
1.172 bowersj2 1997: }
1998:
1.133 bowersj2 1999: =pod
2000:
1.174 albertel 2001: =item * B<firstResource>():
2002:
2003: Returns a resource object reference corresponding to the first
2004: resource in the navmap.
1.133 bowersj2 2005:
2006: =cut
2007:
2008: sub firstResource {
2009: my $self = shift;
2010: my $firstResource = $self->navhash('map_start_' .
2011: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2012: return $self->getById($firstResource);
1.132 bowersj2 2013: }
1.133 bowersj2 2014:
2015: =pod
2016:
1.174 albertel 2017: =item * B<finishResource>():
2018:
2019: Returns a resource object reference corresponding to the last resource
2020: in the navmap.
1.133 bowersj2 2021:
2022: =cut
2023:
2024: sub finishResource {
2025: my $self = shift;
2026: my $firstResource = $self->navhash('map_finish_' .
2027: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2028: return $self->getById($firstResource);
1.132 bowersj2 2029: }
1.133 bowersj2 2030:
2031: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2032: # the actual lookup; parmval caches the results.
2033: sub parmval {
2034: my $self = shift;
2035: my ($what,$symb)=@_;
2036: my $hashkey = $what."|||".$symb;
2037:
2038: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2039: return $self->{PARM_CACHE}->{$hashkey};
2040: }
2041:
2042: my $result = $self->parmval_real($what, $symb);
2043: $self->{PARM_CACHE}->{$hashkey} = $result;
2044: return $result;
1.132 bowersj2 2045: }
2046:
1.133 bowersj2 2047: sub parmval_real {
2048: my $self = shift;
1.219 albertel 2049: my ($what,$symb,$recurse) = @_;
1.133 bowersj2 2050:
1.221 bowersj2 2051: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2052: $self->generate_course_user_opt();
2053:
1.133 bowersj2 2054: my $cid=$ENV{'request.course.id'};
2055: my $csec=$ENV{'request.course.sec'};
2056: my $uname=$ENV{'user.name'};
2057: my $udom=$ENV{'user.domain'};
2058:
2059: unless ($symb) { return ''; }
2060: my $result='';
2061:
1.226 www 2062: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
1.133 bowersj2 2063:
2064: # ----------------------------------------------------- Cascading lookup scheme
2065: my $rwhat=$what;
2066: $what=~s/^parameter\_//;
2067: $what=~s/\_/\./;
2068:
2069: my $symbparm=$symb.'.'.$what;
2070: my $mapparm=$mapname.'___(all).'.$what;
2071: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2072:
2073: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2074: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2075: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2076:
2077: my $courselevel= $usercourseprefix.'.'.$what;
2078: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2079: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2080:
2081: my $useropt = $self->{USER_OPT};
2082: my $courseopt = $self->{COURSE_OPT};
2083: my $parmhash = $self->{PARM_HASH};
2084:
2085: # ---------------------------------------------------------- first, check user
2086: if ($uname and defined($useropt)) {
2087: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2088: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2089: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2090: }
2091:
2092: # ------------------------------------------------------- second, check course
2093: if ($csec and defined($courseopt)) {
2094: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2095: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2096: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2097: }
2098:
2099: if (defined($courseopt)) {
2100: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2101: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2102: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2103: }
2104:
2105: # ----------------------------------------------------- third, check map parms
2106:
2107: my $thisparm=$$parmhash{$symbparm};
2108: if (defined($thisparm)) { return $thisparm; }
2109:
2110: # ----------------------------------------------------- fourth , check default
2111:
1.246 albertel 2112: my $meta_rwhat=$rwhat;
2113: $meta_rwhat=~s/\./_/g;
2114: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2115: if (defined($default)) { return $default}
2116: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
1.133 bowersj2 2117: if (defined($default)) { return $default}
2118:
2119: # --------------------------------------------------- fifth , cascade up parts
2120:
2121: my ($space,@qualifier)=split(/\./,$rwhat);
2122: my $qualifier=join('.',@qualifier);
2123: unless ($space eq '0') {
1.160 albertel 2124: my @parts=split(/_/,$space);
2125: my $id=pop(@parts);
2126: my $part=join('_',@parts);
2127: if ($part eq '') { $part='0'; }
1.219 albertel 2128: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
1.160 albertel 2129: if (defined($partgeneral)) { return $partgeneral; }
1.133 bowersj2 2130: }
1.219 albertel 2131: if ($recurse) { return undef; }
2132: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2133: if (defined($pack_def)) { return $pack_def; }
1.133 bowersj2 2134: return '';
1.145 bowersj2 2135: }
2136:
1.174 albertel 2137: =pod
1.145 bowersj2 2138:
1.174 albertel 2139: =item * B<getResourceByUrl>(url):
1.145 bowersj2 2140:
1.174 albertel 2141: Retrieves a resource object by URL of the resource. If passed a
2142: resource object, it will simply return it, so it is safe to use this
2143: method in code like "$res = $navmap->getResourceByUrl($res)", if
2144: you're not sure if $res is already an object, or just a URL. If the
2145: resource appears multiple times in the course, only the first instance
2146: will be returned. As a result, this is probably useful only for maps.
2147:
2148: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2149:
2150: The map is a specification of a map to retreive the resources from,
2151: either as a url or as an object. The filterFunc is a reference to a
2152: function that takes a resource object as its one argument and returns
2153: true if the resource should be included, or false if it should not
2154: be. If recursive is true, the map will be recursively examined,
2155: otherwise it will not be. If bailout is true, the function will return
2156: as soon as it finds a resource, if false it will finish. By default,
2157: the map is the top-level map of the course, filterFunc is a function
2158: that always returns 1, recursive is true, bailout is false. The
2159: resources will be returned in a list containing the resource objects
2160: for the corresponding resources, with B<no structure information> in
2161: the list; regardless of branching, recursion, etc., it will be a flat
2162: list.
2163:
2164: Thus, this is suitable for cases where you don't want the structure,
2165: just a list of all resources. It is also suitable for finding out how
2166: many resources match a given description; for this use, if all you
2167: want to know is if I<any> resources match the description, the bailout
2168: parameter will allow you to avoid potentially expensive enumeration of
2169: all matching resources.
1.145 bowersj2 2170:
1.174 albertel 2171: =item * B<hasResources>(map, filterFunc, recursive):
1.145 bowersj2 2172:
1.174 albertel 2173: Convience method for
1.146 bowersj2 2174:
2175: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2176:
1.174 albertel 2177: which will tell whether the map has resources matching the description
2178: in the filter function.
1.146 bowersj2 2179:
1.145 bowersj2 2180: =cut
2181:
2182: sub getResourceByUrl {
2183: my $self = shift;
2184: my $resUrl = shift;
2185:
2186: if (ref($resUrl)) { return $resUrl; }
2187:
2188: $resUrl = &Apache::lonnet::clutter($resUrl);
2189: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2190: if ($resId =~ /,/) {
2191: $resId = (split (/,/, $resId))[0];
2192: }
2193: if (!$resId) { return ''; }
2194: return $self->getById($resId);
2195: }
2196:
2197: sub retrieveResources {
2198: my $self = shift;
2199: my $map = shift;
2200: my $filterFunc = shift;
2201: if (!defined ($filterFunc)) {
2202: $filterFunc = sub {return 1;};
2203: }
2204: my $recursive = shift;
2205: if (!defined($recursive)) { $recursive = 1; }
2206: my $bailout = shift;
2207: if (!defined($bailout)) { $bailout = 0; }
2208:
2209: # Create the necessary iterator.
2210: if (!ref($map)) { # assume it's a url of a map.
1.172 bowersj2 2211: $map = $self->getResourceByUrl($map);
1.145 bowersj2 2212: }
2213:
1.213 bowersj2 2214: # If nothing was passed, assume top-level map
2215: if (!$map) {
2216: $map = $self->getById('0.0');
2217: }
2218:
1.145 bowersj2 2219: # Check the map's validity.
1.213 bowersj2 2220: if (!$map->is_map()) {
1.145 bowersj2 2221: # Oh, to throw an exception.... how I'd love that!
2222: return ();
2223: }
2224:
1.146 bowersj2 2225: # Get an iterator.
2226: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1.215 bowersj2 2227: undef, $recursive);
1.146 bowersj2 2228:
2229: my @resources = ();
2230:
2231: # Run down the iterator and collect the resources.
1.222 bowersj2 2232: my $curRes;
2233:
2234: while ($curRes = $it->next()) {
1.146 bowersj2 2235: if (ref($curRes)) {
2236: if (!&$filterFunc($curRes)) {
2237: next;
2238: }
2239:
2240: push @resources, $curRes;
2241:
2242: if ($bailout) {
2243: return @resources;
2244: }
2245: }
2246:
2247: }
2248:
2249: return @resources;
2250: }
2251:
2252: sub hasResource {
2253: my $self = shift;
2254: my $map = shift;
2255: my $filterFunc = shift;
2256: my $recursive = shift;
2257:
2258: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1.133 bowersj2 2259: }
1.51 bowersj2 2260:
2261: 1;
2262:
2263: package Apache::lonnavmaps::iterator;
2264:
2265: =pod
2266:
2267: =back
2268:
1.174 albertel 2269: =head1 Object: navmap Iterator
1.51 bowersj2 2270:
1.174 albertel 2271: An I<iterator> encapsulates the logic required to traverse a data
2272: structure. navmap uses an iterator to traverse the course map
2273: according to the criteria you wish to use.
2274:
2275: To obtain an iterator, call the B<getIterator>() function of a
2276: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2277: directly.) This will return a reference to the iterator:
1.51 bowersj2 2278:
2279: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2280:
2281: To get the next thing from the iterator, call B<next>:
2282:
2283: C<my $nextThing = $resourceIterator-E<gt>next()>
2284:
2285: getIterator behaves as follows:
2286:
2287: =over 4
2288:
1.174 albertel 2289: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2290:
2291: All parameters are optional. firstResource is a resource reference
2292: corresponding to where the iterator should start. It defaults to
2293: navmap->firstResource() for the corresponding nav map. finishResource
2294: corresponds to where you want the iterator to end, defaulting to
2295: navmap->finishResource(). filterHash is a hash used as a set
2296: containing strings representing the resource IDs, defaulting to
2297: empty. Condition is a 1 or 0 that sets what to do with the filter
1.205 bowersj2 2298: hash: If a 0, then only resources that exist IN the filterHash will be
1.174 albertel 2299: recursed on. If it is a 1, only resources NOT in the filterHash will
2300: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2301: false (default), the iterator will only return the first level of map
2302: that is not just a single, 'redirecting' map. If true, the iterator
2303: will return all information, starting with the top-level map,
2304: regardless of content. returnTopMap, if true (default false), will
2305: cause the iterator to return the top-level map object (resource 0.0)
2306: before anything else.
2307:
2308: Thus, by default, only top-level resources will be shown. Change the
2309: condition to a 1 without changing the hash, and all resources will be
2310: shown. Changing the condition to 1 and including some values in the
2311: hash will allow you to selectively suppress parts of the navmap, while
2312: leaving it on 0 and adding things to the hash will allow you to
2313: selectively add parts of the nav map. See the handler code for
2314: examples.
2315:
2316: The iterator will return either a reference to a resource object, or a
2317: token representing something in the map, such as the beginning of a
2318: new branch. The possible tokens are:
2319:
2320: =over 4
1.51 bowersj2 2321:
1.222 bowersj2 2322: =item * B<END_ITERATOR>:
2323:
2324: The iterator has returned all that it's going to. Further calls to the
2325: iterator will just produce more of these. This is a "false" value, and
2326: is the only false value the iterator which will be returned, so it can
2327: be used as a loop sentinel.
2328:
1.217 bowersj2 2329: =item * B<BEGIN_MAP>:
1.51 bowersj2 2330:
1.174 albertel 2331: A new map is being recursed into. This is returned I<after> the map
2332: resource itself is returned.
1.51 bowersj2 2333:
1.217 bowersj2 2334: =item * B<END_MAP>:
1.174 albertel 2335:
2336: The map is now done.
1.51 bowersj2 2337:
1.217 bowersj2 2338: =item * B<BEGIN_BRANCH>:
1.70 bowersj2 2339:
1.174 albertel 2340: A branch is now starting. The next resource returned will be the first
2341: in that branch.
1.70 bowersj2 2342:
1.217 bowersj2 2343: =item * B<END_BRANCH>:
1.70 bowersj2 2344:
1.174 albertel 2345: The branch is now done.
1.51 bowersj2 2346:
2347: =back
2348:
1.174 albertel 2349: The tokens are retreivable via methods on the iterator object, i.e.,
2350: $iterator->END_MAP.
1.70 bowersj2 2351:
1.174 albertel 2352: Maps can contain empty resources. The iterator will automatically skip
2353: over such resources, but will still treat the structure
2354: correctly. Thus, a complicated map with several branches, but
2355: consisting entirely of empty resources except for one beginning or
2356: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2357: but only one resource will be returned.
1.116 bowersj2 2358:
1.242 matthew 2359: =back
2360:
1.222 bowersj2 2361: =head2 Normal Usage
2362:
2363: Normal usage of the iterator object is to do the following:
2364:
2365: my $it = $navmap->getIterator([your params here]);
2366: my $curRes;
2367: while ($curRes = $it->next()) {
2368: [your logic here]
2369: }
2370:
2371: Note that inside of the loop, it's frequently useful to check if
2372: "$curRes" is a reference or not with the reference function; only
2373: resource objects will be references, and any non-references will
2374: be the tokens described above.
2375:
2376: Also note there is some old code floating around that trys to track
2377: the depth of the iterator to see when it's done; do not copy that
2378: code. It is difficult to get right and harder to understand then
2379: this. They should be migrated to this new style.
1.51 bowersj2 2380:
2381: =cut
2382:
2383: # Here are the tokens for the iterator:
2384:
1.222 bowersj2 2385: sub END_ITERATOR { return 0; }
1.51 bowersj2 2386: sub BEGIN_MAP { return 1; } # begining of a new map
2387: sub END_MAP { return 2; } # end of the map
2388: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2389: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 2390: sub FORWARD { return 1; } # go forward
2391: sub BACKWARD { return 2; }
1.51 bowersj2 2392:
1.96 bowersj2 2393: sub min {
2394: (my $a, my $b) = @_;
2395: if ($a < $b) { return $a; } else { return $b; }
2396: }
2397:
1.94 bowersj2 2398: sub new {
2399: # magic invocation to create a class instance
2400: my $proto = shift;
2401: my $class = ref($proto) || $proto;
2402: my $self = {};
2403:
2404: $self->{NAV_MAP} = shift;
2405: return undef unless ($self->{NAV_MAP});
2406:
2407: # Handle the parameters
2408: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2409: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2410:
2411: # If the given resources are just the ID of the resource, get the
2412: # objects
2413: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2414: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2415: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2416: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2417:
2418: $self->{FILTER} = shift;
2419:
2420: # A hash, used as a set, of resource already seen
2421: $self->{ALREADY_SEEN} = shift;
2422: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2423: $self->{CONDITION} = shift;
2424:
1.116 bowersj2 2425: # Do we want to automatically follow "redirection" maps?
2426: $self->{FORCE_TOP} = shift;
2427:
1.162 bowersj2 2428: # Do we want to return the top-level map object (resource 0.0)?
2429: $self->{RETURN_0} = shift;
2430: # have we done that yet?
2431: $self->{HAVE_RETURNED_0} = 0;
2432:
1.94 bowersj2 2433: # Now, we need to pre-process the map, by walking forward and backward
2434: # over the parts of the map we're going to look at.
1.96 bowersj2 2435:
1.97 bowersj2 2436: # The processing steps are exactly the same, except for a few small
2437: # changes, so I bundle those up in the following list of two elements:
2438: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2439: # first_resource).
2440: # This prevents writing nearly-identical code twice.
2441: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2442: 'FIRST_RESOURCE'],
2443: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2444: 'FINISH_RESOURCE'] );
2445:
1.98 bowersj2 2446: my $maxDepth = 0; # tracks max depth
2447:
1.116 bowersj2 2448: # If there is only one resource in this map, and it's a map, we
2449: # want to remember that, so the user can ask for the first map
2450: # that isn't just a redirector.
2451: my $resource; my $resourceCount = 0;
2452:
1.209 bowersj2 2453: # Documentation on this algorithm can be found in the CVS repository at
2454: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2455: # in that file.
1.107 bowersj2 2456: # **1**
2457:
1.97 bowersj2 2458: foreach my $pass (@iterations) {
2459: my $direction = $pass->[0];
2460: my $valName = $pass->[1];
2461: my $nextResourceMethod = $pass->[2];
2462: my $firstResourceName = $pass->[3];
2463:
2464: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2465: $self->{FIRST_RESOURCE},
2466: $self->{FINISH_RESOURCE},
2467: {}, undef, 0, $direction);
1.96 bowersj2 2468:
1.97 bowersj2 2469: # prime the recursion
2470: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.222 bowersj2 2471: $iterator->next();
1.97 bowersj2 2472: my $curRes = $iterator->next();
1.222 bowersj2 2473: my $depth = 1;
2474: while ($depth > 0) {
2475: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2476: if ($curRes == $iterator->END_MAP()) { $depth--; }
2477:
1.97 bowersj2 2478: if (ref($curRes)) {
1.116 bowersj2 2479: # If there's only one resource, this will save it
1.117 bowersj2 2480: # we have to filter empty resources from consideration here,
2481: # or even "empty", redirecting maps have two (start & finish)
2482: # or three (start, finish, plus redirector)
2483: if($direction == FORWARD && $curRes->src()) {
2484: $resource = $curRes; $resourceCount++;
2485: }
1.97 bowersj2 2486: my $resultingVal = $curRes->{DATA}->{$valName};
2487: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 2488: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 2489:
1.116 bowersj2 2490: if ($nextCount == 1) { # **3**
1.97 bowersj2 2491: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2492: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2493: }
2494:
1.116 bowersj2 2495: if ($nextCount > 1) { # **4**
1.97 bowersj2 2496: foreach my $res (@{$nextResources}) {
2497: my $current = $res->{DATA}->{$valName} || 999999999;
2498: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2499: }
2500: }
2501: }
1.96 bowersj2 2502:
1.107 bowersj2 2503: # Assign the final val (**2**)
1.97 bowersj2 2504: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 2505: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2506: $curRes->{DATA}->{BOT_UP_VAL});
2507:
2508: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2509: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1.190 bowersj2 2510: }
1.222 bowersj2 2511:
2512: $curRes = $iterator->next();
1.96 bowersj2 2513: }
2514: }
1.94 bowersj2 2515:
1.116 bowersj2 2516: # Check: Was this only one resource, a map?
1.255 ! albertel 2517: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
1.116 bowersj2 2518: my $firstResource = $resource->map_start();
2519: my $finishResource = $resource->map_finish();
2520: return
2521: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2522: $finishResource, $self->{FILTER},
2523: $self->{ALREADY_SEEN},
2524: $self->{CONDITION}, 0);
2525:
2526: }
2527:
1.98 bowersj2 2528: # Set up some bookkeeping information.
2529: $self->{CURRENT_DEPTH} = 0;
2530: $self->{MAX_DEPTH} = $maxDepth;
2531: $self->{STACK} = [];
2532: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1.222 bowersj2 2533: $self->{FINISHED} = 0; # When true, the iterator has finished
1.98 bowersj2 2534:
2535: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2536: push @{$self->{STACK}}, [];
2537: }
2538:
1.107 bowersj2 2539: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 2540: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2541: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2542:
2543: bless ($self);
2544:
2545: return $self;
2546: }
2547:
2548: sub next {
2549: my $self = shift;
1.162 bowersj2 2550:
1.222 bowersj2 2551: if ($self->{FINISHED}) {
2552: return END_ITERATOR();
2553: }
2554:
1.162 bowersj2 2555: # If we want to return the top-level map object, and haven't yet,
2556: # do so.
2557: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2558: $self->{HAVE_RETURNED_0} = 1;
2559: return $self->{NAV_MAP}->getById('0.0');
2560: }
1.98 bowersj2 2561:
2562: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2563: # grab the next from the recursive iterator
2564: my $next = $self->{RECURSIVE_ITERATOR}->next();
2565:
2566: # is it a begin or end map? If so, update the depth
2567: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2568: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2569:
2570: # Are we back at depth 0? If so, stop recursing
2571: if ($self->{RECURSIVE_DEPTH} == 0) {
2572: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2573: }
2574:
2575: return $next;
2576: }
2577:
2578: if (defined($self->{FORCE_NEXT})) {
2579: my $tmp = $self->{FORCE_NEXT};
2580: $self->{FORCE_NEXT} = undef;
2581: return $tmp;
2582: }
2583:
2584: # Have we not yet begun? If not, return BEGIN_MAP and
2585: # remember we've started.
2586: if ( !$self->{STARTED} ) {
2587: $self->{STARTED} = 1;
2588: return $self->BEGIN_MAP();
2589: }
2590:
2591: # Here's the guts of the iterator.
2592:
2593: # Find the next resource, if any.
2594: my $found = 0;
2595: my $i = $self->{MAX_DEPTH};
2596: my $newDepth;
2597: my $here;
2598: while ( $i >= 0 && !$found ) {
1.107 bowersj2 2599: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2600: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 2601: $found = 1;
2602: $newDepth = $i;
2603: }
2604: $i--;
2605: }
2606:
2607: # If we still didn't find anything, we're done.
2608: if ( !$found ) {
2609: # We need to get back down to the correct branch depth
2610: if ( $self->{CURRENT_DEPTH} > 0 ) {
2611: $self->{CURRENT_DEPTH}--;
2612: return END_BRANCH();
2613: } else {
1.222 bowersj2 2614: $self->{FINISHED} = 1;
1.98 bowersj2 2615: return END_MAP();
2616: }
2617: }
2618:
1.104 bowersj2 2619: # If this is not a resource, it must be an END_BRANCH marker we want
2620: # to return directly.
1.107 bowersj2 2621: if (!ref($here)) { # **8**
1.104 bowersj2 2622: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2623: $self->{CURRENT_DEPTH}--;
2624: return $here;
2625: }
2626: }
2627:
2628: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2629: $self->{HERE} = $here;
2630:
1.98 bowersj2 2631: # Get to the right level
2632: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2633: push @{$self->{STACK}->[$newDepth]}, $here;
2634: $self->{CURRENT_DEPTH}--;
2635: return END_BRANCH();
2636: }
2637: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2638: push @{$self->{STACK}->[$newDepth]}, $here;
2639: $self->{CURRENT_DEPTH}++;
2640: return BEGIN_BRANCH();
2641: }
2642:
2643: # If we made it here, we have the next resource, and we're at the
2644: # right branch level. So let's examine the resource for where
2645: # we can get to from here.
2646:
2647: # So we need to look at all the resources we can get to from here,
2648: # categorize them if we haven't seen them, remember if we have a new
2649: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 2650: my $maxDepthAdded = -1;
2651:
1.98 bowersj2 2652: for (@$nextUnfiltered) {
2653: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 2654: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2655: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 2656: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 2657: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 2658: }
2659: }
1.104 bowersj2 2660:
2661: # Is this the end of a branch? If so, all of the resources examined above
2662: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2663: # marker onto the stack so we don't forget.
2664: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2665: # BC branch and gets to C, it will see F as the only next resource, but it's
2666: # one level lower. Thus, this is the end of the branch, since there are no
2667: # more resources added to this level or above.
1.111 bowersj2 2668: # We don't do this if the examined resource is the finish resource,
2669: # because the condition given above is true, but the "END_MAP" will
2670: # take care of things and we should already be at depth 0.
1.104 bowersj2 2671: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 2672: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 2673: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2674: }
2675:
1.98 bowersj2 2676: # That ends the main iterator logic. Now, do we want to recurse
2677: # down this map (if this resource is a map)?
2678: if ($self->{HERE}->is_map() &&
2679: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2680: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2681: my $firstResource = $self->{HERE}->map_start();
2682: my $finishResource = $self->{HERE}->map_finish();
2683:
2684: $self->{RECURSIVE_ITERATOR} =
2685: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2686: $finishResource, $self->{FILTER},
2687: $self->{ALREADY_SEEN}, $self->{CONDITION});
2688: }
2689:
1.116 bowersj2 2690: # If this is a blank resource, don't actually return it.
1.117 bowersj2 2691: # Should you ever find you need it, make sure to add an option to the code
2692: # that you can use; other things depend on this behavior.
1.138 bowersj2 2693: my $browsePriv = $self->{HERE}->browsePriv();
2694: if (!$self->{HERE}->src() ||
2695: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.116 bowersj2 2696: return $self->next();
2697: }
2698:
1.98 bowersj2 2699: return $self->{HERE};
2700:
2701: }
2702:
2703: =pod
2704:
1.174 albertel 2705: The other method available on the iterator is B<getStack>, which
2706: returns an array populated with the current 'stack' of maps, as
2707: references to the resource objects. Example: This is useful when
2708: making the navigation map, as we need to check whether we are under a
2709: page map to see if we need to link directly to the resource, or to the
2710: page. The first elements in the array will correspond to the top of
2711: the stack (most inclusive map).
1.98 bowersj2 2712:
2713: =cut
2714:
2715: sub getStack {
2716: my $self=shift;
2717:
2718: my @stack;
2719:
2720: $self->populateStack(\@stack);
2721:
2722: return \@stack;
2723: }
2724:
2725: # Private method: Calls the iterators recursively to populate the stack.
2726: sub populateStack {
2727: my $self=shift;
2728: my $stack = shift;
2729:
2730: push @$stack, $self->{HERE} if ($self->{HERE});
2731:
2732: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2733: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2734: }
1.94 bowersj2 2735: }
2736:
2737: 1;
2738:
2739: package Apache::lonnavmaps::DFSiterator;
2740:
1.100 bowersj2 2741: # Not documented in the perldoc: This is a simple iterator that just walks
2742: # through the nav map and presents the resources in a depth-first search
2743: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2744: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2745: # useful for pre-processing of some kind, and is in fact used by the main
2746: # iterator that way, but that's about it.
2747: # One could imagine merging this into the init routine of the main iterator,
1.251 www 2748: # but this might as well be left separate, since it is possible some other
1.100 bowersj2 2749: # use might be found for it. - Jeremy
1.94 bowersj2 2750:
1.117 bowersj2 2751: # Unlike the main iterator, this DOES return all resources, even blank ones.
2752: # The main iterator needs them to correctly preprocess the map.
2753:
1.94 bowersj2 2754: sub BEGIN_MAP { return 1; } # begining of a new map
2755: sub END_MAP { return 2; } # end of the map
2756: sub FORWARD { return 1; } # go forward
2757: sub BACKWARD { return 2; }
2758:
1.100 bowersj2 2759: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2760: # filter hash ref (or undef), already seen hash or undef, condition
2761: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 2762: sub new {
2763: # magic invocation to create a class instance
2764: my $proto = shift;
2765: my $class = ref($proto) || $proto;
2766: my $self = {};
2767:
2768: $self->{NAV_MAP} = shift;
2769: return undef unless ($self->{NAV_MAP});
2770:
2771: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2772: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2773:
2774: # If the given resources are just the ID of the resource, get the
2775: # objects
2776: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2777: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2778: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2779: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2780:
2781: $self->{FILTER} = shift;
2782:
2783: # A hash, used as a set, of resource already seen
2784: $self->{ALREADY_SEEN} = shift;
1.140 bowersj2 2785: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 2786: $self->{CONDITION} = shift;
1.89 bowersj2 2787: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 2788:
1.100 bowersj2 2789: # Flag: Have we started yet?
1.51 bowersj2 2790: $self->{STARTED} = 0;
2791:
2792: # Should we continue calling the recursive iterator, if any?
2793: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2794: # The recursive iterator, if any
2795: $self->{RECURSIVE_ITERATOR} = undef;
2796: # Are we recursing on a map, or a branch?
2797: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2798: # And the count of how deep it is, so that this iterator can keep track of
2799: # when to pick back up again.
2800: $self->{RECURSIVE_DEPTH} = 0;
2801:
2802: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 2803: $self->{STACK} = [];
1.51 bowersj2 2804:
2805: # Start with the first resource
1.89 bowersj2 2806: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 2807: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 2808: } else {
1.100 bowersj2 2809: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 2810: }
1.51 bowersj2 2811:
2812: bless($self);
2813: return $self;
2814: }
2815:
2816: sub next {
2817: my $self = shift;
2818:
2819: # Are we using a recursive iterator? If so, pull from that and
2820: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 2821: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 2822: # grab the next from the recursive iterator
2823: my $next = $self->{RECURSIVE_ITERATOR}->next();
2824:
2825: # is it a begin or end map? Update depth if so
2826: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2827: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2828:
2829: # Are we back at depth 0? If so, stop recursing.
2830: if ($self->{RECURSIVE_DEPTH} == 0) {
2831: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2832: }
2833:
2834: return $next;
2835: }
2836:
2837: # Is there a current resource to grab? If not, then return
1.100 bowersj2 2838: # END_MAP, which will end the iterator.
2839: if (scalar(@{$self->{STACK}}) == 0) {
2840: return $self->END_MAP();
1.51 bowersj2 2841: }
2842:
2843: # Have we not yet begun? If not, return BEGIN_MAP and
2844: # remember that we've started.
2845: if ( !$self->{STARTED} ) {
2846: $self->{STARTED} = 1;
2847: return $self->BEGIN_MAP;
2848: }
2849:
2850: # Get the next resource in the branch
1.100 bowersj2 2851: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 2852:
1.100 bowersj2 2853: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 2854: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2855:
2856: # Get the next possible resources
1.90 bowersj2 2857: my $nextUnfiltered;
1.89 bowersj2 2858: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 2859: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 2860: } else {
1.90 bowersj2 2861: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 2862: }
1.51 bowersj2 2863: my $next = [];
2864:
2865: # filter the next possibilities to remove things we've
1.100 bowersj2 2866: # already seen.
1.51 bowersj2 2867: foreach (@$nextUnfiltered) {
1.52 bowersj2 2868: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2869: push @$next, $_;
2870: }
1.51 bowersj2 2871: }
2872:
2873: while (@$next) {
1.100 bowersj2 2874: # copy the next possibilities over to the stack
2875: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 2876: }
2877:
2878: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 2879: if ($self->{HERE}->is_map() &&
1.63 bowersj2 2880: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 2881: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2882: my $firstResource = $self->{HERE}->map_start();
2883: my $finishResource = $self->{HERE}->map_finish();
2884:
2885: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 2886: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 2887: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 2888: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 2889: }
2890:
2891: return $self->{HERE};
1.190 bowersj2 2892: }
2893:
2894: # Identical to the full iterator methods of the same name. Hate to copy/paste
2895: # but I also hate to "inherit" either iterator from the other.
2896:
2897: sub getStack {
2898: my $self=shift;
2899:
2900: my @stack;
2901:
2902: $self->populateStack(\@stack);
2903:
2904: return \@stack;
2905: }
2906:
2907: # Private method: Calls the iterators recursively to populate the stack.
2908: sub populateStack {
2909: my $self=shift;
2910: my $stack = shift;
2911:
2912: push @$stack, $self->{HERE} if ($self->{HERE});
2913:
2914: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2915: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2916: }
1.51 bowersj2 2917: }
2918:
1.1 www 2919: 1;
1.2 www 2920:
1.51 bowersj2 2921: package Apache::lonnavmaps::resource;
2922:
2923: use Apache::lonnet;
2924:
2925: =pod
2926:
1.217 bowersj2 2927: =head1 Object: resource
1.51 bowersj2 2928:
1.217 bowersj2 2929: X<resource, navmap object>
1.174 albertel 2930: A resource object encapsulates a resource in a resource map, allowing
2931: easy manipulation of the resource, querying the properties of the
2932: resource (including user properties), and represents a reference that
2933: can be used as the canonical representation of the resource by
2934: lonnavmap clients like renderers.
2935:
2936: A resource only makes sense in the context of a navmap, as some of the
2937: data is stored in the navmap object.
2938:
2939: You will probably never need to instantiate this object directly. Use
2940: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2941: starting resource.
1.51 bowersj2 2942:
1.188 bowersj2 2943: Resource objects respect the parameter_hiddenparts, which suppresses
2944: various parts according to the wishes of the map author. As of this
2945: writing, there is no way to override this parameter, and suppressed
2946: parts will never be returned, nor will their response types or ids be
2947: stored.
2948:
1.217 bowersj2 2949: =head2 Overview
1.51 bowersj2 2950:
1.217 bowersj2 2951: A B<Resource> is the most granular type of object in LON-CAPA that can
2952: be included in a course. It can either be a particular resource, like
2953: an HTML page, external resource, problem, etc., or it can be a
2954: container sequence, such as a "page" or a "map".
2955:
2956: To see a sequence from the user's point of view, please see the
2957: B<Creating a Course: Maps and Sequences> chapter of the Author's
2958: Manual.
2959:
2960: A Resource Object, once obtained from a navmap object via a B<getBy*>
2961: method of the navmap, or from an iterator, allows you to query
2962: information about that resource.
2963:
2964: Generally, you do not ever want to create a resource object yourself,
2965: so creation has been left undocumented. Always retrieve resources
2966: from navmap objects.
2967:
2968: =head3 Identifying Resources
2969:
2970: X<big hash>Every resource is identified by a Resource ID in the big hash that is
2971: unique to that resource for a given course. X<resource ID, in big hash>
2972: The Resource ID has the form #.#, where the first number is the same
2973: for every resource in a map, and the second is unique. For instance,
2974: for a course laid out like this:
2975:
2976: * Problem 1
2977: * Map
2978: * Resource 2
2979: * Resource 3
2980:
2981: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
2982: C<Resource 3> will share a first number. The second number may end up
2983: re-used between the two groups.
2984:
2985: The resource ID is only used in the big hash, but can be used in the
2986: context of a course to identify a resource easily. (For instance, the
2987: printing system uses it to record which resources from a sequence you
2988: wish to print.)
2989:
2990: X<symb> X<resource, symb>
2991: All resources also have B<symb>s, which uniquely identify a resource
2992: in a course. Many internal LON-CAPA functions expect a symb. A symb
2993: carries along with it the URL of the resource, and the map it appears
2994: in. Symbs are much larger then resource IDs.
1.51 bowersj2 2995:
2996: =cut
2997:
2998: sub new {
2999: # magic invocation to create a class instance
3000: my $proto = shift;
3001: my $class = ref($proto) || $proto;
3002: my $self = {};
3003:
3004: $self->{NAV_MAP} = shift;
3005: $self->{ID} = shift;
3006:
3007: # Store this new resource in the parent nav map's cache.
3008: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 3009: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 3010:
3011: # A hash that can be used by two-pass algorithms to store data
3012: # about this resource in. Not used by the resource object
3013: # directly.
3014: $self->{DATA} = {};
3015:
3016: bless($self);
3017:
3018: return $self;
3019: }
3020:
1.70 bowersj2 3021: # private function: simplify the NAV_HASH lookups we keep doing
3022: # pass the name, and to automatically append my ID, pass a true val on the
3023: # second param
3024: sub navHash {
3025: my $self = shift;
3026: my $param = shift;
3027: my $id = shift;
1.115 bowersj2 3028: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 3029: }
3030:
1.51 bowersj2 3031: =pod
3032:
1.217 bowersj2 3033: =head2 Methods
1.70 bowersj2 3034:
1.217 bowersj2 3035: Once you have a resource object, here's what you can do with it:
3036:
3037: =head3 Attribute Retrieval
3038:
3039: Every resource has certain attributes that can be retrieved and used:
1.70 bowersj2 3040:
3041: =over 4
3042:
1.217 bowersj2 3043: =item * B<ID>: Every resource has an ID that is unique for that
3044: resource in the course it is in. The ID is actually in the hash
3045: representing the resource, so for a resource object $res, obtain
3046: it via C<$res->{ID}).
3047:
1.174 albertel 3048: =item * B<compTitle>:
3049:
3050: Returns a "composite title", that is equal to $res->title() if the
3051: resource has a title, and is otherwise the last part of the URL (e.g.,
3052: "problem.problem").
3053:
3054: =item * B<ext>:
3055:
3056: Returns true if the resource is external.
3057:
3058: =item * B<kind>:
3059:
3060: Returns the kind of the resource from the compiled nav map.
3061:
3062: =item * B<randomout>:
1.106 bowersj2 3063:
1.174 albertel 3064: Returns true if this resource was chosen to NOT be shown to the user
3065: by the random map selection feature. In other words, this is usually
3066: false.
1.70 bowersj2 3067:
1.174 albertel 3068: =item * B<randompick>:
1.70 bowersj2 3069:
1.174 albertel 3070: Returns true for a map if the randompick feature is being used on the
3071: map. (?)
1.70 bowersj2 3072:
1.174 albertel 3073: =item * B<src>:
1.51 bowersj2 3074:
1.174 albertel 3075: Returns the source for the resource.
1.70 bowersj2 3076:
1.174 albertel 3077: =item * B<symb>:
1.70 bowersj2 3078:
1.174 albertel 3079: Returns the symb for the resource.
1.70 bowersj2 3080:
1.174 albertel 3081: =item * B<title>:
1.70 bowersj2 3082:
1.174 albertel 3083: Returns the title of the resource.
3084:
1.51 bowersj2 3085: =back
3086:
3087: =cut
3088:
3089: # These info functions can be used directly, as they don't return
3090: # resource information.
1.85 bowersj2 3091: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 3092: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 3093: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.217 bowersj2 3094: # considered private and undocumented
1.51 bowersj2 3095: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3096: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 3097: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3098: sub randompick {
3099: my $self = shift;
3100: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3101: '.0.parameter_randompick'};
3102: }
1.51 bowersj2 3103: sub src {
3104: my $self=shift;
3105: return $self->navHash("src_", 1);
3106: }
3107: sub symb {
3108: my $self=shift;
3109: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3110: my $symbSrc = &Apache::lonnet::declutter($self->src());
1.223 albertel 3111: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
1.51 bowersj2 3112: . '___' . $second . '___' . $symbSrc;
1.223 albertel 3113: return &Apache::lonnet::symbclean($symb);
1.51 bowersj2 3114: }
1.213 bowersj2 3115: sub title {
3116: my $self=shift;
3117: if ($self->{ID} eq '0.0') {
3118: # If this is the top-level map, return the title of the course
3119: # since this map can not be titled otherwise.
3120: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3121: }
3122: return $self->navHash("title_", 1); }
1.217 bowersj2 3123: # considered private and undocumented
1.70 bowersj2 3124: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 3125: sub compTitle {
3126: my $self = shift;
3127: my $title = $self->title();
1.176 www 3128: $title=~s/\&colon\;/\:/gs;
1.106 bowersj2 3129: if (!$title) {
3130: $title = $self->src();
3131: $title = substr($title, rindex($title, '/') + 1);
3132: }
3133: return $title;
3134: }
1.70 bowersj2 3135: =pod
3136:
3137: B<Predicate Testing the Resource>
3138:
3139: These methods are shortcuts to deciding if a given resource has a given property.
3140:
3141: =over 4
3142:
1.174 albertel 3143: =item * B<is_map>:
3144:
3145: Returns true if the resource is a map type.
3146:
3147: =item * B<is_problem>:
1.70 bowersj2 3148:
1.174 albertel 3149: Returns true if the resource is a problem type, false
3150: otherwise. (Looks at the extension on the src field; might need more
3151: to work correctly.)
1.70 bowersj2 3152:
1.174 albertel 3153: =item * B<is_page>:
1.70 bowersj2 3154:
1.174 albertel 3155: Returns true if the resource is a page.
3156:
3157: =item * B<is_sequence>:
3158:
3159: Returns true if the resource is a sequence.
1.70 bowersj2 3160:
3161: =back
3162:
3163: =cut
3164:
3165:
3166: sub is_html {
1.51 bowersj2 3167: my $self=shift;
3168: my $src = $self->src();
1.70 bowersj2 3169: return ($src =~ /html$/);
1.51 bowersj2 3170: }
1.70 bowersj2 3171: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3172: sub is_page {
1.51 bowersj2 3173: my $self=shift;
3174: my $src = $self->src();
1.205 bowersj2 3175: return $self->navHash("is_map_", 1) &&
3176: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
1.51 bowersj2 3177: }
1.70 bowersj2 3178: sub is_problem {
1.51 bowersj2 3179: my $self=shift;
3180: my $src = $self->src();
1.250 albertel 3181: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/);
1.51 bowersj2 3182: }
1.70 bowersj2 3183: sub is_sequence {
1.51 bowersj2 3184: my $self=shift;
3185: my $src = $self->src();
1.205 bowersj2 3186: return $self->navHash("is_map_", 1) &&
3187: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
1.51 bowersj2 3188: }
3189:
1.101 bowersj2 3190: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 3191: sub parmval {
3192: my $self = shift;
3193: my $what = shift;
1.185 bowersj2 3194: my $part = shift;
3195: if (!defined($part)) {
3196: $part = '0';
3197: }
1.51 bowersj2 3198: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3199: }
3200:
1.70 bowersj2 3201: =pod
3202:
3203: B<Map Methods>
3204:
1.174 albertel 3205: These methods are useful for getting information about the map
3206: properties of the resource, if the resource is a map (B<is_map>).
1.70 bowersj2 3207:
3208: =over 4
3209:
1.174 albertel 3210: =item * B<map_finish>:
3211:
3212: Returns a reference to a resource object corresponding to the finish
3213: resource of the map.
1.70 bowersj2 3214:
1.174 albertel 3215: =item * B<map_pc>:
1.70 bowersj2 3216:
1.174 albertel 3217: Returns the pc value of the map, which is the first number that
3218: appears in the resource ID of the resources in the map, and is the
3219: number that appears around the middle of the symbs of the resources in
3220: that map.
1.70 bowersj2 3221:
1.174 albertel 3222: =item * B<map_start>:
3223:
3224: Returns a reference to a resource object corresponding to the start
3225: resource of the map.
3226:
3227: =item * B<map_type>:
3228:
3229: Returns a string with the type of the map in it.
1.70 bowersj2 3230:
3231: =back
1.51 bowersj2 3232:
1.70 bowersj2 3233: =cut
1.51 bowersj2 3234:
3235: sub map_finish {
3236: my $self = shift;
3237: my $src = $self->src();
1.144 bowersj2 3238: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 3239: my $res = $self->navHash("map_finish_$src", 0);
3240: $res = $self->{NAV_MAP}->getById($res);
3241: return $res;
3242: }
1.70 bowersj2 3243: sub map_pc {
3244: my $self = shift;
3245: my $src = $self->src();
3246: return $self->navHash("map_pc_$src", 0);
3247: }
1.51 bowersj2 3248: sub map_start {
3249: my $self = shift;
3250: my $src = $self->src();
1.144 bowersj2 3251: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 3252: my $res = $self->navHash("map_start_$src", 0);
3253: $res = $self->{NAV_MAP}->getById($res);
3254: return $res;
3255: }
3256: sub map_type {
3257: my $self = shift;
3258: my $pc = $self->map_pc();
3259: return $self->navHash("map_type_$pc", 0);
3260: }
3261:
3262: #####
3263: # Property queries
3264: #####
3265:
3266: # These functions will be responsible for returning the CORRECT
3267: # VALUE for the parameter, no matter what. So while they may look
3268: # like direct calls to parmval, they can be more then that.
3269: # So, for instance, the duedate function should use the "duedatetype"
3270: # information, rather then the resource object user.
3271:
3272: =pod
3273:
3274: =head2 Resource Parameters
3275:
1.174 albertel 3276: In order to use the resource parameters correctly, the nav map must
3277: have been instantiated with genCourseAndUserOptions set to true, so
3278: the courseopt and useropt is read correctly. Then, you can call these
3279: functions to get the relevant parameters for the resource. Each
3280: function defaults to part "0", but can be directed to another part by
3281: passing the part as the parameter.
3282:
3283: These methods are responsible for getting the parameter correct, not
3284: merely reflecting the contents of the GDBM hashes. As we move towards
3285: dates relative to other dates, these methods should be updated to
3286: reflect that. (Then, anybody using these methods will not have to update
3287: their code.)
3288:
3289: =over 4
3290:
3291: =item * B<acc>:
3292:
3293: Get the Client IP/Name Access Control information.
1.51 bowersj2 3294:
1.174 albertel 3295: =item * B<answerdate>:
1.51 bowersj2 3296:
1.174 albertel 3297: Get the answer-reveal date for the problem.
3298:
1.211 bowersj2 3299: =item * B<awarded>:
3300:
3301: Gets the awarded value for the problem part. Requires genUserData set to
3302: true when the navmap object was created.
3303:
1.174 albertel 3304: =item * B<duedate>:
3305:
3306: Get the due date for the problem.
3307:
3308: =item * B<tries>:
3309:
3310: Get the number of tries the student has used on the problem.
3311:
3312: =item * B<maxtries>:
3313:
3314: Get the number of max tries allowed.
3315:
3316: =item * B<opendate>:
1.51 bowersj2 3317:
1.174 albertel 3318: Get the open date for the problem.
1.51 bowersj2 3319:
1.174 albertel 3320: =item * B<sig>:
1.51 bowersj2 3321:
1.174 albertel 3322: Get the significant figures setting.
1.51 bowersj2 3323:
1.174 albertel 3324: =item * B<tol>:
1.51 bowersj2 3325:
1.174 albertel 3326: Get the tolerance for the problem.
1.51 bowersj2 3327:
1.174 albertel 3328: =item * B<tries>:
1.51 bowersj2 3329:
1.174 albertel 3330: Get the number of tries the user has already used on the problem.
1.51 bowersj2 3331:
1.174 albertel 3332: =item * B<type>:
1.51 bowersj2 3333:
1.174 albertel 3334: Get the question type for the problem.
1.70 bowersj2 3335:
1.174 albertel 3336: =item * B<weight>:
1.51 bowersj2 3337:
1.174 albertel 3338: Get the weight for the problem.
1.51 bowersj2 3339:
3340: =back
3341:
3342: =cut
3343:
3344: sub acc {
3345: (my $self, my $part) = @_;
3346: return $self->parmval("acc", $part);
3347: }
3348: sub answerdate {
3349: (my $self, my $part) = @_;
3350: # Handle intervals
3351: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3352: return $self->duedate($part) +
3353: $self->parmval("answerdate", $part);
3354: }
3355: return $self->parmval("answerdate", $part);
1.106 bowersj2 3356: }
1.211 bowersj2 3357: sub awarded {
3358: my $self = shift; my $part = shift;
1.221 bowersj2 3359: $self->{NAV_MAP}->get_user_data();
1.211 bowersj2 3360: if (!defined($part)) { $part = '0'; }
3361: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3362: }
1.51 bowersj2 3363: sub duedate {
3364: (my $self, my $part) = @_;
3365: return $self->parmval("duedate", $part);
3366: }
3367: sub maxtries {
3368: (my $self, my $part) = @_;
3369: return $self->parmval("maxtries", $part);
3370: }
3371: sub opendate {
3372: (my $self, my $part) = @_;
3373: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3374: return $self->duedate($part) -
3375: $self->parmval("opendate", $part);
3376: }
3377: return $self->parmval("opendate");
3378: }
1.185 bowersj2 3379: sub problemstatus {
3380: (my $self, my $part) = @_;
1.236 bowersj2 3381: return lc $self->parmval("problemstatus", $part);
1.185 bowersj2 3382: }
1.51 bowersj2 3383: sub sig {
3384: (my $self, my $part) = @_;
3385: return $self->parmval("sig", $part);
3386: }
3387: sub tol {
3388: (my $self, my $part) = @_;
3389: return $self->parmval("tol", $part);
3390: }
1.108 bowersj2 3391: sub tries {
3392: my $self = shift;
3393: my $tries = $self->queryRestoreHash('tries', shift);
3394: if (!defined($tries)) { return '0';}
1.51 bowersj2 3395: return $tries;
3396: }
1.70 bowersj2 3397: sub type {
3398: (my $self, my $part) = @_;
3399: return $self->parmval("type", $part);
3400: }
1.109 bowersj2 3401: sub weight {
3402: my $self = shift; my $part = shift;
1.211 bowersj2 3403: if (!defined($part)) { $part = '0'; }
3404: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3405: $self->symb(), $ENV{'user.domain'},
3406: $ENV{'user.name'},
3407: $ENV{'request.course.sec'});
3408:
1.70 bowersj2 3409: }
1.51 bowersj2 3410:
3411: # Multiple things need this
3412: sub getReturnHash {
3413: my $self = shift;
3414:
3415: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 3416: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 3417: $self->{RETURN_HASH} = \%tmpHash;
3418: }
3419: }
3420:
3421: ######
3422: # Status queries
3423: ######
3424:
3425: # These methods query the status of problems.
3426:
3427: # If we need to count parts, this function determines the number of
3428: # parts from the metadata. When called, it returns a reference to a list
3429: # of strings corresponding to the parts. (Thus, using it in a scalar context
3430: # tells you how many parts you have in the problem:
3431: # $partcount = scalar($resource->countParts());
3432: # Don't use $self->{PARTS} directly because you don't know if it's been
3433: # computed yet.
3434:
3435: =pod
3436:
3437: =head2 Resource misc
3438:
3439: Misc. functions for the resource.
3440:
3441: =over 4
3442:
1.174 albertel 3443: =item * B<hasDiscussion>:
1.59 bowersj2 3444:
1.174 albertel 3445: Returns a false value if there has been discussion since the user last
3446: logged in, true if there has. Always returns false if the discussion
3447: data was not extracted when the nav map was constructed.
3448:
3449: =item * B<getFeedback>:
3450:
3451: Gets the feedback for the resource and returns the raw feedback string
3452: for the resource, or the null string if there is no feedback or the
3453: email data was not extracted when the nav map was constructed. Usually
3454: used like this:
1.59 bowersj2 3455:
3456: for (split(/\,/, $res->getFeedback())) {
3457: my $link = &Apache::lonnet::escape($_);
3458: ...
3459:
3460: and use the link as appropriate.
3461:
3462: =cut
3463:
3464: sub hasDiscussion {
3465: my $self = shift;
3466: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3467: }
3468:
3469: sub getFeedback {
3470: my $self = shift;
1.124 bowersj2 3471: my $source = $self->src();
1.125 bowersj2 3472: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 3473: return $self->{NAV_MAP}->getFeedback($source);
3474: }
3475:
3476: sub getErrors {
3477: my $self = shift;
3478: my $source = $self->src();
3479: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3480: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 3481: }
3482:
3483: =pod
3484:
1.174 albertel 3485: =item * B<parts>():
1.51 bowersj2 3486:
1.174 albertel 3487: Returns a list reference containing sorted strings corresponding to
1.193 bowersj2 3488: each part of the problem. Single part problems have only a part '0'.
3489: Multipart problems do not return their part '0', since they typically
3490: do not really matter.
1.174 albertel 3491:
3492: =item * B<countParts>():
3493:
3494: Returns the number of parts of the problem a student can answer. Thus,
3495: for single part problems, returns 1. For multipart, it returns the
1.193 bowersj2 3496: number of parts in the problem, not including psuedo-part 0.
1.51 bowersj2 3497:
1.192 bowersj2 3498: =item * B<multipart>():
3499:
1.193 bowersj2 3500: Returns true if the problem is multipart, false otherwise. Use this instead
3501: of countParts if all you want is multipart/not multipart.
1.192 bowersj2 3502:
1.187 bowersj2 3503: =item * B<responseType>($part):
3504:
3505: Returns the response type of the part, without the word "response" on the
3506: end. Example return values: 'string', 'essay', 'numeric', etc.
3507:
1.193 bowersj2 3508: =item * B<responseIds>($part):
1.187 bowersj2 3509:
1.193 bowersj2 3510: Retreives the response IDs for the given part as an array reference containing
3511: strings naming the response IDs. This may be empty.
1.187 bowersj2 3512:
1.51 bowersj2 3513: =back
3514:
3515: =cut
3516:
3517: sub parts {
3518: my $self = shift;
3519:
1.192 bowersj2 3520: if ($self->ext) { return []; }
1.67 bowersj2 3521:
1.51 bowersj2 3522: $self->extractParts();
3523: return $self->{PARTS};
3524: }
3525:
3526: sub countParts {
3527: my $self = shift;
3528:
3529: my $parts = $self->parts();
1.191 bowersj2 3530:
3531: # If I left this here, then it's not necessary.
3532: #my $delta = 0;
3533: #for my $part (@$parts) {
3534: # if ($part eq '0') { $delta--; }
3535: #}
1.66 bowersj2 3536:
3537: if ($self->{RESOURCE_ERROR}) {
3538: return 0;
3539: }
3540:
1.191 bowersj2 3541: return scalar(@{$parts}); # + $delta;
1.192 bowersj2 3542: }
3543:
3544: sub multipart {
3545: my $self = shift;
3546: return $self->countParts() > 1;
1.51 bowersj2 3547: }
3548:
1.225 bowersj2 3549: sub singlepart {
3550: my $self = shift;
3551: return $self->countParts() == 1;
3552: }
3553:
1.187 bowersj2 3554: sub responseType {
1.184 bowersj2 3555: my $self = shift;
3556: my $part = shift;
3557:
3558: $self->extractParts();
1.235 albertel 3559: if (defined($self->{RESPONSE_TYPES}->{$part})) {
3560: return @{$self->{RESPONSE_TYPES}->{$part}};
3561: } else {
3562: return undef;
3563: }
1.187 bowersj2 3564: }
3565:
1.193 bowersj2 3566: sub responseIds {
1.187 bowersj2 3567: my $self = shift;
3568: my $part = shift;
3569:
3570: $self->extractParts();
1.235 albertel 3571: if (defined($self->{RESPONSE_IDS}->{$part})) {
3572: return @{$self->{RESPONSE_IDS}->{$part}};
3573: } else {
3574: return undef;
3575: }
1.184 bowersj2 3576: }
3577:
3578: # Private function: Extracts the parts information, both part names and
1.187 bowersj2 3579: # part types, and saves it.
1.51 bowersj2 3580: sub extractParts {
3581: my $self = shift;
3582:
1.153 bowersj2 3583: return if (defined($self->{PARTS}));
1.67 bowersj2 3584: return if ($self->ext);
1.51 bowersj2 3585:
3586: $self->{PARTS} = [];
3587:
1.181 bowersj2 3588: my %parts;
3589:
1.82 bowersj2 3590: # Retrieve part count, if this is a problem
3591: if ($self->is_problem()) {
1.240 albertel 3592: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
1.152 matthew 3593: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.181 bowersj2 3594:
1.239 bowersj2 3595: if ($partorder) {
3596: my @parts;
3597: for my $part (split (/,/,$partorder)) {
3598: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3599: push @parts, $part;
1.241 albertel 3600: $parts{$part} = 1;
1.239 bowersj2 3601: }
3602: }
3603: $self->{PARTS} = \@parts;
3604: } else {
3605: if (!$metadata) {
3606: $self->{RESOURCE_ERROR} = 1;
3607: $self->{PARTS} = [];
3608: $self->{PART_TYPE} = {};
3609: return;
3610: }
3611: foreach (split(/\,/,$metadata)) {
3612: if ($_ =~ /^part_(.*)$/) {
3613: my $part = $1;
3614: # This floods the logs if it blows up
3615: if (defined($parts{$part})) {
1.241 albertel 3616: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3617: }
1.239 bowersj2 3618:
3619: # check to see if part is turned off.
3620:
3621: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3622: $parts{$part} = 1;
3623: }
3624: }
3625: }
3626: my @sortedParts = sort keys %parts;
3627: $self->{PARTS} = \@sortedParts;
1.51 bowersj2 3628: }
1.82 bowersj2 3629:
1.187 bowersj2 3630:
3631: my %responseIdHash;
3632: my %responseTypeHash;
3633:
1.189 bowersj2 3634:
3635: # Init the responseIdHash
3636: foreach (@{$self->{PARTS}}) {
3637: $responseIdHash{$_} = [];
3638: }
3639:
1.187 bowersj2 3640: # Now, the unfortunate thing about this is that parts, part name, and
1.239 bowersj2 3641: # response id are delimited by underscores, but both the part
1.187 bowersj2 3642: # name and response id can themselves have underscores in them.
3643: # So we have to use our knowlege of part names to figure out
3644: # where the part names begin and end, and even then, it is possible
3645: # to construct ambiguous situations.
3646: foreach (split /,/, $metadata) {
3647: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3648: my $responseType = $1;
3649: my $partStuff = $2;
3650: my $partIdSoFar = '';
3651: my @partChunks = split /_/, $partStuff;
3652: my $i = 0;
3653: for ($i = 0; $i < scalar(@partChunks); $i++) {
3654: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3655: $partIdSoFar .= $partChunks[$i];
3656: if ($parts{$partIdSoFar}) {
3657: my @otherChunks = @partChunks[$i+1..$#partChunks];
3658: my $responseId = join('_', @otherChunks);
1.188 bowersj2 3659: push @{$responseIdHash{$partIdSoFar}}, $responseId;
1.233 matthew 3660: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
1.187 bowersj2 3661: }
3662: }
3663: }
3664: }
3665: $self->{RESPONSE_IDS} = \%responseIdHash;
3666: $self->{RESPONSE_TYPES} = \%responseTypeHash;
1.154 bowersj2 3667: }
3668:
1.51 bowersj2 3669: return;
3670: }
3671:
3672: =pod
3673:
3674: =head2 Resource Status
3675:
1.174 albertel 3676: Problem resources have status information, reflecting their various
3677: dates and completion statuses.
1.51 bowersj2 3678:
1.174 albertel 3679: There are two aspects to the status: the date-related information and
3680: the completion information.
1.51 bowersj2 3681:
1.174 albertel 3682: Idiomatic usage of these two methods would probably look something
3683: like
1.51 bowersj2 3684:
3685: foreach ($resource->parts()) {
3686: my $dateStatus = $resource->getDateStatus($_);
3687: my $completionStatus = $resource->getCompletionStatus($_);
3688:
1.70 bowersj2 3689: or
3690:
3691: my $status = $resource->status($_);
3692:
1.51 bowersj2 3693: ... use it here ...
3694: }
3695:
1.174 albertel 3696: Which you use depends on exactly what you are looking for. The
3697: status() function has been optimized for the nav maps display and may
3698: not precisely match what you need elsewhere.
1.101 bowersj2 3699:
1.174 albertel 3700: The symbolic constants shown below can be accessed through the
3701: resource object: C<$res->OPEN>.
1.101 bowersj2 3702:
1.51 bowersj2 3703: =over 4
3704:
1.174 albertel 3705: =item * B<getDateStatus>($part):
3706:
3707: ($part defaults to 0). A convenience function that returns a symbolic
3708: constant telling you about the date status of the part. The possible
3709: return values are:
1.51 bowersj2 3710:
3711: =back
3712:
3713: B<Date Codes>
3714:
3715: =over 4
3716:
1.174 albertel 3717: =item * B<OPEN_LATER>:
3718:
3719: The problem will be opened later.
3720:
3721: =item * B<OPEN>:
3722:
3723: Open and not yet due.
3724:
1.51 bowersj2 3725:
1.174 albertel 3726: =item * B<PAST_DUE_ANSWER_LATER>:
1.51 bowersj2 3727:
1.174 albertel 3728: The due date has passed, but the answer date has not yet arrived.
1.59 bowersj2 3729:
1.174 albertel 3730: =item * B<PAST_DUE_NO_ANSWER>:
1.54 bowersj2 3731:
1.174 albertel 3732: The due date has passed and there is no answer opening date set.
1.51 bowersj2 3733:
1.174 albertel 3734: =item * B<ANSWER_OPEN>:
1.51 bowersj2 3735:
1.174 albertel 3736: The answer date is here.
3737:
3738: =item * B<NETWORK_FAILURE>:
3739:
3740: The information is unknown due to network failure.
1.51 bowersj2 3741:
3742: =back
3743:
3744: =cut
3745:
3746: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 3747: sub OPEN_LATER { return 0; }
3748: sub OPEN { return 1; }
3749: sub PAST_DUE_NO_ANSWER { return 2; }
3750: sub PAST_DUE_ANSWER_LATER { return 3; }
3751: sub ANSWER_OPEN { return 4; }
3752: sub NOTHING_SET { return 5; }
3753: sub NETWORK_FAILURE { return 100; }
3754:
3755: # getDateStatus gets the date status for a given problem part.
3756: # Because answer date, due date, and open date are fully independent
3757: # (i.e., it is perfectly possible to *only* have an answer date),
3758: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3759: # (past, future, none given). This function handles this with a decision
3760: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 3761:
3762: sub getDateStatus {
3763: my $self = shift;
3764: my $part = shift;
3765: $part = "0" if (!defined($part));
1.54 bowersj2 3766:
3767: # Always return network failure if there was one.
1.51 bowersj2 3768: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3769:
3770: my $now = time();
3771:
1.53 bowersj2 3772: my $open = $self->opendate($part);
3773: my $due = $self->duedate($part);
3774: my $answer = $self->answerdate($part);
3775:
3776: if (!$open && !$due && !$answer) {
3777: # no data on the problem at all
3778: # should this be the same as "open later"? think multipart.
3779: return $self->NOTHING_SET;
3780: }
1.59 bowersj2 3781: if (!$open || $now < $open) {return $self->OPEN_LATER}
3782: if (!$due || $now < $due) {return $self->OPEN}
3783: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3784: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 3785: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 3786: }
3787:
3788: =pod
3789:
3790: B<>
3791:
3792: =over 4
3793:
1.174 albertel 3794: =item * B<getCompletionStatus>($part):
1.51 bowersj2 3795:
1.174 albertel 3796: ($part defaults to 0.) A convenience function that returns a symbolic
3797: constant telling you about the completion status of the part, with the
3798: following possible results:
3799:
3800: =back
1.51 bowersj2 3801:
3802: B<Completion Codes>
3803:
3804: =over 4
3805:
1.174 albertel 3806: =item * B<NOT_ATTEMPTED>:
3807:
3808: Has not been attempted at all.
3809:
3810: =item * B<INCORRECT>:
3811:
3812: Attempted, but wrong by student.
1.51 bowersj2 3813:
1.174 albertel 3814: =item * B<INCORRECT_BY_OVERRIDE>:
1.51 bowersj2 3815:
1.174 albertel 3816: Attempted, but wrong by instructor override.
1.51 bowersj2 3817:
1.174 albertel 3818: =item * B<CORRECT>:
1.51 bowersj2 3819:
1.174 albertel 3820: Correct or correct by instructor.
1.51 bowersj2 3821:
1.174 albertel 3822: =item * B<CORRECT_BY_OVERRIDE>:
1.51 bowersj2 3823:
1.174 albertel 3824: Correct by instructor override.
1.51 bowersj2 3825:
1.174 albertel 3826: =item * B<EXCUSED>:
3827:
3828: Excused. Not yet implemented.
3829:
3830: =item * B<NETWORK_FAILURE>:
3831:
3832: Information not available due to network failure.
3833:
3834: =item * B<ATTEMPTED>:
3835:
3836: Attempted, and not yet graded.
1.69 bowersj2 3837:
1.51 bowersj2 3838: =back
3839:
3840: =cut
3841:
1.53 bowersj2 3842: sub NOT_ATTEMPTED { return 10; }
3843: sub INCORRECT { return 11; }
3844: sub INCORRECT_BY_OVERRIDE { return 12; }
3845: sub CORRECT { return 13; }
3846: sub CORRECT_BY_OVERRIDE { return 14; }
3847: sub EXCUSED { return 15; }
1.69 bowersj2 3848: sub ATTEMPTED { return 16; }
1.51 bowersj2 3849:
3850: sub getCompletionStatus {
3851: my $self = shift;
3852: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3853:
1.108 bowersj2 3854: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 3855:
1.251 www 3856: # Left as separate if statements in case we ever do more with this
1.51 bowersj2 3857: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3858: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3859: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3860: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3861: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 3862: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 3863: return $self->NOT_ATTEMPTED;
1.108 bowersj2 3864: }
3865:
3866: sub queryRestoreHash {
3867: my $self = shift;
3868: my $hashentry = shift;
3869: my $part = shift;
1.185 bowersj2 3870: $part = "0" if (!defined($part) || $part eq '');
1.108 bowersj2 3871: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3872:
3873: $self->getReturnHash();
3874:
3875: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 3876: }
3877:
3878: =pod
3879:
3880: B<Composite Status>
3881:
1.174 albertel 3882: Along with directly returning the date or completion status, the
3883: resource object includes a convenience function B<status>() that will
3884: combine the two status tidbits into one composite status that can
1.191 bowersj2 3885: represent the status of the resource as a whole. This method represents
3886: the concept of the thing we want to display to the user on the nav maps
3887: screen, which is a combination of completion and open status. The precise logic is
1.174 albertel 3888: documented in the comments of the status method. The following results
3889: may be returned, all available as methods on the resource object
1.185 bowersj2 3890: ($res->NETWORK_FAILURE): In addition to the return values that match
3891: the date or completion status, this function can return "ANSWER_SUBMITTED"
3892: if that problemstatus parameter value is set to No, suppressing the
3893: incorrect/correct feedback.
1.51 bowersj2 3894:
3895: =over 4
3896:
1.174 albertel 3897: =item * B<NETWORK_FAILURE>:
3898:
3899: The network has failed and the information is not available.
1.51 bowersj2 3900:
1.174 albertel 3901: =item * B<NOTHING_SET>:
1.53 bowersj2 3902:
1.174 albertel 3903: No dates have been set for this problem (part) at all. (Because only
3904: certain parts of a multi-part problem may be assigned, this can not be
3905: collapsed into "open later", as we do not know a given part will EVER
3906: be opened. For single part, this is the same as "OPEN_LATER".)
1.51 bowersj2 3907:
1.174 albertel 3908: =item * B<CORRECT>:
1.51 bowersj2 3909:
1.174 albertel 3910: For any reason at all, the part is considered correct.
1.54 bowersj2 3911:
1.174 albertel 3912: =item * B<EXCUSED>:
1.51 bowersj2 3913:
1.174 albertel 3914: For any reason at all, the problem is excused.
1.51 bowersj2 3915:
1.174 albertel 3916: =item * B<PAST_DUE_NO_ANSWER>:
1.51 bowersj2 3917:
1.174 albertel 3918: The problem is past due, not considered correct, and no answer date is
3919: set.
1.51 bowersj2 3920:
1.174 albertel 3921: =item * B<PAST_DUE_ANSWER_LATER>:
1.51 bowersj2 3922:
1.174 albertel 3923: The problem is past due, not considered correct, and an answer date in
3924: the future is set.
1.51 bowersj2 3925:
1.174 albertel 3926: =item * B<ANSWER_OPEN>:
3927:
3928: The problem is past due, not correct, and the answer is now available.
3929:
3930: =item * B<OPEN_LATER>:
3931:
3932: The problem is not yet open.
3933:
3934: =item * B<TRIES_LEFT>:
3935:
3936: The problem is open, has been tried, is not correct, but there are
3937: tries left.
3938:
3939: =item * B<INCORRECT>:
3940:
3941: The problem is open, and all tries have been used without getting the
3942: correct answer.
3943:
3944: =item * B<OPEN>:
3945:
3946: The item is open and not yet tried.
3947:
3948: =item * B<ATTEMPTED>:
3949:
3950: The problem has been attempted.
1.69 bowersj2 3951:
1.185 bowersj2 3952: =item * B<ANSWER_SUBMITTED>:
3953:
3954: An answer has been submitted, but the student should not see it.
3955:
1.51 bowersj2 3956: =back
3957:
3958: =cut
3959:
1.185 bowersj2 3960: sub TRIES_LEFT { return 20; }
3961: sub ANSWER_SUBMITTED { return 21; }
1.51 bowersj2 3962:
3963: sub status {
3964: my $self = shift;
3965: my $part = shift;
3966: if (!defined($part)) { $part = "0"; }
3967: my $completionStatus = $self->getCompletionStatus($part);
3968: my $dateStatus = $self->getDateStatus($part);
3969:
3970: # What we have is a two-dimensional matrix with 4 entries on one
3971: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 3972: # plus network failure and "no date data at all".
1.51 bowersj2 3973:
1.222 bowersj2 3974: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
1.53 bowersj2 3975: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 3976:
1.236 bowersj2 3977: my $suppressFeedback = $self->problemstatus($part) eq 'no';
3978: # If there's an answer date and we're past it, don't
3979: # suppress the feedback; student should know
3980: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
3981: $suppressFeedback = 0;
3982: }
1.185 bowersj2 3983:
1.51 bowersj2 3984: # There are a few whole rows we can dispose of:
1.53 bowersj2 3985: if ($completionStatus == CORRECT ||
3986: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.185 bowersj2 3987: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
1.69 bowersj2 3988: }
3989:
3990: if ($completionStatus == ATTEMPTED) {
3991: return ATTEMPTED;
1.53 bowersj2 3992: }
3993:
3994: # If it's EXCUSED, then return that no matter what
3995: if ($completionStatus == EXCUSED) {
3996: return EXCUSED;
1.51 bowersj2 3997: }
3998:
1.53 bowersj2 3999: if ($dateStatus == NOTHING_SET) {
4000: return NOTHING_SET;
1.51 bowersj2 4001: }
4002:
1.69 bowersj2 4003: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4004: # by 4 matrix (date statuses).
1.51 bowersj2 4005:
1.54 bowersj2 4006: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 4007: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 4008: return $dateStatus;
1.51 bowersj2 4009: }
4010:
1.53 bowersj2 4011: if ($dateStatus == ANSWER_OPEN) {
4012: return ANSWER_OPEN;
1.51 bowersj2 4013: }
4014:
4015: # Now: (incorrect, incorrect_override, not_attempted) x
4016: # (open_later), (open)
4017:
1.53 bowersj2 4018: if ($dateStatus == OPEN_LATER) {
4019: return OPEN_LATER;
1.51 bowersj2 4020: }
4021:
4022: # If it's WRONG...
1.53 bowersj2 4023: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 4024: # and there are TRIES LEFT:
1.79 bowersj2 4025: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.222 bowersj2 4026: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
1.51 bowersj2 4027: }
1.185 bowersj2 4028: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 4029: }
4030:
4031: # Otherwise, it's untried and open
1.53 bowersj2 4032: return OPEN;
1.224 bowersj2 4033: }
4034:
4035: sub CLOSED { return 23; }
4036: sub ERROR { return 24; }
4037:
4038: =pod
4039:
4040: B<Simple Status>
4041:
4042: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4043: "Simple status" corresponds to "which icon is shown on the
4044: Navmaps". There are six "simple" statuses:
4045:
4046: =over 4
4047:
4048: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4049:
4050: =item * B<OPEN>: The problem is open and unattempted.
4051:
4052: =item * B<CORRECT>: The problem is correct for any reason.
4053:
4054: =item * B<INCORRECT>: The problem is incorrect and can still be
4055: completed successfully.
4056:
4057: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4058: does not know if they are correct. (The ellipsis icon.)
4059:
4060: =item * B<ERROR>: There is an error retrieving information about this
4061: problem.
4062:
4063: =back
4064:
4065: =cut
4066:
4067: # This hash maps the composite status to this simple status, and
4068: # can be used directly, if you like
4069: my %compositeToSimple =
4070: (
4071: NETWORK_FAILURE() => ERROR,
4072: NOTHING_SET() => CLOSED,
4073: CORRECT() => CORRECT,
4074: EXCUSED() => CORRECT,
4075: PAST_DUE_NO_ANSWER() => INCORRECT,
4076: PAST_DUE_ANSWER_LATER() => INCORRECT,
4077: ANSWER_OPEN() => INCORRECT,
4078: OPEN_LATER() => CLOSED,
4079: TRIES_LEFT() => OPEN,
4080: INCORRECT() => INCORRECT,
4081: OPEN() => OPEN,
4082: ATTEMPTED() => ATTEMPTED,
4083: ANSWER_SUBMITTED() => ATTEMPTED
4084: );
4085:
4086: sub simpleStatus {
4087: my $self = shift;
4088: my $part = shift;
4089: my $status = $self->status($part);
4090: return $compositeToSimple{$status};
1.225 bowersj2 4091: }
4092:
4093: =pod
4094:
4095: B<simpleStatusCount> will return an array reference containing, in
4096: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4097: and ERROR parts the given problem has.
4098:
4099: =cut
4100:
4101: # This maps the status to the slot we want to increment
4102: my %statusToSlotMap =
4103: (
4104: OPEN() => 0,
4105: CLOSED() => 1,
4106: CORRECT() => 2,
4107: INCORRECT() => 3,
4108: ATTEMPTED() => 4,
4109: ERROR() => 5
4110: );
4111:
4112: sub statusToSlot { return $statusToSlotMap{shift()}; }
4113:
4114: sub simpleStatusCount {
4115: my $self = shift;
4116:
4117: my @counts = (0, 0, 0, 0, 0, 0, 0);
4118: foreach my $part (@{$self->parts()}) {
4119: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4120: }
4121:
4122: return \@counts;
1.191 bowersj2 4123: }
4124:
4125: =pod
4126:
4127: B<Completable>
4128:
4129: The completable method represents the concept of I<whether the student can
4130: currently do the problem>. If the student can do the problem, which means
4131: that it is open, there are tries left, and if the problem is manually graded
4132: or the grade is suppressed via problemstatus, the student has not tried it
4133: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4134: either the student has tried it and there is no feedback, or that for
4135: some reason it is no longer completable (not open yet, successfully completed,
4136: out of tries, etc.). As an example, this is used as the filter for the
4137: "Uncompleted Homework" option for the nav maps.
4138:
4139: If this does not quite meet your needs, do not fiddle with it (unless you are
4140: fixing it to better match the student's conception of "completable" because
4141: it's broken somehow)... make a new method.
4142:
4143: =cut
4144:
4145: sub completable {
4146: my $self = shift;
4147: if (!$self->is_problem()) { return 0; }
4148: my $partCount = $self->countParts();
4149:
4150: foreach my $part (@{$self->parts()}) {
4151: if ($part eq '0' && $partCount != 1) { next; }
4152: my $status = $self->status($part);
4153: # "If any of the parts are open, or have tries left (implies open),
4154: # and it is not "attempted" (manually graded problem), it is
4155: # not "complete"
1.216 bowersj2 4156: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4157: $status == ANSWER_SUBMITTED() ) {
4158: # did this part already, as well as we can
4159: next;
4160: }
4161: if ($status == OPEN() || $status == TRIES_LEFT()) {
4162: return 1;
4163: }
1.191 bowersj2 4164: }
4165:
4166: # If all the parts were complete, so was this problem.
1.216 bowersj2 4167: return 0;
1.51 bowersj2 4168: }
4169:
4170: =pod
4171:
4172: =head2 Resource/Nav Map Navigation
4173:
4174: =over 4
4175:
1.174 albertel 4176: =item * B<getNext>():
4177:
4178: Retreive an array of the possible next resources after this
4179: one. Always returns an array, even in the one- or zero-element case.
4180:
4181: =item * B<getPrevious>():
1.85 bowersj2 4182:
1.174 albertel 4183: Retreive an array of the possible previous resources from this
4184: one. Always returns an array, even in the one- or zero-element case.
1.51 bowersj2 4185:
4186: =cut
4187:
4188: sub getNext {
4189: my $self = shift;
4190: my @branches;
4191: my $to = $self->to();
1.85 bowersj2 4192: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 4193: my $choice = $self->{NAV_MAP}->getById($branch);
4194: my $next = $choice->goesto();
4195: $next = $self->{NAV_MAP}->getById($next);
4196:
1.131 bowersj2 4197: push @branches, $next;
1.85 bowersj2 4198: }
4199: return \@branches;
4200: }
4201:
4202: sub getPrevious {
4203: my $self = shift;
4204: my @branches;
4205: my $from = $self->from();
4206: foreach my $branch ( split /,/, $from) {
4207: my $choice = $self->{NAV_MAP}->getById($branch);
4208: my $prev = $choice->comesfrom();
4209: $prev = $self->{NAV_MAP}->getById($prev);
4210:
1.131 bowersj2 4211: push @branches, $prev;
1.51 bowersj2 4212: }
4213: return \@branches;
1.131 bowersj2 4214: }
4215:
4216: sub browsePriv {
4217: my $self = shift;
4218: if (defined($self->{BROWSE_PRIV})) {
4219: return $self->{BROWSE_PRIV};
4220: }
4221:
4222: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 4223: }
4224:
4225: =pod
1.2 www 4226:
1.51 bowersj2 4227: =back
1.2 www 4228:
1.51 bowersj2 4229: =cut
1.2 www 4230:
1.51 bowersj2 4231: 1;
1.2 www 4232:
1.51 bowersj2 4233: __END__
1.2 www 4234:
4235:
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