Annotation of loncom/interface/lonnavmaps.pm, revision 1.129.2.3
1.72 bowersj2 1:
1.2 www 2: # The LearningOnline Network with CAPA
3: # Navigate Maps Handler
1.1 www 4: #
1.129.2.3! albertel 5: # $Id: lonnavmaps.pm,v 1.129.2.2 2003/03/20 20:40:42 albertel 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:
1.1 www 49: sub handler {
1.99 bowersj2 50: my $r = shift;
1.118 bowersj2 51: real_handler($r);
52: }
53:
54: sub real_handler {
55: my $r = shift;
1.2 www 56:
1.51 bowersj2 57: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
58:
59: # Handle header-only request
60: if ($r->header_only) {
61: if ($ENV{'browser.mathml'}) {
62: $r->content_type('text/xml');
63: } else {
64: $r->content_type('text/html');
65: }
66: $r->send_http_header;
67: return OK;
68: }
69:
70: # Send header, don't cache this page
71: if ($ENV{'browser.mathml'}) {
72: $r->content_type('text/xml');
73: } else {
74: $r->content_type('text/html');
75: }
76: &Apache::loncommon::no_cache($r);
77: $r->send_http_header;
78:
1.106 bowersj2 79: # Create the nav map
1.51 bowersj2 80: my $navmap = Apache::lonnavmaps::navmap->new(
81: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 82: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 83:
1.55 bowersj2 84:
85: if (!defined($navmap)) {
86: my $requrl = $r->uri;
87: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
88: return HTTP_NOT_ACCEPTABLE;
89: }
1.64 bowersj2 90:
1.111 bowersj2 91: $r->print("<html><head>\n");
1.118 bowersj2 92: $r->print("<title>Navigate Course Contents</title></head>");
1.111 bowersj2 93:
1.64 bowersj2 94: # Header
1.111 bowersj2 95: $r->print(&Apache::loncommon::bodytag('Navigate Course Contents','',
1.64 bowersj2 96: ''));
97: $r->print('<script>window.focus();</script>');
1.101 bowersj2 98:
1.124 bowersj2 99: $r->rflush();
100:
101: # Now that we've displayed some stuff to the user, init the navmap
102: $navmap->init();
103:
1.95 bowersj2 104: $r->print('<table border="0" cellpadding="2" cellspacing="0">');
1.64 bowersj2 105: my $date=localtime;
1.95 bowersj2 106: $r->print('<tr><td align="right" valign="bottom">Key: </td>');
1.101 bowersj2 107:
108: # Print discussions and feedback header
1.65 bowersj2 109: if ($navmap->{LAST_CHECK}) {
1.95 bowersj2 110: $r->print('<td align="center" valign="bottom"> '.
111: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1.73 bowersj2 112: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1.95 bowersj2 113: '</td><td align="center" valign="bottom"> '.
114: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
115: '</td>');
116: } else {
117: $r->print('<td align="center" valign="bottom"> '.
118: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
119: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
120: '</td>');
121: }
122: $r->print('</tr></table>');
1.101 bowersj2 123:
1.95 bowersj2 124: my $condition = 0;
125: if ($ENV{'form.condition'}) {
126: $condition = 1;
127: }
128:
1.118 bowersj2 129: # Determine where the "here" marker is and where the screen jumps to.
130: my $SYMB = 1; my $URL = 2; my $NOTHING = 3; # symbolic constants
131: my $hereType; # the type of marker, $SYMB, $URL, or $NOTHING
132: my $here; # the actual URL or SYMB for the here marker
133: my $jumpType; # The type of the thing we have a jump for, $SYMB or $URL
134: my $jump; # the SYMB/URL of the resource we need to jump to
135:
136: if ( $ENV{'form.alreadyHere'} ) { # we came from a user's manipulation of the nav page
137: # If this is a click on a folder or something, we want to preserve the "here"
138: # from the querystring, and get the new "jump" marker
139: $hereType = $ENV{'form.hereType'};
140: $here = $ENV{'form.here'};
141: $jumpType = $ENV{'form.jumpType'} || $NOTHING;
142: $jump = $ENV{'form.jump'};
143: } else { # the user is visiting the nav map from the remote
144: # We're coming from the remote. We have either a url, a symb, or nothing,
145: # and we need to figure out what.
146: # Preference: Symb
147:
148: if ($ENV{'form.symb'}) {
149: $hereType = $jumpType = $SYMB;
150: $here = $jump = $ENV{'form.symb'};
151: } elsif ($ENV{'form.postdata'}) {
152: # couldn't find a symb, is there a URL?
153: my $currenturl = $ENV{'form.postdata'};
154: $currenturl=~s/^http\:\/\///;
155: $currenturl=~s/^[^\/]+//;
156:
157: $hereType = $jumpType = $URL;
158: $here = $jump = $currenturl;
159: } else {
160: # Nothing
161: $hereType = $jumpType = $NOTHING;
162: }
163: }
1.110 bowersj2 164:
1.118 bowersj2 165:
1.110 bowersj2 166: # alreadyHere allows us to only open the maps necessary to view
167: # the current location once, while at the same time remembering
168: # the current location. Without that check, the user would never
169: # be able to close those maps; the user would close it, and the
170: # currenturl scan would re-open it.
1.118 bowersj2 171: my $queryAdd = "&alreadyHere=1";
1.110 bowersj2 172:
1.95 bowersj2 173: if ($condition) {
1.118 bowersj2 174: $r->print("<a href=\"navmaps?condition=0&filter=&$queryAdd" .
175: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
176: "\">Close All Folders</a>");
1.65 bowersj2 177: } else {
1.118 bowersj2 178: $r->print("<a href=\"navmaps?condition=1&filter=&$queryAdd" .
179: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
180: "\">Open All Folders</a>");
1.65 bowersj2 181: }
1.55 bowersj2 182:
1.95 bowersj2 183: $r->print('<br> ');
184: $r->rflush();
185:
1.55 bowersj2 186: # Check that it's defined
187: if (!($navmap->courseMapDefined())) {
188: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
189: '</body></html>');
190: return OK;
191: }
192:
1.51 bowersj2 193: # Grab a resource object so we have access to the constants; this
194: # is technically not proper, but should be harmless
195: my $res = $navmap->firstResource();
196:
1.101 bowersj2 197: # These are some data tables, which make it easy to change some of
198: # of the specific visualization parameters if desired.
199:
1.51 bowersj2 200: # Defines a status->color mapping, null string means don't color
201: my %colormap =
1.54 bowersj2 202: ( $res->NETWORK_FAILURE => '',
1.59 bowersj2 203: $res->CORRECT => '',
1.112 bowersj2 204: $res->EXCUSED => '#3333FF',
1.59 bowersj2 205: $res->PAST_DUE_ANSWER_LATER => '',
206: $res->PAST_DUE_NO_ANSWER => '',
1.112 bowersj2 207: $res->ANSWER_OPEN => '#006600',
1.54 bowersj2 208: $res->OPEN_LATER => '',
1.59 bowersj2 209: $res->TRIES_LEFT => '',
210: $res->INCORRECT => '',
211: $res->OPEN => '',
1.54 bowersj2 212: $res->NOTHING_SET => '' );
1.59 bowersj2 213: # And a special case in the nav map; what to do when the assignment
214: # is not yet done and due in less then 24 hours
1.86 bowersj2 215: my $hurryUpColor = "#FF0000";
1.59 bowersj2 216:
1.115 bowersj2 217: # Keep these mappings in sync with lonquickgrades, which uses the colors
218: # instead of the icons.
1.59 bowersj2 219: my %statusIconMap =
1.66 bowersj2 220: ( $res->NETWORK_FAILURE => '',
221: $res->NOTHING_SET => '',
222: $res->CORRECT => 'navmap.correct.gif',
223: $res->EXCUSED => 'navmap.correct.gif',
224: $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
225: $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
226: $res->ANSWER_OPEN => 'navmap.wrong.gif',
227: $res->OPEN_LATER => '',
228: $res->TRIES_LEFT => 'navmap.open.gif',
229: $res->INCORRECT => 'navmap.wrong.gif',
1.69 bowersj2 230: $res->OPEN => 'navmap.open.gif',
1.85 bowersj2 231: $res->ATTEMPTED => 'navmap.open.gif' );
1.69 bowersj2 232:
233: my %iconAltTags =
234: ( 'navmap.correct.gif' => 'Correct',
235: 'navmap.wrong.gif' => 'Incorrect',
236: 'navmap.open.gif' => 'Open' );
1.59 bowersj2 237:
238: my %condenseStatuses =
1.66 bowersj2 239: ( $res->NETWORK_FAILURE => 1,
240: $res->NOTHING_SET => 1,
241: $res->CORRECT => 1 );
1.51 bowersj2 242:
243: my %filterHash;
244: # Figure out what we're not displaying
245: foreach (split(/\,/, $ENV{"form.filter"})) {
246: if ($_) {
247: $filterHash{$_} = "1";
248: }
249: }
250:
1.88 bowersj2 251: # Is this a new-style course? If so, we want to suppress showing the top-level
252: # maps in their own folders, in favor of "inlining" them.
253: my $topResource = $navmap->getById("0.0");
1.63 bowersj2 254:
1.51 bowersj2 255: # Begin the HTML table
1.59 bowersj2 256: # four cols: resource + indent, chat+feedback, icon, text string
1.85 bowersj2 257: $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
1.51 bowersj2 258:
1.74 bowersj2 259: # This needs to be updated to use symbs from the remote,
260: # instead of uris. The changes to this and the main rendering
261: # loop should be obvious.
262: # Here's a simple example of the iterator.
1.88 bowersj2 263: # Preprocess the map: Look for current URL, force inlined maps to display
264:
1.118 bowersj2 265: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.88 bowersj2 266: my $found = 0;
267: my $depth = 1;
1.118 bowersj2 268: my $currentJumpIndex = 0; # keeps track of when the current resource is found,
1.91 bowersj2 269: # so we can back up a few and put the anchor above the
270: # current resource
1.118 bowersj2 271: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1.101 bowersj2 272: # before the current resource when using #current
1.88 bowersj2 273: $mapIterator->next(); # discard the first BEGIN_MAP
274: my $curRes = $mapIterator->next();
1.91 bowersj2 275: my $counter = 0;
1.118 bowersj2 276: my $foundJump = ($jumpType == $NOTHING); # look for jump point if we have one
277: my $looped = 0;
1.116 bowersj2 278:
279: # We only need to do this if we need to open the maps to show the
1.118 bowersj2 280: # current position. This will change the counter so we can't count
281: # for the jump marker with this loop.
1.116 bowersj2 282: while ($depth > 0 && !$ENV{'form.alreadyHere'}) {
1.96 bowersj2 283: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
284: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.120 bowersj2 285:
1.118 bowersj2 286: if (ref($curRes) && !$ENV{'form.alreadyHere'} &&
287: ($hereType == $SYMB && $curRes->symb() eq $here) ||
1.119 bowersj2 288: (ref($curRes) && $hereType == $URL && $curRes->src() eq $here)) {
1.118 bowersj2 289: my $mapStack = $mapIterator->getStack();
290:
291: # Ensure the parent maps are open
292: for my $map (@{$mapStack}) {
293: if ($condition) {
294: undef $filterHash{$map->map_pc()};
295: } else {
296: $filterHash{$map->map_pc()} = 1;
297: }
298: }
299: $ENV{'form.alreadyHere'} = 1;
300: }
301: $looped = 1;
302:
303: $curRes = $mapIterator->next();
304: }
305:
306: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 0);
307: $depth = 1;
308: $mapIterator->next();
309: $curRes = $mapIterator->next();
1.88 bowersj2 310:
1.118 bowersj2 311: while ($depth > 0 && !$foundJump) {
312: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
313: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.91 bowersj2 314: if (ref($curRes)) { $counter++; }
315:
1.118 bowersj2 316: if (ref($curRes) &&
317: (($jumpType == $SYMB && $curRes->symb() eq $jump) ||
318: ($jumpType == $URL && $curRes->src() eq $jump))) {
1.88 bowersj2 319: # If this is the correct resource, be sure to
320: # show it by making sure the containing maps
321: # are open.
1.91 bowersj2 322:
1.101 bowersj2 323: # This is why we have to use the main iterator instead of the
324: # potentially faster DFS: The count has to be the same, so
325: # the order has to be the same, which DFS won't give us.
1.118 bowersj2 326: $currentJumpIndex = $counter;
327: $foundJump = 1;
1.88 bowersj2 328: }
1.118 bowersj2 329:
1.88 bowersj2 330: $curRes = $mapIterator->next();
1.74 bowersj2 331: }
1.88 bowersj2 332:
1.53 bowersj2 333: undef $res; # so we don't accidentally use it later
1.72 bowersj2 334: my $indentLevel = 0;
1.61 bowersj2 335: my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";
1.51 bowersj2 336:
337: my $isNewBranch = 0;
1.59 bowersj2 338: my $now = time();
339: my $in24Hours = $now + 24 * 60 * 60;
1.78 bowersj2 340: my $displayedHereMarker = 0;
1.118 bowersj2 341: my $displayedJumpMarker = 0;
1.88 bowersj2 342:
1.72 bowersj2 343: # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
344: # code in iterator->next), so ignore the first one
1.89 bowersj2 345: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
1.74 bowersj2 346: $condition);
1.72 bowersj2 347: $mapIterator->next();
1.89 bowersj2 348: $curRes = $mapIterator->next();
1.90 bowersj2 349: $depth = 1;
1.88 bowersj2 350:
351: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
352: my $rowNum = 0;
1.51 bowersj2 353:
1.91 bowersj2 354: $counter = 0;
355:
1.72 bowersj2 356: while ($depth > 0) {
1.51 bowersj2 357: if ($curRes == $mapIterator->BEGIN_MAP() ||
1.52 bowersj2 358: $curRes == $mapIterator->BEGIN_BRANCH()) {
1.51 bowersj2 359: $indentLevel++;
360: }
361: if ($curRes == $mapIterator->END_MAP() ||
1.52 bowersj2 362: $curRes == $mapIterator->END_BRANCH()) {
1.51 bowersj2 363: $indentLevel--;
364: }
1.52 bowersj2 365: if ($curRes == $mapIterator->BEGIN_BRANCH()) {
366: $isNewBranch = 1;
1.72 bowersj2 367: }
1.96 bowersj2 368: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
369: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.51 bowersj2 370:
1.91 bowersj2 371: if (ref($curRes)) { $counter++; }
372:
1.101 bowersj2 373: # Is this resource being ignored because it is in a random-out
374: # map and it was not selected?
1.68 bowersj2 375: if (ref($curRes) && !advancedUser() && $curRes->randomout()) {
376: $curRes = $mapIterator->next();
1.101 bowersj2 377: next; # if yes, then just ignore this resource
1.68 bowersj2 378: }
379:
1.116 bowersj2 380: if (ref($curRes)) {
1.51 bowersj2 381:
1.113 bowersj2 382: my $deltalevel = $isNewBranch? 1 : 0; # reserves space for branch icon
383:
1.116 bowersj2 384: if ($indentLevel - $deltalevel < 0) {
1.113 bowersj2 385: # If this would be at a negative depth (top-level maps in
386: # new-style courses, we want to suppress their title display)
387: # then ignore it.
388: $curRes = $mapIterator->next();
389: next;
390: }
391:
1.66 bowersj2 392: # Step one: Decide which parts to show
393: my @parts = @{$curRes->parts()};
394: my $multipart = scalar(@parts) > 1;
395: my $condensed = 0;
396:
1.51 bowersj2 397: if ($curRes->is_problem()) {
1.101 bowersj2 398:
1.66 bowersj2 399: # Is it multipart?
400: if ($multipart) {
401: # If it's multipart, see if part 0 is "open"
402: # if it is, display all parts, if it isn't,
403: # just display first
404: if (!$curRes->opendate("0")) {
1.101 bowersj2 405: # no parts are open, display as one part
1.129.2.2 albertel 406: @parts = ();
1.68 bowersj2 407: $condensed = 1;
1.66 bowersj2 408: } else {
409: # Otherwise, only display part 0 if we want to
410: # attach feedback or email information to it
411: if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
1.129.2.3! albertel 412: #shift @parts;
1.66 bowersj2 413: } else {
414: # Now, we decide whether to condense the
415: # parts due to similarity
416: my $status = $curRes->status($parts[1]);
417: my $due = $curRes->duedate($parts[1]);
418: my $open = $curRes->opendate($parts[1]);
419: my $statusAllSame = 1;
420: my $dueAllSame = 1;
421: my $openAllSame = 1;
422: for (my $i = 2; $i < scalar(@parts); $i++) {
423: if ($curRes->status($parts[$i]) != $status){
424: $statusAllSame = 0;
425: }
426: if ($curRes->duedate($parts[$i]) != $due ) {
427: $dueAllSame = 0;
428: }
429: if ($curRes->opendate($parts[$i]) != $open) {
430: $openAllSame = 0;
431: }
432: }
433:
434: # $allSame is true if all the statuses were
435: # the same. Now, if they are all the same and
436: # match one of the statuses to condense, or they
437: # are all open with the same due date, or they are
438: # all OPEN_LATER with the same open date, display the
439: # status of the first non-zero part (to get the 'correct'
440: # status right, since 0 is never 'correct' or 'open').
441: if (($statusAllSame && defined($condenseStatuses{$status})) ||
442: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
443: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.129.2.2 albertel 444: @parts = ();
1.66 bowersj2 445: $condensed = 1;
446: }
447: }
448: }
449: }
1.59 bowersj2 450:
1.51 bowersj2 451: }
452:
1.83 bowersj2 453: # Is it a multipart problem with a single part, now in
1.101 bowersj2 454: # @parts with "0" filtered out? If so, 'forget' it's a multi-part
1.83 bowersj2 455: # problem and treat it like a single-part problem.
1.129.2.2 albertel 456: if ( scalar(@parts) == 0 ) {
1.83 bowersj2 457: $multipart = 0;
458: }
459:
1.66 bowersj2 460: # Display one part, in event of network error.
461: # If this is a single part, we can at least show the correct
1.101 bowersj2 462: # status, but if it's multipart, we're lost, since we can't
463: # retreive the metadata to count the parts
1.66 bowersj2 464: if ($curRes->{RESOURCE_ERROR}) {
1.129.2.2 albertel 465: @parts = ();
1.66 bowersj2 466: }
467:
1.101 bowersj2 468: # Step Two: Print the actual data.
469:
470: # For each part we intend to display...
1.129.2.2 albertel 471: foreach my $part ('', @parts) {
472: if ($part eq '0') {
473: next;
474: }
1.59 bowersj2 475:
1.68 bowersj2 476: my $nonLinkedText = ""; # unlinked stuff after title
1.51 bowersj2 477:
478: my $stack = $mapIterator->getStack();
479: my $src = getLinkForResource($stack);
480:
1.101 bowersj2 481: # Pass the correct symb on the querystring, so the
482: # remote will figure out where we are if we click a link
1.51 bowersj2 483: my $srcHasQuestion = $src =~ /\?/;
484: my $link = $src.
485: ($srcHasQuestion?'&':'?') .
486: 'symb='.&Apache::lonnet::escape($curRes->symb()).
487: '"';
1.101 bowersj2 488:
1.106 bowersj2 489: my $title = $curRes->compTitle();
1.122 www 490: if ($src=~/^\/uploaded\//) {
491: $nonLinkedText=$title;
492: $title='';
493: }
1.51 bowersj2 494: my $partLabel = "";
1.52 bowersj2 495: my $newBranchText = "";
496:
497: # If this is a new branch, label it so
498: if ($isNewBranch) {
1.59 bowersj2 499: $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
1.52 bowersj2 500: $isNewBranch = 0;
501: }
1.51 bowersj2 502:
503: # links to open and close the folders
504: my $linkopen = "<a href=\"$link\">";
505: my $linkclose = "</a>";
506:
1.61 bowersj2 507: my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";
1.51 bowersj2 508: if ($curRes->is_problem()) {
1.129.2.2 albertel 509: if ($part eq "" || $condensed) {
1.66 bowersj2 510: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />';
511: } else {
512: $icon = $indentString;
513: }
1.51 bowersj2 514: }
515:
516: # Display the correct icon, link to open or shut map
517: if ($curRes->is_map()) {
518: my $mapId = $curRes->map_pc();
1.82 bowersj2 519: my $nowOpen = (!defined($filterHash{$mapId}));
520: if ($condition) {$nowOpen = !$nowOpen;}
1.51 bowersj2 521: $icon = $nowOpen ?
1.77 bowersj2 522: "navmap.folder.closed.gif" : "navmap.folder.open.gif";
1.66 bowersj2 523: $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";
1.52 bowersj2 524: $linkopen = "<a href=\"/adm/navmaps?filter=";
1.66 bowersj2 525: $linkopen .= ($nowOpen xor $condition) ?
1.51 bowersj2 526: addToFilter(\%filterHash, $mapId) :
527: removeFromFilter(\%filterHash, $mapId);
1.118 bowersj2 528: $linkopen .= "&condition=$condition&$queryAdd" .
529: "&hereType=$hereType&here=" .
530: Apache::lonnet::escape($here) . "&jumpType=$SYMB&" .
531: "jump=" . Apache::lonnet::escape($curRes->symb()) ."\">";
1.51 bowersj2 532: $linkclose = "</a>";
1.68 bowersj2 533:
1.51 bowersj2 534: }
535:
536: my $colorizer = "";
1.86 bowersj2 537: my $color;
1.51 bowersj2 538: if ($curRes->is_problem()) {
1.115 bowersj2 539: $color = $colormap{$curRes->status};
1.74 bowersj2 540:
1.115 bowersj2 541: if (dueInLessThen24Hours($curRes, $part) ||
542: lastTry($curRes, $part)) {
1.79 bowersj2 543: $color = $hurryUpColor;
544: }
1.115 bowersj2 545:
1.51 bowersj2 546: if ($color ne "") {
547: $colorizer = "bgcolor=\"$color\"";
548: }
549: }
550:
1.68 bowersj2 551: if ($curRes->randomout()) {
552: $nonLinkedText .= ' <i>(hidden)</i> ';
553: }
554:
1.88 bowersj2 555: $rowNum++;
556: my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
557:
1.91 bowersj2 558: # FIRST COL: The resource indentation, branch icon, name, and anchor
1.116 bowersj2 559: $r->print(" <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\">\n");
1.51 bowersj2 560:
1.101 bowersj2 561: # Print the anchor if necessary
1.118 bowersj2 562: if ($counter == $currentJumpIndex - $currentJumpDelta ) {
563: $r->print('<a name="curloc" />');
564: $displayedJumpMarker = 1;
1.91 bowersj2 565: }
566:
1.51 bowersj2 567: # print indentation
1.116 bowersj2 568: for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {
1.51 bowersj2 569: $r->print($indentString);
570: }
571:
1.61 bowersj2 572: $r->print(" ${newBranchText}${linkopen}$icon${linkclose}\n");
1.51 bowersj2 573:
1.74 bowersj2 574: my $curMarkerBegin = "";
575: my $curMarkerEnd = "";
576:
577: # Is this the current resource?
1.118 bowersj2 578: if (!$displayedHereMarker &&
579: (($hereType == $SYMB && $curRes->symb eq $here) ||
580: ($hereType == $URL && $curRes->src eq $here))) {
581: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1.74 bowersj2 582: $curMarkerEnd = '<font color="red" size="+2"> <</font>';
1.78 bowersj2 583: $displayedHereMarker = 1;
1.74 bowersj2 584: }
585:
1.129.2.2 albertel 586: if ($curRes->is_problem() && $part ne "" && !$condensed) {
1.66 bowersj2 587: $partLabel = " (Part $part)";
588: $title = "";
589: }
1.129.2.2 albertel 590: if ($condensed && $curRes->countParts() > 1) {
1.68 bowersj2 591: $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';
1.66 bowersj2 592: }
1.59 bowersj2 593:
1.74 bowersj2 594: $r->print(" $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
1.66 bowersj2 595:
1.118 bowersj2 596: #if ($curRes->{RESOURCE_ERROR}) {
597: # $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
598: # '<font size="-1">Host down</font>'));
599: # }
1.66 bowersj2 600:
1.113 bowersj2 601: $r->print("</td>\n");
602:
1.101 bowersj2 603: # SECOND COL: Is there text, feedback, errors??
1.124 bowersj2 604: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1.66 bowersj2 605:
606: if ($curRes->hasDiscussion()) {
607: $discussionHTML = $linkopen .
608: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
609: $linkclose;
610: }
611:
612: if ($curRes->getFeedback()) {
613: my $feedback = $curRes->getFeedback();
614: foreach (split(/\,/, $feedback)) {
615: if ($_) {
616: $feedbackHTML .= ' <a href="/adm/email?display='
617: . &Apache::lonnet::escape($_) . '">'
618: . '<img src="/adm/lonMisc/feedback.gif" '
619: . 'border="0" /></a>';
620: }
621: }
622: }
623:
1.124 bowersj2 624: if ($curRes->getErrors()) {
625: my $errors = $curRes->getErrors();
626: foreach (split(/,/, $errors)) {
627: if ($_) {
628: $errorHTML .= ' <a href="/adm/email?display='
629: . &Apache::lonnet::escape($_) . '">'
630: . '<img src="/adm/lonMisc/bomb.gif" '
631: . 'border="0" /></a>';
632: }
633: }
634: }
635:
636: $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>");
1.66 bowersj2 637:
638: # Is this the first displayed part of a multi-part problem
639: # that has not been condensed, so we should suppress these two
1.101 bowersj2 640: # columns so we don't display useless status info about part
641: # "0"?
1.66 bowersj2 642: my $firstDisplayed = !$condensed && $multipart && $part eq "0";
643:
1.69 bowersj2 644: # THIRD COL: Problem status icon
1.66 bowersj2 645: if ($curRes->is_problem() &&
646: !$firstDisplayed) {
647: my $icon = $statusIconMap{$curRes->status($part)};
1.69 bowersj2 648: my $alt = $iconAltTags{$icon};
1.66 bowersj2 649: if ($icon) {
1.84 bowersj2 650: $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");
1.66 bowersj2 651: } else {
1.84 bowersj2 652: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 653: }
654: } else { # not problem, no icon
1.84 bowersj2 655: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 656: }
657:
1.69 bowersj2 658: # FOURTH COL: Text description
1.86 bowersj2 659: $r->print("<td align=\"right\" valign=\"center\">\n");
1.51 bowersj2 660:
1.61 bowersj2 661: if ($curRes->kind() eq "res" &&
662: $curRes->is_problem() &&
1.66 bowersj2 663: !$firstDisplayed) {
1.86 bowersj2 664: $r->print ("<font color=\"$color\"><b>") if ($color);
1.53 bowersj2 665: $r->print (getDescription($curRes, $part));
1.86 bowersj2 666: $r->print ("</b></font>") if ($color);
1.51 bowersj2 667: }
1.68 bowersj2 668: if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {
669: $r->print('(randomly select ' . $curRes->randompick() .')');
670: }
1.59 bowersj2 671:
1.84 bowersj2 672: $r->print(" </td></tr>\n");
1.113 bowersj2 673:
674: if (!($counter % 20)) { $r->rflush(); }
675: if ($counter == 2) { $r->rflush(); }
1.51 bowersj2 676: }
677: }
678: $curRes = $mapIterator->next();
679: }
680:
1.118 bowersj2 681: $r->print("</table>");
682:
683: # Print out the part that jumps to #curloc if it exists
684: if ($displayedJumpMarker) {
685: $r->print('<script>location += "#curloc";</script>');
686: }
687:
1.126 bowersj2 688: $navmap->untieHashes();
1.51 bowersj2 689:
1.128 bowersj2 690: $r->print("</body></html>");
1.59 bowersj2 691:
1.51 bowersj2 692: return OK;
693: }
694:
695: # Convenience functions: Returns a string that adds or subtracts
696: # the second argument from the first hash, appropriate for the
697: # query string that determines which folders to recurse on
698: sub addToFilter {
699: my $hashIn = shift;
700: my $addition = shift;
701: my %hash = %$hashIn;
702: $hash{$addition} = 1;
703:
704: return join (",", keys(%hash));
705: }
706:
707: sub removeFromFilter {
708: my $hashIn = shift;
709: my $subtraction = shift;
710: my %hash = %$hashIn;
711:
712: delete $hash{$subtraction};
713: return join(",", keys(%hash));
714: }
715:
716: # Convenience function: Given a stack returned from getStack on the iterator,
717: # return the correct src() value.
718: # Later, this should add an anchor when we start putting anchors in pages.
719: sub getLinkForResource {
720: my $stack = shift;
721: my $res;
722:
723: # Check to see if there are any pages in the stack
724: foreach $res (@$stack) {
725: if (defined($res) && $res->is_page()) {
726: return $res->src();
727: }
728: }
729:
730: # Failing that, return the src of the last resource that is defined
731: # (when we first recurse on a map, it puts an undefined resource
732: # on the bottom because $self->{HERE} isn't defined yet, and we
733: # want the src for the map anyhow)
734: foreach (@$stack) {
735: if (defined($_)) { $res = $_; }
736: }
737:
738: return $res->src();
739: }
740:
1.53 bowersj2 741: # Convenience function: This seperates the logic of how to create
742: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
743: # etc.) into a seperate function. It takes a resource object as the
744: # first parameter, and the part number of the resource as the second.
745: # It's basically a big switch statement on the status of the resource.
746:
747: sub getDescription {
748: my $res = shift;
749: my $part = shift;
1.69 bowersj2 750: my $status = $res->status($part);
1.53 bowersj2 751:
752: if ($status == $res->NETWORK_FAILURE) { return ""; }
753: if ($status == $res->NOTHING_SET) {
754: return "Not currently assigned.";
755: }
756: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 757: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 758: }
759: if ($status == $res->OPEN) {
1.79 bowersj2 760: if ($res->duedate($part)) {
1.73 bowersj2 761: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 762: } else {
763: return "Open, no due date";
764: }
1.53 bowersj2 765: }
1.54 bowersj2 766: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 767: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 768: }
769: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 770: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 771: }
772: if ($status == $res->ANSWER_OPEN) {
773: return "Answer available";
774: }
1.59 bowersj2 775: if ($status == $res->EXCUSED) {
1.66 bowersj2 776: return "Excused by instructor";
1.59 bowersj2 777: }
1.69 bowersj2 778: if ($status == $res->ATTEMPTED) {
779: return "Not yet graded.";
780: }
1.59 bowersj2 781: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 782: my $tries = $res->tries($part);
783: my $maxtries = $res->maxtries($part);
784: my $triesString = "";
785: if ($tries && $maxtries) {
786: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
787: if ($maxtries > 1 && $maxtries - $tries == 1) {
788: $triesString = "<b>$triesString</b>";
789: }
790: }
1.66 bowersj2 791: if ($res->duedate()) {
1.73 bowersj2 792: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 793: " $triesString";
794: } else {
795: return "No due date $triesString";
796: }
1.59 bowersj2 797: }
1.53 bowersj2 798: }
799:
1.115 bowersj2 800: # Convenience function, so others can use it: Is the problem due in less then
801: # 24 hours, and still can be done?
802:
803: sub dueInLessThen24Hours {
804: my $res = shift;
805: my $part = shift;
806: my $status = $res->status($part);
807:
808: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
809: $status == $res->TRIES_LEFT()) &&
810: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
811: $res->duedate() > time();
812: }
813:
814: # Convenience function, so others can use it: Is there only one try remaining for the
815: # part, with more then one try to begin with, not due yet and still can be done?
816: sub lastTry {
817: my $res = shift;
818: my $part = shift;
819:
820: my $tries = $res->tries($part);
821: my $maxtries = $res->maxtries($part);
822: return $tries && $maxtries && $maxtries > 1 &&
823: $maxtries - $tries == 1 && $res->duedate() &&
824: $res->duedate() > time();
825: }
826:
1.101 bowersj2 827: # This puts a human-readable name on the ENV variable.
1.68 bowersj2 828: sub advancedUser {
829: return $ENV{'user.adv'};
830: }
831:
1.73 bowersj2 832:
833: # timeToHumanString takes a time number and converts it to a
834: # human-readable representation, meant to be used in the following
835: # manner:
836: # print "Due $timestring"
837: # print "Open $timestring"
838: # print "Answer available $timestring"
839: # Very, very, very, VERY English-only... goodness help a localizer on
840: # this func...
1.53 bowersj2 841: sub timeToHumanString {
1.58 albertel 842: my ($time) = @_;
843: # zero, '0' and blank are bad times
1.73 bowersj2 844: if (!$time) {
845: return 'never';
846: }
847:
848: my $now = time();
849:
850: my @time = localtime($time);
851: my @now = localtime($now);
852:
853: # Positive = future
854: my $delta = $time - $now;
855:
856: my $minute = 60;
857: my $hour = 60 * $minute;
858: my $day = 24 * $hour;
859: my $week = 7 * $day;
860: my $inPast = 0;
861:
862: # Logic in comments:
863: # Is it now? (extremely unlikely)
864: if ( $delta == 0 ) {
865: return "this instant";
866: }
867:
868: if ($delta < 0) {
869: $inPast = 1;
870: $delta = -$delta;
871: }
872:
873: if ( $delta > 0 ) {
1.101 bowersj2 874:
1.73 bowersj2 875: my $tense = $inPast ? " ago" : "";
876: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 877:
878: # Less then a minute
1.73 bowersj2 879: if ( $delta < $minute ) {
880: if ($delta == 1) { return "${prefix}1 second$tense"; }
881: return "$prefix$delta seconds$tense";
882: }
883:
1.101 bowersj2 884: # Less then an hour
1.73 bowersj2 885: if ( $delta < $hour ) {
886: # If so, use minutes
887: my $minutes = floor($delta / 60);
888: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
889: return "$prefix$minutes minutes$tense";
890: }
891:
892: # Is it less then 24 hours away? If so,
893: # display hours + minutes
894: if ( $delta < $hour * 24) {
895: my $hours = floor($delta / $hour);
896: my $minutes = floor(($delta % $hour) / $minute);
897: my $hourString = "$hours hours";
898: my $minuteString = ", $minutes minutes";
899: if ($hours == 1) {
900: $hourString = "1 hour";
901: }
902: if ($minutes == 1) {
903: $minuteString = ", 1 minute";
904: }
905: if ($minutes == 0) {
906: $minuteString = "";
907: }
908: return "$prefix$hourString$minuteString$tense";
909: }
910:
911: # Less then 5 days away, display day of the week and
912: # HH:MM
913: if ( $delta < $day * 5 ) {
1.85 bowersj2 914: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 915: $timeStr =~ s/12:00 am/midnight/;
916: $timeStr =~ s/12:00 pm/noon/;
917: return ($inPast ? "last " : "next ") .
918: $timeStr;
919: }
920:
921: # Is it this year?
922: if ( $time[5] == $now[5]) {
923: # Return on Month Day, HH:MM meridian
924: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
925: $timeStr =~ s/12:00 am/midnight/;
926: $timeStr =~ s/12:00 pm/noon/;
927: return $timeStr;
928: }
929:
930: # Not this year, so show the year
931: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
932: $timeStr =~ s/12:00 am/midnight/;
933: $timeStr =~ s/12:00 pm/noon/;
934: return $timeStr;
1.58 albertel 935: }
1.53 bowersj2 936: }
937:
1.51 bowersj2 938: 1;
939:
940: package Apache::lonnavmaps::navmap;
941:
942: =pod
943:
944: lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, and also provides the Apache handler for the "Navigation Map" button.
945:
946: =head1 navmap object: Encapsulating the compiled nav map
947:
948: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
949:
950: 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.
951:
952: You must obtain resource objects through the navmap object.
953:
954: =head2 Methods
955:
956: =over 4
957:
1.70 bowersj2 958: =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.
1.51 bowersj2 959:
960: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
961:
962: =cut
963:
964: use strict;
965: use GDBM_File;
966:
967: sub new {
968: # magic invocation to create a class instance
969: my $proto = shift;
970: my $class = ref($proto) || $proto;
971: my $self = {};
972:
973: $self->{NAV_HASH_FILE} = shift;
974: $self->{PARM_HASH_FILE} = shift;
975: $self->{GENERATE_COURSE_USER_OPT} = shift;
1.55 bowersj2 976: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1.51 bowersj2 977:
1.101 bowersj2 978: # Resource cache stores navmap resources as we reference them. We generate
1.51 bowersj2 979: # them on-demand so we don't pay for creating resources unless we use them.
980: $self->{RESOURCE_CACHE} = {};
981:
982: # Network failure flag, if we accessed the course or user opt and
983: # failed
984: $self->{NETWORK_FAILURE} = 0;
985:
986: # tie the nav hash
987: my %navmaphash;
988: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
989: &GDBM_READER(), 0640))) {
990: return undef;
991: }
992:
993: my %parmhash;
994: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
995: &GDBM_READER(), 0640)))
996: {
1.66 bowersj2 997: untie $self->{PARM_HASH};
1.51 bowersj2 998: return undef;
999: }
1.115 bowersj2 1000:
1.129 bowersj2 1001: $self->{HASH_TIED} = 1;
1.123 bowersj2 1002: $self->{NAV_HASH} = \%navmaphash;
1003: $self->{PARM_HASH} = \%parmhash;
1.51 bowersj2 1004:
1.92 bowersj2 1005: bless($self);
1006:
1007: return $self;
1008: }
1009:
1010: sub init {
1.93 bowersj2 1011: my $self = shift;
1.92 bowersj2 1012:
1.51 bowersj2 1013: # If the course opt hash and the user opt hash should be generated,
1014: # generate them
1015: if ($self->{GENERATE_COURSE_USER_OPT}) {
1016: my $uname=$ENV{'user.name'};
1017: my $udom=$ENV{'user.domain'};
1018: my $uhome=$ENV{'user.home'};
1019: my $cid=$ENV{'request.course.id'};
1020: my $chome=$ENV{'course.'.$cid.'.home'};
1021: my ($cdom,$cnum)=split(/\_/,$cid);
1022:
1023: my $userprefix=$uname.'_'.$udom.'_';
1024:
1.99 bowersj2 1025: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1.51 bowersj2 1026: unless ($uhome eq 'no_host') {
1027: # ------------------------------------------------- Get coursedata (if present)
1028: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1029: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1030: ':resourcedata',$chome);
1031: if ($reply!~/^error\:/) {
1032: $courserdatas{$cid}=$reply;
1033: $courserdatas{$cid.'.last_cache'}=time;
1034: }
1035: # check to see if network failed
1036: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1037: {
1038: $self->{NETWORK_FAILURE} = 1;
1039: }
1040: }
1041: foreach (split(/\&/,$courserdatas{$cid})) {
1042: my ($name,$value)=split(/\=/,$_);
1043: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1044: &Apache::lonnet::unescape($value);
1045: }
1046: # --------------------------------------------------- Get userdata (if present)
1047: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1048: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1049: if ($reply!~/^error\:/) {
1050: $userrdatas{$uname.'___'.$udom}=$reply;
1051: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1052: }
1053: # check to see if network failed
1054: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1055: {
1056: $self->{NETWORK_FAILURE} = 1;
1057: }
1058: }
1059: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1060: my ($name,$value)=split(/\=/,$_);
1061: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1062: &Apache::lonnet::unescape($value);
1063: }
1.55 bowersj2 1064: $self->{COURSE_OPT} = \%courseopt;
1065: $self->{USER_OPT} = \%useropt;
1.51 bowersj2 1066: }
1067: }
1068:
1.55 bowersj2 1069: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1070: my $cid=$ENV{'request.course.id'};
1071: my ($cdom,$cnum)=split(/\_/,$cid);
1072:
1073: my %emailstatus = &Apache::lonnet::dump('email_status');
1.56 bowersj2 1074: my $logoutTime = $emailstatus{'logout'};
1075: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1.124 bowersj2 1076: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1.55 bowersj2 1077: $courseLeaveTime : $logoutTime);
1.56 bowersj2 1078: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1.55 bowersj2 1079: $cdom, $cnum);
1080: my %feedback=();
1081: my %error=();
1082: my $keys = &Apache::lonnet::reply('keys:'.
1083: $ENV{'user.domain'}.':'.
1084: $ENV{'user.name'}.':nohist_email',
1085: $ENV{'user.home'});
1086:
1087: foreach my $msgid (split(/\&/, $keys)) {
1088: $msgid=&Apache::lonnet::unescape($msgid);
1089: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1090: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1091: my ($what,$url)=($1,$2);
1092: my %status=
1093: &Apache::lonnet::get('email_status',[$msgid]);
1094: if ($status{$msgid}=~/^error\:/) {
1095: $status{$msgid}='';
1096: }
1097:
1098: if (($status{$msgid} eq 'new') ||
1099: (!$status{$msgid})) {
1100: if ($what eq 'Error') {
1101: $error{$url}.=','.$msgid;
1102: } else {
1103: $feedback{$url}.=','.$msgid;
1104: }
1105: }
1106: }
1107: }
1108:
1109: $self->{FEEDBACK} = \%feedback;
1110: $self->{ERROR_MSG} = \%error; # what is this? JB
1111: $self->{DISCUSSION_TIME} = \%discussiontime;
1112: $self->{EMAIL_STATUS} = \%emailstatus;
1113:
1114: }
1.84 bowersj2 1115:
1116: $self->{PARM_CACHE} = {};
1.55 bowersj2 1117: }
1.51 bowersj2 1118:
1.115 bowersj2 1119: # Internal function: Takes a key to look up in the nav hash and implements internal
1120: # memory caching of that key.
1121: sub navhash {
1122: my $self = shift; my $key = shift;
1123: return $self->{NAV_HASH}->{$key};
1124: }
1125:
1.55 bowersj2 1126: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1127: sub courseMapDefined {
1128: my $self = shift;
1129: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1130:
1.115 bowersj2 1131: my $firstres = $self->navhash("map_start_$uri");
1132: my $lastres = $self->navhash("map_finish_$uri");
1.55 bowersj2 1133: return $firstres && $lastres;
1.51 bowersj2 1134: }
1135:
1136: sub getIterator {
1137: my $self = shift;
1.98 bowersj2 1138: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1.101 bowersj2 1139: shift, undef, shift);
1.51 bowersj2 1140: return $iterator;
1141: }
1142:
1143: # unties the hash when done
1144: sub untieHashes {
1145: my $self = shift;
1.60 bowersj2 1146: untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
1147: untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
1.51 bowersj2 1148: $self->{HASH_TIED} = 0;
1149: }
1150:
1151: # when the object is destroyed, be sure to untie all the hashes we tied.
1152: sub DESTROY {
1153: my $self = shift;
1154: $self->untieHashes();
1155: }
1156:
1.125 bowersj2 1157: # Private method: Does the given resource (as a symb string) have
1.59 bowersj2 1158: # current discussion? Returns 0 if chat/mail data not extracted.
1159: sub hasDiscussion {
1160: my $self = shift;
1161: my $symb = shift;
1162: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1163:
1.124 bowersj2 1164: #return defined($self->{DISCUSSION_TIME}->{$symb});
1.59 bowersj2 1165: return $self->{DISCUSSION_TIME}->{$symb} >
1.66 bowersj2 1166: $self->{LAST_CHECK};
1.59 bowersj2 1167: }
1168:
1.125 bowersj2 1169: # Private method: Does the given resource (as a symb string) have
1.59 bowersj2 1170: # current feedback? Returns the string in the feedback hash, which
1171: # will be false if it does not exist.
1172: sub getFeedback {
1173: my $self = shift;
1174: my $symb = shift;
1175:
1176: if (!defined($self->{FEEDBACK})) { return ""; }
1177:
1178: return $self->{FEEDBACK}->{$symb};
1179: }
1180:
1.125 bowersj2 1181: # Private method: Get the errors for that resource (by source).
1.124 bowersj2 1182: sub getErrors {
1183: my $self = shift;
1184: my $src = shift;
1185:
1186: if (!defined($self->{ERROR_MSG})) { return ""; }
1187: return $self->{ERROR_MSG}->{$src};
1188: }
1189:
1.51 bowersj2 1190: =pod
1191:
1192: =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.
1193:
1194: =cut
1195:
1196: # The strategy here is to cache the resource objects, and only construct them
1197: # as we use them. The real point is to prevent reading any more from the tied
1198: # hash then we have to, which should hopefully alleviate speed problems.
1199: # Caching is just an incidental detail I throw in because it makes sense.
1200:
1201: sub getById {
1202: my $self = shift;
1203: my $id = shift;
1204:
1205: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1206: {
1207: return $self->{RESOURCE_CACHE}->{$id};
1208: }
1209:
1210: # resource handles inserting itself into cache.
1211: return Apache::lonnavmaps::resource->new($self, $id);
1212: }
1213:
1214: =pod
1215:
1216: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
1217:
1218: =cut
1219:
1220: sub firstResource {
1221: my $self = shift;
1.115 bowersj2 1222: my $firstResource = $self->navhash('map_start_' .
1223: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1.51 bowersj2 1224: return $self->getById($firstResource);
1225: }
1226:
1227: =pod
1228:
1229: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
1230:
1231: =cut
1232:
1233: sub finishResource {
1234: my $self = shift;
1.115 bowersj2 1235: my $firstResource = $self->navhash('map_finish_' .
1236: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1.51 bowersj2 1237: return $self->getById($firstResource);
1238: }
1239:
1.101 bowersj2 1240: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1241: # the actual lookup; parmval caches the results.
1.51 bowersj2 1242: sub parmval {
1243: my $self = shift;
1244: my ($what,$symb)=@_;
1.84 bowersj2 1245: my $hashkey = $what."|||".$symb;
1246:
1247: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1248: return $self->{PARM_CACHE}->{$hashkey};
1249: }
1250:
1251: my $result = $self->parmval_real($what, $symb);
1252: $self->{PARM_CACHE}->{$hashkey} = $result;
1253: return $result;
1254: }
1255:
1256: sub parmval_real {
1257: my $self = shift;
1258: my ($what,$symb) = @_;
1259:
1.51 bowersj2 1260: my $cid=$ENV{'request.course.id'};
1261: my $csec=$ENV{'request.course.sec'};
1262: my $uname=$ENV{'user.name'};
1263: my $udom=$ENV{'user.domain'};
1264:
1265: unless ($symb) { return ''; }
1266: my $result='';
1267:
1268: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1269:
1270: # ----------------------------------------------------- Cascading lookup scheme
1271: my $rwhat=$what;
1272: $what=~s/^parameter\_//;
1273: $what=~s/\_/\./;
1274:
1275: my $symbparm=$symb.'.'.$what;
1276: my $mapparm=$mapname.'___(all).'.$what;
1277: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1278:
1279: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1280: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1281: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1282:
1283: my $courselevel= $usercourseprefix.'.'.$what;
1284: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1285: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1286:
1287: my $useropt = $self->{USER_OPT};
1288: my $courseopt = $self->{COURSE_OPT};
1289: my $parmhash = $self->{PARM_HASH};
1290:
1291: # ---------------------------------------------------------- first, check user
1292: if ($uname and defined($useropt)) {
1.57 albertel 1293: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1294: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1295: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1.51 bowersj2 1296: }
1297:
1298: # ------------------------------------------------------- second, check course
1299: if ($csec and defined($courseopt)) {
1.57 albertel 1300: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1301: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1302: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1.51 bowersj2 1303: }
1304:
1305: if (defined($courseopt)) {
1.57 albertel 1306: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1307: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1308: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1.51 bowersj2 1309: }
1310:
1311: # ----------------------------------------------------- third, check map parms
1312:
1313: my $thisparm=$$parmhash{$symbparm};
1.57 albertel 1314: if (defined($thisparm)) { return $thisparm; }
1.51 bowersj2 1315:
1316: # ----------------------------------------------------- fourth , check default
1317:
1318: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1.57 albertel 1319: if (defined($default)) { return $default}
1.51 bowersj2 1320:
1321: # --------------------------------------------------- fifth , cascade up parts
1322:
1323: my ($space,@qualifier)=split(/\./,$rwhat);
1324: my $qualifier=join('.',@qualifier);
1325: unless ($space eq '0') {
1326: my ($part,$id)=split(/\_/,$space);
1327: if ($id) {
1328: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1.57 albertel 1329: if (defined($partgeneral)) { return $partgeneral; }
1.51 bowersj2 1330: } else {
1331: my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
1.57 albertel 1332: if (defined($resourcegeneral)) { return $resourcegeneral; }
1.51 bowersj2 1333: }
1334: }
1335: return '';
1336: }
1337:
1338:
1339: 1;
1340:
1341: package Apache::lonnavmaps::iterator;
1342:
1343: =pod
1344:
1345: =back
1346:
1347: =head1 navmap Iterator
1348:
1349: 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.
1350:
1351: 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:
1352:
1353: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1354:
1355: To get the next thing from the iterator, call B<next>:
1356:
1357: C<my $nextThing = $resourceIterator-E<gt>next()>
1358:
1359: getIterator behaves as follows:
1360:
1361: =over 4
1362:
1.116 bowersj2 1363: =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 1364:
1.101 bowersj2 1365: 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 1366:
1367: 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:
1368:
1369: =over 4
1370:
1.70 bowersj2 1371: =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
1372:
1373: =item * END_MAP: The map is now done.
1374:
1375: =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
1376:
1377: =item * END_BRANCH: The branch is now done.
1.51 bowersj2 1378:
1379: =back
1380:
1.70 bowersj2 1381: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
1382:
1.116 bowersj2 1383: 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.
1384:
1.70 bowersj2 1385: =back
1.51 bowersj2 1386:
1387: =cut
1388:
1389: # Here are the tokens for the iterator:
1390:
1391: sub BEGIN_MAP { return 1; } # begining of a new map
1392: sub END_MAP { return 2; } # end of the map
1393: sub BEGIN_BRANCH { return 3; } # beginning of a branch
1394: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 1395: sub FORWARD { return 1; } # go forward
1396: sub BACKWARD { return 2; }
1.51 bowersj2 1397:
1.96 bowersj2 1398: sub min {
1399: (my $a, my $b) = @_;
1400: if ($a < $b) { return $a; } else { return $b; }
1401: }
1402:
1.107 bowersj2 1403: # In the CVS repository, documentation of this algorithm is included
1404: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
1405: # will reference the same location in the text as the part of the
1406: # algorithm is running through.
1407:
1.94 bowersj2 1408: sub new {
1409: # magic invocation to create a class instance
1410: my $proto = shift;
1411: my $class = ref($proto) || $proto;
1412: my $self = {};
1413:
1414: $self->{NAV_MAP} = shift;
1415: return undef unless ($self->{NAV_MAP});
1416:
1417: # Handle the parameters
1418: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1419: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1420:
1421: # If the given resources are just the ID of the resource, get the
1422: # objects
1423: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1424: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1425: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1426: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1427:
1428: $self->{FILTER} = shift;
1429:
1430: # A hash, used as a set, of resource already seen
1431: $self->{ALREADY_SEEN} = shift;
1432: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1433: $self->{CONDITION} = shift;
1434:
1.116 bowersj2 1435: # Do we want to automatically follow "redirection" maps?
1436: $self->{FORCE_TOP} = shift;
1437:
1.94 bowersj2 1438: # Now, we need to pre-process the map, by walking forward and backward
1439: # over the parts of the map we're going to look at.
1.96 bowersj2 1440:
1.97 bowersj2 1441: # The processing steps are exactly the same, except for a few small
1442: # changes, so I bundle those up in the following list of two elements:
1443: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
1444: # first_resource).
1445: # This prevents writing nearly-identical code twice.
1446: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
1447: 'FIRST_RESOURCE'],
1448: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
1449: 'FINISH_RESOURCE'] );
1450:
1.98 bowersj2 1451: my $maxDepth = 0; # tracks max depth
1452:
1.116 bowersj2 1453: # If there is only one resource in this map, and it's a map, we
1454: # want to remember that, so the user can ask for the first map
1455: # that isn't just a redirector.
1456: my $resource; my $resourceCount = 0;
1457:
1.107 bowersj2 1458: # **1**
1459:
1.97 bowersj2 1460: foreach my $pass (@iterations) {
1461: my $direction = $pass->[0];
1462: my $valName = $pass->[1];
1463: my $nextResourceMethod = $pass->[2];
1464: my $firstResourceName = $pass->[3];
1465:
1466: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
1467: $self->{FIRST_RESOURCE},
1468: $self->{FINISH_RESOURCE},
1469: {}, undef, 0, $direction);
1.96 bowersj2 1470:
1.97 bowersj2 1471: # prime the recursion
1472: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 bowersj2 1473: my $depth = 0;
1.97 bowersj2 1474: $iterator->next();
1475: my $curRes = $iterator->next();
1.98 bowersj2 1476: while ($depth > -1) {
1.97 bowersj2 1477: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
1478: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 1479:
1.97 bowersj2 1480: if (ref($curRes)) {
1.116 bowersj2 1481: # If there's only one resource, this will save it
1.117 bowersj2 1482: # we have to filter empty resources from consideration here,
1483: # or even "empty", redirecting maps have two (start & finish)
1484: # or three (start, finish, plus redirector)
1485: if($direction == FORWARD && $curRes->src()) {
1486: $resource = $curRes; $resourceCount++;
1487: }
1.97 bowersj2 1488: my $resultingVal = $curRes->{DATA}->{$valName};
1489: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 1490: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 1491:
1.116 bowersj2 1492: if ($nextCount == 1) { # **3**
1.97 bowersj2 1493: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
1494: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
1495: }
1496:
1.116 bowersj2 1497: if ($nextCount > 1) { # **4**
1.97 bowersj2 1498: foreach my $res (@{$nextResources}) {
1499: my $current = $res->{DATA}->{$valName} || 999999999;
1500: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
1501: }
1502: }
1503: }
1.96 bowersj2 1504:
1.107 bowersj2 1505: # Assign the final val (**2**)
1.97 bowersj2 1506: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 1507: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
1508: $curRes->{DATA}->{BOT_UP_VAL});
1509:
1510: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
1511: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1512: }
1.97 bowersj2 1513: $curRes = $iterator->next();
1.96 bowersj2 1514: }
1515: }
1.94 bowersj2 1516:
1.116 bowersj2 1517: # Check: Was this only one resource, a map?
1518: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
1519: my $firstResource = $resource->map_start();
1520: my $finishResource = $resource->map_finish();
1521: return
1522: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1523: $finishResource, $self->{FILTER},
1524: $self->{ALREADY_SEEN},
1525: $self->{CONDITION}, 0);
1526:
1527: }
1528:
1.98 bowersj2 1529: # Set up some bookkeeping information.
1530: $self->{CURRENT_DEPTH} = 0;
1531: $self->{MAX_DEPTH} = $maxDepth;
1532: $self->{STACK} = [];
1533: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1534:
1535: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
1536: push @{$self->{STACK}}, [];
1537: }
1538:
1.107 bowersj2 1539: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 1540: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
1541: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
1542:
1543: bless ($self);
1544:
1545: return $self;
1546: }
1547:
1548: sub next {
1549: my $self = shift;
1550:
1551: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1552: # grab the next from the recursive iterator
1553: my $next = $self->{RECURSIVE_ITERATOR}->next();
1554:
1555: # is it a begin or end map? If so, update the depth
1556: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
1557: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
1558:
1559: # Are we back at depth 0? If so, stop recursing
1560: if ($self->{RECURSIVE_DEPTH} == 0) {
1561: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1562: }
1563:
1564: return $next;
1565: }
1566:
1567: if (defined($self->{FORCE_NEXT})) {
1568: my $tmp = $self->{FORCE_NEXT};
1569: $self->{FORCE_NEXT} = undef;
1570: return $tmp;
1571: }
1572:
1573: # Have we not yet begun? If not, return BEGIN_MAP and
1574: # remember we've started.
1575: if ( !$self->{STARTED} ) {
1576: $self->{STARTED} = 1;
1577: return $self->BEGIN_MAP();
1578: }
1579:
1580: # Here's the guts of the iterator.
1581:
1582: # Find the next resource, if any.
1583: my $found = 0;
1584: my $i = $self->{MAX_DEPTH};
1585: my $newDepth;
1586: my $here;
1587: while ( $i >= 0 && !$found ) {
1.107 bowersj2 1588: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
1589: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 1590: $found = 1;
1591: $newDepth = $i;
1592: }
1593: $i--;
1594: }
1595:
1596: # If we still didn't find anything, we're done.
1597: if ( !$found ) {
1598: # We need to get back down to the correct branch depth
1599: if ( $self->{CURRENT_DEPTH} > 0 ) {
1600: $self->{CURRENT_DEPTH}--;
1601: return END_BRANCH();
1602: } else {
1603: return END_MAP();
1604: }
1605: }
1606:
1.104 bowersj2 1607: # If this is not a resource, it must be an END_BRANCH marker we want
1608: # to return directly.
1.107 bowersj2 1609: if (!ref($here)) { # **8**
1.104 bowersj2 1610: if ($here == END_BRANCH()) { # paranoia, in case of later extension
1611: $self->{CURRENT_DEPTH}--;
1612: return $here;
1613: }
1614: }
1615:
1616: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
1617: $self->{HERE} = $here;
1618:
1.98 bowersj2 1619: # Get to the right level
1620: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
1621: push @{$self->{STACK}->[$newDepth]}, $here;
1622: $self->{CURRENT_DEPTH}--;
1623: return END_BRANCH();
1624: }
1625: if ( $self->{CURRENT_DEPTH} < $newDepth) {
1626: push @{$self->{STACK}->[$newDepth]}, $here;
1627: $self->{CURRENT_DEPTH}++;
1628: return BEGIN_BRANCH();
1629: }
1630:
1631: # If we made it here, we have the next resource, and we're at the
1632: # right branch level. So let's examine the resource for where
1633: # we can get to from here.
1634:
1635: # So we need to look at all the resources we can get to from here,
1636: # categorize them if we haven't seen them, remember if we have a new
1637: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 1638: my $maxDepthAdded = -1;
1639:
1.98 bowersj2 1640: for (@$nextUnfiltered) {
1641: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 1642: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
1643: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 1644: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 1645: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 1646: }
1647: }
1.104 bowersj2 1648:
1649: # Is this the end of a branch? If so, all of the resources examined above
1650: # led to lower levels then the one we are currently at, so we push a END_BRANCH
1651: # marker onto the stack so we don't forget.
1652: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
1653: # BC branch and gets to C, it will see F as the only next resource, but it's
1654: # one level lower. Thus, this is the end of the branch, since there are no
1655: # more resources added to this level or above.
1.111 bowersj2 1656: # We don't do this if the examined resource is the finish resource,
1657: # because the condition given above is true, but the "END_MAP" will
1658: # take care of things and we should already be at depth 0.
1.104 bowersj2 1659: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 1660: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 1661: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
1662: }
1663:
1.98 bowersj2 1664: # That ends the main iterator logic. Now, do we want to recurse
1665: # down this map (if this resource is a map)?
1666: if ($self->{HERE}->is_map() &&
1667: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1668: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
1669: my $firstResource = $self->{HERE}->map_start();
1670: my $finishResource = $self->{HERE}->map_finish();
1671:
1672: $self->{RECURSIVE_ITERATOR} =
1673: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1674: $finishResource, $self->{FILTER},
1675: $self->{ALREADY_SEEN}, $self->{CONDITION});
1676: }
1677:
1.116 bowersj2 1678: # If this is a blank resource, don't actually return it.
1.117 bowersj2 1679: # Should you ever find you need it, make sure to add an option to the code
1680: # that you can use; other things depend on this behavior.
1.129.2.1 albertel 1681: if (!$self->{HERE}->src() || !$self->{HERE}->browsePriv()) {
1.116 bowersj2 1682: return $self->next();
1683: }
1684:
1.98 bowersj2 1685: return $self->{HERE};
1686:
1687: }
1688:
1689: =pod
1690:
1691: 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).
1692:
1693: =cut
1694:
1695: sub getStack {
1696: my $self=shift;
1697:
1698: my @stack;
1699:
1700: $self->populateStack(\@stack);
1701:
1702: return \@stack;
1703: }
1704:
1705: # Private method: Calls the iterators recursively to populate the stack.
1706: sub populateStack {
1707: my $self=shift;
1708: my $stack = shift;
1709:
1710: push @$stack, $self->{HERE} if ($self->{HERE});
1711:
1712: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1713: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
1714: }
1.94 bowersj2 1715: }
1716:
1717: 1;
1718:
1719: package Apache::lonnavmaps::DFSiterator;
1720:
1.100 bowersj2 1721: # Not documented in the perldoc: This is a simple iterator that just walks
1722: # through the nav map and presents the resources in a depth-first search
1723: # fashion, ignorant of conditionals, randomized resources, etc. It presents
1724: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
1725: # useful for pre-processing of some kind, and is in fact used by the main
1726: # iterator that way, but that's about it.
1727: # One could imagine merging this into the init routine of the main iterator,
1728: # but this might as well be left seperate, since it is possible some other
1729: # use might be found for it. - Jeremy
1.94 bowersj2 1730:
1.117 bowersj2 1731: # Unlike the main iterator, this DOES return all resources, even blank ones.
1732: # The main iterator needs them to correctly preprocess the map.
1733:
1.94 bowersj2 1734: sub BEGIN_MAP { return 1; } # begining of a new map
1735: sub END_MAP { return 2; } # end of the map
1736: sub FORWARD { return 1; } # go forward
1737: sub BACKWARD { return 2; }
1738:
1.100 bowersj2 1739: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
1740: # filter hash ref (or undef), already seen hash or undef, condition
1741: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 1742: sub new {
1743: # magic invocation to create a class instance
1744: my $proto = shift;
1745: my $class = ref($proto) || $proto;
1746: my $self = {};
1747:
1748: $self->{NAV_MAP} = shift;
1749: return undef unless ($self->{NAV_MAP});
1750:
1751: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1752: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1753:
1754: # If the given resources are just the ID of the resource, get the
1755: # objects
1756: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1757: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1758: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1759: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1760:
1761: $self->{FILTER} = shift;
1762:
1763: # A hash, used as a set, of resource already seen
1764: $self->{ALREADY_SEEN} = shift;
1765: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 1766: $self->{CONDITION} = shift;
1.89 bowersj2 1767: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 1768:
1.100 bowersj2 1769: # Flag: Have we started yet?
1.51 bowersj2 1770: $self->{STARTED} = 0;
1771:
1772: # Should we continue calling the recursive iterator, if any?
1773: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1774: # The recursive iterator, if any
1775: $self->{RECURSIVE_ITERATOR} = undef;
1776: # Are we recursing on a map, or a branch?
1777: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
1778: # And the count of how deep it is, so that this iterator can keep track of
1779: # when to pick back up again.
1780: $self->{RECURSIVE_DEPTH} = 0;
1781:
1782: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 1783: $self->{STACK} = [];
1.51 bowersj2 1784:
1785: # Start with the first resource
1.89 bowersj2 1786: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 1787: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 1788: } else {
1.100 bowersj2 1789: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 1790: }
1.51 bowersj2 1791:
1792: bless($self);
1793: return $self;
1794: }
1795:
1796: sub next {
1797: my $self = shift;
1798:
1799: # Are we using a recursive iterator? If so, pull from that and
1800: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 1801: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 1802: # grab the next from the recursive iterator
1803: my $next = $self->{RECURSIVE_ITERATOR}->next();
1804:
1805: # is it a begin or end map? Update depth if so
1806: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
1807: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
1808:
1809: # Are we back at depth 0? If so, stop recursing.
1810: if ($self->{RECURSIVE_DEPTH} == 0) {
1811: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1812: }
1813:
1814: return $next;
1815: }
1816:
1817: # Is there a current resource to grab? If not, then return
1.100 bowersj2 1818: # END_MAP, which will end the iterator.
1819: if (scalar(@{$self->{STACK}}) == 0) {
1820: return $self->END_MAP();
1.51 bowersj2 1821: }
1822:
1823: # Have we not yet begun? If not, return BEGIN_MAP and
1824: # remember that we've started.
1825: if ( !$self->{STARTED} ) {
1826: $self->{STARTED} = 1;
1827: return $self->BEGIN_MAP;
1828: }
1829:
1830: # Get the next resource in the branch
1.100 bowersj2 1831: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 1832:
1.100 bowersj2 1833: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 1834: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
1835:
1836: # Get the next possible resources
1.90 bowersj2 1837: my $nextUnfiltered;
1.89 bowersj2 1838: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 1839: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 1840: } else {
1.90 bowersj2 1841: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 1842: }
1.51 bowersj2 1843: my $next = [];
1844:
1845: # filter the next possibilities to remove things we've
1.100 bowersj2 1846: # already seen.
1.51 bowersj2 1847: foreach (@$nextUnfiltered) {
1.52 bowersj2 1848: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1849: push @$next, $_;
1850: }
1.51 bowersj2 1851: }
1852:
1853: while (@$next) {
1.100 bowersj2 1854: # copy the next possibilities over to the stack
1855: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 1856: }
1857:
1858: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 1859: if ($self->{HERE}->is_map() &&
1.63 bowersj2 1860: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 1861: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
1862: my $firstResource = $self->{HERE}->map_start();
1863: my $finishResource = $self->{HERE}->map_finish();
1864:
1865: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 1866: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 1867: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 1868: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 1869: }
1870:
1871: return $self->{HERE};
1872: }
1873:
1.1 www 1874: 1;
1.2 www 1875:
1.51 bowersj2 1876: package Apache::lonnavmaps::resource;
1877:
1878: use Apache::lonnet;
1879:
1880: =pod
1881:
1882: =head1 Object: resource
1883:
1884: A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
1885:
1886: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
1887:
1888: You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.
1889:
1890: =head2 Public Members
1891:
1892: resource objects have a hash called DATA ($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.
1893:
1894: =head2 Methods
1895:
1896: =over 4
1897:
1.70 bowersj2 1898: =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.
1899:
1900: =back
1.51 bowersj2 1901:
1902: =cut
1903:
1904: sub new {
1905: # magic invocation to create a class instance
1906: my $proto = shift;
1907: my $class = ref($proto) || $proto;
1908: my $self = {};
1909:
1910: $self->{NAV_MAP} = shift;
1911: $self->{ID} = shift;
1912:
1913: # Store this new resource in the parent nav map's cache.
1914: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 1915: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 1916:
1917: # A hash that can be used by two-pass algorithms to store data
1918: # about this resource in. Not used by the resource object
1919: # directly.
1920: $self->{DATA} = {};
1921:
1922: bless($self);
1923:
1924: return $self;
1925: }
1926:
1.70 bowersj2 1927: # private function: simplify the NAV_HASH lookups we keep doing
1928: # pass the name, and to automatically append my ID, pass a true val on the
1929: # second param
1930: sub navHash {
1931: my $self = shift;
1932: my $param = shift;
1933: my $id = shift;
1.115 bowersj2 1934: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 1935: }
1936:
1.51 bowersj2 1937: =pod
1938:
1.70 bowersj2 1939: B<Metadata Retreival>
1940:
1.101 bowersj2 1941: 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 1942:
1943: =over 4
1944:
1.106 bowersj2 1945: =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").
1946:
1.70 bowersj2 1947: =item * B<ext>: Returns true if the resource is external.
1948:
1949: =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
1950:
1951: =item * B<kind>: Returns the kind of the resource from the compiled nav map.
1952:
1.101 bowersj2 1953: =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 1954:
1.70 bowersj2 1955: =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
1956:
1957: =item * B<src>: Returns the source for the resource.
1958:
1959: =item * B<symb>: Returns the symb for the resource.
1960:
1961: =item * B<title>: Returns the title of the resource.
1962:
1963: =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 1964:
1965: =back
1966:
1967: =cut
1968:
1969: # These info functions can be used directly, as they don't return
1970: # resource information.
1.85 bowersj2 1971: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 1972: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 1973: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 1974: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
1975: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 1976: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
1977: sub randompick {
1978: my $self = shift;
1979: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
1980: '.0.parameter_randompick'};
1981: }
1.51 bowersj2 1982: sub src {
1983: my $self=shift;
1984: return $self->navHash("src_", 1);
1985: }
1986: sub symb {
1987: my $self=shift;
1988: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
1989: my $symbSrc = &Apache::lonnet::declutter($self->src());
1990: return &Apache::lonnet::declutter(
1991: $self->navHash('map_id_'.$first))
1992: . '___' . $second . '___' . $symbSrc;
1993: }
1.70 bowersj2 1994: sub title { my $self=shift; return $self->navHash("title_", 1); }
1995: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 1996: sub compTitle {
1997: my $self = shift;
1998: my $title = $self->title();
1999: if (!$title) {
2000: $title = $self->src();
2001: $title = substr($title, rindex($title, '/') + 1);
2002: }
2003: return $title;
2004: }
1.70 bowersj2 2005: =pod
2006:
2007: B<Predicate Testing the Resource>
2008:
2009: These methods are shortcuts to deciding if a given resource has a given property.
2010:
2011: =over 4
2012:
2013: =item * B<is_map>: Returns true if the resource is a map type.
2014:
2015: =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.)
2016:
2017: =item * B<is_page>: Returns true if the resource is a page.
2018:
2019: =item * B<is_problem>: Returns true if the resource is a problem.
2020:
1.101 bowersj2 2021: =item * B<is_sequence>: Returns true if the resource is a sequence.
1.70 bowersj2 2022:
2023: =back
2024:
2025: =cut
2026:
2027:
2028: sub is_html {
1.51 bowersj2 2029: my $self=shift;
2030: my $src = $self->src();
1.70 bowersj2 2031: return ($src =~ /html$/);
1.51 bowersj2 2032: }
1.70 bowersj2 2033: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2034: sub is_page {
1.51 bowersj2 2035: my $self=shift;
2036: my $src = $self->src();
1.70 bowersj2 2037: return ($src =~ /page$/);
1.51 bowersj2 2038: }
1.70 bowersj2 2039: sub is_problem {
1.51 bowersj2 2040: my $self=shift;
2041: my $src = $self->src();
1.70 bowersj2 2042: return ($src =~ /problem$/);
1.51 bowersj2 2043: }
1.70 bowersj2 2044: sub is_sequence {
1.51 bowersj2 2045: my $self=shift;
2046: my $src = $self->src();
1.70 bowersj2 2047: return ($src =~ /sequence$/);
1.51 bowersj2 2048: }
2049:
1.101 bowersj2 2050: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 2051: sub parmval {
2052: my $self = shift;
2053: my $what = shift;
2054: my $part = shift || "0";
2055: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2056: }
2057:
1.70 bowersj2 2058: =pod
2059:
2060: B<Map Methods>
2061:
2062: These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
2063:
2064: =over 4
2065:
2066: =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
2067:
2068: =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.
2069:
2070: =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
2071:
2072: =item * B<map_type>: Returns a string with the type of the map in it.
2073:
2074: =back
1.51 bowersj2 2075:
1.70 bowersj2 2076: =cut
1.51 bowersj2 2077:
2078: sub map_finish {
2079: my $self = shift;
2080: my $src = $self->src();
2081: my $res = $self->navHash("map_finish_$src", 0);
2082: $res = $self->{NAV_MAP}->getById($res);
2083: return $res;
2084: }
1.70 bowersj2 2085: sub map_pc {
2086: my $self = shift;
2087: my $src = $self->src();
2088: return $self->navHash("map_pc_$src", 0);
2089: }
1.51 bowersj2 2090: sub map_start {
2091: my $self = shift;
2092: my $src = $self->src();
2093: my $res = $self->navHash("map_start_$src", 0);
2094: $res = $self->{NAV_MAP}->getById($res);
2095: return $res;
2096: }
2097: sub map_type {
2098: my $self = shift;
2099: my $pc = $self->map_pc();
2100: return $self->navHash("map_type_$pc", 0);
2101: }
2102:
2103:
2104:
2105: #####
2106: # Property queries
2107: #####
2108:
2109: # These functions will be responsible for returning the CORRECT
2110: # VALUE for the parameter, no matter what. So while they may look
2111: # like direct calls to parmval, they can be more then that.
2112: # So, for instance, the duedate function should use the "duedatetype"
2113: # information, rather then the resource object user.
2114:
2115: =pod
2116:
2117: =head2 Resource Parameters
2118:
1.70 bowersj2 2119: 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 2120:
2121: 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.)
2122:
2123: =over 4
2124:
2125: =item * B<acc>: Get the Client IP/Name Access Control information.
2126:
2127: =item * B<answerdate>: Get the answer-reveal date for the problem.
2128:
2129: =item * B<duedate>: Get the due date for the problem.
2130:
2131: =item * B<tries>: Get the number of tries the student has used on the problem.
2132:
2133: =item * B<maxtries>: Get the number of max tries allowed.
2134:
2135: =item * B<opendate>: Get the open date for the problem.
2136:
2137: =item * B<sig>: Get the significant figures setting.
2138:
2139: =item * B<tol>: Get the tolerance for the problem.
2140:
1.70 bowersj2 2141: =item * B<tries>: Get the number of tries the user has already used on the problem.
2142:
1.51 bowersj2 2143: =item * B<type>: Get the question type for the problem.
2144:
2145: =item * B<weight>: Get the weight for the problem.
2146:
2147: =back
2148:
2149: =cut
2150:
2151: sub acc {
2152: (my $self, my $part) = @_;
2153: return $self->parmval("acc", $part);
2154: }
2155: sub answerdate {
2156: (my $self, my $part) = @_;
2157: # Handle intervals
2158: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2159: return $self->duedate($part) +
2160: $self->parmval("answerdate", $part);
2161: }
2162: return $self->parmval("answerdate", $part);
1.106 bowersj2 2163: }
1.108 bowersj2 2164: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
1.51 bowersj2 2165: sub duedate {
2166: (my $self, my $part) = @_;
2167: return $self->parmval("duedate", $part);
2168: }
2169: sub maxtries {
2170: (my $self, my $part) = @_;
2171: return $self->parmval("maxtries", $part);
2172: }
2173: sub opendate {
2174: (my $self, my $part) = @_;
2175: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2176: return $self->duedate($part) -
2177: $self->parmval("opendate", $part);
2178: }
2179: return $self->parmval("opendate");
2180: }
2181: sub sig {
2182: (my $self, my $part) = @_;
2183: return $self->parmval("sig", $part);
2184: }
2185: sub tol {
2186: (my $self, my $part) = @_;
2187: return $self->parmval("tol", $part);
2188: }
1.108 bowersj2 2189: sub tries {
2190: my $self = shift;
2191: my $tries = $self->queryRestoreHash('tries', shift);
2192: if (!defined($tries)) { return '0';}
1.51 bowersj2 2193: return $tries;
2194: }
1.70 bowersj2 2195: sub type {
2196: (my $self, my $part) = @_;
2197: return $self->parmval("type", $part);
2198: }
1.109 bowersj2 2199: sub weight {
2200: my $self = shift; my $part = shift;
1.70 bowersj2 2201: return $self->parmval("weight", $part);
2202: }
1.51 bowersj2 2203:
2204: # Multiple things need this
2205: sub getReturnHash {
2206: my $self = shift;
2207:
2208: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 2209: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 2210: $self->{RETURN_HASH} = \%tmpHash;
2211: }
2212: }
2213:
2214: ######
2215: # Status queries
2216: ######
2217:
2218: # These methods query the status of problems.
2219:
2220: # If we need to count parts, this function determines the number of
2221: # parts from the metadata. When called, it returns a reference to a list
2222: # of strings corresponding to the parts. (Thus, using it in a scalar context
2223: # tells you how many parts you have in the problem:
2224: # $partcount = scalar($resource->countParts());
2225: # Don't use $self->{PARTS} directly because you don't know if it's been
2226: # computed yet.
2227:
2228: =pod
2229:
2230: =head2 Resource misc
2231:
2232: Misc. functions for the resource.
2233:
2234: =over 4
2235:
1.59 bowersj2 2236: =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.
2237:
2238: =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:
2239:
2240: for (split(/\,/, $res->getFeedback())) {
2241: my $link = &Apache::lonnet::escape($_);
2242: ...
2243:
2244: and use the link as appropriate.
2245:
2246: =cut
2247:
2248: sub hasDiscussion {
2249: my $self = shift;
2250: return $self->{NAV_MAP}->hasDiscussion($self->symb());
2251: }
2252:
2253: sub getFeedback {
2254: my $self = shift;
1.124 bowersj2 2255: my $source = $self->src();
1.125 bowersj2 2256: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 2257: return $self->{NAV_MAP}->getFeedback($source);
2258: }
2259:
2260: sub getErrors {
2261: my $self = shift;
2262: my $source = $self->src();
2263: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
2264: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 2265: }
2266:
2267: =pod
2268:
1.70 bowersj2 2269: =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 2270:
1.70 bowersj2 2271: =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 2272:
2273: =back
2274:
2275: =cut
2276:
2277: sub parts {
2278: my $self = shift;
2279:
1.67 bowersj2 2280: if ($self->ext) { return ['0']; }
2281:
1.51 bowersj2 2282: $self->extractParts();
2283: return $self->{PARTS};
2284: }
2285:
2286: sub countParts {
2287: my $self = shift;
2288:
2289: my $parts = $self->parts();
1.129.2.2 albertel 2290: my $delta = 0;
2291: for my $part (@$parts) {
2292: if ($part eq '0') { $delta--; }
2293: }
1.66 bowersj2 2294:
2295: if ($self->{RESOURCE_ERROR}) {
2296: return 0;
2297: }
2298:
1.129.2.2 albertel 2299: return scalar(@{$parts}) + $delta;
1.51 bowersj2 2300: }
2301:
2302: # Private function: Extracts the parts information and saves it
2303: sub extractParts {
2304: my $self = shift;
2305:
2306: return if ($self->{PARTS});
1.67 bowersj2 2307: return if ($self->ext);
1.51 bowersj2 2308:
2309: $self->{PARTS} = [];
2310:
1.82 bowersj2 2311: # Retrieve part count, if this is a problem
2312: if ($self->is_problem()) {
1.129.2.2 albertel 2313: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.82 bowersj2 2314: if (!$metadata) {
2315: $self->{RESOURCE_ERROR} = 1;
2316: $self->{PARTS} = [];
2317: return;
2318: }
2319:
2320: foreach (split(/\,/,$metadata)) {
1.129.2.2 albertel 2321: if ($_ =~ /^part_(.*)$/) {
1.82 bowersj2 2322: push @{$self->{PARTS}}, $1;
2323: }
1.51 bowersj2 2324: }
1.82 bowersj2 2325:
2326:
2327: # Is this possible to do in one line? - Jeremy
2328: my @sortedParts = sort @{$self->{PARTS}};
2329: $self->{PARTS} = \@sortedParts;
1.51 bowersj2 2330: }
2331:
2332: return;
2333: }
2334:
2335: =pod
2336:
2337: =head2 Resource Status
2338:
1.101 bowersj2 2339: Problem resources have status information, reflecting their various dates and completion statuses.
1.51 bowersj2 2340:
2341: There are two aspects to the status: the date-related information and the completion information.
2342:
2343: Idiomatic usage of these two methods would probably look something like
2344:
2345: foreach ($resource->parts()) {
2346: my $dateStatus = $resource->getDateStatus($_);
2347: my $completionStatus = $resource->getCompletionStatus($_);
2348:
1.70 bowersj2 2349: or
2350:
2351: my $status = $resource->status($_);
2352:
1.51 bowersj2 2353: ... use it here ...
2354: }
2355:
1.101 bowersj2 2356: 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.
2357:
2358: The symbolic constants shown below can be accessed through the resource object: $res->OPEN.
2359:
1.51 bowersj2 2360: =over 4
2361:
1.70 bowersj2 2362: =item * B<getDateStatus>($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 2363:
2364: =back
2365:
2366: B<Date Codes>
2367:
2368: =over 4
2369:
2370: =item * B<OPEN_LATER>: The problem will be opened later.
2371:
2372: =item * B<OPEN>: Open and not yet due.
2373:
1.59 bowersj2 2374:
1.54 bowersj2 2375: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
2376:
2377: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51 bowersj2 2378:
2379: =item * B<ANSWER_OPEN>: The answer date is here.
2380:
2381: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
2382:
2383: =back
2384:
2385: =cut
2386:
2387: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 2388: sub OPEN_LATER { return 0; }
2389: sub OPEN { return 1; }
2390: sub PAST_DUE_NO_ANSWER { return 2; }
2391: sub PAST_DUE_ANSWER_LATER { return 3; }
2392: sub ANSWER_OPEN { return 4; }
2393: sub NOTHING_SET { return 5; }
2394: sub NETWORK_FAILURE { return 100; }
2395:
2396: # getDateStatus gets the date status for a given problem part.
2397: # Because answer date, due date, and open date are fully independent
2398: # (i.e., it is perfectly possible to *only* have an answer date),
2399: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
2400: # (past, future, none given). This function handles this with a decision
2401: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 2402:
2403: sub getDateStatus {
2404: my $self = shift;
2405: my $part = shift;
2406: $part = "0" if (!defined($part));
1.54 bowersj2 2407:
2408: # Always return network failure if there was one.
1.51 bowersj2 2409: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2410:
2411: my $now = time();
2412:
1.53 bowersj2 2413: my $open = $self->opendate($part);
2414: my $due = $self->duedate($part);
2415: my $answer = $self->answerdate($part);
2416:
2417: if (!$open && !$due && !$answer) {
2418: # no data on the problem at all
2419: # should this be the same as "open later"? think multipart.
2420: return $self->NOTHING_SET;
2421: }
1.59 bowersj2 2422: if (!$open || $now < $open) {return $self->OPEN_LATER}
2423: if (!$due || $now < $due) {return $self->OPEN}
2424: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
2425: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 2426: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 2427: }
2428:
2429: =pod
2430:
2431: B<>
2432:
2433: =over 4
2434:
2435: =item * B<getCompletionStatus>($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:
2436:
2437: =back
2438:
2439: B<Completion Codes>
2440:
2441: =over 4
2442:
2443: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
2444:
2445: =item * B<INCORRECT>: Attempted, but wrong by student.
2446:
2447: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
2448:
2449: =item * B<CORRECT>: Correct or correct by instructor.
2450:
2451: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
2452:
2453: =item * B<EXCUSED>: Excused. Not yet implemented.
2454:
2455: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
2456:
1.69 bowersj2 2457: =item * B<ATTEMPTED>: Attempted, and not yet graded.
2458:
1.51 bowersj2 2459: =back
2460:
2461: =cut
2462:
1.53 bowersj2 2463: sub NOT_ATTEMPTED { return 10; }
2464: sub INCORRECT { return 11; }
2465: sub INCORRECT_BY_OVERRIDE { return 12; }
2466: sub CORRECT { return 13; }
2467: sub CORRECT_BY_OVERRIDE { return 14; }
2468: sub EXCUSED { return 15; }
1.69 bowersj2 2469: sub ATTEMPTED { return 16; }
1.51 bowersj2 2470:
2471: sub getCompletionStatus {
2472: my $self = shift;
2473: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2474:
1.108 bowersj2 2475: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 2476:
2477: # Left as seperate if statements in case we ever do more with this
2478: if ($status eq 'correct_by_student') {return $self->CORRECT;}
2479: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
2480: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
2481: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
2482: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 2483: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 2484: return $self->NOT_ATTEMPTED;
1.108 bowersj2 2485: }
2486:
2487: sub queryRestoreHash {
2488: my $self = shift;
2489: my $hashentry = shift;
2490: my $part = shift;
2491: $part = "0" if (!defined($part));
2492: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2493:
2494: $self->getReturnHash();
2495:
2496: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 2497: }
2498:
2499: =pod
2500:
2501: B<Composite Status>
2502:
1.101 bowersj2 2503: Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):
1.51 bowersj2 2504:
2505: =over 4
2506:
1.70 bowersj2 2507: =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
1.51 bowersj2 2508:
1.70 bowersj2 2509: =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 2510:
1.70 bowersj2 2511: =item * B<CORRECT>: For any reason at all, the part is considered correct.
1.51 bowersj2 2512:
1.70 bowersj2 2513: =item * B<EXCUSED>: For any reason at all, the problem is excused.
1.51 bowersj2 2514:
1.70 bowersj2 2515: =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
1.54 bowersj2 2516:
1.70 bowersj2 2517: =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 2518:
1.70 bowersj2 2519: =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
1.51 bowersj2 2520:
1.70 bowersj2 2521: =item * B<OPEN_LATER>: The problem is not yet open.
1.51 bowersj2 2522:
1.70 bowersj2 2523: =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
1.51 bowersj2 2524:
1.70 bowersj2 2525: =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
1.51 bowersj2 2526:
1.70 bowersj2 2527: =item * B<OPEN>: The item is open and not yet tried.
1.51 bowersj2 2528:
1.70 bowersj2 2529: =item * B<ATTEMPTED>: The problem has been attempted.
1.69 bowersj2 2530:
1.51 bowersj2 2531: =back
2532:
2533: =cut
2534:
2535: sub TRIES_LEFT { return 10; }
2536:
2537: sub status {
2538: my $self = shift;
2539: my $part = shift;
2540: if (!defined($part)) { $part = "0"; }
2541: my $completionStatus = $self->getCompletionStatus($part);
2542: my $dateStatus = $self->getDateStatus($part);
2543:
2544: # What we have is a two-dimensional matrix with 4 entries on one
2545: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 2546: # plus network failure and "no date data at all".
1.51 bowersj2 2547:
1.53 bowersj2 2548: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 2549:
2550: # There are a few whole rows we can dispose of:
1.53 bowersj2 2551: if ($completionStatus == CORRECT ||
2552: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.69 bowersj2 2553: return CORRECT;
2554: }
2555:
2556: if ($completionStatus == ATTEMPTED) {
2557: return ATTEMPTED;
1.53 bowersj2 2558: }
2559:
2560: # If it's EXCUSED, then return that no matter what
2561: if ($completionStatus == EXCUSED) {
2562: return EXCUSED;
1.51 bowersj2 2563: }
2564:
1.53 bowersj2 2565: if ($dateStatus == NOTHING_SET) {
2566: return NOTHING_SET;
1.51 bowersj2 2567: }
2568:
1.69 bowersj2 2569: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
2570: # by 4 matrix (date statuses).
1.51 bowersj2 2571:
1.54 bowersj2 2572: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 2573: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 2574: return $dateStatus;
1.51 bowersj2 2575: }
2576:
1.53 bowersj2 2577: if ($dateStatus == ANSWER_OPEN) {
2578: return ANSWER_OPEN;
1.51 bowersj2 2579: }
2580:
2581: # Now: (incorrect, incorrect_override, not_attempted) x
2582: # (open_later), (open)
2583:
1.53 bowersj2 2584: if ($dateStatus == OPEN_LATER) {
2585: return OPEN_LATER;
1.51 bowersj2 2586: }
2587:
2588: # If it's WRONG...
1.53 bowersj2 2589: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 2590: # and there are TRIES LEFT:
1.79 bowersj2 2591: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 2592: return TRIES_LEFT;
1.51 bowersj2 2593: }
1.53 bowersj2 2594: return INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 2595: }
2596:
2597: # Otherwise, it's untried and open
1.53 bowersj2 2598: return OPEN;
1.51 bowersj2 2599: }
2600:
2601: =pod
2602:
2603: =head2 Resource/Nav Map Navigation
2604:
2605: =over 4
2606:
1.101 bowersj2 2607: =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 2608:
1.101 bowersj2 2609: =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 2610:
2611: =cut
2612:
2613: sub getNext {
2614: my $self = shift;
2615: my @branches;
2616: my $to = $self->to();
1.85 bowersj2 2617: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 2618: my $choice = $self->{NAV_MAP}->getById($branch);
2619: my $next = $choice->goesto();
2620: $next = $self->{NAV_MAP}->getById($next);
2621:
1.129.2.1 albertel 2622: push @branches, $next;
1.85 bowersj2 2623: }
2624: return \@branches;
2625: }
2626:
2627: sub getPrevious {
2628: my $self = shift;
2629: my @branches;
2630: my $from = $self->from();
2631: foreach my $branch ( split /,/, $from) {
2632: my $choice = $self->{NAV_MAP}->getById($branch);
2633: my $prev = $choice->comesfrom();
2634: $prev = $self->{NAV_MAP}->getById($prev);
2635:
1.129.2.1 albertel 2636: push @branches, $prev;
1.51 bowersj2 2637: }
2638: return \@branches;
1.129.2.1 albertel 2639: }
2640:
2641: sub browsePriv {
2642: my $self = shift;
2643: if (defined($self->{BROWSE_PRIV})) {
2644: return $self->{BROWSE_PRIV};
2645: }
2646:
2647: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 2648: }
2649:
2650: =pod
1.2 www 2651:
1.51 bowersj2 2652: =back
1.2 www 2653:
1.51 bowersj2 2654: =cut
1.2 www 2655:
1.51 bowersj2 2656: 1;
1.2 www 2657:
1.51 bowersj2 2658: __END__
1.2 www 2659:
2660:
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