Annotation of loncom/interface/lonnavmaps.pm, revision 1.267.2.7
1.2 www 1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
1.1 www 3: #
1.267.2.7! albertel 4: # $Id: lonnavmaps.pm,v 1.267.2.6 2004/09/20 15:28:10 albertel 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'}));
1.262 www 140: $r->print('<script>window.focus();</script>'.
1.265 albertel 141: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
142:
1.124 bowersj2 143: $r->rflush();
144:
1.55 bowersj2 145: # Check that it's defined
146: if (!($navmap->courseMapDefined())) {
147: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
148: '</body></html>');
149: return OK;
150: }
151:
1.178 bowersj2 152: # See if there's only one map in the top-level, if we don't
153: # already have a filter... if so, automatically display it
1.222 bowersj2 154: # (older code; should use retrieveResources)
1.179 bowersj2 155: if ($ENV{QUERY_STRING} !~ /filter/) {
1.178 bowersj2 156: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
1.222 bowersj2 157: my $curRes;
1.178 bowersj2 158: my $sequenceCount = 0;
159: my $sequenceId;
1.222 bowersj2 160: while ($curRes = $iterator->next()) {
1.178 bowersj2 161: if (ref($curRes) && $curRes->is_sequence()) {
162: $sequenceCount++;
163: $sequenceId = $curRes->map_pc();
1.179 bowersj2 164: }
1.178 bowersj2 165: }
166:
167: if ($sequenceCount == 1) {
168: # The automatic iterator creation in the render call
169: # will pick this up. We know the condition because
170: # the defined($ENV{'form.filter'}) also ensures this
171: # is a fresh call.
172: $ENV{'form.filter'} = "$sequenceId";
1.155 bowersj2 173: }
174: }
175:
1.191 bowersj2 176: my $jumpToFirstHomework = 0;
1.184 bowersj2 177: # Check to see if the student is jumping to next open, do-able problem
178: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
1.191 bowersj2 179: $jumpToFirstHomework = 1;
1.184 bowersj2 180: # Find the next homework problem that they can do.
181: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
1.222 bowersj2 182: my $curRes;
1.184 bowersj2 183: my $foundDoableProblem = 0;
184: my $problemRes;
185:
1.222 bowersj2 186: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
1.184 bowersj2 187: if (ref($curRes) && $curRes->is_problem()) {
188: my $status = $curRes->status();
1.191 bowersj2 189: if ($curRes->completable()) {
1.184 bowersj2 190: $problemRes = $curRes;
191: $foundDoableProblem = 1;
192:
193: # Pop open all previous maps
194: my $stack = $iterator->getStack();
195: pop @$stack; # last resource in the stack is the problem
196: # itself, which we don't need in the map stack
197: my @mapPcs = map {$_->map_pc()} @$stack;
198: $ENV{'form.filter'} = join(',', @mapPcs);
199:
200: # Mark as both "here" and "jump"
201: $ENV{'form.postsymb'} = $curRes->symb();
202: }
203: }
204: }
205:
206: # If we found no problems, print a note to that effect.
207: if (!$foundDoableProblem) {
208: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
209: }
210: } else {
211: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
1.229 www 212: &mt("Go To My First Homework Problem")."</a> ");
1.184 bowersj2 213: }
214:
1.191 bowersj2 215: my $suppressEmptySequences = 0;
216: my $filterFunc = undef;
1.201 bowersj2 217: my $resource_no_folder_link = 0;
218:
1.191 bowersj2 219: # Display only due homework.
220: my $showOnlyHomework = 0;
221: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
222: $showOnlyHomework = 1;
223: $suppressEmptySequences = 1;
224: $filterFunc = sub { my $res = shift;
1.201 bowersj2 225: return $res->completable() || $res->is_map();
1.191 bowersj2 226: };
1.229 www 227: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
1.191 bowersj2 228: $ENV{'form.filter'} = '';
229: $ENV{'form.condition'} = 1;
1.201 bowersj2 230: $resource_no_folder_link = 1;
1.191 bowersj2 231: } else {
232: $r->print("<a href='navmaps?showOnlyHomework'>" .
1.229 www 233: &mt("Show Only Uncompleted Homework")."</a> ");
1.191 bowersj2 234: }
235:
1.133 bowersj2 236: # renderer call
1.191 bowersj2 237: my $renderArgs = { 'cols' => [0,1,2,3],
238: 'url' => '/adm/navmaps',
239: 'navmap' => $navmap,
240: 'suppressNavmap' => 1,
241: 'suppressEmptySequences' => $suppressEmptySequences,
242: 'filterFunc' => $filterFunc,
1.201 bowersj2 243: 'resource_no_folder_link' => $resource_no_folder_link,
1.191 bowersj2 244: 'r' => $r};
245: my $render = render($renderArgs);
246: $navmap->untieHashes();
1.133 bowersj2 247:
1.191 bowersj2 248: # If no resources were printed, print a reassuring message so the
249: # user knows there was no error.
250: if ($renderArgs->{'counter'} == 0) {
251: if ($showOnlyHomework) {
1.229 www 252: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
1.191 bowersj2 253: } else { # both jumpToFirstHomework and normal use the same: course must be empty
254: $r->print("<p><font size='+1'>This course is empty.</font></p>");
255: }
256: }
1.51 bowersj2 257:
1.128 bowersj2 258: $r->print("</body></html>");
1.134 bowersj2 259: $r->rflush();
1.59 bowersj2 260:
1.51 bowersj2 261: return OK;
262: }
263:
264: # Convenience functions: Returns a string that adds or subtracts
265: # the second argument from the first hash, appropriate for the
266: # query string that determines which folders to recurse on
267: sub addToFilter {
268: my $hashIn = shift;
269: my $addition = shift;
270: my %hash = %$hashIn;
271: $hash{$addition} = 1;
272:
273: return join (",", keys(%hash));
274: }
275:
276: sub removeFromFilter {
277: my $hashIn = shift;
278: my $subtraction = shift;
279: my %hash = %$hashIn;
280:
281: delete $hash{$subtraction};
282: return join(",", keys(%hash));
283: }
284:
285: # Convenience function: Given a stack returned from getStack on the iterator,
286: # return the correct src() value.
287: # Later, this should add an anchor when we start putting anchors in pages.
288: sub getLinkForResource {
289: my $stack = shift;
290: my $res;
291:
292: # Check to see if there are any pages in the stack
293: foreach $res (@$stack) {
1.248 www 294: if (defined($res)) {
295: if ($res->is_page()) {
296: return $res->src();
297: }
298: # in case folder was skipped over as "only sequence"
299: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
300: if ($map=~/\.page$/) {
1.249 www 301: return &Apache::lonnet::clutter($map).'#'.
302: &Apache::lonnet::escape(&Apache::lonnet::declutter($src));
1.248 www 303: }
1.51 bowersj2 304: }
305: }
306:
307: # Failing that, return the src of the last resource that is defined
308: # (when we first recurse on a map, it puts an undefined resource
309: # on the bottom because $self->{HERE} isn't defined yet, and we
310: # want the src for the map anyhow)
311: foreach (@$stack) {
312: if (defined($_)) { $res = $_; }
313: }
314:
315: return $res->src();
316: }
317:
1.251 www 318: # Convenience function: This separates the logic of how to create
1.53 bowersj2 319: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
1.251 www 320: # etc.) into a separate function. It takes a resource object as the
1.53 bowersj2 321: # first parameter, and the part number of the resource as the second.
322: # It's basically a big switch statement on the status of the resource.
323:
324: sub getDescription {
325: my $res = shift;
326: my $part = shift;
1.69 bowersj2 327: my $status = $res->status($part);
1.53 bowersj2 328:
1.182 bowersj2 329: if ($status == $res->NETWORK_FAILURE) {
1.229 www 330: return &mt("Having technical difficulties; please check status later");
1.182 bowersj2 331: }
1.53 bowersj2 332: if ($status == $res->NOTHING_SET) {
1.229 www 333: return &mt("Not currently assigned.");
1.53 bowersj2 334: }
335: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 336: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 337: }
338: if ($status == $res->OPEN) {
1.79 bowersj2 339: if ($res->duedate($part)) {
1.229 www 340: return &mt("Due")." " .timeToHumanString($res->duedate($part));
1.66 bowersj2 341: } else {
1.229 www 342: return &mt("Open, no due date");
1.66 bowersj2 343: }
1.53 bowersj2 344: }
1.54 bowersj2 345: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.229 www 346: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 347: }
348: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.229 www 349: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
1.53 bowersj2 350: }
351: if ($status == $res->ANSWER_OPEN) {
1.229 www 352: return &mt("Answer available");
1.53 bowersj2 353: }
1.59 bowersj2 354: if ($status == $res->EXCUSED) {
1.229 www 355: return &mt("Excused by instructor");
1.59 bowersj2 356: }
1.69 bowersj2 357: if ($status == $res->ATTEMPTED) {
1.229 www 358: return &mt("Answer submitted, not yet graded");
1.69 bowersj2 359: }
1.59 bowersj2 360: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 361: my $tries = $res->tries($part);
362: my $maxtries = $res->maxtries($part);
363: my $triesString = "";
364: if ($tries && $maxtries) {
365: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
366: if ($maxtries > 1 && $maxtries - $tries == 1) {
367: $triesString = "<b>$triesString</b>";
368: }
369: }
1.244 albertel 370: if ($res->duedate($part)) {
1.229 www 371: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 372: " $triesString";
373: } else {
1.229 www 374: return &mt("No due date")." $triesString";
1.66 bowersj2 375: }
1.59 bowersj2 376: }
1.185 bowersj2 377: if ($status == $res->ANSWER_SUBMITTED) {
1.229 www 378: return &mt('Answer submitted');
1.185 bowersj2 379: }
1.53 bowersj2 380: }
381:
1.115 bowersj2 382: # Convenience function, so others can use it: Is the problem due in less then
383: # 24 hours, and still can be done?
384:
1.252 matthew 385: sub dueInLessThan24Hours {
1.115 bowersj2 386: my $res = shift;
387: my $part = shift;
388: my $status = $res->status($part);
389:
1.207 bowersj2 390: return ($status == $res->OPEN() ||
1.115 bowersj2 391: $status == $res->TRIES_LEFT()) &&
1.244 albertel 392: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
393: $res->duedate($part) > time();
1.115 bowersj2 394: }
395:
396: # Convenience function, so others can use it: Is there only one try remaining for the
397: # part, with more then one try to begin with, not due yet and still can be done?
398: sub lastTry {
399: my $res = shift;
400: my $part = shift;
401:
402: my $tries = $res->tries($part);
403: my $maxtries = $res->maxtries($part);
404: return $tries && $maxtries && $maxtries > 1 &&
1.244 albertel 405: $maxtries - $tries == 1 && $res->duedate($part) &&
406: $res->duedate($part) > time();
1.115 bowersj2 407: }
408:
1.101 bowersj2 409: # This puts a human-readable name on the ENV variable.
1.177 www 410:
1.68 bowersj2 411: sub advancedUser {
1.177 www 412: return $ENV{'request.role.adv'};
1.68 bowersj2 413: }
414:
1.73 bowersj2 415:
416: # timeToHumanString takes a time number and converts it to a
417: # human-readable representation, meant to be used in the following
418: # manner:
419: # print "Due $timestring"
420: # print "Open $timestring"
421: # print "Answer available $timestring"
422: # Very, very, very, VERY English-only... goodness help a localizer on
423: # this func...
1.53 bowersj2 424: sub timeToHumanString {
1.58 albertel 425: my ($time) = @_;
426: # zero, '0' and blank are bad times
1.73 bowersj2 427: if (!$time) {
1.229 www 428: return &mt('never');
1.73 bowersj2 429: }
1.231 www 430: unless (&Apache::lonlocal::current_language()=~/^en/) {
1.237 www 431: return &Apache::lonlocal::locallocaltime($time);
1.229 www 432: }
1.73 bowersj2 433: my $now = time();
434:
435: my @time = localtime($time);
436: my @now = localtime($now);
437:
438: # Positive = future
439: my $delta = $time - $now;
440:
441: my $minute = 60;
442: my $hour = 60 * $minute;
443: my $day = 24 * $hour;
444: my $week = 7 * $day;
445: my $inPast = 0;
446:
447: # Logic in comments:
448: # Is it now? (extremely unlikely)
449: if ( $delta == 0 ) {
450: return "this instant";
451: }
452:
453: if ($delta < 0) {
454: $inPast = 1;
455: $delta = -$delta;
456: }
457:
458: if ( $delta > 0 ) {
1.101 bowersj2 459:
1.73 bowersj2 460: my $tense = $inPast ? " ago" : "";
461: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 462:
463: # Less then a minute
1.73 bowersj2 464: if ( $delta < $minute ) {
465: if ($delta == 1) { return "${prefix}1 second$tense"; }
466: return "$prefix$delta seconds$tense";
467: }
468:
1.101 bowersj2 469: # Less then an hour
1.73 bowersj2 470: if ( $delta < $hour ) {
471: # If so, use minutes
472: my $minutes = floor($delta / 60);
473: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
474: return "$prefix$minutes minutes$tense";
475: }
476:
477: # Is it less then 24 hours away? If so,
478: # display hours + minutes
479: if ( $delta < $hour * 24) {
480: my $hours = floor($delta / $hour);
481: my $minutes = floor(($delta % $hour) / $minute);
482: my $hourString = "$hours hours";
483: my $minuteString = ", $minutes minutes";
484: if ($hours == 1) {
485: $hourString = "1 hour";
486: }
487: if ($minutes == 1) {
488: $minuteString = ", 1 minute";
489: }
490: if ($minutes == 0) {
491: $minuteString = "";
492: }
493: return "$prefix$hourString$minuteString$tense";
494: }
495:
496: # Less then 5 days away, display day of the week and
497: # HH:MM
498: if ( $delta < $day * 5 ) {
1.85 bowersj2 499: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.238 albertel 500: $timeStr =~ s/12:00 am/00:00/;
1.73 bowersj2 501: $timeStr =~ s/12:00 pm/noon/;
502: return ($inPast ? "last " : "next ") .
503: $timeStr;
504: }
505:
506: # Is it this year?
507: if ( $time[5] == $now[5]) {
508: # Return on Month Day, HH:MM meridian
509: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
1.238 albertel 510: $timeStr =~ s/12:00 am/00:00/;
1.73 bowersj2 511: $timeStr =~ s/12:00 pm/noon/;
512: return $timeStr;
513: }
514:
515: # Not this year, so show the year
1.267.2.3 albertel 516: my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
1.238 albertel 517: $timeStr =~ s/12:00 am/00:00/;
1.73 bowersj2 518: $timeStr =~ s/12:00 pm/noon/;
519: return $timeStr;
1.58 albertel 520: }
1.53 bowersj2 521: }
522:
1.51 bowersj2 523:
1.133 bowersj2 524: =pod
525:
1.174 albertel 526: =head1 NAME
527:
1.217 bowersj2 528: Apache::lonnavmap - Subroutines to handle and render the navigation
529: maps
1.174 albertel 530:
531: =head1 SYNOPSIS
532:
533: The main handler generates the navigational listing for the course,
534: the other objects export this information in a usable fashion for
1.205 bowersj2 535: other modules.
1.133 bowersj2 536:
1.216 bowersj2 537: =head1 OVERVIEW
538:
1.217 bowersj2 539: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
1.218 bowersj2 540: course structure and caches it in what is often referred to as the
541: "big hash" X<big hash>. You can see it if you are logged into
542: LON-CAPA, in a course, by going to /adm/test. (You may need to
543: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
544: content of the hash will be under the heading "Big Hash".
1.216 bowersj2 545:
546: Big Hash contains, among other things, how resources are related
547: to each other (next/previous), what resources are maps, which
548: resources are being chosen to not show to the student (for random
549: selection), and a lot of other things that can take a lot of time
550: to compute due to the amount of data that needs to be collected and
551: processed.
552:
553: Apache::lonnavmaps provides an object model for manipulating this
554: information in a higher-level fashion then directly manipulating
555: the hash. It also provides access to several auxilary functions
556: that aren't necessarily stored in the Big Hash, but are a per-
557: resource sort of value, like whether there is any feedback on
558: a given resource.
559:
560: Apache::lonnavmaps also abstracts away branching, and someday,
561: conditions, for the times where you don't really care about those
562: things.
563:
564: Apache::lonnavmaps also provides fairly powerful routines for
565: rendering navmaps, and last but not least, provides the navmaps
566: view for when the user clicks the NAV button.
567:
568: B<Note>: Apache::lonnavmaps I<only> works for the "currently
569: logged in user"; if you want things like "due dates for another
570: student" lonnavmaps can not directly retrieve information like
571: that. You need the EXT function. This module can still help,
572: because many things, such as the course structure, are constant
573: between users, and Apache::lonnavmaps can help by providing
574: symbs for the EXT call.
575:
576: The rest of this file will cover the provided rendering routines,
577: which can often be used without fiddling with the navmap object at
578: all, then documents the Apache::lonnavmaps::navmap object, which
579: is the key to accessing the Big Hash information, covers the use
580: of the Iterator (which provides the logic for traversing the
581: somewhat-complicated Big Hash data structure), documents the
582: Apache::lonnavmaps::Resource objects that are returned by
583:
1.205 bowersj2 584: =head1 Subroutine: render
1.133 bowersj2 585:
1.174 albertel 586: The navmap renderer package provides a sophisticated rendering of the
587: standard navigation maps interface into HTML. The provided nav map
588: handler is actually just a glorified call to this.
1.133 bowersj2 589:
1.216 bowersj2 590: Because of the large number of parameters this function accepts,
1.174 albertel 591: instead of passing it arguments as is normal, pass it in an anonymous
1.216 bowersj2 592: hash with the desired options.
1.174 albertel 593:
594: The package provides a function called 'render', called as
1.205 bowersj2 595: Apache::lonnavmaps::render({}).
1.51 bowersj2 596:
1.133 bowersj2 597: =head2 Overview of Columns
1.51 bowersj2 598:
1.174 albertel 599: The renderer will build an HTML table for the navmap and return
600: it. The table is consists of several columns, and a row for each
601: resource (or possibly each part). You tell the renderer how many
602: columns to create and what to place in each column, optionally using
1.205 bowersj2 603: one or more of the prepared columns, and the renderer will assemble
1.174 albertel 604: the table.
605:
606: Any additional generally useful column types should be placed in the
607: renderer code here, so anybody can use it anywhere else. Any code
608: specific to the current application (such as the addition of <input>
609: elements in a column) should be placed in the code of the thing using
610: the renderer.
611:
612: At the core of the renderer is the array reference COLS (see Example
613: section below for how to pass this correctly). The COLS array will
614: consist of entries of one of two types of things: Either an integer
615: representing one of the pre-packaged column types, or a sub reference
616: that takes a resource reference, a part number, and a reference to the
617: argument hash passed to the renderer, and returns a string that will
618: be inserted into the HTML representation as it.
619:
1.216 bowersj2 620: All other parameters are ways of either changing how the columns
621: are printing, or which rows are shown.
622:
1.174 albertel 623: The pre-packaged column names are refered to by constants in the
1.205 bowersj2 624: Apache::lonnavmaps namespace. The following currently exist:
1.51 bowersj2 625:
1.174 albertel 626: =over 4
1.51 bowersj2 627:
1.216 bowersj2 628: =item * B<Apache::lonnavmaps::resource>:
1.51 bowersj2 629:
1.174 albertel 630: The general info about the resource: Link, icon for the type, etc. The
1.216 bowersj2 631: first column in the standard nav map display. This column provides the
632: indentation effect seen in the B<NAV> screen. This column also accepts
1.205 bowersj2 633: the following parameters in the renderer hash:
1.51 bowersj2 634:
1.133 bowersj2 635: =over 4
1.51 bowersj2 636:
1.216 bowersj2 637: =item * B<resource_nolink>: default false
1.51 bowersj2 638:
1.216 bowersj2 639: If true, the resource will not be linked. By default, all non-folder
640: resources are linked.
1.174 albertel 641:
1.216 bowersj2 642: =item * B<resource_part_count>: default true
1.51 bowersj2 643:
1.216 bowersj2 644: If true, the resource will show a part count B<if> the full
645: part list is not displayed. (See "condense_parts" later.) If false,
646: the resource will never show a part count.
1.133 bowersj2 647:
1.174 albertel 648: =item * B<resource_no_folder_link>:
1.133 bowersj2 649:
1.174 albertel 650: If true, the resource's folder will not be clickable to open or close
651: it. Default is false. True implies printCloseAll is false, since you
652: can't close or open folders when this is on anyhow.
1.144 bowersj2 653:
1.133 bowersj2 654: =back
1.51 bowersj2 655:
1.225 bowersj2 656: =item * B<Apache::lonnavmaps::communication_status>:
1.174 albertel 657:
658: Whether there is discussion on the resource, email for the user, or
659: (lumped in here) perl errors in the execution of the problem. This is
660: the second column in the main nav map.
661:
1.225 bowersj2 662: =item * B<Apache::lonnavmaps::quick_status>:
1.51 bowersj2 663:
1.216 bowersj2 664: An icon for the status of a problem, with five possible states:
665: Correct, incorrect, open, awaiting grading (for a problem where the
666: computer's grade is suppressed, or the computer can't grade, like
667: essay problem), or none (not open yet, not a problem). The
1.174 albertel 668: third column of the standard navmap.
1.51 bowersj2 669:
1.225 bowersj2 670: =item * B<Apache::lonnavmaps::long_status>:
1.174 albertel 671:
672: A text readout of the details of the current status of the problem,
673: such as "Due in 22 hours". The fourth column of the standard navmap.
1.51 bowersj2 674:
1.225 bowersj2 675: =item * B<Apache::lonnavmaps::part_status_summary>:
676:
677: A text readout summarizing the status of the problem. If it is a
678: single part problem, will display "Correct", "Incorrect",
679: "Not yet open", "Open", "Attempted", or "Error". If there are
680: multiple parts, this will output a string that in HTML will show a
681: status of how many parts are in each status, in color coding, trying
682: to match the colors of the icons within reason.
683:
684: Note this only makes sense if you are I<not> showing parts. If
685: C<showParts> is true (see below), this column will not output
686: anything.
687:
1.133 bowersj2 688: =back
1.51 bowersj2 689:
1.133 bowersj2 690: If you add any others please be sure to document them here.
1.51 bowersj2 691:
1.174 albertel 692: An example of a column renderer that will show the ID number of a
693: resource, along with the part name if any:
1.51 bowersj2 694:
1.133 bowersj2 695: sub {
696: my ($resource, $part, $params) = @_;
697: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
698: return '<td>' . $resource->{ID} . '</td>';
699: }
1.51 bowersj2 700:
1.174 albertel 701: Note these functions are responsible for the TD tags, which allow them
702: to override vertical and horizontal alignment, etc.
1.130 www 703:
1.133 bowersj2 704: =head2 Parameters
1.115 bowersj2 705:
1.217 bowersj2 706: Minimally, you should be
1.174 albertel 707: able to get away with just using 'cols' (to specify the columns
708: shown), 'url' (necessary for the folders to link to the current screen
709: correctly), and possibly 'queryString' if your app calls for it. In
710: that case, maintaining the state of the folders will be done
711: automatically.
1.140 bowersj2 712:
1.133 bowersj2 713: =over 4
1.51 bowersj2 714:
1.216 bowersj2 715: =item * B<iterator>: default: constructs one from %ENV
1.174 albertel 716:
717: A reference to a fresh ::iterator to use from the navmaps. The
718: rendering will reflect the options passed to the iterator, so you can
719: use that to just render a certain part of the course, if you like. If
720: one is not passed, the renderer will attempt to construct one from
721: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
722: 'iterator_map' parameter if any.
723:
1.216 bowersj2 724: =item * B<iterator_map>: default: not used
1.174 albertel 725:
726: If you are letting the renderer do the iterator handling, you can
727: instruct the renderer to render only a particular map by passing it
728: the source of the map you want to process, like
729: '/res/103/jerf/navmap.course.sequence'.
730:
1.216 bowersj2 731: =item * B<navmap>: default: constructs one from %ENV
1.174 albertel 732:
733: A reference to a navmap, used only if an iterator is not passed in. If
734: this is necessary to make an iterator but it is not passed in, a new
735: one will be constructed based on ENV info. This is useful to do basic
736: error checking before passing it off to render.
737:
1.216 bowersj2 738: =item * B<r>: default: must be passed in
1.174 albertel 739:
740: The standard Apache response object. This must be passed to the
741: renderer or the course hash will be locked.
742:
1.216 bowersj2 743: =item * B<cols>: default: empty (useless)
1.174 albertel 744:
745: An array reference
746:
1.216 bowersj2 747: =item * B<showParts>:default true
1.174 albertel 748:
1.216 bowersj2 749: A flag. If true, a line for the resource itself, and a line
1.174 albertel 750: for each part will be displayed. If not, only one line for each
751: resource will be displayed.
752:
1.216 bowersj2 753: =item * B<condenseParts>: default true
1.174 albertel 754:
1.216 bowersj2 755: A flag. If true, if all parts of the problem have the same
1.174 albertel 756: status and that status is Nothing Set, Correct, or Network Failure,
757: then only one line will be displayed for that resource anyhow. If no,
758: all parts will always be displayed. If showParts is 0, this is
759: ignored.
760:
1.216 bowersj2 761: =item * B<jumpCount>: default: determined from %ENV
1.174 albertel 762:
1.216 bowersj2 763: A string identifying the URL to place the anchor 'curloc' at.
764: It is the responsibility of the renderer user to
1.174 albertel 765: ensure that the #curloc is in the URL. By default, determined through
766: the use of the ENV{} 'jump' information, and should normally "just
767: work" correctly.
1.144 bowersj2 768:
1.216 bowersj2 769: =item * B<here>: default: empty string
1.140 bowersj2 770:
1.216 bowersj2 771: A Symb identifying where to place the 'here' marker. The empty
772: string means no marker.
1.92 bowersj2 773:
1.216 bowersj2 774: =item * B<indentString>: default: 25 pixel whitespace image
1.164 bowersj2 775:
1.216 bowersj2 776: A string identifying the indentation string to use.
1.92 bowersj2 777:
1.216 bowersj2 778: =item * B<queryString>: default: empty
1.51 bowersj2 779:
1.174 albertel 780: A string which will be prepended to the query string used when the
1.216 bowersj2 781: folders are opened or closed. You can use this to pass
782: application-specific values.
1.55 bowersj2 783:
1.216 bowersj2 784: =item * B<url>: default: none
1.84 bowersj2 785:
1.174 albertel 786: The url the folders will link to, which should be the current
1.216 bowersj2 787: page. Required if the resource info column is shown, and you
788: are allowing the user to open and close folders.
1.115 bowersj2 789:
1.216 bowersj2 790: =item * B<currentJumpIndex>: default: no jumping
1.55 bowersj2 791:
1.174 albertel 792: Describes the currently-open row number to cause the browser to jump
793: to, because the user just opened that folder. By default, pulled from
794: the Jump information in the ENV{'form.*'}.
1.51 bowersj2 795:
1.216 bowersj2 796: =item * B<printKey>: default: false
1.51 bowersj2 797:
1.174 albertel 798: If true, print the key that appears on the top of the standard
1.216 bowersj2 799: navmaps.
1.139 bowersj2 800:
1.216 bowersj2 801: =item * B<printCloseAll>: default: true
1.140 bowersj2 802:
1.174 albertel 803: If true, print the "Close all folders" or "open all folders"
1.216 bowersj2 804: links.
1.140 bowersj2 805:
1.216 bowersj2 806: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1.153 bowersj2 807:
1.174 albertel 808: A function that takes the resource object as its only parameter and
809: returns a true or false value. If true, the resource is displayed. If
1.216 bowersj2 810: false, it is simply skipped in the display.
1.174 albertel 811:
1.216 bowersj2 812: =item * B<suppressEmptySequences>: default: false
1.190 bowersj2 813:
814: If you're using a filter function, and displaying sequences to orient
815: the user, then frequently some sequences will be empty. Setting this to
816: true will cause those sequences not to display, so as not to confuse the
817: user into thinking that if the sequence is there there should be things
1.216 bowersj2 818: under it; for example, see the "Show Uncompleted Homework" view on the
819: B<NAV> screen.
1.190 bowersj2 820:
1.216 bowersj2 821: =item * B<suppressNavmaps>: default: false
1.174 albertel 822:
1.216 bowersj2 823: If true, will not display Navigate Content resources.
1.143 bowersj2 824:
1.133 bowersj2 825: =back
1.51 bowersj2 826:
1.133 bowersj2 827: =head2 Additional Info
1.51 bowersj2 828:
1.174 albertel 829: In addition to the parameters you can pass to the renderer, which will
830: be passed through unchange to the column renderers, the renderer will
831: generate the following information which your renderer may find
832: useful:
833:
1.216 bowersj2 834: =over 4
835:
836: =item * B<counter>:
1.145 bowersj2 837:
1.216 bowersj2 838: Contains the number of rows printed. Useful after calling the render
839: function, as you can detect whether anything was printed at all.
840:
841: =item * B<isNewBranch>:
842:
843: Useful for renderers: If this resource is currently the first resource
844: of a new branch, this will be true. The Resource column (leftmost in the
845: navmaps screen) uses this to display the "new branch" icon
1.59 bowersj2 846:
1.133 bowersj2 847: =back
1.59 bowersj2 848:
1.133 bowersj2 849: =cut
1.59 bowersj2 850:
1.133 bowersj2 851: sub resource { return 0; }
852: sub communication_status { return 1; }
853: sub quick_status { return 2; }
854: sub long_status { return 3; }
1.225 bowersj2 855: sub part_status_summary { return 4; }
1.51 bowersj2 856:
1.133 bowersj2 857: sub render_resource {
858: my ($resource, $part, $params) = @_;
1.51 bowersj2 859:
1.133 bowersj2 860: my $nonLinkedText = ''; # stuff after resource title not in link
1.51 bowersj2 861:
1.134 bowersj2 862: my $link = $params->{"resourceLink"};
863: my $src = $resource->src();
864: my $it = $params->{"iterator"};
1.133 bowersj2 865: my $filter = $it->{FILTER};
866:
867: my $title = $resource->compTitle();
1.258 albertel 868:
1.133 bowersj2 869: my $partLabel = "";
870: my $newBranchText = "";
871:
872: # If this is a new branch, label it so
873: if ($params->{'isNewBranch'}) {
874: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
1.51 bowersj2 875: }
876:
1.133 bowersj2 877: # links to open and close the folder
878: my $linkopen = "<a href='$link'>";
879: my $linkclose = "</a>";
1.51 bowersj2 880:
1.204 albertel 881: # Default icon: unknown page
882: my $icon = "<img src='/adm/lonIcons/unknown.gif' alt='' border='0' />";
1.133 bowersj2 883:
884: if ($resource->is_problem()) {
1.192 bowersj2 885: if ($part eq '0' || $params->{'condensed'}) {
1.133 bowersj2 886: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
887: } else {
888: $icon = $params->{'indentString'};
889: }
1.204 albertel 890: } else {
1.243 albertel 891: $icon = "<img src='".&Apache::loncommon::icon($resource->src).
892: "' alt='' border='0' />";
1.133 bowersj2 893: }
1.51 bowersj2 894:
1.133 bowersj2 895: # Display the correct map icon to open or shut map
896: if ($resource->is_map()) {
897: my $mapId = $resource->map_pc();
898: my $nowOpen = !defined($filter->{$mapId});
899: if ($it->{CONDITION}) {
900: $nowOpen = !$nowOpen;
901: }
1.144 bowersj2 902:
1.205 bowersj2 903: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
904:
1.144 bowersj2 905: if (!$params->{'resource_no_folder_link'}) {
1.205 bowersj2 906: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1.144 bowersj2 907: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
908:
909: $linkopen = "<a href='" . $params->{'url'} . '?' .
910: $params->{'queryString'} . '&filter=';
911: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
912: addToFilter($filter, $mapId) :
913: removeFromFilter($filter, $mapId);
914: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
915: . $params->{'hereType'} . '&here=' .
916: &Apache::lonnet::escape($params->{'here'}) .
1.159 bowersj2 917: '&jump=' .
1.144 bowersj2 918: &Apache::lonnet::escape($resource->symb()) .
919: "&folderManip=1'>";
920: } else {
921: # Don't allow users to manipulate folder
1.205 bowersj2 922: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1.144 bowersj2 923: '.nomanip.gif';
924: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
925:
926: $linkopen = "";
927: $linkclose = "";
928: }
1.133 bowersj2 929: }
1.51 bowersj2 930:
1.133 bowersj2 931: if ($resource->randomout()) {
932: $nonLinkedText .= ' <i>(hidden)</i> ';
933: }
934:
935: # We're done preparing and finally ready to start the rendering
936: my $result = "<td align='left' valign='center'>";
1.140 bowersj2 937:
938: my $indentLevel = $params->{'indentLevel'};
939: if ($newBranchText) { $indentLevel--; }
940:
1.133 bowersj2 941: # print indentation
1.140 bowersj2 942: for (my $i = 0; $i < $indentLevel; $i++) {
1.133 bowersj2 943: $result .= $params->{'indentString'};
1.84 bowersj2 944: }
945:
1.133 bowersj2 946: # Decide what to display
947: $result .= "$newBranchText$linkopen$icon$linkclose";
948:
949: my $curMarkerBegin = '';
950: my $curMarkerEnd = '';
1.51 bowersj2 951:
1.133 bowersj2 952: # Is this the current resource?
1.158 bowersj2 953: if (!$params->{'displayedHereMarker'} &&
954: $resource->symb() eq $params->{'here'} ) {
1.133 bowersj2 955: $curMarkerBegin = '<font color="red" size="+2">> </font>';
956: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1.158 bowersj2 957: $params->{'displayedHereMarker'} = 1;
1.51 bowersj2 958: }
959:
1.192 bowersj2 960: if ($resource->is_problem() && $part ne '0' &&
1.133 bowersj2 961: !$params->{'condensed'}) {
1.245 www 962: my $displaypart=&Apache::lonnet::EXT('resource.'.$part.'.display',
963: $resource->symb());
964: unless ($displaypart) { $displaypart=$part; }
965: $partLabel = " (Part: $displaypart)";
966: $link.='#'.&Apache::lonnet::escape($part);
1.133 bowersj2 967: $title = "";
1.51 bowersj2 968: }
969:
1.163 bowersj2 970: if ($params->{'condensed'} && $resource->countParts() > 1) {
1.133 bowersj2 971: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51 bowersj2 972: }
973:
1.266 raeburn 974: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1.144 bowersj2 975: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
976: } else {
977: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
978: }
1.51 bowersj2 979:
1.133 bowersj2 980: return $result;
981: }
1.51 bowersj2 982:
1.133 bowersj2 983: sub render_communication_status {
984: my ($resource, $part, $params) = @_;
1.134 bowersj2 985: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
986:
987: my $link = $params->{"resourceLink"};
988: my $linkopen = "<a href='$link'>";
989: my $linkclose = "</a>";
990:
991: if ($resource->hasDiscussion()) {
992: $discussionHTML = $linkopen .
993: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
994: $linkclose;
995: }
996:
997: if ($resource->getFeedback()) {
998: my $feedback = $resource->getFeedback();
999: foreach (split(/\,/, $feedback)) {
1000: if ($_) {
1001: $feedbackHTML .= ' <a href="/adm/email?display='
1002: . &Apache::lonnet::escape($_) . '">'
1003: . '<img src="/adm/lonMisc/feedback.gif" '
1004: . 'border="0" /></a>';
1005: }
1006: }
1007: }
1008:
1009: if ($resource->getErrors()) {
1010: my $errors = $resource->getErrors();
1.254 matthew 1011: my $errorcount = 0;
1.134 bowersj2 1012: foreach (split(/,/, $errors)) {
1.254 matthew 1013: last if ($errorcount>=10); # Only output 10 bombs maximum
1.134 bowersj2 1014: if ($_) {
1.254 matthew 1015: $errorcount++;
1.134 bowersj2 1016: $errorHTML .= ' <a href="/adm/email?display='
1017: . &Apache::lonnet::escape($_) . '">'
1018: . '<img src="/adm/lonMisc/bomb.gif" '
1019: . 'border="0" /></a>';
1020: }
1021: }
1.197 bowersj2 1022: }
1023:
1024: if ($params->{'multipart'} && $part != '0') {
1025: $discussionHTML = $feedbackHTML = $errorHTML = '';
1.134 bowersj2 1026: }
1027:
1028: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1029:
1.133 bowersj2 1030: }
1031: sub render_quick_status {
1032: my ($resource, $part, $params) = @_;
1.135 bowersj2 1033: my $result = "";
1034: my $firstDisplayed = !$params->{'condensed'} &&
1035: $params->{'multipart'} && $part eq "0";
1036:
1037: my $link = $params->{"resourceLink"};
1038: my $linkopen = "<a href='$link'>";
1039: my $linkclose = "</a>";
1040:
1041: if ($resource->is_problem() &&
1042: !$firstDisplayed) {
1.224 bowersj2 1043:
1044: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1.135 bowersj2 1045: my $alt = $iconAltTags{$icon};
1046: if ($icon) {
1047: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1048: } else {
1049: $result .= "<td width='30'> </td>\n";
1050: }
1051: } else { # not problem, no icon
1052: $result .= "<td width='30'> </td>\n";
1053: }
1054:
1055: return $result;
1.133 bowersj2 1056: }
1057: sub render_long_status {
1058: my ($resource, $part, $params) = @_;
1.136 bowersj2 1059: my $result = "<td align='right' valign='center'>\n";
1060: my $firstDisplayed = !$params->{'condensed'} &&
1061: $params->{'multipart'} && $part eq "0";
1062:
1063: my $color;
1.212 bowersj2 1064: if ($resource->is_problem()) {
1.136 bowersj2 1065: $color = $colormap{$resource->status};
1066:
1.252 matthew 1067: if (dueInLessThan24Hours($resource, $part) ||
1.136 bowersj2 1068: lastTry($resource, $part)) {
1069: $color = $hurryUpColor;
1070: }
1071: }
1072:
1073: if ($resource->kind() eq "res" &&
1074: $resource->is_problem() &&
1075: !$firstDisplayed) {
1076: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1077: $result .= getDescription($resource, $part);
1078: if ($color) {$result .= "</b></font>"; }
1079: }
1080: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1081: $result .= '(randomly select ' . $resource->randompick() .')';
1082: }
1.210 bowersj2 1083:
1.213 bowersj2 1084: # Debugging code
1085: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1086: # ' - Part: ' . $part;
1087:
1.210 bowersj2 1088: $result .= "</td>\n";
1.136 bowersj2 1089:
1090: return $result;
1.51 bowersj2 1091: }
1092:
1.227 bowersj2 1093: # Colors obtained by taking the icons, matching the colors, and
1094: # possibly reducing the Value (HSV) of the color, if it's too bright
1095: # for text, generally by one third or so.
1.225 bowersj2 1096: my %statusColors =
1097: (
1098: $resObj->CLOSED => '#000000',
1.227 bowersj2 1099: $resObj->OPEN => '#998b13',
1100: $resObj->CORRECT => '#26933f',
1101: $resObj->INCORRECT => '#c48207',
1102: $resObj->ATTEMPTED => '#a87510',
1.225 bowersj2 1103: $resObj->ERROR => '#000000'
1104: );
1105: my %statusStrings =
1106: (
1107: $resObj->CLOSED => 'Not yet open',
1108: $resObj->OPEN => 'Open',
1109: $resObj->CORRECT => 'Correct',
1110: $resObj->INCORRECT => 'Incorrect',
1111: $resObj->ATTEMPTED => 'Attempted',
1112: $resObj->ERROR => 'Network Error'
1113: );
1114: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1115:
1116: use Data::Dumper;
1117: sub render_parts_summary_status {
1118: my ($resource, $part, $params) = @_;
1.256 albertel 1119: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1.225 bowersj2 1120: if ($params->{showParts}) {
1121: return '<td></td>';
1122: }
1123:
1124: my $td = "<td align='right'>\n";
1125: my $endtd = "</td>\n";
1.256 albertel 1126: my @probs;
1.225 bowersj2 1127:
1.256 albertel 1128: if ($resource->contains_problem) {
1129: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1130: } else {
1131: @probs=($resource);
1132: }
1133: my $return;
1134: my %overallstatus;
1135: my $totalParts;
1136: foreach my $resource (@probs) {
1137: # If there is a single part, just show the simple status
1138: if ($resource->singlepart()) {
1139: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1140: $overallstatus{$status}++;
1141: $totalParts++;
1142: next;
1143: }
1144: # Now we can be sure the $part doesn't really matter.
1145: my $statusCount = $resource->simpleStatusCount();
1146: my @counts;
1147: foreach my $status (@statuses) {
1148: # decouple display order from the simpleStatusCount order
1149: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1150: if ($statusCount->[$slot]) {
1151: $overallstatus{$status}+=$statusCount->[$slot];
1152: $totalParts+=$statusCount->[$slot];
1153: }
1154: }
1155: }
1156: $return.= $td . $totalParts . ' parts: ';
1157: foreach my $status (@statuses) {
1158: if ($overallstatus{$status}) {
1159: $return.="<font color='" . $statusColors{$status} .
1160: "'>" . $overallstatus{$status} . ' '
1.225 bowersj2 1161: . $statusStrings{$status} . "</font>";
1162: }
1163: }
1.256 albertel 1164: $return.= $endtd;
1165: return $return;
1.225 bowersj2 1166: }
1167:
1.133 bowersj2 1168: my @preparedColumns = (\&render_resource, \&render_communication_status,
1.225 bowersj2 1169: \&render_quick_status, \&render_long_status,
1170: \&render_parts_summary_status);
1.132 bowersj2 1171:
1172: sub setDefault {
1173: my ($val, $default) = @_;
1174: if (!defined($val)) { return $default; }
1175: return $val;
1176: }
1177:
1178: sub render {
1179: my $args = shift;
1.140 bowersj2 1180: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1181: my $result = '';
1182:
1.132 bowersj2 1183: # Configure the renderer.
1184: my $cols = $args->{'cols'};
1185: if (!defined($cols)) {
1186: # no columns, no nav maps.
1187: return '';
1188: }
1.140 bowersj2 1189: my $mustCloseNavMap = 0;
1190: my $navmap;
1191: if (defined($args->{'navmap'})) {
1192: $navmap = $args->{'navmap'};
1193: }
1194:
1.158 bowersj2 1195: my $r = $args->{'r'};
1.140 bowersj2 1196: my $queryString = $args->{'queryString'};
1.159 bowersj2 1197: my $jump = $args->{'jump'};
1.158 bowersj2 1198: my $here = $args->{'here'};
1.153 bowersj2 1199: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.256 albertel 1200: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1.140 bowersj2 1201: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1202: # before the current resource when using #current
1203:
1204: # If we were passed 'here' information, we are not rendering
1205: # after a folder manipulation, and we were not passed an
1206: # iterator, make sure we open the folders to show the "here"
1207: # marker
1208: my $filterHash = {};
1209: # Figure out what we're not displaying
1210: foreach (split(/\,/, $ENV{"form.filter"})) {
1211: if ($_) {
1212: $filterHash->{$_} = "1";
1213: }
1214: }
1215:
1.191 bowersj2 1216: # Filter: Remember filter function and add our own filter: Refuse
1217: # to show hidden resources unless the user can see them.
1218: my $userCanSeeHidden = advancedUser();
1219: my $filterFunc = setDefault($args->{'filterFunc'},
1220: sub {return 1;});
1221: if (!$userCanSeeHidden) {
1222: # Without renaming the filterfunc, the server seems to go into
1223: # an infinite loop
1224: my $oldFilterFunc = $filterFunc;
1225: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1226: &$oldFilterFunc($res);};
1227: }
1228:
1.140 bowersj2 1229: my $condition = 0;
1230: if ($ENV{'form.condition'}) {
1231: $condition = 1;
1232: }
1233:
1234: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1235: # Step 1: Check to see if we have a navmap
1236: if (!defined($navmap)) {
1.221 bowersj2 1237: $navmap = Apache::lonnavmaps::navmap->new();
1.140 bowersj2 1238: $mustCloseNavMap = 1;
1239: }
1240:
1241: # Step two: Locate what kind of here marker is necessary
1242: # Determine where the "here" marker is and where the screen jumps to.
1243:
1.175 bowersj2 1244: if ($ENV{'form.postsymb'}) {
1245: $here = $jump = $ENV{'form.postsymb'};
1.140 bowersj2 1246: } elsif ($ENV{'form.postdata'}) {
1247: # couldn't find a symb, is there a URL?
1248: my $currenturl = $ENV{'form.postdata'};
1.158 bowersj2 1249: #$currenturl=~s/^http\:\/\///;
1250: #$currenturl=~s/^[^\/]+//;
1.140 bowersj2 1251:
1.158 bowersj2 1252: $here = $jump = &Apache::lonnet::symbread($currenturl);
1.140 bowersj2 1253: }
1.158 bowersj2 1254:
1.140 bowersj2 1255: # Step three: Ensure the folders are open
1256: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.222 bowersj2 1257: my $curRes;
1.140 bowersj2 1258: my $found = 0;
1259:
1260: # We only need to do this if we need to open the maps to show the
1261: # current position. This will change the counter so we can't count
1262: # for the jump marker with this loop.
1.267.2.5 albertel 1263: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1.158 bowersj2 1264: if (ref($curRes) && $curRes->symb() eq $here) {
1.140 bowersj2 1265: my $mapStack = $mapIterator->getStack();
1266:
1267: # Ensure the parent maps are open
1268: for my $map (@{$mapStack}) {
1269: if ($condition) {
1270: undef $filterHash->{$map->map_pc()};
1271: } else {
1272: $filterHash->{$map->map_pc()} = 1;
1273: }
1274: }
1275: $found = 1;
1276: }
1277: }
1.159 bowersj2 1278: }
1.140 bowersj2 1279:
1280: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1281: # If this is a click on a folder or something, we want to preserve the "here"
1282: # from the querystring, and get the new "jump" marker
1283: $here = $ENV{'form.here'};
1284: $jump = $ENV{'form.jump'};
1285: }
1286:
1.132 bowersj2 1287: my $it = $args->{'iterator'};
1288: if (!defined($it)) {
1.140 bowersj2 1289: # Construct a default iterator based on $ENV{'form.'} information
1290:
1291: # Step 1: Check to see if we have a navmap
1292: if (!defined($navmap)) {
1.221 bowersj2 1293: $navmap = Apache::lonnavmaps::navmap->new();
1.140 bowersj2 1294: $mustCloseNavMap = 1;
1295: }
1296:
1.144 bowersj2 1297: # See if we're being passed a specific map
1298: if ($args->{'iterator_map'}) {
1299: my $map = $args->{'iterator_map'};
1.145 bowersj2 1300: $map = $navmap->getResourceByUrl($map);
1.144 bowersj2 1301: my $firstResource = $map->map_start();
1302: my $finishResource = $map->map_finish();
1303:
1304: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1305: } else {
1306: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1307: }
1.132 bowersj2 1308: }
1.256 albertel 1309:
1.159 bowersj2 1310: # (re-)Locate the jump point, if any
1.191 bowersj2 1311: # Note this does not take filtering or hidden into account... need
1312: # to be fixed?
1.159 bowersj2 1313: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1.222 bowersj2 1314: my $curRes;
1.159 bowersj2 1315: my $foundJump = 0;
1316: my $counter = 0;
1317:
1.222 bowersj2 1318: while (($curRes = $mapIterator->next()) && !$foundJump) {
1.159 bowersj2 1319: if (ref($curRes)) { $counter++; }
1320:
1321: if (ref($curRes) && $jump eq $curRes->symb()) {
1322:
1323: # This is why we have to use the main iterator instead of the
1324: # potentially faster DFS: The count has to be the same, so
1325: # the order has to be the same, which DFS won't give us.
1326: $args->{'currentJumpIndex'} = $counter;
1327: $foundJump = 1;
1328: }
1329: }
1330:
1.132 bowersj2 1331: my $showParts = setDefault($args->{'showParts'}, 1);
1332: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139 bowersj2 1333: # keeps track of when the current resource is found,
1334: # so we can back up a few and put the anchor above the
1335: # current resource
1.140 bowersj2 1336: my $printKey = $args->{'printKey'};
1337: my $printCloseAll = $args->{'printCloseAll'};
1338: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.144 bowersj2 1339:
1.140 bowersj2 1340: # Print key?
1341: if ($printKey) {
1342: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1343: my $date=localtime;
1344: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1345: if ($navmap->{LAST_CHECK}) {
1346: $result .=
1.230 www 1347: '<img src="/adm/lonMisc/chat.gif"> '.&mt('New discussion since').' '.
1.140 bowersj2 1348: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1349: '</td><td align="center" valign="bottom"> '.
1.230 www 1350: '<img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1.140 bowersj2 1351: '</td>';
1352: } else {
1353: $result .= '<td align="center" valign="bottom"> '.
1.230 www 1354: '<img src="/adm/lonMisc/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1355: ' <img src="/adm/lonMisc/feedback.gif"> '.&mt('New message (click to open)').
1.140 bowersj2 1356: '</td>';
1357: }
1358:
1359: $result .= '</tr></table>';
1360: }
1361:
1.172 bowersj2 1362: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.140 bowersj2 1363: if ($condition) {
1364: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1.158 bowersj2 1365: "&here=" . Apache::lonnet::escape($here) .
1.230 www 1366: "\">".&mt('Close All Folders')."</a>";
1.140 bowersj2 1367: } else {
1368: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1.158 bowersj2 1369: "&here=" . Apache::lonnet::escape($here) .
1.230 www 1370: "\">".&mt('Open All Folders')."</a>";
1.140 bowersj2 1371: }
1.266 raeburn 1372: $result .= "\n";
1373: }
1.140 bowersj2 1374:
1.266 raeburn 1375: # Check for any unread discussions in all resources.
1.267.2.6 albertel 1376: if (0 && !$args->{'resource_no_folder_link'}) {
1.267 albertel 1377: my $totdisc = 0;
1378: my $haveDisc = '';
1379: my @allres=$navmap->retrieveResources();
1380: foreach my $resource (@allres) {
1381: if ($resource->hasDiscussion()) {
1382: my $ressymb;
1383: if ($resource->symb() =~ m-(___adm/\w+/\w+)/(\d+)/bulletinboard$-) {
1384: $ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
1385: } else {
1386: $ressymb = $resource->symb();
1387: }
1388: $haveDisc .= $ressymb.':';
1389: $totdisc ++;
1390: }
1391: }
1392: if ($totdisc > 0) {
1393: $haveDisc =~ s/:$//;
1394: my %lt = &Apache::lonlocal::texthash(
1395: 'mapr' => 'Mark all posts read',
1396: );
1397: $result .= (<<END);
1398: <a href="javascript:document.clearbubbles.submit()">$lt{'mapr'}</a> <a href="javascript:void(open('/adm/help/NavMaps_MarkPosts_Read.hlp', 'Help_for_NavMaps_MarkPosts', 'menubar=0,toolbar=1,scrollbars=1,width=350,height=400,resizable=yes'))" title="Online Help"><image src="/adm/help/gif/smallHelp.gif" border="0" alt="(Help: NavMaps_MarkPostsLink)" /></a>
1399: <form name="clearbubbles" method="post" action="/adm/feedback">
1400: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1401: <input type="hidden" name="navmaps" value="$haveDisc" />
1402: </form>
1.266 raeburn 1403: END
1.267 albertel 1404: } else {
1405: $result .= '<br />';
1406: }
1.266 raeburn 1407: }
1408: $result .= "<br />\n";
1.140 bowersj2 1409: if ($r) {
1410: $r->print($result);
1411: $r->rflush();
1412: $result = "";
1413: }
1.132 bowersj2 1414: # End parameter setting
1.133 bowersj2 1415:
1.132 bowersj2 1416: # Data
1.140 bowersj2 1417: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132 bowersj2 1418: my $res = "Apache::lonnavmaps::resource";
1419: my %condenseStatuses =
1420: ( $res->NETWORK_FAILURE => 1,
1421: $res->NOTHING_SET => 1,
1422: $res->CORRECT => 1 );
1423: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133 bowersj2 1424:
1425: # Shared variables
1426: $args->{'counter'} = 0; # counts the rows
1427: $args->{'indentLevel'} = 0;
1428: $args->{'isNewBranch'} = 0;
1429: $args->{'condensed'} = 0;
1430: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1431: $args->{'displayedHereMarker'} = 0;
1.132 bowersj2 1432:
1.190 bowersj2 1433: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1434: # since structure actually doesn't matter, except what map has what resources.
1435: if ($args->{'suppressEmptySequences'}) {
1436: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1437: $it->{FIRST_RESOURCE},
1438: $it->{FINISH_RESOURCE},
1439: {}, undef, 1);
1.222 bowersj2 1440: my $depth = 0;
1.190 bowersj2 1441: $dfsit->next();
1442: my $curRes = $dfsit->next();
1443: while ($depth > -1) {
1444: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1445: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1446:
1447: if (ref($curRes)) {
1448: # Parallel pre-processing: Do sequences have non-filtered-out children?
1.201 bowersj2 1449: if ($curRes->is_map()) {
1.190 bowersj2 1450: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1451: # Sequences themselves do not count as visible children,
1452: # unless those sequences also have visible children.
1453: # This means if a sequence appears, there's a "promise"
1454: # that there's something under it if you open it, somewhere.
1455: } else {
1456: # Not a sequence: if it's filtered, ignore it, otherwise
1457: # rise up the stack and mark the sequences as having children
1458: if (&$filterFunc($curRes)) {
1459: for my $sequence (@{$dfsit->getStack()}) {
1460: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1461: }
1462: }
1463: }
1464: }
1465: } continue {
1466: $curRes = $dfsit->next();
1467: }
1468: }
1469:
1.133 bowersj2 1470: my $displayedJumpMarker = 0;
1.132 bowersj2 1471: # Set up iteration.
1472: my $now = time();
1473: my $in24Hours = $now + 24 * 60 * 60;
1474: my $rownum = 0;
1475:
1.141 bowersj2 1476: # export "here" marker information
1477: $args->{'here'} = $here;
1478:
1.222 bowersj2 1479: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1.256 albertel 1480: while ($curRes = $it->next($closeAllPages)) {
1.132 bowersj2 1481: # Maintain indentation level.
1482: if ($curRes == $it->BEGIN_MAP() ||
1483: $curRes == $it->BEGIN_BRANCH() ) {
1.133 bowersj2 1484: $args->{'indentLevel'}++;
1.132 bowersj2 1485: }
1486: if ($curRes == $it->END_MAP() ||
1487: $curRes == $it->END_BRANCH() ) {
1.133 bowersj2 1488: $args->{'indentLevel'}--;
1.132 bowersj2 1489: }
1490: # Notice new branches
1491: if ($curRes == $it->BEGIN_BRANCH()) {
1.133 bowersj2 1492: $args->{'isNewBranch'} = 1;
1493: }
1494:
1495: # If this isn't an actual resource, continue on
1496: if (!ref($curRes)) {
1497: next;
1.132 bowersj2 1498: }
1.133 bowersj2 1499:
1.143 bowersj2 1500: # If this has been filtered out, continue on
1501: if (!(&$filterFunc($curRes))) {
1502: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1503: next;
1504: }
1.132 bowersj2 1505:
1.190 bowersj2 1506: # If this is an empty sequence and we're filtering them, continue on
1.201 bowersj2 1507: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1.190 bowersj2 1508: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1509: next;
1510: }
1511:
1.153 bowersj2 1512: # If we're suppressing navmaps and this is a navmap, continue on
1513: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1514: next;
1515: }
1516:
1.191 bowersj2 1517: $args->{'counter'}++;
1518:
1.132 bowersj2 1519: # Does it have multiple parts?
1.133 bowersj2 1520: $args->{'multipart'} = 0;
1521: $args->{'condensed'} = 0;
1.132 bowersj2 1522: my @parts;
1523:
1524: # Decide what parts to show.
1.133 bowersj2 1525: if ($curRes->is_problem() && $showParts) {
1.132 bowersj2 1526: @parts = @{$curRes->parts()};
1.192 bowersj2 1527: $args->{'multipart'} = $curRes->multipart();
1.132 bowersj2 1528:
1529: if ($condenseParts) { # do the condensation
1530: if (!$curRes->opendate("0")) {
1.162 bowersj2 1531: @parts = ();
1.133 bowersj2 1532: $args->{'condensed'} = 1;
1.132 bowersj2 1533: }
1.133 bowersj2 1534: if (!$args->{'condensed'}) {
1.132 bowersj2 1535: # Decide whether to condense based on similarity
1.192 bowersj2 1536: my $status = $curRes->status($parts[0]);
1537: my $due = $curRes->duedate($parts[0]);
1538: my $open = $curRes->opendate($parts[0]);
1.132 bowersj2 1539: my $statusAllSame = 1;
1540: my $dueAllSame = 1;
1541: my $openAllSame = 1;
1.192 bowersj2 1542: for (my $i = 1; $i < scalar(@parts); $i++) {
1.132 bowersj2 1543: if ($curRes->status($parts[$i]) != $status){
1544: $statusAllSame = 0;
1545: }
1546: if ($curRes->duedate($parts[$i]) != $due ) {
1547: $dueAllSame = 0;
1548: }
1549: if ($curRes->opendate($parts[$i]) != $open) {
1550: $openAllSame = 0;
1551: }
1552: }
1553: # $*allSame is true if all the statuses were
1554: # the same. Now, if they are all the same and
1555: # match one of the statuses to condense, or they
1556: # are all open with the same due date, or they are
1557: # all OPEN_LATER with the same open date, display the
1558: # status of the first non-zero part (to get the 'correct'
1559: # status right, since 0 is never 'correct' or 'open').
1560: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1561: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1562: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.192 bowersj2 1563: @parts = ($parts[0]);
1.133 bowersj2 1564: $args->{'condensed'} = 1;
1.132 bowersj2 1565: }
1566: }
1.198 bowersj2 1567: # Multipart problem with one part: always "condense" (happens
1568: # to match the desirable behavior)
1569: if ($curRes->countParts() == 1) {
1570: @parts = ($parts[0]);
1571: $args->{'condensed'} = 1;
1572: }
1.132 bowersj2 1573: }
1.157 bowersj2 1574: }
1.132 bowersj2 1575:
1576: # If the multipart problem was condensed, "forget" it was multipart
1577: if (scalar(@parts) == 1) {
1.133 bowersj2 1578: $args->{'multipart'} = 0;
1.192 bowersj2 1579: } else {
1580: # Add part 0 so we display it correctly.
1581: unshift @parts, '0';
1.132 bowersj2 1582: }
1583:
1584: # Now, we've decided what parts to show. Loop through them and
1585: # show them.
1.192 bowersj2 1586: foreach my $part (@parts) {
1.132 bowersj2 1587: $rownum ++;
1588: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1589:
1590: $result .= " <tr bgcolor='$backgroundColor'>\n";
1.134 bowersj2 1591:
1592: # Set up some data about the parts that the cols might want
1593: my $filter = $it->{FILTER};
1594: my $stack = $it->getStack();
1595: my $src = getLinkForResource($stack);
1.249 www 1596: my $anchor='';
1597: if ($src=~s/(\#.*$)//) {
1598: $anchor=$1;
1599: }
1.134 bowersj2 1600: my $srcHasQuestion = $src =~ /\?/;
1601: $args->{"resourceLink"} = $src.
1602: ($srcHasQuestion?'&':'?') .
1.249 www 1603: 'symb=' . &Apache::lonnet::escape($curRes->symb()).
1604: $anchor;
1.132 bowersj2 1605:
1606: # Now, display each column.
1607: foreach my $col (@$cols) {
1.139 bowersj2 1608: my $colHTML = '';
1609: if (ref($col)) {
1610: $colHTML .= &$col($curRes, $part, $args);
1611: } else {
1612: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1613: }
1.132 bowersj2 1614:
1.133 bowersj2 1615: # If this is the first column and it's time to print
1616: # the anchor, do so
1617: if ($col == $cols->[0] &&
1618: $args->{'counter'} == $args->{'currentJumpIndex'} -
1.139 bowersj2 1619: $currentJumpDelta) {
1620: # Jam the anchor after the <td> tag;
1621: # necessary for valid HTML (which Mozilla requires)
1622: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133 bowersj2 1623: $displayedJumpMarker = 1;
1624: }
1.139 bowersj2 1625: $result .= $colHTML . "\n";
1.132 bowersj2 1626: }
1.139 bowersj2 1627: $result .= " </tr>\n";
1.140 bowersj2 1628: $args->{'isNewBranch'} = 0;
1.139 bowersj2 1629: }
1.153 bowersj2 1630:
1.139 bowersj2 1631: if ($r && $rownum % 20 == 0) {
1632: $r->print($result);
1633: $result = "";
1634: $r->rflush();
1.132 bowersj2 1635: }
1.156 bowersj2 1636: } continue {
1.208 bowersj2 1637: if ($r) {
1638: # If we have the connection, make sure the user is still connected
1639: my $c = $r->connection;
1640: if ($c->aborted()) {
1641: # Who cares what we do, nobody will see it anyhow.
1642: return '';
1643: }
1644: }
1.132 bowersj2 1645: }
1646:
1.134 bowersj2 1647: # Print out the part that jumps to #curloc if it exists
1.159 bowersj2 1648: # delay needed because the browser is processing the jump before
1649: # it finishes rendering, so it goes to the wrong place!
1650: # onload might be better, but this routine has no access to that.
1651: # On mozilla, the 0-millisecond timeout seems to prevent this;
1652: # it's quite likely this might fix other browsers, too, and
1653: # certainly won't hurt anything.
1.139 bowersj2 1654: if ($displayedJumpMarker) {
1.247 albertel 1655: $result .= "
1656: <script>
1657: if (location.href.indexOf('#curloc')==-1) {
1658: setTimeout(\"location += '#curloc';\", 0)
1659: }
1660: </script>";
1.134 bowersj2 1661: }
1662:
1.132 bowersj2 1663: $result .= "</table>";
1.140 bowersj2 1664:
1665: if ($r) {
1666: $r->print($result);
1667: $result = "";
1668: $r->rflush();
1669: }
1670:
1.175 bowersj2 1671: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1.132 bowersj2 1672:
1673: return $result;
1674: }
1675:
1.133 bowersj2 1676: 1;
1677:
1678: package Apache::lonnavmaps::navmap;
1679:
1680: =pod
1681:
1.216 bowersj2 1682: =head1 Object: Apache::lonnavmaps::navmap
1.133 bowersj2 1683:
1.217 bowersj2 1684: =head2 Overview
1.133 bowersj2 1685:
1.217 bowersj2 1686: The navmap object's job is to provide access to the resources
1687: in the course as Apache::lonnavmaps::resource objects, and to
1688: query and manage the relationship between those resource objects.
1689:
1690: Generally, you'll use the navmap object in one of three basic ways.
1691: In order of increasing complexity and power:
1692:
1693: =over 4
1694:
1695: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
1696: various ways to obtain resource objects, based on various identifiers.
1697: Use this when you want to request information about one object or
1698: a handful of resources you already know the identities of, from some
1699: other source. For more about Ids, Symbs, and MapPcs, see the
1700: Resource documentation. Note that Url should be a B<last resort>,
1701: not your first choice; it only works when there is only one
1702: instance of the resource in the course, which only applies to
1703: maps, and even that may change in the future.
1704:
1705: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1706: retrieves resources matching some criterion and returns them
1707: in a flat array, with no structure information. Use this when
1708: you are manipulating a series of resources, based on what map
1709: the are in, but do not care about branching, or exactly how
1710: the maps and resources are related. This is the most common case.
1711:
1712: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1713: the course's navmap in various ways without writing the traversal
1714: code yourself. See iterator documentation below. Use this when
1715: you need to know absolutely everything about the course, including
1716: branches and the precise relationship between maps and resources.
1717:
1718: =back
1719:
1720: =head2 Creation And Destruction
1721:
1722: To create a navmap object, use the following function:
1.133 bowersj2 1723:
1724: =over 4
1725:
1.221 bowersj2 1726: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1.133 bowersj2 1727:
1.221 bowersj2 1728: Creates a new navmap object. Returns the navmap object if this is
1729: successful, or B<undef> if not.
1.174 albertel 1730:
1.216 bowersj2 1731: =back
1732:
1.217 bowersj2 1733: When you are done with the $navmap object, you I<must> call
1734: $navmap->untieHashes(), or you'll prevent the current user from using that
1735: course until the web server is restarted. (!)
1736:
1.216 bowersj2 1737: =head2 Methods
1738:
1739: =over 4
1740:
1.174 albertel 1741: =item * B<getIterator>(first, finish, filter, condition):
1742:
1743: See iterator documentation below.
1.133 bowersj2 1744:
1745: =cut
1746:
1747: use strict;
1748: use GDBM_File;
1749:
1750: sub new {
1751: # magic invocation to create a class instance
1752: my $proto = shift;
1753: my $class = ref($proto) || $proto;
1754: my $self = {};
1755:
1756: # Resource cache stores navmap resources as we reference them. We generate
1757: # them on-demand so we don't pay for creating resources unless we use them.
1758: $self->{RESOURCE_CACHE} = {};
1759:
1760: # Network failure flag, if we accessed the course or user opt and
1761: # failed
1762: $self->{NETWORK_FAILURE} = 0;
1763:
1764: # tie the nav hash
1765:
1.168 bowersj2 1766: my %navmaphash;
1767: my %parmhash;
1.220 bowersj2 1768: my $courseFn = $ENV{"request.course.fn"};
1769: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1.133 bowersj2 1770: &GDBM_READER(), 0640))) {
1771: return undef;
1772: }
1773:
1.220 bowersj2 1774: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1.133 bowersj2 1775: &GDBM_READER(), 0640)))
1776: {
1.170 matthew 1777: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1778: return undef;
1779: }
1780:
1.199 bowersj2 1781: $self->{NAV_HASH} = \%navmaphash;
1.168 bowersj2 1782: $self->{PARM_HASH} = \%parmhash;
1.221 bowersj2 1783: $self->{PARM_CACHE} = {};
1.133 bowersj2 1784:
1785: bless($self);
1786:
1787: return $self;
1788: }
1789:
1.221 bowersj2 1790: sub generate_course_user_opt {
1.133 bowersj2 1791: my $self = shift;
1.221 bowersj2 1792: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1.133 bowersj2 1793:
1.221 bowersj2 1794: my $uname=$ENV{'user.name'};
1795: my $udom=$ENV{'user.domain'};
1796: my $uhome=$ENV{'user.home'};
1797: my $cid=$ENV{'request.course.id'};
1798: my $chome=$ENV{'course.'.$cid.'.home'};
1799: my ($cdom,$cnum)=split(/\_/,$cid);
1800:
1801: my $userprefix=$uname.'_'.$udom.'_';
1802:
1803: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1804: unless ($uhome eq 'no_host') {
1.133 bowersj2 1805: # ------------------------------------------------- Get coursedata (if present)
1.221 bowersj2 1806: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1807: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1808: ':resourcedata',$chome);
1809: # Check for network failure
1810: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1811: $self->{NETWORK_FAILURE} = 1;
1812: } elsif ($reply!~/^error\:/) {
1813: $courserdatas{$cid}=$reply;
1814: $courserdatas{$cid.'.last_cache'}=time;
1815: }
1816: }
1817: foreach (split(/\&/,$courserdatas{$cid})) {
1818: my ($name,$value)=split(/\=/,$_);
1819: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1820: &Apache::lonnet::unescape($value);
1821: }
1.133 bowersj2 1822: # --------------------------------------------------- Get userdata (if present)
1.221 bowersj2 1823: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1824: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1825: if ($reply!~/^error\:/) {
1826: $userrdatas{$uname.'___'.$udom}=$reply;
1827: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1828: }
1829: # check to see if network failed
1830: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1831: {
1832: $self->{NETWORK_FAILURE} = 1;
1833: }
1834: }
1835: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1836: my ($name,$value)=split(/\=/,$_);
1837: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1838: &Apache::lonnet::unescape($value);
1839: }
1840: $self->{COURSE_OPT} = \%courseopt;
1841: $self->{USER_OPT} = \%useropt;
1842: }
1843:
1844: $self->{COURSE_USER_OPT_GENERATED} = 1;
1845:
1846: return;
1847: }
1848:
1849: sub generate_email_discuss_status {
1850: my $self = shift;
1.259 raeburn 1851: my $symb = shift;
1.221 bowersj2 1852: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1.133 bowersj2 1853:
1.221 bowersj2 1854: my $cid=$ENV{'request.course.id'};
1855: my ($cdom,$cnum)=split(/\_/,$cid);
1856:
1857: my %emailstatus = &Apache::lonnet::dump('email_status');
1858: my $logoutTime = $emailstatus{'logout'};
1859: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1860: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1861: $courseLeaveTime : $logoutTime);
1862: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1863: $cdom, $cnum);
1.259 raeburn 1864: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
1865: $ENV{'user.domain'},$ENV{'user.name'},'lastread');
1866: my %lastreadtime = ();
1867: foreach (keys %lastread) {
1868: my $key = $_;
1869: $key =~ s/_lastread$//;
1870: $lastreadtime{$key} = $lastread{$_};
1871: }
1872:
1.221 bowersj2 1873: my %feedback=();
1874: my %error=();
1875: my $keys = &Apache::lonnet::reply('keys:'.
1876: $ENV{'user.domain'}.':'.
1877: $ENV{'user.name'}.':nohist_email',
1878: $ENV{'user.home'});
1879:
1880: foreach my $msgid (split(/\&/, $keys)) {
1881: $msgid=&Apache::lonnet::unescape($msgid);
1.267.2.7! albertel 1882: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
! 1883: my $plain=
! 1884: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
! 1885: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
! 1886: my ($what,$url)=($1,$2);
1.221 bowersj2 1887: if ($what eq 'Error') {
1888: $error{$url}.=','.$msgid;
1889: } else {
1890: $feedback{$url}.=','.$msgid;
1891: }
1892: }
1893: }
1.211 bowersj2 1894: }
1.221 bowersj2 1895:
1.267.2.7! albertel 1896: #url's of resources that have feedbacks
1.221 bowersj2 1897: $self->{FEEDBACK} = \%feedback;
1.267.2.7! albertel 1898: #or errors
! 1899: $self->{ERROR_MSG} = \%error;
1.221 bowersj2 1900: $self->{DISCUSSION_TIME} = \%discussiontime;
1901: $self->{EMAIL_STATUS} = \%emailstatus;
1.259 raeburn 1902: $self->{LAST_READ} = \%lastreadtime;
1.221 bowersj2 1903:
1904: $self->{EMAIL_DISCUSS_GENERATED} = 1;
1905: }
1906:
1907: sub get_user_data {
1908: my $self = shift;
1909: if ($self->{RETRIEVED_USER_DATA}) { return; }
1.211 bowersj2 1910:
1.221 bowersj2 1911: # Retrieve performance data on problems
1912: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
1913: $ENV{'user.domain'},
1914: $ENV{'user.name'});
1915: $self->{STUDENT_DATA} = \%student_data;
1.133 bowersj2 1916:
1.221 bowersj2 1917: $self->{RETRIEVED_USER_DATA} = 1;
1.133 bowersj2 1918: }
1919:
1920: # Internal function: Takes a key to look up in the nav hash and implements internal
1921: # memory caching of that key.
1922: sub navhash {
1923: my $self = shift; my $key = shift;
1924: return $self->{NAV_HASH}->{$key};
1925: }
1926:
1.217 bowersj2 1927: =pod
1928:
1929: =item * B<courseMapDefined>(): Returns true if the course map is defined,
1930: false otherwise. Undefined course maps indicate an error somewhere in
1931: LON-CAPA, and you will not be able to proceed with using the navmap.
1932: See the B<NAV> screen for an example of using this.
1933:
1934: =cut
1935:
1.133 bowersj2 1936: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1937: sub courseMapDefined {
1938: my $self = shift;
1939: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1940:
1941: my $firstres = $self->navhash("map_start_$uri");
1942: my $lastres = $self->navhash("map_finish_$uri");
1943: return $firstres && $lastres;
1944: }
1945:
1946: sub getIterator {
1947: my $self = shift;
1948: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1949: shift, undef, shift);
1950: return $iterator;
1951: }
1952:
1953: # unties the hash when done
1954: sub untieHashes {
1.168 bowersj2 1955: my $self = shift;
1.170 matthew 1956: untie %{$self->{NAV_HASH}};
1957: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1958: }
1959:
1960: # Private method: Does the given resource (as a symb string) have
1961: # current discussion? Returns 0 if chat/mail data not extracted.
1962: sub hasDiscussion {
1963: my $self = shift;
1964: my $symb = shift;
1.221 bowersj2 1965:
1966: $self->generate_email_discuss_status();
1967:
1.133 bowersj2 1968: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1969:
1970: #return defined($self->{DISCUSSION_TIME}->{$symb});
1.259 raeburn 1971:
1972: # backward compatibility (bulletin boards used to be 'wrapped')
1973: my $ressymb = $symb;
1974: if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
1.266 raeburn 1975: unless ($ressymb =~ m|adm/wrapper/adm|) {
1.259 raeburn 1976: $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
1977: }
1978: }
1979:
1980: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
1981: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
1982: } else {
1.266 raeburn 1983: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
1984: return $self->{DISCUSSION_TIME}->{$ressymb} > 0; # in 1.2 will display speech bubble icons for all items with posts until marked as read (even if read in v 1.1).
1.259 raeburn 1985: }
1.133 bowersj2 1986: }
1987:
1988: # Private method: Does the given resource (as a symb string) have
1989: # current feedback? Returns the string in the feedback hash, which
1990: # will be false if it does not exist.
1991: sub getFeedback {
1992: my $self = shift;
1993: my $symb = shift;
1994:
1.221 bowersj2 1995: $self->generate_email_discuss_status();
1996:
1.133 bowersj2 1997: if (!defined($self->{FEEDBACK})) { return ""; }
1998:
1999: return $self->{FEEDBACK}->{$symb};
2000: }
2001:
2002: # Private method: Get the errors for that resource (by source).
2003: sub getErrors {
2004: my $self = shift;
2005: my $src = shift;
1.221 bowersj2 2006:
2007: $self->generate_email_discuss_status();
2008:
1.133 bowersj2 2009: if (!defined($self->{ERROR_MSG})) { return ""; }
2010: return $self->{ERROR_MSG}->{$src};
2011: }
2012:
2013: =pod
2014:
1.174 albertel 2015: =item * B<getById>(id):
2016:
2017: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2018: object for that resource. This method, or other methods that use it
2019: (as in the resource object) is the only proper way to obtain a
2020: resource object.
1.133 bowersj2 2021:
1.194 bowersj2 2022: =item * B<getBySymb>(symb):
2023:
2024: Based on the symb of the resource, get a resource object for that
2025: resource. This is one of the proper ways to get a resource object.
2026:
2027: =item * B<getMapByMapPc>(map_pc):
2028:
2029: Based on the map_pc of the resource, get a resource object for
2030: the given map. This is one of the proper ways to get a resource object.
2031:
1.133 bowersj2 2032: =cut
2033:
2034: # The strategy here is to cache the resource objects, and only construct them
2035: # as we use them. The real point is to prevent reading any more from the tied
2036: # hash then we have to, which should hopefully alleviate speed problems.
2037:
2038: sub getById {
2039: my $self = shift;
2040: my $id = shift;
2041:
2042: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2043: {
2044: return $self->{RESOURCE_CACHE}->{$id};
2045: }
2046:
2047: # resource handles inserting itself into cache.
2048: # Not clear why the quotes are necessary, but as of this
2049: # writing it doesn't work without them.
2050: return "Apache::lonnavmaps::resource"->new($self, $id);
1.132 bowersj2 2051: }
1.133 bowersj2 2052:
1.172 bowersj2 2053: sub getBySymb {
2054: my $self = shift;
2055: my $symb = shift;
1.228 albertel 2056: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1.172 bowersj2 2057: my $map = $self->getResourceByUrl($mapUrl);
2058: return $self->getById($map->map_pc() . '.' . $id);
1.194 bowersj2 2059: }
2060:
2061: sub getByMapPc {
2062: my $self = shift;
2063: my $map_pc = shift;
2064: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2065: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2066: return $self->getById($map_id);
1.172 bowersj2 2067: }
2068:
1.133 bowersj2 2069: =pod
2070:
1.174 albertel 2071: =item * B<firstResource>():
2072:
2073: Returns a resource object reference corresponding to the first
2074: resource in the navmap.
1.133 bowersj2 2075:
2076: =cut
2077:
2078: sub firstResource {
2079: my $self = shift;
2080: my $firstResource = $self->navhash('map_start_' .
2081: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2082: return $self->getById($firstResource);
1.132 bowersj2 2083: }
1.133 bowersj2 2084:
2085: =pod
2086:
1.174 albertel 2087: =item * B<finishResource>():
2088:
2089: Returns a resource object reference corresponding to the last resource
2090: in the navmap.
1.133 bowersj2 2091:
2092: =cut
2093:
2094: sub finishResource {
2095: my $self = shift;
2096: my $firstResource = $self->navhash('map_finish_' .
2097: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2098: return $self->getById($firstResource);
1.132 bowersj2 2099: }
1.133 bowersj2 2100:
2101: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2102: # the actual lookup; parmval caches the results.
2103: sub parmval {
2104: my $self = shift;
2105: my ($what,$symb)=@_;
2106: my $hashkey = $what."|||".$symb;
2107:
2108: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2109: return $self->{PARM_CACHE}->{$hashkey};
2110: }
2111:
2112: my $result = $self->parmval_real($what, $symb);
2113: $self->{PARM_CACHE}->{$hashkey} = $result;
2114: return $result;
1.132 bowersj2 2115: }
2116:
1.133 bowersj2 2117: sub parmval_real {
2118: my $self = shift;
1.219 albertel 2119: my ($what,$symb,$recurse) = @_;
1.133 bowersj2 2120:
1.221 bowersj2 2121: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2122: $self->generate_course_user_opt();
2123:
1.133 bowersj2 2124: my $cid=$ENV{'request.course.id'};
2125: my $csec=$ENV{'request.course.sec'};
2126: my $uname=$ENV{'user.name'};
2127: my $udom=$ENV{'user.domain'};
2128:
2129: unless ($symb) { return ''; }
2130: my $result='';
2131:
1.226 www 2132: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
1.133 bowersj2 2133:
2134: # ----------------------------------------------------- Cascading lookup scheme
2135: my $rwhat=$what;
2136: $what=~s/^parameter\_//;
2137: $what=~s/\_/\./;
2138:
2139: my $symbparm=$symb.'.'.$what;
2140: my $mapparm=$mapname.'___(all).'.$what;
2141: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2142:
2143: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2144: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2145: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2146:
2147: my $courselevel= $usercourseprefix.'.'.$what;
2148: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2149: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2150:
2151: my $useropt = $self->{USER_OPT};
2152: my $courseopt = $self->{COURSE_OPT};
2153: my $parmhash = $self->{PARM_HASH};
2154:
2155: # ---------------------------------------------------------- first, check user
2156: if ($uname and defined($useropt)) {
2157: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2158: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2159: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2160: }
2161:
2162: # ------------------------------------------------------- second, check course
2163: if ($csec and defined($courseopt)) {
2164: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2165: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2166: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2167: }
2168:
2169: if (defined($courseopt)) {
2170: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2171: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2172: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2173: }
2174:
2175: # ----------------------------------------------------- third, check map parms
2176:
2177: my $thisparm=$$parmhash{$symbparm};
2178: if (defined($thisparm)) { return $thisparm; }
2179:
2180: # ----------------------------------------------------- fourth , check default
2181:
1.246 albertel 2182: my $meta_rwhat=$rwhat;
2183: $meta_rwhat=~s/\./_/g;
2184: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2185: if (defined($default)) { return $default}
2186: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
1.133 bowersj2 2187: if (defined($default)) { return $default}
2188:
2189: # --------------------------------------------------- fifth , cascade up parts
2190:
2191: my ($space,@qualifier)=split(/\./,$rwhat);
2192: my $qualifier=join('.',@qualifier);
2193: unless ($space eq '0') {
1.160 albertel 2194: my @parts=split(/_/,$space);
2195: my $id=pop(@parts);
2196: my $part=join('_',@parts);
2197: if ($part eq '') { $part='0'; }
1.219 albertel 2198: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
1.160 albertel 2199: if (defined($partgeneral)) { return $partgeneral; }
1.133 bowersj2 2200: }
1.219 albertel 2201: if ($recurse) { return undef; }
2202: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2203: if (defined($pack_def)) { return $pack_def; }
1.133 bowersj2 2204: return '';
1.145 bowersj2 2205: }
2206:
1.174 albertel 2207: =pod
1.145 bowersj2 2208:
1.174 albertel 2209: =item * B<getResourceByUrl>(url):
1.145 bowersj2 2210:
1.174 albertel 2211: Retrieves a resource object by URL of the resource. If passed a
2212: resource object, it will simply return it, so it is safe to use this
2213: method in code like "$res = $navmap->getResourceByUrl($res)", if
2214: you're not sure if $res is already an object, or just a URL. If the
2215: resource appears multiple times in the course, only the first instance
2216: will be returned. As a result, this is probably useful only for maps.
2217:
2218: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2219:
2220: The map is a specification of a map to retreive the resources from,
2221: either as a url or as an object. The filterFunc is a reference to a
2222: function that takes a resource object as its one argument and returns
2223: true if the resource should be included, or false if it should not
2224: be. If recursive is true, the map will be recursively examined,
2225: otherwise it will not be. If bailout is true, the function will return
2226: as soon as it finds a resource, if false it will finish. By default,
2227: the map is the top-level map of the course, filterFunc is a function
2228: that always returns 1, recursive is true, bailout is false. The
2229: resources will be returned in a list containing the resource objects
2230: for the corresponding resources, with B<no structure information> in
2231: the list; regardless of branching, recursion, etc., it will be a flat
2232: list.
2233:
2234: Thus, this is suitable for cases where you don't want the structure,
2235: just a list of all resources. It is also suitable for finding out how
2236: many resources match a given description; for this use, if all you
2237: want to know is if I<any> resources match the description, the bailout
2238: parameter will allow you to avoid potentially expensive enumeration of
2239: all matching resources.
1.145 bowersj2 2240:
1.256 albertel 2241: =item * B<hasResource>(map, filterFunc, recursive):
1.145 bowersj2 2242:
1.174 albertel 2243: Convience method for
1.146 bowersj2 2244:
2245: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2246:
1.174 albertel 2247: which will tell whether the map has resources matching the description
2248: in the filter function.
1.146 bowersj2 2249:
1.145 bowersj2 2250: =cut
2251:
2252: sub getResourceByUrl {
2253: my $self = shift;
2254: my $resUrl = shift;
2255:
2256: if (ref($resUrl)) { return $resUrl; }
2257:
2258: $resUrl = &Apache::lonnet::clutter($resUrl);
2259: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2260: if ($resId =~ /,/) {
2261: $resId = (split (/,/, $resId))[0];
2262: }
2263: if (!$resId) { return ''; }
2264: return $self->getById($resId);
2265: }
2266:
2267: sub retrieveResources {
2268: my $self = shift;
2269: my $map = shift;
2270: my $filterFunc = shift;
2271: if (!defined ($filterFunc)) {
2272: $filterFunc = sub {return 1;};
2273: }
2274: my $recursive = shift;
2275: if (!defined($recursive)) { $recursive = 1; }
2276: my $bailout = shift;
2277: if (!defined($bailout)) { $bailout = 0; }
2278:
2279: # Create the necessary iterator.
2280: if (!ref($map)) { # assume it's a url of a map.
1.172 bowersj2 2281: $map = $self->getResourceByUrl($map);
1.145 bowersj2 2282: }
2283:
1.213 bowersj2 2284: # If nothing was passed, assume top-level map
2285: if (!$map) {
2286: $map = $self->getById('0.0');
2287: }
2288:
1.145 bowersj2 2289: # Check the map's validity.
1.213 bowersj2 2290: if (!$map->is_map()) {
1.145 bowersj2 2291: # Oh, to throw an exception.... how I'd love that!
2292: return ();
2293: }
2294:
1.146 bowersj2 2295: # Get an iterator.
2296: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1.215 bowersj2 2297: undef, $recursive);
1.146 bowersj2 2298:
2299: my @resources = ();
2300:
2301: # Run down the iterator and collect the resources.
1.222 bowersj2 2302: my $curRes;
2303:
2304: while ($curRes = $it->next()) {
1.146 bowersj2 2305: if (ref($curRes)) {
2306: if (!&$filterFunc($curRes)) {
2307: next;
2308: }
2309:
2310: push @resources, $curRes;
2311:
2312: if ($bailout) {
2313: return @resources;
2314: }
2315: }
2316:
2317: }
2318:
2319: return @resources;
2320: }
2321:
2322: sub hasResource {
2323: my $self = shift;
2324: my $map = shift;
2325: my $filterFunc = shift;
2326: my $recursive = shift;
2327:
2328: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1.133 bowersj2 2329: }
1.51 bowersj2 2330:
2331: 1;
2332:
2333: package Apache::lonnavmaps::iterator;
2334:
2335: =pod
2336:
2337: =back
2338:
1.174 albertel 2339: =head1 Object: navmap Iterator
1.51 bowersj2 2340:
1.174 albertel 2341: An I<iterator> encapsulates the logic required to traverse a data
2342: structure. navmap uses an iterator to traverse the course map
2343: according to the criteria you wish to use.
2344:
2345: To obtain an iterator, call the B<getIterator>() function of a
2346: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2347: directly.) This will return a reference to the iterator:
1.51 bowersj2 2348:
2349: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2350:
2351: To get the next thing from the iterator, call B<next>:
2352:
2353: C<my $nextThing = $resourceIterator-E<gt>next()>
2354:
2355: getIterator behaves as follows:
2356:
2357: =over 4
2358:
1.174 albertel 2359: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2360:
2361: All parameters are optional. firstResource is a resource reference
2362: corresponding to where the iterator should start. It defaults to
2363: navmap->firstResource() for the corresponding nav map. finishResource
2364: corresponds to where you want the iterator to end, defaulting to
2365: navmap->finishResource(). filterHash is a hash used as a set
2366: containing strings representing the resource IDs, defaulting to
2367: empty. Condition is a 1 or 0 that sets what to do with the filter
1.205 bowersj2 2368: hash: If a 0, then only resources that exist IN the filterHash will be
1.174 albertel 2369: recursed on. If it is a 1, only resources NOT in the filterHash will
2370: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2371: false (default), the iterator will only return the first level of map
2372: that is not just a single, 'redirecting' map. If true, the iterator
2373: will return all information, starting with the top-level map,
2374: regardless of content. returnTopMap, if true (default false), will
2375: cause the iterator to return the top-level map object (resource 0.0)
2376: before anything else.
2377:
2378: Thus, by default, only top-level resources will be shown. Change the
2379: condition to a 1 without changing the hash, and all resources will be
2380: shown. Changing the condition to 1 and including some values in the
2381: hash will allow you to selectively suppress parts of the navmap, while
2382: leaving it on 0 and adding things to the hash will allow you to
2383: selectively add parts of the nav map. See the handler code for
2384: examples.
2385:
2386: The iterator will return either a reference to a resource object, or a
2387: token representing something in the map, such as the beginning of a
2388: new branch. The possible tokens are:
2389:
2390: =over 4
1.51 bowersj2 2391:
1.222 bowersj2 2392: =item * B<END_ITERATOR>:
2393:
2394: The iterator has returned all that it's going to. Further calls to the
2395: iterator will just produce more of these. This is a "false" value, and
2396: is the only false value the iterator which will be returned, so it can
2397: be used as a loop sentinel.
2398:
1.217 bowersj2 2399: =item * B<BEGIN_MAP>:
1.51 bowersj2 2400:
1.174 albertel 2401: A new map is being recursed into. This is returned I<after> the map
2402: resource itself is returned.
1.51 bowersj2 2403:
1.217 bowersj2 2404: =item * B<END_MAP>:
1.174 albertel 2405:
2406: The map is now done.
1.51 bowersj2 2407:
1.217 bowersj2 2408: =item * B<BEGIN_BRANCH>:
1.70 bowersj2 2409:
1.174 albertel 2410: A branch is now starting. The next resource returned will be the first
2411: in that branch.
1.70 bowersj2 2412:
1.217 bowersj2 2413: =item * B<END_BRANCH>:
1.70 bowersj2 2414:
1.174 albertel 2415: The branch is now done.
1.51 bowersj2 2416:
2417: =back
2418:
1.174 albertel 2419: The tokens are retreivable via methods on the iterator object, i.e.,
2420: $iterator->END_MAP.
1.70 bowersj2 2421:
1.174 albertel 2422: Maps can contain empty resources. The iterator will automatically skip
2423: over such resources, but will still treat the structure
2424: correctly. Thus, a complicated map with several branches, but
2425: consisting entirely of empty resources except for one beginning or
2426: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2427: but only one resource will be returned.
1.116 bowersj2 2428:
1.242 matthew 2429: =back
2430:
1.222 bowersj2 2431: =head2 Normal Usage
2432:
2433: Normal usage of the iterator object is to do the following:
2434:
2435: my $it = $navmap->getIterator([your params here]);
2436: my $curRes;
2437: while ($curRes = $it->next()) {
2438: [your logic here]
2439: }
2440:
2441: Note that inside of the loop, it's frequently useful to check if
2442: "$curRes" is a reference or not with the reference function; only
2443: resource objects will be references, and any non-references will
2444: be the tokens described above.
2445:
2446: Also note there is some old code floating around that trys to track
2447: the depth of the iterator to see when it's done; do not copy that
2448: code. It is difficult to get right and harder to understand then
2449: this. They should be migrated to this new style.
1.51 bowersj2 2450:
2451: =cut
2452:
2453: # Here are the tokens for the iterator:
2454:
1.222 bowersj2 2455: sub END_ITERATOR { return 0; }
1.51 bowersj2 2456: sub BEGIN_MAP { return 1; } # begining of a new map
2457: sub END_MAP { return 2; } # end of the map
2458: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2459: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 2460: sub FORWARD { return 1; } # go forward
2461: sub BACKWARD { return 2; }
1.51 bowersj2 2462:
1.96 bowersj2 2463: sub min {
2464: (my $a, my $b) = @_;
2465: if ($a < $b) { return $a; } else { return $b; }
2466: }
2467:
1.94 bowersj2 2468: sub new {
2469: # magic invocation to create a class instance
2470: my $proto = shift;
2471: my $class = ref($proto) || $proto;
2472: my $self = {};
2473:
2474: $self->{NAV_MAP} = shift;
2475: return undef unless ($self->{NAV_MAP});
2476:
2477: # Handle the parameters
2478: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2479: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2480:
2481: # If the given resources are just the ID of the resource, get the
2482: # objects
2483: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2484: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2485: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2486: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2487:
2488: $self->{FILTER} = shift;
2489:
2490: # A hash, used as a set, of resource already seen
2491: $self->{ALREADY_SEEN} = shift;
2492: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2493: $self->{CONDITION} = shift;
2494:
1.116 bowersj2 2495: # Do we want to automatically follow "redirection" maps?
2496: $self->{FORCE_TOP} = shift;
2497:
1.162 bowersj2 2498: # Do we want to return the top-level map object (resource 0.0)?
2499: $self->{RETURN_0} = shift;
2500: # have we done that yet?
2501: $self->{HAVE_RETURNED_0} = 0;
2502:
1.94 bowersj2 2503: # Now, we need to pre-process the map, by walking forward and backward
2504: # over the parts of the map we're going to look at.
1.96 bowersj2 2505:
1.97 bowersj2 2506: # The processing steps are exactly the same, except for a few small
2507: # changes, so I bundle those up in the following list of two elements:
2508: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2509: # first_resource).
2510: # This prevents writing nearly-identical code twice.
2511: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2512: 'FIRST_RESOURCE'],
2513: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2514: 'FINISH_RESOURCE'] );
2515:
1.98 bowersj2 2516: my $maxDepth = 0; # tracks max depth
2517:
1.116 bowersj2 2518: # If there is only one resource in this map, and it's a map, we
2519: # want to remember that, so the user can ask for the first map
2520: # that isn't just a redirector.
2521: my $resource; my $resourceCount = 0;
2522:
1.209 bowersj2 2523: # Documentation on this algorithm can be found in the CVS repository at
2524: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2525: # in that file.
1.107 bowersj2 2526: # **1**
2527:
1.97 bowersj2 2528: foreach my $pass (@iterations) {
2529: my $direction = $pass->[0];
2530: my $valName = $pass->[1];
2531: my $nextResourceMethod = $pass->[2];
2532: my $firstResourceName = $pass->[3];
2533:
2534: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2535: $self->{FIRST_RESOURCE},
2536: $self->{FINISH_RESOURCE},
2537: {}, undef, 0, $direction);
1.96 bowersj2 2538:
1.97 bowersj2 2539: # prime the recursion
2540: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.222 bowersj2 2541: $iterator->next();
1.97 bowersj2 2542: my $curRes = $iterator->next();
1.222 bowersj2 2543: my $depth = 1;
2544: while ($depth > 0) {
2545: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2546: if ($curRes == $iterator->END_MAP()) { $depth--; }
2547:
1.97 bowersj2 2548: if (ref($curRes)) {
1.116 bowersj2 2549: # If there's only one resource, this will save it
1.117 bowersj2 2550: # we have to filter empty resources from consideration here,
2551: # or even "empty", redirecting maps have two (start & finish)
2552: # or three (start, finish, plus redirector)
2553: if($direction == FORWARD && $curRes->src()) {
2554: $resource = $curRes; $resourceCount++;
2555: }
1.97 bowersj2 2556: my $resultingVal = $curRes->{DATA}->{$valName};
2557: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 2558: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 2559:
1.116 bowersj2 2560: if ($nextCount == 1) { # **3**
1.97 bowersj2 2561: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2562: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2563: }
2564:
1.116 bowersj2 2565: if ($nextCount > 1) { # **4**
1.97 bowersj2 2566: foreach my $res (@{$nextResources}) {
2567: my $current = $res->{DATA}->{$valName} || 999999999;
2568: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2569: }
2570: }
2571: }
1.96 bowersj2 2572:
1.107 bowersj2 2573: # Assign the final val (**2**)
1.97 bowersj2 2574: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 2575: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2576: $curRes->{DATA}->{BOT_UP_VAL});
2577:
2578: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2579: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1.190 bowersj2 2580: }
1.222 bowersj2 2581:
2582: $curRes = $iterator->next();
1.96 bowersj2 2583: }
2584: }
1.94 bowersj2 2585:
1.116 bowersj2 2586: # Check: Was this only one resource, a map?
1.255 albertel 2587: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
1.116 bowersj2 2588: my $firstResource = $resource->map_start();
2589: my $finishResource = $resource->map_finish();
2590: return
2591: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2592: $finishResource, $self->{FILTER},
2593: $self->{ALREADY_SEEN},
2594: $self->{CONDITION}, 0);
2595:
2596: }
2597:
1.98 bowersj2 2598: # Set up some bookkeeping information.
2599: $self->{CURRENT_DEPTH} = 0;
2600: $self->{MAX_DEPTH} = $maxDepth;
2601: $self->{STACK} = [];
2602: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1.222 bowersj2 2603: $self->{FINISHED} = 0; # When true, the iterator has finished
1.98 bowersj2 2604:
2605: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2606: push @{$self->{STACK}}, [];
2607: }
2608:
1.107 bowersj2 2609: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 2610: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2611: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2612:
2613: bless ($self);
2614:
2615: return $self;
2616: }
2617:
2618: sub next {
2619: my $self = shift;
1.256 albertel 2620: my $closeAllPages=shift;
1.222 bowersj2 2621: if ($self->{FINISHED}) {
2622: return END_ITERATOR();
2623: }
2624:
1.162 bowersj2 2625: # If we want to return the top-level map object, and haven't yet,
2626: # do so.
2627: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2628: $self->{HAVE_RETURNED_0} = 1;
2629: return $self->{NAV_MAP}->getById('0.0');
2630: }
1.98 bowersj2 2631:
2632: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2633: # grab the next from the recursive iterator
1.256 albertel 2634: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
1.98 bowersj2 2635:
2636: # is it a begin or end map? If so, update the depth
2637: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2638: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2639:
2640: # Are we back at depth 0? If so, stop recursing
2641: if ($self->{RECURSIVE_DEPTH} == 0) {
2642: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2643: }
2644:
2645: return $next;
2646: }
2647:
2648: if (defined($self->{FORCE_NEXT})) {
2649: my $tmp = $self->{FORCE_NEXT};
2650: $self->{FORCE_NEXT} = undef;
2651: return $tmp;
2652: }
2653:
2654: # Have we not yet begun? If not, return BEGIN_MAP and
2655: # remember we've started.
2656: if ( !$self->{STARTED} ) {
2657: $self->{STARTED} = 1;
2658: return $self->BEGIN_MAP();
2659: }
2660:
2661: # Here's the guts of the iterator.
2662:
2663: # Find the next resource, if any.
2664: my $found = 0;
2665: my $i = $self->{MAX_DEPTH};
2666: my $newDepth;
2667: my $here;
2668: while ( $i >= 0 && !$found ) {
1.107 bowersj2 2669: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2670: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 2671: $found = 1;
2672: $newDepth = $i;
2673: }
2674: $i--;
2675: }
2676:
2677: # If we still didn't find anything, we're done.
2678: if ( !$found ) {
2679: # We need to get back down to the correct branch depth
2680: if ( $self->{CURRENT_DEPTH} > 0 ) {
2681: $self->{CURRENT_DEPTH}--;
2682: return END_BRANCH();
2683: } else {
1.222 bowersj2 2684: $self->{FINISHED} = 1;
1.98 bowersj2 2685: return END_MAP();
2686: }
2687: }
2688:
1.104 bowersj2 2689: # If this is not a resource, it must be an END_BRANCH marker we want
2690: # to return directly.
1.107 bowersj2 2691: if (!ref($here)) { # **8**
1.104 bowersj2 2692: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2693: $self->{CURRENT_DEPTH}--;
2694: return $here;
2695: }
2696: }
2697:
2698: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2699: $self->{HERE} = $here;
2700:
1.98 bowersj2 2701: # Get to the right level
2702: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2703: push @{$self->{STACK}->[$newDepth]}, $here;
2704: $self->{CURRENT_DEPTH}--;
2705: return END_BRANCH();
2706: }
2707: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2708: push @{$self->{STACK}->[$newDepth]}, $here;
2709: $self->{CURRENT_DEPTH}++;
2710: return BEGIN_BRANCH();
2711: }
2712:
2713: # If we made it here, we have the next resource, and we're at the
2714: # right branch level. So let's examine the resource for where
2715: # we can get to from here.
2716:
2717: # So we need to look at all the resources we can get to from here,
2718: # categorize them if we haven't seen them, remember if we have a new
2719: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 2720: my $maxDepthAdded = -1;
2721:
1.98 bowersj2 2722: for (@$nextUnfiltered) {
2723: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 2724: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2725: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 2726: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 2727: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 2728: }
2729: }
1.104 bowersj2 2730:
2731: # Is this the end of a branch? If so, all of the resources examined above
2732: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2733: # marker onto the stack so we don't forget.
2734: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2735: # BC branch and gets to C, it will see F as the only next resource, but it's
2736: # one level lower. Thus, this is the end of the branch, since there are no
2737: # more resources added to this level or above.
1.111 bowersj2 2738: # We don't do this if the examined resource is the finish resource,
2739: # because the condition given above is true, but the "END_MAP" will
2740: # take care of things and we should already be at depth 0.
1.104 bowersj2 2741: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 2742: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 2743: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2744: }
2745:
1.98 bowersj2 2746: # That ends the main iterator logic. Now, do we want to recurse
2747: # down this map (if this resource is a map)?
1.256 albertel 2748: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
1.98 bowersj2 2749: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2750: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2751: my $firstResource = $self->{HERE}->map_start();
2752: my $finishResource = $self->{HERE}->map_finish();
2753:
2754: $self->{RECURSIVE_ITERATOR} =
2755: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2756: $finishResource, $self->{FILTER},
2757: $self->{ALREADY_SEEN}, $self->{CONDITION});
2758: }
2759:
1.116 bowersj2 2760: # If this is a blank resource, don't actually return it.
1.117 bowersj2 2761: # Should you ever find you need it, make sure to add an option to the code
2762: # that you can use; other things depend on this behavior.
1.138 bowersj2 2763: my $browsePriv = $self->{HERE}->browsePriv();
2764: if (!$self->{HERE}->src() ||
2765: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.256 albertel 2766: return $self->next($closeAllPages);
1.116 bowersj2 2767: }
2768:
1.98 bowersj2 2769: return $self->{HERE};
2770:
2771: }
2772:
2773: =pod
2774:
1.174 albertel 2775: The other method available on the iterator is B<getStack>, which
2776: returns an array populated with the current 'stack' of maps, as
2777: references to the resource objects. Example: This is useful when
2778: making the navigation map, as we need to check whether we are under a
2779: page map to see if we need to link directly to the resource, or to the
2780: page. The first elements in the array will correspond to the top of
2781: the stack (most inclusive map).
1.98 bowersj2 2782:
2783: =cut
2784:
2785: sub getStack {
2786: my $self=shift;
2787:
2788: my @stack;
2789:
2790: $self->populateStack(\@stack);
2791:
2792: return \@stack;
2793: }
2794:
2795: # Private method: Calls the iterators recursively to populate the stack.
2796: sub populateStack {
2797: my $self=shift;
2798: my $stack = shift;
2799:
2800: push @$stack, $self->{HERE} if ($self->{HERE});
2801:
2802: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2803: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2804: }
1.94 bowersj2 2805: }
2806:
2807: 1;
2808:
2809: package Apache::lonnavmaps::DFSiterator;
2810:
1.100 bowersj2 2811: # Not documented in the perldoc: This is a simple iterator that just walks
2812: # through the nav map and presents the resources in a depth-first search
2813: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2814: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2815: # useful for pre-processing of some kind, and is in fact used by the main
2816: # iterator that way, but that's about it.
2817: # One could imagine merging this into the init routine of the main iterator,
1.251 www 2818: # but this might as well be left separate, since it is possible some other
1.100 bowersj2 2819: # use might be found for it. - Jeremy
1.94 bowersj2 2820:
1.117 bowersj2 2821: # Unlike the main iterator, this DOES return all resources, even blank ones.
2822: # The main iterator needs them to correctly preprocess the map.
2823:
1.94 bowersj2 2824: sub BEGIN_MAP { return 1; } # begining of a new map
2825: sub END_MAP { return 2; } # end of the map
2826: sub FORWARD { return 1; } # go forward
2827: sub BACKWARD { return 2; }
2828:
1.100 bowersj2 2829: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2830: # filter hash ref (or undef), already seen hash or undef, condition
2831: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 2832: sub new {
2833: # magic invocation to create a class instance
2834: my $proto = shift;
2835: my $class = ref($proto) || $proto;
2836: my $self = {};
2837:
2838: $self->{NAV_MAP} = shift;
2839: return undef unless ($self->{NAV_MAP});
2840:
2841: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2842: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2843:
2844: # If the given resources are just the ID of the resource, get the
2845: # objects
2846: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2847: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2848: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2849: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2850:
2851: $self->{FILTER} = shift;
2852:
2853: # A hash, used as a set, of resource already seen
2854: $self->{ALREADY_SEEN} = shift;
1.140 bowersj2 2855: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 2856: $self->{CONDITION} = shift;
1.89 bowersj2 2857: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 2858:
1.100 bowersj2 2859: # Flag: Have we started yet?
1.51 bowersj2 2860: $self->{STARTED} = 0;
2861:
2862: # Should we continue calling the recursive iterator, if any?
2863: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2864: # The recursive iterator, if any
2865: $self->{RECURSIVE_ITERATOR} = undef;
2866: # Are we recursing on a map, or a branch?
2867: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2868: # And the count of how deep it is, so that this iterator can keep track of
2869: # when to pick back up again.
2870: $self->{RECURSIVE_DEPTH} = 0;
2871:
2872: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 2873: $self->{STACK} = [];
1.51 bowersj2 2874:
2875: # Start with the first resource
1.89 bowersj2 2876: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 2877: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 2878: } else {
1.100 bowersj2 2879: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 2880: }
1.51 bowersj2 2881:
2882: bless($self);
2883: return $self;
2884: }
2885:
2886: sub next {
2887: my $self = shift;
2888:
2889: # Are we using a recursive iterator? If so, pull from that and
2890: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 2891: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 2892: # grab the next from the recursive iterator
2893: my $next = $self->{RECURSIVE_ITERATOR}->next();
2894:
2895: # is it a begin or end map? Update depth if so
2896: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2897: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2898:
2899: # Are we back at depth 0? If so, stop recursing.
2900: if ($self->{RECURSIVE_DEPTH} == 0) {
2901: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2902: }
2903:
2904: return $next;
2905: }
2906:
2907: # Is there a current resource to grab? If not, then return
1.100 bowersj2 2908: # END_MAP, which will end the iterator.
2909: if (scalar(@{$self->{STACK}}) == 0) {
2910: return $self->END_MAP();
1.51 bowersj2 2911: }
2912:
2913: # Have we not yet begun? If not, return BEGIN_MAP and
2914: # remember that we've started.
2915: if ( !$self->{STARTED} ) {
2916: $self->{STARTED} = 1;
2917: return $self->BEGIN_MAP;
2918: }
2919:
2920: # Get the next resource in the branch
1.100 bowersj2 2921: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 2922:
1.100 bowersj2 2923: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 2924: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2925:
2926: # Get the next possible resources
1.90 bowersj2 2927: my $nextUnfiltered;
1.89 bowersj2 2928: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 2929: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 2930: } else {
1.90 bowersj2 2931: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 2932: }
1.51 bowersj2 2933: my $next = [];
2934:
2935: # filter the next possibilities to remove things we've
1.100 bowersj2 2936: # already seen.
1.51 bowersj2 2937: foreach (@$nextUnfiltered) {
1.52 bowersj2 2938: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2939: push @$next, $_;
2940: }
1.51 bowersj2 2941: }
2942:
2943: while (@$next) {
1.100 bowersj2 2944: # copy the next possibilities over to the stack
2945: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 2946: }
2947:
2948: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 2949: if ($self->{HERE}->is_map() &&
1.63 bowersj2 2950: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 2951: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2952: my $firstResource = $self->{HERE}->map_start();
2953: my $finishResource = $self->{HERE}->map_finish();
2954:
2955: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 2956: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 2957: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 2958: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 2959: }
2960:
2961: return $self->{HERE};
1.190 bowersj2 2962: }
2963:
2964: # Identical to the full iterator methods of the same name. Hate to copy/paste
2965: # but I also hate to "inherit" either iterator from the other.
2966:
2967: sub getStack {
2968: my $self=shift;
2969:
2970: my @stack;
2971:
2972: $self->populateStack(\@stack);
2973:
2974: return \@stack;
2975: }
2976:
2977: # Private method: Calls the iterators recursively to populate the stack.
2978: sub populateStack {
2979: my $self=shift;
2980: my $stack = shift;
2981:
2982: push @$stack, $self->{HERE} if ($self->{HERE});
2983:
2984: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2985: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2986: }
1.51 bowersj2 2987: }
2988:
1.1 www 2989: 1;
1.2 www 2990:
1.51 bowersj2 2991: package Apache::lonnavmaps::resource;
2992:
2993: use Apache::lonnet;
2994:
2995: =pod
2996:
1.217 bowersj2 2997: =head1 Object: resource
1.51 bowersj2 2998:
1.217 bowersj2 2999: X<resource, navmap object>
1.174 albertel 3000: A resource object encapsulates a resource in a resource map, allowing
3001: easy manipulation of the resource, querying the properties of the
3002: resource (including user properties), and represents a reference that
3003: can be used as the canonical representation of the resource by
3004: lonnavmap clients like renderers.
3005:
3006: A resource only makes sense in the context of a navmap, as some of the
3007: data is stored in the navmap object.
3008:
3009: You will probably never need to instantiate this object directly. Use
3010: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3011: starting resource.
1.51 bowersj2 3012:
1.188 bowersj2 3013: Resource objects respect the parameter_hiddenparts, which suppresses
3014: various parts according to the wishes of the map author. As of this
3015: writing, there is no way to override this parameter, and suppressed
3016: parts will never be returned, nor will their response types or ids be
3017: stored.
3018:
1.217 bowersj2 3019: =head2 Overview
1.51 bowersj2 3020:
1.217 bowersj2 3021: A B<Resource> is the most granular type of object in LON-CAPA that can
3022: be included in a course. It can either be a particular resource, like
3023: an HTML page, external resource, problem, etc., or it can be a
3024: container sequence, such as a "page" or a "map".
3025:
3026: To see a sequence from the user's point of view, please see the
3027: B<Creating a Course: Maps and Sequences> chapter of the Author's
3028: Manual.
3029:
3030: A Resource Object, once obtained from a navmap object via a B<getBy*>
3031: method of the navmap, or from an iterator, allows you to query
3032: information about that resource.
3033:
3034: Generally, you do not ever want to create a resource object yourself,
3035: so creation has been left undocumented. Always retrieve resources
3036: from navmap objects.
3037:
3038: =head3 Identifying Resources
3039:
3040: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3041: unique to that resource for a given course. X<resource ID, in big hash>
3042: The Resource ID has the form #.#, where the first number is the same
3043: for every resource in a map, and the second is unique. For instance,
3044: for a course laid out like this:
3045:
3046: * Problem 1
3047: * Map
3048: * Resource 2
3049: * Resource 3
3050:
3051: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3052: C<Resource 3> will share a first number. The second number may end up
3053: re-used between the two groups.
3054:
3055: The resource ID is only used in the big hash, but can be used in the
3056: context of a course to identify a resource easily. (For instance, the
3057: printing system uses it to record which resources from a sequence you
3058: wish to print.)
3059:
3060: X<symb> X<resource, symb>
3061: All resources also have B<symb>s, which uniquely identify a resource
3062: in a course. Many internal LON-CAPA functions expect a symb. A symb
3063: carries along with it the URL of the resource, and the map it appears
3064: in. Symbs are much larger then resource IDs.
1.51 bowersj2 3065:
3066: =cut
3067:
3068: sub new {
3069: # magic invocation to create a class instance
3070: my $proto = shift;
3071: my $class = ref($proto) || $proto;
3072: my $self = {};
3073:
3074: $self->{NAV_MAP} = shift;
3075: $self->{ID} = shift;
3076:
3077: # Store this new resource in the parent nav map's cache.
3078: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 3079: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 3080:
3081: # A hash that can be used by two-pass algorithms to store data
3082: # about this resource in. Not used by the resource object
3083: # directly.
3084: $self->{DATA} = {};
3085:
3086: bless($self);
3087:
3088: return $self;
3089: }
3090:
1.70 bowersj2 3091: # private function: simplify the NAV_HASH lookups we keep doing
3092: # pass the name, and to automatically append my ID, pass a true val on the
3093: # second param
3094: sub navHash {
3095: my $self = shift;
3096: my $param = shift;
3097: my $id = shift;
1.115 bowersj2 3098: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 3099: }
3100:
1.51 bowersj2 3101: =pod
3102:
1.217 bowersj2 3103: =head2 Methods
1.70 bowersj2 3104:
1.217 bowersj2 3105: Once you have a resource object, here's what you can do with it:
3106:
3107: =head3 Attribute Retrieval
3108:
3109: Every resource has certain attributes that can be retrieved and used:
1.70 bowersj2 3110:
3111: =over 4
3112:
1.217 bowersj2 3113: =item * B<ID>: Every resource has an ID that is unique for that
3114: resource in the course it is in. The ID is actually in the hash
3115: representing the resource, so for a resource object $res, obtain
3116: it via C<$res->{ID}).
3117:
1.174 albertel 3118: =item * B<compTitle>:
3119:
3120: Returns a "composite title", that is equal to $res->title() if the
3121: resource has a title, and is otherwise the last part of the URL (e.g.,
3122: "problem.problem").
3123:
3124: =item * B<ext>:
3125:
3126: Returns true if the resource is external.
3127:
3128: =item * B<kind>:
3129:
3130: Returns the kind of the resource from the compiled nav map.
3131:
3132: =item * B<randomout>:
1.106 bowersj2 3133:
1.174 albertel 3134: Returns true if this resource was chosen to NOT be shown to the user
3135: by the random map selection feature. In other words, this is usually
3136: false.
1.70 bowersj2 3137:
1.174 albertel 3138: =item * B<randompick>:
1.70 bowersj2 3139:
1.174 albertel 3140: Returns true for a map if the randompick feature is being used on the
3141: map. (?)
1.70 bowersj2 3142:
1.174 albertel 3143: =item * B<src>:
1.51 bowersj2 3144:
1.174 albertel 3145: Returns the source for the resource.
1.70 bowersj2 3146:
1.174 albertel 3147: =item * B<symb>:
1.70 bowersj2 3148:
1.174 albertel 3149: Returns the symb for the resource.
1.70 bowersj2 3150:
1.174 albertel 3151: =item * B<title>:
1.70 bowersj2 3152:
1.174 albertel 3153: Returns the title of the resource.
3154:
1.51 bowersj2 3155: =back
3156:
3157: =cut
3158:
3159: # These info functions can be used directly, as they don't return
3160: # resource information.
1.85 bowersj2 3161: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 3162: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 3163: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.217 bowersj2 3164: # considered private and undocumented
1.51 bowersj2 3165: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3166: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 3167: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3168: sub randompick {
3169: my $self = shift;
3170: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3171: '.0.parameter_randompick'};
3172: }
1.51 bowersj2 3173: sub src {
3174: my $self=shift;
3175: return $self->navHash("src_", 1);
3176: }
3177: sub symb {
3178: my $self=shift;
3179: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3180: my $symbSrc = &Apache::lonnet::declutter($self->src());
1.223 albertel 3181: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
1.51 bowersj2 3182: . '___' . $second . '___' . $symbSrc;
1.223 albertel 3183: return &Apache::lonnet::symbclean($symb);
1.51 bowersj2 3184: }
1.213 bowersj2 3185: sub title {
3186: my $self=shift;
3187: if ($self->{ID} eq '0.0') {
3188: # If this is the top-level map, return the title of the course
3189: # since this map can not be titled otherwise.
3190: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3191: }
3192: return $self->navHash("title_", 1); }
1.217 bowersj2 3193: # considered private and undocumented
1.70 bowersj2 3194: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 3195: sub compTitle {
3196: my $self = shift;
3197: my $title = $self->title();
1.176 www 3198: $title=~s/\&colon\;/\:/gs;
1.106 bowersj2 3199: if (!$title) {
3200: $title = $self->src();
3201: $title = substr($title, rindex($title, '/') + 1);
3202: }
3203: return $title;
3204: }
1.70 bowersj2 3205: =pod
3206:
3207: B<Predicate Testing the Resource>
3208:
3209: These methods are shortcuts to deciding if a given resource has a given property.
3210:
3211: =over 4
3212:
1.174 albertel 3213: =item * B<is_map>:
3214:
3215: Returns true if the resource is a map type.
3216:
3217: =item * B<is_problem>:
1.70 bowersj2 3218:
1.174 albertel 3219: Returns true if the resource is a problem type, false
3220: otherwise. (Looks at the extension on the src field; might need more
3221: to work correctly.)
1.70 bowersj2 3222:
1.174 albertel 3223: =item * B<is_page>:
1.70 bowersj2 3224:
1.174 albertel 3225: Returns true if the resource is a page.
3226:
3227: =item * B<is_sequence>:
3228:
3229: Returns true if the resource is a sequence.
1.70 bowersj2 3230:
3231: =back
3232:
3233: =cut
3234:
1.256 albertel 3235: sub hasResource {
3236: my $self = shift;
3237: return $self->{NAV_MAP}->hasResource(@_);
3238: }
3239:
3240: sub retrieveResources {
3241: my $self = shift;
3242: return $self->{NAV_MAP}->retrieveResources(@_);
3243: }
1.70 bowersj2 3244:
3245: sub is_html {
1.51 bowersj2 3246: my $self=shift;
3247: my $src = $self->src();
1.70 bowersj2 3248: return ($src =~ /html$/);
1.51 bowersj2 3249: }
1.70 bowersj2 3250: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3251: sub is_page {
1.51 bowersj2 3252: my $self=shift;
3253: my $src = $self->src();
1.205 bowersj2 3254: return $self->navHash("is_map_", 1) &&
3255: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
1.51 bowersj2 3256: }
1.70 bowersj2 3257: sub is_problem {
1.51 bowersj2 3258: my $self=shift;
3259: my $src = $self->src();
1.256 albertel 3260: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3261: }
3262: sub contains_problem {
3263: my $self=shift;
3264: if ($self->is_page()) {
3265: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3266: return $hasProblem;
3267: }
3268: return 0;
1.51 bowersj2 3269: }
1.70 bowersj2 3270: sub is_sequence {
1.51 bowersj2 3271: my $self=shift;
3272: my $src = $self->src();
1.205 bowersj2 3273: return $self->navHash("is_map_", 1) &&
3274: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
1.51 bowersj2 3275: }
1.261 matthew 3276: sub is_survey {
3277: my $self = shift();
3278: my $part = shift();
1.263 albertel 3279: if ($self->parmval('type',$part) eq 'survey') {
1.261 matthew 3280: return 1;
3281: }
1.263 albertel 3282: if ($self->src() =~ /\.(survey)$/) {
1.261 matthew 3283: return 1;
3284: }
3285: return 0;
3286: }
1.51 bowersj2 3287:
1.266 raeburn 3288: sub is_empty_sequence {
3289: my $self=shift;
3290: my $src = $self->src();
3291: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3292: }
3293:
1.101 bowersj2 3294: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 3295: sub parmval {
3296: my $self = shift;
3297: my $what = shift;
1.185 bowersj2 3298: my $part = shift;
3299: if (!defined($part)) {
3300: $part = '0';
3301: }
1.51 bowersj2 3302: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3303: }
3304:
1.70 bowersj2 3305: =pod
3306:
3307: B<Map Methods>
3308:
1.174 albertel 3309: These methods are useful for getting information about the map
3310: properties of the resource, if the resource is a map (B<is_map>).
1.70 bowersj2 3311:
3312: =over 4
3313:
1.174 albertel 3314: =item * B<map_finish>:
3315:
3316: Returns a reference to a resource object corresponding to the finish
3317: resource of the map.
1.70 bowersj2 3318:
1.174 albertel 3319: =item * B<map_pc>:
1.70 bowersj2 3320:
1.174 albertel 3321: Returns the pc value of the map, which is the first number that
3322: appears in the resource ID of the resources in the map, and is the
3323: number that appears around the middle of the symbs of the resources in
3324: that map.
1.70 bowersj2 3325:
1.174 albertel 3326: =item * B<map_start>:
3327:
3328: Returns a reference to a resource object corresponding to the start
3329: resource of the map.
3330:
3331: =item * B<map_type>:
3332:
3333: Returns a string with the type of the map in it.
1.70 bowersj2 3334:
3335: =back
1.51 bowersj2 3336:
1.70 bowersj2 3337: =cut
1.51 bowersj2 3338:
3339: sub map_finish {
3340: my $self = shift;
3341: my $src = $self->src();
1.144 bowersj2 3342: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 3343: my $res = $self->navHash("map_finish_$src", 0);
3344: $res = $self->{NAV_MAP}->getById($res);
3345: return $res;
3346: }
1.70 bowersj2 3347: sub map_pc {
3348: my $self = shift;
3349: my $src = $self->src();
3350: return $self->navHash("map_pc_$src", 0);
3351: }
1.51 bowersj2 3352: sub map_start {
3353: my $self = shift;
3354: my $src = $self->src();
1.144 bowersj2 3355: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 3356: my $res = $self->navHash("map_start_$src", 0);
3357: $res = $self->{NAV_MAP}->getById($res);
3358: return $res;
3359: }
3360: sub map_type {
3361: my $self = shift;
3362: my $pc = $self->map_pc();
3363: return $self->navHash("map_type_$pc", 0);
3364: }
3365:
3366: #####
3367: # Property queries
3368: #####
3369:
3370: # These functions will be responsible for returning the CORRECT
3371: # VALUE for the parameter, no matter what. So while they may look
3372: # like direct calls to parmval, they can be more then that.
3373: # So, for instance, the duedate function should use the "duedatetype"
3374: # information, rather then the resource object user.
3375:
3376: =pod
3377:
3378: =head2 Resource Parameters
3379:
1.174 albertel 3380: In order to use the resource parameters correctly, the nav map must
3381: have been instantiated with genCourseAndUserOptions set to true, so
3382: the courseopt and useropt is read correctly. Then, you can call these
3383: functions to get the relevant parameters for the resource. Each
3384: function defaults to part "0", but can be directed to another part by
3385: passing the part as the parameter.
3386:
3387: These methods are responsible for getting the parameter correct, not
3388: merely reflecting the contents of the GDBM hashes. As we move towards
3389: dates relative to other dates, these methods should be updated to
3390: reflect that. (Then, anybody using these methods will not have to update
3391: their code.)
3392:
3393: =over 4
3394:
3395: =item * B<acc>:
3396:
3397: Get the Client IP/Name Access Control information.
1.51 bowersj2 3398:
1.174 albertel 3399: =item * B<answerdate>:
1.51 bowersj2 3400:
1.174 albertel 3401: Get the answer-reveal date for the problem.
3402:
1.211 bowersj2 3403: =item * B<awarded>:
3404:
3405: Gets the awarded value for the problem part. Requires genUserData set to
3406: true when the navmap object was created.
3407:
1.174 albertel 3408: =item * B<duedate>:
3409:
3410: Get the due date for the problem.
3411:
3412: =item * B<tries>:
3413:
3414: Get the number of tries the student has used on the problem.
3415:
3416: =item * B<maxtries>:
3417:
3418: Get the number of max tries allowed.
3419:
3420: =item * B<opendate>:
1.51 bowersj2 3421:
1.174 albertel 3422: Get the open date for the problem.
1.51 bowersj2 3423:
1.174 albertel 3424: =item * B<sig>:
1.51 bowersj2 3425:
1.174 albertel 3426: Get the significant figures setting.
1.51 bowersj2 3427:
1.174 albertel 3428: =item * B<tol>:
1.51 bowersj2 3429:
1.174 albertel 3430: Get the tolerance for the problem.
1.51 bowersj2 3431:
1.174 albertel 3432: =item * B<tries>:
1.51 bowersj2 3433:
1.174 albertel 3434: Get the number of tries the user has already used on the problem.
1.51 bowersj2 3435:
1.174 albertel 3436: =item * B<type>:
1.51 bowersj2 3437:
1.174 albertel 3438: Get the question type for the problem.
1.70 bowersj2 3439:
1.174 albertel 3440: =item * B<weight>:
1.51 bowersj2 3441:
1.174 albertel 3442: Get the weight for the problem.
1.51 bowersj2 3443:
3444: =back
3445:
3446: =cut
3447:
3448: sub acc {
3449: (my $self, my $part) = @_;
3450: return $self->parmval("acc", $part);
3451: }
3452: sub answerdate {
3453: (my $self, my $part) = @_;
3454: # Handle intervals
3455: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3456: return $self->duedate($part) +
3457: $self->parmval("answerdate", $part);
3458: }
3459: return $self->parmval("answerdate", $part);
1.106 bowersj2 3460: }
1.211 bowersj2 3461: sub awarded {
3462: my $self = shift; my $part = shift;
1.221 bowersj2 3463: $self->{NAV_MAP}->get_user_data();
1.211 bowersj2 3464: if (!defined($part)) { $part = '0'; }
3465: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3466: }
1.51 bowersj2 3467: sub duedate {
3468: (my $self, my $part) = @_;
1.260 albertel 3469: my $interval=$self->parmval("interval", $part);
3470: if ($interval) {
3471: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3472: if ($first_access) { return ($first_access+$interval); }
3473: }
1.51 bowersj2 3474: return $self->parmval("duedate", $part);
3475: }
3476: sub maxtries {
3477: (my $self, my $part) = @_;
3478: return $self->parmval("maxtries", $part);
3479: }
3480: sub opendate {
3481: (my $self, my $part) = @_;
3482: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3483: return $self->duedate($part) -
3484: $self->parmval("opendate", $part);
3485: }
3486: return $self->parmval("opendate");
3487: }
1.185 bowersj2 3488: sub problemstatus {
3489: (my $self, my $part) = @_;
1.236 bowersj2 3490: return lc $self->parmval("problemstatus", $part);
1.185 bowersj2 3491: }
1.51 bowersj2 3492: sub sig {
3493: (my $self, my $part) = @_;
3494: return $self->parmval("sig", $part);
3495: }
3496: sub tol {
3497: (my $self, my $part) = @_;
3498: return $self->parmval("tol", $part);
3499: }
1.108 bowersj2 3500: sub tries {
3501: my $self = shift;
3502: my $tries = $self->queryRestoreHash('tries', shift);
3503: if (!defined($tries)) { return '0';}
1.51 bowersj2 3504: return $tries;
3505: }
1.70 bowersj2 3506: sub type {
3507: (my $self, my $part) = @_;
3508: return $self->parmval("type", $part);
3509: }
1.109 bowersj2 3510: sub weight {
3511: my $self = shift; my $part = shift;
1.211 bowersj2 3512: if (!defined($part)) { $part = '0'; }
3513: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3514: $self->symb(), $ENV{'user.domain'},
3515: $ENV{'user.name'},
3516: $ENV{'request.course.sec'});
3517:
1.70 bowersj2 3518: }
1.51 bowersj2 3519:
3520: # Multiple things need this
3521: sub getReturnHash {
3522: my $self = shift;
3523:
3524: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 3525: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 3526: $self->{RETURN_HASH} = \%tmpHash;
3527: }
3528: }
3529:
3530: ######
3531: # Status queries
3532: ######
3533:
3534: # These methods query the status of problems.
3535:
3536: # If we need to count parts, this function determines the number of
3537: # parts from the metadata. When called, it returns a reference to a list
3538: # of strings corresponding to the parts. (Thus, using it in a scalar context
3539: # tells you how many parts you have in the problem:
3540: # $partcount = scalar($resource->countParts());
3541: # Don't use $self->{PARTS} directly because you don't know if it's been
3542: # computed yet.
3543:
3544: =pod
3545:
3546: =head2 Resource misc
3547:
3548: Misc. functions for the resource.
3549:
3550: =over 4
3551:
1.174 albertel 3552: =item * B<hasDiscussion>:
1.59 bowersj2 3553:
1.174 albertel 3554: Returns a false value if there has been discussion since the user last
3555: logged in, true if there has. Always returns false if the discussion
3556: data was not extracted when the nav map was constructed.
3557:
3558: =item * B<getFeedback>:
3559:
3560: Gets the feedback for the resource and returns the raw feedback string
3561: for the resource, or the null string if there is no feedback or the
3562: email data was not extracted when the nav map was constructed. Usually
3563: used like this:
1.59 bowersj2 3564:
3565: for (split(/\,/, $res->getFeedback())) {
3566: my $link = &Apache::lonnet::escape($_);
3567: ...
3568:
3569: and use the link as appropriate.
3570:
3571: =cut
3572:
3573: sub hasDiscussion {
3574: my $self = shift;
3575: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3576: }
3577:
3578: sub getFeedback {
3579: my $self = shift;
1.124 bowersj2 3580: my $source = $self->src();
1.125 bowersj2 3581: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 3582: return $self->{NAV_MAP}->getFeedback($source);
3583: }
3584:
3585: sub getErrors {
3586: my $self = shift;
3587: my $source = $self->src();
3588: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3589: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 3590: }
3591:
3592: =pod
3593:
1.174 albertel 3594: =item * B<parts>():
1.51 bowersj2 3595:
1.174 albertel 3596: Returns a list reference containing sorted strings corresponding to
1.193 bowersj2 3597: each part of the problem. Single part problems have only a part '0'.
3598: Multipart problems do not return their part '0', since they typically
3599: do not really matter.
1.174 albertel 3600:
3601: =item * B<countParts>():
3602:
3603: Returns the number of parts of the problem a student can answer. Thus,
3604: for single part problems, returns 1. For multipart, it returns the
1.193 bowersj2 3605: number of parts in the problem, not including psuedo-part 0.
1.51 bowersj2 3606:
1.192 bowersj2 3607: =item * B<multipart>():
3608:
1.193 bowersj2 3609: Returns true if the problem is multipart, false otherwise. Use this instead
3610: of countParts if all you want is multipart/not multipart.
1.192 bowersj2 3611:
1.187 bowersj2 3612: =item * B<responseType>($part):
3613:
3614: Returns the response type of the part, without the word "response" on the
3615: end. Example return values: 'string', 'essay', 'numeric', etc.
3616:
1.193 bowersj2 3617: =item * B<responseIds>($part):
1.187 bowersj2 3618:
1.193 bowersj2 3619: Retreives the response IDs for the given part as an array reference containing
3620: strings naming the response IDs. This may be empty.
1.187 bowersj2 3621:
1.51 bowersj2 3622: =back
3623:
3624: =cut
3625:
3626: sub parts {
3627: my $self = shift;
3628:
1.192 bowersj2 3629: if ($self->ext) { return []; }
1.67 bowersj2 3630:
1.51 bowersj2 3631: $self->extractParts();
3632: return $self->{PARTS};
3633: }
3634:
3635: sub countParts {
3636: my $self = shift;
3637:
3638: my $parts = $self->parts();
1.191 bowersj2 3639:
3640: # If I left this here, then it's not necessary.
3641: #my $delta = 0;
3642: #for my $part (@$parts) {
3643: # if ($part eq '0') { $delta--; }
3644: #}
1.66 bowersj2 3645:
3646: if ($self->{RESOURCE_ERROR}) {
3647: return 0;
3648: }
3649:
1.191 bowersj2 3650: return scalar(@{$parts}); # + $delta;
1.192 bowersj2 3651: }
3652:
3653: sub multipart {
3654: my $self = shift;
3655: return $self->countParts() > 1;
1.51 bowersj2 3656: }
3657:
1.225 bowersj2 3658: sub singlepart {
3659: my $self = shift;
3660: return $self->countParts() == 1;
3661: }
3662:
1.187 bowersj2 3663: sub responseType {
1.184 bowersj2 3664: my $self = shift;
3665: my $part = shift;
3666:
3667: $self->extractParts();
1.235 albertel 3668: if (defined($self->{RESPONSE_TYPES}->{$part})) {
3669: return @{$self->{RESPONSE_TYPES}->{$part}};
3670: } else {
3671: return undef;
3672: }
1.187 bowersj2 3673: }
3674:
1.193 bowersj2 3675: sub responseIds {
1.187 bowersj2 3676: my $self = shift;
3677: my $part = shift;
3678:
3679: $self->extractParts();
1.235 albertel 3680: if (defined($self->{RESPONSE_IDS}->{$part})) {
3681: return @{$self->{RESPONSE_IDS}->{$part}};
3682: } else {
3683: return undef;
3684: }
1.184 bowersj2 3685: }
3686:
3687: # Private function: Extracts the parts information, both part names and
1.187 bowersj2 3688: # part types, and saves it.
1.51 bowersj2 3689: sub extractParts {
3690: my $self = shift;
3691:
1.153 bowersj2 3692: return if (defined($self->{PARTS}));
1.67 bowersj2 3693: return if ($self->ext);
1.51 bowersj2 3694:
3695: $self->{PARTS} = [];
3696:
1.181 bowersj2 3697: my %parts;
3698:
1.82 bowersj2 3699: # Retrieve part count, if this is a problem
3700: if ($self->is_problem()) {
1.240 albertel 3701: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
1.152 matthew 3702: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.181 bowersj2 3703:
1.239 bowersj2 3704: if ($partorder) {
3705: my @parts;
3706: for my $part (split (/,/,$partorder)) {
3707: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3708: push @parts, $part;
1.241 albertel 3709: $parts{$part} = 1;
1.239 bowersj2 3710: }
3711: }
3712: $self->{PARTS} = \@parts;
3713: } else {
3714: if (!$metadata) {
3715: $self->{RESOURCE_ERROR} = 1;
3716: $self->{PARTS} = [];
3717: $self->{PART_TYPE} = {};
3718: return;
3719: }
3720: foreach (split(/\,/,$metadata)) {
3721: if ($_ =~ /^part_(.*)$/) {
3722: my $part = $1;
3723: # This floods the logs if it blows up
3724: if (defined($parts{$part})) {
1.241 albertel 3725: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3726: }
1.239 bowersj2 3727:
3728: # check to see if part is turned off.
3729:
3730: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3731: $parts{$part} = 1;
3732: }
3733: }
3734: }
3735: my @sortedParts = sort keys %parts;
3736: $self->{PARTS} = \@sortedParts;
1.51 bowersj2 3737: }
1.82 bowersj2 3738:
1.187 bowersj2 3739:
3740: my %responseIdHash;
3741: my %responseTypeHash;
3742:
1.189 bowersj2 3743:
3744: # Init the responseIdHash
3745: foreach (@{$self->{PARTS}}) {
3746: $responseIdHash{$_} = [];
3747: }
3748:
1.187 bowersj2 3749: # Now, the unfortunate thing about this is that parts, part name, and
1.239 bowersj2 3750: # response id are delimited by underscores, but both the part
1.187 bowersj2 3751: # name and response id can themselves have underscores in them.
3752: # So we have to use our knowlege of part names to figure out
3753: # where the part names begin and end, and even then, it is possible
3754: # to construct ambiguous situations.
3755: foreach (split /,/, $metadata) {
3756: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3757: my $responseType = $1;
3758: my $partStuff = $2;
3759: my $partIdSoFar = '';
3760: my @partChunks = split /_/, $partStuff;
3761: my $i = 0;
3762: for ($i = 0; $i < scalar(@partChunks); $i++) {
3763: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3764: $partIdSoFar .= $partChunks[$i];
3765: if ($parts{$partIdSoFar}) {
3766: my @otherChunks = @partChunks[$i+1..$#partChunks];
3767: my $responseId = join('_', @otherChunks);
1.188 bowersj2 3768: push @{$responseIdHash{$partIdSoFar}}, $responseId;
1.233 matthew 3769: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
1.187 bowersj2 3770: }
3771: }
3772: }
3773: }
1.264 albertel 3774: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
3775: if ($resorder) {
3776: my @resorder=split(/,/,$resorder);
3777: foreach my $part (keys(%responseIdHash)) {
3778: my %resids = map { ($_,1) } @{ $responseIdHash{$part} };
3779: my @neworder;
3780: foreach my $possibleid (@resorder) {
3781: if (exists($resids{$possibleid})) {
3782: push(@neworder,$possibleid);
3783: }
3784: }
3785: $responseIdHash{$part}=\@neworder;
3786: }
3787: }
1.187 bowersj2 3788: $self->{RESPONSE_IDS} = \%responseIdHash;
3789: $self->{RESPONSE_TYPES} = \%responseTypeHash;
1.154 bowersj2 3790: }
3791:
1.51 bowersj2 3792: return;
3793: }
3794:
3795: =pod
3796:
3797: =head2 Resource Status
3798:
1.174 albertel 3799: Problem resources have status information, reflecting their various
3800: dates and completion statuses.
1.51 bowersj2 3801:
1.174 albertel 3802: There are two aspects to the status: the date-related information and
3803: the completion information.
1.51 bowersj2 3804:
1.174 albertel 3805: Idiomatic usage of these two methods would probably look something
3806: like
1.51 bowersj2 3807:
3808: foreach ($resource->parts()) {
3809: my $dateStatus = $resource->getDateStatus($_);
3810: my $completionStatus = $resource->getCompletionStatus($_);
3811:
1.70 bowersj2 3812: or
3813:
3814: my $status = $resource->status($_);
3815:
1.51 bowersj2 3816: ... use it here ...
3817: }
3818:
1.174 albertel 3819: Which you use depends on exactly what you are looking for. The
3820: status() function has been optimized for the nav maps display and may
3821: not precisely match what you need elsewhere.
1.101 bowersj2 3822:
1.174 albertel 3823: The symbolic constants shown below can be accessed through the
3824: resource object: C<$res->OPEN>.
1.101 bowersj2 3825:
1.51 bowersj2 3826: =over 4
3827:
1.174 albertel 3828: =item * B<getDateStatus>($part):
3829:
3830: ($part defaults to 0). A convenience function that returns a symbolic
3831: constant telling you about the date status of the part. The possible
3832: return values are:
1.51 bowersj2 3833:
3834: =back
3835:
3836: B<Date Codes>
3837:
3838: =over 4
3839:
1.174 albertel 3840: =item * B<OPEN_LATER>:
3841:
3842: The problem will be opened later.
3843:
3844: =item * B<OPEN>:
3845:
3846: Open and not yet due.
3847:
1.51 bowersj2 3848:
1.174 albertel 3849: =item * B<PAST_DUE_ANSWER_LATER>:
1.51 bowersj2 3850:
1.174 albertel 3851: The due date has passed, but the answer date has not yet arrived.
1.59 bowersj2 3852:
1.174 albertel 3853: =item * B<PAST_DUE_NO_ANSWER>:
1.54 bowersj2 3854:
1.174 albertel 3855: The due date has passed and there is no answer opening date set.
1.51 bowersj2 3856:
1.174 albertel 3857: =item * B<ANSWER_OPEN>:
1.51 bowersj2 3858:
1.174 albertel 3859: The answer date is here.
3860:
3861: =item * B<NETWORK_FAILURE>:
3862:
3863: The information is unknown due to network failure.
1.51 bowersj2 3864:
3865: =back
3866:
3867: =cut
3868:
3869: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 3870: sub OPEN_LATER { return 0; }
3871: sub OPEN { return 1; }
3872: sub PAST_DUE_NO_ANSWER { return 2; }
3873: sub PAST_DUE_ANSWER_LATER { return 3; }
3874: sub ANSWER_OPEN { return 4; }
3875: sub NOTHING_SET { return 5; }
3876: sub NETWORK_FAILURE { return 100; }
3877:
3878: # getDateStatus gets the date status for a given problem part.
3879: # Because answer date, due date, and open date are fully independent
3880: # (i.e., it is perfectly possible to *only* have an answer date),
3881: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3882: # (past, future, none given). This function handles this with a decision
3883: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 3884:
3885: sub getDateStatus {
3886: my $self = shift;
3887: my $part = shift;
3888: $part = "0" if (!defined($part));
1.54 bowersj2 3889:
3890: # Always return network failure if there was one.
1.51 bowersj2 3891: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3892:
3893: my $now = time();
3894:
1.53 bowersj2 3895: my $open = $self->opendate($part);
3896: my $due = $self->duedate($part);
3897: my $answer = $self->answerdate($part);
3898:
3899: if (!$open && !$due && !$answer) {
3900: # no data on the problem at all
3901: # should this be the same as "open later"? think multipart.
3902: return $self->NOTHING_SET;
3903: }
1.59 bowersj2 3904: if (!$open || $now < $open) {return $self->OPEN_LATER}
3905: if (!$due || $now < $due) {return $self->OPEN}
3906: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3907: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 3908: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 3909: }
3910:
3911: =pod
3912:
3913: B<>
3914:
3915: =over 4
3916:
1.174 albertel 3917: =item * B<getCompletionStatus>($part):
1.51 bowersj2 3918:
1.174 albertel 3919: ($part defaults to 0.) A convenience function that returns a symbolic
3920: constant telling you about the completion status of the part, with the
3921: following possible results:
3922:
3923: =back
1.51 bowersj2 3924:
3925: B<Completion Codes>
3926:
3927: =over 4
3928:
1.174 albertel 3929: =item * B<NOT_ATTEMPTED>:
3930:
3931: Has not been attempted at all.
3932:
3933: =item * B<INCORRECT>:
3934:
3935: Attempted, but wrong by student.
1.51 bowersj2 3936:
1.174 albertel 3937: =item * B<INCORRECT_BY_OVERRIDE>:
1.51 bowersj2 3938:
1.174 albertel 3939: Attempted, but wrong by instructor override.
1.51 bowersj2 3940:
1.174 albertel 3941: =item * B<CORRECT>:
1.51 bowersj2 3942:
1.174 albertel 3943: Correct or correct by instructor.
1.51 bowersj2 3944:
1.174 albertel 3945: =item * B<CORRECT_BY_OVERRIDE>:
1.51 bowersj2 3946:
1.174 albertel 3947: Correct by instructor override.
1.51 bowersj2 3948:
1.174 albertel 3949: =item * B<EXCUSED>:
3950:
3951: Excused. Not yet implemented.
3952:
3953: =item * B<NETWORK_FAILURE>:
3954:
3955: Information not available due to network failure.
3956:
3957: =item * B<ATTEMPTED>:
3958:
3959: Attempted, and not yet graded.
1.69 bowersj2 3960:
1.51 bowersj2 3961: =back
3962:
3963: =cut
3964:
1.53 bowersj2 3965: sub NOT_ATTEMPTED { return 10; }
3966: sub INCORRECT { return 11; }
3967: sub INCORRECT_BY_OVERRIDE { return 12; }
3968: sub CORRECT { return 13; }
3969: sub CORRECT_BY_OVERRIDE { return 14; }
3970: sub EXCUSED { return 15; }
1.69 bowersj2 3971: sub ATTEMPTED { return 16; }
1.51 bowersj2 3972:
3973: sub getCompletionStatus {
3974: my $self = shift;
3975: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3976:
1.108 bowersj2 3977: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 3978:
1.251 www 3979: # Left as separate if statements in case we ever do more with this
1.51 bowersj2 3980: if ($status eq 'correct_by_student') {return $self->CORRECT;}
1.267.2.4 albertel 3981: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
1.51 bowersj2 3982: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3983: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3984: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3985: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 3986: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 3987: return $self->NOT_ATTEMPTED;
1.108 bowersj2 3988: }
3989:
3990: sub queryRestoreHash {
3991: my $self = shift;
3992: my $hashentry = shift;
3993: my $part = shift;
1.185 bowersj2 3994: $part = "0" if (!defined($part) || $part eq '');
1.108 bowersj2 3995: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3996:
3997: $self->getReturnHash();
3998:
3999: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 4000: }
4001:
4002: =pod
4003:
4004: B<Composite Status>
4005:
1.174 albertel 4006: Along with directly returning the date or completion status, the
4007: resource object includes a convenience function B<status>() that will
4008: combine the two status tidbits into one composite status that can
1.191 bowersj2 4009: represent the status of the resource as a whole. This method represents
4010: the concept of the thing we want to display to the user on the nav maps
4011: screen, which is a combination of completion and open status. The precise logic is
1.174 albertel 4012: documented in the comments of the status method. The following results
4013: may be returned, all available as methods on the resource object
1.185 bowersj2 4014: ($res->NETWORK_FAILURE): In addition to the return values that match
4015: the date or completion status, this function can return "ANSWER_SUBMITTED"
4016: if that problemstatus parameter value is set to No, suppressing the
4017: incorrect/correct feedback.
1.51 bowersj2 4018:
4019: =over 4
4020:
1.174 albertel 4021: =item * B<NETWORK_FAILURE>:
4022:
4023: The network has failed and the information is not available.
1.51 bowersj2 4024:
1.174 albertel 4025: =item * B<NOTHING_SET>:
1.53 bowersj2 4026:
1.174 albertel 4027: No dates have been set for this problem (part) at all. (Because only
4028: certain parts of a multi-part problem may be assigned, this can not be
4029: collapsed into "open later", as we do not know a given part will EVER
4030: be opened. For single part, this is the same as "OPEN_LATER".)
1.51 bowersj2 4031:
1.174 albertel 4032: =item * B<CORRECT>:
1.51 bowersj2 4033:
1.174 albertel 4034: For any reason at all, the part is considered correct.
1.54 bowersj2 4035:
1.174 albertel 4036: =item * B<EXCUSED>:
1.51 bowersj2 4037:
1.174 albertel 4038: For any reason at all, the problem is excused.
1.51 bowersj2 4039:
1.174 albertel 4040: =item * B<PAST_DUE_NO_ANSWER>:
1.51 bowersj2 4041:
1.174 albertel 4042: The problem is past due, not considered correct, and no answer date is
4043: set.
1.51 bowersj2 4044:
1.174 albertel 4045: =item * B<PAST_DUE_ANSWER_LATER>:
1.51 bowersj2 4046:
1.174 albertel 4047: The problem is past due, not considered correct, and an answer date in
4048: the future is set.
1.51 bowersj2 4049:
1.174 albertel 4050: =item * B<ANSWER_OPEN>:
4051:
4052: The problem is past due, not correct, and the answer is now available.
4053:
4054: =item * B<OPEN_LATER>:
4055:
4056: The problem is not yet open.
4057:
4058: =item * B<TRIES_LEFT>:
4059:
4060: The problem is open, has been tried, is not correct, but there are
4061: tries left.
4062:
4063: =item * B<INCORRECT>:
4064:
4065: The problem is open, and all tries have been used without getting the
4066: correct answer.
4067:
4068: =item * B<OPEN>:
4069:
4070: The item is open and not yet tried.
4071:
4072: =item * B<ATTEMPTED>:
4073:
4074: The problem has been attempted.
1.69 bowersj2 4075:
1.185 bowersj2 4076: =item * B<ANSWER_SUBMITTED>:
4077:
4078: An answer has been submitted, but the student should not see it.
4079:
1.51 bowersj2 4080: =back
4081:
4082: =cut
4083:
1.185 bowersj2 4084: sub TRIES_LEFT { return 20; }
4085: sub ANSWER_SUBMITTED { return 21; }
1.51 bowersj2 4086:
4087: sub status {
4088: my $self = shift;
4089: my $part = shift;
4090: if (!defined($part)) { $part = "0"; }
4091: my $completionStatus = $self->getCompletionStatus($part);
4092: my $dateStatus = $self->getDateStatus($part);
4093:
4094: # What we have is a two-dimensional matrix with 4 entries on one
4095: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 4096: # plus network failure and "no date data at all".
1.51 bowersj2 4097:
1.222 bowersj2 4098: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
1.53 bowersj2 4099: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 4100:
1.236 bowersj2 4101: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4102: # If there's an answer date and we're past it, don't
4103: # suppress the feedback; student should know
4104: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
4105: $suppressFeedback = 0;
4106: }
1.185 bowersj2 4107:
1.51 bowersj2 4108: # There are a few whole rows we can dispose of:
1.53 bowersj2 4109: if ($completionStatus == CORRECT ||
4110: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.185 bowersj2 4111: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
1.69 bowersj2 4112: }
4113:
4114: if ($completionStatus == ATTEMPTED) {
4115: return ATTEMPTED;
1.53 bowersj2 4116: }
4117:
4118: # If it's EXCUSED, then return that no matter what
4119: if ($completionStatus == EXCUSED) {
4120: return EXCUSED;
1.51 bowersj2 4121: }
4122:
1.53 bowersj2 4123: if ($dateStatus == NOTHING_SET) {
4124: return NOTHING_SET;
1.51 bowersj2 4125: }
4126:
1.69 bowersj2 4127: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4128: # by 4 matrix (date statuses).
1.51 bowersj2 4129:
1.54 bowersj2 4130: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 4131: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.267.2.2 albertel 4132: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
1.51 bowersj2 4133: }
4134:
1.53 bowersj2 4135: if ($dateStatus == ANSWER_OPEN) {
4136: return ANSWER_OPEN;
1.51 bowersj2 4137: }
4138:
4139: # Now: (incorrect, incorrect_override, not_attempted) x
4140: # (open_later), (open)
4141:
1.53 bowersj2 4142: if ($dateStatus == OPEN_LATER) {
4143: return OPEN_LATER;
1.51 bowersj2 4144: }
4145:
4146: # If it's WRONG...
1.53 bowersj2 4147: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 4148: # and there are TRIES LEFT:
1.79 bowersj2 4149: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.222 bowersj2 4150: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
1.51 bowersj2 4151: }
1.185 bowersj2 4152: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 4153: }
4154:
4155: # Otherwise, it's untried and open
1.53 bowersj2 4156: return OPEN;
1.224 bowersj2 4157: }
4158:
4159: sub CLOSED { return 23; }
4160: sub ERROR { return 24; }
4161:
4162: =pod
4163:
4164: B<Simple Status>
4165:
4166: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4167: "Simple status" corresponds to "which icon is shown on the
4168: Navmaps". There are six "simple" statuses:
4169:
4170: =over 4
4171:
4172: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4173:
4174: =item * B<OPEN>: The problem is open and unattempted.
4175:
4176: =item * B<CORRECT>: The problem is correct for any reason.
4177:
4178: =item * B<INCORRECT>: The problem is incorrect and can still be
4179: completed successfully.
4180:
4181: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4182: does not know if they are correct. (The ellipsis icon.)
4183:
4184: =item * B<ERROR>: There is an error retrieving information about this
4185: problem.
4186:
4187: =back
4188:
4189: =cut
4190:
4191: # This hash maps the composite status to this simple status, and
4192: # can be used directly, if you like
4193: my %compositeToSimple =
4194: (
4195: NETWORK_FAILURE() => ERROR,
4196: NOTHING_SET() => CLOSED,
4197: CORRECT() => CORRECT,
4198: EXCUSED() => CORRECT,
4199: PAST_DUE_NO_ANSWER() => INCORRECT,
4200: PAST_DUE_ANSWER_LATER() => INCORRECT,
4201: ANSWER_OPEN() => INCORRECT,
4202: OPEN_LATER() => CLOSED,
4203: TRIES_LEFT() => OPEN,
4204: INCORRECT() => INCORRECT,
4205: OPEN() => OPEN,
4206: ATTEMPTED() => ATTEMPTED,
4207: ANSWER_SUBMITTED() => ATTEMPTED
4208: );
4209:
4210: sub simpleStatus {
4211: my $self = shift;
4212: my $part = shift;
4213: my $status = $self->status($part);
4214: return $compositeToSimple{$status};
1.225 bowersj2 4215: }
4216:
4217: =pod
4218:
4219: B<simpleStatusCount> will return an array reference containing, in
4220: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4221: and ERROR parts the given problem has.
4222:
4223: =cut
4224:
4225: # This maps the status to the slot we want to increment
4226: my %statusToSlotMap =
4227: (
4228: OPEN() => 0,
4229: CLOSED() => 1,
4230: CORRECT() => 2,
4231: INCORRECT() => 3,
4232: ATTEMPTED() => 4,
4233: ERROR() => 5
4234: );
4235:
4236: sub statusToSlot { return $statusToSlotMap{shift()}; }
4237:
4238: sub simpleStatusCount {
4239: my $self = shift;
4240:
4241: my @counts = (0, 0, 0, 0, 0, 0, 0);
4242: foreach my $part (@{$self->parts()}) {
4243: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4244: }
4245:
4246: return \@counts;
1.191 bowersj2 4247: }
4248:
4249: =pod
4250:
4251: B<Completable>
4252:
4253: The completable method represents the concept of I<whether the student can
4254: currently do the problem>. If the student can do the problem, which means
4255: that it is open, there are tries left, and if the problem is manually graded
4256: or the grade is suppressed via problemstatus, the student has not tried it
4257: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4258: either the student has tried it and there is no feedback, or that for
4259: some reason it is no longer completable (not open yet, successfully completed,
4260: out of tries, etc.). As an example, this is used as the filter for the
4261: "Uncompleted Homework" option for the nav maps.
4262:
4263: If this does not quite meet your needs, do not fiddle with it (unless you are
4264: fixing it to better match the student's conception of "completable" because
4265: it's broken somehow)... make a new method.
4266:
4267: =cut
4268:
4269: sub completable {
4270: my $self = shift;
4271: if (!$self->is_problem()) { return 0; }
4272: my $partCount = $self->countParts();
4273:
4274: foreach my $part (@{$self->parts()}) {
4275: if ($part eq '0' && $partCount != 1) { next; }
4276: my $status = $self->status($part);
4277: # "If any of the parts are open, or have tries left (implies open),
4278: # and it is not "attempted" (manually graded problem), it is
4279: # not "complete"
1.216 bowersj2 4280: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4281: $status == ANSWER_SUBMITTED() ) {
4282: # did this part already, as well as we can
4283: next;
4284: }
4285: if ($status == OPEN() || $status == TRIES_LEFT()) {
4286: return 1;
4287: }
1.191 bowersj2 4288: }
4289:
4290: # If all the parts were complete, so was this problem.
1.216 bowersj2 4291: return 0;
1.51 bowersj2 4292: }
4293:
4294: =pod
4295:
4296: =head2 Resource/Nav Map Navigation
4297:
4298: =over 4
4299:
1.174 albertel 4300: =item * B<getNext>():
4301:
4302: Retreive an array of the possible next resources after this
4303: one. Always returns an array, even in the one- or zero-element case.
4304:
4305: =item * B<getPrevious>():
1.85 bowersj2 4306:
1.174 albertel 4307: Retreive an array of the possible previous resources from this
4308: one. Always returns an array, even in the one- or zero-element case.
1.51 bowersj2 4309:
4310: =cut
4311:
4312: sub getNext {
4313: my $self = shift;
4314: my @branches;
4315: my $to = $self->to();
1.85 bowersj2 4316: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 4317: my $choice = $self->{NAV_MAP}->getById($branch);
4318: my $next = $choice->goesto();
4319: $next = $self->{NAV_MAP}->getById($next);
4320:
1.131 bowersj2 4321: push @branches, $next;
1.85 bowersj2 4322: }
4323: return \@branches;
4324: }
4325:
4326: sub getPrevious {
4327: my $self = shift;
4328: my @branches;
4329: my $from = $self->from();
4330: foreach my $branch ( split /,/, $from) {
4331: my $choice = $self->{NAV_MAP}->getById($branch);
4332: my $prev = $choice->comesfrom();
4333: $prev = $self->{NAV_MAP}->getById($prev);
4334:
1.131 bowersj2 4335: push @branches, $prev;
1.51 bowersj2 4336: }
4337: return \@branches;
1.131 bowersj2 4338: }
4339:
4340: sub browsePriv {
4341: my $self = shift;
4342: if (defined($self->{BROWSE_PRIV})) {
4343: return $self->{BROWSE_PRIV};
4344: }
4345:
4346: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 4347: }
4348:
4349: =pod
1.2 www 4350:
1.51 bowersj2 4351: =back
1.2 www 4352:
1.51 bowersj2 4353: =cut
1.2 www 4354:
1.51 bowersj2 4355: 1;
1.2 www 4356:
1.51 bowersj2 4357: __END__
1.2 www 4358:
4359:
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