Annotation of loncom/interface/lonnavmaps.pm, revision 1.131
1.72 bowersj2 1:
1.2 www 2: # The LearningOnline Network with CAPA
3: # Navigate Maps Handler
1.1 www 4: #
1.131 ! bowersj2 5: # $Id: lonnavmaps.pm,v 1.130 2003/01/14 18:47:50 www Exp $
1.20 albertel 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.2 www 29: # (Page Handler
1.1 www 30: #
1.2 www 31: # (TeX Content Handler
1.1 www 32: #
1.2 www 33: # 05/29/00,05/30 Gerd Kortemeyer)
34: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
35: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
1.1 www 36: #
1.17 www 37: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
1.21 www 38: # YEAR=2002
39: # 1/1 Gerd Kortemeyer
1.105 bowersj2 40: # Oct-Nov Jeremy Bowers
1.2 www 41:
1.1 www 42: package Apache::lonnavmaps;
43:
44: use strict;
1.2 www 45: use Apache::Constants qw(:common :http);
1.18 albertel 46: use Apache::loncommon();
1.73 bowersj2 47: use POSIX qw (floor strftime);
1.2 www 48:
1.130 www 49: my %navmaphash;
50: my %parmhash;
51:
52: sub cleanup {
53: if (tied(%navmaphash)){
54: &Apache::lonnet::logthis('Cleanup navmaps: navmaphash');
55: unless (untie(%navmaphash)) {
56: &Apache::lonnet::logthis('Failed cleanup navmaps: navmaphash');
57: }
58: }
59: if (tied(%parmhash)){
60: &Apache::lonnet::logthis('Cleanup navmaps: parmhash');
61: unless (untie(%parmhash)) {
62: &Apache::lonnet::logthis('Failed cleanup navmaps: parmhash');
63: }
64: }
65: }
66:
1.1 www 67: sub handler {
1.99 bowersj2 68: my $r = shift;
1.118 bowersj2 69: real_handler($r);
70: }
71:
72: sub real_handler {
73: my $r = shift;
1.2 www 74:
1.51 bowersj2 75: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
76:
77: # Handle header-only request
78: if ($r->header_only) {
79: if ($ENV{'browser.mathml'}) {
80: $r->content_type('text/xml');
81: } else {
82: $r->content_type('text/html');
83: }
84: $r->send_http_header;
85: return OK;
86: }
87:
88: # Send header, don't cache this page
89: if ($ENV{'browser.mathml'}) {
90: $r->content_type('text/xml');
91: } else {
92: $r->content_type('text/html');
93: }
94: &Apache::loncommon::no_cache($r);
95: $r->send_http_header;
96:
1.106 bowersj2 97: # Create the nav map
1.51 bowersj2 98: my $navmap = Apache::lonnavmaps::navmap->new(
99: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 100: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 101:
1.55 bowersj2 102:
103: if (!defined($navmap)) {
104: my $requrl = $r->uri;
105: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
106: return HTTP_NOT_ACCEPTABLE;
107: }
1.64 bowersj2 108:
1.111 bowersj2 109: $r->print("<html><head>\n");
1.118 bowersj2 110: $r->print("<title>Navigate Course Contents</title></head>");
1.111 bowersj2 111:
1.64 bowersj2 112: # Header
1.111 bowersj2 113: $r->print(&Apache::loncommon::bodytag('Navigate Course Contents','',
1.64 bowersj2 114: ''));
115: $r->print('<script>window.focus();</script>');
1.101 bowersj2 116:
1.124 bowersj2 117: $r->rflush();
118:
119: # Now that we've displayed some stuff to the user, init the navmap
120: $navmap->init();
121:
1.95 bowersj2 122: $r->print('<table border="0" cellpadding="2" cellspacing="0">');
1.64 bowersj2 123: my $date=localtime;
1.95 bowersj2 124: $r->print('<tr><td align="right" valign="bottom">Key: </td>');
1.101 bowersj2 125:
126: # Print discussions and feedback header
1.65 bowersj2 127: if ($navmap->{LAST_CHECK}) {
1.95 bowersj2 128: $r->print('<td align="center" valign="bottom"> '.
129: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1.73 bowersj2 130: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1.95 bowersj2 131: '</td><td align="center" valign="bottom"> '.
132: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
133: '</td>');
134: } else {
135: $r->print('<td align="center" valign="bottom"> '.
136: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
137: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
138: '</td>');
139: }
140: $r->print('</tr></table>');
1.101 bowersj2 141:
1.95 bowersj2 142: my $condition = 0;
143: if ($ENV{'form.condition'}) {
144: $condition = 1;
145: }
146:
1.118 bowersj2 147: # Determine where the "here" marker is and where the screen jumps to.
148: my $SYMB = 1; my $URL = 2; my $NOTHING = 3; # symbolic constants
149: my $hereType; # the type of marker, $SYMB, $URL, or $NOTHING
150: my $here; # the actual URL or SYMB for the here marker
151: my $jumpType; # The type of the thing we have a jump for, $SYMB or $URL
152: my $jump; # the SYMB/URL of the resource we need to jump to
153:
154: if ( $ENV{'form.alreadyHere'} ) { # we came from a user's manipulation of the nav page
155: # If this is a click on a folder or something, we want to preserve the "here"
156: # from the querystring, and get the new "jump" marker
157: $hereType = $ENV{'form.hereType'};
158: $here = $ENV{'form.here'};
159: $jumpType = $ENV{'form.jumpType'} || $NOTHING;
160: $jump = $ENV{'form.jump'};
161: } else { # the user is visiting the nav map from the remote
162: # We're coming from the remote. We have either a url, a symb, or nothing,
163: # and we need to figure out what.
164: # Preference: Symb
165:
166: if ($ENV{'form.symb'}) {
167: $hereType = $jumpType = $SYMB;
168: $here = $jump = $ENV{'form.symb'};
169: } elsif ($ENV{'form.postdata'}) {
170: # couldn't find a symb, is there a URL?
171: my $currenturl = $ENV{'form.postdata'};
172: $currenturl=~s/^http\:\/\///;
173: $currenturl=~s/^[^\/]+//;
174:
175: $hereType = $jumpType = $URL;
176: $here = $jump = $currenturl;
177: } else {
178: # Nothing
179: $hereType = $jumpType = $NOTHING;
180: }
181: }
1.110 bowersj2 182:
1.118 bowersj2 183:
1.110 bowersj2 184: # alreadyHere allows us to only open the maps necessary to view
185: # the current location once, while at the same time remembering
186: # the current location. Without that check, the user would never
187: # be able to close those maps; the user would close it, and the
188: # currenturl scan would re-open it.
1.118 bowersj2 189: my $queryAdd = "&alreadyHere=1";
1.110 bowersj2 190:
1.95 bowersj2 191: if ($condition) {
1.118 bowersj2 192: $r->print("<a href=\"navmaps?condition=0&filter=&$queryAdd" .
193: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
194: "\">Close All Folders</a>");
1.65 bowersj2 195: } else {
1.118 bowersj2 196: $r->print("<a href=\"navmaps?condition=1&filter=&$queryAdd" .
197: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
198: "\">Open All Folders</a>");
1.65 bowersj2 199: }
1.55 bowersj2 200:
1.95 bowersj2 201: $r->print('<br> ');
202: $r->rflush();
203:
1.55 bowersj2 204: # Check that it's defined
205: if (!($navmap->courseMapDefined())) {
206: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
207: '</body></html>');
208: return OK;
209: }
210:
1.51 bowersj2 211: # Grab a resource object so we have access to the constants; this
212: # is technically not proper, but should be harmless
213: my $res = $navmap->firstResource();
214:
1.101 bowersj2 215: # These are some data tables, which make it easy to change some of
216: # of the specific visualization parameters if desired.
217:
1.51 bowersj2 218: # Defines a status->color mapping, null string means don't color
219: my %colormap =
1.54 bowersj2 220: ( $res->NETWORK_FAILURE => '',
1.59 bowersj2 221: $res->CORRECT => '',
1.112 bowersj2 222: $res->EXCUSED => '#3333FF',
1.59 bowersj2 223: $res->PAST_DUE_ANSWER_LATER => '',
224: $res->PAST_DUE_NO_ANSWER => '',
1.112 bowersj2 225: $res->ANSWER_OPEN => '#006600',
1.54 bowersj2 226: $res->OPEN_LATER => '',
1.59 bowersj2 227: $res->TRIES_LEFT => '',
228: $res->INCORRECT => '',
229: $res->OPEN => '',
1.54 bowersj2 230: $res->NOTHING_SET => '' );
1.59 bowersj2 231: # And a special case in the nav map; what to do when the assignment
232: # is not yet done and due in less then 24 hours
1.86 bowersj2 233: my $hurryUpColor = "#FF0000";
1.59 bowersj2 234:
1.115 bowersj2 235: # Keep these mappings in sync with lonquickgrades, which uses the colors
236: # instead of the icons.
1.59 bowersj2 237: my %statusIconMap =
1.66 bowersj2 238: ( $res->NETWORK_FAILURE => '',
239: $res->NOTHING_SET => '',
240: $res->CORRECT => 'navmap.correct.gif',
241: $res->EXCUSED => 'navmap.correct.gif',
242: $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
243: $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
244: $res->ANSWER_OPEN => 'navmap.wrong.gif',
245: $res->OPEN_LATER => '',
246: $res->TRIES_LEFT => 'navmap.open.gif',
247: $res->INCORRECT => 'navmap.wrong.gif',
1.69 bowersj2 248: $res->OPEN => 'navmap.open.gif',
1.85 bowersj2 249: $res->ATTEMPTED => 'navmap.open.gif' );
1.69 bowersj2 250:
251: my %iconAltTags =
252: ( 'navmap.correct.gif' => 'Correct',
253: 'navmap.wrong.gif' => 'Incorrect',
254: 'navmap.open.gif' => 'Open' );
1.59 bowersj2 255:
256: my %condenseStatuses =
1.66 bowersj2 257: ( $res->NETWORK_FAILURE => 1,
258: $res->NOTHING_SET => 1,
259: $res->CORRECT => 1 );
1.51 bowersj2 260:
261: my %filterHash;
262: # Figure out what we're not displaying
263: foreach (split(/\,/, $ENV{"form.filter"})) {
264: if ($_) {
265: $filterHash{$_} = "1";
266: }
267: }
268:
1.88 bowersj2 269: # Is this a new-style course? If so, we want to suppress showing the top-level
270: # maps in their own folders, in favor of "inlining" them.
271: my $topResource = $navmap->getById("0.0");
1.63 bowersj2 272:
1.51 bowersj2 273: # Begin the HTML table
1.59 bowersj2 274: # four cols: resource + indent, chat+feedback, icon, text string
1.85 bowersj2 275: $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
1.51 bowersj2 276:
1.74 bowersj2 277: # This needs to be updated to use symbs from the remote,
278: # instead of uris. The changes to this and the main rendering
279: # loop should be obvious.
280: # Here's a simple example of the iterator.
1.88 bowersj2 281: # Preprocess the map: Look for current URL, force inlined maps to display
282:
1.118 bowersj2 283: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.88 bowersj2 284: my $found = 0;
285: my $depth = 1;
1.118 bowersj2 286: my $currentJumpIndex = 0; # keeps track of when the current resource is found,
1.91 bowersj2 287: # so we can back up a few and put the anchor above the
288: # current resource
1.118 bowersj2 289: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1.101 bowersj2 290: # before the current resource when using #current
1.88 bowersj2 291: $mapIterator->next(); # discard the first BEGIN_MAP
292: my $curRes = $mapIterator->next();
1.91 bowersj2 293: my $counter = 0;
1.118 bowersj2 294: my $foundJump = ($jumpType == $NOTHING); # look for jump point if we have one
295: my $looped = 0;
1.116 bowersj2 296:
297: # We only need to do this if we need to open the maps to show the
1.118 bowersj2 298: # current position. This will change the counter so we can't count
299: # for the jump marker with this loop.
1.116 bowersj2 300: while ($depth > 0 && !$ENV{'form.alreadyHere'}) {
1.96 bowersj2 301: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
302: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.120 bowersj2 303:
1.118 bowersj2 304: if (ref($curRes) && !$ENV{'form.alreadyHere'} &&
305: ($hereType == $SYMB && $curRes->symb() eq $here) ||
1.119 bowersj2 306: (ref($curRes) && $hereType == $URL && $curRes->src() eq $here)) {
1.118 bowersj2 307: my $mapStack = $mapIterator->getStack();
308:
309: # Ensure the parent maps are open
310: for my $map (@{$mapStack}) {
311: if ($condition) {
312: undef $filterHash{$map->map_pc()};
313: } else {
314: $filterHash{$map->map_pc()} = 1;
315: }
316: }
317: $ENV{'form.alreadyHere'} = 1;
318: }
319: $looped = 1;
320:
321: $curRes = $mapIterator->next();
322: }
323:
324: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 0);
325: $depth = 1;
326: $mapIterator->next();
327: $curRes = $mapIterator->next();
1.88 bowersj2 328:
1.118 bowersj2 329: while ($depth > 0 && !$foundJump) {
330: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
331: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.91 bowersj2 332: if (ref($curRes)) { $counter++; }
333:
1.118 bowersj2 334: if (ref($curRes) &&
335: (($jumpType == $SYMB && $curRes->symb() eq $jump) ||
336: ($jumpType == $URL && $curRes->src() eq $jump))) {
1.88 bowersj2 337: # If this is the correct resource, be sure to
338: # show it by making sure the containing maps
339: # are open.
1.91 bowersj2 340:
1.101 bowersj2 341: # This is why we have to use the main iterator instead of the
342: # potentially faster DFS: The count has to be the same, so
343: # the order has to be the same, which DFS won't give us.
1.118 bowersj2 344: $currentJumpIndex = $counter;
345: $foundJump = 1;
1.88 bowersj2 346: }
1.118 bowersj2 347:
1.88 bowersj2 348: $curRes = $mapIterator->next();
1.74 bowersj2 349: }
1.88 bowersj2 350:
1.53 bowersj2 351: undef $res; # so we don't accidentally use it later
1.72 bowersj2 352: my $indentLevel = 0;
1.61 bowersj2 353: my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";
1.51 bowersj2 354:
355: my $isNewBranch = 0;
1.59 bowersj2 356: my $now = time();
357: my $in24Hours = $now + 24 * 60 * 60;
1.78 bowersj2 358: my $displayedHereMarker = 0;
1.118 bowersj2 359: my $displayedJumpMarker = 0;
1.88 bowersj2 360:
1.72 bowersj2 361: # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
362: # code in iterator->next), so ignore the first one
1.89 bowersj2 363: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
1.74 bowersj2 364: $condition);
1.72 bowersj2 365: $mapIterator->next();
1.89 bowersj2 366: $curRes = $mapIterator->next();
1.90 bowersj2 367: $depth = 1;
1.88 bowersj2 368:
369: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
370: my $rowNum = 0;
1.51 bowersj2 371:
1.91 bowersj2 372: $counter = 0;
373:
1.72 bowersj2 374: while ($depth > 0) {
1.51 bowersj2 375: if ($curRes == $mapIterator->BEGIN_MAP() ||
1.52 bowersj2 376: $curRes == $mapIterator->BEGIN_BRANCH()) {
1.51 bowersj2 377: $indentLevel++;
378: }
379: if ($curRes == $mapIterator->END_MAP() ||
1.52 bowersj2 380: $curRes == $mapIterator->END_BRANCH()) {
1.51 bowersj2 381: $indentLevel--;
382: }
1.52 bowersj2 383: if ($curRes == $mapIterator->BEGIN_BRANCH()) {
384: $isNewBranch = 1;
1.72 bowersj2 385: }
1.96 bowersj2 386: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
387: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.51 bowersj2 388:
1.91 bowersj2 389: if (ref($curRes)) { $counter++; }
390:
1.101 bowersj2 391: # Is this resource being ignored because it is in a random-out
392: # map and it was not selected?
1.68 bowersj2 393: if (ref($curRes) && !advancedUser() && $curRes->randomout()) {
394: $curRes = $mapIterator->next();
1.101 bowersj2 395: next; # if yes, then just ignore this resource
1.68 bowersj2 396: }
397:
1.116 bowersj2 398: if (ref($curRes)) {
1.51 bowersj2 399:
1.113 bowersj2 400: my $deltalevel = $isNewBranch? 1 : 0; # reserves space for branch icon
401:
1.116 bowersj2 402: if ($indentLevel - $deltalevel < 0) {
1.113 bowersj2 403: # If this would be at a negative depth (top-level maps in
404: # new-style courses, we want to suppress their title display)
405: # then ignore it.
406: $curRes = $mapIterator->next();
407: next;
408: }
409:
1.66 bowersj2 410: # Step one: Decide which parts to show
411: my @parts = @{$curRes->parts()};
412: my $multipart = scalar(@parts) > 1;
413: my $condensed = 0;
414:
1.51 bowersj2 415: if ($curRes->is_problem()) {
1.101 bowersj2 416:
1.66 bowersj2 417: # Is it multipart?
418: if ($multipart) {
419: # If it's multipart, see if part 0 is "open"
420: # if it is, display all parts, if it isn't,
421: # just display first
422: if (!$curRes->opendate("0")) {
1.101 bowersj2 423: # no parts are open, display as one part
424: @parts = ("0");
1.68 bowersj2 425: $condensed = 1;
1.66 bowersj2 426: } else {
427: # Otherwise, only display part 0 if we want to
428: # attach feedback or email information to it
429: if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
430: shift @parts;
431: } else {
432: # Now, we decide whether to condense the
433: # parts due to similarity
434: my $status = $curRes->status($parts[1]);
435: my $due = $curRes->duedate($parts[1]);
436: my $open = $curRes->opendate($parts[1]);
437: my $statusAllSame = 1;
438: my $dueAllSame = 1;
439: my $openAllSame = 1;
440: for (my $i = 2; $i < scalar(@parts); $i++) {
441: if ($curRes->status($parts[$i]) != $status){
442: $statusAllSame = 0;
443: }
444: if ($curRes->duedate($parts[$i]) != $due ) {
445: $dueAllSame = 0;
446: }
447: if ($curRes->opendate($parts[$i]) != $open) {
448: $openAllSame = 0;
449: }
450: }
451:
452: # $allSame is true if all the statuses were
453: # the same. Now, if they are all the same and
454: # match one of the statuses to condense, or they
455: # are all open with the same due date, or they are
456: # all OPEN_LATER with the same open date, display the
457: # status of the first non-zero part (to get the 'correct'
458: # status right, since 0 is never 'correct' or 'open').
459: if (($statusAllSame && defined($condenseStatuses{$status})) ||
460: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
461: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
462: @parts = ($parts[1]);
463: $condensed = 1;
464: }
465: }
466: }
467: }
1.59 bowersj2 468:
1.51 bowersj2 469: } else {
1.84 bowersj2 470: $parts[0] = "0"; # this is to get past foreach loop below
1.51 bowersj2 471: # you can consider a non-problem resource as a resource
1.101 bowersj2 472: # with only one part without loss, and it simplifies the looping
1.51 bowersj2 473: }
474:
1.83 bowersj2 475: # Is it a multipart problem with a single part, now in
1.101 bowersj2 476: # @parts with "0" filtered out? If so, 'forget' it's a multi-part
1.83 bowersj2 477: # problem and treat it like a single-part problem.
478: if ( scalar(@parts) == 1 ) {
479: $multipart = 0;
480: }
481:
1.66 bowersj2 482: # Display one part, in event of network error.
483: # If this is a single part, we can at least show the correct
1.101 bowersj2 484: # status, but if it's multipart, we're lost, since we can't
485: # retreive the metadata to count the parts
1.66 bowersj2 486: if ($curRes->{RESOURCE_ERROR}) {
487: @parts = ("0");
488: }
489:
1.101 bowersj2 490: # Step Two: Print the actual data.
491:
492: # For each part we intend to display...
1.51 bowersj2 493: foreach my $part (@parts) {
1.59 bowersj2 494:
1.68 bowersj2 495: my $nonLinkedText = ""; # unlinked stuff after title
1.51 bowersj2 496:
497: my $stack = $mapIterator->getStack();
498: my $src = getLinkForResource($stack);
499:
1.101 bowersj2 500: # Pass the correct symb on the querystring, so the
501: # remote will figure out where we are if we click a link
1.51 bowersj2 502: my $srcHasQuestion = $src =~ /\?/;
503: my $link = $src.
504: ($srcHasQuestion?'&':'?') .
505: 'symb='.&Apache::lonnet::escape($curRes->symb()).
506: '"';
1.101 bowersj2 507:
1.106 bowersj2 508: my $title = $curRes->compTitle();
1.122 www 509: if ($src=~/^\/uploaded\//) {
510: $nonLinkedText=$title;
511: $title='';
512: }
1.51 bowersj2 513: my $partLabel = "";
1.52 bowersj2 514: my $newBranchText = "";
515:
516: # If this is a new branch, label it so
517: if ($isNewBranch) {
1.59 bowersj2 518: $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
1.52 bowersj2 519: $isNewBranch = 0;
520: }
1.51 bowersj2 521:
522: # links to open and close the folders
523: my $linkopen = "<a href=\"$link\">";
524: my $linkclose = "</a>";
525:
1.61 bowersj2 526: my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";
1.51 bowersj2 527: if ($curRes->is_problem()) {
1.66 bowersj2 528: if ($part eq "0" || $condensed) {
529: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />';
530: } else {
531: $icon = $indentString;
532: }
1.51 bowersj2 533: }
534:
535: # Display the correct icon, link to open or shut map
536: if ($curRes->is_map()) {
537: my $mapId = $curRes->map_pc();
1.82 bowersj2 538: my $nowOpen = (!defined($filterHash{$mapId}));
539: if ($condition) {$nowOpen = !$nowOpen;}
1.51 bowersj2 540: $icon = $nowOpen ?
1.77 bowersj2 541: "navmap.folder.closed.gif" : "navmap.folder.open.gif";
1.66 bowersj2 542: $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";
1.52 bowersj2 543: $linkopen = "<a href=\"/adm/navmaps?filter=";
1.66 bowersj2 544: $linkopen .= ($nowOpen xor $condition) ?
1.51 bowersj2 545: addToFilter(\%filterHash, $mapId) :
546: removeFromFilter(\%filterHash, $mapId);
1.118 bowersj2 547: $linkopen .= "&condition=$condition&$queryAdd" .
548: "&hereType=$hereType&here=" .
549: Apache::lonnet::escape($here) . "&jumpType=$SYMB&" .
550: "jump=" . Apache::lonnet::escape($curRes->symb()) ."\">";
1.51 bowersj2 551: $linkclose = "</a>";
1.68 bowersj2 552:
1.51 bowersj2 553: }
554:
555: my $colorizer = "";
1.86 bowersj2 556: my $color;
1.51 bowersj2 557: if ($curRes->is_problem()) {
1.115 bowersj2 558: $color = $colormap{$curRes->status};
1.74 bowersj2 559:
1.115 bowersj2 560: if (dueInLessThen24Hours($curRes, $part) ||
561: lastTry($curRes, $part)) {
1.79 bowersj2 562: $color = $hurryUpColor;
563: }
1.115 bowersj2 564:
1.51 bowersj2 565: if ($color ne "") {
566: $colorizer = "bgcolor=\"$color\"";
567: }
568: }
569:
1.68 bowersj2 570: if ($curRes->randomout()) {
571: $nonLinkedText .= ' <i>(hidden)</i> ';
572: }
573:
1.88 bowersj2 574: $rowNum++;
575: my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
576:
1.91 bowersj2 577: # FIRST COL: The resource indentation, branch icon, name, and anchor
1.116 bowersj2 578: $r->print(" <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\">\n");
1.51 bowersj2 579:
1.101 bowersj2 580: # Print the anchor if necessary
1.118 bowersj2 581: if ($counter == $currentJumpIndex - $currentJumpDelta ) {
582: $r->print('<a name="curloc" />');
583: $displayedJumpMarker = 1;
1.91 bowersj2 584: }
585:
1.51 bowersj2 586: # print indentation
1.116 bowersj2 587: for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {
1.51 bowersj2 588: $r->print($indentString);
589: }
590:
1.61 bowersj2 591: $r->print(" ${newBranchText}${linkopen}$icon${linkclose}\n");
1.51 bowersj2 592:
1.74 bowersj2 593: my $curMarkerBegin = "";
594: my $curMarkerEnd = "";
595:
596: # Is this the current resource?
1.118 bowersj2 597: if (!$displayedHereMarker &&
598: (($hereType == $SYMB && $curRes->symb eq $here) ||
599: ($hereType == $URL && $curRes->src eq $here))) {
600: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1.74 bowersj2 601: $curMarkerEnd = '<font color="red" size="+2"> <</font>';
1.78 bowersj2 602: $displayedHereMarker = 1;
1.74 bowersj2 603: }
604:
1.69 bowersj2 605: if ($curRes->is_problem() && $part ne "0" && !$condensed) {
1.66 bowersj2 606: $partLabel = " (Part $part)";
607: $title = "";
608: }
1.83 bowersj2 609: if ($multipart && $condensed) {
1.68 bowersj2 610: $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';
1.66 bowersj2 611: }
1.59 bowersj2 612:
1.74 bowersj2 613: $r->print(" $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
1.66 bowersj2 614:
1.118 bowersj2 615: #if ($curRes->{RESOURCE_ERROR}) {
616: # $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
617: # '<font size="-1">Host down</font>'));
618: # }
1.66 bowersj2 619:
1.113 bowersj2 620: $r->print("</td>\n");
621:
1.101 bowersj2 622: # SECOND COL: Is there text, feedback, errors??
1.124 bowersj2 623: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1.66 bowersj2 624:
625: if ($curRes->hasDiscussion()) {
626: $discussionHTML = $linkopen .
627: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
628: $linkclose;
629: }
630:
631: if ($curRes->getFeedback()) {
632: my $feedback = $curRes->getFeedback();
633: foreach (split(/\,/, $feedback)) {
634: if ($_) {
635: $feedbackHTML .= ' <a href="/adm/email?display='
636: . &Apache::lonnet::escape($_) . '">'
637: . '<img src="/adm/lonMisc/feedback.gif" '
638: . 'border="0" /></a>';
639: }
640: }
641: }
642:
1.124 bowersj2 643: if ($curRes->getErrors()) {
644: my $errors = $curRes->getErrors();
645: foreach (split(/,/, $errors)) {
646: if ($_) {
647: $errorHTML .= ' <a href="/adm/email?display='
648: . &Apache::lonnet::escape($_) . '">'
649: . '<img src="/adm/lonMisc/bomb.gif" '
650: . 'border="0" /></a>';
651: }
652: }
653: }
654:
655: $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>");
1.66 bowersj2 656:
657: # Is this the first displayed part of a multi-part problem
658: # that has not been condensed, so we should suppress these two
1.101 bowersj2 659: # columns so we don't display useless status info about part
660: # "0"?
1.66 bowersj2 661: my $firstDisplayed = !$condensed && $multipart && $part eq "0";
662:
1.69 bowersj2 663: # THIRD COL: Problem status icon
1.66 bowersj2 664: if ($curRes->is_problem() &&
665: !$firstDisplayed) {
666: my $icon = $statusIconMap{$curRes->status($part)};
1.69 bowersj2 667: my $alt = $iconAltTags{$icon};
1.66 bowersj2 668: if ($icon) {
1.84 bowersj2 669: $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");
1.66 bowersj2 670: } else {
1.84 bowersj2 671: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 672: }
673: } else { # not problem, no icon
1.84 bowersj2 674: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 675: }
676:
1.69 bowersj2 677: # FOURTH COL: Text description
1.86 bowersj2 678: $r->print("<td align=\"right\" valign=\"center\">\n");
1.51 bowersj2 679:
1.61 bowersj2 680: if ($curRes->kind() eq "res" &&
681: $curRes->is_problem() &&
1.66 bowersj2 682: !$firstDisplayed) {
1.86 bowersj2 683: $r->print ("<font color=\"$color\"><b>") if ($color);
1.53 bowersj2 684: $r->print (getDescription($curRes, $part));
1.86 bowersj2 685: $r->print ("</b></font>") if ($color);
1.51 bowersj2 686: }
1.68 bowersj2 687: if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {
688: $r->print('(randomly select ' . $curRes->randompick() .')');
689: }
1.59 bowersj2 690:
1.84 bowersj2 691: $r->print(" </td></tr>\n");
1.113 bowersj2 692:
693: if (!($counter % 20)) { $r->rflush(); }
694: if ($counter == 2) { $r->rflush(); }
1.51 bowersj2 695: }
696: }
697: $curRes = $mapIterator->next();
698: }
699:
1.118 bowersj2 700: $r->print("</table>");
701:
702: # Print out the part that jumps to #curloc if it exists
703: if ($displayedJumpMarker) {
704: $r->print('<script>location += "#curloc";</script>');
705: }
706:
1.126 bowersj2 707: $navmap->untieHashes();
1.51 bowersj2 708:
1.128 bowersj2 709: $r->print("</body></html>");
1.59 bowersj2 710:
1.51 bowersj2 711: return OK;
712: }
713:
714: # Convenience functions: Returns a string that adds or subtracts
715: # the second argument from the first hash, appropriate for the
716: # query string that determines which folders to recurse on
717: sub addToFilter {
718: my $hashIn = shift;
719: my $addition = shift;
720: my %hash = %$hashIn;
721: $hash{$addition} = 1;
722:
723: return join (",", keys(%hash));
724: }
725:
726: sub removeFromFilter {
727: my $hashIn = shift;
728: my $subtraction = shift;
729: my %hash = %$hashIn;
730:
731: delete $hash{$subtraction};
732: return join(",", keys(%hash));
733: }
734:
735: # Convenience function: Given a stack returned from getStack on the iterator,
736: # return the correct src() value.
737: # Later, this should add an anchor when we start putting anchors in pages.
738: sub getLinkForResource {
739: my $stack = shift;
740: my $res;
741:
742: # Check to see if there are any pages in the stack
743: foreach $res (@$stack) {
744: if (defined($res) && $res->is_page()) {
745: return $res->src();
746: }
747: }
748:
749: # Failing that, return the src of the last resource that is defined
750: # (when we first recurse on a map, it puts an undefined resource
751: # on the bottom because $self->{HERE} isn't defined yet, and we
752: # want the src for the map anyhow)
753: foreach (@$stack) {
754: if (defined($_)) { $res = $_; }
755: }
756:
757: return $res->src();
758: }
759:
1.53 bowersj2 760: # Convenience function: This seperates the logic of how to create
761: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
762: # etc.) into a seperate function. It takes a resource object as the
763: # first parameter, and the part number of the resource as the second.
764: # It's basically a big switch statement on the status of the resource.
765:
766: sub getDescription {
767: my $res = shift;
768: my $part = shift;
1.69 bowersj2 769: my $status = $res->status($part);
1.53 bowersj2 770:
771: if ($status == $res->NETWORK_FAILURE) { return ""; }
772: if ($status == $res->NOTHING_SET) {
773: return "Not currently assigned.";
774: }
775: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 776: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 777: }
778: if ($status == $res->OPEN) {
1.79 bowersj2 779: if ($res->duedate($part)) {
1.73 bowersj2 780: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 781: } else {
782: return "Open, no due date";
783: }
1.53 bowersj2 784: }
1.54 bowersj2 785: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 786: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 787: }
788: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 789: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 790: }
791: if ($status == $res->ANSWER_OPEN) {
792: return "Answer available";
793: }
1.59 bowersj2 794: if ($status == $res->EXCUSED) {
1.66 bowersj2 795: return "Excused by instructor";
1.59 bowersj2 796: }
1.69 bowersj2 797: if ($status == $res->ATTEMPTED) {
798: return "Not yet graded.";
799: }
1.59 bowersj2 800: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 801: my $tries = $res->tries($part);
802: my $maxtries = $res->maxtries($part);
803: my $triesString = "";
804: if ($tries && $maxtries) {
805: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
806: if ($maxtries > 1 && $maxtries - $tries == 1) {
807: $triesString = "<b>$triesString</b>";
808: }
809: }
1.66 bowersj2 810: if ($res->duedate()) {
1.73 bowersj2 811: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 812: " $triesString";
813: } else {
814: return "No due date $triesString";
815: }
1.59 bowersj2 816: }
1.53 bowersj2 817: }
818:
1.115 bowersj2 819: # Convenience function, so others can use it: Is the problem due in less then
820: # 24 hours, and still can be done?
821:
822: sub dueInLessThen24Hours {
823: my $res = shift;
824: my $part = shift;
825: my $status = $res->status($part);
826:
827: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
828: $status == $res->TRIES_LEFT()) &&
829: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
830: $res->duedate() > time();
831: }
832:
833: # Convenience function, so others can use it: Is there only one try remaining for the
834: # part, with more then one try to begin with, not due yet and still can be done?
835: sub lastTry {
836: my $res = shift;
837: my $part = shift;
838:
839: my $tries = $res->tries($part);
840: my $maxtries = $res->maxtries($part);
841: return $tries && $maxtries && $maxtries > 1 &&
842: $maxtries - $tries == 1 && $res->duedate() &&
843: $res->duedate() > time();
844: }
845:
1.101 bowersj2 846: # This puts a human-readable name on the ENV variable.
1.68 bowersj2 847: sub advancedUser {
848: return $ENV{'user.adv'};
849: }
850:
1.73 bowersj2 851:
852: # timeToHumanString takes a time number and converts it to a
853: # human-readable representation, meant to be used in the following
854: # manner:
855: # print "Due $timestring"
856: # print "Open $timestring"
857: # print "Answer available $timestring"
858: # Very, very, very, VERY English-only... goodness help a localizer on
859: # this func...
1.53 bowersj2 860: sub timeToHumanString {
1.58 albertel 861: my ($time) = @_;
862: # zero, '0' and blank are bad times
1.73 bowersj2 863: if (!$time) {
864: return 'never';
865: }
866:
867: my $now = time();
868:
869: my @time = localtime($time);
870: my @now = localtime($now);
871:
872: # Positive = future
873: my $delta = $time - $now;
874:
875: my $minute = 60;
876: my $hour = 60 * $minute;
877: my $day = 24 * $hour;
878: my $week = 7 * $day;
879: my $inPast = 0;
880:
881: # Logic in comments:
882: # Is it now? (extremely unlikely)
883: if ( $delta == 0 ) {
884: return "this instant";
885: }
886:
887: if ($delta < 0) {
888: $inPast = 1;
889: $delta = -$delta;
890: }
891:
892: if ( $delta > 0 ) {
1.101 bowersj2 893:
1.73 bowersj2 894: my $tense = $inPast ? " ago" : "";
895: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 896:
897: # Less then a minute
1.73 bowersj2 898: if ( $delta < $minute ) {
899: if ($delta == 1) { return "${prefix}1 second$tense"; }
900: return "$prefix$delta seconds$tense";
901: }
902:
1.101 bowersj2 903: # Less then an hour
1.73 bowersj2 904: if ( $delta < $hour ) {
905: # If so, use minutes
906: my $minutes = floor($delta / 60);
907: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
908: return "$prefix$minutes minutes$tense";
909: }
910:
911: # Is it less then 24 hours away? If so,
912: # display hours + minutes
913: if ( $delta < $hour * 24) {
914: my $hours = floor($delta / $hour);
915: my $minutes = floor(($delta % $hour) / $minute);
916: my $hourString = "$hours hours";
917: my $minuteString = ", $minutes minutes";
918: if ($hours == 1) {
919: $hourString = "1 hour";
920: }
921: if ($minutes == 1) {
922: $minuteString = ", 1 minute";
923: }
924: if ($minutes == 0) {
925: $minuteString = "";
926: }
927: return "$prefix$hourString$minuteString$tense";
928: }
929:
930: # Less then 5 days away, display day of the week and
931: # HH:MM
932: if ( $delta < $day * 5 ) {
1.85 bowersj2 933: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 934: $timeStr =~ s/12:00 am/midnight/;
935: $timeStr =~ s/12:00 pm/noon/;
936: return ($inPast ? "last " : "next ") .
937: $timeStr;
938: }
939:
940: # Is it this year?
941: if ( $time[5] == $now[5]) {
942: # Return on Month Day, HH:MM meridian
943: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
944: $timeStr =~ s/12:00 am/midnight/;
945: $timeStr =~ s/12:00 pm/noon/;
946: return $timeStr;
947: }
948:
949: # Not this year, so show the year
950: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
951: $timeStr =~ s/12:00 am/midnight/;
952: $timeStr =~ s/12:00 pm/noon/;
953: return $timeStr;
1.58 albertel 954: }
1.53 bowersj2 955: }
956:
1.51 bowersj2 957: 1;
958:
959: package Apache::lonnavmaps::navmap;
960:
961: =pod
962:
963: 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.
964:
965: =head1 navmap object: Encapsulating the compiled nav map
966:
967: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
968:
969: 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.
970:
971: You must obtain resource objects through the navmap object.
972:
973: =head2 Methods
974:
975: =over 4
976:
1.70 bowersj2 977: =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 978:
979: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
980:
981: =cut
982:
983: use strict;
984: use GDBM_File;
985:
986: sub new {
987: # magic invocation to create a class instance
988: my $proto = shift;
989: my $class = ref($proto) || $proto;
990: my $self = {};
991:
992: $self->{NAV_HASH_FILE} = shift;
993: $self->{PARM_HASH_FILE} = shift;
994: $self->{GENERATE_COURSE_USER_OPT} = shift;
1.55 bowersj2 995: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1.51 bowersj2 996:
1.101 bowersj2 997: # Resource cache stores navmap resources as we reference them. We generate
1.51 bowersj2 998: # them on-demand so we don't pay for creating resources unless we use them.
999: $self->{RESOURCE_CACHE} = {};
1000:
1001: # Network failure flag, if we accessed the course or user opt and
1002: # failed
1003: $self->{NETWORK_FAILURE} = 0;
1004:
1005: # tie the nav hash
1.130 www 1006:
1.51 bowersj2 1007: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1008: &GDBM_READER(), 0640))) {
1009: return undef;
1010: }
1011:
1012: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1013: &GDBM_READER(), 0640)))
1014: {
1.66 bowersj2 1015: untie $self->{PARM_HASH};
1.51 bowersj2 1016: return undef;
1017: }
1.115 bowersj2 1018:
1.129 bowersj2 1019: $self->{HASH_TIED} = 1;
1.123 bowersj2 1020: $self->{NAV_HASH} = \%navmaphash;
1021: $self->{PARM_HASH} = \%parmhash;
1.51 bowersj2 1022:
1.92 bowersj2 1023: bless($self);
1024:
1025: return $self;
1026: }
1027:
1028: sub init {
1.93 bowersj2 1029: my $self = shift;
1.92 bowersj2 1030:
1.51 bowersj2 1031: # If the course opt hash and the user opt hash should be generated,
1032: # generate them
1033: if ($self->{GENERATE_COURSE_USER_OPT}) {
1034: my $uname=$ENV{'user.name'};
1035: my $udom=$ENV{'user.domain'};
1036: my $uhome=$ENV{'user.home'};
1037: my $cid=$ENV{'request.course.id'};
1038: my $chome=$ENV{'course.'.$cid.'.home'};
1039: my ($cdom,$cnum)=split(/\_/,$cid);
1040:
1041: my $userprefix=$uname.'_'.$udom.'_';
1042:
1.99 bowersj2 1043: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1.51 bowersj2 1044: unless ($uhome eq 'no_host') {
1045: # ------------------------------------------------- Get coursedata (if present)
1046: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1047: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1048: ':resourcedata',$chome);
1049: if ($reply!~/^error\:/) {
1050: $courserdatas{$cid}=$reply;
1051: $courserdatas{$cid.'.last_cache'}=time;
1052: }
1053: # check to see if network failed
1054: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1055: {
1056: $self->{NETWORK_FAILURE} = 1;
1057: }
1058: }
1059: foreach (split(/\&/,$courserdatas{$cid})) {
1060: my ($name,$value)=split(/\=/,$_);
1061: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1062: &Apache::lonnet::unescape($value);
1063: }
1064: # --------------------------------------------------- Get userdata (if present)
1065: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1066: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1067: if ($reply!~/^error\:/) {
1068: $userrdatas{$uname.'___'.$udom}=$reply;
1069: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1070: }
1071: # check to see if network failed
1072: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1073: {
1074: $self->{NETWORK_FAILURE} = 1;
1075: }
1076: }
1077: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1078: my ($name,$value)=split(/\=/,$_);
1079: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1080: &Apache::lonnet::unescape($value);
1081: }
1.55 bowersj2 1082: $self->{COURSE_OPT} = \%courseopt;
1083: $self->{USER_OPT} = \%useropt;
1.51 bowersj2 1084: }
1085: }
1086:
1.55 bowersj2 1087: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1088: my $cid=$ENV{'request.course.id'};
1089: my ($cdom,$cnum)=split(/\_/,$cid);
1090:
1091: my %emailstatus = &Apache::lonnet::dump('email_status');
1.56 bowersj2 1092: my $logoutTime = $emailstatus{'logout'};
1093: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1.124 bowersj2 1094: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1.55 bowersj2 1095: $courseLeaveTime : $logoutTime);
1.56 bowersj2 1096: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1.55 bowersj2 1097: $cdom, $cnum);
1098: my %feedback=();
1099: my %error=();
1100: my $keys = &Apache::lonnet::reply('keys:'.
1101: $ENV{'user.domain'}.':'.
1102: $ENV{'user.name'}.':nohist_email',
1103: $ENV{'user.home'});
1104:
1105: foreach my $msgid (split(/\&/, $keys)) {
1106: $msgid=&Apache::lonnet::unescape($msgid);
1107: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1108: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1109: my ($what,$url)=($1,$2);
1110: my %status=
1111: &Apache::lonnet::get('email_status',[$msgid]);
1112: if ($status{$msgid}=~/^error\:/) {
1113: $status{$msgid}='';
1114: }
1115:
1116: if (($status{$msgid} eq 'new') ||
1117: (!$status{$msgid})) {
1118: if ($what eq 'Error') {
1119: $error{$url}.=','.$msgid;
1120: } else {
1121: $feedback{$url}.=','.$msgid;
1122: }
1123: }
1124: }
1125: }
1126:
1127: $self->{FEEDBACK} = \%feedback;
1128: $self->{ERROR_MSG} = \%error; # what is this? JB
1129: $self->{DISCUSSION_TIME} = \%discussiontime;
1130: $self->{EMAIL_STATUS} = \%emailstatus;
1131:
1132: }
1.84 bowersj2 1133:
1134: $self->{PARM_CACHE} = {};
1.55 bowersj2 1135: }
1.51 bowersj2 1136:
1.115 bowersj2 1137: # Internal function: Takes a key to look up in the nav hash and implements internal
1138: # memory caching of that key.
1139: sub navhash {
1140: my $self = shift; my $key = shift;
1141: return $self->{NAV_HASH}->{$key};
1142: }
1143:
1.55 bowersj2 1144: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1145: sub courseMapDefined {
1146: my $self = shift;
1147: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1148:
1.115 bowersj2 1149: my $firstres = $self->navhash("map_start_$uri");
1150: my $lastres = $self->navhash("map_finish_$uri");
1.55 bowersj2 1151: return $firstres && $lastres;
1.51 bowersj2 1152: }
1153:
1154: sub getIterator {
1155: my $self = shift;
1.98 bowersj2 1156: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1.101 bowersj2 1157: shift, undef, shift);
1.51 bowersj2 1158: return $iterator;
1159: }
1160:
1161: # unties the hash when done
1162: sub untieHashes {
1163: my $self = shift;
1.60 bowersj2 1164: untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
1165: untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
1.51 bowersj2 1166: $self->{HASH_TIED} = 0;
1167: }
1168:
1169: # when the object is destroyed, be sure to untie all the hashes we tied.
1170: sub DESTROY {
1171: my $self = shift;
1172: $self->untieHashes();
1173: }
1174:
1.125 bowersj2 1175: # Private method: Does the given resource (as a symb string) have
1.59 bowersj2 1176: # current discussion? Returns 0 if chat/mail data not extracted.
1177: sub hasDiscussion {
1178: my $self = shift;
1179: my $symb = shift;
1180: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1181:
1.124 bowersj2 1182: #return defined($self->{DISCUSSION_TIME}->{$symb});
1.59 bowersj2 1183: return $self->{DISCUSSION_TIME}->{$symb} >
1.66 bowersj2 1184: $self->{LAST_CHECK};
1.59 bowersj2 1185: }
1186:
1.125 bowersj2 1187: # Private method: Does the given resource (as a symb string) have
1.59 bowersj2 1188: # current feedback? Returns the string in the feedback hash, which
1189: # will be false if it does not exist.
1190: sub getFeedback {
1191: my $self = shift;
1192: my $symb = shift;
1193:
1194: if (!defined($self->{FEEDBACK})) { return ""; }
1195:
1196: return $self->{FEEDBACK}->{$symb};
1197: }
1198:
1.125 bowersj2 1199: # Private method: Get the errors for that resource (by source).
1.124 bowersj2 1200: sub getErrors {
1201: my $self = shift;
1202: my $src = shift;
1203:
1204: if (!defined($self->{ERROR_MSG})) { return ""; }
1205: return $self->{ERROR_MSG}->{$src};
1206: }
1207:
1.51 bowersj2 1208: =pod
1209:
1210: =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.
1211:
1212: =cut
1213:
1214: # The strategy here is to cache the resource objects, and only construct them
1215: # as we use them. The real point is to prevent reading any more from the tied
1216: # hash then we have to, which should hopefully alleviate speed problems.
1217: # Caching is just an incidental detail I throw in because it makes sense.
1218:
1219: sub getById {
1220: my $self = shift;
1221: my $id = shift;
1222:
1223: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1224: {
1225: return $self->{RESOURCE_CACHE}->{$id};
1226: }
1227:
1228: # resource handles inserting itself into cache.
1229: return Apache::lonnavmaps::resource->new($self, $id);
1230: }
1231:
1232: =pod
1233:
1234: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
1235:
1236: =cut
1237:
1238: sub firstResource {
1239: my $self = shift;
1.115 bowersj2 1240: my $firstResource = $self->navhash('map_start_' .
1241: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1.51 bowersj2 1242: return $self->getById($firstResource);
1243: }
1244:
1245: =pod
1246:
1247: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
1248:
1249: =cut
1250:
1251: sub finishResource {
1252: my $self = shift;
1.115 bowersj2 1253: my $firstResource = $self->navhash('map_finish_' .
1254: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1.51 bowersj2 1255: return $self->getById($firstResource);
1256: }
1257:
1.101 bowersj2 1258: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1259: # the actual lookup; parmval caches the results.
1.51 bowersj2 1260: sub parmval {
1261: my $self = shift;
1262: my ($what,$symb)=@_;
1.84 bowersj2 1263: my $hashkey = $what."|||".$symb;
1264:
1265: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1266: return $self->{PARM_CACHE}->{$hashkey};
1267: }
1268:
1269: my $result = $self->parmval_real($what, $symb);
1270: $self->{PARM_CACHE}->{$hashkey} = $result;
1271: return $result;
1272: }
1273:
1274: sub parmval_real {
1275: my $self = shift;
1276: my ($what,$symb) = @_;
1277:
1.51 bowersj2 1278: my $cid=$ENV{'request.course.id'};
1279: my $csec=$ENV{'request.course.sec'};
1280: my $uname=$ENV{'user.name'};
1281: my $udom=$ENV{'user.domain'};
1282:
1283: unless ($symb) { return ''; }
1284: my $result='';
1285:
1286: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1287:
1288: # ----------------------------------------------------- Cascading lookup scheme
1289: my $rwhat=$what;
1290: $what=~s/^parameter\_//;
1291: $what=~s/\_/\./;
1292:
1293: my $symbparm=$symb.'.'.$what;
1294: my $mapparm=$mapname.'___(all).'.$what;
1295: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1296:
1297: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1298: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1299: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1300:
1301: my $courselevel= $usercourseprefix.'.'.$what;
1302: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1303: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1304:
1305: my $useropt = $self->{USER_OPT};
1306: my $courseopt = $self->{COURSE_OPT};
1307: my $parmhash = $self->{PARM_HASH};
1308:
1309: # ---------------------------------------------------------- first, check user
1310: if ($uname and defined($useropt)) {
1.57 albertel 1311: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1312: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1313: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1.51 bowersj2 1314: }
1315:
1316: # ------------------------------------------------------- second, check course
1317: if ($csec and defined($courseopt)) {
1.57 albertel 1318: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1319: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1320: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1.51 bowersj2 1321: }
1322:
1323: if (defined($courseopt)) {
1.57 albertel 1324: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1325: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1326: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1.51 bowersj2 1327: }
1328:
1329: # ----------------------------------------------------- third, check map parms
1330:
1331: my $thisparm=$$parmhash{$symbparm};
1.57 albertel 1332: if (defined($thisparm)) { return $thisparm; }
1.51 bowersj2 1333:
1334: # ----------------------------------------------------- fourth , check default
1335:
1336: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1.57 albertel 1337: if (defined($default)) { return $default}
1.51 bowersj2 1338:
1339: # --------------------------------------------------- fifth , cascade up parts
1340:
1341: my ($space,@qualifier)=split(/\./,$rwhat);
1342: my $qualifier=join('.',@qualifier);
1343: unless ($space eq '0') {
1344: my ($part,$id)=split(/\_/,$space);
1345: if ($id) {
1346: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1.57 albertel 1347: if (defined($partgeneral)) { return $partgeneral; }
1.51 bowersj2 1348: } else {
1349: my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
1.57 albertel 1350: if (defined($resourcegeneral)) { return $resourcegeneral; }
1.51 bowersj2 1351: }
1352: }
1353: return '';
1354: }
1355:
1356:
1357: 1;
1358:
1359: package Apache::lonnavmaps::iterator;
1360:
1361: =pod
1362:
1363: =back
1364:
1365: =head1 navmap Iterator
1366:
1367: 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.
1368:
1369: 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:
1370:
1371: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1372:
1373: To get the next thing from the iterator, call B<next>:
1374:
1375: C<my $nextThing = $resourceIterator-E<gt>next()>
1376:
1377: getIterator behaves as follows:
1378:
1379: =over 4
1380:
1.116 bowersj2 1381: =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 1382:
1.101 bowersj2 1383: 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 1384:
1385: 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:
1386:
1387: =over 4
1388:
1.70 bowersj2 1389: =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
1390:
1391: =item * END_MAP: The map is now done.
1392:
1393: =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
1394:
1395: =item * END_BRANCH: The branch is now done.
1.51 bowersj2 1396:
1397: =back
1398:
1.70 bowersj2 1399: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
1400:
1.116 bowersj2 1401: 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.
1402:
1.70 bowersj2 1403: =back
1.51 bowersj2 1404:
1405: =cut
1406:
1407: # Here are the tokens for the iterator:
1408:
1409: sub BEGIN_MAP { return 1; } # begining of a new map
1410: sub END_MAP { return 2; } # end of the map
1411: sub BEGIN_BRANCH { return 3; } # beginning of a branch
1412: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 1413: sub FORWARD { return 1; } # go forward
1414: sub BACKWARD { return 2; }
1.51 bowersj2 1415:
1.96 bowersj2 1416: sub min {
1417: (my $a, my $b) = @_;
1418: if ($a < $b) { return $a; } else { return $b; }
1419: }
1420:
1.107 bowersj2 1421: # In the CVS repository, documentation of this algorithm is included
1422: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
1423: # will reference the same location in the text as the part of the
1424: # algorithm is running through.
1425:
1.94 bowersj2 1426: sub new {
1427: # magic invocation to create a class instance
1428: my $proto = shift;
1429: my $class = ref($proto) || $proto;
1430: my $self = {};
1431:
1432: $self->{NAV_MAP} = shift;
1433: return undef unless ($self->{NAV_MAP});
1434:
1435: # Handle the parameters
1436: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1437: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1438:
1439: # If the given resources are just the ID of the resource, get the
1440: # objects
1441: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1442: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1443: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1444: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1445:
1446: $self->{FILTER} = shift;
1447:
1448: # A hash, used as a set, of resource already seen
1449: $self->{ALREADY_SEEN} = shift;
1450: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1451: $self->{CONDITION} = shift;
1452:
1.116 bowersj2 1453: # Do we want to automatically follow "redirection" maps?
1454: $self->{FORCE_TOP} = shift;
1455:
1.94 bowersj2 1456: # Now, we need to pre-process the map, by walking forward and backward
1457: # over the parts of the map we're going to look at.
1.96 bowersj2 1458:
1.97 bowersj2 1459: # The processing steps are exactly the same, except for a few small
1460: # changes, so I bundle those up in the following list of two elements:
1461: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
1462: # first_resource).
1463: # This prevents writing nearly-identical code twice.
1464: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
1465: 'FIRST_RESOURCE'],
1466: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
1467: 'FINISH_RESOURCE'] );
1468:
1.98 bowersj2 1469: my $maxDepth = 0; # tracks max depth
1470:
1.116 bowersj2 1471: # If there is only one resource in this map, and it's a map, we
1472: # want to remember that, so the user can ask for the first map
1473: # that isn't just a redirector.
1474: my $resource; my $resourceCount = 0;
1475:
1.107 bowersj2 1476: # **1**
1477:
1.97 bowersj2 1478: foreach my $pass (@iterations) {
1479: my $direction = $pass->[0];
1480: my $valName = $pass->[1];
1481: my $nextResourceMethod = $pass->[2];
1482: my $firstResourceName = $pass->[3];
1483:
1484: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
1485: $self->{FIRST_RESOURCE},
1486: $self->{FINISH_RESOURCE},
1487: {}, undef, 0, $direction);
1.96 bowersj2 1488:
1.97 bowersj2 1489: # prime the recursion
1490: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 bowersj2 1491: my $depth = 0;
1.97 bowersj2 1492: $iterator->next();
1493: my $curRes = $iterator->next();
1.98 bowersj2 1494: while ($depth > -1) {
1.97 bowersj2 1495: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
1496: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 1497:
1.97 bowersj2 1498: if (ref($curRes)) {
1.116 bowersj2 1499: # If there's only one resource, this will save it
1.117 bowersj2 1500: # we have to filter empty resources from consideration here,
1501: # or even "empty", redirecting maps have two (start & finish)
1502: # or three (start, finish, plus redirector)
1503: if($direction == FORWARD && $curRes->src()) {
1504: $resource = $curRes; $resourceCount++;
1505: }
1.97 bowersj2 1506: my $resultingVal = $curRes->{DATA}->{$valName};
1507: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 1508: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 1509:
1.116 bowersj2 1510: if ($nextCount == 1) { # **3**
1.97 bowersj2 1511: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
1512: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
1513: }
1514:
1.116 bowersj2 1515: if ($nextCount > 1) { # **4**
1.97 bowersj2 1516: foreach my $res (@{$nextResources}) {
1517: my $current = $res->{DATA}->{$valName} || 999999999;
1518: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
1519: }
1520: }
1521: }
1.96 bowersj2 1522:
1.107 bowersj2 1523: # Assign the final val (**2**)
1.97 bowersj2 1524: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 1525: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
1526: $curRes->{DATA}->{BOT_UP_VAL});
1527:
1528: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
1529: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1530: }
1.97 bowersj2 1531: $curRes = $iterator->next();
1.96 bowersj2 1532: }
1533: }
1.94 bowersj2 1534:
1.116 bowersj2 1535: # Check: Was this only one resource, a map?
1536: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
1537: my $firstResource = $resource->map_start();
1538: my $finishResource = $resource->map_finish();
1539: return
1540: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1541: $finishResource, $self->{FILTER},
1542: $self->{ALREADY_SEEN},
1543: $self->{CONDITION}, 0);
1544:
1545: }
1546:
1.98 bowersj2 1547: # Set up some bookkeeping information.
1548: $self->{CURRENT_DEPTH} = 0;
1549: $self->{MAX_DEPTH} = $maxDepth;
1550: $self->{STACK} = [];
1551: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1552:
1553: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
1554: push @{$self->{STACK}}, [];
1555: }
1556:
1.107 bowersj2 1557: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 1558: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
1559: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
1560:
1561: bless ($self);
1562:
1563: return $self;
1564: }
1565:
1566: sub next {
1567: my $self = shift;
1568:
1569: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1570: # grab the next from the recursive iterator
1571: my $next = $self->{RECURSIVE_ITERATOR}->next();
1572:
1573: # is it a begin or end map? If so, update the depth
1574: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
1575: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
1576:
1577: # Are we back at depth 0? If so, stop recursing
1578: if ($self->{RECURSIVE_DEPTH} == 0) {
1579: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1580: }
1581:
1582: return $next;
1583: }
1584:
1585: if (defined($self->{FORCE_NEXT})) {
1586: my $tmp = $self->{FORCE_NEXT};
1587: $self->{FORCE_NEXT} = undef;
1588: return $tmp;
1589: }
1590:
1591: # Have we not yet begun? If not, return BEGIN_MAP and
1592: # remember we've started.
1593: if ( !$self->{STARTED} ) {
1594: $self->{STARTED} = 1;
1595: return $self->BEGIN_MAP();
1596: }
1597:
1598: # Here's the guts of the iterator.
1599:
1600: # Find the next resource, if any.
1601: my $found = 0;
1602: my $i = $self->{MAX_DEPTH};
1603: my $newDepth;
1604: my $here;
1605: while ( $i >= 0 && !$found ) {
1.107 bowersj2 1606: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
1607: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 1608: $found = 1;
1609: $newDepth = $i;
1610: }
1611: $i--;
1612: }
1613:
1614: # If we still didn't find anything, we're done.
1615: if ( !$found ) {
1616: # We need to get back down to the correct branch depth
1617: if ( $self->{CURRENT_DEPTH} > 0 ) {
1618: $self->{CURRENT_DEPTH}--;
1619: return END_BRANCH();
1620: } else {
1621: return END_MAP();
1622: }
1623: }
1624:
1.104 bowersj2 1625: # If this is not a resource, it must be an END_BRANCH marker we want
1626: # to return directly.
1.107 bowersj2 1627: if (!ref($here)) { # **8**
1.104 bowersj2 1628: if ($here == END_BRANCH()) { # paranoia, in case of later extension
1629: $self->{CURRENT_DEPTH}--;
1630: return $here;
1631: }
1632: }
1633:
1634: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
1635: $self->{HERE} = $here;
1636:
1.98 bowersj2 1637: # Get to the right level
1638: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
1639: push @{$self->{STACK}->[$newDepth]}, $here;
1640: $self->{CURRENT_DEPTH}--;
1641: return END_BRANCH();
1642: }
1643: if ( $self->{CURRENT_DEPTH} < $newDepth) {
1644: push @{$self->{STACK}->[$newDepth]}, $here;
1645: $self->{CURRENT_DEPTH}++;
1646: return BEGIN_BRANCH();
1647: }
1648:
1649: # If we made it here, we have the next resource, and we're at the
1650: # right branch level. So let's examine the resource for where
1651: # we can get to from here.
1652:
1653: # So we need to look at all the resources we can get to from here,
1654: # categorize them if we haven't seen them, remember if we have a new
1655: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 1656: my $maxDepthAdded = -1;
1657:
1.98 bowersj2 1658: for (@$nextUnfiltered) {
1659: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 1660: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
1661: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 1662: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 1663: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 1664: }
1665: }
1.104 bowersj2 1666:
1667: # Is this the end of a branch? If so, all of the resources examined above
1668: # led to lower levels then the one we are currently at, so we push a END_BRANCH
1669: # marker onto the stack so we don't forget.
1670: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
1671: # BC branch and gets to C, it will see F as the only next resource, but it's
1672: # one level lower. Thus, this is the end of the branch, since there are no
1673: # more resources added to this level or above.
1.111 bowersj2 1674: # We don't do this if the examined resource is the finish resource,
1675: # because the condition given above is true, but the "END_MAP" will
1676: # take care of things and we should already be at depth 0.
1.104 bowersj2 1677: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 1678: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 1679: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
1680: }
1681:
1.98 bowersj2 1682: # That ends the main iterator logic. Now, do we want to recurse
1683: # down this map (if this resource is a map)?
1684: if ($self->{HERE}->is_map() &&
1685: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1686: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
1687: my $firstResource = $self->{HERE}->map_start();
1688: my $finishResource = $self->{HERE}->map_finish();
1689:
1690: $self->{RECURSIVE_ITERATOR} =
1691: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1692: $finishResource, $self->{FILTER},
1693: $self->{ALREADY_SEEN}, $self->{CONDITION});
1694: }
1695:
1.116 bowersj2 1696: # If this is a blank resource, don't actually return it.
1.117 bowersj2 1697: # Should you ever find you need it, make sure to add an option to the code
1698: # that you can use; other things depend on this behavior.
1.131 ! bowersj2 1699: if (!$self->{HERE}->src() || !$self->{HERE}->browsePriv()) {
1.116 bowersj2 1700: return $self->next();
1701: }
1702:
1.98 bowersj2 1703: return $self->{HERE};
1704:
1705: }
1706:
1707: =pod
1708:
1709: 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).
1710:
1711: =cut
1712:
1713: sub getStack {
1714: my $self=shift;
1715:
1716: my @stack;
1717:
1718: $self->populateStack(\@stack);
1719:
1720: return \@stack;
1721: }
1722:
1723: # Private method: Calls the iterators recursively to populate the stack.
1724: sub populateStack {
1725: my $self=shift;
1726: my $stack = shift;
1727:
1728: push @$stack, $self->{HERE} if ($self->{HERE});
1729:
1730: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1731: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
1732: }
1.94 bowersj2 1733: }
1734:
1735: 1;
1736:
1737: package Apache::lonnavmaps::DFSiterator;
1738:
1.100 bowersj2 1739: # Not documented in the perldoc: This is a simple iterator that just walks
1740: # through the nav map and presents the resources in a depth-first search
1741: # fashion, ignorant of conditionals, randomized resources, etc. It presents
1742: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
1743: # useful for pre-processing of some kind, and is in fact used by the main
1744: # iterator that way, but that's about it.
1745: # One could imagine merging this into the init routine of the main iterator,
1746: # but this might as well be left seperate, since it is possible some other
1747: # use might be found for it. - Jeremy
1.94 bowersj2 1748:
1.117 bowersj2 1749: # Unlike the main iterator, this DOES return all resources, even blank ones.
1750: # The main iterator needs them to correctly preprocess the map.
1751:
1.94 bowersj2 1752: sub BEGIN_MAP { return 1; } # begining of a new map
1753: sub END_MAP { return 2; } # end of the map
1754: sub FORWARD { return 1; } # go forward
1755: sub BACKWARD { return 2; }
1756:
1.100 bowersj2 1757: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
1758: # filter hash ref (or undef), already seen hash or undef, condition
1759: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 1760: sub new {
1761: # magic invocation to create a class instance
1762: my $proto = shift;
1763: my $class = ref($proto) || $proto;
1764: my $self = {};
1765:
1766: $self->{NAV_MAP} = shift;
1767: return undef unless ($self->{NAV_MAP});
1768:
1769: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1770: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1771:
1772: # If the given resources are just the ID of the resource, get the
1773: # objects
1774: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1775: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1776: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1777: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1778:
1779: $self->{FILTER} = shift;
1780:
1781: # A hash, used as a set, of resource already seen
1782: $self->{ALREADY_SEEN} = shift;
1783: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 1784: $self->{CONDITION} = shift;
1.89 bowersj2 1785: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 1786:
1.100 bowersj2 1787: # Flag: Have we started yet?
1.51 bowersj2 1788: $self->{STARTED} = 0;
1789:
1790: # Should we continue calling the recursive iterator, if any?
1791: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1792: # The recursive iterator, if any
1793: $self->{RECURSIVE_ITERATOR} = undef;
1794: # Are we recursing on a map, or a branch?
1795: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
1796: # And the count of how deep it is, so that this iterator can keep track of
1797: # when to pick back up again.
1798: $self->{RECURSIVE_DEPTH} = 0;
1799:
1800: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 1801: $self->{STACK} = [];
1.51 bowersj2 1802:
1803: # Start with the first resource
1.89 bowersj2 1804: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 1805: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 1806: } else {
1.100 bowersj2 1807: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 1808: }
1.51 bowersj2 1809:
1810: bless($self);
1811: return $self;
1812: }
1813:
1814: sub next {
1815: my $self = shift;
1816:
1817: # Are we using a recursive iterator? If so, pull from that and
1818: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 1819: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 1820: # grab the next from the recursive iterator
1821: my $next = $self->{RECURSIVE_ITERATOR}->next();
1822:
1823: # is it a begin or end map? Update depth if so
1824: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
1825: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
1826:
1827: # Are we back at depth 0? If so, stop recursing.
1828: if ($self->{RECURSIVE_DEPTH} == 0) {
1829: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1830: }
1831:
1832: return $next;
1833: }
1834:
1835: # Is there a current resource to grab? If not, then return
1.100 bowersj2 1836: # END_MAP, which will end the iterator.
1837: if (scalar(@{$self->{STACK}}) == 0) {
1838: return $self->END_MAP();
1.51 bowersj2 1839: }
1840:
1841: # Have we not yet begun? If not, return BEGIN_MAP and
1842: # remember that we've started.
1843: if ( !$self->{STARTED} ) {
1844: $self->{STARTED} = 1;
1845: return $self->BEGIN_MAP;
1846: }
1847:
1848: # Get the next resource in the branch
1.100 bowersj2 1849: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 1850:
1.100 bowersj2 1851: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 1852: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
1853:
1854: # Get the next possible resources
1.90 bowersj2 1855: my $nextUnfiltered;
1.89 bowersj2 1856: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 1857: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 1858: } else {
1.90 bowersj2 1859: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 1860: }
1.51 bowersj2 1861: my $next = [];
1862:
1863: # filter the next possibilities to remove things we've
1.100 bowersj2 1864: # already seen.
1.51 bowersj2 1865: foreach (@$nextUnfiltered) {
1.52 bowersj2 1866: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1867: push @$next, $_;
1868: }
1.51 bowersj2 1869: }
1870:
1871: while (@$next) {
1.100 bowersj2 1872: # copy the next possibilities over to the stack
1873: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 1874: }
1875:
1876: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 1877: if ($self->{HERE}->is_map() &&
1.63 bowersj2 1878: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 1879: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
1880: my $firstResource = $self->{HERE}->map_start();
1881: my $finishResource = $self->{HERE}->map_finish();
1882:
1883: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 1884: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 1885: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 1886: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 1887: }
1888:
1889: return $self->{HERE};
1890: }
1891:
1.1 www 1892: 1;
1.2 www 1893:
1.51 bowersj2 1894: package Apache::lonnavmaps::resource;
1895:
1896: use Apache::lonnet;
1897:
1898: =pod
1899:
1900: =head1 Object: resource
1901:
1902: A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
1903:
1904: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
1905:
1906: You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.
1907:
1908: =head2 Public Members
1909:
1910: resource objects have a hash called DATA ($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.
1911:
1912: =head2 Methods
1913:
1914: =over 4
1915:
1.70 bowersj2 1916: =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.
1917:
1918: =back
1.51 bowersj2 1919:
1920: =cut
1921:
1922: sub new {
1923: # magic invocation to create a class instance
1924: my $proto = shift;
1925: my $class = ref($proto) || $proto;
1926: my $self = {};
1927:
1928: $self->{NAV_MAP} = shift;
1929: $self->{ID} = shift;
1930:
1931: # Store this new resource in the parent nav map's cache.
1932: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 1933: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 1934:
1935: # A hash that can be used by two-pass algorithms to store data
1936: # about this resource in. Not used by the resource object
1937: # directly.
1938: $self->{DATA} = {};
1939:
1940: bless($self);
1941:
1942: return $self;
1943: }
1944:
1.70 bowersj2 1945: # private function: simplify the NAV_HASH lookups we keep doing
1946: # pass the name, and to automatically append my ID, pass a true val on the
1947: # second param
1948: sub navHash {
1949: my $self = shift;
1950: my $param = shift;
1951: my $id = shift;
1.115 bowersj2 1952: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 1953: }
1954:
1.51 bowersj2 1955: =pod
1956:
1.70 bowersj2 1957: B<Metadata Retreival>
1958:
1.101 bowersj2 1959: 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 1960:
1961: =over 4
1962:
1.106 bowersj2 1963: =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").
1964:
1.70 bowersj2 1965: =item * B<ext>: Returns true if the resource is external.
1966:
1967: =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
1968:
1969: =item * B<kind>: Returns the kind of the resource from the compiled nav map.
1970:
1.101 bowersj2 1971: =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 1972:
1.70 bowersj2 1973: =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
1974:
1975: =item * B<src>: Returns the source for the resource.
1976:
1977: =item * B<symb>: Returns the symb for the resource.
1978:
1979: =item * B<title>: Returns the title of the resource.
1980:
1981: =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 1982:
1983: =back
1984:
1985: =cut
1986:
1987: # These info functions can be used directly, as they don't return
1988: # resource information.
1.85 bowersj2 1989: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 1990: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 1991: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 1992: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
1993: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 1994: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
1995: sub randompick {
1996: my $self = shift;
1997: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
1998: '.0.parameter_randompick'};
1999: }
1.51 bowersj2 2000: sub src {
2001: my $self=shift;
2002: return $self->navHash("src_", 1);
2003: }
2004: sub symb {
2005: my $self=shift;
2006: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2007: my $symbSrc = &Apache::lonnet::declutter($self->src());
2008: return &Apache::lonnet::declutter(
2009: $self->navHash('map_id_'.$first))
2010: . '___' . $second . '___' . $symbSrc;
2011: }
1.70 bowersj2 2012: sub title { my $self=shift; return $self->navHash("title_", 1); }
2013: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 2014: sub compTitle {
2015: my $self = shift;
2016: my $title = $self->title();
2017: if (!$title) {
2018: $title = $self->src();
2019: $title = substr($title, rindex($title, '/') + 1);
2020: }
2021: return $title;
2022: }
1.70 bowersj2 2023: =pod
2024:
2025: B<Predicate Testing the Resource>
2026:
2027: These methods are shortcuts to deciding if a given resource has a given property.
2028:
2029: =over 4
2030:
2031: =item * B<is_map>: Returns true if the resource is a map type.
2032:
2033: =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.)
2034:
2035: =item * B<is_page>: Returns true if the resource is a page.
2036:
2037: =item * B<is_problem>: Returns true if the resource is a problem.
2038:
1.101 bowersj2 2039: =item * B<is_sequence>: Returns true if the resource is a sequence.
1.70 bowersj2 2040:
2041: =back
2042:
2043: =cut
2044:
2045:
2046: sub is_html {
1.51 bowersj2 2047: my $self=shift;
2048: my $src = $self->src();
1.70 bowersj2 2049: return ($src =~ /html$/);
1.51 bowersj2 2050: }
1.70 bowersj2 2051: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2052: sub is_page {
1.51 bowersj2 2053: my $self=shift;
2054: my $src = $self->src();
1.70 bowersj2 2055: return ($src =~ /page$/);
1.51 bowersj2 2056: }
1.70 bowersj2 2057: sub is_problem {
1.51 bowersj2 2058: my $self=shift;
2059: my $src = $self->src();
1.70 bowersj2 2060: return ($src =~ /problem$/);
1.51 bowersj2 2061: }
1.70 bowersj2 2062: sub is_sequence {
1.51 bowersj2 2063: my $self=shift;
2064: my $src = $self->src();
1.70 bowersj2 2065: return ($src =~ /sequence$/);
1.51 bowersj2 2066: }
2067:
1.101 bowersj2 2068: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 2069: sub parmval {
2070: my $self = shift;
2071: my $what = shift;
2072: my $part = shift || "0";
2073: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2074: }
2075:
1.70 bowersj2 2076: =pod
2077:
2078: B<Map Methods>
2079:
2080: These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
2081:
2082: =over 4
2083:
2084: =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
2085:
2086: =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.
2087:
2088: =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
2089:
2090: =item * B<map_type>: Returns a string with the type of the map in it.
2091:
2092: =back
1.51 bowersj2 2093:
1.70 bowersj2 2094: =cut
1.51 bowersj2 2095:
2096: sub map_finish {
2097: my $self = shift;
2098: my $src = $self->src();
2099: my $res = $self->navHash("map_finish_$src", 0);
2100: $res = $self->{NAV_MAP}->getById($res);
2101: return $res;
2102: }
1.70 bowersj2 2103: sub map_pc {
2104: my $self = shift;
2105: my $src = $self->src();
2106: return $self->navHash("map_pc_$src", 0);
2107: }
1.51 bowersj2 2108: sub map_start {
2109: my $self = shift;
2110: my $src = $self->src();
2111: my $res = $self->navHash("map_start_$src", 0);
2112: $res = $self->{NAV_MAP}->getById($res);
2113: return $res;
2114: }
2115: sub map_type {
2116: my $self = shift;
2117: my $pc = $self->map_pc();
2118: return $self->navHash("map_type_$pc", 0);
2119: }
2120:
2121:
2122:
2123: #####
2124: # Property queries
2125: #####
2126:
2127: # These functions will be responsible for returning the CORRECT
2128: # VALUE for the parameter, no matter what. So while they may look
2129: # like direct calls to parmval, they can be more then that.
2130: # So, for instance, the duedate function should use the "duedatetype"
2131: # information, rather then the resource object user.
2132:
2133: =pod
2134:
2135: =head2 Resource Parameters
2136:
1.70 bowersj2 2137: 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 2138:
2139: 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.)
2140:
2141: =over 4
2142:
2143: =item * B<acc>: Get the Client IP/Name Access Control information.
2144:
2145: =item * B<answerdate>: Get the answer-reveal date for the problem.
2146:
2147: =item * B<duedate>: Get the due date for the problem.
2148:
2149: =item * B<tries>: Get the number of tries the student has used on the problem.
2150:
2151: =item * B<maxtries>: Get the number of max tries allowed.
2152:
2153: =item * B<opendate>: Get the open date for the problem.
2154:
2155: =item * B<sig>: Get the significant figures setting.
2156:
2157: =item * B<tol>: Get the tolerance for the problem.
2158:
1.70 bowersj2 2159: =item * B<tries>: Get the number of tries the user has already used on the problem.
2160:
1.51 bowersj2 2161: =item * B<type>: Get the question type for the problem.
2162:
2163: =item * B<weight>: Get the weight for the problem.
2164:
2165: =back
2166:
2167: =cut
2168:
2169: sub acc {
2170: (my $self, my $part) = @_;
2171: return $self->parmval("acc", $part);
2172: }
2173: sub answerdate {
2174: (my $self, my $part) = @_;
2175: # Handle intervals
2176: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2177: return $self->duedate($part) +
2178: $self->parmval("answerdate", $part);
2179: }
2180: return $self->parmval("answerdate", $part);
1.106 bowersj2 2181: }
1.108 bowersj2 2182: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
1.51 bowersj2 2183: sub duedate {
2184: (my $self, my $part) = @_;
2185: return $self->parmval("duedate", $part);
2186: }
2187: sub maxtries {
2188: (my $self, my $part) = @_;
2189: return $self->parmval("maxtries", $part);
2190: }
2191: sub opendate {
2192: (my $self, my $part) = @_;
2193: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2194: return $self->duedate($part) -
2195: $self->parmval("opendate", $part);
2196: }
2197: return $self->parmval("opendate");
2198: }
2199: sub sig {
2200: (my $self, my $part) = @_;
2201: return $self->parmval("sig", $part);
2202: }
2203: sub tol {
2204: (my $self, my $part) = @_;
2205: return $self->parmval("tol", $part);
2206: }
1.108 bowersj2 2207: sub tries {
2208: my $self = shift;
2209: my $tries = $self->queryRestoreHash('tries', shift);
2210: if (!defined($tries)) { return '0';}
1.51 bowersj2 2211: return $tries;
2212: }
1.70 bowersj2 2213: sub type {
2214: (my $self, my $part) = @_;
2215: return $self->parmval("type", $part);
2216: }
1.109 bowersj2 2217: sub weight {
2218: my $self = shift; my $part = shift;
1.70 bowersj2 2219: return $self->parmval("weight", $part);
2220: }
1.51 bowersj2 2221:
2222: # Multiple things need this
2223: sub getReturnHash {
2224: my $self = shift;
2225:
2226: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 2227: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 2228: $self->{RETURN_HASH} = \%tmpHash;
2229: }
2230: }
2231:
2232: ######
2233: # Status queries
2234: ######
2235:
2236: # These methods query the status of problems.
2237:
2238: # If we need to count parts, this function determines the number of
2239: # parts from the metadata. When called, it returns a reference to a list
2240: # of strings corresponding to the parts. (Thus, using it in a scalar context
2241: # tells you how many parts you have in the problem:
2242: # $partcount = scalar($resource->countParts());
2243: # Don't use $self->{PARTS} directly because you don't know if it's been
2244: # computed yet.
2245:
2246: =pod
2247:
2248: =head2 Resource misc
2249:
2250: Misc. functions for the resource.
2251:
2252: =over 4
2253:
1.59 bowersj2 2254: =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.
2255:
2256: =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:
2257:
2258: for (split(/\,/, $res->getFeedback())) {
2259: my $link = &Apache::lonnet::escape($_);
2260: ...
2261:
2262: and use the link as appropriate.
2263:
2264: =cut
2265:
2266: sub hasDiscussion {
2267: my $self = shift;
2268: return $self->{NAV_MAP}->hasDiscussion($self->symb());
2269: }
2270:
2271: sub getFeedback {
2272: my $self = shift;
1.124 bowersj2 2273: my $source = $self->src();
1.125 bowersj2 2274: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 2275: return $self->{NAV_MAP}->getFeedback($source);
2276: }
2277:
2278: sub getErrors {
2279: my $self = shift;
2280: my $source = $self->src();
2281: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
2282: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 2283: }
2284:
2285: =pod
2286:
1.70 bowersj2 2287: =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 2288:
1.70 bowersj2 2289: =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 2290:
2291: =back
2292:
2293: =cut
2294:
2295: sub parts {
2296: my $self = shift;
2297:
1.67 bowersj2 2298: if ($self->ext) { return ['0']; }
2299:
1.51 bowersj2 2300: $self->extractParts();
2301: return $self->{PARTS};
2302: }
2303:
2304: sub countParts {
2305: my $self = shift;
2306:
2307: my $parts = $self->parts();
1.66 bowersj2 2308:
2309: if ($self->{RESOURCE_ERROR}) {
2310: return 0;
2311: }
2312:
2313: if (scalar(@{$parts}) < 2) { return 1;}
1.51 bowersj2 2314:
2315: return scalar(@{$parts}) - 1;
2316: }
2317:
2318: # Private function: Extracts the parts information and saves it
2319: sub extractParts {
2320: my $self = shift;
2321:
2322: return if ($self->{PARTS});
1.67 bowersj2 2323: return if ($self->ext);
1.51 bowersj2 2324:
2325: $self->{PARTS} = [];
2326:
1.82 bowersj2 2327: # Retrieve part count, if this is a problem
2328: if ($self->is_problem()) {
2329: my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys');
2330: if (!$metadata) {
2331: $self->{RESOURCE_ERROR} = 1;
2332: $self->{PARTS} = [];
2333: return;
2334: }
2335:
2336: foreach (split(/\,/,$metadata)) {
2337: if ($_ =~ /^parameter\_(.*)\_opendate$/) {
2338: push @{$self->{PARTS}}, $1;
2339: }
1.51 bowersj2 2340: }
1.82 bowersj2 2341:
2342:
2343: # Is this possible to do in one line? - Jeremy
2344: my @sortedParts = sort @{$self->{PARTS}};
2345: $self->{PARTS} = \@sortedParts;
1.51 bowersj2 2346: }
2347:
2348: return;
2349: }
2350:
2351: =pod
2352:
2353: =head2 Resource Status
2354:
1.101 bowersj2 2355: Problem resources have status information, reflecting their various dates and completion statuses.
1.51 bowersj2 2356:
2357: There are two aspects to the status: the date-related information and the completion information.
2358:
2359: Idiomatic usage of these two methods would probably look something like
2360:
2361: foreach ($resource->parts()) {
2362: my $dateStatus = $resource->getDateStatus($_);
2363: my $completionStatus = $resource->getCompletionStatus($_);
2364:
1.70 bowersj2 2365: or
2366:
2367: my $status = $resource->status($_);
2368:
1.51 bowersj2 2369: ... use it here ...
2370: }
2371:
1.101 bowersj2 2372: 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.
2373:
2374: The symbolic constants shown below can be accessed through the resource object: $res->OPEN.
2375:
1.51 bowersj2 2376: =over 4
2377:
1.70 bowersj2 2378: =item * B<getDateStatus>($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 2379:
2380: =back
2381:
2382: B<Date Codes>
2383:
2384: =over 4
2385:
2386: =item * B<OPEN_LATER>: The problem will be opened later.
2387:
2388: =item * B<OPEN>: Open and not yet due.
2389:
1.59 bowersj2 2390:
1.54 bowersj2 2391: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
2392:
2393: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51 bowersj2 2394:
2395: =item * B<ANSWER_OPEN>: The answer date is here.
2396:
2397: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
2398:
2399: =back
2400:
2401: =cut
2402:
2403: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 2404: sub OPEN_LATER { return 0; }
2405: sub OPEN { return 1; }
2406: sub PAST_DUE_NO_ANSWER { return 2; }
2407: sub PAST_DUE_ANSWER_LATER { return 3; }
2408: sub ANSWER_OPEN { return 4; }
2409: sub NOTHING_SET { return 5; }
2410: sub NETWORK_FAILURE { return 100; }
2411:
2412: # getDateStatus gets the date status for a given problem part.
2413: # Because answer date, due date, and open date are fully independent
2414: # (i.e., it is perfectly possible to *only* have an answer date),
2415: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
2416: # (past, future, none given). This function handles this with a decision
2417: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 2418:
2419: sub getDateStatus {
2420: my $self = shift;
2421: my $part = shift;
2422: $part = "0" if (!defined($part));
1.54 bowersj2 2423:
2424: # Always return network failure if there was one.
1.51 bowersj2 2425: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2426:
2427: my $now = time();
2428:
1.53 bowersj2 2429: my $open = $self->opendate($part);
2430: my $due = $self->duedate($part);
2431: my $answer = $self->answerdate($part);
2432:
2433: if (!$open && !$due && !$answer) {
2434: # no data on the problem at all
2435: # should this be the same as "open later"? think multipart.
2436: return $self->NOTHING_SET;
2437: }
1.59 bowersj2 2438: if (!$open || $now < $open) {return $self->OPEN_LATER}
2439: if (!$due || $now < $due) {return $self->OPEN}
2440: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
2441: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 2442: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 2443: }
2444:
2445: =pod
2446:
2447: B<>
2448:
2449: =over 4
2450:
2451: =item * B<getCompletionStatus>($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:
2452:
2453: =back
2454:
2455: B<Completion Codes>
2456:
2457: =over 4
2458:
2459: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
2460:
2461: =item * B<INCORRECT>: Attempted, but wrong by student.
2462:
2463: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
2464:
2465: =item * B<CORRECT>: Correct or correct by instructor.
2466:
2467: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
2468:
2469: =item * B<EXCUSED>: Excused. Not yet implemented.
2470:
2471: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
2472:
1.69 bowersj2 2473: =item * B<ATTEMPTED>: Attempted, and not yet graded.
2474:
1.51 bowersj2 2475: =back
2476:
2477: =cut
2478:
1.53 bowersj2 2479: sub NOT_ATTEMPTED { return 10; }
2480: sub INCORRECT { return 11; }
2481: sub INCORRECT_BY_OVERRIDE { return 12; }
2482: sub CORRECT { return 13; }
2483: sub CORRECT_BY_OVERRIDE { return 14; }
2484: sub EXCUSED { return 15; }
1.69 bowersj2 2485: sub ATTEMPTED { return 16; }
1.51 bowersj2 2486:
2487: sub getCompletionStatus {
2488: my $self = shift;
2489: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2490:
1.108 bowersj2 2491: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 2492:
2493: # Left as seperate if statements in case we ever do more with this
2494: if ($status eq 'correct_by_student') {return $self->CORRECT;}
2495: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
2496: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
2497: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
2498: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 2499: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 2500: return $self->NOT_ATTEMPTED;
1.108 bowersj2 2501: }
2502:
2503: sub queryRestoreHash {
2504: my $self = shift;
2505: my $hashentry = shift;
2506: my $part = shift;
2507: $part = "0" if (!defined($part));
2508: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2509:
2510: $self->getReturnHash();
2511:
2512: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 2513: }
2514:
2515: =pod
2516:
2517: B<Composite Status>
2518:
1.101 bowersj2 2519: Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):
1.51 bowersj2 2520:
2521: =over 4
2522:
1.70 bowersj2 2523: =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
1.51 bowersj2 2524:
1.70 bowersj2 2525: =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 2526:
1.70 bowersj2 2527: =item * B<CORRECT>: For any reason at all, the part is considered correct.
1.51 bowersj2 2528:
1.70 bowersj2 2529: =item * B<EXCUSED>: For any reason at all, the problem is excused.
1.51 bowersj2 2530:
1.70 bowersj2 2531: =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
1.54 bowersj2 2532:
1.70 bowersj2 2533: =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 2534:
1.70 bowersj2 2535: =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
1.51 bowersj2 2536:
1.70 bowersj2 2537: =item * B<OPEN_LATER>: The problem is not yet open.
1.51 bowersj2 2538:
1.70 bowersj2 2539: =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
1.51 bowersj2 2540:
1.70 bowersj2 2541: =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
1.51 bowersj2 2542:
1.70 bowersj2 2543: =item * B<OPEN>: The item is open and not yet tried.
1.51 bowersj2 2544:
1.70 bowersj2 2545: =item * B<ATTEMPTED>: The problem has been attempted.
1.69 bowersj2 2546:
1.51 bowersj2 2547: =back
2548:
2549: =cut
2550:
2551: sub TRIES_LEFT { return 10; }
2552:
2553: sub status {
2554: my $self = shift;
2555: my $part = shift;
2556: if (!defined($part)) { $part = "0"; }
2557: my $completionStatus = $self->getCompletionStatus($part);
2558: my $dateStatus = $self->getDateStatus($part);
2559:
2560: # What we have is a two-dimensional matrix with 4 entries on one
2561: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 2562: # plus network failure and "no date data at all".
1.51 bowersj2 2563:
1.53 bowersj2 2564: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 2565:
2566: # There are a few whole rows we can dispose of:
1.53 bowersj2 2567: if ($completionStatus == CORRECT ||
2568: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.69 bowersj2 2569: return CORRECT;
2570: }
2571:
2572: if ($completionStatus == ATTEMPTED) {
2573: return ATTEMPTED;
1.53 bowersj2 2574: }
2575:
2576: # If it's EXCUSED, then return that no matter what
2577: if ($completionStatus == EXCUSED) {
2578: return EXCUSED;
1.51 bowersj2 2579: }
2580:
1.53 bowersj2 2581: if ($dateStatus == NOTHING_SET) {
2582: return NOTHING_SET;
1.51 bowersj2 2583: }
2584:
1.69 bowersj2 2585: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
2586: # by 4 matrix (date statuses).
1.51 bowersj2 2587:
1.54 bowersj2 2588: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 2589: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 2590: return $dateStatus;
1.51 bowersj2 2591: }
2592:
1.53 bowersj2 2593: if ($dateStatus == ANSWER_OPEN) {
2594: return ANSWER_OPEN;
1.51 bowersj2 2595: }
2596:
2597: # Now: (incorrect, incorrect_override, not_attempted) x
2598: # (open_later), (open)
2599:
1.53 bowersj2 2600: if ($dateStatus == OPEN_LATER) {
2601: return OPEN_LATER;
1.51 bowersj2 2602: }
2603:
2604: # If it's WRONG...
1.53 bowersj2 2605: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 2606: # and there are TRIES LEFT:
1.79 bowersj2 2607: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 2608: return TRIES_LEFT;
1.51 bowersj2 2609: }
1.53 bowersj2 2610: return INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 2611: }
2612:
2613: # Otherwise, it's untried and open
1.53 bowersj2 2614: return OPEN;
1.51 bowersj2 2615: }
2616:
2617: =pod
2618:
2619: =head2 Resource/Nav Map Navigation
2620:
2621: =over 4
2622:
1.101 bowersj2 2623: =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 2624:
1.101 bowersj2 2625: =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 2626:
2627: =cut
2628:
2629: sub getNext {
2630: my $self = shift;
2631: my @branches;
2632: my $to = $self->to();
1.85 bowersj2 2633: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 2634: my $choice = $self->{NAV_MAP}->getById($branch);
2635: my $next = $choice->goesto();
2636: $next = $self->{NAV_MAP}->getById($next);
2637:
1.131 ! bowersj2 2638: push @branches, $next;
1.85 bowersj2 2639: }
2640: return \@branches;
2641: }
2642:
2643: sub getPrevious {
2644: my $self = shift;
2645: my @branches;
2646: my $from = $self->from();
2647: foreach my $branch ( split /,/, $from) {
2648: my $choice = $self->{NAV_MAP}->getById($branch);
2649: my $prev = $choice->comesfrom();
2650: $prev = $self->{NAV_MAP}->getById($prev);
2651:
1.131 ! bowersj2 2652: push @branches, $prev;
1.51 bowersj2 2653: }
2654: return \@branches;
1.131 ! bowersj2 2655: }
! 2656:
! 2657: sub browsePriv {
! 2658: my $self = shift;
! 2659: if (defined($self->{BROWSE_PRIV})) {
! 2660: return $self->{BROWSE_PRIV};
! 2661: }
! 2662:
! 2663: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 2664: }
2665:
2666: =pod
1.2 www 2667:
1.51 bowersj2 2668: =back
1.2 www 2669:
1.51 bowersj2 2670: =cut
1.2 www 2671:
1.51 bowersj2 2672: 1;
1.2 www 2673:
1.51 bowersj2 2674: __END__
1.2 www 2675:
2676:
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