Annotation of loncom/interface/lonnavmaps.pm, revision 1.122
1.72 bowersj2 1:
1.2 www 2: # The LearningOnline Network with CAPA
3: # Navigate Maps Handler
1.1 www 4: #
1.122 ! www 5: # $Id: lonnavmaps.pm,v 1.121 2002/12/02 14:22:50 bowersj2 Exp $
1.20 albertel 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.2 www 29: # (Page Handler
1.1 www 30: #
1.2 www 31: # (TeX Content Handler
1.1 www 32: #
1.2 www 33: # 05/29/00,05/30 Gerd Kortemeyer)
34: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
35: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
1.1 www 36: #
1.17 www 37: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
1.21 www 38: # YEAR=2002
39: # 1/1 Gerd Kortemeyer
1.105 bowersj2 40: # Oct-Nov Jeremy Bowers
1.2 www 41:
1.1 www 42: package Apache::lonnavmaps;
43:
44: use strict;
1.2 www 45: use Apache::Constants qw(:common :http);
1.18 albertel 46: use Apache::loncommon();
1.73 bowersj2 47: use POSIX qw (floor strftime);
1.2 www 48:
1.1 www 49: sub handler {
1.99 bowersj2 50: my $r = shift;
1.118 bowersj2 51: real_handler($r);
52: }
53:
54: sub real_handler {
55: my $r = shift;
1.2 www 56:
1.51 bowersj2 57: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
58:
59: # Handle header-only request
60: if ($r->header_only) {
61: if ($ENV{'browser.mathml'}) {
62: $r->content_type('text/xml');
63: } else {
64: $r->content_type('text/html');
65: }
66: $r->send_http_header;
67: return OK;
68: }
69:
70: # Send header, don't cache this page
71: if ($ENV{'browser.mathml'}) {
72: $r->content_type('text/xml');
73: } else {
74: $r->content_type('text/html');
75: }
76: &Apache::loncommon::no_cache($r);
77: $r->send_http_header;
78:
1.106 bowersj2 79: # Create the nav map
1.51 bowersj2 80: my $navmap = Apache::lonnavmaps::navmap->new(
81: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 82: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 83:
1.55 bowersj2 84:
85: if (!defined($navmap)) {
86: my $requrl = $r->uri;
87: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
88: return HTTP_NOT_ACCEPTABLE;
89: }
1.64 bowersj2 90:
1.111 bowersj2 91: $r->print("<html><head>\n");
1.118 bowersj2 92: $r->print("<title>Navigate Course Contents</title></head>");
1.111 bowersj2 93:
1.64 bowersj2 94: # Header
1.111 bowersj2 95: $r->print(&Apache::loncommon::bodytag('Navigate Course Contents','',
1.64 bowersj2 96: ''));
97: $r->print('<script>window.focus();</script>');
1.101 bowersj2 98:
1.95 bowersj2 99: $r->print('<table border="0" cellpadding="2" cellspacing="0">');
1.64 bowersj2 100: my $date=localtime;
1.95 bowersj2 101: $r->print('<tr><td align="right" valign="bottom">Key: </td>');
1.101 bowersj2 102:
103: # Print discussions and feedback header
1.65 bowersj2 104: if ($navmap->{LAST_CHECK}) {
1.95 bowersj2 105: $r->print('<td align="center" valign="bottom"> '.
106: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1.73 bowersj2 107: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1.95 bowersj2 108: '</td><td align="center" valign="bottom"> '.
109: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
110: '</td>');
111: } else {
112: $r->print('<td align="center" valign="bottom"> '.
113: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
114: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
115: '</td>');
116: }
117: $r->print('</tr></table>');
1.101 bowersj2 118:
1.95 bowersj2 119: my $condition = 0;
120: if ($ENV{'form.condition'}) {
121: $condition = 1;
122: }
123:
1.118 bowersj2 124: # Determine where the "here" marker is and where the screen jumps to.
125: my $SYMB = 1; my $URL = 2; my $NOTHING = 3; # symbolic constants
126: my $hereType; # the type of marker, $SYMB, $URL, or $NOTHING
127: my $here; # the actual URL or SYMB for the here marker
128: my $jumpType; # The type of the thing we have a jump for, $SYMB or $URL
129: my $jump; # the SYMB/URL of the resource we need to jump to
130:
131: if ( $ENV{'form.alreadyHere'} ) { # we came from a user's manipulation of the nav page
132: # If this is a click on a folder or something, we want to preserve the "here"
133: # from the querystring, and get the new "jump" marker
134: $hereType = $ENV{'form.hereType'};
135: $here = $ENV{'form.here'};
136: $jumpType = $ENV{'form.jumpType'} || $NOTHING;
137: $jump = $ENV{'form.jump'};
138: } else { # the user is visiting the nav map from the remote
139: # We're coming from the remote. We have either a url, a symb, or nothing,
140: # and we need to figure out what.
141: # Preference: Symb
142:
143: if ($ENV{'form.symb'}) {
144: $hereType = $jumpType = $SYMB;
145: $here = $jump = $ENV{'form.symb'};
146: } elsif ($ENV{'form.postdata'}) {
147: # couldn't find a symb, is there a URL?
148: my $currenturl = $ENV{'form.postdata'};
149: $currenturl=~s/^http\:\/\///;
150: $currenturl=~s/^[^\/]+//;
151:
152: $hereType = $jumpType = $URL;
153: $here = $jump = $currenturl;
154: } else {
155: # Nothing
156: $hereType = $jumpType = $NOTHING;
157: }
158: }
1.110 bowersj2 159:
1.118 bowersj2 160:
1.110 bowersj2 161: # alreadyHere allows us to only open the maps necessary to view
162: # the current location once, while at the same time remembering
163: # the current location. Without that check, the user would never
164: # be able to close those maps; the user would close it, and the
165: # currenturl scan would re-open it.
1.118 bowersj2 166: my $queryAdd = "&alreadyHere=1";
1.110 bowersj2 167:
1.95 bowersj2 168: if ($condition) {
1.118 bowersj2 169: $r->print("<a href=\"navmaps?condition=0&filter=&$queryAdd" .
170: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
171: "\">Close All Folders</a>");
1.65 bowersj2 172: } else {
1.118 bowersj2 173: $r->print("<a href=\"navmaps?condition=1&filter=&$queryAdd" .
174: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
175: "\">Open All Folders</a>");
1.65 bowersj2 176: }
1.55 bowersj2 177:
1.95 bowersj2 178: $r->print('<br> ');
179: $r->rflush();
180:
1.92 bowersj2 181: # Now that we've displayed some stuff to the user, init the navmap
182: $navmap->init();
183:
1.55 bowersj2 184: # Check that it's defined
185: if (!($navmap->courseMapDefined())) {
186: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
187: '</body></html>');
188: return OK;
189: }
190:
1.51 bowersj2 191: # Grab a resource object so we have access to the constants; this
192: # is technically not proper, but should be harmless
193: my $res = $navmap->firstResource();
194:
1.101 bowersj2 195: # These are some data tables, which make it easy to change some of
196: # of the specific visualization parameters if desired.
197:
1.51 bowersj2 198: # Defines a status->color mapping, null string means don't color
199: my %colormap =
1.54 bowersj2 200: ( $res->NETWORK_FAILURE => '',
1.59 bowersj2 201: $res->CORRECT => '',
1.112 bowersj2 202: $res->EXCUSED => '#3333FF',
1.59 bowersj2 203: $res->PAST_DUE_ANSWER_LATER => '',
204: $res->PAST_DUE_NO_ANSWER => '',
1.112 bowersj2 205: $res->ANSWER_OPEN => '#006600',
1.54 bowersj2 206: $res->OPEN_LATER => '',
1.59 bowersj2 207: $res->TRIES_LEFT => '',
208: $res->INCORRECT => '',
209: $res->OPEN => '',
1.54 bowersj2 210: $res->NOTHING_SET => '' );
1.59 bowersj2 211: # And a special case in the nav map; what to do when the assignment
212: # is not yet done and due in less then 24 hours
1.86 bowersj2 213: my $hurryUpColor = "#FF0000";
1.59 bowersj2 214:
1.115 bowersj2 215: # Keep these mappings in sync with lonquickgrades, which uses the colors
216: # instead of the icons.
1.59 bowersj2 217: my %statusIconMap =
1.66 bowersj2 218: ( $res->NETWORK_FAILURE => '',
219: $res->NOTHING_SET => '',
220: $res->CORRECT => 'navmap.correct.gif',
221: $res->EXCUSED => 'navmap.correct.gif',
222: $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
223: $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
224: $res->ANSWER_OPEN => 'navmap.wrong.gif',
225: $res->OPEN_LATER => '',
226: $res->TRIES_LEFT => 'navmap.open.gif',
227: $res->INCORRECT => 'navmap.wrong.gif',
1.69 bowersj2 228: $res->OPEN => 'navmap.open.gif',
1.85 bowersj2 229: $res->ATTEMPTED => 'navmap.open.gif' );
1.69 bowersj2 230:
231: my %iconAltTags =
232: ( 'navmap.correct.gif' => 'Correct',
233: 'navmap.wrong.gif' => 'Incorrect',
234: 'navmap.open.gif' => 'Open' );
1.59 bowersj2 235:
236: my %condenseStatuses =
1.66 bowersj2 237: ( $res->NETWORK_FAILURE => 1,
238: $res->NOTHING_SET => 1,
239: $res->CORRECT => 1 );
1.51 bowersj2 240:
241: my %filterHash;
242: # Figure out what we're not displaying
243: foreach (split(/\,/, $ENV{"form.filter"})) {
244: if ($_) {
245: $filterHash{$_} = "1";
246: }
247: }
248:
1.88 bowersj2 249: # Is this a new-style course? If so, we want to suppress showing the top-level
250: # maps in their own folders, in favor of "inlining" them.
251: my $topResource = $navmap->getById("0.0");
1.63 bowersj2 252:
1.51 bowersj2 253: # Begin the HTML table
1.59 bowersj2 254: # four cols: resource + indent, chat+feedback, icon, text string
1.85 bowersj2 255: $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
1.51 bowersj2 256:
1.74 bowersj2 257: # This needs to be updated to use symbs from the remote,
258: # instead of uris. The changes to this and the main rendering
259: # loop should be obvious.
260: # Here's a simple example of the iterator.
1.88 bowersj2 261: # Preprocess the map: Look for current URL, force inlined maps to display
262:
1.118 bowersj2 263: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.88 bowersj2 264: my $found = 0;
265: my $depth = 1;
1.118 bowersj2 266: my $currentJumpIndex = 0; # keeps track of when the current resource is found,
1.91 bowersj2 267: # so we can back up a few and put the anchor above the
268: # current resource
1.118 bowersj2 269: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1.101 bowersj2 270: # before the current resource when using #current
1.88 bowersj2 271: $mapIterator->next(); # discard the first BEGIN_MAP
272: my $curRes = $mapIterator->next();
1.91 bowersj2 273: my $counter = 0;
1.118 bowersj2 274: my $foundJump = ($jumpType == $NOTHING); # look for jump point if we have one
275: my $looped = 0;
1.116 bowersj2 276:
277: # We only need to do this if we need to open the maps to show the
1.118 bowersj2 278: # current position. This will change the counter so we can't count
279: # for the jump marker with this loop.
1.116 bowersj2 280: while ($depth > 0 && !$ENV{'form.alreadyHere'}) {
1.96 bowersj2 281: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
282: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.120 bowersj2 283:
1.118 bowersj2 284: if (ref($curRes) && !$ENV{'form.alreadyHere'} &&
285: ($hereType == $SYMB && $curRes->symb() eq $here) ||
1.119 bowersj2 286: (ref($curRes) && $hereType == $URL && $curRes->src() eq $here)) {
1.118 bowersj2 287: my $mapStack = $mapIterator->getStack();
288:
289: # Ensure the parent maps are open
290: for my $map (@{$mapStack}) {
291: if ($condition) {
292: undef $filterHash{$map->map_pc()};
293: } else {
294: $filterHash{$map->map_pc()} = 1;
295: }
296: }
297: $ENV{'form.alreadyHere'} = 1;
298: }
299: $looped = 1;
300:
301: $curRes = $mapIterator->next();
302: }
303:
304: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 0);
305: $depth = 1;
306: $mapIterator->next();
307: $curRes = $mapIterator->next();
1.88 bowersj2 308:
1.118 bowersj2 309: while ($depth > 0 && !$foundJump) {
310: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
311: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.91 bowersj2 312: if (ref($curRes)) { $counter++; }
313:
1.118 bowersj2 314: if (ref($curRes) &&
315: (($jumpType == $SYMB && $curRes->symb() eq $jump) ||
316: ($jumpType == $URL && $curRes->src() eq $jump))) {
1.88 bowersj2 317: # If this is the correct resource, be sure to
318: # show it by making sure the containing maps
319: # are open.
1.91 bowersj2 320:
1.101 bowersj2 321: # This is why we have to use the main iterator instead of the
322: # potentially faster DFS: The count has to be the same, so
323: # the order has to be the same, which DFS won't give us.
1.118 bowersj2 324: $currentJumpIndex = $counter;
325: $foundJump = 1;
1.88 bowersj2 326: }
1.118 bowersj2 327:
1.88 bowersj2 328: $curRes = $mapIterator->next();
1.74 bowersj2 329: }
1.88 bowersj2 330:
1.53 bowersj2 331: undef $res; # so we don't accidentally use it later
1.72 bowersj2 332: my $indentLevel = 0;
1.61 bowersj2 333: my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";
1.51 bowersj2 334:
335: my $isNewBranch = 0;
1.59 bowersj2 336: my $now = time();
337: my $in24Hours = $now + 24 * 60 * 60;
1.78 bowersj2 338: my $displayedHereMarker = 0;
1.118 bowersj2 339: my $displayedJumpMarker = 0;
1.88 bowersj2 340:
1.72 bowersj2 341: # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
342: # code in iterator->next), so ignore the first one
1.89 bowersj2 343: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
1.74 bowersj2 344: $condition);
1.72 bowersj2 345: $mapIterator->next();
1.89 bowersj2 346: $curRes = $mapIterator->next();
1.90 bowersj2 347: $depth = 1;
1.88 bowersj2 348:
349: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
350: my $rowNum = 0;
1.51 bowersj2 351:
1.91 bowersj2 352: $counter = 0;
353:
1.72 bowersj2 354: while ($depth > 0) {
1.51 bowersj2 355: if ($curRes == $mapIterator->BEGIN_MAP() ||
1.52 bowersj2 356: $curRes == $mapIterator->BEGIN_BRANCH()) {
1.51 bowersj2 357: $indentLevel++;
358: }
359: if ($curRes == $mapIterator->END_MAP() ||
1.52 bowersj2 360: $curRes == $mapIterator->END_BRANCH()) {
1.51 bowersj2 361: $indentLevel--;
362: }
1.52 bowersj2 363: if ($curRes == $mapIterator->BEGIN_BRANCH()) {
364: $isNewBranch = 1;
1.72 bowersj2 365: }
1.96 bowersj2 366: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
367: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.51 bowersj2 368:
1.91 bowersj2 369: if (ref($curRes)) { $counter++; }
370:
1.101 bowersj2 371: # Is this resource being ignored because it is in a random-out
372: # map and it was not selected?
1.68 bowersj2 373: if (ref($curRes) && !advancedUser() && $curRes->randomout()) {
374: $curRes = $mapIterator->next();
1.101 bowersj2 375: next; # if yes, then just ignore this resource
1.68 bowersj2 376: }
377:
1.116 bowersj2 378: if (ref($curRes)) {
1.51 bowersj2 379:
1.113 bowersj2 380: my $deltalevel = $isNewBranch? 1 : 0; # reserves space for branch icon
381:
1.116 bowersj2 382: if ($indentLevel - $deltalevel < 0) {
1.113 bowersj2 383: # If this would be at a negative depth (top-level maps in
384: # new-style courses, we want to suppress their title display)
385: # then ignore it.
386: $curRes = $mapIterator->next();
387: next;
388: }
389:
1.66 bowersj2 390: # Step one: Decide which parts to show
391: my @parts = @{$curRes->parts()};
392: my $multipart = scalar(@parts) > 1;
393: my $condensed = 0;
394:
1.51 bowersj2 395: if ($curRes->is_problem()) {
1.101 bowersj2 396:
1.66 bowersj2 397: # Is it multipart?
398: if ($multipart) {
399: # If it's multipart, see if part 0 is "open"
400: # if it is, display all parts, if it isn't,
401: # just display first
402: if (!$curRes->opendate("0")) {
1.101 bowersj2 403: # no parts are open, display as one part
404: @parts = ("0");
1.68 bowersj2 405: $condensed = 1;
1.66 bowersj2 406: } else {
407: # Otherwise, only display part 0 if we want to
408: # attach feedback or email information to it
409: if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
410: shift @parts;
411: } else {
412: # Now, we decide whether to condense the
413: # parts due to similarity
414: my $status = $curRes->status($parts[1]);
415: my $due = $curRes->duedate($parts[1]);
416: my $open = $curRes->opendate($parts[1]);
417: my $statusAllSame = 1;
418: my $dueAllSame = 1;
419: my $openAllSame = 1;
420: for (my $i = 2; $i < scalar(@parts); $i++) {
421: if ($curRes->status($parts[$i]) != $status){
422: $statusAllSame = 0;
423: }
424: if ($curRes->duedate($parts[$i]) != $due ) {
425: $dueAllSame = 0;
426: }
427: if ($curRes->opendate($parts[$i]) != $open) {
428: $openAllSame = 0;
429: }
430: }
431:
432: # $allSame is true if all the statuses were
433: # the same. Now, if they are all the same and
434: # match one of the statuses to condense, or they
435: # are all open with the same due date, or they are
436: # all OPEN_LATER with the same open date, display the
437: # status of the first non-zero part (to get the 'correct'
438: # status right, since 0 is never 'correct' or 'open').
439: if (($statusAllSame && defined($condenseStatuses{$status})) ||
440: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
441: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
442: @parts = ($parts[1]);
443: $condensed = 1;
444: }
445: }
446: }
447: }
1.59 bowersj2 448:
1.51 bowersj2 449: } else {
1.84 bowersj2 450: $parts[0] = "0"; # this is to get past foreach loop below
1.51 bowersj2 451: # you can consider a non-problem resource as a resource
1.101 bowersj2 452: # with only one part without loss, and it simplifies the looping
1.51 bowersj2 453: }
454:
1.83 bowersj2 455: # Is it a multipart problem with a single part, now in
1.101 bowersj2 456: # @parts with "0" filtered out? If so, 'forget' it's a multi-part
1.83 bowersj2 457: # problem and treat it like a single-part problem.
458: if ( scalar(@parts) == 1 ) {
459: $multipart = 0;
460: }
461:
1.66 bowersj2 462: # Display one part, in event of network error.
463: # If this is a single part, we can at least show the correct
1.101 bowersj2 464: # status, but if it's multipart, we're lost, since we can't
465: # retreive the metadata to count the parts
1.66 bowersj2 466: if ($curRes->{RESOURCE_ERROR}) {
467: @parts = ("0");
468: }
469:
1.101 bowersj2 470: # Step Two: Print the actual data.
471:
472: # For each part we intend to display...
1.51 bowersj2 473: foreach my $part (@parts) {
1.59 bowersj2 474:
1.68 bowersj2 475: my $nonLinkedText = ""; # unlinked stuff after title
1.51 bowersj2 476:
477: my $stack = $mapIterator->getStack();
478: my $src = getLinkForResource($stack);
479:
1.101 bowersj2 480: # Pass the correct symb on the querystring, so the
481: # remote will figure out where we are if we click a link
1.51 bowersj2 482: my $srcHasQuestion = $src =~ /\?/;
483: my $link = $src.
484: ($srcHasQuestion?'&':'?') .
485: 'symb='.&Apache::lonnet::escape($curRes->symb()).
486: '"';
1.101 bowersj2 487:
1.106 bowersj2 488: my $title = $curRes->compTitle();
1.122 ! www 489: if ($src=~/^\/uploaded\//) {
! 490: $nonLinkedText=$title;
! 491: $title='';
! 492: }
1.51 bowersj2 493: my $partLabel = "";
1.52 bowersj2 494: my $newBranchText = "";
495:
496: # If this is a new branch, label it so
497: if ($isNewBranch) {
1.59 bowersj2 498: $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
1.52 bowersj2 499: $isNewBranch = 0;
500: }
1.51 bowersj2 501:
502: # links to open and close the folders
503: my $linkopen = "<a href=\"$link\">";
504: my $linkclose = "</a>";
505:
1.61 bowersj2 506: my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";
1.51 bowersj2 507: if ($curRes->is_problem()) {
1.66 bowersj2 508: if ($part eq "0" || $condensed) {
509: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />';
510: } else {
511: $icon = $indentString;
512: }
1.51 bowersj2 513: }
514:
515: # Display the correct icon, link to open or shut map
516: if ($curRes->is_map()) {
517: my $mapId = $curRes->map_pc();
1.82 bowersj2 518: my $nowOpen = (!defined($filterHash{$mapId}));
519: if ($condition) {$nowOpen = !$nowOpen;}
1.51 bowersj2 520: $icon = $nowOpen ?
1.77 bowersj2 521: "navmap.folder.closed.gif" : "navmap.folder.open.gif";
1.66 bowersj2 522: $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";
1.52 bowersj2 523: $linkopen = "<a href=\"/adm/navmaps?filter=";
1.66 bowersj2 524: $linkopen .= ($nowOpen xor $condition) ?
1.51 bowersj2 525: addToFilter(\%filterHash, $mapId) :
526: removeFromFilter(\%filterHash, $mapId);
1.118 bowersj2 527: $linkopen .= "&condition=$condition&$queryAdd" .
528: "&hereType=$hereType&here=" .
529: Apache::lonnet::escape($here) . "&jumpType=$SYMB&" .
530: "jump=" . Apache::lonnet::escape($curRes->symb()) ."\">";
1.51 bowersj2 531: $linkclose = "</a>";
1.68 bowersj2 532:
1.51 bowersj2 533: }
534:
535: my $colorizer = "";
1.86 bowersj2 536: my $color;
1.51 bowersj2 537: if ($curRes->is_problem()) {
1.115 bowersj2 538: $color = $colormap{$curRes->status};
1.74 bowersj2 539:
1.115 bowersj2 540: if (dueInLessThen24Hours($curRes, $part) ||
541: lastTry($curRes, $part)) {
1.79 bowersj2 542: $color = $hurryUpColor;
543: }
1.115 bowersj2 544:
1.51 bowersj2 545: if ($color ne "") {
546: $colorizer = "bgcolor=\"$color\"";
547: }
548: }
549:
1.68 bowersj2 550: if ($curRes->randomout()) {
551: $nonLinkedText .= ' <i>(hidden)</i> ';
552: }
553:
1.88 bowersj2 554: $rowNum++;
555: my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
556:
1.91 bowersj2 557: # FIRST COL: The resource indentation, branch icon, name, and anchor
1.116 bowersj2 558: $r->print(" <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\">\n");
1.51 bowersj2 559:
1.101 bowersj2 560: # Print the anchor if necessary
1.118 bowersj2 561: if ($counter == $currentJumpIndex - $currentJumpDelta ) {
562: $r->print('<a name="curloc" />');
563: $displayedJumpMarker = 1;
1.91 bowersj2 564: }
565:
1.51 bowersj2 566: # print indentation
1.116 bowersj2 567: for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {
1.51 bowersj2 568: $r->print($indentString);
569: }
570:
1.61 bowersj2 571: $r->print(" ${newBranchText}${linkopen}$icon${linkclose}\n");
1.51 bowersj2 572:
1.74 bowersj2 573: my $curMarkerBegin = "";
574: my $curMarkerEnd = "";
575:
576: # Is this the current resource?
1.118 bowersj2 577: if (!$displayedHereMarker &&
578: (($hereType == $SYMB && $curRes->symb eq $here) ||
579: ($hereType == $URL && $curRes->src eq $here))) {
580: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1.74 bowersj2 581: $curMarkerEnd = '<font color="red" size="+2"> <</font>';
1.78 bowersj2 582: $displayedHereMarker = 1;
1.74 bowersj2 583: }
584:
1.69 bowersj2 585: if ($curRes->is_problem() && $part ne "0" && !$condensed) {
1.66 bowersj2 586: $partLabel = " (Part $part)";
587: $title = "";
588: }
1.83 bowersj2 589: if ($multipart && $condensed) {
1.68 bowersj2 590: $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';
1.66 bowersj2 591: }
1.59 bowersj2 592:
1.74 bowersj2 593: $r->print(" $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
1.66 bowersj2 594:
1.118 bowersj2 595: #if ($curRes->{RESOURCE_ERROR}) {
596: # $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
597: # '<font size="-1">Host down</font>'));
598: # }
1.66 bowersj2 599:
1.113 bowersj2 600: $r->print("</td>\n");
601:
1.101 bowersj2 602: # SECOND COL: Is there text, feedback, errors??
1.66 bowersj2 603: my $discussionHTML = ""; my $feedbackHTML = "";
604:
605: if ($curRes->hasDiscussion()) {
606: $discussionHTML = $linkopen .
607: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
608: $linkclose;
609: }
610:
611: if ($curRes->getFeedback()) {
612: my $feedback = $curRes->getFeedback();
613: foreach (split(/\,/, $feedback)) {
614: if ($_) {
615: $feedbackHTML .= ' <a href="/adm/email?display='
616: . &Apache::lonnet::escape($_) . '">'
617: . '<img src="/adm/lonMisc/feedback.gif" '
618: . 'border="0" /></a>';
619: }
620: }
621: }
622:
1.84 bowersj2 623: $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML </td>");
1.66 bowersj2 624:
625: # Is this the first displayed part of a multi-part problem
626: # that has not been condensed, so we should suppress these two
1.101 bowersj2 627: # columns so we don't display useless status info about part
628: # "0"?
1.66 bowersj2 629: my $firstDisplayed = !$condensed && $multipart && $part eq "0";
630:
1.69 bowersj2 631: # THIRD COL: Problem status icon
1.66 bowersj2 632: if ($curRes->is_problem() &&
633: !$firstDisplayed) {
634: my $icon = $statusIconMap{$curRes->status($part)};
1.69 bowersj2 635: my $alt = $iconAltTags{$icon};
1.66 bowersj2 636: if ($icon) {
1.84 bowersj2 637: $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");
1.66 bowersj2 638: } else {
1.84 bowersj2 639: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 640: }
641: } else { # not problem, no icon
1.84 bowersj2 642: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 643: }
644:
1.69 bowersj2 645: # FOURTH COL: Text description
1.86 bowersj2 646: $r->print("<td align=\"right\" valign=\"center\">\n");
1.51 bowersj2 647:
1.61 bowersj2 648: if ($curRes->kind() eq "res" &&
649: $curRes->is_problem() &&
1.66 bowersj2 650: !$firstDisplayed) {
1.86 bowersj2 651: $r->print ("<font color=\"$color\"><b>") if ($color);
1.53 bowersj2 652: $r->print (getDescription($curRes, $part));
1.86 bowersj2 653: $r->print ("</b></font>") if ($color);
1.51 bowersj2 654: }
1.68 bowersj2 655: if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {
656: $r->print('(randomly select ' . $curRes->randompick() .')');
657: }
1.59 bowersj2 658:
1.84 bowersj2 659: $r->print(" </td></tr>\n");
1.113 bowersj2 660:
661: if (!($counter % 20)) { $r->rflush(); }
662: if ($counter == 2) { $r->rflush(); }
1.51 bowersj2 663: }
664: }
665: $curRes = $mapIterator->next();
666: }
667:
1.118 bowersj2 668: $r->print("</table>");
669:
670: # Print out the part that jumps to #curloc if it exists
671: if ($displayedJumpMarker) {
672: $r->print('<script>location += "#curloc";</script>');
673: }
674:
675: $r->print("</body></html>");
1.51 bowersj2 676:
1.59 bowersj2 677: $navmap->untieHashes();
678:
1.51 bowersj2 679: return OK;
680: }
681:
682: # Convenience functions: Returns a string that adds or subtracts
683: # the second argument from the first hash, appropriate for the
684: # query string that determines which folders to recurse on
685: sub addToFilter {
686: my $hashIn = shift;
687: my $addition = shift;
688: my %hash = %$hashIn;
689: $hash{$addition} = 1;
690:
691: return join (",", keys(%hash));
692: }
693:
694: sub removeFromFilter {
695: my $hashIn = shift;
696: my $subtraction = shift;
697: my %hash = %$hashIn;
698:
699: delete $hash{$subtraction};
700: return join(",", keys(%hash));
701: }
702:
703: # Convenience function: Given a stack returned from getStack on the iterator,
704: # return the correct src() value.
705: # Later, this should add an anchor when we start putting anchors in pages.
706: sub getLinkForResource {
707: my $stack = shift;
708: my $res;
709:
710: # Check to see if there are any pages in the stack
711: foreach $res (@$stack) {
712: if (defined($res) && $res->is_page()) {
713: return $res->src();
714: }
715: }
716:
717: # Failing that, return the src of the last resource that is defined
718: # (when we first recurse on a map, it puts an undefined resource
719: # on the bottom because $self->{HERE} isn't defined yet, and we
720: # want the src for the map anyhow)
721: foreach (@$stack) {
722: if (defined($_)) { $res = $_; }
723: }
724:
725: return $res->src();
726: }
727:
1.53 bowersj2 728: # Convenience function: This seperates the logic of how to create
729: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
730: # etc.) into a seperate function. It takes a resource object as the
731: # first parameter, and the part number of the resource as the second.
732: # It's basically a big switch statement on the status of the resource.
733:
734: sub getDescription {
735: my $res = shift;
736: my $part = shift;
1.69 bowersj2 737: my $status = $res->status($part);
1.53 bowersj2 738:
739: if ($status == $res->NETWORK_FAILURE) { return ""; }
740: if ($status == $res->NOTHING_SET) {
741: return "Not currently assigned.";
742: }
743: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 744: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 745: }
746: if ($status == $res->OPEN) {
1.79 bowersj2 747: if ($res->duedate($part)) {
1.73 bowersj2 748: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 749: } else {
750: return "Open, no due date";
751: }
1.53 bowersj2 752: }
1.54 bowersj2 753: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 754: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 755: }
756: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 757: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 758: }
759: if ($status == $res->ANSWER_OPEN) {
760: return "Answer available";
761: }
1.59 bowersj2 762: if ($status == $res->EXCUSED) {
1.66 bowersj2 763: return "Excused by instructor";
1.59 bowersj2 764: }
1.69 bowersj2 765: if ($status == $res->ATTEMPTED) {
766: return "Not yet graded.";
767: }
1.59 bowersj2 768: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 769: my $tries = $res->tries($part);
770: my $maxtries = $res->maxtries($part);
771: my $triesString = "";
772: if ($tries && $maxtries) {
773: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
774: if ($maxtries > 1 && $maxtries - $tries == 1) {
775: $triesString = "<b>$triesString</b>";
776: }
777: }
1.66 bowersj2 778: if ($res->duedate()) {
1.73 bowersj2 779: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 780: " $triesString";
781: } else {
782: return "No due date $triesString";
783: }
1.59 bowersj2 784: }
1.53 bowersj2 785: }
786:
1.115 bowersj2 787: # Convenience function, so others can use it: Is the problem due in less then
788: # 24 hours, and still can be done?
789:
790: sub dueInLessThen24Hours {
791: my $res = shift;
792: my $part = shift;
793: my $status = $res->status($part);
794:
795: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
796: $status == $res->TRIES_LEFT()) &&
797: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
798: $res->duedate() > time();
799: }
800:
801: # Convenience function, so others can use it: Is there only one try remaining for the
802: # part, with more then one try to begin with, not due yet and still can be done?
803: sub lastTry {
804: my $res = shift;
805: my $part = shift;
806:
807: my $tries = $res->tries($part);
808: my $maxtries = $res->maxtries($part);
809: return $tries && $maxtries && $maxtries > 1 &&
810: $maxtries - $tries == 1 && $res->duedate() &&
811: $res->duedate() > time();
812: }
813:
1.101 bowersj2 814: # This puts a human-readable name on the ENV variable.
1.68 bowersj2 815: sub advancedUser {
816: return $ENV{'user.adv'};
817: }
818:
1.73 bowersj2 819:
820: # timeToHumanString takes a time number and converts it to a
821: # human-readable representation, meant to be used in the following
822: # manner:
823: # print "Due $timestring"
824: # print "Open $timestring"
825: # print "Answer available $timestring"
826: # Very, very, very, VERY English-only... goodness help a localizer on
827: # this func...
1.53 bowersj2 828: sub timeToHumanString {
1.58 albertel 829: my ($time) = @_;
830: # zero, '0' and blank are bad times
1.73 bowersj2 831: if (!$time) {
832: return 'never';
833: }
834:
835: my $now = time();
836:
837: my @time = localtime($time);
838: my @now = localtime($now);
839:
840: # Positive = future
841: my $delta = $time - $now;
842:
843: my $minute = 60;
844: my $hour = 60 * $minute;
845: my $day = 24 * $hour;
846: my $week = 7 * $day;
847: my $inPast = 0;
848:
849: # Logic in comments:
850: # Is it now? (extremely unlikely)
851: if ( $delta == 0 ) {
852: return "this instant";
853: }
854:
855: if ($delta < 0) {
856: $inPast = 1;
857: $delta = -$delta;
858: }
859:
860: if ( $delta > 0 ) {
1.101 bowersj2 861:
1.73 bowersj2 862: my $tense = $inPast ? " ago" : "";
863: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 864:
865: # Less then a minute
1.73 bowersj2 866: if ( $delta < $minute ) {
867: if ($delta == 1) { return "${prefix}1 second$tense"; }
868: return "$prefix$delta seconds$tense";
869: }
870:
1.101 bowersj2 871: # Less then an hour
1.73 bowersj2 872: if ( $delta < $hour ) {
873: # If so, use minutes
874: my $minutes = floor($delta / 60);
875: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
876: return "$prefix$minutes minutes$tense";
877: }
878:
879: # Is it less then 24 hours away? If so,
880: # display hours + minutes
881: if ( $delta < $hour * 24) {
882: my $hours = floor($delta / $hour);
883: my $minutes = floor(($delta % $hour) / $minute);
884: my $hourString = "$hours hours";
885: my $minuteString = ", $minutes minutes";
886: if ($hours == 1) {
887: $hourString = "1 hour";
888: }
889: if ($minutes == 1) {
890: $minuteString = ", 1 minute";
891: }
892: if ($minutes == 0) {
893: $minuteString = "";
894: }
895: return "$prefix$hourString$minuteString$tense";
896: }
897:
898: # Less then 5 days away, display day of the week and
899: # HH:MM
900: if ( $delta < $day * 5 ) {
1.85 bowersj2 901: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 902: $timeStr =~ s/12:00 am/midnight/;
903: $timeStr =~ s/12:00 pm/noon/;
904: return ($inPast ? "last " : "next ") .
905: $timeStr;
906: }
907:
908: # Is it this year?
909: if ( $time[5] == $now[5]) {
910: # Return on Month Day, HH:MM meridian
911: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
912: $timeStr =~ s/12:00 am/midnight/;
913: $timeStr =~ s/12:00 pm/noon/;
914: return $timeStr;
915: }
916:
917: # Not this year, so show the year
918: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
919: $timeStr =~ s/12:00 am/midnight/;
920: $timeStr =~ s/12:00 pm/noon/;
921: return $timeStr;
1.58 albertel 922: }
1.53 bowersj2 923: }
924:
1.51 bowersj2 925: 1;
926:
927: package Apache::lonnavmaps::navmap;
928:
929: =pod
930:
931: 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.
932:
933: =head1 navmap object: Encapsulating the compiled nav map
934:
935: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
936:
937: 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.
938:
939: You must obtain resource objects through the navmap object.
940:
941: =head2 Methods
942:
943: =over 4
944:
1.70 bowersj2 945: =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 946:
947: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
948:
949: =cut
950:
951: use strict;
952: use GDBM_File;
953:
954: sub new {
955: # magic invocation to create a class instance
956: my $proto = shift;
957: my $class = ref($proto) || $proto;
958: my $self = {};
959:
960: $self->{NAV_HASH_FILE} = shift;
961: $self->{PARM_HASH_FILE} = shift;
962: $self->{GENERATE_COURSE_USER_OPT} = shift;
1.55 bowersj2 963: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1.51 bowersj2 964:
1.101 bowersj2 965: # Resource cache stores navmap resources as we reference them. We generate
1.51 bowersj2 966: # them on-demand so we don't pay for creating resources unless we use them.
967: $self->{RESOURCE_CACHE} = {};
968:
969: # Network failure flag, if we accessed the course or user opt and
970: # failed
971: $self->{NETWORK_FAILURE} = 0;
972:
973: # tie the nav hash
974: my %navmaphash;
975: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
976: &GDBM_READER(), 0640))) {
977: return undef;
978: }
979:
980: my %parmhash;
981: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
982: &GDBM_READER(), 0640)))
983: {
1.66 bowersj2 984: untie $self->{PARM_HASH};
1.51 bowersj2 985: return undef;
986: }
1.115 bowersj2 987:
988: # Now copy the hashes for speed (?)
989: my %realnav; my %realparm;
990: foreach (%navmaphash) { $realnav{$_} = $navmaphash{$_}; }
991: foreach (%parmhash) { $realparm{$_} = $navmaphash{$_}; }
992: $self->{NAV_HASH} = \%realnav;
993: $self->{PARM_HASH} = \%realparm;
1.51 bowersj2 994:
1.92 bowersj2 995: bless($self);
1.115 bowersj2 996: $self->untieHashes();
1.92 bowersj2 997:
998: return $self;
999: }
1000:
1001: sub init {
1.93 bowersj2 1002: my $self = shift;
1.92 bowersj2 1003:
1.51 bowersj2 1004: # If the course opt hash and the user opt hash should be generated,
1005: # generate them
1006: if ($self->{GENERATE_COURSE_USER_OPT}) {
1007: my $uname=$ENV{'user.name'};
1008: my $udom=$ENV{'user.domain'};
1009: my $uhome=$ENV{'user.home'};
1010: my $cid=$ENV{'request.course.id'};
1011: my $chome=$ENV{'course.'.$cid.'.home'};
1012: my ($cdom,$cnum)=split(/\_/,$cid);
1013:
1014: my $userprefix=$uname.'_'.$udom.'_';
1015:
1.99 bowersj2 1016: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1.51 bowersj2 1017: unless ($uhome eq 'no_host') {
1018: # ------------------------------------------------- Get coursedata (if present)
1019: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1020: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1021: ':resourcedata',$chome);
1022: if ($reply!~/^error\:/) {
1023: $courserdatas{$cid}=$reply;
1024: $courserdatas{$cid.'.last_cache'}=time;
1025: }
1026: # check to see if network failed
1027: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1028: {
1029: $self->{NETWORK_FAILURE} = 1;
1030: }
1031: }
1032: foreach (split(/\&/,$courserdatas{$cid})) {
1033: my ($name,$value)=split(/\=/,$_);
1034: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1035: &Apache::lonnet::unescape($value);
1036: }
1037: # --------------------------------------------------- Get userdata (if present)
1038: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1039: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1040: if ($reply!~/^error\:/) {
1041: $userrdatas{$uname.'___'.$udom}=$reply;
1042: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1043: }
1044: # check to see if network failed
1045: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1046: {
1047: $self->{NETWORK_FAILURE} = 1;
1048: }
1049: }
1050: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1051: my ($name,$value)=split(/\=/,$_);
1052: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1053: &Apache::lonnet::unescape($value);
1054: }
1.55 bowersj2 1055: $self->{COURSE_OPT} = \%courseopt;
1056: $self->{USER_OPT} = \%useropt;
1.51 bowersj2 1057: }
1058: }
1059:
1.55 bowersj2 1060: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1061: my $cid=$ENV{'request.course.id'};
1062: my ($cdom,$cnum)=split(/\_/,$cid);
1063:
1064: my %emailstatus = &Apache::lonnet::dump('email_status');
1.56 bowersj2 1065: my $logoutTime = $emailstatus{'logout'};
1066: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1.55 bowersj2 1067: $self->{LAST_CHECK} = ($courseLeaveTime > $logoutTime ?
1068: $courseLeaveTime : $logoutTime);
1.56 bowersj2 1069: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1.55 bowersj2 1070: $cdom, $cnum);
1071: my %feedback=();
1072: my %error=();
1073: my $keys = &Apache::lonnet::reply('keys:'.
1074: $ENV{'user.domain'}.':'.
1075: $ENV{'user.name'}.':nohist_email',
1076: $ENV{'user.home'});
1077:
1078: foreach my $msgid (split(/\&/, $keys)) {
1079: $msgid=&Apache::lonnet::unescape($msgid);
1080: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1081: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1082: my ($what,$url)=($1,$2);
1083: my %status=
1084: &Apache::lonnet::get('email_status',[$msgid]);
1085: if ($status{$msgid}=~/^error\:/) {
1086: $status{$msgid}='';
1087: }
1088:
1089: if (($status{$msgid} eq 'new') ||
1090: (!$status{$msgid})) {
1091: if ($what eq 'Error') {
1092: $error{$url}.=','.$msgid;
1093: } else {
1094: $feedback{$url}.=','.$msgid;
1095: }
1096: }
1097: }
1098: }
1099:
1100: $self->{FEEDBACK} = \%feedback;
1101: $self->{ERROR_MSG} = \%error; # what is this? JB
1102: $self->{DISCUSSION_TIME} = \%discussiontime;
1103: $self->{EMAIL_STATUS} = \%emailstatus;
1104:
1105: }
1.84 bowersj2 1106:
1107: $self->{PARM_CACHE} = {};
1.55 bowersj2 1108: }
1.51 bowersj2 1109:
1.115 bowersj2 1110: # Internal function: Takes a key to look up in the nav hash and implements internal
1111: # memory caching of that key.
1112: sub navhash {
1113: my $self = shift; my $key = shift;
1114: return $self->{NAV_HASH}->{$key};
1115: }
1116:
1.55 bowersj2 1117: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1118: sub courseMapDefined {
1119: my $self = shift;
1120: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1121:
1.115 bowersj2 1122: my $firstres = $self->navhash("map_start_$uri");
1123: my $lastres = $self->navhash("map_finish_$uri");
1.55 bowersj2 1124: return $firstres && $lastres;
1.51 bowersj2 1125: }
1126:
1127: sub getIterator {
1128: my $self = shift;
1.98 bowersj2 1129: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1.101 bowersj2 1130: shift, undef, shift);
1.51 bowersj2 1131: return $iterator;
1132: }
1133:
1134: # unties the hash when done
1135: sub untieHashes {
1136: my $self = shift;
1.60 bowersj2 1137: untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
1138: untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
1.51 bowersj2 1139: $self->{HASH_TIED} = 0;
1140: }
1141:
1142: # when the object is destroyed, be sure to untie all the hashes we tied.
1143: sub DESTROY {
1144: my $self = shift;
1145: $self->untieHashes();
1146: }
1147:
1.59 bowersj2 1148: # Private function: Does the given resource (as a symb string) have
1149: # current discussion? Returns 0 if chat/mail data not extracted.
1150: sub hasDiscussion {
1151: my $self = shift;
1152: my $symb = shift;
1153: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1154:
1155: return $self->{DISCUSSION_TIME}->{$symb} >
1.66 bowersj2 1156: $self->{LAST_CHECK};
1.59 bowersj2 1157: }
1158:
1159: # Private function: Does the given resource (as a symb string) have
1160: # current feedback? Returns the string in the feedback hash, which
1161: # will be false if it does not exist.
1162: sub getFeedback {
1163: my $self = shift;
1164: my $symb = shift;
1165:
1166: if (!defined($self->{FEEDBACK})) { return ""; }
1167:
1168: return $self->{FEEDBACK}->{$symb};
1169: }
1170:
1.51 bowersj2 1171: =pod
1172:
1173: =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.
1174:
1175: =cut
1176:
1177: # The strategy here is to cache the resource objects, and only construct them
1178: # as we use them. The real point is to prevent reading any more from the tied
1179: # hash then we have to, which should hopefully alleviate speed problems.
1180: # Caching is just an incidental detail I throw in because it makes sense.
1181:
1182: sub getById {
1183: my $self = shift;
1184: my $id = shift;
1185:
1186: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1187: {
1188: return $self->{RESOURCE_CACHE}->{$id};
1189: }
1190:
1191: # resource handles inserting itself into cache.
1192: return Apache::lonnavmaps::resource->new($self, $id);
1193: }
1194:
1195: =pod
1196:
1197: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
1198:
1199: =cut
1200:
1201: sub firstResource {
1202: my $self = shift;
1.115 bowersj2 1203: my $firstResource = $self->navhash('map_start_' .
1204: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1.51 bowersj2 1205: return $self->getById($firstResource);
1206: }
1207:
1208: =pod
1209:
1210: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
1211:
1212: =cut
1213:
1214: sub finishResource {
1215: my $self = shift;
1.115 bowersj2 1216: my $firstResource = $self->navhash('map_finish_' .
1217: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1.51 bowersj2 1218: return $self->getById($firstResource);
1219: }
1220:
1.101 bowersj2 1221: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1222: # the actual lookup; parmval caches the results.
1.51 bowersj2 1223: sub parmval {
1224: my $self = shift;
1225: my ($what,$symb)=@_;
1.84 bowersj2 1226: my $hashkey = $what."|||".$symb;
1227:
1228: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1229: return $self->{PARM_CACHE}->{$hashkey};
1230: }
1231:
1232: my $result = $self->parmval_real($what, $symb);
1233: $self->{PARM_CACHE}->{$hashkey} = $result;
1234: return $result;
1235: }
1236:
1237: sub parmval_real {
1238: my $self = shift;
1239: my ($what,$symb) = @_;
1240:
1.51 bowersj2 1241: my $cid=$ENV{'request.course.id'};
1242: my $csec=$ENV{'request.course.sec'};
1243: my $uname=$ENV{'user.name'};
1244: my $udom=$ENV{'user.domain'};
1245:
1246: unless ($symb) { return ''; }
1247: my $result='';
1248:
1249: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1250:
1251: # ----------------------------------------------------- Cascading lookup scheme
1252: my $rwhat=$what;
1253: $what=~s/^parameter\_//;
1254: $what=~s/\_/\./;
1255:
1256: my $symbparm=$symb.'.'.$what;
1257: my $mapparm=$mapname.'___(all).'.$what;
1258: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1259:
1260: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1261: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1262: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1263:
1264: my $courselevel= $usercourseprefix.'.'.$what;
1265: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1266: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1267:
1268: my $useropt = $self->{USER_OPT};
1269: my $courseopt = $self->{COURSE_OPT};
1270: my $parmhash = $self->{PARM_HASH};
1271:
1272: # ---------------------------------------------------------- first, check user
1273: if ($uname and defined($useropt)) {
1.57 albertel 1274: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1275: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1276: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1.51 bowersj2 1277: }
1278:
1279: # ------------------------------------------------------- second, check course
1280: if ($csec and defined($courseopt)) {
1.57 albertel 1281: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1282: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1283: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1.51 bowersj2 1284: }
1285:
1286: if (defined($courseopt)) {
1.57 albertel 1287: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1288: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1289: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1.51 bowersj2 1290: }
1291:
1292: # ----------------------------------------------------- third, check map parms
1293:
1294: my $thisparm=$$parmhash{$symbparm};
1.57 albertel 1295: if (defined($thisparm)) { return $thisparm; }
1.51 bowersj2 1296:
1297: # ----------------------------------------------------- fourth , check default
1298:
1299: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1.57 albertel 1300: if (defined($default)) { return $default}
1.51 bowersj2 1301:
1302: # --------------------------------------------------- fifth , cascade up parts
1303:
1304: my ($space,@qualifier)=split(/\./,$rwhat);
1305: my $qualifier=join('.',@qualifier);
1306: unless ($space eq '0') {
1307: my ($part,$id)=split(/\_/,$space);
1308: if ($id) {
1309: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1.57 albertel 1310: if (defined($partgeneral)) { return $partgeneral; }
1.51 bowersj2 1311: } else {
1312: my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
1.57 albertel 1313: if (defined($resourcegeneral)) { return $resourcegeneral; }
1.51 bowersj2 1314: }
1315: }
1316: return '';
1317: }
1318:
1319:
1320: 1;
1321:
1322: package Apache::lonnavmaps::iterator;
1323:
1324: =pod
1325:
1326: =back
1327:
1328: =head1 navmap Iterator
1329:
1330: 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.
1331:
1332: 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:
1333:
1334: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1335:
1336: To get the next thing from the iterator, call B<next>:
1337:
1338: C<my $nextThing = $resourceIterator-E<gt>next()>
1339:
1340: getIterator behaves as follows:
1341:
1342: =over 4
1343:
1.116 bowersj2 1344: =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 1345:
1.101 bowersj2 1346: 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 1347:
1348: 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:
1349:
1350: =over 4
1351:
1.70 bowersj2 1352: =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
1353:
1354: =item * END_MAP: The map is now done.
1355:
1356: =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
1357:
1358: =item * END_BRANCH: The branch is now done.
1.51 bowersj2 1359:
1360: =back
1361:
1.70 bowersj2 1362: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
1363:
1.116 bowersj2 1364: 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.
1365:
1.70 bowersj2 1366: =back
1.51 bowersj2 1367:
1368: =cut
1369:
1370: # Here are the tokens for the iterator:
1371:
1372: sub BEGIN_MAP { return 1; } # begining of a new map
1373: sub END_MAP { return 2; } # end of the map
1374: sub BEGIN_BRANCH { return 3; } # beginning of a branch
1375: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 1376: sub FORWARD { return 1; } # go forward
1377: sub BACKWARD { return 2; }
1.51 bowersj2 1378:
1.96 bowersj2 1379: sub min {
1380: (my $a, my $b) = @_;
1381: if ($a < $b) { return $a; } else { return $b; }
1382: }
1383:
1.107 bowersj2 1384: # In the CVS repository, documentation of this algorithm is included
1385: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
1386: # will reference the same location in the text as the part of the
1387: # algorithm is running through.
1388:
1.94 bowersj2 1389: sub new {
1390: # magic invocation to create a class instance
1391: my $proto = shift;
1392: my $class = ref($proto) || $proto;
1393: my $self = {};
1394:
1395: $self->{NAV_MAP} = shift;
1396: return undef unless ($self->{NAV_MAP});
1397:
1398: # Handle the parameters
1399: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1400: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1401:
1402: # If the given resources are just the ID of the resource, get the
1403: # objects
1404: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1405: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1406: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1407: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1408:
1409: $self->{FILTER} = shift;
1410:
1411: # A hash, used as a set, of resource already seen
1412: $self->{ALREADY_SEEN} = shift;
1413: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1414: $self->{CONDITION} = shift;
1415:
1.116 bowersj2 1416: # Do we want to automatically follow "redirection" maps?
1417: $self->{FORCE_TOP} = shift;
1418:
1.94 bowersj2 1419: # Now, we need to pre-process the map, by walking forward and backward
1420: # over the parts of the map we're going to look at.
1.96 bowersj2 1421:
1.97 bowersj2 1422: # The processing steps are exactly the same, except for a few small
1423: # changes, so I bundle those up in the following list of two elements:
1424: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
1425: # first_resource).
1426: # This prevents writing nearly-identical code twice.
1427: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
1428: 'FIRST_RESOURCE'],
1429: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
1430: 'FINISH_RESOURCE'] );
1431:
1.98 bowersj2 1432: my $maxDepth = 0; # tracks max depth
1433:
1.116 bowersj2 1434: # If there is only one resource in this map, and it's a map, we
1435: # want to remember that, so the user can ask for the first map
1436: # that isn't just a redirector.
1437: my $resource; my $resourceCount = 0;
1438:
1.107 bowersj2 1439: # **1**
1440:
1.97 bowersj2 1441: foreach my $pass (@iterations) {
1442: my $direction = $pass->[0];
1443: my $valName = $pass->[1];
1444: my $nextResourceMethod = $pass->[2];
1445: my $firstResourceName = $pass->[3];
1446:
1447: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
1448: $self->{FIRST_RESOURCE},
1449: $self->{FINISH_RESOURCE},
1450: {}, undef, 0, $direction);
1.96 bowersj2 1451:
1.97 bowersj2 1452: # prime the recursion
1453: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 bowersj2 1454: my $depth = 0;
1.97 bowersj2 1455: $iterator->next();
1456: my $curRes = $iterator->next();
1.98 bowersj2 1457: while ($depth > -1) {
1.97 bowersj2 1458: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
1459: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 1460:
1.97 bowersj2 1461: if (ref($curRes)) {
1.116 bowersj2 1462: # If there's only one resource, this will save it
1.117 bowersj2 1463: # we have to filter empty resources from consideration here,
1464: # or even "empty", redirecting maps have two (start & finish)
1465: # or three (start, finish, plus redirector)
1466: if($direction == FORWARD && $curRes->src()) {
1467: $resource = $curRes; $resourceCount++;
1468: }
1.97 bowersj2 1469: my $resultingVal = $curRes->{DATA}->{$valName};
1470: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 1471: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 1472:
1.116 bowersj2 1473: if ($nextCount == 1) { # **3**
1.97 bowersj2 1474: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
1475: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
1476: }
1477:
1.116 bowersj2 1478: if ($nextCount > 1) { # **4**
1.97 bowersj2 1479: foreach my $res (@{$nextResources}) {
1480: my $current = $res->{DATA}->{$valName} || 999999999;
1481: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
1482: }
1483: }
1484: }
1.96 bowersj2 1485:
1.107 bowersj2 1486: # Assign the final val (**2**)
1.97 bowersj2 1487: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 1488: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
1489: $curRes->{DATA}->{BOT_UP_VAL});
1490:
1491: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
1492: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1493: }
1.97 bowersj2 1494: $curRes = $iterator->next();
1.96 bowersj2 1495: }
1496: }
1.94 bowersj2 1497:
1.116 bowersj2 1498: # Check: Was this only one resource, a map?
1499: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
1500: my $firstResource = $resource->map_start();
1501: my $finishResource = $resource->map_finish();
1502: return
1503: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1504: $finishResource, $self->{FILTER},
1505: $self->{ALREADY_SEEN},
1506: $self->{CONDITION}, 0);
1507:
1508: }
1509:
1.98 bowersj2 1510: # Set up some bookkeeping information.
1511: $self->{CURRENT_DEPTH} = 0;
1512: $self->{MAX_DEPTH} = $maxDepth;
1513: $self->{STACK} = [];
1514: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1515:
1516: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
1517: push @{$self->{STACK}}, [];
1518: }
1519:
1.107 bowersj2 1520: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 1521: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
1522: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
1523:
1524: bless ($self);
1525:
1526: return $self;
1527: }
1528:
1529: sub next {
1530: my $self = shift;
1531:
1532: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1533: # grab the next from the recursive iterator
1534: my $next = $self->{RECURSIVE_ITERATOR}->next();
1535:
1536: # is it a begin or end map? If so, update the depth
1537: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
1538: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
1539:
1540: # Are we back at depth 0? If so, stop recursing
1541: if ($self->{RECURSIVE_DEPTH} == 0) {
1542: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1543: }
1544:
1545: return $next;
1546: }
1547:
1548: if (defined($self->{FORCE_NEXT})) {
1549: my $tmp = $self->{FORCE_NEXT};
1550: $self->{FORCE_NEXT} = undef;
1551: return $tmp;
1552: }
1553:
1554: # Have we not yet begun? If not, return BEGIN_MAP and
1555: # remember we've started.
1556: if ( !$self->{STARTED} ) {
1557: $self->{STARTED} = 1;
1558: return $self->BEGIN_MAP();
1559: }
1560:
1561: # Here's the guts of the iterator.
1562:
1563: # Find the next resource, if any.
1564: my $found = 0;
1565: my $i = $self->{MAX_DEPTH};
1566: my $newDepth;
1567: my $here;
1568: while ( $i >= 0 && !$found ) {
1.107 bowersj2 1569: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
1570: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 1571: $found = 1;
1572: $newDepth = $i;
1573: }
1574: $i--;
1575: }
1576:
1577: # If we still didn't find anything, we're done.
1578: if ( !$found ) {
1579: # We need to get back down to the correct branch depth
1580: if ( $self->{CURRENT_DEPTH} > 0 ) {
1581: $self->{CURRENT_DEPTH}--;
1582: return END_BRANCH();
1583: } else {
1584: return END_MAP();
1585: }
1586: }
1587:
1.104 bowersj2 1588: # If this is not a resource, it must be an END_BRANCH marker we want
1589: # to return directly.
1.107 bowersj2 1590: if (!ref($here)) { # **8**
1.104 bowersj2 1591: if ($here == END_BRANCH()) { # paranoia, in case of later extension
1592: $self->{CURRENT_DEPTH}--;
1593: return $here;
1594: }
1595: }
1596:
1597: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
1598: $self->{HERE} = $here;
1599:
1.98 bowersj2 1600: # Get to the right level
1601: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
1602: push @{$self->{STACK}->[$newDepth]}, $here;
1603: $self->{CURRENT_DEPTH}--;
1604: return END_BRANCH();
1605: }
1606: if ( $self->{CURRENT_DEPTH} < $newDepth) {
1607: push @{$self->{STACK}->[$newDepth]}, $here;
1608: $self->{CURRENT_DEPTH}++;
1609: return BEGIN_BRANCH();
1610: }
1611:
1612: # If we made it here, we have the next resource, and we're at the
1613: # right branch level. So let's examine the resource for where
1614: # we can get to from here.
1615:
1616: # So we need to look at all the resources we can get to from here,
1617: # categorize them if we haven't seen them, remember if we have a new
1618: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 1619: my $maxDepthAdded = -1;
1620:
1.98 bowersj2 1621: for (@$nextUnfiltered) {
1622: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 1623: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
1624: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 1625: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 1626: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 1627: }
1628: }
1.104 bowersj2 1629:
1630: # Is this the end of a branch? If so, all of the resources examined above
1631: # led to lower levels then the one we are currently at, so we push a END_BRANCH
1632: # marker onto the stack so we don't forget.
1633: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
1634: # BC branch and gets to C, it will see F as the only next resource, but it's
1635: # one level lower. Thus, this is the end of the branch, since there are no
1636: # more resources added to this level or above.
1.111 bowersj2 1637: # We don't do this if the examined resource is the finish resource,
1638: # because the condition given above is true, but the "END_MAP" will
1639: # take care of things and we should already be at depth 0.
1.104 bowersj2 1640: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 1641: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 1642: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
1643: }
1644:
1.98 bowersj2 1645: # That ends the main iterator logic. Now, do we want to recurse
1646: # down this map (if this resource is a map)?
1647: if ($self->{HERE}->is_map() &&
1648: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1649: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
1650: my $firstResource = $self->{HERE}->map_start();
1651: my $finishResource = $self->{HERE}->map_finish();
1652:
1653: $self->{RECURSIVE_ITERATOR} =
1654: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1655: $finishResource, $self->{FILTER},
1656: $self->{ALREADY_SEEN}, $self->{CONDITION});
1657: }
1658:
1.116 bowersj2 1659: # If this is a blank resource, don't actually return it.
1.117 bowersj2 1660: # Should you ever find you need it, make sure to add an option to the code
1661: # that you can use; other things depend on this behavior.
1.116 bowersj2 1662: if (!$self->{HERE}->src()) {
1663: return $self->next();
1664: }
1665:
1.98 bowersj2 1666: return $self->{HERE};
1667:
1668: }
1669:
1670: =pod
1671:
1672: 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).
1673:
1674: =cut
1675:
1676: sub getStack {
1677: my $self=shift;
1678:
1679: my @stack;
1680:
1681: $self->populateStack(\@stack);
1682:
1683: return \@stack;
1684: }
1685:
1686: # Private method: Calls the iterators recursively to populate the stack.
1687: sub populateStack {
1688: my $self=shift;
1689: my $stack = shift;
1690:
1691: push @$stack, $self->{HERE} if ($self->{HERE});
1692:
1693: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1694: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
1695: }
1.94 bowersj2 1696: }
1697:
1698: 1;
1699:
1700: package Apache::lonnavmaps::DFSiterator;
1701:
1.100 bowersj2 1702: # Not documented in the perldoc: This is a simple iterator that just walks
1703: # through the nav map and presents the resources in a depth-first search
1704: # fashion, ignorant of conditionals, randomized resources, etc. It presents
1705: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
1706: # useful for pre-processing of some kind, and is in fact used by the main
1707: # iterator that way, but that's about it.
1708: # One could imagine merging this into the init routine of the main iterator,
1709: # but this might as well be left seperate, since it is possible some other
1710: # use might be found for it. - Jeremy
1.94 bowersj2 1711:
1.117 bowersj2 1712: # Unlike the main iterator, this DOES return all resources, even blank ones.
1713: # The main iterator needs them to correctly preprocess the map.
1714:
1.94 bowersj2 1715: sub BEGIN_MAP { return 1; } # begining of a new map
1716: sub END_MAP { return 2; } # end of the map
1717: sub FORWARD { return 1; } # go forward
1718: sub BACKWARD { return 2; }
1719:
1.100 bowersj2 1720: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
1721: # filter hash ref (or undef), already seen hash or undef, condition
1722: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 1723: sub new {
1724: # magic invocation to create a class instance
1725: my $proto = shift;
1726: my $class = ref($proto) || $proto;
1727: my $self = {};
1728:
1729: $self->{NAV_MAP} = shift;
1730: return undef unless ($self->{NAV_MAP});
1731:
1732: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1733: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1734:
1735: # If the given resources are just the ID of the resource, get the
1736: # objects
1737: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1738: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1739: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1740: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1741:
1742: $self->{FILTER} = shift;
1743:
1744: # A hash, used as a set, of resource already seen
1745: $self->{ALREADY_SEEN} = shift;
1746: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 1747: $self->{CONDITION} = shift;
1.89 bowersj2 1748: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 1749:
1.100 bowersj2 1750: # Flag: Have we started yet?
1.51 bowersj2 1751: $self->{STARTED} = 0;
1752:
1753: # Should we continue calling the recursive iterator, if any?
1754: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1755: # The recursive iterator, if any
1756: $self->{RECURSIVE_ITERATOR} = undef;
1757: # Are we recursing on a map, or a branch?
1758: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
1759: # And the count of how deep it is, so that this iterator can keep track of
1760: # when to pick back up again.
1761: $self->{RECURSIVE_DEPTH} = 0;
1762:
1763: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 1764: $self->{STACK} = [];
1.51 bowersj2 1765:
1766: # Start with the first resource
1.89 bowersj2 1767: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 1768: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 1769: } else {
1.100 bowersj2 1770: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 1771: }
1.51 bowersj2 1772:
1773: bless($self);
1774: return $self;
1775: }
1776:
1777: sub next {
1778: my $self = shift;
1779:
1780: # Are we using a recursive iterator? If so, pull from that and
1781: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 1782: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 1783: # grab the next from the recursive iterator
1784: my $next = $self->{RECURSIVE_ITERATOR}->next();
1785:
1786: # is it a begin or end map? Update depth if so
1787: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
1788: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
1789:
1790: # Are we back at depth 0? If so, stop recursing.
1791: if ($self->{RECURSIVE_DEPTH} == 0) {
1792: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1793: }
1794:
1795: return $next;
1796: }
1797:
1798: # Is there a current resource to grab? If not, then return
1.100 bowersj2 1799: # END_MAP, which will end the iterator.
1800: if (scalar(@{$self->{STACK}}) == 0) {
1801: return $self->END_MAP();
1.51 bowersj2 1802: }
1803:
1804: # Have we not yet begun? If not, return BEGIN_MAP and
1805: # remember that we've started.
1806: if ( !$self->{STARTED} ) {
1807: $self->{STARTED} = 1;
1808: return $self->BEGIN_MAP;
1809: }
1810:
1811: # Get the next resource in the branch
1.100 bowersj2 1812: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 1813:
1.100 bowersj2 1814: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 1815: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
1816:
1817: # Get the next possible resources
1.90 bowersj2 1818: my $nextUnfiltered;
1.89 bowersj2 1819: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 1820: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 1821: } else {
1.90 bowersj2 1822: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 1823: }
1.51 bowersj2 1824: my $next = [];
1825:
1826: # filter the next possibilities to remove things we've
1.100 bowersj2 1827: # already seen.
1.51 bowersj2 1828: foreach (@$nextUnfiltered) {
1.52 bowersj2 1829: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1830: push @$next, $_;
1831: }
1.51 bowersj2 1832: }
1833:
1834: while (@$next) {
1.100 bowersj2 1835: # copy the next possibilities over to the stack
1836: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 1837: }
1838:
1839: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 1840: if ($self->{HERE}->is_map() &&
1.63 bowersj2 1841: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 1842: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
1843: my $firstResource = $self->{HERE}->map_start();
1844: my $finishResource = $self->{HERE}->map_finish();
1845:
1846: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 1847: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 1848: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 1849: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 1850: }
1851:
1852: return $self->{HERE};
1853: }
1854:
1.1 www 1855: 1;
1.2 www 1856:
1.51 bowersj2 1857: package Apache::lonnavmaps::resource;
1858:
1859: use Apache::lonnet;
1860:
1861: =pod
1862:
1863: =head1 Object: resource
1864:
1865: A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
1866:
1867: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
1868:
1869: You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.
1870:
1871: =head2 Public Members
1872:
1873: resource objects have a hash called DATA ($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.
1874:
1875: =head2 Methods
1876:
1877: =over 4
1878:
1.70 bowersj2 1879: =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.
1880:
1881: =back
1.51 bowersj2 1882:
1883: =cut
1884:
1885: sub new {
1886: # magic invocation to create a class instance
1887: my $proto = shift;
1888: my $class = ref($proto) || $proto;
1889: my $self = {};
1890:
1891: $self->{NAV_MAP} = shift;
1892: $self->{ID} = shift;
1893:
1894: # Store this new resource in the parent nav map's cache.
1895: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 1896: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 1897:
1898: # A hash that can be used by two-pass algorithms to store data
1899: # about this resource in. Not used by the resource object
1900: # directly.
1901: $self->{DATA} = {};
1902:
1903: bless($self);
1904:
1905: return $self;
1906: }
1907:
1.70 bowersj2 1908: # private function: simplify the NAV_HASH lookups we keep doing
1909: # pass the name, and to automatically append my ID, pass a true val on the
1910: # second param
1911: sub navHash {
1912: my $self = shift;
1913: my $param = shift;
1914: my $id = shift;
1.115 bowersj2 1915: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 1916: }
1917:
1.51 bowersj2 1918: =pod
1919:
1.70 bowersj2 1920: B<Metadata Retreival>
1921:
1.101 bowersj2 1922: 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 1923:
1924: =over 4
1925:
1.106 bowersj2 1926: =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").
1927:
1.70 bowersj2 1928: =item * B<ext>: Returns true if the resource is external.
1929:
1930: =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
1931:
1932: =item * B<kind>: Returns the kind of the resource from the compiled nav map.
1933:
1.101 bowersj2 1934: =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 1935:
1.70 bowersj2 1936: =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
1937:
1938: =item * B<src>: Returns the source for the resource.
1939:
1940: =item * B<symb>: Returns the symb for the resource.
1941:
1942: =item * B<title>: Returns the title of the resource.
1943:
1944: =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 1945:
1946: =back
1947:
1948: =cut
1949:
1950: # These info functions can be used directly, as they don't return
1951: # resource information.
1.85 bowersj2 1952: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 1953: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 1954: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 1955: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
1956: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 1957: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
1958: sub randompick {
1959: my $self = shift;
1960: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
1961: '.0.parameter_randompick'};
1962: }
1.51 bowersj2 1963: sub src {
1964: my $self=shift;
1965: return $self->navHash("src_", 1);
1966: }
1967: sub symb {
1968: my $self=shift;
1969: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
1970: my $symbSrc = &Apache::lonnet::declutter($self->src());
1971: return &Apache::lonnet::declutter(
1972: $self->navHash('map_id_'.$first))
1973: . '___' . $second . '___' . $symbSrc;
1974: }
1.70 bowersj2 1975: sub title { my $self=shift; return $self->navHash("title_", 1); }
1976: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 1977: sub compTitle {
1978: my $self = shift;
1979: my $title = $self->title();
1980: if (!$title) {
1981: $title = $self->src();
1982: $title = substr($title, rindex($title, '/') + 1);
1983: }
1984: return $title;
1985: }
1.70 bowersj2 1986: =pod
1987:
1988: B<Predicate Testing the Resource>
1989:
1990: These methods are shortcuts to deciding if a given resource has a given property.
1991:
1992: =over 4
1993:
1994: =item * B<is_map>: Returns true if the resource is a map type.
1995:
1996: =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.)
1997:
1998: =item * B<is_page>: Returns true if the resource is a page.
1999:
2000: =item * B<is_problem>: Returns true if the resource is a problem.
2001:
1.101 bowersj2 2002: =item * B<is_sequence>: Returns true if the resource is a sequence.
1.70 bowersj2 2003:
2004: =back
2005:
2006: =cut
2007:
2008:
2009: sub is_html {
1.51 bowersj2 2010: my $self=shift;
2011: my $src = $self->src();
1.70 bowersj2 2012: return ($src =~ /html$/);
1.51 bowersj2 2013: }
1.70 bowersj2 2014: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2015: sub is_page {
1.51 bowersj2 2016: my $self=shift;
2017: my $src = $self->src();
1.70 bowersj2 2018: return ($src =~ /page$/);
1.51 bowersj2 2019: }
1.70 bowersj2 2020: sub is_problem {
1.51 bowersj2 2021: my $self=shift;
2022: my $src = $self->src();
1.70 bowersj2 2023: return ($src =~ /problem$/);
1.51 bowersj2 2024: }
1.70 bowersj2 2025: sub is_sequence {
1.51 bowersj2 2026: my $self=shift;
2027: my $src = $self->src();
1.70 bowersj2 2028: return ($src =~ /sequence$/);
1.51 bowersj2 2029: }
2030:
1.101 bowersj2 2031: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 2032: sub parmval {
2033: my $self = shift;
2034: my $what = shift;
2035: my $part = shift || "0";
2036: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2037: }
2038:
1.70 bowersj2 2039: =pod
2040:
2041: B<Map Methods>
2042:
2043: These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
2044:
2045: =over 4
2046:
2047: =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
2048:
2049: =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.
2050:
2051: =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
2052:
2053: =item * B<map_type>: Returns a string with the type of the map in it.
2054:
2055: =back
1.51 bowersj2 2056:
1.70 bowersj2 2057: =cut
1.51 bowersj2 2058:
2059: sub map_finish {
2060: my $self = shift;
2061: my $src = $self->src();
2062: my $res = $self->navHash("map_finish_$src", 0);
2063: $res = $self->{NAV_MAP}->getById($res);
2064: return $res;
2065: }
1.70 bowersj2 2066: sub map_pc {
2067: my $self = shift;
2068: my $src = $self->src();
2069: return $self->navHash("map_pc_$src", 0);
2070: }
1.51 bowersj2 2071: sub map_start {
2072: my $self = shift;
2073: my $src = $self->src();
2074: my $res = $self->navHash("map_start_$src", 0);
2075: $res = $self->{NAV_MAP}->getById($res);
2076: return $res;
2077: }
2078: sub map_type {
2079: my $self = shift;
2080: my $pc = $self->map_pc();
2081: return $self->navHash("map_type_$pc", 0);
2082: }
2083:
2084:
2085:
2086: #####
2087: # Property queries
2088: #####
2089:
2090: # These functions will be responsible for returning the CORRECT
2091: # VALUE for the parameter, no matter what. So while they may look
2092: # like direct calls to parmval, they can be more then that.
2093: # So, for instance, the duedate function should use the "duedatetype"
2094: # information, rather then the resource object user.
2095:
2096: =pod
2097:
2098: =head2 Resource Parameters
2099:
1.70 bowersj2 2100: 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 2101:
2102: 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.)
2103:
2104: =over 4
2105:
2106: =item * B<acc>: Get the Client IP/Name Access Control information.
2107:
2108: =item * B<answerdate>: Get the answer-reveal date for the problem.
2109:
2110: =item * B<duedate>: Get the due date for the problem.
2111:
2112: =item * B<tries>: Get the number of tries the student has used on the problem.
2113:
2114: =item * B<maxtries>: Get the number of max tries allowed.
2115:
2116: =item * B<opendate>: Get the open date for the problem.
2117:
2118: =item * B<sig>: Get the significant figures setting.
2119:
2120: =item * B<tol>: Get the tolerance for the problem.
2121:
1.70 bowersj2 2122: =item * B<tries>: Get the number of tries the user has already used on the problem.
2123:
1.51 bowersj2 2124: =item * B<type>: Get the question type for the problem.
2125:
2126: =item * B<weight>: Get the weight for the problem.
2127:
2128: =back
2129:
2130: =cut
2131:
2132: sub acc {
2133: (my $self, my $part) = @_;
2134: return $self->parmval("acc", $part);
2135: }
2136: sub answerdate {
2137: (my $self, my $part) = @_;
2138: # Handle intervals
2139: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2140: return $self->duedate($part) +
2141: $self->parmval("answerdate", $part);
2142: }
2143: return $self->parmval("answerdate", $part);
1.106 bowersj2 2144: }
1.108 bowersj2 2145: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
1.51 bowersj2 2146: sub duedate {
2147: (my $self, my $part) = @_;
2148: return $self->parmval("duedate", $part);
2149: }
2150: sub maxtries {
2151: (my $self, my $part) = @_;
2152: return $self->parmval("maxtries", $part);
2153: }
2154: sub opendate {
2155: (my $self, my $part) = @_;
2156: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2157: return $self->duedate($part) -
2158: $self->parmval("opendate", $part);
2159: }
2160: return $self->parmval("opendate");
2161: }
2162: sub sig {
2163: (my $self, my $part) = @_;
2164: return $self->parmval("sig", $part);
2165: }
2166: sub tol {
2167: (my $self, my $part) = @_;
2168: return $self->parmval("tol", $part);
2169: }
1.108 bowersj2 2170: sub tries {
2171: my $self = shift;
2172: my $tries = $self->queryRestoreHash('tries', shift);
2173: if (!defined($tries)) { return '0';}
1.51 bowersj2 2174: return $tries;
2175: }
1.70 bowersj2 2176: sub type {
2177: (my $self, my $part) = @_;
2178: return $self->parmval("type", $part);
2179: }
1.109 bowersj2 2180: sub weight {
2181: my $self = shift; my $part = shift;
1.70 bowersj2 2182: return $self->parmval("weight", $part);
2183: }
1.51 bowersj2 2184:
2185: # Multiple things need this
2186: sub getReturnHash {
2187: my $self = shift;
2188:
2189: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 2190: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 2191: $self->{RETURN_HASH} = \%tmpHash;
2192: }
2193: }
2194:
2195: ######
2196: # Status queries
2197: ######
2198:
2199: # These methods query the status of problems.
2200:
2201: # If we need to count parts, this function determines the number of
2202: # parts from the metadata. When called, it returns a reference to a list
2203: # of strings corresponding to the parts. (Thus, using it in a scalar context
2204: # tells you how many parts you have in the problem:
2205: # $partcount = scalar($resource->countParts());
2206: # Don't use $self->{PARTS} directly because you don't know if it's been
2207: # computed yet.
2208:
2209: =pod
2210:
2211: =head2 Resource misc
2212:
2213: Misc. functions for the resource.
2214:
2215: =over 4
2216:
1.59 bowersj2 2217: =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.
2218:
2219: =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:
2220:
2221: for (split(/\,/, $res->getFeedback())) {
2222: my $link = &Apache::lonnet::escape($_);
2223: ...
2224:
2225: and use the link as appropriate.
2226:
2227: =cut
2228:
2229: sub hasDiscussion {
2230: my $self = shift;
2231: return $self->{NAV_MAP}->hasDiscussion($self->symb());
2232: }
2233:
2234: sub getFeedback {
2235: my $self = shift;
1.85 bowersj2 2236: return $self->{NAV_MAP}->getFeedback($self->src());
1.59 bowersj2 2237: }
2238:
2239: =pod
2240:
1.70 bowersj2 2241: =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 2242:
1.70 bowersj2 2243: =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 2244:
2245: =back
2246:
2247: =cut
2248:
2249: sub parts {
2250: my $self = shift;
2251:
1.67 bowersj2 2252: if ($self->ext) { return ['0']; }
2253:
1.51 bowersj2 2254: $self->extractParts();
2255: return $self->{PARTS};
2256: }
2257:
2258: sub countParts {
2259: my $self = shift;
2260:
2261: my $parts = $self->parts();
1.66 bowersj2 2262:
2263: if ($self->{RESOURCE_ERROR}) {
2264: return 0;
2265: }
2266:
2267: if (scalar(@{$parts}) < 2) { return 1;}
1.51 bowersj2 2268:
2269: return scalar(@{$parts}) - 1;
2270: }
2271:
2272: # Private function: Extracts the parts information and saves it
2273: sub extractParts {
2274: my $self = shift;
2275:
2276: return if ($self->{PARTS});
1.67 bowersj2 2277: return if ($self->ext);
1.51 bowersj2 2278:
2279: $self->{PARTS} = [];
2280:
1.82 bowersj2 2281: # Retrieve part count, if this is a problem
2282: if ($self->is_problem()) {
2283: my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys');
2284: if (!$metadata) {
2285: $self->{RESOURCE_ERROR} = 1;
2286: $self->{PARTS} = [];
2287: return;
2288: }
2289:
2290: foreach (split(/\,/,$metadata)) {
2291: if ($_ =~ /^parameter\_(.*)\_opendate$/) {
2292: push @{$self->{PARTS}}, $1;
2293: }
1.51 bowersj2 2294: }
1.82 bowersj2 2295:
2296:
2297: # Is this possible to do in one line? - Jeremy
2298: my @sortedParts = sort @{$self->{PARTS}};
2299: $self->{PARTS} = \@sortedParts;
1.51 bowersj2 2300: }
2301:
2302: return;
2303: }
2304:
2305: =pod
2306:
2307: =head2 Resource Status
2308:
1.101 bowersj2 2309: Problem resources have status information, reflecting their various dates and completion statuses.
1.51 bowersj2 2310:
2311: There are two aspects to the status: the date-related information and the completion information.
2312:
2313: Idiomatic usage of these two methods would probably look something like
2314:
2315: foreach ($resource->parts()) {
2316: my $dateStatus = $resource->getDateStatus($_);
2317: my $completionStatus = $resource->getCompletionStatus($_);
2318:
1.70 bowersj2 2319: or
2320:
2321: my $status = $resource->status($_);
2322:
1.51 bowersj2 2323: ... use it here ...
2324: }
2325:
1.101 bowersj2 2326: 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.
2327:
2328: The symbolic constants shown below can be accessed through the resource object: $res->OPEN.
2329:
1.51 bowersj2 2330: =over 4
2331:
1.70 bowersj2 2332: =item * B<getDateStatus>($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 2333:
2334: =back
2335:
2336: B<Date Codes>
2337:
2338: =over 4
2339:
2340: =item * B<OPEN_LATER>: The problem will be opened later.
2341:
2342: =item * B<OPEN>: Open and not yet due.
2343:
1.59 bowersj2 2344:
1.54 bowersj2 2345: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
2346:
2347: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51 bowersj2 2348:
2349: =item * B<ANSWER_OPEN>: The answer date is here.
2350:
2351: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
2352:
2353: =back
2354:
2355: =cut
2356:
2357: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 2358: sub OPEN_LATER { return 0; }
2359: sub OPEN { return 1; }
2360: sub PAST_DUE_NO_ANSWER { return 2; }
2361: sub PAST_DUE_ANSWER_LATER { return 3; }
2362: sub ANSWER_OPEN { return 4; }
2363: sub NOTHING_SET { return 5; }
2364: sub NETWORK_FAILURE { return 100; }
2365:
2366: # getDateStatus gets the date status for a given problem part.
2367: # Because answer date, due date, and open date are fully independent
2368: # (i.e., it is perfectly possible to *only* have an answer date),
2369: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
2370: # (past, future, none given). This function handles this with a decision
2371: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 2372:
2373: sub getDateStatus {
2374: my $self = shift;
2375: my $part = shift;
2376: $part = "0" if (!defined($part));
1.54 bowersj2 2377:
2378: # Always return network failure if there was one.
1.51 bowersj2 2379: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2380:
2381: my $now = time();
2382:
1.53 bowersj2 2383: my $open = $self->opendate($part);
2384: my $due = $self->duedate($part);
2385: my $answer = $self->answerdate($part);
2386:
2387: if (!$open && !$due && !$answer) {
2388: # no data on the problem at all
2389: # should this be the same as "open later"? think multipart.
2390: return $self->NOTHING_SET;
2391: }
1.59 bowersj2 2392: if (!$open || $now < $open) {return $self->OPEN_LATER}
2393: if (!$due || $now < $due) {return $self->OPEN}
2394: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
2395: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 2396: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 2397: }
2398:
2399: =pod
2400:
2401: B<>
2402:
2403: =over 4
2404:
2405: =item * B<getCompletionStatus>($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:
2406:
2407: =back
2408:
2409: B<Completion Codes>
2410:
2411: =over 4
2412:
2413: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
2414:
2415: =item * B<INCORRECT>: Attempted, but wrong by student.
2416:
2417: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
2418:
2419: =item * B<CORRECT>: Correct or correct by instructor.
2420:
2421: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
2422:
2423: =item * B<EXCUSED>: Excused. Not yet implemented.
2424:
2425: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
2426:
1.69 bowersj2 2427: =item * B<ATTEMPTED>: Attempted, and not yet graded.
2428:
1.51 bowersj2 2429: =back
2430:
2431: =cut
2432:
1.53 bowersj2 2433: sub NOT_ATTEMPTED { return 10; }
2434: sub INCORRECT { return 11; }
2435: sub INCORRECT_BY_OVERRIDE { return 12; }
2436: sub CORRECT { return 13; }
2437: sub CORRECT_BY_OVERRIDE { return 14; }
2438: sub EXCUSED { return 15; }
1.69 bowersj2 2439: sub ATTEMPTED { return 16; }
1.51 bowersj2 2440:
2441: sub getCompletionStatus {
2442: my $self = shift;
2443: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2444:
1.108 bowersj2 2445: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 2446:
2447: # Left as seperate if statements in case we ever do more with this
2448: if ($status eq 'correct_by_student') {return $self->CORRECT;}
2449: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
2450: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
2451: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
2452: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 2453: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 2454: return $self->NOT_ATTEMPTED;
1.108 bowersj2 2455: }
2456:
2457: sub queryRestoreHash {
2458: my $self = shift;
2459: my $hashentry = shift;
2460: my $part = shift;
2461: $part = "0" if (!defined($part));
2462: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2463:
2464: $self->getReturnHash();
2465:
2466: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 2467: }
2468:
2469: =pod
2470:
2471: B<Composite Status>
2472:
1.101 bowersj2 2473: Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):
1.51 bowersj2 2474:
2475: =over 4
2476:
1.70 bowersj2 2477: =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
1.51 bowersj2 2478:
1.70 bowersj2 2479: =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 2480:
1.70 bowersj2 2481: =item * B<CORRECT>: For any reason at all, the part is considered correct.
1.51 bowersj2 2482:
1.70 bowersj2 2483: =item * B<EXCUSED>: For any reason at all, the problem is excused.
1.51 bowersj2 2484:
1.70 bowersj2 2485: =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
1.54 bowersj2 2486:
1.70 bowersj2 2487: =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 2488:
1.70 bowersj2 2489: =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
1.51 bowersj2 2490:
1.70 bowersj2 2491: =item * B<OPEN_LATER>: The problem is not yet open.
1.51 bowersj2 2492:
1.70 bowersj2 2493: =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
1.51 bowersj2 2494:
1.70 bowersj2 2495: =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
1.51 bowersj2 2496:
1.70 bowersj2 2497: =item * B<OPEN>: The item is open and not yet tried.
1.51 bowersj2 2498:
1.70 bowersj2 2499: =item * B<ATTEMPTED>: The problem has been attempted.
1.69 bowersj2 2500:
1.51 bowersj2 2501: =back
2502:
2503: =cut
2504:
2505: sub TRIES_LEFT { return 10; }
2506:
2507: sub status {
2508: my $self = shift;
2509: my $part = shift;
2510: if (!defined($part)) { $part = "0"; }
2511: my $completionStatus = $self->getCompletionStatus($part);
2512: my $dateStatus = $self->getDateStatus($part);
2513:
2514: # What we have is a two-dimensional matrix with 4 entries on one
2515: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 2516: # plus network failure and "no date data at all".
1.51 bowersj2 2517:
1.53 bowersj2 2518: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 2519:
2520: # There are a few whole rows we can dispose of:
1.53 bowersj2 2521: if ($completionStatus == CORRECT ||
2522: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.69 bowersj2 2523: return CORRECT;
2524: }
2525:
2526: if ($completionStatus == ATTEMPTED) {
2527: return ATTEMPTED;
1.53 bowersj2 2528: }
2529:
2530: # If it's EXCUSED, then return that no matter what
2531: if ($completionStatus == EXCUSED) {
2532: return EXCUSED;
1.51 bowersj2 2533: }
2534:
1.53 bowersj2 2535: if ($dateStatus == NOTHING_SET) {
2536: return NOTHING_SET;
1.51 bowersj2 2537: }
2538:
1.69 bowersj2 2539: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
2540: # by 4 matrix (date statuses).
1.51 bowersj2 2541:
1.54 bowersj2 2542: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 2543: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 2544: return $dateStatus;
1.51 bowersj2 2545: }
2546:
1.53 bowersj2 2547: if ($dateStatus == ANSWER_OPEN) {
2548: return ANSWER_OPEN;
1.51 bowersj2 2549: }
2550:
2551: # Now: (incorrect, incorrect_override, not_attempted) x
2552: # (open_later), (open)
2553:
1.53 bowersj2 2554: if ($dateStatus == OPEN_LATER) {
2555: return OPEN_LATER;
1.51 bowersj2 2556: }
2557:
2558: # If it's WRONG...
1.53 bowersj2 2559: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 2560: # and there are TRIES LEFT:
1.79 bowersj2 2561: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 2562: return TRIES_LEFT;
1.51 bowersj2 2563: }
1.53 bowersj2 2564: return INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 2565: }
2566:
2567: # Otherwise, it's untried and open
1.53 bowersj2 2568: return OPEN;
1.51 bowersj2 2569: }
2570:
2571: =pod
2572:
2573: =head2 Resource/Nav Map Navigation
2574:
2575: =over 4
2576:
1.101 bowersj2 2577: =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 2578:
1.101 bowersj2 2579: =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 2580:
2581: =cut
2582:
2583: sub getNext {
2584: my $self = shift;
2585: my @branches;
2586: my $to = $self->to();
1.85 bowersj2 2587: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 2588: my $choice = $self->{NAV_MAP}->getById($branch);
2589: my $next = $choice->goesto();
2590: $next = $self->{NAV_MAP}->getById($next);
2591:
1.101 bowersj2 2592: # Don't remember it if the student doesn't have browse priviledges
2593: # future note: this may properly belong in the client of the resource
1.114 bowersj2 2594: my $browsePriv = $self->{BROWSE_PRIV};
2595: if (!defined($browsePriv)) {
2596: $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
2597: $self->{BROWSE_PRIV} = $browsePriv;
2598: }
1.102 bowersj2 2599: if (!($browsePriv ne '2' && $browsePriv ne 'F')) {
1.101 bowersj2 2600: push @branches, $next;
2601: }
1.85 bowersj2 2602: }
2603: return \@branches;
2604: }
2605:
2606: sub getPrevious {
2607: my $self = shift;
2608: my @branches;
2609: my $from = $self->from();
2610: foreach my $branch ( split /,/, $from) {
2611: my $choice = $self->{NAV_MAP}->getById($branch);
2612: my $prev = $choice->comesfrom();
2613: $prev = $self->{NAV_MAP}->getById($prev);
2614:
1.101 bowersj2 2615: # Don't remember it if the student doesn't have browse priviledges
2616: # future note: this may properly belong in the client of the resource
1.114 bowersj2 2617: my $browsePriv = $self->{BROWSE_PRIV};
2618: if (!defined($browsePriv)) {
2619: $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
2620: $self->{BROWSE_PRIV} = $browsePriv;
2621: }
1.103 bowersj2 2622: if (!($browsePriv ne '2' && $browsePriv ne 'F')) {
1.87 www 2623: push @branches, $prev;
1.85 bowersj2 2624: }
1.51 bowersj2 2625: }
2626: return \@branches;
2627: }
2628:
2629: =pod
1.2 www 2630:
1.51 bowersj2 2631: =back
1.2 www 2632:
1.51 bowersj2 2633: =cut
1.2 www 2634:
1.51 bowersj2 2635: 1;
1.2 www 2636:
1.51 bowersj2 2637: __END__
1.2 www 2638:
2639:
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