Annotation of loncom/interface/lonnavmaps.pm, revision 1.141
1.72 bowersj2 1:
1.2 www 2: # The LearningOnline Network with CAPA
3: # Navigate Maps Handler
1.1 www 4: #
1.140 bowersj2 5: # $Id: lonnavmaps.pm,v 1.139 2003/02/06 22:58:12 bowersj2 Exp $
1.20 albertel 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.2 www 29: # (Page Handler
1.1 www 30: #
1.2 www 31: # (TeX Content Handler
1.1 www 32: #
1.2 www 33: # 05/29/00,05/30 Gerd Kortemeyer)
34: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
35: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
1.1 www 36: #
1.17 www 37: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
1.21 www 38: # YEAR=2002
39: # 1/1 Gerd Kortemeyer
1.105 bowersj2 40: # Oct-Nov Jeremy Bowers
1.2 www 41:
1.1 www 42: package Apache::lonnavmaps;
43:
44: use strict;
1.2 www 45: use Apache::Constants qw(:common :http);
1.18 albertel 46: use Apache::loncommon();
1.73 bowersj2 47: use POSIX qw (floor strftime);
1.2 www 48:
1.130 www 49: my %navmaphash;
50: my %parmhash;
51:
1.133 bowersj2 52: # symbolic constants
53: sub SYMB { return 1; }
54: sub URL { return 2; }
55: sub NOTHING { return 3; }
56:
57: # Some data
58:
1.140 bowersj2 59: my $resObj = "Apache::lonnavmaps::resource";
60:
1.135 bowersj2 61: # Keep these mappings in sync with lonquickgrades, which uses the colors
62: # instead of the icons.
63: my %statusIconMap =
1.140 bowersj2 64: ( $resObj->NETWORK_FAILURE => '',
65: $resObj->NOTHING_SET => '',
66: $resObj->CORRECT => 'navmap.correct.gif',
67: $resObj->EXCUSED => 'navmap.correct.gif',
68: $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
69: $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
70: $resObj->ANSWER_OPEN => 'navmap.wrong.gif',
71: $resObj->OPEN_LATER => '',
72: $resObj->TRIES_LEFT => 'navmap.open.gif',
73: $resObj->INCORRECT => 'navmap.wrong.gif',
74: $resObj->OPEN => 'navmap.open.gif',
75: $resObj->ATTEMPTED => 'navmap.open.gif' );
1.135 bowersj2 76:
77: my %iconAltTags =
78: ( 'navmap.correct.gif' => 'Correct',
79: 'navmap.wrong.gif' => 'Incorrect',
80: 'navmap.open.gif' => 'Open' );
1.133 bowersj2 81:
1.136 bowersj2 82: # Defines a status->color mapping, null string means don't color
83: my %colormap =
1.140 bowersj2 84: ( $resObj->NETWORK_FAILURE => '',
85: $resObj->CORRECT => '',
86: $resObj->EXCUSED => '#3333FF',
87: $resObj->PAST_DUE_ANSWER_LATER => '',
88: $resObj->PAST_DUE_NO_ANSWER => '',
89: $resObj->ANSWER_OPEN => '#006600',
90: $resObj->OPEN_LATER => '',
91: $resObj->TRIES_LEFT => '',
92: $resObj->INCORRECT => '',
93: $resObj->OPEN => '',
94: $resObj->NOTHING_SET => '' );
1.136 bowersj2 95: # And a special case in the nav map; what to do when the assignment
96: # is not yet done and due in less then 24 hours
97: my $hurryUpColor = "#FF0000";
98:
1.130 www 99: sub cleanup {
100: if (tied(%navmaphash)){
101: &Apache::lonnet::logthis('Cleanup navmaps: navmaphash');
102: unless (untie(%navmaphash)) {
103: &Apache::lonnet::logthis('Failed cleanup navmaps: navmaphash');
104: }
105: }
106: if (tied(%parmhash)){
107: &Apache::lonnet::logthis('Cleanup navmaps: parmhash');
108: unless (untie(%parmhash)) {
109: &Apache::lonnet::logthis('Failed cleanup navmaps: parmhash');
110: }
111: }
112: }
113:
1.1 www 114: sub handler {
1.99 bowersj2 115: my $r = shift;
1.118 bowersj2 116: real_handler($r);
117: }
118:
119: sub real_handler {
120: my $r = shift;
1.2 www 121:
1.51 bowersj2 122: # Handle header-only request
123: if ($r->header_only) {
124: if ($ENV{'browser.mathml'}) {
125: $r->content_type('text/xml');
126: } else {
127: $r->content_type('text/html');
128: }
129: $r->send_http_header;
130: return OK;
131: }
132:
133: # Send header, don't cache this page
134: if ($ENV{'browser.mathml'}) {
135: $r->content_type('text/xml');
136: } else {
137: $r->content_type('text/html');
138: }
139: &Apache::loncommon::no_cache($r);
140: $r->send_http_header;
141:
1.106 bowersj2 142: # Create the nav map
1.51 bowersj2 143: my $navmap = Apache::lonnavmaps::navmap->new(
144: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 145: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 146:
1.55 bowersj2 147:
148: if (!defined($navmap)) {
149: my $requrl = $r->uri;
150: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
151: return HTTP_NOT_ACCEPTABLE;
152: }
1.64 bowersj2 153:
1.111 bowersj2 154: $r->print("<html><head>\n");
1.118 bowersj2 155: $r->print("<title>Navigate Course Contents</title></head>");
1.111 bowersj2 156:
1.64 bowersj2 157: # Header
1.111 bowersj2 158: $r->print(&Apache::loncommon::bodytag('Navigate Course Contents','',
1.64 bowersj2 159: ''));
160: $r->print('<script>window.focus();</script>');
1.101 bowersj2 161:
1.124 bowersj2 162: $r->rflush();
163:
164: # Now that we've displayed some stuff to the user, init the navmap
165: $navmap->init();
166:
1.55 bowersj2 167:
1.95 bowersj2 168: $r->print('<br> ');
169: $r->rflush();
170:
1.55 bowersj2 171: # Check that it's defined
172: if (!($navmap->courseMapDefined())) {
173: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
174: '</body></html>');
175: return OK;
176: }
177:
1.133 bowersj2 178: # renderer call
1.140 bowersj2 179: my $render = render({ 'cols' => [0,1,2,3],
180: 'url' => '/adm/navmaps',
181: 'printKey' => 1,
182: 'r' => $r});
1.133 bowersj2 183:
1.126 bowersj2 184: $navmap->untieHashes();
1.51 bowersj2 185:
1.128 bowersj2 186: $r->print("</body></html>");
1.134 bowersj2 187: $r->rflush();
1.59 bowersj2 188:
1.51 bowersj2 189: return OK;
190: }
191:
192: # Convenience functions: Returns a string that adds or subtracts
193: # the second argument from the first hash, appropriate for the
194: # query string that determines which folders to recurse on
195: sub addToFilter {
196: my $hashIn = shift;
197: my $addition = shift;
198: my %hash = %$hashIn;
199: $hash{$addition} = 1;
200:
201: return join (",", keys(%hash));
202: }
203:
204: sub removeFromFilter {
205: my $hashIn = shift;
206: my $subtraction = shift;
207: my %hash = %$hashIn;
208:
209: delete $hash{$subtraction};
210: return join(",", keys(%hash));
211: }
212:
213: # Convenience function: Given a stack returned from getStack on the iterator,
214: # return the correct src() value.
215: # Later, this should add an anchor when we start putting anchors in pages.
216: sub getLinkForResource {
217: my $stack = shift;
218: my $res;
219:
220: # Check to see if there are any pages in the stack
221: foreach $res (@$stack) {
222: if (defined($res) && $res->is_page()) {
223: return $res->src();
224: }
225: }
226:
227: # Failing that, return the src of the last resource that is defined
228: # (when we first recurse on a map, it puts an undefined resource
229: # on the bottom because $self->{HERE} isn't defined yet, and we
230: # want the src for the map anyhow)
231: foreach (@$stack) {
232: if (defined($_)) { $res = $_; }
233: }
234:
235: return $res->src();
236: }
237:
1.53 bowersj2 238: # Convenience function: This seperates the logic of how to create
239: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
240: # etc.) into a seperate function. It takes a resource object as the
241: # first parameter, and the part number of the resource as the second.
242: # It's basically a big switch statement on the status of the resource.
243:
244: sub getDescription {
245: my $res = shift;
246: my $part = shift;
1.69 bowersj2 247: my $status = $res->status($part);
1.53 bowersj2 248:
249: if ($status == $res->NETWORK_FAILURE) { return ""; }
250: if ($status == $res->NOTHING_SET) {
251: return "Not currently assigned.";
252: }
253: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 254: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 255: }
256: if ($status == $res->OPEN) {
1.79 bowersj2 257: if ($res->duedate($part)) {
1.73 bowersj2 258: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 259: } else {
260: return "Open, no due date";
261: }
1.53 bowersj2 262: }
1.54 bowersj2 263: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 264: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 265: }
266: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 267: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 268: }
269: if ($status == $res->ANSWER_OPEN) {
270: return "Answer available";
271: }
1.59 bowersj2 272: if ($status == $res->EXCUSED) {
1.66 bowersj2 273: return "Excused by instructor";
1.59 bowersj2 274: }
1.69 bowersj2 275: if ($status == $res->ATTEMPTED) {
276: return "Not yet graded.";
277: }
1.59 bowersj2 278: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 279: my $tries = $res->tries($part);
280: my $maxtries = $res->maxtries($part);
281: my $triesString = "";
282: if ($tries && $maxtries) {
283: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
284: if ($maxtries > 1 && $maxtries - $tries == 1) {
285: $triesString = "<b>$triesString</b>";
286: }
287: }
1.66 bowersj2 288: if ($res->duedate()) {
1.73 bowersj2 289: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 290: " $triesString";
291: } else {
292: return "No due date $triesString";
293: }
1.59 bowersj2 294: }
1.53 bowersj2 295: }
296:
1.115 bowersj2 297: # Convenience function, so others can use it: Is the problem due in less then
298: # 24 hours, and still can be done?
299:
300: sub dueInLessThen24Hours {
301: my $res = shift;
302: my $part = shift;
303: my $status = $res->status($part);
304:
305: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
306: $status == $res->TRIES_LEFT()) &&
307: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
308: $res->duedate() > time();
309: }
310:
311: # Convenience function, so others can use it: Is there only one try remaining for the
312: # part, with more then one try to begin with, not due yet and still can be done?
313: sub lastTry {
314: my $res = shift;
315: my $part = shift;
316:
317: my $tries = $res->tries($part);
318: my $maxtries = $res->maxtries($part);
319: return $tries && $maxtries && $maxtries > 1 &&
320: $maxtries - $tries == 1 && $res->duedate() &&
321: $res->duedate() > time();
322: }
323:
1.101 bowersj2 324: # This puts a human-readable name on the ENV variable.
1.68 bowersj2 325: sub advancedUser {
326: return $ENV{'user.adv'};
327: }
328:
1.73 bowersj2 329:
330: # timeToHumanString takes a time number and converts it to a
331: # human-readable representation, meant to be used in the following
332: # manner:
333: # print "Due $timestring"
334: # print "Open $timestring"
335: # print "Answer available $timestring"
336: # Very, very, very, VERY English-only... goodness help a localizer on
337: # this func...
1.53 bowersj2 338: sub timeToHumanString {
1.58 albertel 339: my ($time) = @_;
340: # zero, '0' and blank are bad times
1.73 bowersj2 341: if (!$time) {
342: return 'never';
343: }
344:
345: my $now = time();
346:
347: my @time = localtime($time);
348: my @now = localtime($now);
349:
350: # Positive = future
351: my $delta = $time - $now;
352:
353: my $minute = 60;
354: my $hour = 60 * $minute;
355: my $day = 24 * $hour;
356: my $week = 7 * $day;
357: my $inPast = 0;
358:
359: # Logic in comments:
360: # Is it now? (extremely unlikely)
361: if ( $delta == 0 ) {
362: return "this instant";
363: }
364:
365: if ($delta < 0) {
366: $inPast = 1;
367: $delta = -$delta;
368: }
369:
370: if ( $delta > 0 ) {
1.101 bowersj2 371:
1.73 bowersj2 372: my $tense = $inPast ? " ago" : "";
373: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 374:
375: # Less then a minute
1.73 bowersj2 376: if ( $delta < $minute ) {
377: if ($delta == 1) { return "${prefix}1 second$tense"; }
378: return "$prefix$delta seconds$tense";
379: }
380:
1.101 bowersj2 381: # Less then an hour
1.73 bowersj2 382: if ( $delta < $hour ) {
383: # If so, use minutes
384: my $minutes = floor($delta / 60);
385: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
386: return "$prefix$minutes minutes$tense";
387: }
388:
389: # Is it less then 24 hours away? If so,
390: # display hours + minutes
391: if ( $delta < $hour * 24) {
392: my $hours = floor($delta / $hour);
393: my $minutes = floor(($delta % $hour) / $minute);
394: my $hourString = "$hours hours";
395: my $minuteString = ", $minutes minutes";
396: if ($hours == 1) {
397: $hourString = "1 hour";
398: }
399: if ($minutes == 1) {
400: $minuteString = ", 1 minute";
401: }
402: if ($minutes == 0) {
403: $minuteString = "";
404: }
405: return "$prefix$hourString$minuteString$tense";
406: }
407:
408: # Less then 5 days away, display day of the week and
409: # HH:MM
410: if ( $delta < $day * 5 ) {
1.85 bowersj2 411: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 412: $timeStr =~ s/12:00 am/midnight/;
413: $timeStr =~ s/12:00 pm/noon/;
414: return ($inPast ? "last " : "next ") .
415: $timeStr;
416: }
417:
418: # Is it this year?
419: if ( $time[5] == $now[5]) {
420: # Return on Month Day, HH:MM meridian
421: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
422: $timeStr =~ s/12:00 am/midnight/;
423: $timeStr =~ s/12:00 pm/noon/;
424: return $timeStr;
425: }
426:
427: # Not this year, so show the year
428: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
429: $timeStr =~ s/12:00 am/midnight/;
430: $timeStr =~ s/12:00 pm/noon/;
431: return $timeStr;
1.58 albertel 432: }
1.53 bowersj2 433: }
434:
1.51 bowersj2 435:
1.133 bowersj2 436: =pod
437:
438: =head1 navmap renderer
439:
440: The navmaprenderer package provides a sophisticated rendering of the standard navigation maps interface into HTML. The provided nav map handler is actually just a glorified call to this.
441:
442: Because of the large number of parameters this function presents, instead of passing it arguments as is normal, pass it in an anonymous hash with the given options. This is because there is no obvious order you may wish to override these in and a hash is easier to read and understand then "undef, undef, undef, 1, undef, undef, renderButton, undef, 0" when you mostly want default behaviors.
443:
444: The package provides a function called 'render', called as Apache::lonnavmaps::renderer->render({}).
1.51 bowersj2 445:
1.133 bowersj2 446: =head2 Overview of Columns
1.51 bowersj2 447:
1.133 bowersj2 448: The renderer will build an HTML table for the navmap and return it. The table is consists of several columns, and a row for each resource (or possibly each part). You tell the renderer how many columns to create and what to place in each column, optionally using one or more of the preparent columns, and the renderer will assemble the table.
1.51 bowersj2 449:
1.133 bowersj2 450: Any additional generally useful column types should be placed in the renderer code here, so anybody can use it anywhere else. Any code specific to the current application (such as the addition of <input> elements in a column) should be placed in the code of the thing using the renderer.
1.51 bowersj2 451:
1.133 bowersj2 452: At the core of the renderer is the array reference COLS (see Example section below for how to pass this correctly). The COLS array will consist of entries of one of two types of things: Either an integer representing one of the pre-packaged column types, or a sub reference that takes a resource reference, a part number, and a reference to the argument hash passed to the renderer, and returns a string that will be inserted into the HTML representation as it.
1.51 bowersj2 453:
1.133 bowersj2 454: The pre-packaged column names are refered to by constants in the Apache::lonnavmaps::renderer namespace. The following currently exist:
1.51 bowersj2 455:
1.133 bowersj2 456: =over 4
1.51 bowersj2 457:
1.133 bowersj2 458: =item * B<resource>: The general info about the resource: Link, icon for the type, etc. The first column in the standard nav map display. This column also accepts the following parameter in the renderer hash:
1.51 bowersj2 459:
460: =over 4
461:
1.133 bowersj2 462: =item * B<resource_nolink>: If true, the resource will not be linked. Default: false, resource will have links.
463:
464: =item * B<resource_part_count>: If true (default), the resource will show a part count if the full part list is not displayed. If false, the resource will never show a part count.
465:
466: =back
1.51 bowersj2 467:
1.133 bowersj2 468: =item B<communication_status>: Whether there is discussion on the resource, email for the user, or (lumped in here) perl errors in the execution of the problem. This is the second column in the main nav map.
1.51 bowersj2 469:
1.133 bowersj2 470: =item B<quick_status>: An icon for the status of a problem, with four possible states: Correct, incorrect, open, or none (not open yet, not a problem). The third column of the standard navmap.
1.51 bowersj2 471:
1.133 bowersj2 472: =item B<long_status>: A text readout of the details of the current status of the problem, such as "Due in 22 hours". The fourth column of the standard navmap.
1.51 bowersj2 473:
1.133 bowersj2 474: =back
1.51 bowersj2 475:
1.133 bowersj2 476: If you add any others please be sure to document them here.
1.51 bowersj2 477:
1.133 bowersj2 478: An example of a column renderer that will show the ID number of a resource, along with the part name if any:
1.51 bowersj2 479:
1.133 bowersj2 480: sub {
481: my ($resource, $part, $params) = @_;
482: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
483: return '<td>' . $resource->{ID} . '</td>';
484: }
1.51 bowersj2 485:
1.133 bowersj2 486: Note these functions are responsible for the TD tags, which allow them to override vertical and horizontal alignment, etc.
1.130 www 487:
1.133 bowersj2 488: =head2 Parameters
1.115 bowersj2 489:
1.140 bowersj2 490: Most of these parameters are only useful if you are *not* using the folder interface (i.e., the default first column), which is probably the common case. If you are using this interface, then you should be able to get away with just using 'cols' (to specify the columns shown), 'url' (necessary for the folders to link to the current screen correctly), and possibly 'queryString' if your app calls for it. In that case, maintaining the state of the folders will be done automatically.
491:
1.133 bowersj2 492: =over 4
1.51 bowersj2 493:
1.140 bowersj2 494: =item * B<iterator>: A reference to a fresh ::iterator to use from the navmaps. The rendering will reflect the options passed to the iterator, so you can use that to just render a certain part of the course, if you like. If one is not passed, the renderer will attempt to construct one from ENV{'form.filter'} and ENV{'form.condition'} information.
495:
496: =item * B<navmap>: A reference to a navmap, used only if an iterator is not passed in. If this is necessary to make an iterator but it is not passed in, a new one will be constructed based on ENV info. This is useful to do basic error checking before passing it off to render.
1.92 bowersj2 497:
1.133 bowersj2 498: =item * B<cols>: An array reference
1.92 bowersj2 499:
1.133 bowersj2 500: =item * B<showParts>: A flag. If yes (default), a line for the resource itself, and a line for each part will be displayed. If not, only one line for each resource will be displayed.
1.51 bowersj2 501:
1.133 bowersj2 502: =item * B<condenseParts>: A flag. If yes (default), if all parts of the problem have the same status and that status is Nothing Set, Correct, or Network Failure, then only one line will be displayed for that resource anyhow. If no, all parts will always be displayed. If showParts is 0, this is ignored.
1.55 bowersj2 503:
1.140 bowersj2 504: =item * B<jumpCount>: A string identifying the URL to place the anchor 'curloc' at. Default to no anchor at all. It is the responsibility of the renderer user to ensure that the #curloc is in the URL. By default, determined through the use of the ENV{} 'jump' and 'jumpType' information.
1.84 bowersj2 505:
1.140 bowersj2 506: =item * B<hereURL>: A URL identifying where to place the 'here' marker. By default, will pull this from the ENV{'form.here*'} info.
1.51 bowersj2 507:
1.140 bowersj2 508: =item * B<hereSymb>: A Symb identifying where to place the 'here' marker. Default same as hereURL.
1.115 bowersj2 509:
1.133 bowersj2 510: =item * B<indentString>: A string identifying the indentation string to use. By default, this is a 25 pixel whitespace image with no alt text.
1.55 bowersj2 511:
1.133 bowersj2 512: =item * B<queryString>: A string which will be prepended to the query string used when the folders are opened or closed.
1.51 bowersj2 513:
1.133 bowersj2 514: =item * B<url>: The url the folders will link to, which should be the current page. Required if the resource info column is shown.
1.51 bowersj2 515:
1.140 bowersj2 516: =item * B<currentJumpIndex>: Describes the currently-open row number to cause the browser to jump to, because the user just opened that folder. By default, pulled from the Jump information in the ENV{'form.*'}.
1.139 bowersj2 517:
518: =item * B<r>: The standard Apache response object. If you pass this to the render, it will use it to flush the table every 20 rows and handle the rendering itself.
519:
1.140 bowersj2 520: =item * B<printKey>: If true, print the key that appears on the top of the standard navmaps. Default is false.
521:
522: =item * B<printCloseAll>: If true, print the "Close all folders" or "open all folders" links. Default is true.
523:
1.133 bowersj2 524: =back
1.51 bowersj2 525:
1.133 bowersj2 526: =head2 Additional Info
1.51 bowersj2 527:
1.133 bowersj2 528: In addition to the parameters you can pass to the renderer, which will be passed through unchange to the column renderers, the renderer will generate the following information which your renderer may find useful:
1.59 bowersj2 529:
1.133 bowersj2 530: =over 4
1.59 bowersj2 531:
1.133 bowersj2 532: =back
1.59 bowersj2 533:
1.133 bowersj2 534: =cut
1.59 bowersj2 535:
1.133 bowersj2 536: sub resource { return 0; }
537: sub communication_status { return 1; }
538: sub quick_status { return 2; }
539: sub long_status { return 3; }
1.124 bowersj2 540:
1.133 bowersj2 541: # Data for render_resource
1.51 bowersj2 542:
1.133 bowersj2 543: sub render_resource {
544: my ($resource, $part, $params) = @_;
1.51 bowersj2 545:
1.133 bowersj2 546: my $nonLinkedText = ''; # stuff after resource title not in link
1.51 bowersj2 547:
1.134 bowersj2 548: my $link = $params->{"resourceLink"};
549: my $src = $resource->src();
550: my $it = $params->{"iterator"};
1.133 bowersj2 551: my $filter = $it->{FILTER};
552:
553: my $title = $resource->compTitle();
554: if ($src =~ /^\/uploaded\//) {
555: $nonLinkedText=$title;
556: $title = '';
557: }
558: my $partLabel = "";
559: my $newBranchText = "";
560:
561: # If this is a new branch, label it so
562: if ($params->{'isNewBranch'}) {
563: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
1.51 bowersj2 564: }
565:
1.133 bowersj2 566: # links to open and close the folder
567: my $linkopen = "<a href='$link'>";
568: my $linkclose = "</a>";
1.51 bowersj2 569:
1.133 bowersj2 570: # Default icon: HTML page
571: my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
572:
573: if ($resource->is_problem()) {
574: if ($part eq "0" || $params->{'condensed'}) {
575: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
576: } else {
577: $icon = $params->{'indentString'};
578: }
579: }
1.51 bowersj2 580:
1.133 bowersj2 581: # Display the correct map icon to open or shut map
582: if ($resource->is_map()) {
583: my $mapId = $resource->map_pc();
584: my $nowOpen = !defined($filter->{$mapId});
585: if ($it->{CONDITION}) {
586: $nowOpen = !$nowOpen;
587: }
588: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
589: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
590:
591: $linkopen = "<a href='" . $params->{'url'} . '?' .
592: $params->{'queryString'} . '&filter=';
593: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
594: addToFilter($filter, $mapId) :
595: removeFromFilter($filter, $mapId);
596: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
597: . $params->{'hereType'} . '&here=' .
598: &Apache::lonnet::escape($params->{'here'}) .
599: '&jumpType=' . SYMB() . '&jump=' .
1.140 bowersj2 600: &Apache::lonnet::escape($resource->symb()) .
601: "&folderManip=1'>";
1.133 bowersj2 602: }
1.51 bowersj2 603:
1.133 bowersj2 604: if ($resource->randomout()) {
605: $nonLinkedText .= ' <i>(hidden)</i> ';
606: }
607:
608: # We're done preparing and finally ready to start the rendering
609: my $result = "<td align='left' valign='center'>";
1.140 bowersj2 610:
611: my $indentLevel = $params->{'indentLevel'};
612: if ($newBranchText) { $indentLevel--; }
613:
1.133 bowersj2 614: # print indentation
1.140 bowersj2 615: for (my $i = 0; $i < $indentLevel; $i++) {
1.133 bowersj2 616: $result .= $params->{'indentString'};
1.84 bowersj2 617: }
618:
1.133 bowersj2 619: # Decide what to display
620: $result .= "$newBranchText$linkopen$icon$linkclose";
621:
622: my $curMarkerBegin = '';
623: my $curMarkerEnd = '';
1.51 bowersj2 624:
1.133 bowersj2 625: # Is this the current resource?
626: if (!$params->{'displayedHereMarker'} &&
627: (($params->{'hereType'} == SYMB() &&
628: $resource->symb() eq $params->{'here'}) ||
629: ($params->{'hereType'} == URL() &&
630: $resource->src() eq $params->{'here'}))) {
631: $curMarkerBegin = '<font color="red" size="+2">> </font>';
632: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1.51 bowersj2 633: }
634:
1.133 bowersj2 635: if ($resource->is_problem() && $part ne "0" &&
636: !$params->{'condensed'}) {
637: $partLabel = " (Part $part)";
638: $title = "";
1.51 bowersj2 639: }
640:
1.133 bowersj2 641: if ($params->{'multipart'} && $params->{'condensed'}) {
642: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51 bowersj2 643: }
644:
1.134 bowersj2 645: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1.51 bowersj2 646:
1.133 bowersj2 647: return $result;
648: }
1.51 bowersj2 649:
1.133 bowersj2 650: sub render_communication_status {
651: my ($resource, $part, $params) = @_;
1.134 bowersj2 652: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
653:
654: my $link = $params->{"resourceLink"};
655: my $linkopen = "<a href='$link'>";
656: my $linkclose = "</a>";
657:
658: if ($resource->hasDiscussion()) {
659: $discussionHTML = $linkopen .
660: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
661: $linkclose;
662: }
663:
664: if ($resource->getFeedback()) {
665: my $feedback = $resource->getFeedback();
666: foreach (split(/\,/, $feedback)) {
667: if ($_) {
668: $feedbackHTML .= ' <a href="/adm/email?display='
669: . &Apache::lonnet::escape($_) . '">'
670: . '<img src="/adm/lonMisc/feedback.gif" '
671: . 'border="0" /></a>';
672: }
673: }
674: }
675:
676: if ($resource->getErrors()) {
677: my $errors = $resource->getErrors();
678: foreach (split(/,/, $errors)) {
679: if ($_) {
680: $errorHTML .= ' <a href="/adm/email?display='
681: . &Apache::lonnet::escape($_) . '">'
682: . '<img src="/adm/lonMisc/bomb.gif" '
683: . 'border="0" /></a>';
684: }
685: }
686: }
687:
688: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
689:
1.133 bowersj2 690: }
691: sub render_quick_status {
692: my ($resource, $part, $params) = @_;
1.135 bowersj2 693: my $result = "";
694: my $firstDisplayed = !$params->{'condensed'} &&
695: $params->{'multipart'} && $part eq "0";
696:
697: my $link = $params->{"resourceLink"};
698: my $linkopen = "<a href='$link'>";
699: my $linkclose = "</a>";
700:
701: if ($resource->is_problem() &&
702: !$firstDisplayed) {
703: my $icon = $statusIconMap{$resource->status($part)};
704: my $alt = $iconAltTags{$icon};
705: if ($icon) {
706: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
707: } else {
708: $result .= "<td width='30'> </td>\n";
709: }
710: } else { # not problem, no icon
711: $result .= "<td width='30'> </td>\n";
712: }
713:
714: return $result;
1.133 bowersj2 715: }
716: sub render_long_status {
717: my ($resource, $part, $params) = @_;
1.136 bowersj2 718: my $result = "<td align='right' valign='center'>\n";
719: my $firstDisplayed = !$params->{'condensed'} &&
720: $params->{'multipart'} && $part eq "0";
721:
722: my $color;
723: if ($resource->is_problem()) {
724: $color = $colormap{$resource->status};
725:
726: if (dueInLessThen24Hours($resource, $part) ||
727: lastTry($resource, $part)) {
728: $color = $hurryUpColor;
729: }
730: }
731:
732: if ($resource->kind() eq "res" &&
733: $resource->is_problem() &&
734: !$firstDisplayed) {
735: if ($color) {$result .= "<font color=\"$color\"><b>"; }
736: $result .= getDescription($resource, $part);
737: if ($color) {$result .= "</b></font>"; }
738: }
739: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
740: $result .= '(randomly select ' . $resource->randompick() .')';
741: }
742:
743: $result .= " </td>\n";
744:
745: return $result;
1.51 bowersj2 746: }
747:
1.133 bowersj2 748: my @preparedColumns = (\&render_resource, \&render_communication_status,
749: \&render_quick_status, \&render_long_status);
1.132 bowersj2 750:
751: sub setDefault {
752: my ($val, $default) = @_;
753: if (!defined($val)) { return $default; }
754: return $val;
755: }
756:
757: sub render {
758: my $args = shift;
1.140 bowersj2 759: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
760: my $result = '';
761:
1.132 bowersj2 762: # Configure the renderer.
763: my $cols = $args->{'cols'};
764: if (!defined($cols)) {
765: # no columns, no nav maps.
766: return '';
767: }
1.140 bowersj2 768: my $mustCloseNavMap = 0;
769: my $navmap;
770: if (defined($args->{'navmap'})) {
771: $navmap = $args->{'navmap'};
772: }
773:
774: my $queryString = $args->{'queryString'};
775: my $jumpToURL = $args->{'jumpToURL'};
776: my $jumpToSymb = $args->{'jumpToSymb'};
777: my $jumpType;
778: my $hereURL = $args->{'hereURL'};
779: my $hereSymb = $args->{'hereSymb'};
780: my $hereType;
781: my $here;
782: my $jump;
783: my $currentJumpIndex = setDefault($args->{'currentJumpIndex'}, 0);
784: my $currentJumpDelta = 2; # change this to change how many resources are displayed
785: # before the current resource when using #current
786:
787: # If we were passed 'here' information, we are not rendering
788: # after a folder manipulation, and we were not passed an
789: # iterator, make sure we open the folders to show the "here"
790: # marker
791: my $filterHash = {};
792: # Figure out what we're not displaying
793: foreach (split(/\,/, $ENV{"form.filter"})) {
794: if ($_) {
795: $filterHash->{$_} = "1";
796: }
797: }
798:
799: my $condition = 0;
800: if ($ENV{'form.condition'}) {
801: $condition = 1;
802: }
803:
804: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
805: # Step 1: Check to see if we have a navmap
806: if (!defined($navmap)) {
807: $navmap = Apache::lonnavmaps::navmap->new(
808: $ENV{"request.course.fn"}.".db",
809: $ENV{"request.course.fn"}."_parms.db", 1, 1);
810: $mustCloseNavMap = 1;
811: }
812: $navmap->init();
813:
814: # Step two: Locate what kind of here marker is necessary
815: # Determine where the "here" marker is and where the screen jumps to.
816:
817: # We're coming from the remote. We have either a url, a symb, or nothing,
818: # and we need to figure out what.
819: # Preference: Symb
820:
821: if ($ENV{'form.symb'}) {
822: $hereType = $jumpType = SYMB();
823: $here = $jump = $ENV{'form.symb'};
824: } elsif ($ENV{'form.postdata'}) {
825: # couldn't find a symb, is there a URL?
826: my $currenturl = $ENV{'form.postdata'};
827: $currenturl=~s/^http\:\/\///;
828: $currenturl=~s/^[^\/]+//;
829:
830: $hereType = $jumpType = URL;
831: $here = $jump = $currenturl;
832: } else {
833: # Nothing
834: $hereType = $jumpType = NOTHING();
835: }
836: # Step three: Ensure the folders are open
837: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
838: my $depth = 1;
839: $mapIterator->next(); # discard the first BEGIN_MAP
840: my $curRes = $mapIterator->next();
841: my $counter = 0;
842: my $found = 0;
843:
844: # We only need to do this if we need to open the maps to show the
845: # current position. This will change the counter so we can't count
846: # for the jump marker with this loop.
847: while ($depth > 0 && !$found) {
848: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
849: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
850:
851: if (ref($curRes) &&
852: ($hereType == SYMB() && $curRes->symb() eq $here) ||
853: (ref($curRes) && $hereType == URL() && $curRes->src() eq $here)) {
854: my $mapStack = $mapIterator->getStack();
855:
856: # Ensure the parent maps are open
857: for my $map (@{$mapStack}) {
858: if ($condition) {
859: undef $filterHash->{$map->map_pc()};
860: } else {
861: $filterHash->{$map->map_pc()} = 1;
862: }
863: }
864: $found = 1;
865: }
866:
867: $curRes = $mapIterator->next();
868: }
869:
870: # Since we changed the folders, (re-)locate the jump point, if any
871: $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
872: $depth = 1;
873: $mapIterator->next();
874: $curRes = $mapIterator->next();
875: my $foundJump = 0;
876:
877: while ($depth > 0 && !$foundJump) {
878: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
879: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
880: if (ref($curRes)) { $counter++; }
881:
882: if (ref($curRes) &&
883: (($jumpType == SYMB() && $curRes->symb() eq $jump) ||
884: ($jumpType == URL() && $curRes->src() eq $jump))) {
885:
886: # This is why we have to use the main iterator instead of the
887: # potentially faster DFS: The count has to be the same, so
888: # the order has to be the same, which DFS won't give us.
889: $currentJumpIndex = $counter;
890: $foundJump = 1;
891: }
892:
893: $curRes = $mapIterator->next();
894: }
895:
896: }
897: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
898: # If this is a click on a folder or something, we want to preserve the "here"
899: # from the querystring, and get the new "jump" marker
900: $hereType = $ENV{'form.hereType'};
901: $here = $ENV{'form.here'};
902: $jumpType = $ENV{'form.jumpType'} || NOTHING();
903: $jump = $ENV{'form.jump'};
904: }
905:
1.132 bowersj2 906: my $it = $args->{'iterator'};
907: if (!defined($it)) {
1.140 bowersj2 908: # Construct a default iterator based on $ENV{'form.'} information
909:
910: # Step 1: Check to see if we have a navmap
911: if (!defined($navmap)) {
912: $navmap = Apache::lonnavmaps::navmap->new(
913: $ENV{"request.course.fn"}.".db",
914: $ENV{"request.course.fn"}."_parms.db", 1, 1);
915: $mustCloseNavMap = 1;
916: }
917: # Paranoia: Make sure it's ready
918: $navmap->init();
919:
920: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1.132 bowersj2 921: }
922:
923: my $showParts = setDefault($args->{'showParts'}, 1);
924: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139 bowersj2 925: # keeps track of when the current resource is found,
926: # so we can back up a few and put the anchor above the
927: # current resource
928: my $r = $args->{'r'};
1.140 bowersj2 929: my $printKey = $args->{'printKey'};
930: my $printCloseAll = $args->{'printCloseAll'};
931: if (!defined($printCloseAll)) { $printCloseAll = 1; }
932:
933: # Print key?
934: if ($printKey) {
935: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
936: my $date=localtime;
937: $result.='<tr><td align="right" valign="bottom">Key: </td>';
938: if ($navmap->{LAST_CHECK}) {
939: $result .=
940: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
941: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
942: '</td><td align="center" valign="bottom"> '.
943: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
944: '</td>';
945: } else {
946: $result .= '<td align="center" valign="bottom"> '.
947: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
948: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
949: '</td>';
950: }
951:
952: $result .= '</tr></table>';
953: }
954:
955: if ($printCloseAll) {
956: if ($condition) {
957: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
958: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
959: "\">Close All Folders</a>";
960: } else {
961: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
962: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
963: "\">Open All Folders</a>";
964: }
965: }
966:
967: if ($r) {
968: $r->print($result);
969: $r->rflush();
970: $result = "";
971: }
1.132 bowersj2 972: # End parameter setting
1.133 bowersj2 973:
1.132 bowersj2 974: # Data
1.140 bowersj2 975: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132 bowersj2 976: my $res = "Apache::lonnavmaps::resource";
977: my %condenseStatuses =
978: ( $res->NETWORK_FAILURE => 1,
979: $res->NOTHING_SET => 1,
980: $res->CORRECT => 1 );
981: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133 bowersj2 982:
983: # Shared variables
984: $args->{'counter'} = 0; # counts the rows
985: $args->{'indentLevel'} = 0;
986: $args->{'isNewBranch'} = 0;
987: $args->{'condensed'} = 0;
988: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
989: $args->{'displayedHereMarker'} = 0;
1.132 bowersj2 990:
1.133 bowersj2 991: my $displayedJumpMarker = 0;
1.132 bowersj2 992: # Set up iteration.
993: my $depth = 1;
994: $it->next(); # discard initial BEGIN_MAP
995: my $curRes = $it->next();
996: my $now = time();
997: my $in24Hours = $now + 24 * 60 * 60;
998: my $rownum = 0;
999:
1.141 ! bowersj2 1000: # export "here" marker information
! 1001: $args->{'here'} = $here;
! 1002: $args->{'hereType'} = $hereType;
! 1003:
1.132 bowersj2 1004: while ($depth > 0) {
1005: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1006: if ($curRes == $it->END_MAP()) { $depth--; }
1007:
1008: # Maintain indentation level.
1009: if ($curRes == $it->BEGIN_MAP() ||
1010: $curRes == $it->BEGIN_BRANCH() ) {
1.133 bowersj2 1011: $args->{'indentLevel'}++;
1.132 bowersj2 1012: }
1013: if ($curRes == $it->END_MAP() ||
1014: $curRes == $it->END_BRANCH() ) {
1.133 bowersj2 1015: $args->{'indentLevel'}--;
1.132 bowersj2 1016: }
1017: # Notice new branches
1018: if ($curRes == $it->BEGIN_BRANCH()) {
1.133 bowersj2 1019: $args->{'isNewBranch'} = 1;
1020: }
1021:
1022: # If this isn't an actual resource, continue on
1023: if (!ref($curRes)) {
1024: $curRes = $it->next();
1025: next;
1.132 bowersj2 1026: }
1.133 bowersj2 1027:
1028: $args->{'counter'}++;
1.132 bowersj2 1029:
1030: # Does it have multiple parts?
1.133 bowersj2 1031: $args->{'multipart'} = 0;
1032: $args->{'condensed'} = 0;
1.132 bowersj2 1033: my @parts;
1034:
1035: # Decide what parts to show.
1.133 bowersj2 1036: if ($curRes->is_problem() && $showParts) {
1.132 bowersj2 1037: @parts = @{$curRes->parts()};
1.133 bowersj2 1038: $args->{'multipart'} = scalar(@parts) > 1;
1.132 bowersj2 1039:
1040: if ($condenseParts) { # do the condensation
1041: if (!$curRes->opendate("0")) {
1042: @parts = ("0");
1.133 bowersj2 1043: $args->{'condensed'} = 1;
1.132 bowersj2 1044: }
1.133 bowersj2 1045: if (!$args->{'condensed'}) {
1.132 bowersj2 1046: # Decide whether to condense based on similarity
1047: my $status = $curRes->status($parts[1]);
1048: my $due = $curRes->duedate($parts[1]);
1049: my $open = $curRes->opendate($parts[1]);
1050: my $statusAllSame = 1;
1051: my $dueAllSame = 1;
1052: my $openAllSame = 1;
1053: for (my $i = 2; $i < scalar(@parts); $i++) {
1054: if ($curRes->status($parts[$i]) != $status){
1055: $statusAllSame = 0;
1056: }
1057: if ($curRes->duedate($parts[$i]) != $due ) {
1058: $dueAllSame = 0;
1059: }
1060: if ($curRes->opendate($parts[$i]) != $open) {
1061: $openAllSame = 0;
1062: }
1063: }
1064: # $*allSame is true if all the statuses were
1065: # the same. Now, if they are all the same and
1066: # match one of the statuses to condense, or they
1067: # are all open with the same due date, or they are
1068: # all OPEN_LATER with the same open date, display the
1069: # status of the first non-zero part (to get the 'correct'
1070: # status right, since 0 is never 'correct' or 'open').
1071: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1072: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1073: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1074: @parts = ($parts[1]);
1.133 bowersj2 1075: $args->{'condensed'} = 1;
1.132 bowersj2 1076: }
1077:
1078: }
1079: }
1080:
1081: } else {
1082: # Not showing parts
1083: @parts = ("0"); # show main part only
1084: }
1085:
1086: # If the multipart problem was condensed, "forget" it was multipart
1087: if (scalar(@parts) == 1) {
1.133 bowersj2 1088: $args->{'multipart'} = 0;
1.132 bowersj2 1089: }
1090:
1091: # In the event of a network error, display one part.
1092: # If this is a single part, we can at least show the correct
1093: # status, but if it's multipart, we're lost, since we can't
1094: # retreive the metadata to count the parts
1095: if ($curRes->{RESOURCE_ERROR}) {
1096: @parts = ("0");
1097: }
1098:
1099: # Now, we've decided what parts to show. Loop through them and
1100: # show them.
1101: foreach my $part (@parts) {
1102: $rownum ++;
1103: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1104:
1105: $result .= " <tr bgcolor='$backgroundColor'>\n";
1.134 bowersj2 1106:
1107: # Set up some data about the parts that the cols might want
1108: my $filter = $it->{FILTER};
1109: my $stack = $it->getStack();
1110: my $src = getLinkForResource($stack);
1111:
1112: my $srcHasQuestion = $src =~ /\?/;
1113: $args->{"resourceLink"} = $src.
1114: ($srcHasQuestion?'&':'?') .
1.137 bowersj2 1115: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1.132 bowersj2 1116:
1117: # Now, display each column.
1118: foreach my $col (@$cols) {
1.139 bowersj2 1119: my $colHTML = '';
1120: if (ref($col)) {
1121: $colHTML .= &$col($curRes, $part, $args);
1122: } else {
1123: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1124: }
1.132 bowersj2 1125:
1.133 bowersj2 1126: # If this is the first column and it's time to print
1127: # the anchor, do so
1128: if ($col == $cols->[0] &&
1129: $args->{'counter'} == $args->{'currentJumpIndex'} -
1.139 bowersj2 1130: $currentJumpDelta) {
1131: # Jam the anchor after the <td> tag;
1132: # necessary for valid HTML (which Mozilla requires)
1133: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133 bowersj2 1134: $displayedJumpMarker = 1;
1135: }
1.139 bowersj2 1136: $result .= $colHTML . "\n";
1.132 bowersj2 1137: }
1.139 bowersj2 1138: $result .= " </tr>\n";
1.140 bowersj2 1139: $args->{'isNewBranch'} = 0;
1.139 bowersj2 1140: }
1141:
1142: if ($r && $rownum % 20 == 0) {
1143: $r->print($result);
1144: $result = "";
1145: $r->rflush();
1.132 bowersj2 1146: }
1147:
1148: $curRes = $it->next();
1149: }
1150:
1.134 bowersj2 1151: # Print out the part that jumps to #curloc if it exists
1.139 bowersj2 1152: if ($displayedJumpMarker) {
1153: $result .= "<script>location += \"#curloc\";</script>\n";
1.134 bowersj2 1154: }
1155:
1.132 bowersj2 1156: $result .= "</table>";
1.140 bowersj2 1157:
1158: if ($r) {
1159: $r->print($result);
1160: $result = "";
1161: $r->rflush();
1162: }
1163:
1164: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1.132 bowersj2 1165:
1166: return $result;
1167: }
1168:
1.133 bowersj2 1169: 1;
1170:
1171: package Apache::lonnavmaps::navmap;
1172:
1173: =pod
1174:
1175: lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, the Apache handler for the "Navigation Map" button, and a flexible prepared renderer for navigation maps that are easy to use anywhere.
1176:
1177: =head1 navmap object: Encapsulating the compiled nav map
1178:
1179: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
1180:
1181: Most notably it provides a way to navigate the map sensibly and a flexible iterator that makes it easy to write various renderers based on nav maps.
1182:
1183: You must obtain resource objects through the navmap object.
1184:
1185: =head2 Methods
1186:
1187: =over 4
1188:
1189: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions, genMailDiscussStatus): Binds a new navmap object to the compiled nav map hash and parm hash given as filenames. genCourseAndUserOptions is a flag saying whether the course options and user options hash should be generated. This is for when you are using the parameters of the resources that require them; see documentation in resource object documentation. genMailDiscussStatus causes the nav map to retreive information about the email and discussion status of resources. Returns the navmap object if this is successful, or B<undef> if not. You must check for undef; errors will occur when you try to use the other methods otherwise.
1190:
1191: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
1192:
1193: =cut
1194:
1195: use strict;
1196: use GDBM_File;
1197:
1198: sub new {
1199: # magic invocation to create a class instance
1200: my $proto = shift;
1201: my $class = ref($proto) || $proto;
1202: my $self = {};
1203:
1204: $self->{NAV_HASH_FILE} = shift;
1205: $self->{PARM_HASH_FILE} = shift;
1206: $self->{GENERATE_COURSE_USER_OPT} = shift;
1207: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1208:
1209: # Resource cache stores navmap resources as we reference them. We generate
1210: # them on-demand so we don't pay for creating resources unless we use them.
1211: $self->{RESOURCE_CACHE} = {};
1212:
1213: # Network failure flag, if we accessed the course or user opt and
1214: # failed
1215: $self->{NETWORK_FAILURE} = 0;
1216:
1217: # tie the nav hash
1218:
1219: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1220: &GDBM_READER(), 0640))) {
1221: return undef;
1222: }
1223:
1224: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1225: &GDBM_READER(), 0640)))
1226: {
1227: untie $self->{PARM_HASH};
1228: return undef;
1229: }
1230:
1231: $self->{HASH_TIED} = 1;
1232: $self->{NAV_HASH} = \%navmaphash;
1233: $self->{PARM_HASH} = \%parmhash;
1.140 bowersj2 1234: $self->{INITED} = 0;
1.133 bowersj2 1235:
1236: bless($self);
1237:
1238: return $self;
1239: }
1240:
1241: sub init {
1242: my $self = shift;
1.140 bowersj2 1243: if ($self->{INITED}) { return; }
1.133 bowersj2 1244:
1245: # If the course opt hash and the user opt hash should be generated,
1246: # generate them
1247: if ($self->{GENERATE_COURSE_USER_OPT}) {
1248: my $uname=$ENV{'user.name'};
1249: my $udom=$ENV{'user.domain'};
1250: my $uhome=$ENV{'user.home'};
1251: my $cid=$ENV{'request.course.id'};
1252: my $chome=$ENV{'course.'.$cid.'.home'};
1253: my ($cdom,$cnum)=split(/\_/,$cid);
1254:
1255: my $userprefix=$uname.'_'.$udom.'_';
1256:
1257: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1258: unless ($uhome eq 'no_host') {
1259: # ------------------------------------------------- Get coursedata (if present)
1260: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1261: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1262: ':resourcedata',$chome);
1263: if ($reply!~/^error\:/) {
1264: $courserdatas{$cid}=$reply;
1265: $courserdatas{$cid.'.last_cache'}=time;
1266: }
1267: # check to see if network failed
1268: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1269: {
1270: $self->{NETWORK_FAILURE} = 1;
1271: }
1272: }
1273: foreach (split(/\&/,$courserdatas{$cid})) {
1274: my ($name,$value)=split(/\=/,$_);
1275: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1276: &Apache::lonnet::unescape($value);
1277: }
1278: # --------------------------------------------------- Get userdata (if present)
1279: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1280: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1281: if ($reply!~/^error\:/) {
1282: $userrdatas{$uname.'___'.$udom}=$reply;
1283: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1284: }
1285: # check to see if network failed
1286: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1287: {
1288: $self->{NETWORK_FAILURE} = 1;
1289: }
1290: }
1291: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1292: my ($name,$value)=split(/\=/,$_);
1293: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1294: &Apache::lonnet::unescape($value);
1295: }
1296: $self->{COURSE_OPT} = \%courseopt;
1297: $self->{USER_OPT} = \%useropt;
1298: }
1299: }
1300:
1301: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1302: my $cid=$ENV{'request.course.id'};
1303: my ($cdom,$cnum)=split(/\_/,$cid);
1304:
1305: my %emailstatus = &Apache::lonnet::dump('email_status');
1306: my $logoutTime = $emailstatus{'logout'};
1307: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1308: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1309: $courseLeaveTime : $logoutTime);
1310: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1311: $cdom, $cnum);
1312: my %feedback=();
1313: my %error=();
1314: my $keys = &Apache::lonnet::reply('keys:'.
1315: $ENV{'user.domain'}.':'.
1316: $ENV{'user.name'}.':nohist_email',
1317: $ENV{'user.home'});
1318:
1319: foreach my $msgid (split(/\&/, $keys)) {
1320: $msgid=&Apache::lonnet::unescape($msgid);
1321: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1322: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1323: my ($what,$url)=($1,$2);
1324: my %status=
1325: &Apache::lonnet::get('email_status',[$msgid]);
1326: if ($status{$msgid}=~/^error\:/) {
1327: $status{$msgid}='';
1328: }
1329:
1330: if (($status{$msgid} eq 'new') ||
1331: (!$status{$msgid})) {
1332: if ($what eq 'Error') {
1333: $error{$url}.=','.$msgid;
1334: } else {
1335: $feedback{$url}.=','.$msgid;
1336: }
1337: }
1338: }
1339: }
1340:
1341: $self->{FEEDBACK} = \%feedback;
1342: $self->{ERROR_MSG} = \%error; # what is this? JB
1343: $self->{DISCUSSION_TIME} = \%discussiontime;
1344: $self->{EMAIL_STATUS} = \%emailstatus;
1345:
1346: }
1347:
1348: $self->{PARM_CACHE} = {};
1.140 bowersj2 1349: $self->{INITED} = 1;
1.133 bowersj2 1350: }
1351:
1352: # Internal function: Takes a key to look up in the nav hash and implements internal
1353: # memory caching of that key.
1354: sub navhash {
1355: my $self = shift; my $key = shift;
1356: return $self->{NAV_HASH}->{$key};
1357: }
1358:
1359: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1360: sub courseMapDefined {
1361: my $self = shift;
1362: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1363:
1364: my $firstres = $self->navhash("map_start_$uri");
1365: my $lastres = $self->navhash("map_finish_$uri");
1366: return $firstres && $lastres;
1367: }
1368:
1369: sub getIterator {
1370: my $self = shift;
1371: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1372: shift, undef, shift);
1373: return $iterator;
1374: }
1375:
1376: # unties the hash when done
1377: sub untieHashes {
1378: my $self = shift;
1379: untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
1380: untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
1381: $self->{HASH_TIED} = 0;
1382: }
1383:
1384: # when the object is destroyed, be sure to untie all the hashes we tied.
1385: sub DESTROY {
1386: my $self = shift;
1387: $self->untieHashes();
1388: }
1389:
1390: # Private method: Does the given resource (as a symb string) have
1391: # current discussion? Returns 0 if chat/mail data not extracted.
1392: sub hasDiscussion {
1393: my $self = shift;
1394: my $symb = shift;
1395: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1396:
1397: #return defined($self->{DISCUSSION_TIME}->{$symb});
1398: return $self->{DISCUSSION_TIME}->{$symb} >
1399: $self->{LAST_CHECK};
1400: }
1401:
1402: # Private method: Does the given resource (as a symb string) have
1403: # current feedback? Returns the string in the feedback hash, which
1404: # will be false if it does not exist.
1405: sub getFeedback {
1406: my $self = shift;
1407: my $symb = shift;
1408:
1409: if (!defined($self->{FEEDBACK})) { return ""; }
1410:
1411: return $self->{FEEDBACK}->{$symb};
1412: }
1413:
1414: # Private method: Get the errors for that resource (by source).
1415: sub getErrors {
1416: my $self = shift;
1417: my $src = shift;
1418:
1419: if (!defined($self->{ERROR_MSG})) { return ""; }
1420: return $self->{ERROR_MSG}->{$src};
1421: }
1422:
1423: =pod
1424:
1425: =item * B<getById>(id): Based on the ID of the resource (1.1, 3.2, etc.), get a resource object for that resource. This method, or other methods that use it (as in the resource object) is the only proper way to obtain a resource object.
1426:
1427: =cut
1428:
1429: # The strategy here is to cache the resource objects, and only construct them
1430: # as we use them. The real point is to prevent reading any more from the tied
1431: # hash then we have to, which should hopefully alleviate speed problems.
1432: # Caching is just an incidental detail I throw in because it makes sense.
1433:
1434: sub getById {
1435: my $self = shift;
1436: my $id = shift;
1437:
1438: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1439: {
1440: return $self->{RESOURCE_CACHE}->{$id};
1441: }
1442:
1443: # resource handles inserting itself into cache.
1444: # Not clear why the quotes are necessary, but as of this
1445: # writing it doesn't work without them.
1446: return "Apache::lonnavmaps::resource"->new($self, $id);
1.132 bowersj2 1447: }
1.133 bowersj2 1448:
1449: =pod
1450:
1451: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
1452:
1453: =cut
1454:
1455: sub firstResource {
1456: my $self = shift;
1457: my $firstResource = $self->navhash('map_start_' .
1458: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1459: return $self->getById($firstResource);
1.132 bowersj2 1460: }
1.133 bowersj2 1461:
1462: =pod
1463:
1464: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
1465:
1466: =cut
1467:
1468: sub finishResource {
1469: my $self = shift;
1470: my $firstResource = $self->navhash('map_finish_' .
1471: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1472: return $self->getById($firstResource);
1.132 bowersj2 1473: }
1.133 bowersj2 1474:
1475: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1476: # the actual lookup; parmval caches the results.
1477: sub parmval {
1478: my $self = shift;
1479: my ($what,$symb)=@_;
1480: my $hashkey = $what."|||".$symb;
1481:
1482: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1483: return $self->{PARM_CACHE}->{$hashkey};
1484: }
1485:
1486: my $result = $self->parmval_real($what, $symb);
1487: $self->{PARM_CACHE}->{$hashkey} = $result;
1488: return $result;
1.132 bowersj2 1489: }
1490:
1.133 bowersj2 1491: sub parmval_real {
1492: my $self = shift;
1493: my ($what,$symb) = @_;
1494:
1495: my $cid=$ENV{'request.course.id'};
1496: my $csec=$ENV{'request.course.sec'};
1497: my $uname=$ENV{'user.name'};
1498: my $udom=$ENV{'user.domain'};
1499:
1500: unless ($symb) { return ''; }
1501: my $result='';
1502:
1503: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1504:
1505: # ----------------------------------------------------- Cascading lookup scheme
1506: my $rwhat=$what;
1507: $what=~s/^parameter\_//;
1508: $what=~s/\_/\./;
1509:
1510: my $symbparm=$symb.'.'.$what;
1511: my $mapparm=$mapname.'___(all).'.$what;
1512: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1513:
1514: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1515: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1516: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1517:
1518: my $courselevel= $usercourseprefix.'.'.$what;
1519: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1520: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1521:
1522: my $useropt = $self->{USER_OPT};
1523: my $courseopt = $self->{COURSE_OPT};
1524: my $parmhash = $self->{PARM_HASH};
1525:
1526: # ---------------------------------------------------------- first, check user
1527: if ($uname and defined($useropt)) {
1528: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1529: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1530: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1531: }
1532:
1533: # ------------------------------------------------------- second, check course
1534: if ($csec and defined($courseopt)) {
1535: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1536: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1537: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1538: }
1539:
1540: if (defined($courseopt)) {
1541: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1542: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1543: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1544: }
1545:
1546: # ----------------------------------------------------- third, check map parms
1547:
1548: my $thisparm=$$parmhash{$symbparm};
1549: if (defined($thisparm)) { return $thisparm; }
1550:
1551: # ----------------------------------------------------- fourth , check default
1552:
1553: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1554: if (defined($default)) { return $default}
1555:
1556: # --------------------------------------------------- fifth , cascade up parts
1557:
1558: my ($space,@qualifier)=split(/\./,$rwhat);
1559: my $qualifier=join('.',@qualifier);
1560: unless ($space eq '0') {
1561: my ($part,$id)=split(/\_/,$space);
1562: if ($id) {
1563: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1564: if (defined($partgeneral)) { return $partgeneral; }
1565: } else {
1566: my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
1567: if (defined($resourcegeneral)) { return $resourcegeneral; }
1568: }
1569: }
1570: return '';
1571: }
1.51 bowersj2 1572:
1573: 1;
1574:
1575: package Apache::lonnavmaps::iterator;
1576:
1577: =pod
1578:
1579: =back
1580:
1581: =head1 navmap Iterator
1582:
1583: An I<iterator> encapsulates the logic required to traverse a data structure. navmap uses an iterator to traverse the course map according to the criteria you wish to use.
1584:
1585: To obtain an iterator, call the B<getIterator>() function of a B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator directly.) This will return a reference to the iterator:
1586:
1587: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1588:
1589: To get the next thing from the iterator, call B<next>:
1590:
1591: C<my $nextThing = $resourceIterator-E<gt>next()>
1592:
1593: getIterator behaves as follows:
1594:
1595: =over 4
1596:
1.116 bowersj2 1597: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0. forceTop is a boolean value. If it is false (default), the iterator will only return the first level of map that is not just a single, 'redirecting' map. If true, the iterator will return all information, starting with the top-level map, regardless of content.
1.51 bowersj2 1598:
1.101 bowersj2 1599: Thus, by default, only top-level resources will be shown. Change the condition to a 1 without changing the hash, and all resources will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively suppress parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively add parts of the nav map. See the handler code for examples.
1.51 bowersj2 1600:
1601: The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:
1602:
1603: =over 4
1604:
1.70 bowersj2 1605: =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
1606:
1607: =item * END_MAP: The map is now done.
1608:
1609: =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
1610:
1611: =item * END_BRANCH: The branch is now done.
1.51 bowersj2 1612:
1613: =back
1614:
1.70 bowersj2 1615: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
1616:
1.116 bowersj2 1617: Maps can contain empty resources. The iterator will automatically skip over such resources, but will still treat the structure correctly. Thus, a complicated map with several branches, but consisting entirely of empty resources except for one beginning or ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs, but only one resource will be returned.
1618:
1.70 bowersj2 1619: =back
1.51 bowersj2 1620:
1621: =cut
1622:
1623: # Here are the tokens for the iterator:
1624:
1625: sub BEGIN_MAP { return 1; } # begining of a new map
1626: sub END_MAP { return 2; } # end of the map
1627: sub BEGIN_BRANCH { return 3; } # beginning of a branch
1628: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 1629: sub FORWARD { return 1; } # go forward
1630: sub BACKWARD { return 2; }
1.51 bowersj2 1631:
1.96 bowersj2 1632: sub min {
1633: (my $a, my $b) = @_;
1634: if ($a < $b) { return $a; } else { return $b; }
1635: }
1636:
1.107 bowersj2 1637: # In the CVS repository, documentation of this algorithm is included
1638: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
1639: # will reference the same location in the text as the part of the
1640: # algorithm is running through.
1641:
1.94 bowersj2 1642: sub new {
1643: # magic invocation to create a class instance
1644: my $proto = shift;
1645: my $class = ref($proto) || $proto;
1646: my $self = {};
1647:
1648: $self->{NAV_MAP} = shift;
1649: return undef unless ($self->{NAV_MAP});
1650:
1651: # Handle the parameters
1652: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1653: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1654:
1655: # If the given resources are just the ID of the resource, get the
1656: # objects
1657: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1658: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1659: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1660: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1661:
1662: $self->{FILTER} = shift;
1663:
1664: # A hash, used as a set, of resource already seen
1665: $self->{ALREADY_SEEN} = shift;
1666: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1667: $self->{CONDITION} = shift;
1668:
1.116 bowersj2 1669: # Do we want to automatically follow "redirection" maps?
1670: $self->{FORCE_TOP} = shift;
1671:
1.94 bowersj2 1672: # Now, we need to pre-process the map, by walking forward and backward
1673: # over the parts of the map we're going to look at.
1.96 bowersj2 1674:
1.97 bowersj2 1675: # The processing steps are exactly the same, except for a few small
1676: # changes, so I bundle those up in the following list of two elements:
1677: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
1678: # first_resource).
1679: # This prevents writing nearly-identical code twice.
1680: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
1681: 'FIRST_RESOURCE'],
1682: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
1683: 'FINISH_RESOURCE'] );
1684:
1.98 bowersj2 1685: my $maxDepth = 0; # tracks max depth
1686:
1.116 bowersj2 1687: # If there is only one resource in this map, and it's a map, we
1688: # want to remember that, so the user can ask for the first map
1689: # that isn't just a redirector.
1690: my $resource; my $resourceCount = 0;
1691:
1.107 bowersj2 1692: # **1**
1693:
1.97 bowersj2 1694: foreach my $pass (@iterations) {
1695: my $direction = $pass->[0];
1696: my $valName = $pass->[1];
1697: my $nextResourceMethod = $pass->[2];
1698: my $firstResourceName = $pass->[3];
1699:
1700: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
1701: $self->{FIRST_RESOURCE},
1702: $self->{FINISH_RESOURCE},
1703: {}, undef, 0, $direction);
1.96 bowersj2 1704:
1.97 bowersj2 1705: # prime the recursion
1706: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 bowersj2 1707: my $depth = 0;
1.97 bowersj2 1708: $iterator->next();
1709: my $curRes = $iterator->next();
1.98 bowersj2 1710: while ($depth > -1) {
1.97 bowersj2 1711: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
1712: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 1713:
1.97 bowersj2 1714: if (ref($curRes)) {
1.116 bowersj2 1715: # If there's only one resource, this will save it
1.117 bowersj2 1716: # we have to filter empty resources from consideration here,
1717: # or even "empty", redirecting maps have two (start & finish)
1718: # or three (start, finish, plus redirector)
1719: if($direction == FORWARD && $curRes->src()) {
1720: $resource = $curRes; $resourceCount++;
1721: }
1.97 bowersj2 1722: my $resultingVal = $curRes->{DATA}->{$valName};
1723: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 1724: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 1725:
1.116 bowersj2 1726: if ($nextCount == 1) { # **3**
1.97 bowersj2 1727: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
1728: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
1729: }
1730:
1.116 bowersj2 1731: if ($nextCount > 1) { # **4**
1.97 bowersj2 1732: foreach my $res (@{$nextResources}) {
1733: my $current = $res->{DATA}->{$valName} || 999999999;
1734: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
1735: }
1736: }
1737: }
1.96 bowersj2 1738:
1.107 bowersj2 1739: # Assign the final val (**2**)
1.97 bowersj2 1740: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 1741: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
1742: $curRes->{DATA}->{BOT_UP_VAL});
1743:
1744: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
1745: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1746: }
1.97 bowersj2 1747: $curRes = $iterator->next();
1.96 bowersj2 1748: }
1749: }
1.94 bowersj2 1750:
1.116 bowersj2 1751: # Check: Was this only one resource, a map?
1752: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
1753: my $firstResource = $resource->map_start();
1754: my $finishResource = $resource->map_finish();
1755: return
1756: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1757: $finishResource, $self->{FILTER},
1758: $self->{ALREADY_SEEN},
1759: $self->{CONDITION}, 0);
1760:
1761: }
1762:
1.98 bowersj2 1763: # Set up some bookkeeping information.
1764: $self->{CURRENT_DEPTH} = 0;
1765: $self->{MAX_DEPTH} = $maxDepth;
1766: $self->{STACK} = [];
1767: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1768:
1769: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
1770: push @{$self->{STACK}}, [];
1771: }
1772:
1.107 bowersj2 1773: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 1774: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
1775: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
1776:
1777: bless ($self);
1778:
1779: return $self;
1780: }
1781:
1782: sub next {
1783: my $self = shift;
1784:
1785: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1786: # grab the next from the recursive iterator
1787: my $next = $self->{RECURSIVE_ITERATOR}->next();
1788:
1789: # is it a begin or end map? If so, update the depth
1790: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
1791: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
1792:
1793: # Are we back at depth 0? If so, stop recursing
1794: if ($self->{RECURSIVE_DEPTH} == 0) {
1795: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1796: }
1797:
1798: return $next;
1799: }
1800:
1801: if (defined($self->{FORCE_NEXT})) {
1802: my $tmp = $self->{FORCE_NEXT};
1803: $self->{FORCE_NEXT} = undef;
1804: return $tmp;
1805: }
1806:
1807: # Have we not yet begun? If not, return BEGIN_MAP and
1808: # remember we've started.
1809: if ( !$self->{STARTED} ) {
1810: $self->{STARTED} = 1;
1811: return $self->BEGIN_MAP();
1812: }
1813:
1814: # Here's the guts of the iterator.
1815:
1816: # Find the next resource, if any.
1817: my $found = 0;
1818: my $i = $self->{MAX_DEPTH};
1819: my $newDepth;
1820: my $here;
1821: while ( $i >= 0 && !$found ) {
1.107 bowersj2 1822: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
1823: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 1824: $found = 1;
1825: $newDepth = $i;
1826: }
1827: $i--;
1828: }
1829:
1830: # If we still didn't find anything, we're done.
1831: if ( !$found ) {
1832: # We need to get back down to the correct branch depth
1833: if ( $self->{CURRENT_DEPTH} > 0 ) {
1834: $self->{CURRENT_DEPTH}--;
1835: return END_BRANCH();
1836: } else {
1837: return END_MAP();
1838: }
1839: }
1840:
1.104 bowersj2 1841: # If this is not a resource, it must be an END_BRANCH marker we want
1842: # to return directly.
1.107 bowersj2 1843: if (!ref($here)) { # **8**
1.104 bowersj2 1844: if ($here == END_BRANCH()) { # paranoia, in case of later extension
1845: $self->{CURRENT_DEPTH}--;
1846: return $here;
1847: }
1848: }
1849:
1850: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
1851: $self->{HERE} = $here;
1852:
1.98 bowersj2 1853: # Get to the right level
1854: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
1855: push @{$self->{STACK}->[$newDepth]}, $here;
1856: $self->{CURRENT_DEPTH}--;
1857: return END_BRANCH();
1858: }
1859: if ( $self->{CURRENT_DEPTH} < $newDepth) {
1860: push @{$self->{STACK}->[$newDepth]}, $here;
1861: $self->{CURRENT_DEPTH}++;
1862: return BEGIN_BRANCH();
1863: }
1864:
1865: # If we made it here, we have the next resource, and we're at the
1866: # right branch level. So let's examine the resource for where
1867: # we can get to from here.
1868:
1869: # So we need to look at all the resources we can get to from here,
1870: # categorize them if we haven't seen them, remember if we have a new
1871: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 1872: my $maxDepthAdded = -1;
1873:
1.98 bowersj2 1874: for (@$nextUnfiltered) {
1875: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 1876: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
1877: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 1878: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 1879: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 1880: }
1881: }
1.104 bowersj2 1882:
1883: # Is this the end of a branch? If so, all of the resources examined above
1884: # led to lower levels then the one we are currently at, so we push a END_BRANCH
1885: # marker onto the stack so we don't forget.
1886: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
1887: # BC branch and gets to C, it will see F as the only next resource, but it's
1888: # one level lower. Thus, this is the end of the branch, since there are no
1889: # more resources added to this level or above.
1.111 bowersj2 1890: # We don't do this if the examined resource is the finish resource,
1891: # because the condition given above is true, but the "END_MAP" will
1892: # take care of things and we should already be at depth 0.
1.104 bowersj2 1893: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 1894: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 1895: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
1896: }
1897:
1.98 bowersj2 1898: # That ends the main iterator logic. Now, do we want to recurse
1899: # down this map (if this resource is a map)?
1900: if ($self->{HERE}->is_map() &&
1901: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1902: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
1903: my $firstResource = $self->{HERE}->map_start();
1904: my $finishResource = $self->{HERE}->map_finish();
1905:
1906: $self->{RECURSIVE_ITERATOR} =
1907: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1908: $finishResource, $self->{FILTER},
1909: $self->{ALREADY_SEEN}, $self->{CONDITION});
1910: }
1911:
1.116 bowersj2 1912: # If this is a blank resource, don't actually return it.
1.117 bowersj2 1913: # Should you ever find you need it, make sure to add an option to the code
1914: # that you can use; other things depend on this behavior.
1.138 bowersj2 1915: my $browsePriv = $self->{HERE}->browsePriv();
1916: if (!$self->{HERE}->src() ||
1917: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.116 bowersj2 1918: return $self->next();
1919: }
1920:
1.98 bowersj2 1921: return $self->{HERE};
1922:
1923: }
1924:
1925: =pod
1926:
1927: The other method available on the iterator is B<getStack>, which returns an array populated with the current 'stack' of maps, as references to the resource objects. Example: This is useful when making the navigation map, as we need to check whether we are under a page map to see if we need to link directly to the resource, or to the page. The first elements in the array will correspond to the top of the stack (most inclusive map).
1928:
1929: =cut
1930:
1931: sub getStack {
1932: my $self=shift;
1933:
1934: my @stack;
1935:
1936: $self->populateStack(\@stack);
1937:
1938: return \@stack;
1939: }
1940:
1941: # Private method: Calls the iterators recursively to populate the stack.
1942: sub populateStack {
1943: my $self=shift;
1944: my $stack = shift;
1945:
1946: push @$stack, $self->{HERE} if ($self->{HERE});
1947:
1948: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1949: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
1950: }
1.94 bowersj2 1951: }
1952:
1953: 1;
1954:
1955: package Apache::lonnavmaps::DFSiterator;
1956:
1.100 bowersj2 1957: # Not documented in the perldoc: This is a simple iterator that just walks
1958: # through the nav map and presents the resources in a depth-first search
1959: # fashion, ignorant of conditionals, randomized resources, etc. It presents
1960: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
1961: # useful for pre-processing of some kind, and is in fact used by the main
1962: # iterator that way, but that's about it.
1963: # One could imagine merging this into the init routine of the main iterator,
1964: # but this might as well be left seperate, since it is possible some other
1965: # use might be found for it. - Jeremy
1.94 bowersj2 1966:
1.117 bowersj2 1967: # Unlike the main iterator, this DOES return all resources, even blank ones.
1968: # The main iterator needs them to correctly preprocess the map.
1969:
1.94 bowersj2 1970: sub BEGIN_MAP { return 1; } # begining of a new map
1971: sub END_MAP { return 2; } # end of the map
1972: sub FORWARD { return 1; } # go forward
1973: sub BACKWARD { return 2; }
1974:
1.100 bowersj2 1975: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
1976: # filter hash ref (or undef), already seen hash or undef, condition
1977: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 1978: sub new {
1979: # magic invocation to create a class instance
1980: my $proto = shift;
1981: my $class = ref($proto) || $proto;
1982: my $self = {};
1983:
1984: $self->{NAV_MAP} = shift;
1985: return undef unless ($self->{NAV_MAP});
1986:
1987: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1988: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1989:
1990: # If the given resources are just the ID of the resource, get the
1991: # objects
1992: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1993: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1994: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1995: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1996:
1997: $self->{FILTER} = shift;
1998:
1999: # A hash, used as a set, of resource already seen
2000: $self->{ALREADY_SEEN} = shift;
1.140 bowersj2 2001: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 2002: $self->{CONDITION} = shift;
1.89 bowersj2 2003: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 2004:
1.100 bowersj2 2005: # Flag: Have we started yet?
1.51 bowersj2 2006: $self->{STARTED} = 0;
2007:
2008: # Should we continue calling the recursive iterator, if any?
2009: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2010: # The recursive iterator, if any
2011: $self->{RECURSIVE_ITERATOR} = undef;
2012: # Are we recursing on a map, or a branch?
2013: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2014: # And the count of how deep it is, so that this iterator can keep track of
2015: # when to pick back up again.
2016: $self->{RECURSIVE_DEPTH} = 0;
2017:
2018: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 2019: $self->{STACK} = [];
1.51 bowersj2 2020:
2021: # Start with the first resource
1.89 bowersj2 2022: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 2023: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 2024: } else {
1.100 bowersj2 2025: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 2026: }
1.51 bowersj2 2027:
2028: bless($self);
2029: return $self;
2030: }
2031:
2032: sub next {
2033: my $self = shift;
2034:
2035: # Are we using a recursive iterator? If so, pull from that and
2036: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 2037: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 2038: # grab the next from the recursive iterator
2039: my $next = $self->{RECURSIVE_ITERATOR}->next();
2040:
2041: # is it a begin or end map? Update depth if so
2042: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2043: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2044:
2045: # Are we back at depth 0? If so, stop recursing.
2046: if ($self->{RECURSIVE_DEPTH} == 0) {
2047: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2048: }
2049:
2050: return $next;
2051: }
2052:
2053: # Is there a current resource to grab? If not, then return
1.100 bowersj2 2054: # END_MAP, which will end the iterator.
2055: if (scalar(@{$self->{STACK}}) == 0) {
2056: return $self->END_MAP();
1.51 bowersj2 2057: }
2058:
2059: # Have we not yet begun? If not, return BEGIN_MAP and
2060: # remember that we've started.
2061: if ( !$self->{STARTED} ) {
2062: $self->{STARTED} = 1;
2063: return $self->BEGIN_MAP;
2064: }
2065:
2066: # Get the next resource in the branch
1.100 bowersj2 2067: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 2068:
1.100 bowersj2 2069: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 2070: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2071:
2072: # Get the next possible resources
1.90 bowersj2 2073: my $nextUnfiltered;
1.89 bowersj2 2074: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 2075: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 2076: } else {
1.90 bowersj2 2077: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 2078: }
1.51 bowersj2 2079: my $next = [];
2080:
2081: # filter the next possibilities to remove things we've
1.100 bowersj2 2082: # already seen.
1.51 bowersj2 2083: foreach (@$nextUnfiltered) {
1.52 bowersj2 2084: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2085: push @$next, $_;
2086: }
1.51 bowersj2 2087: }
2088:
2089: while (@$next) {
1.100 bowersj2 2090: # copy the next possibilities over to the stack
2091: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 2092: }
2093:
2094: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 2095: if ($self->{HERE}->is_map() &&
1.63 bowersj2 2096: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 2097: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2098: my $firstResource = $self->{HERE}->map_start();
2099: my $finishResource = $self->{HERE}->map_finish();
2100:
2101: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 2102: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 2103: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 2104: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 2105: }
2106:
2107: return $self->{HERE};
2108: }
2109:
1.1 www 2110: 1;
1.2 www 2111:
1.51 bowersj2 2112: package Apache::lonnavmaps::resource;
2113:
2114: use Apache::lonnet;
2115:
2116: =pod
2117:
2118: =head1 Object: resource
2119:
2120: A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
2121:
2122: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
2123:
1.140 bowersj2 2124: You will probably never need to instantiate this object directly. Use Apache::lonnavmaps::navmap, and use the "start" method to obtain the starting resource.
1.51 bowersj2 2125:
2126: =head2 Public Members
2127:
2128: resource objects have a hash called DATA ($resourceRef->{DATA}) that you can store whatever you want in. This allows you to easily do two-pass algorithms without worrying about managing your own resource->data hash.
2129:
2130: =head2 Methods
2131:
2132: =over 4
2133:
1.70 bowersj2 2134: =item * B<new>($navmapRef, $idString): The first arg is a reference to the parent navmap object. The second is the idString of the resource itself. Very rarely, if ever, called directly. Use the nav map->getByID() method.
2135:
2136: =back
1.51 bowersj2 2137:
2138: =cut
2139:
2140: sub new {
2141: # magic invocation to create a class instance
2142: my $proto = shift;
2143: my $class = ref($proto) || $proto;
2144: my $self = {};
2145:
2146: $self->{NAV_MAP} = shift;
2147: $self->{ID} = shift;
2148:
2149: # Store this new resource in the parent nav map's cache.
2150: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 2151: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 2152:
2153: # A hash that can be used by two-pass algorithms to store data
2154: # about this resource in. Not used by the resource object
2155: # directly.
2156: $self->{DATA} = {};
2157:
2158: bless($self);
2159:
2160: return $self;
2161: }
2162:
1.70 bowersj2 2163: # private function: simplify the NAV_HASH lookups we keep doing
2164: # pass the name, and to automatically append my ID, pass a true val on the
2165: # second param
2166: sub navHash {
2167: my $self = shift;
2168: my $param = shift;
2169: my $id = shift;
1.115 bowersj2 2170: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 2171: }
2172:
1.51 bowersj2 2173: =pod
2174:
1.70 bowersj2 2175: B<Metadata Retreival>
2176:
1.101 bowersj2 2177: These are methods that help you retrieve metadata about the resource: Method names are based on the fields in the compiled course representation.
1.70 bowersj2 2178:
2179: =over 4
2180:
1.106 bowersj2 2181: =item * B<compTitle>: Returns a "composite title", that is equal to $res->title() if the resource has a title, and is otherwise the last part of the URL (e.g., "problem.problem").
2182:
1.70 bowersj2 2183: =item * B<ext>: Returns true if the resource is external.
2184:
2185: =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
2186:
2187: =item * B<kind>: Returns the kind of the resource from the compiled nav map.
2188:
1.101 bowersj2 2189: =item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature. In other words, this is usually false.
1.51 bowersj2 2190:
1.70 bowersj2 2191: =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
2192:
2193: =item * B<src>: Returns the source for the resource.
2194:
2195: =item * B<symb>: Returns the symb for the resource.
2196:
2197: =item * B<title>: Returns the title of the resource.
2198:
2199: =item * B<to>: Returns the "to" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
1.51 bowersj2 2200:
2201: =back
2202:
2203: =cut
2204:
2205: # These info functions can be used directly, as they don't return
2206: # resource information.
1.85 bowersj2 2207: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 2208: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 2209: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 2210: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2211: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 2212: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2213: sub randompick {
2214: my $self = shift;
2215: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2216: '.0.parameter_randompick'};
2217: }
1.51 bowersj2 2218: sub src {
2219: my $self=shift;
2220: return $self->navHash("src_", 1);
2221: }
2222: sub symb {
2223: my $self=shift;
2224: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2225: my $symbSrc = &Apache::lonnet::declutter($self->src());
2226: return &Apache::lonnet::declutter(
2227: $self->navHash('map_id_'.$first))
2228: . '___' . $second . '___' . $symbSrc;
2229: }
1.70 bowersj2 2230: sub title { my $self=shift; return $self->navHash("title_", 1); }
2231: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 2232: sub compTitle {
2233: my $self = shift;
2234: my $title = $self->title();
2235: if (!$title) {
2236: $title = $self->src();
2237: $title = substr($title, rindex($title, '/') + 1);
2238: }
2239: return $title;
2240: }
1.70 bowersj2 2241: =pod
2242:
2243: B<Predicate Testing the Resource>
2244:
2245: These methods are shortcuts to deciding if a given resource has a given property.
2246:
2247: =over 4
2248:
2249: =item * B<is_map>: Returns true if the resource is a map type.
2250:
2251: =item * B<is_problem>: Returns true if the resource is a problem type, false otherwise. (Looks at the extension on the src field; might need more to work correctly.)
2252:
2253: =item * B<is_page>: Returns true if the resource is a page.
2254:
1.101 bowersj2 2255: =item * B<is_sequence>: Returns true if the resource is a sequence.
1.70 bowersj2 2256:
2257: =back
2258:
2259: =cut
2260:
2261:
2262: sub is_html {
1.51 bowersj2 2263: my $self=shift;
2264: my $src = $self->src();
1.70 bowersj2 2265: return ($src =~ /html$/);
1.51 bowersj2 2266: }
1.70 bowersj2 2267: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2268: sub is_page {
1.51 bowersj2 2269: my $self=shift;
2270: my $src = $self->src();
1.70 bowersj2 2271: return ($src =~ /page$/);
1.51 bowersj2 2272: }
1.70 bowersj2 2273: sub is_problem {
1.51 bowersj2 2274: my $self=shift;
2275: my $src = $self->src();
1.70 bowersj2 2276: return ($src =~ /problem$/);
1.51 bowersj2 2277: }
1.70 bowersj2 2278: sub is_sequence {
1.51 bowersj2 2279: my $self=shift;
2280: my $src = $self->src();
1.70 bowersj2 2281: return ($src =~ /sequence$/);
1.51 bowersj2 2282: }
2283:
1.101 bowersj2 2284: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 2285: sub parmval {
2286: my $self = shift;
2287: my $what = shift;
2288: my $part = shift || "0";
2289: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2290: }
2291:
1.70 bowersj2 2292: =pod
2293:
2294: B<Map Methods>
2295:
2296: These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
2297:
2298: =over 4
2299:
2300: =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
2301:
2302: =item * B<map_pc>: Returns the pc value of the map, which is the first number that appears in the resource ID of the resources in the map, and is the number that appears around the middle of the symbs of the resources in that map.
2303:
2304: =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
2305:
2306: =item * B<map_type>: Returns a string with the type of the map in it.
2307:
2308: =back
1.51 bowersj2 2309:
1.70 bowersj2 2310: =cut
1.51 bowersj2 2311:
2312: sub map_finish {
2313: my $self = shift;
2314: my $src = $self->src();
2315: my $res = $self->navHash("map_finish_$src", 0);
2316: $res = $self->{NAV_MAP}->getById($res);
2317: return $res;
2318: }
1.70 bowersj2 2319: sub map_pc {
2320: my $self = shift;
2321: my $src = $self->src();
2322: return $self->navHash("map_pc_$src", 0);
2323: }
1.51 bowersj2 2324: sub map_start {
2325: my $self = shift;
2326: my $src = $self->src();
2327: my $res = $self->navHash("map_start_$src", 0);
2328: $res = $self->{NAV_MAP}->getById($res);
2329: return $res;
2330: }
2331: sub map_type {
2332: my $self = shift;
2333: my $pc = $self->map_pc();
2334: return $self->navHash("map_type_$pc", 0);
2335: }
2336:
2337:
2338:
2339: #####
2340: # Property queries
2341: #####
2342:
2343: # These functions will be responsible for returning the CORRECT
2344: # VALUE for the parameter, no matter what. So while they may look
2345: # like direct calls to parmval, they can be more then that.
2346: # So, for instance, the duedate function should use the "duedatetype"
2347: # information, rather then the resource object user.
2348:
2349: =pod
2350:
2351: =head2 Resource Parameters
2352:
1.70 bowersj2 2353: In order to use the resource parameters correctly, the nav map must have been instantiated with genCourseAndUserOptions set to true, so the courseopt and useropt is read correctly. Then, you can call these functions to get the relevant parameters for the resource. Each function defaults to part "0", but can be directed to another part by passing the part as the parameter.
1.51 bowersj2 2354:
2355: These methods are responsible for getting the parameter correct, not merely reflecting the contents of the GDBM hashes. As we move towards dates relative to other dates, these methods should be updated to reflect that. (Then, anybody using these methods won't have to update their code.)
2356:
2357: =over 4
2358:
2359: =item * B<acc>: Get the Client IP/Name Access Control information.
2360:
2361: =item * B<answerdate>: Get the answer-reveal date for the problem.
2362:
2363: =item * B<duedate>: Get the due date for the problem.
2364:
2365: =item * B<tries>: Get the number of tries the student has used on the problem.
2366:
2367: =item * B<maxtries>: Get the number of max tries allowed.
2368:
2369: =item * B<opendate>: Get the open date for the problem.
2370:
2371: =item * B<sig>: Get the significant figures setting.
2372:
2373: =item * B<tol>: Get the tolerance for the problem.
2374:
1.70 bowersj2 2375: =item * B<tries>: Get the number of tries the user has already used on the problem.
2376:
1.51 bowersj2 2377: =item * B<type>: Get the question type for the problem.
2378:
2379: =item * B<weight>: Get the weight for the problem.
2380:
2381: =back
2382:
2383: =cut
2384:
2385: sub acc {
2386: (my $self, my $part) = @_;
2387: return $self->parmval("acc", $part);
2388: }
2389: sub answerdate {
2390: (my $self, my $part) = @_;
2391: # Handle intervals
2392: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2393: return $self->duedate($part) +
2394: $self->parmval("answerdate", $part);
2395: }
2396: return $self->parmval("answerdate", $part);
1.106 bowersj2 2397: }
1.108 bowersj2 2398: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
1.51 bowersj2 2399: sub duedate {
2400: (my $self, my $part) = @_;
2401: return $self->parmval("duedate", $part);
2402: }
2403: sub maxtries {
2404: (my $self, my $part) = @_;
2405: return $self->parmval("maxtries", $part);
2406: }
2407: sub opendate {
2408: (my $self, my $part) = @_;
2409: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2410: return $self->duedate($part) -
2411: $self->parmval("opendate", $part);
2412: }
2413: return $self->parmval("opendate");
2414: }
2415: sub sig {
2416: (my $self, my $part) = @_;
2417: return $self->parmval("sig", $part);
2418: }
2419: sub tol {
2420: (my $self, my $part) = @_;
2421: return $self->parmval("tol", $part);
2422: }
1.108 bowersj2 2423: sub tries {
2424: my $self = shift;
2425: my $tries = $self->queryRestoreHash('tries', shift);
2426: if (!defined($tries)) { return '0';}
1.51 bowersj2 2427: return $tries;
2428: }
1.70 bowersj2 2429: sub type {
2430: (my $self, my $part) = @_;
2431: return $self->parmval("type", $part);
2432: }
1.109 bowersj2 2433: sub weight {
2434: my $self = shift; my $part = shift;
1.70 bowersj2 2435: return $self->parmval("weight", $part);
2436: }
1.51 bowersj2 2437:
2438: # Multiple things need this
2439: sub getReturnHash {
2440: my $self = shift;
2441:
2442: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 2443: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 2444: $self->{RETURN_HASH} = \%tmpHash;
2445: }
2446: }
2447:
2448: ######
2449: # Status queries
2450: ######
2451:
2452: # These methods query the status of problems.
2453:
2454: # If we need to count parts, this function determines the number of
2455: # parts from the metadata. When called, it returns a reference to a list
2456: # of strings corresponding to the parts. (Thus, using it in a scalar context
2457: # tells you how many parts you have in the problem:
2458: # $partcount = scalar($resource->countParts());
2459: # Don't use $self->{PARTS} directly because you don't know if it's been
2460: # computed yet.
2461:
2462: =pod
2463:
2464: =head2 Resource misc
2465:
2466: Misc. functions for the resource.
2467:
2468: =over 4
2469:
1.59 bowersj2 2470: =item * B<hasDiscussion>: Returns a false value if there has been discussion since the user last logged in, true if there has. Always returns false if the discussion data was not extracted when the nav map was constructed.
2471:
2472: =item * B<getFeedback>: Gets the feedback for the resource and returns the raw feedback string for the resource, or the null string if there is no feedback or the email data was not extracted when the nav map was constructed. Usually used like this:
2473:
2474: for (split(/\,/, $res->getFeedback())) {
2475: my $link = &Apache::lonnet::escape($_);
2476: ...
2477:
2478: and use the link as appropriate.
2479:
2480: =cut
2481:
2482: sub hasDiscussion {
2483: my $self = shift;
2484: return $self->{NAV_MAP}->hasDiscussion($self->symb());
2485: }
2486:
2487: sub getFeedback {
2488: my $self = shift;
1.124 bowersj2 2489: my $source = $self->src();
1.125 bowersj2 2490: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 2491: return $self->{NAV_MAP}->getFeedback($source);
2492: }
2493:
2494: sub getErrors {
2495: my $self = shift;
2496: my $source = $self->src();
2497: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
2498: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 2499: }
2500:
2501: =pod
2502:
1.70 bowersj2 2503: =item * B<parts>(): Returns a list reference containing sorted strings corresponding to each part of the problem. To count the number of parts, use the list in a scalar context, and subtract one if greater then two. (One part problems have a part 0. Multi-parts have a part 0, plus a part for each part. Filtering part 0 if you want it is up to you.)
1.51 bowersj2 2504:
1.70 bowersj2 2505: =item * B<countParts>(): Returns the number of parts of the problem a student can answer. Thus, for single part problems, returns 1. For multipart, it returns the number of parts in the problem, not including psuedo-part 0. Thus, B<parts> may return an array with fewer parts in it then countParts might lead you to believe.
1.51 bowersj2 2506:
2507: =back
2508:
2509: =cut
2510:
2511: sub parts {
2512: my $self = shift;
2513:
1.67 bowersj2 2514: if ($self->ext) { return ['0']; }
2515:
1.51 bowersj2 2516: $self->extractParts();
2517: return $self->{PARTS};
2518: }
2519:
2520: sub countParts {
2521: my $self = shift;
2522:
2523: my $parts = $self->parts();
1.66 bowersj2 2524:
2525: if ($self->{RESOURCE_ERROR}) {
2526: return 0;
2527: }
2528:
2529: if (scalar(@{$parts}) < 2) { return 1;}
1.51 bowersj2 2530:
2531: return scalar(@{$parts}) - 1;
2532: }
2533:
2534: # Private function: Extracts the parts information and saves it
2535: sub extractParts {
2536: my $self = shift;
2537:
2538: return if ($self->{PARTS});
1.67 bowersj2 2539: return if ($self->ext);
1.51 bowersj2 2540:
2541: $self->{PARTS} = [];
2542:
1.82 bowersj2 2543: # Retrieve part count, if this is a problem
2544: if ($self->is_problem()) {
2545: my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys');
2546: if (!$metadata) {
2547: $self->{RESOURCE_ERROR} = 1;
2548: $self->{PARTS} = [];
2549: return;
2550: }
2551:
2552: foreach (split(/\,/,$metadata)) {
2553: if ($_ =~ /^parameter\_(.*)\_opendate$/) {
2554: push @{$self->{PARTS}}, $1;
2555: }
1.51 bowersj2 2556: }
1.82 bowersj2 2557:
2558:
2559: # Is this possible to do in one line? - Jeremy
2560: my @sortedParts = sort @{$self->{PARTS}};
2561: $self->{PARTS} = \@sortedParts;
1.51 bowersj2 2562: }
2563:
2564: return;
2565: }
2566:
2567: =pod
2568:
2569: =head2 Resource Status
2570:
1.101 bowersj2 2571: Problem resources have status information, reflecting their various dates and completion statuses.
1.51 bowersj2 2572:
2573: There are two aspects to the status: the date-related information and the completion information.
2574:
2575: Idiomatic usage of these two methods would probably look something like
2576:
2577: foreach ($resource->parts()) {
2578: my $dateStatus = $resource->getDateStatus($_);
2579: my $completionStatus = $resource->getCompletionStatus($_);
2580:
1.70 bowersj2 2581: or
2582:
2583: my $status = $resource->status($_);
2584:
1.51 bowersj2 2585: ... use it here ...
2586: }
2587:
1.101 bowersj2 2588: Which you use depends on exactly what you are looking for. The status() function has been optimized for the nav maps display and may not precisely match what you need elsewhere.
2589:
2590: The symbolic constants shown below can be accessed through the resource object: $res->OPEN.
2591:
1.51 bowersj2 2592: =over 4
2593:
1.70 bowersj2 2594: =item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:
1.51 bowersj2 2595:
2596: =back
2597:
2598: B<Date Codes>
2599:
2600: =over 4
2601:
2602: =item * B<OPEN_LATER>: The problem will be opened later.
2603:
2604: =item * B<OPEN>: Open and not yet due.
2605:
1.59 bowersj2 2606:
1.54 bowersj2 2607: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
2608:
2609: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51 bowersj2 2610:
2611: =item * B<ANSWER_OPEN>: The answer date is here.
2612:
2613: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
2614:
2615: =back
2616:
2617: =cut
2618:
2619: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 2620: sub OPEN_LATER { return 0; }
2621: sub OPEN { return 1; }
2622: sub PAST_DUE_NO_ANSWER { return 2; }
2623: sub PAST_DUE_ANSWER_LATER { return 3; }
2624: sub ANSWER_OPEN { return 4; }
2625: sub NOTHING_SET { return 5; }
2626: sub NETWORK_FAILURE { return 100; }
2627:
2628: # getDateStatus gets the date status for a given problem part.
2629: # Because answer date, due date, and open date are fully independent
2630: # (i.e., it is perfectly possible to *only* have an answer date),
2631: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
2632: # (past, future, none given). This function handles this with a decision
2633: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 2634:
2635: sub getDateStatus {
2636: my $self = shift;
2637: my $part = shift;
2638: $part = "0" if (!defined($part));
1.54 bowersj2 2639:
2640: # Always return network failure if there was one.
1.51 bowersj2 2641: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2642:
2643: my $now = time();
2644:
1.53 bowersj2 2645: my $open = $self->opendate($part);
2646: my $due = $self->duedate($part);
2647: my $answer = $self->answerdate($part);
2648:
2649: if (!$open && !$due && !$answer) {
2650: # no data on the problem at all
2651: # should this be the same as "open later"? think multipart.
2652: return $self->NOTHING_SET;
2653: }
1.59 bowersj2 2654: if (!$open || $now < $open) {return $self->OPEN_LATER}
2655: if (!$due || $now < $due) {return $self->OPEN}
2656: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
2657: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 2658: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 2659: }
2660:
2661: =pod
2662:
2663: B<>
2664:
2665: =over 4
2666:
2667: =item * B<getCompletionStatus>($part): ($part defaults to 0.) A convenience function that returns a symbolic constant telling you about the completion status of the part, with the following possible results:
2668:
2669: =back
2670:
2671: B<Completion Codes>
2672:
2673: =over 4
2674:
2675: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
2676:
2677: =item * B<INCORRECT>: Attempted, but wrong by student.
2678:
2679: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
2680:
2681: =item * B<CORRECT>: Correct or correct by instructor.
2682:
2683: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
2684:
2685: =item * B<EXCUSED>: Excused. Not yet implemented.
2686:
2687: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
2688:
1.69 bowersj2 2689: =item * B<ATTEMPTED>: Attempted, and not yet graded.
2690:
1.51 bowersj2 2691: =back
2692:
2693: =cut
2694:
1.53 bowersj2 2695: sub NOT_ATTEMPTED { return 10; }
2696: sub INCORRECT { return 11; }
2697: sub INCORRECT_BY_OVERRIDE { return 12; }
2698: sub CORRECT { return 13; }
2699: sub CORRECT_BY_OVERRIDE { return 14; }
2700: sub EXCUSED { return 15; }
1.69 bowersj2 2701: sub ATTEMPTED { return 16; }
1.51 bowersj2 2702:
2703: sub getCompletionStatus {
2704: my $self = shift;
2705: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2706:
1.108 bowersj2 2707: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 2708:
2709: # Left as seperate if statements in case we ever do more with this
2710: if ($status eq 'correct_by_student') {return $self->CORRECT;}
2711: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
2712: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
2713: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
2714: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 2715: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 2716: return $self->NOT_ATTEMPTED;
1.108 bowersj2 2717: }
2718:
2719: sub queryRestoreHash {
2720: my $self = shift;
2721: my $hashentry = shift;
2722: my $part = shift;
2723: $part = "0" if (!defined($part));
2724: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2725:
2726: $self->getReturnHash();
2727:
2728: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 2729: }
2730:
2731: =pod
2732:
2733: B<Composite Status>
2734:
1.101 bowersj2 2735: Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):
1.51 bowersj2 2736:
2737: =over 4
2738:
1.70 bowersj2 2739: =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
1.51 bowersj2 2740:
1.70 bowersj2 2741: =item * B<NOTHING_SET>: No dates have been set for this problem (part) at all. (Because only certain parts of a multi-part problem may be assigned, this can not be collapsed into "open later", as we don't know a given part will EVER be opened. For single part, this is the same as "OPEN_LATER".)
1.53 bowersj2 2742:
1.70 bowersj2 2743: =item * B<CORRECT>: For any reason at all, the part is considered correct.
1.51 bowersj2 2744:
1.70 bowersj2 2745: =item * B<EXCUSED>: For any reason at all, the problem is excused.
1.51 bowersj2 2746:
1.70 bowersj2 2747: =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
1.54 bowersj2 2748:
1.70 bowersj2 2749: =item * B<PAST_DUE_ANSWER_LATER>: The problem is past due, not considered correct, and an answer date in the future is set.
1.51 bowersj2 2750:
1.70 bowersj2 2751: =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
1.51 bowersj2 2752:
1.70 bowersj2 2753: =item * B<OPEN_LATER>: The problem is not yet open.
1.51 bowersj2 2754:
1.70 bowersj2 2755: =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
1.51 bowersj2 2756:
1.70 bowersj2 2757: =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
1.51 bowersj2 2758:
1.70 bowersj2 2759: =item * B<OPEN>: The item is open and not yet tried.
1.51 bowersj2 2760:
1.70 bowersj2 2761: =item * B<ATTEMPTED>: The problem has been attempted.
1.69 bowersj2 2762:
1.51 bowersj2 2763: =back
2764:
2765: =cut
2766:
2767: sub TRIES_LEFT { return 10; }
2768:
2769: sub status {
2770: my $self = shift;
2771: my $part = shift;
2772: if (!defined($part)) { $part = "0"; }
2773: my $completionStatus = $self->getCompletionStatus($part);
2774: my $dateStatus = $self->getDateStatus($part);
2775:
2776: # What we have is a two-dimensional matrix with 4 entries on one
2777: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 2778: # plus network failure and "no date data at all".
1.51 bowersj2 2779:
1.53 bowersj2 2780: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 2781:
2782: # There are a few whole rows we can dispose of:
1.53 bowersj2 2783: if ($completionStatus == CORRECT ||
2784: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.69 bowersj2 2785: return CORRECT;
2786: }
2787:
2788: if ($completionStatus == ATTEMPTED) {
2789: return ATTEMPTED;
1.53 bowersj2 2790: }
2791:
2792: # If it's EXCUSED, then return that no matter what
2793: if ($completionStatus == EXCUSED) {
2794: return EXCUSED;
1.51 bowersj2 2795: }
2796:
1.53 bowersj2 2797: if ($dateStatus == NOTHING_SET) {
2798: return NOTHING_SET;
1.51 bowersj2 2799: }
2800:
1.69 bowersj2 2801: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
2802: # by 4 matrix (date statuses).
1.51 bowersj2 2803:
1.54 bowersj2 2804: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 2805: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 2806: return $dateStatus;
1.51 bowersj2 2807: }
2808:
1.53 bowersj2 2809: if ($dateStatus == ANSWER_OPEN) {
2810: return ANSWER_OPEN;
1.51 bowersj2 2811: }
2812:
2813: # Now: (incorrect, incorrect_override, not_attempted) x
2814: # (open_later), (open)
2815:
1.53 bowersj2 2816: if ($dateStatus == OPEN_LATER) {
2817: return OPEN_LATER;
1.51 bowersj2 2818: }
2819:
2820: # If it's WRONG...
1.53 bowersj2 2821: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 2822: # and there are TRIES LEFT:
1.79 bowersj2 2823: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 2824: return TRIES_LEFT;
1.51 bowersj2 2825: }
1.53 bowersj2 2826: return INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 2827: }
2828:
2829: # Otherwise, it's untried and open
1.53 bowersj2 2830: return OPEN;
1.51 bowersj2 2831: }
2832:
2833: =pod
2834:
2835: =head2 Resource/Nav Map Navigation
2836:
2837: =over 4
2838:
1.101 bowersj2 2839: =item * B<getNext>(): Retreive an array of the possible next resources after this one. Always returns an array, even in the one- or zero-element case.
1.85 bowersj2 2840:
1.101 bowersj2 2841: =item * B<getPrevious>(): Retreive an array of the possible previous resources from this one. Always returns an array, even in the one- or zero-element case.
1.51 bowersj2 2842:
2843: =cut
2844:
2845: sub getNext {
2846: my $self = shift;
2847: my @branches;
2848: my $to = $self->to();
1.85 bowersj2 2849: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 2850: my $choice = $self->{NAV_MAP}->getById($branch);
2851: my $next = $choice->goesto();
2852: $next = $self->{NAV_MAP}->getById($next);
2853:
1.131 bowersj2 2854: push @branches, $next;
1.85 bowersj2 2855: }
2856: return \@branches;
2857: }
2858:
2859: sub getPrevious {
2860: my $self = shift;
2861: my @branches;
2862: my $from = $self->from();
2863: foreach my $branch ( split /,/, $from) {
2864: my $choice = $self->{NAV_MAP}->getById($branch);
2865: my $prev = $choice->comesfrom();
2866: $prev = $self->{NAV_MAP}->getById($prev);
2867:
1.131 bowersj2 2868: push @branches, $prev;
1.51 bowersj2 2869: }
2870: return \@branches;
1.131 bowersj2 2871: }
2872:
2873: sub browsePriv {
2874: my $self = shift;
2875: if (defined($self->{BROWSE_PRIV})) {
2876: return $self->{BROWSE_PRIV};
2877: }
2878:
2879: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 2880: }
2881:
2882: =pod
1.2 www 2883:
1.51 bowersj2 2884: =back
1.2 www 2885:
1.51 bowersj2 2886: =cut
1.2 www 2887:
1.51 bowersj2 2888: 1;
1.2 www 2889:
1.51 bowersj2 2890: __END__
1.2 www 2891:
2892:
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