Annotation of loncom/interface/lonnavmaps.pm, revision 1.137
1.72 bowersj2 1:
1.2 www 2: # The LearningOnline Network with CAPA
3: # Navigate Maps Handler
1.1 www 4: #
1.137 ! bowersj2 5: # $Id: lonnavmaps.pm,v 1.136 2003/02/04 16:37:51 bowersj2 Exp $
1.20 albertel 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.2 www 29: # (Page Handler
1.1 www 30: #
1.2 www 31: # (TeX Content Handler
1.1 www 32: #
1.2 www 33: # 05/29/00,05/30 Gerd Kortemeyer)
34: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
35: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
1.1 www 36: #
1.17 www 37: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
1.21 www 38: # YEAR=2002
39: # 1/1 Gerd Kortemeyer
1.105 bowersj2 40: # Oct-Nov Jeremy Bowers
1.2 www 41:
1.1 www 42: package Apache::lonnavmaps;
43:
44: use strict;
1.2 www 45: use Apache::Constants qw(:common :http);
1.18 albertel 46: use Apache::loncommon();
1.73 bowersj2 47: use POSIX qw (floor strftime);
1.2 www 48:
1.130 www 49: my %navmaphash;
50: my %parmhash;
51:
1.133 bowersj2 52: # symbolic constants
53: sub SYMB { return 1; }
54: sub URL { return 2; }
55: sub NOTHING { return 3; }
56:
57: # Some data
58:
1.135 bowersj2 59: # Keep these mappings in sync with lonquickgrades, which uses the colors
60: # instead of the icons.
61: my %statusIconMap =
62: ( Apache::lonnavmaps::resource->NETWORK_FAILURE => '',
63: Apache::lonnavmaps::resource->NOTHING_SET => '',
64: Apache::lonnavmaps::resource->CORRECT => 'navmap.correct.gif',
65: Apache::lonnavmaps::resource->EXCUSED => 'navmap.correct.gif',
66: Apache::lonnavmaps::resource->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
67: Apache::lonnavmaps::resource->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
68: Apache::lonnavmaps::resource->ANSWER_OPEN => 'navmap.wrong.gif',
69: Apache::lonnavmaps::resource->OPEN_LATER => '',
70: Apache::lonnavmaps::resource->TRIES_LEFT => 'navmap.open.gif',
71: Apache::lonnavmaps::resource->INCORRECT => 'navmap.wrong.gif',
72: Apache::lonnavmaps::resource->OPEN => 'navmap.open.gif',
73: Apache::lonnavmaps::resource->ATTEMPTED => 'navmap.open.gif' );
74:
75: my %iconAltTags =
76: ( 'navmap.correct.gif' => 'Correct',
77: 'navmap.wrong.gif' => 'Incorrect',
78: 'navmap.open.gif' => 'Open' );
1.133 bowersj2 79:
1.136 bowersj2 80: # Defines a status->color mapping, null string means don't color
81: my %colormap =
82: ( Apache::lonnavmaps::resource->NETWORK_FAILURE => '',
83: Apache::lonnavmaps::resource->CORRECT => '',
84: Apache::lonnavmaps::resource->EXCUSED => '#3333FF',
85: Apache::lonnavmaps::resource->PAST_DUE_ANSWER_LATER => '',
86: Apache::lonnavmaps::resource->PAST_DUE_NO_ANSWER => '',
87: Apache::lonnavmaps::resource->ANSWER_OPEN => '#006600',
88: Apache::lonnavmaps::resource->OPEN_LATER => '',
89: Apache::lonnavmaps::resource->TRIES_LEFT => '',
90: Apache::lonnavmaps::resource->INCORRECT => '',
91: Apache::lonnavmaps::resource->OPEN => '',
92: Apache::lonnavmaps::resource->NOTHING_SET => '' );
93: # And a special case in the nav map; what to do when the assignment
94: # is not yet done and due in less then 24 hours
95: my $hurryUpColor = "#FF0000";
96:
1.130 www 97: sub cleanup {
98: if (tied(%navmaphash)){
99: &Apache::lonnet::logthis('Cleanup navmaps: navmaphash');
100: unless (untie(%navmaphash)) {
101: &Apache::lonnet::logthis('Failed cleanup navmaps: navmaphash');
102: }
103: }
104: if (tied(%parmhash)){
105: &Apache::lonnet::logthis('Cleanup navmaps: parmhash');
106: unless (untie(%parmhash)) {
107: &Apache::lonnet::logthis('Failed cleanup navmaps: parmhash');
108: }
109: }
110: }
111:
1.1 www 112: sub handler {
1.99 bowersj2 113: my $r = shift;
1.118 bowersj2 114: real_handler($r);
115: }
116:
117: sub real_handler {
118: my $r = shift;
1.2 www 119:
1.51 bowersj2 120: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
121:
122: # Handle header-only request
123: if ($r->header_only) {
124: if ($ENV{'browser.mathml'}) {
125: $r->content_type('text/xml');
126: } else {
127: $r->content_type('text/html');
128: }
129: $r->send_http_header;
130: return OK;
131: }
132:
133: # Send header, don't cache this page
134: if ($ENV{'browser.mathml'}) {
135: $r->content_type('text/xml');
136: } else {
137: $r->content_type('text/html');
138: }
139: &Apache::loncommon::no_cache($r);
140: $r->send_http_header;
141:
1.106 bowersj2 142: # Create the nav map
1.51 bowersj2 143: my $navmap = Apache::lonnavmaps::navmap->new(
144: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 145: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 146:
1.55 bowersj2 147:
148: if (!defined($navmap)) {
149: my $requrl = $r->uri;
150: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
151: return HTTP_NOT_ACCEPTABLE;
152: }
1.64 bowersj2 153:
1.111 bowersj2 154: $r->print("<html><head>\n");
1.118 bowersj2 155: $r->print("<title>Navigate Course Contents</title></head>");
1.111 bowersj2 156:
1.64 bowersj2 157: # Header
1.111 bowersj2 158: $r->print(&Apache::loncommon::bodytag('Navigate Course Contents','',
1.64 bowersj2 159: ''));
160: $r->print('<script>window.focus();</script>');
1.101 bowersj2 161:
1.124 bowersj2 162: $r->rflush();
163:
164: # Now that we've displayed some stuff to the user, init the navmap
165: $navmap->init();
166:
1.95 bowersj2 167: $r->print('<table border="0" cellpadding="2" cellspacing="0">');
1.64 bowersj2 168: my $date=localtime;
1.95 bowersj2 169: $r->print('<tr><td align="right" valign="bottom">Key: </td>');
1.101 bowersj2 170:
171: # Print discussions and feedback header
1.65 bowersj2 172: if ($navmap->{LAST_CHECK}) {
1.95 bowersj2 173: $r->print('<td align="center" valign="bottom"> '.
174: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1.73 bowersj2 175: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1.95 bowersj2 176: '</td><td align="center" valign="bottom"> '.
177: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
178: '</td>');
179: } else {
180: $r->print('<td align="center" valign="bottom"> '.
181: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
182: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
183: '</td>');
184: }
185: $r->print('</tr></table>');
1.101 bowersj2 186:
1.95 bowersj2 187: my $condition = 0;
188: if ($ENV{'form.condition'}) {
189: $condition = 1;
190: }
191:
1.118 bowersj2 192: # Determine where the "here" marker is and where the screen jumps to.
1.133 bowersj2 193: my $hereType; # the type of marker, SYMB, URL, or NOTHING
1.118 bowersj2 194: my $here; # the actual URL or SYMB for the here marker
1.133 bowersj2 195: my $jumpType; # The type of the thing we have a jump for, SYMB or URL
1.118 bowersj2 196: my $jump; # the SYMB/URL of the resource we need to jump to
197:
198: if ( $ENV{'form.alreadyHere'} ) { # we came from a user's manipulation of the nav page
199: # If this is a click on a folder or something, we want to preserve the "here"
200: # from the querystring, and get the new "jump" marker
201: $hereType = $ENV{'form.hereType'};
202: $here = $ENV{'form.here'};
1.133 bowersj2 203: $jumpType = $ENV{'form.jumpType'} || NOTHING();
1.118 bowersj2 204: $jump = $ENV{'form.jump'};
205: } else { # the user is visiting the nav map from the remote
206: # We're coming from the remote. We have either a url, a symb, or nothing,
207: # and we need to figure out what.
208: # Preference: Symb
209:
210: if ($ENV{'form.symb'}) {
1.133 bowersj2 211: $hereType = $jumpType = SYMB();
1.118 bowersj2 212: $here = $jump = $ENV{'form.symb'};
213: } elsif ($ENV{'form.postdata'}) {
214: # couldn't find a symb, is there a URL?
215: my $currenturl = $ENV{'form.postdata'};
216: $currenturl=~s/^http\:\/\///;
217: $currenturl=~s/^[^\/]+//;
218:
1.133 bowersj2 219: $hereType = $jumpType = URL;
1.118 bowersj2 220: $here = $jump = $currenturl;
221: } else {
222: # Nothing
1.133 bowersj2 223: $hereType = $jumpType = NOTHING();
1.118 bowersj2 224: }
225: }
1.110 bowersj2 226:
1.118 bowersj2 227:
1.110 bowersj2 228: # alreadyHere allows us to only open the maps necessary to view
229: # the current location once, while at the same time remembering
230: # the current location. Without that check, the user would never
231: # be able to close those maps; the user would close it, and the
232: # currenturl scan would re-open it.
1.118 bowersj2 233: my $queryAdd = "&alreadyHere=1";
1.110 bowersj2 234:
1.95 bowersj2 235: if ($condition) {
1.118 bowersj2 236: $r->print("<a href=\"navmaps?condition=0&filter=&$queryAdd" .
237: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
238: "\">Close All Folders</a>");
1.65 bowersj2 239: } else {
1.118 bowersj2 240: $r->print("<a href=\"navmaps?condition=1&filter=&$queryAdd" .
241: "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
242: "\">Open All Folders</a>");
1.65 bowersj2 243: }
1.55 bowersj2 244:
1.95 bowersj2 245: $r->print('<br> ');
246: $r->rflush();
247:
1.55 bowersj2 248: # Check that it's defined
249: if (!($navmap->courseMapDefined())) {
250: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
251: '</body></html>');
252: return OK;
253: }
254:
1.51 bowersj2 255: # Grab a resource object so we have access to the constants; this
256: # is technically not proper, but should be harmless
257: my $res = $navmap->firstResource();
258:
1.101 bowersj2 259: # These are some data tables, which make it easy to change some of
260: # of the specific visualization parameters if desired.
261:
1.59 bowersj2 262: my %condenseStatuses =
1.66 bowersj2 263: ( $res->NETWORK_FAILURE => 1,
264: $res->NOTHING_SET => 1,
265: $res->CORRECT => 1 );
1.51 bowersj2 266:
267: my %filterHash;
268: # Figure out what we're not displaying
269: foreach (split(/\,/, $ENV{"form.filter"})) {
270: if ($_) {
271: $filterHash{$_} = "1";
272: }
273: }
274:
1.88 bowersj2 275: # Is this a new-style course? If so, we want to suppress showing the top-level
276: # maps in their own folders, in favor of "inlining" them.
277: my $topResource = $navmap->getById("0.0");
1.63 bowersj2 278:
1.51 bowersj2 279: # Begin the HTML table
1.59 bowersj2 280: # four cols: resource + indent, chat+feedback, icon, text string
1.85 bowersj2 281: $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
1.51 bowersj2 282:
1.74 bowersj2 283: # This needs to be updated to use symbs from the remote,
284: # instead of uris. The changes to this and the main rendering
285: # loop should be obvious.
286: # Here's a simple example of the iterator.
1.88 bowersj2 287: # Preprocess the map: Look for current URL, force inlined maps to display
288:
1.118 bowersj2 289: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.88 bowersj2 290: my $found = 0;
291: my $depth = 1;
1.118 bowersj2 292: my $currentJumpIndex = 0; # keeps track of when the current resource is found,
1.91 bowersj2 293: # so we can back up a few and put the anchor above the
294: # current resource
1.118 bowersj2 295: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1.101 bowersj2 296: # before the current resource when using #current
1.88 bowersj2 297: $mapIterator->next(); # discard the first BEGIN_MAP
298: my $curRes = $mapIterator->next();
1.91 bowersj2 299: my $counter = 0;
1.133 bowersj2 300: my $foundJump = ($jumpType == NOTHING()); # look for jump point if we have one
1.118 bowersj2 301: my $looped = 0;
1.116 bowersj2 302:
303: # We only need to do this if we need to open the maps to show the
1.118 bowersj2 304: # current position. This will change the counter so we can't count
305: # for the jump marker with this loop.
1.116 bowersj2 306: while ($depth > 0 && !$ENV{'form.alreadyHere'}) {
1.96 bowersj2 307: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
308: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.120 bowersj2 309:
1.118 bowersj2 310: if (ref($curRes) && !$ENV{'form.alreadyHere'} &&
1.133 bowersj2 311: ($hereType == SYMB() && $curRes->symb() eq $here) ||
312: (ref($curRes) && $hereType == URL() && $curRes->src() eq $here)) {
1.118 bowersj2 313: my $mapStack = $mapIterator->getStack();
314:
315: # Ensure the parent maps are open
316: for my $map (@{$mapStack}) {
317: if ($condition) {
318: undef $filterHash{$map->map_pc()};
319: } else {
320: $filterHash{$map->map_pc()} = 1;
321: }
322: }
323: $ENV{'form.alreadyHere'} = 1;
324: }
325: $looped = 1;
326:
327: $curRes = $mapIterator->next();
328: }
329:
330: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 0);
331: $depth = 1;
332: $mapIterator->next();
333: $curRes = $mapIterator->next();
1.88 bowersj2 334:
1.118 bowersj2 335: while ($depth > 0 && !$foundJump) {
336: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
337: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.91 bowersj2 338: if (ref($curRes)) { $counter++; }
339:
1.118 bowersj2 340: if (ref($curRes) &&
1.133 bowersj2 341: (($jumpType == SYMB() && $curRes->symb() eq $jump) ||
342: ($jumpType == URL() && $curRes->src() eq $jump))) {
1.88 bowersj2 343: # If this is the correct resource, be sure to
344: # show it by making sure the containing maps
345: # are open.
1.91 bowersj2 346:
1.101 bowersj2 347: # This is why we have to use the main iterator instead of the
348: # potentially faster DFS: The count has to be the same, so
349: # the order has to be the same, which DFS won't give us.
1.118 bowersj2 350: $currentJumpIndex = $counter;
351: $foundJump = 1;
1.88 bowersj2 352: }
1.118 bowersj2 353:
1.88 bowersj2 354: $curRes = $mapIterator->next();
1.74 bowersj2 355: }
1.88 bowersj2 356:
1.53 bowersj2 357: undef $res; # so we don't accidentally use it later
1.72 bowersj2 358: my $indentLevel = 0;
1.132 bowersj2 359: my $indentString = "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />";
1.51 bowersj2 360:
361: my $isNewBranch = 0;
1.59 bowersj2 362: my $now = time();
363: my $in24Hours = $now + 24 * 60 * 60;
1.78 bowersj2 364: my $displayedHereMarker = 0;
1.118 bowersj2 365: my $displayedJumpMarker = 0;
1.88 bowersj2 366:
1.72 bowersj2 367: # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
368: # code in iterator->next), so ignore the first one
1.89 bowersj2 369: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
1.74 bowersj2 370: $condition);
1.72 bowersj2 371: $mapIterator->next();
1.89 bowersj2 372: $curRes = $mapIterator->next();
1.90 bowersj2 373: $depth = 1;
1.88 bowersj2 374:
375: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
376: my $rowNum = 0;
1.51 bowersj2 377:
1.91 bowersj2 378: $counter = 0;
379:
1.72 bowersj2 380: while ($depth > 0) {
1.51 bowersj2 381: if ($curRes == $mapIterator->BEGIN_MAP() ||
1.52 bowersj2 382: $curRes == $mapIterator->BEGIN_BRANCH()) {
1.51 bowersj2 383: $indentLevel++;
384: }
385: if ($curRes == $mapIterator->END_MAP() ||
1.52 bowersj2 386: $curRes == $mapIterator->END_BRANCH()) {
1.51 bowersj2 387: $indentLevel--;
388: }
1.52 bowersj2 389: if ($curRes == $mapIterator->BEGIN_BRANCH()) {
390: $isNewBranch = 1;
1.72 bowersj2 391: }
1.96 bowersj2 392: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
393: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.51 bowersj2 394:
1.91 bowersj2 395: if (ref($curRes)) { $counter++; }
396:
1.116 bowersj2 397: if (ref($curRes)) {
1.51 bowersj2 398:
1.113 bowersj2 399: my $deltalevel = $isNewBranch? 1 : 0; # reserves space for branch icon
400:
1.116 bowersj2 401: if ($indentLevel - $deltalevel < 0) {
1.113 bowersj2 402: # If this would be at a negative depth (top-level maps in
403: # new-style courses, we want to suppress their title display)
404: # then ignore it.
405: $curRes = $mapIterator->next();
406: next;
407: }
408:
1.66 bowersj2 409: # Step one: Decide which parts to show
410: my @parts = @{$curRes->parts()};
411: my $multipart = scalar(@parts) > 1;
412: my $condensed = 0;
413:
1.51 bowersj2 414: if ($curRes->is_problem()) {
1.101 bowersj2 415:
1.66 bowersj2 416: # Is it multipart?
417: if ($multipart) {
418: # If it's multipart, see if part 0 is "open"
419: # if it is, display all parts, if it isn't,
420: # just display first
421: if (!$curRes->opendate("0")) {
1.101 bowersj2 422: # no parts are open, display as one part
423: @parts = ("0");
1.68 bowersj2 424: $condensed = 1;
1.66 bowersj2 425: } else {
426: # Otherwise, only display part 0 if we want to
427: # attach feedback or email information to it
428: if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
1.132 bowersj2 429: # Is this right? I think this will toss it
430: # if it DOES have discussion, not if it doesn't?
431: # - Jeremy (yes, commenting on his own code)
1.66 bowersj2 432: shift @parts;
433: } else {
434: # Now, we decide whether to condense the
435: # parts due to similarity
436: my $status = $curRes->status($parts[1]);
437: my $due = $curRes->duedate($parts[1]);
438: my $open = $curRes->opendate($parts[1]);
439: my $statusAllSame = 1;
440: my $dueAllSame = 1;
441: my $openAllSame = 1;
442: for (my $i = 2; $i < scalar(@parts); $i++) {
443: if ($curRes->status($parts[$i]) != $status){
444: $statusAllSame = 0;
445: }
446: if ($curRes->duedate($parts[$i]) != $due ) {
447: $dueAllSame = 0;
448: }
449: if ($curRes->opendate($parts[$i]) != $open) {
450: $openAllSame = 0;
451: }
452: }
453:
1.132 bowersj2 454: # $*allSame is true if all the statuses were
1.66 bowersj2 455: # the same. Now, if they are all the same and
456: # match one of the statuses to condense, or they
457: # are all open with the same due date, or they are
458: # all OPEN_LATER with the same open date, display the
459: # status of the first non-zero part (to get the 'correct'
460: # status right, since 0 is never 'correct' or 'open').
461: if (($statusAllSame && defined($condenseStatuses{$status})) ||
462: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
463: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
464: @parts = ($parts[1]);
465: $condensed = 1;
466: }
467: }
468: }
469: }
1.59 bowersj2 470:
1.51 bowersj2 471: } else {
1.84 bowersj2 472: $parts[0] = "0"; # this is to get past foreach loop below
1.51 bowersj2 473: # you can consider a non-problem resource as a resource
1.101 bowersj2 474: # with only one part without loss, and it simplifies the looping
1.51 bowersj2 475: }
476:
1.83 bowersj2 477: # Is it a multipart problem with a single part, now in
1.101 bowersj2 478: # @parts with "0" filtered out? If so, 'forget' it's a multi-part
1.83 bowersj2 479: # problem and treat it like a single-part problem.
480: if ( scalar(@parts) == 1 ) {
481: $multipart = 0;
482: }
483:
1.66 bowersj2 484: # Display one part, in event of network error.
485: # If this is a single part, we can at least show the correct
1.101 bowersj2 486: # status, but if it's multipart, we're lost, since we can't
487: # retreive the metadata to count the parts
1.66 bowersj2 488: if ($curRes->{RESOURCE_ERROR}) {
489: @parts = ("0");
490: }
491:
1.101 bowersj2 492: # Step Two: Print the actual data.
493:
494: # For each part we intend to display...
1.51 bowersj2 495: foreach my $part (@parts) {
1.59 bowersj2 496:
1.68 bowersj2 497: my $nonLinkedText = ""; # unlinked stuff after title
1.51 bowersj2 498:
499: my $stack = $mapIterator->getStack();
500: my $src = getLinkForResource($stack);
501:
1.101 bowersj2 502: # Pass the correct symb on the querystring, so the
503: # remote will figure out where we are if we click a link
1.51 bowersj2 504: my $srcHasQuestion = $src =~ /\?/;
505: my $link = $src.
506: ($srcHasQuestion?'&':'?') .
507: 'symb='.&Apache::lonnet::escape($curRes->symb()).
508: '"';
1.101 bowersj2 509:
1.106 bowersj2 510: my $title = $curRes->compTitle();
1.122 www 511: if ($src=~/^\/uploaded\//) {
512: $nonLinkedText=$title;
513: $title='';
514: }
1.51 bowersj2 515: my $partLabel = "";
1.52 bowersj2 516: my $newBranchText = "";
517:
518: # If this is a new branch, label it so
519: if ($isNewBranch) {
1.59 bowersj2 520: $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
1.52 bowersj2 521: $isNewBranch = 0;
522: }
1.51 bowersj2 523:
524: # links to open and close the folders
525: my $linkopen = "<a href=\"$link\">";
526: my $linkclose = "</a>";
527:
1.61 bowersj2 528: my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";
1.51 bowersj2 529: if ($curRes->is_problem()) {
1.66 bowersj2 530: if ($part eq "0" || $condensed) {
531: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />';
532: } else {
533: $icon = $indentString;
534: }
1.51 bowersj2 535: }
536:
537: # Display the correct icon, link to open or shut map
538: if ($curRes->is_map()) {
539: my $mapId = $curRes->map_pc();
1.82 bowersj2 540: my $nowOpen = (!defined($filterHash{$mapId}));
541: if ($condition) {$nowOpen = !$nowOpen;}
1.51 bowersj2 542: $icon = $nowOpen ?
1.77 bowersj2 543: "navmap.folder.closed.gif" : "navmap.folder.open.gif";
1.66 bowersj2 544: $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";
1.52 bowersj2 545: $linkopen = "<a href=\"/adm/navmaps?filter=";
1.66 bowersj2 546: $linkopen .= ($nowOpen xor $condition) ?
1.51 bowersj2 547: addToFilter(\%filterHash, $mapId) :
548: removeFromFilter(\%filterHash, $mapId);
1.118 bowersj2 549: $linkopen .= "&condition=$condition&$queryAdd" .
550: "&hereType=$hereType&here=" .
1.133 bowersj2 551: Apache::lonnet::escape($here) . "&jumpType=".SYMB()."&" .
1.118 bowersj2 552: "jump=" . Apache::lonnet::escape($curRes->symb()) ."\">";
1.51 bowersj2 553: $linkclose = "</a>";
1.68 bowersj2 554:
1.51 bowersj2 555: }
556:
1.86 bowersj2 557: my $color;
1.51 bowersj2 558: if ($curRes->is_problem()) {
1.115 bowersj2 559: $color = $colormap{$curRes->status};
1.74 bowersj2 560:
1.115 bowersj2 561: if (dueInLessThen24Hours($curRes, $part) ||
562: lastTry($curRes, $part)) {
1.79 bowersj2 563: $color = $hurryUpColor;
564: }
1.51 bowersj2 565: }
566:
1.68 bowersj2 567: if ($curRes->randomout()) {
568: $nonLinkedText .= ' <i>(hidden)</i> ';
569: }
570:
1.88 bowersj2 571: $rowNum++;
572: my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
573:
1.91 bowersj2 574: # FIRST COL: The resource indentation, branch icon, name, and anchor
1.116 bowersj2 575: $r->print(" <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\">\n");
1.51 bowersj2 576:
1.101 bowersj2 577: # Print the anchor if necessary
1.118 bowersj2 578: if ($counter == $currentJumpIndex - $currentJumpDelta ) {
579: $r->print('<a name="curloc" />');
580: $displayedJumpMarker = 1;
1.91 bowersj2 581: }
582:
1.51 bowersj2 583: # print indentation
1.116 bowersj2 584: for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {
1.51 bowersj2 585: $r->print($indentString);
586: }
587:
1.61 bowersj2 588: $r->print(" ${newBranchText}${linkopen}$icon${linkclose}\n");
1.51 bowersj2 589:
1.74 bowersj2 590: my $curMarkerBegin = "";
591: my $curMarkerEnd = "";
592:
593: # Is this the current resource?
1.118 bowersj2 594: if (!$displayedHereMarker &&
1.133 bowersj2 595: (($hereType == SYMB() && $curRes->symb eq $here) ||
596: ($hereType == URL() && $curRes->src eq $here))) {
1.118 bowersj2 597: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1.74 bowersj2 598: $curMarkerEnd = '<font color="red" size="+2"> <</font>';
1.78 bowersj2 599: $displayedHereMarker = 1;
1.74 bowersj2 600: }
601:
1.69 bowersj2 602: if ($curRes->is_problem() && $part ne "0" && !$condensed) {
1.66 bowersj2 603: $partLabel = " (Part $part)";
604: $title = "";
605: }
1.83 bowersj2 606: if ($multipart && $condensed) {
1.68 bowersj2 607: $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';
1.66 bowersj2 608: }
1.59 bowersj2 609:
1.74 bowersj2 610: $r->print(" $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
1.66 bowersj2 611:
1.118 bowersj2 612: #if ($curRes->{RESOURCE_ERROR}) {
613: # $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
614: # '<font size="-1">Host down</font>'));
615: # }
1.66 bowersj2 616:
1.113 bowersj2 617: $r->print("</td>\n");
618:
1.101 bowersj2 619: # SECOND COL: Is there text, feedback, errors??
1.124 bowersj2 620: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1.66 bowersj2 621:
622: if ($curRes->hasDiscussion()) {
623: $discussionHTML = $linkopen .
624: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
625: $linkclose;
626: }
627:
628: if ($curRes->getFeedback()) {
629: my $feedback = $curRes->getFeedback();
630: foreach (split(/\,/, $feedback)) {
631: if ($_) {
632: $feedbackHTML .= ' <a href="/adm/email?display='
633: . &Apache::lonnet::escape($_) . '">'
634: . '<img src="/adm/lonMisc/feedback.gif" '
635: . 'border="0" /></a>';
636: }
637: }
638: }
639:
1.124 bowersj2 640: if ($curRes->getErrors()) {
641: my $errors = $curRes->getErrors();
642: foreach (split(/,/, $errors)) {
643: if ($_) {
644: $errorHTML .= ' <a href="/adm/email?display='
645: . &Apache::lonnet::escape($_) . '">'
646: . '<img src="/adm/lonMisc/bomb.gif" '
647: . 'border="0" /></a>';
648: }
649: }
650: }
651:
652: $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>");
1.66 bowersj2 653:
654: # Is this the first displayed part of a multi-part problem
655: # that has not been condensed, so we should suppress these two
1.101 bowersj2 656: # columns so we don't display useless status info about part
657: # "0"?
1.66 bowersj2 658: my $firstDisplayed = !$condensed && $multipart && $part eq "0";
659:
1.69 bowersj2 660: # THIRD COL: Problem status icon
1.66 bowersj2 661: if ($curRes->is_problem() &&
662: !$firstDisplayed) {
663: my $icon = $statusIconMap{$curRes->status($part)};
1.69 bowersj2 664: my $alt = $iconAltTags{$icon};
1.66 bowersj2 665: if ($icon) {
1.84 bowersj2 666: $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");
1.66 bowersj2 667: } else {
1.84 bowersj2 668: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 669: }
670: } else { # not problem, no icon
1.84 bowersj2 671: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 672: }
673:
1.69 bowersj2 674: # FOURTH COL: Text description
1.86 bowersj2 675: $r->print("<td align=\"right\" valign=\"center\">\n");
1.51 bowersj2 676:
1.61 bowersj2 677: if ($curRes->kind() eq "res" &&
678: $curRes->is_problem() &&
1.66 bowersj2 679: !$firstDisplayed) {
1.86 bowersj2 680: $r->print ("<font color=\"$color\"><b>") if ($color);
1.53 bowersj2 681: $r->print (getDescription($curRes, $part));
1.86 bowersj2 682: $r->print ("</b></font>") if ($color);
1.51 bowersj2 683: }
1.68 bowersj2 684: if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {
685: $r->print('(randomly select ' . $curRes->randompick() .')');
686: }
1.59 bowersj2 687:
1.84 bowersj2 688: $r->print(" </td></tr>\n");
1.113 bowersj2 689:
690: if (!($counter % 20)) { $r->rflush(); }
691: if ($counter == 2) { $r->rflush(); }
1.51 bowersj2 692: }
693: }
694: $curRes = $mapIterator->next();
695: }
696:
1.118 bowersj2 697: $r->print("</table>");
698:
699: # Print out the part that jumps to #curloc if it exists
700: if ($displayedJumpMarker) {
701: $r->print('<script>location += "#curloc";</script>');
702: }
703:
1.133 bowersj2 704: # renderer call
705: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 0);
706: my $render = render({ 'cols' => [0,1,2,3], 'iterator' => $mapIterator,
707: 'url' => '/adm/navmaps',
708: 'queryString' => 'alreadyHere=1' });
709: $r->print('|' . $render . '|');
710:
1.126 bowersj2 711: $navmap->untieHashes();
1.51 bowersj2 712:
1.128 bowersj2 713: $r->print("</body></html>");
1.134 bowersj2 714: $r->rflush();
1.59 bowersj2 715:
1.51 bowersj2 716: return OK;
717: }
718:
719: # Convenience functions: Returns a string that adds or subtracts
720: # the second argument from the first hash, appropriate for the
721: # query string that determines which folders to recurse on
722: sub addToFilter {
723: my $hashIn = shift;
724: my $addition = shift;
725: my %hash = %$hashIn;
726: $hash{$addition} = 1;
727:
728: return join (",", keys(%hash));
729: }
730:
731: sub removeFromFilter {
732: my $hashIn = shift;
733: my $subtraction = shift;
734: my %hash = %$hashIn;
735:
736: delete $hash{$subtraction};
737: return join(",", keys(%hash));
738: }
739:
740: # Convenience function: Given a stack returned from getStack on the iterator,
741: # return the correct src() value.
742: # Later, this should add an anchor when we start putting anchors in pages.
743: sub getLinkForResource {
744: my $stack = shift;
745: my $res;
746:
747: # Check to see if there are any pages in the stack
748: foreach $res (@$stack) {
749: if (defined($res) && $res->is_page()) {
750: return $res->src();
751: }
752: }
753:
754: # Failing that, return the src of the last resource that is defined
755: # (when we first recurse on a map, it puts an undefined resource
756: # on the bottom because $self->{HERE} isn't defined yet, and we
757: # want the src for the map anyhow)
758: foreach (@$stack) {
759: if (defined($_)) { $res = $_; }
760: }
761:
762: return $res->src();
763: }
764:
1.53 bowersj2 765: # Convenience function: This seperates the logic of how to create
766: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
767: # etc.) into a seperate function. It takes a resource object as the
768: # first parameter, and the part number of the resource as the second.
769: # It's basically a big switch statement on the status of the resource.
770:
771: sub getDescription {
772: my $res = shift;
773: my $part = shift;
1.69 bowersj2 774: my $status = $res->status($part);
1.53 bowersj2 775:
776: if ($status == $res->NETWORK_FAILURE) { return ""; }
777: if ($status == $res->NOTHING_SET) {
778: return "Not currently assigned.";
779: }
780: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 781: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 782: }
783: if ($status == $res->OPEN) {
1.79 bowersj2 784: if ($res->duedate($part)) {
1.73 bowersj2 785: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 786: } else {
787: return "Open, no due date";
788: }
1.53 bowersj2 789: }
1.54 bowersj2 790: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 791: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 792: }
793: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 794: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 795: }
796: if ($status == $res->ANSWER_OPEN) {
797: return "Answer available";
798: }
1.59 bowersj2 799: if ($status == $res->EXCUSED) {
1.66 bowersj2 800: return "Excused by instructor";
1.59 bowersj2 801: }
1.69 bowersj2 802: if ($status == $res->ATTEMPTED) {
803: return "Not yet graded.";
804: }
1.59 bowersj2 805: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 806: my $tries = $res->tries($part);
807: my $maxtries = $res->maxtries($part);
808: my $triesString = "";
809: if ($tries && $maxtries) {
810: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
811: if ($maxtries > 1 && $maxtries - $tries == 1) {
812: $triesString = "<b>$triesString</b>";
813: }
814: }
1.66 bowersj2 815: if ($res->duedate()) {
1.73 bowersj2 816: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 817: " $triesString";
818: } else {
819: return "No due date $triesString";
820: }
1.59 bowersj2 821: }
1.53 bowersj2 822: }
823:
1.115 bowersj2 824: # Convenience function, so others can use it: Is the problem due in less then
825: # 24 hours, and still can be done?
826:
827: sub dueInLessThen24Hours {
828: my $res = shift;
829: my $part = shift;
830: my $status = $res->status($part);
831:
832: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
833: $status == $res->TRIES_LEFT()) &&
834: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
835: $res->duedate() > time();
836: }
837:
838: # Convenience function, so others can use it: Is there only one try remaining for the
839: # part, with more then one try to begin with, not due yet and still can be done?
840: sub lastTry {
841: my $res = shift;
842: my $part = shift;
843:
844: my $tries = $res->tries($part);
845: my $maxtries = $res->maxtries($part);
846: return $tries && $maxtries && $maxtries > 1 &&
847: $maxtries - $tries == 1 && $res->duedate() &&
848: $res->duedate() > time();
849: }
850:
1.101 bowersj2 851: # This puts a human-readable name on the ENV variable.
1.68 bowersj2 852: sub advancedUser {
853: return $ENV{'user.adv'};
854: }
855:
1.73 bowersj2 856:
857: # timeToHumanString takes a time number and converts it to a
858: # human-readable representation, meant to be used in the following
859: # manner:
860: # print "Due $timestring"
861: # print "Open $timestring"
862: # print "Answer available $timestring"
863: # Very, very, very, VERY English-only... goodness help a localizer on
864: # this func...
1.53 bowersj2 865: sub timeToHumanString {
1.58 albertel 866: my ($time) = @_;
867: # zero, '0' and blank are bad times
1.73 bowersj2 868: if (!$time) {
869: return 'never';
870: }
871:
872: my $now = time();
873:
874: my @time = localtime($time);
875: my @now = localtime($now);
876:
877: # Positive = future
878: my $delta = $time - $now;
879:
880: my $minute = 60;
881: my $hour = 60 * $minute;
882: my $day = 24 * $hour;
883: my $week = 7 * $day;
884: my $inPast = 0;
885:
886: # Logic in comments:
887: # Is it now? (extremely unlikely)
888: if ( $delta == 0 ) {
889: return "this instant";
890: }
891:
892: if ($delta < 0) {
893: $inPast = 1;
894: $delta = -$delta;
895: }
896:
897: if ( $delta > 0 ) {
1.101 bowersj2 898:
1.73 bowersj2 899: my $tense = $inPast ? " ago" : "";
900: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 901:
902: # Less then a minute
1.73 bowersj2 903: if ( $delta < $minute ) {
904: if ($delta == 1) { return "${prefix}1 second$tense"; }
905: return "$prefix$delta seconds$tense";
906: }
907:
1.101 bowersj2 908: # Less then an hour
1.73 bowersj2 909: if ( $delta < $hour ) {
910: # If so, use minutes
911: my $minutes = floor($delta / 60);
912: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
913: return "$prefix$minutes minutes$tense";
914: }
915:
916: # Is it less then 24 hours away? If so,
917: # display hours + minutes
918: if ( $delta < $hour * 24) {
919: my $hours = floor($delta / $hour);
920: my $minutes = floor(($delta % $hour) / $minute);
921: my $hourString = "$hours hours";
922: my $minuteString = ", $minutes minutes";
923: if ($hours == 1) {
924: $hourString = "1 hour";
925: }
926: if ($minutes == 1) {
927: $minuteString = ", 1 minute";
928: }
929: if ($minutes == 0) {
930: $minuteString = "";
931: }
932: return "$prefix$hourString$minuteString$tense";
933: }
934:
935: # Less then 5 days away, display day of the week and
936: # HH:MM
937: if ( $delta < $day * 5 ) {
1.85 bowersj2 938: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 939: $timeStr =~ s/12:00 am/midnight/;
940: $timeStr =~ s/12:00 pm/noon/;
941: return ($inPast ? "last " : "next ") .
942: $timeStr;
943: }
944:
945: # Is it this year?
946: if ( $time[5] == $now[5]) {
947: # Return on Month Day, HH:MM meridian
948: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
949: $timeStr =~ s/12:00 am/midnight/;
950: $timeStr =~ s/12:00 pm/noon/;
951: return $timeStr;
952: }
953:
954: # Not this year, so show the year
955: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
956: $timeStr =~ s/12:00 am/midnight/;
957: $timeStr =~ s/12:00 pm/noon/;
958: return $timeStr;
1.58 albertel 959: }
1.53 bowersj2 960: }
961:
1.51 bowersj2 962:
1.133 bowersj2 963: =pod
964:
965: =head1 navmap renderer
966:
967: The navmaprenderer package provides a sophisticated rendering of the standard navigation maps interface into HTML. The provided nav map handler is actually just a glorified call to this.
968:
969: Because of the large number of parameters this function presents, instead of passing it arguments as is normal, pass it in an anonymous hash with the given options. This is because there is no obvious order you may wish to override these in and a hash is easier to read and understand then "undef, undef, undef, 1, undef, undef, renderButton, undef, 0" when you mostly want default behaviors.
970:
971: The package provides a function called 'render', called as Apache::lonnavmaps::renderer->render({}).
1.51 bowersj2 972:
1.133 bowersj2 973: =head2 Overview of Columns
1.51 bowersj2 974:
1.133 bowersj2 975: The renderer will build an HTML table for the navmap and return it. The table is consists of several columns, and a row for each resource (or possibly each part). You tell the renderer how many columns to create and what to place in each column, optionally using one or more of the preparent columns, and the renderer will assemble the table.
1.51 bowersj2 976:
1.133 bowersj2 977: Any additional generally useful column types should be placed in the renderer code here, so anybody can use it anywhere else. Any code specific to the current application (such as the addition of <input> elements in a column) should be placed in the code of the thing using the renderer.
1.51 bowersj2 978:
1.133 bowersj2 979: At the core of the renderer is the array reference COLS (see Example section below for how to pass this correctly). The COLS array will consist of entries of one of two types of things: Either an integer representing one of the pre-packaged column types, or a sub reference that takes a resource reference, a part number, and a reference to the argument hash passed to the renderer, and returns a string that will be inserted into the HTML representation as it.
1.51 bowersj2 980:
1.133 bowersj2 981: The pre-packaged column names are refered to by constants in the Apache::lonnavmaps::renderer namespace. The following currently exist:
1.51 bowersj2 982:
1.133 bowersj2 983: =over 4
1.51 bowersj2 984:
1.133 bowersj2 985: =item * B<resource>: The general info about the resource: Link, icon for the type, etc. The first column in the standard nav map display. This column also accepts the following parameter in the renderer hash:
1.51 bowersj2 986:
987: =over 4
988:
1.133 bowersj2 989: =item * B<resource_nolink>: If true, the resource will not be linked. Default: false, resource will have links.
990:
991: =item * B<resource_part_count>: If true (default), the resource will show a part count if the full part list is not displayed. If false, the resource will never show a part count.
992:
993: =back
1.51 bowersj2 994:
1.133 bowersj2 995: =item B<communication_status>: Whether there is discussion on the resource, email for the user, or (lumped in here) perl errors in the execution of the problem. This is the second column in the main nav map.
1.51 bowersj2 996:
1.133 bowersj2 997: =item B<quick_status>: An icon for the status of a problem, with four possible states: Correct, incorrect, open, or none (not open yet, not a problem). The third column of the standard navmap.
1.51 bowersj2 998:
1.133 bowersj2 999: =item B<long_status>: A text readout of the details of the current status of the problem, such as "Due in 22 hours". The fourth column of the standard navmap.
1.51 bowersj2 1000:
1.133 bowersj2 1001: =back
1.51 bowersj2 1002:
1.133 bowersj2 1003: If you add any others please be sure to document them here.
1.51 bowersj2 1004:
1.133 bowersj2 1005: An example of a column renderer that will show the ID number of a resource, along with the part name if any:
1.51 bowersj2 1006:
1.133 bowersj2 1007: sub {
1008: my ($resource, $part, $params) = @_;
1009: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
1010: return '<td>' . $resource->{ID} . '</td>';
1011: }
1.51 bowersj2 1012:
1.133 bowersj2 1013: Note these functions are responsible for the TD tags, which allow them to override vertical and horizontal alignment, etc.
1.130 www 1014:
1.133 bowersj2 1015: =head2 Parameters
1.115 bowersj2 1016:
1.133 bowersj2 1017: =over 4
1.51 bowersj2 1018:
1.133 bowersj2 1019: =item * B<iterator>: A reference to a fresh ::iterator to use from the navmaps. The rendering will reflect the options passed to the iterator, so you can use that to just render a certain part of the course, if you like.
1.92 bowersj2 1020:
1.133 bowersj2 1021: =item * B<cols>: An array reference
1.92 bowersj2 1022:
1.133 bowersj2 1023: =item * B<showParts>: A flag. If yes (default), a line for the resource itself, and a line for each part will be displayed. If not, only one line for each resource will be displayed.
1.51 bowersj2 1024:
1.133 bowersj2 1025: =item * B<condenseParts>: A flag. If yes (default), if all parts of the problem have the same status and that status is Nothing Set, Correct, or Network Failure, then only one line will be displayed for that resource anyhow. If no, all parts will always be displayed. If showParts is 0, this is ignored.
1.55 bowersj2 1026:
1.133 bowersj2 1027: =item * B<jumpCount>: A string identifying the URL to place the anchor 'curloc' at. Default to no anchor at all. It is the responsibility of the renderer user to ensure that the #curloc is in the URL.
1.84 bowersj2 1028:
1.133 bowersj2 1029: =item * B<hereURL>: A URL identifying where to place the 'here' marker.
1.51 bowersj2 1030:
1.133 bowersj2 1031: =item * B<hereSymb>: A Symb identifying where to place the 'here' marker.
1.115 bowersj2 1032:
1.133 bowersj2 1033: =item * B<indentString>: A string identifying the indentation string to use. By default, this is a 25 pixel whitespace image with no alt text.
1.55 bowersj2 1034:
1.133 bowersj2 1035: =item * B<queryString>: A string which will be prepended to the query string used when the folders are opened or closed.
1.51 bowersj2 1036:
1.133 bowersj2 1037: =item * B<url>: The url the folders will link to, which should be the current page. Required if the resource info column is shown.
1.51 bowersj2 1038:
1.133 bowersj2 1039: =back
1.51 bowersj2 1040:
1.133 bowersj2 1041: =head2 Additional Info
1.51 bowersj2 1042:
1.133 bowersj2 1043: In addition to the parameters you can pass to the renderer, which will be passed through unchange to the column renderers, the renderer will generate the following information which your renderer may find useful:
1.59 bowersj2 1044:
1.133 bowersj2 1045: =over 4
1.59 bowersj2 1046:
1.133 bowersj2 1047: =back
1.59 bowersj2 1048:
1.133 bowersj2 1049: =cut
1.59 bowersj2 1050:
1.133 bowersj2 1051: sub resource { return 0; }
1052: sub communication_status { return 1; }
1053: sub quick_status { return 2; }
1054: sub long_status { return 3; }
1.124 bowersj2 1055:
1.133 bowersj2 1056: # Data for render_resource
1.51 bowersj2 1057:
1.133 bowersj2 1058: sub render_resource {
1059: my ($resource, $part, $params) = @_;
1.51 bowersj2 1060:
1.133 bowersj2 1061: my $nonLinkedText = ''; # stuff after resource title not in link
1.51 bowersj2 1062:
1.134 bowersj2 1063: my $link = $params->{"resourceLink"};
1064: my $src = $resource->src();
1065: my $it = $params->{"iterator"};
1.133 bowersj2 1066: my $filter = $it->{FILTER};
1067:
1068: my $title = $resource->compTitle();
1069: if ($src =~ /^\/uploaded\//) {
1070: $nonLinkedText=$title;
1071: $title = '';
1072: }
1073: my $partLabel = "";
1074: my $newBranchText = "";
1075:
1076: # If this is a new branch, label it so
1077: if ($params->{'isNewBranch'}) {
1078: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
1079: $params->{'isNewBranch'} = 0;
1.51 bowersj2 1080: }
1081:
1.133 bowersj2 1082: # links to open and close the folder
1083: my $linkopen = "<a href='$link'>";
1084: my $linkclose = "</a>";
1.51 bowersj2 1085:
1.133 bowersj2 1086: # Default icon: HTML page
1087: my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
1088:
1089: if ($resource->is_problem()) {
1090: if ($part eq "0" || $params->{'condensed'}) {
1091: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
1092: } else {
1093: $icon = $params->{'indentString'};
1094: }
1095: }
1.51 bowersj2 1096:
1.133 bowersj2 1097: # Display the correct map icon to open or shut map
1098: if ($resource->is_map()) {
1099: my $mapId = $resource->map_pc();
1100: my $nowOpen = !defined($filter->{$mapId});
1101: if ($it->{CONDITION}) {
1102: $nowOpen = !$nowOpen;
1103: }
1104: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
1105: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
1106:
1107: $linkopen = "<a href='" . $params->{'url'} . '?' .
1108: $params->{'queryString'} . '&filter=';
1109: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1110: addToFilter($filter, $mapId) :
1111: removeFromFilter($filter, $mapId);
1112: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1113: . $params->{'hereType'} . '&here=' .
1114: &Apache::lonnet::escape($params->{'here'}) .
1115: '&jumpType=' . SYMB() . '&jump=' .
1116: &Apache::lonnet::escape($params->{$resource->symb()}) . "'>";
1117: }
1.51 bowersj2 1118:
1.133 bowersj2 1119: if ($resource->randomout()) {
1120: $nonLinkedText .= ' <i>(hidden)</i> ';
1121: }
1122:
1123: # We're done preparing and finally ready to start the rendering
1124: my $result = "<td align='left' valign='center'>";
1125:
1126: # print indentation
1127: for (my $i = 0; $i < $params->{'indentLevel'} -
1128: $params->{'deltaLevel'}; $i++) {
1129: $result .= $params->{'indentString'};
1.84 bowersj2 1130: }
1131:
1.133 bowersj2 1132: # Decide what to display
1133: $result .= "$newBranchText$linkopen$icon$linkclose";
1134:
1135: my $curMarkerBegin = '';
1136: my $curMarkerEnd = '';
1.51 bowersj2 1137:
1.133 bowersj2 1138: # Is this the current resource?
1139: if (!$params->{'displayedHereMarker'} &&
1140: (($params->{'hereType'} == SYMB() &&
1141: $resource->symb() eq $params->{'here'}) ||
1142: ($params->{'hereType'} == URL() &&
1143: $resource->src() eq $params->{'here'}))) {
1144: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1145: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1.51 bowersj2 1146: }
1147:
1.133 bowersj2 1148: if ($resource->is_problem() && $part ne "0" &&
1149: !$params->{'condensed'}) {
1150: $partLabel = " (Part $part)";
1151: $title = "";
1.51 bowersj2 1152: }
1153:
1.133 bowersj2 1154: if ($params->{'multipart'} && $params->{'condensed'}) {
1155: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51 bowersj2 1156: }
1157:
1.134 bowersj2 1158: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1.51 bowersj2 1159:
1.133 bowersj2 1160: return $result;
1161: }
1.51 bowersj2 1162:
1.133 bowersj2 1163: sub render_communication_status {
1164: my ($resource, $part, $params) = @_;
1.134 bowersj2 1165: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1166:
1167: my $link = $params->{"resourceLink"};
1168: my $linkopen = "<a href='$link'>";
1169: my $linkclose = "</a>";
1170:
1171: if ($resource->hasDiscussion()) {
1172: $discussionHTML = $linkopen .
1173: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
1174: $linkclose;
1175: }
1176:
1177: if ($resource->getFeedback()) {
1178: my $feedback = $resource->getFeedback();
1179: foreach (split(/\,/, $feedback)) {
1180: if ($_) {
1181: $feedbackHTML .= ' <a href="/adm/email?display='
1182: . &Apache::lonnet::escape($_) . '">'
1183: . '<img src="/adm/lonMisc/feedback.gif" '
1184: . 'border="0" /></a>';
1185: }
1186: }
1187: }
1188:
1189: if ($resource->getErrors()) {
1190: my $errors = $resource->getErrors();
1191: foreach (split(/,/, $errors)) {
1192: if ($_) {
1193: $errorHTML .= ' <a href="/adm/email?display='
1194: . &Apache::lonnet::escape($_) . '">'
1195: . '<img src="/adm/lonMisc/bomb.gif" '
1196: . 'border="0" /></a>';
1197: }
1198: }
1199: }
1200:
1201: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1202:
1.133 bowersj2 1203: }
1204: sub render_quick_status {
1205: my ($resource, $part, $params) = @_;
1.135 bowersj2 1206: my $result = "";
1207: my $firstDisplayed = !$params->{'condensed'} &&
1208: $params->{'multipart'} && $part eq "0";
1209:
1210: my $link = $params->{"resourceLink"};
1211: my $linkopen = "<a href='$link'>";
1212: my $linkclose = "</a>";
1213:
1214: if ($resource->is_problem() &&
1215: !$firstDisplayed) {
1216: my $icon = $statusIconMap{$resource->status($part)};
1217: my $alt = $iconAltTags{$icon};
1218: if ($icon) {
1219: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
1220: } else {
1221: $result .= "<td width='30'> </td>\n";
1222: }
1223: } else { # not problem, no icon
1224: $result .= "<td width='30'> </td>\n";
1225: }
1226:
1227: return $result;
1.133 bowersj2 1228: }
1229: sub render_long_status {
1230: my ($resource, $part, $params) = @_;
1.136 bowersj2 1231: my $result = "<td align='right' valign='center'>\n";
1232: my $firstDisplayed = !$params->{'condensed'} &&
1233: $params->{'multipart'} && $part eq "0";
1234:
1235: my $color;
1236: if ($resource->is_problem()) {
1237: $color = $colormap{$resource->status};
1238:
1239: if (dueInLessThen24Hours($resource, $part) ||
1240: lastTry($resource, $part)) {
1241: $color = $hurryUpColor;
1242: }
1243: }
1244:
1245: if ($resource->kind() eq "res" &&
1246: $resource->is_problem() &&
1247: !$firstDisplayed) {
1248: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1249: $result .= getDescription($resource, $part);
1250: if ($color) {$result .= "</b></font>"; }
1251: }
1252: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1253: $result .= '(randomly select ' . $resource->randompick() .')';
1254: }
1255:
1256: $result .= " </td>\n";
1257:
1258: return $result;
1.51 bowersj2 1259: }
1260:
1.133 bowersj2 1261: my @preparedColumns = (\&render_resource, \&render_communication_status,
1262: \&render_quick_status, \&render_long_status);
1.132 bowersj2 1263:
1264: sub setDefault {
1265: my ($val, $default) = @_;
1266: if (!defined($val)) { return $default; }
1267: return $val;
1268: }
1269:
1270: sub render {
1271: my $args = shift;
1272:
1273: # Configure the renderer.
1274: my $cols = $args->{'cols'};
1275: if (!defined($cols)) {
1276: # no columns, no nav maps.
1277: return '';
1278: }
1279: my $it = $args->{'iterator'};
1280: if (!defined($it)) {
1281: # no iterator, no nav map.
1282: return '';
1283: }
1284:
1285: my $showParts = setDefault($args->{'showParts'}, 1);
1286: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1287: my $jumpToURL = $args->{'jumpToURL'};
1288: my $jumpToSymb = $args->{'jumpToSymb'};
1.133 bowersj2 1289: my $hereURL = $args->{'hereURL'};
1290: my $hereSymb = $args->{'hereSymb'};
1291:
1292: #if (defined($jumpToURL)) {
1293: # $args->{'jumpType'} =
1294:
1.132 bowersj2 1295: # End parameter setting
1.133 bowersj2 1296:
1.132 bowersj2 1297: # Data
1298: my $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1299: my $res = "Apache::lonnavmaps::resource";
1300: my %condenseStatuses =
1301: ( $res->NETWORK_FAILURE => 1,
1302: $res->NOTHING_SET => 1,
1303: $res->CORRECT => 1 );
1304: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133 bowersj2 1305: my $currentJumpIndex = 0; # keeps track of when the current resource is found,
1306: # so we can back up a few and put the anchor above the
1307: # current resource
1308: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1309: # before the current resource when using #current
1310:
1311: # Shared variables
1312: $args->{'counter'} = 0; # counts the rows
1313: $args->{'indentLevel'} = 0;
1314: $args->{'isNewBranch'} = 0;
1315: $args->{'condensed'} = 0;
1316: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1317: $args->{'displayedHereMarker'} = 0;
1.132 bowersj2 1318:
1.133 bowersj2 1319: my $displayedJumpMarker = 0;
1.132 bowersj2 1320: # Set up iteration.
1321: my $depth = 1;
1322: $it->next(); # discard initial BEGIN_MAP
1323: my $curRes = $it->next();
1324: my $now = time();
1325: my $in24Hours = $now + 24 * 60 * 60;
1326: my $rownum = 0;
1327:
1328: while ($depth > 0) {
1329: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1330: if ($curRes == $it->END_MAP()) { $depth--; }
1331:
1332: # Maintain indentation level.
1333: if ($curRes == $it->BEGIN_MAP() ||
1334: $curRes == $it->BEGIN_BRANCH() ) {
1.133 bowersj2 1335: $args->{'indentLevel'}++;
1.132 bowersj2 1336: }
1337: if ($curRes == $it->END_MAP() ||
1338: $curRes == $it->END_BRANCH() ) {
1.133 bowersj2 1339: $args->{'indentLevel'}--;
1.132 bowersj2 1340: }
1341: # Notice new branches
1342: if ($curRes == $it->BEGIN_BRANCH()) {
1.133 bowersj2 1343: $args->{'isNewBranch'} = 1;
1344: }
1345:
1346: # If this isn't an actual resource, continue on
1347: if (!ref($curRes)) {
1348: $curRes = $it->next();
1349: next;
1.132 bowersj2 1350: }
1.133 bowersj2 1351:
1352: $args->{'counter'}++;
1353: # reserve space for branch symbol
1354: $args->{'deltalevel'} = $args->{'isNewBranch'}? 1 : 0;
1355: if ($args->{'indentLevel'} - $args->{'deltalevel'} < 0) {
1.132 bowersj2 1356: # If this would be at a negative depth (top-level maps in
1357: # new-style courses, we want to suppress their title display)
1358: # then ignore it.
1359: $curRes = $it->next();
1360: next;
1361: }
1362:
1363: # Does it have multiple parts?
1.133 bowersj2 1364: $args->{'multipart'} = 0;
1365: $args->{'condensed'} = 0;
1.132 bowersj2 1366: my @parts;
1367:
1368: # Decide what parts to show.
1.133 bowersj2 1369: if ($curRes->is_problem() && $showParts) {
1.132 bowersj2 1370: @parts = @{$curRes->parts()};
1.133 bowersj2 1371: $args->{'multipart'} = scalar(@parts) > 1;
1.132 bowersj2 1372:
1373: if ($condenseParts) { # do the condensation
1374: if (!$curRes->opendate("0")) {
1375: @parts = ("0");
1.133 bowersj2 1376: $args->{'condensed'} = 1;
1.132 bowersj2 1377: }
1.133 bowersj2 1378: if (!$args->{'condensed'}) {
1.132 bowersj2 1379: # Decide whether to condense based on similarity
1380: my $status = $curRes->status($parts[1]);
1381: my $due = $curRes->duedate($parts[1]);
1382: my $open = $curRes->opendate($parts[1]);
1383: my $statusAllSame = 1;
1384: my $dueAllSame = 1;
1385: my $openAllSame = 1;
1386: for (my $i = 2; $i < scalar(@parts); $i++) {
1387: if ($curRes->status($parts[$i]) != $status){
1388: $statusAllSame = 0;
1389: }
1390: if ($curRes->duedate($parts[$i]) != $due ) {
1391: $dueAllSame = 0;
1392: }
1393: if ($curRes->opendate($parts[$i]) != $open) {
1394: $openAllSame = 0;
1395: }
1396: }
1397: # $*allSame is true if all the statuses were
1398: # the same. Now, if they are all the same and
1399: # match one of the statuses to condense, or they
1400: # are all open with the same due date, or they are
1401: # all OPEN_LATER with the same open date, display the
1402: # status of the first non-zero part (to get the 'correct'
1403: # status right, since 0 is never 'correct' or 'open').
1404: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1405: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1406: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1407: @parts = ($parts[1]);
1.133 bowersj2 1408: $args->{'condensed'} = 1;
1.132 bowersj2 1409: }
1410:
1411: }
1412: }
1413:
1414: } else {
1415: # Not showing parts
1416: @parts = ("0"); # show main part only
1417: }
1418:
1419: # If the multipart problem was condensed, "forget" it was multipart
1420: if (scalar(@parts) == 1) {
1.133 bowersj2 1421: $args->{'multipart'} = 0;
1.132 bowersj2 1422: }
1423:
1424: # In the event of a network error, display one part.
1425: # If this is a single part, we can at least show the correct
1426: # status, but if it's multipart, we're lost, since we can't
1427: # retreive the metadata to count the parts
1428: if ($curRes->{RESOURCE_ERROR}) {
1429: @parts = ("0");
1430: }
1431:
1432: # Now, we've decided what parts to show. Loop through them and
1433: # show them.
1434: foreach my $part (@parts) {
1435: $rownum ++;
1436: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1437:
1438: $result .= " <tr bgcolor='$backgroundColor'>\n";
1.134 bowersj2 1439:
1440: # Set up some data about the parts that the cols might want
1441: my $filter = $it->{FILTER};
1442: my $stack = $it->getStack();
1443: my $src = getLinkForResource($stack);
1444:
1445: my $srcHasQuestion = $src =~ /\?/;
1446: $args->{"resourceLink"} = $src.
1447: ($srcHasQuestion?'&':'?') .
1.137 ! bowersj2 1448: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1.132 bowersj2 1449:
1450: # Now, display each column.
1451: foreach my $col (@$cols) {
1452:
1.133 bowersj2 1453: # If this is the first column and it's time to print
1454: # the anchor, do so
1455: if ($col == $cols->[0] &&
1456: $args->{'counter'} == $args->{'currentJumpIndex'} -
1457: $args->{'currentJumpDelta'}) {
1458: $result .= '<a name="curloc" />';
1459: $displayedJumpMarker = 1;
1460: }
1461:
1462:
1463: if (ref($col)) {
1464: $result .= &$col($curRes, $part, $args);
1465: } else {
1466: $result .= &{$preparedColumns[$col]}($curRes, $part, $args);
1467: }
1.132 bowersj2 1468:
1469: }
1470:
1471: $result .= " </tr>\n";
1472: }
1473:
1474:
1475: $curRes = $it->next();
1476: }
1477:
1.134 bowersj2 1478: # Print out the part that jumps to #curloc if it exists
1479: if ($args->{"displayedJumpMarker"}) {
1480: $result .= "<script>location += "#curloc";</script>\n";
1481: }
1482:
1.132 bowersj2 1483: $result .= "</table>";
1484:
1485: return $result;
1486: }
1487:
1.133 bowersj2 1488: 1;
1489:
1490: package Apache::lonnavmaps::navmap;
1491:
1492: =pod
1493:
1494: lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, the Apache handler for the "Navigation Map" button, and a flexible prepared renderer for navigation maps that are easy to use anywhere.
1495:
1496: =head1 navmap object: Encapsulating the compiled nav map
1497:
1498: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
1499:
1500: 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.
1501:
1502: You must obtain resource objects through the navmap object.
1503:
1504: =head2 Methods
1505:
1506: =over 4
1507:
1508: =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.
1509:
1510: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
1511:
1512: =cut
1513:
1514: use strict;
1515: use GDBM_File;
1516:
1517: sub new {
1518: # magic invocation to create a class instance
1519: my $proto = shift;
1520: my $class = ref($proto) || $proto;
1521: my $self = {};
1522:
1523: $self->{NAV_HASH_FILE} = shift;
1524: $self->{PARM_HASH_FILE} = shift;
1525: $self->{GENERATE_COURSE_USER_OPT} = shift;
1526: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1527:
1528: # Resource cache stores navmap resources as we reference them. We generate
1529: # them on-demand so we don't pay for creating resources unless we use them.
1530: $self->{RESOURCE_CACHE} = {};
1531:
1532: # Network failure flag, if we accessed the course or user opt and
1533: # failed
1534: $self->{NETWORK_FAILURE} = 0;
1535:
1536: # tie the nav hash
1537:
1538: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1539: &GDBM_READER(), 0640))) {
1540: return undef;
1541: }
1542:
1543: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1544: &GDBM_READER(), 0640)))
1545: {
1546: untie $self->{PARM_HASH};
1547: return undef;
1548: }
1549:
1550: $self->{HASH_TIED} = 1;
1551: $self->{NAV_HASH} = \%navmaphash;
1552: $self->{PARM_HASH} = \%parmhash;
1553:
1554: bless($self);
1555:
1556: return $self;
1557: }
1558:
1559: sub init {
1560: my $self = shift;
1561:
1562: # If the course opt hash and the user opt hash should be generated,
1563: # generate them
1564: if ($self->{GENERATE_COURSE_USER_OPT}) {
1565: my $uname=$ENV{'user.name'};
1566: my $udom=$ENV{'user.domain'};
1567: my $uhome=$ENV{'user.home'};
1568: my $cid=$ENV{'request.course.id'};
1569: my $chome=$ENV{'course.'.$cid.'.home'};
1570: my ($cdom,$cnum)=split(/\_/,$cid);
1571:
1572: my $userprefix=$uname.'_'.$udom.'_';
1573:
1574: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1575: unless ($uhome eq 'no_host') {
1576: # ------------------------------------------------- Get coursedata (if present)
1577: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1578: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1579: ':resourcedata',$chome);
1580: if ($reply!~/^error\:/) {
1581: $courserdatas{$cid}=$reply;
1582: $courserdatas{$cid.'.last_cache'}=time;
1583: }
1584: # check to see if network failed
1585: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1586: {
1587: $self->{NETWORK_FAILURE} = 1;
1588: }
1589: }
1590: foreach (split(/\&/,$courserdatas{$cid})) {
1591: my ($name,$value)=split(/\=/,$_);
1592: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1593: &Apache::lonnet::unescape($value);
1594: }
1595: # --------------------------------------------------- Get userdata (if present)
1596: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1597: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1598: if ($reply!~/^error\:/) {
1599: $userrdatas{$uname.'___'.$udom}=$reply;
1600: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1601: }
1602: # check to see if network failed
1603: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1604: {
1605: $self->{NETWORK_FAILURE} = 1;
1606: }
1607: }
1608: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1609: my ($name,$value)=split(/\=/,$_);
1610: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1611: &Apache::lonnet::unescape($value);
1612: }
1613: $self->{COURSE_OPT} = \%courseopt;
1614: $self->{USER_OPT} = \%useropt;
1615: }
1616: }
1617:
1618: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1619: my $cid=$ENV{'request.course.id'};
1620: my ($cdom,$cnum)=split(/\_/,$cid);
1621:
1622: my %emailstatus = &Apache::lonnet::dump('email_status');
1623: my $logoutTime = $emailstatus{'logout'};
1624: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1625: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1626: $courseLeaveTime : $logoutTime);
1627: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1628: $cdom, $cnum);
1629: my %feedback=();
1630: my %error=();
1631: my $keys = &Apache::lonnet::reply('keys:'.
1632: $ENV{'user.domain'}.':'.
1633: $ENV{'user.name'}.':nohist_email',
1634: $ENV{'user.home'});
1635:
1636: foreach my $msgid (split(/\&/, $keys)) {
1637: $msgid=&Apache::lonnet::unescape($msgid);
1638: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1639: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1640: my ($what,$url)=($1,$2);
1641: my %status=
1642: &Apache::lonnet::get('email_status',[$msgid]);
1643: if ($status{$msgid}=~/^error\:/) {
1644: $status{$msgid}='';
1645: }
1646:
1647: if (($status{$msgid} eq 'new') ||
1648: (!$status{$msgid})) {
1649: if ($what eq 'Error') {
1650: $error{$url}.=','.$msgid;
1651: } else {
1652: $feedback{$url}.=','.$msgid;
1653: }
1654: }
1655: }
1656: }
1657:
1658: $self->{FEEDBACK} = \%feedback;
1659: $self->{ERROR_MSG} = \%error; # what is this? JB
1660: $self->{DISCUSSION_TIME} = \%discussiontime;
1661: $self->{EMAIL_STATUS} = \%emailstatus;
1662:
1663: }
1664:
1665: $self->{PARM_CACHE} = {};
1666: }
1667:
1668: # Internal function: Takes a key to look up in the nav hash and implements internal
1669: # memory caching of that key.
1670: sub navhash {
1671: my $self = shift; my $key = shift;
1672: return $self->{NAV_HASH}->{$key};
1673: }
1674:
1675: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1676: sub courseMapDefined {
1677: my $self = shift;
1678: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1679:
1680: my $firstres = $self->navhash("map_start_$uri");
1681: my $lastres = $self->navhash("map_finish_$uri");
1682: return $firstres && $lastres;
1683: }
1684:
1685: sub getIterator {
1686: my $self = shift;
1687: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1688: shift, undef, shift);
1689: return $iterator;
1690: }
1691:
1692: # unties the hash when done
1693: sub untieHashes {
1694: my $self = shift;
1695: untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
1696: untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
1697: $self->{HASH_TIED} = 0;
1698: }
1699:
1700: # when the object is destroyed, be sure to untie all the hashes we tied.
1701: sub DESTROY {
1702: my $self = shift;
1703: $self->untieHashes();
1704: }
1705:
1706: # Private method: Does the given resource (as a symb string) have
1707: # current discussion? Returns 0 if chat/mail data not extracted.
1708: sub hasDiscussion {
1709: my $self = shift;
1710: my $symb = shift;
1711: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1712:
1713: #return defined($self->{DISCUSSION_TIME}->{$symb});
1714: return $self->{DISCUSSION_TIME}->{$symb} >
1715: $self->{LAST_CHECK};
1716: }
1717:
1718: # Private method: Does the given resource (as a symb string) have
1719: # current feedback? Returns the string in the feedback hash, which
1720: # will be false if it does not exist.
1721: sub getFeedback {
1722: my $self = shift;
1723: my $symb = shift;
1724:
1725: if (!defined($self->{FEEDBACK})) { return ""; }
1726:
1727: return $self->{FEEDBACK}->{$symb};
1728: }
1729:
1730: # Private method: Get the errors for that resource (by source).
1731: sub getErrors {
1732: my $self = shift;
1733: my $src = shift;
1734:
1735: if (!defined($self->{ERROR_MSG})) { return ""; }
1736: return $self->{ERROR_MSG}->{$src};
1737: }
1738:
1739: =pod
1740:
1741: =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.
1742:
1743: =cut
1744:
1745: # The strategy here is to cache the resource objects, and only construct them
1746: # as we use them. The real point is to prevent reading any more from the tied
1747: # hash then we have to, which should hopefully alleviate speed problems.
1748: # Caching is just an incidental detail I throw in because it makes sense.
1749:
1750: sub getById {
1751: my $self = shift;
1752: my $id = shift;
1753:
1754: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1755: {
1756: return $self->{RESOURCE_CACHE}->{$id};
1757: }
1758:
1759: # resource handles inserting itself into cache.
1760: # Not clear why the quotes are necessary, but as of this
1761: # writing it doesn't work without them.
1762: return "Apache::lonnavmaps::resource"->new($self, $id);
1.132 bowersj2 1763: }
1.133 bowersj2 1764:
1765: =pod
1766:
1767: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
1768:
1769: =cut
1770:
1771: sub firstResource {
1772: my $self = shift;
1773: my $firstResource = $self->navhash('map_start_' .
1774: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1775: return $self->getById($firstResource);
1.132 bowersj2 1776: }
1.133 bowersj2 1777:
1778: =pod
1779:
1780: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
1781:
1782: =cut
1783:
1784: sub finishResource {
1785: my $self = shift;
1786: my $firstResource = $self->navhash('map_finish_' .
1787: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1788: return $self->getById($firstResource);
1.132 bowersj2 1789: }
1.133 bowersj2 1790:
1791: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1792: # the actual lookup; parmval caches the results.
1793: sub parmval {
1794: my $self = shift;
1795: my ($what,$symb)=@_;
1796: my $hashkey = $what."|||".$symb;
1797:
1798: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1799: return $self->{PARM_CACHE}->{$hashkey};
1800: }
1801:
1802: my $result = $self->parmval_real($what, $symb);
1803: $self->{PARM_CACHE}->{$hashkey} = $result;
1804: return $result;
1.132 bowersj2 1805: }
1806:
1.133 bowersj2 1807: sub parmval_real {
1808: my $self = shift;
1809: my ($what,$symb) = @_;
1810:
1811: my $cid=$ENV{'request.course.id'};
1812: my $csec=$ENV{'request.course.sec'};
1813: my $uname=$ENV{'user.name'};
1814: my $udom=$ENV{'user.domain'};
1815:
1816: unless ($symb) { return ''; }
1817: my $result='';
1818:
1819: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1820:
1821: # ----------------------------------------------------- Cascading lookup scheme
1822: my $rwhat=$what;
1823: $what=~s/^parameter\_//;
1824: $what=~s/\_/\./;
1825:
1826: my $symbparm=$symb.'.'.$what;
1827: my $mapparm=$mapname.'___(all).'.$what;
1828: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1829:
1830: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1831: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1832: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1833:
1834: my $courselevel= $usercourseprefix.'.'.$what;
1835: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1836: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1837:
1838: my $useropt = $self->{USER_OPT};
1839: my $courseopt = $self->{COURSE_OPT};
1840: my $parmhash = $self->{PARM_HASH};
1841:
1842: # ---------------------------------------------------------- first, check user
1843: if ($uname and defined($useropt)) {
1844: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1845: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1846: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1847: }
1848:
1849: # ------------------------------------------------------- second, check course
1850: if ($csec and defined($courseopt)) {
1851: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1852: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1853: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1854: }
1855:
1856: if (defined($courseopt)) {
1857: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1858: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1859: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1860: }
1861:
1862: # ----------------------------------------------------- third, check map parms
1863:
1864: my $thisparm=$$parmhash{$symbparm};
1865: if (defined($thisparm)) { return $thisparm; }
1866:
1867: # ----------------------------------------------------- fourth , check default
1868:
1869: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1870: if (defined($default)) { return $default}
1871:
1872: # --------------------------------------------------- fifth , cascade up parts
1873:
1874: my ($space,@qualifier)=split(/\./,$rwhat);
1875: my $qualifier=join('.',@qualifier);
1876: unless ($space eq '0') {
1877: my ($part,$id)=split(/\_/,$space);
1878: if ($id) {
1879: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1880: if (defined($partgeneral)) { return $partgeneral; }
1881: } else {
1882: my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
1883: if (defined($resourcegeneral)) { return $resourcegeneral; }
1884: }
1885: }
1886: return '';
1887: }
1.51 bowersj2 1888:
1889: 1;
1890:
1891: package Apache::lonnavmaps::iterator;
1892:
1893: =pod
1894:
1895: =back
1896:
1897: =head1 navmap Iterator
1898:
1899: 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.
1900:
1901: 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:
1902:
1903: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1904:
1905: To get the next thing from the iterator, call B<next>:
1906:
1907: C<my $nextThing = $resourceIterator-E<gt>next()>
1908:
1909: getIterator behaves as follows:
1910:
1911: =over 4
1912:
1.116 bowersj2 1913: =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 1914:
1.101 bowersj2 1915: 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 1916:
1917: 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:
1918:
1919: =over 4
1920:
1.70 bowersj2 1921: =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
1922:
1923: =item * END_MAP: The map is now done.
1924:
1925: =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
1926:
1927: =item * END_BRANCH: The branch is now done.
1.51 bowersj2 1928:
1929: =back
1930:
1.70 bowersj2 1931: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
1932:
1.116 bowersj2 1933: 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.
1934:
1.70 bowersj2 1935: =back
1.51 bowersj2 1936:
1937: =cut
1938:
1939: # Here are the tokens for the iterator:
1940:
1941: sub BEGIN_MAP { return 1; } # begining of a new map
1942: sub END_MAP { return 2; } # end of the map
1943: sub BEGIN_BRANCH { return 3; } # beginning of a branch
1944: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 1945: sub FORWARD { return 1; } # go forward
1946: sub BACKWARD { return 2; }
1.51 bowersj2 1947:
1.96 bowersj2 1948: sub min {
1949: (my $a, my $b) = @_;
1950: if ($a < $b) { return $a; } else { return $b; }
1951: }
1952:
1.107 bowersj2 1953: # In the CVS repository, documentation of this algorithm is included
1954: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
1955: # will reference the same location in the text as the part of the
1956: # algorithm is running through.
1957:
1.94 bowersj2 1958: sub new {
1959: # magic invocation to create a class instance
1960: my $proto = shift;
1961: my $class = ref($proto) || $proto;
1962: my $self = {};
1963:
1964: $self->{NAV_MAP} = shift;
1965: return undef unless ($self->{NAV_MAP});
1966:
1967: # Handle the parameters
1968: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1969: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1970:
1971: # If the given resources are just the ID of the resource, get the
1972: # objects
1973: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1974: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1975: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1976: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1977:
1978: $self->{FILTER} = shift;
1979:
1980: # A hash, used as a set, of resource already seen
1981: $self->{ALREADY_SEEN} = shift;
1982: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1983: $self->{CONDITION} = shift;
1984:
1.116 bowersj2 1985: # Do we want to automatically follow "redirection" maps?
1986: $self->{FORCE_TOP} = shift;
1987:
1.94 bowersj2 1988: # Now, we need to pre-process the map, by walking forward and backward
1989: # over the parts of the map we're going to look at.
1.96 bowersj2 1990:
1.97 bowersj2 1991: # The processing steps are exactly the same, except for a few small
1992: # changes, so I bundle those up in the following list of two elements:
1993: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
1994: # first_resource).
1995: # This prevents writing nearly-identical code twice.
1996: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
1997: 'FIRST_RESOURCE'],
1998: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
1999: 'FINISH_RESOURCE'] );
2000:
1.98 bowersj2 2001: my $maxDepth = 0; # tracks max depth
2002:
1.116 bowersj2 2003: # If there is only one resource in this map, and it's a map, we
2004: # want to remember that, so the user can ask for the first map
2005: # that isn't just a redirector.
2006: my $resource; my $resourceCount = 0;
2007:
1.107 bowersj2 2008: # **1**
2009:
1.97 bowersj2 2010: foreach my $pass (@iterations) {
2011: my $direction = $pass->[0];
2012: my $valName = $pass->[1];
2013: my $nextResourceMethod = $pass->[2];
2014: my $firstResourceName = $pass->[3];
2015:
2016: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2017: $self->{FIRST_RESOURCE},
2018: $self->{FINISH_RESOURCE},
2019: {}, undef, 0, $direction);
1.96 bowersj2 2020:
1.97 bowersj2 2021: # prime the recursion
2022: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 bowersj2 2023: my $depth = 0;
1.97 bowersj2 2024: $iterator->next();
2025: my $curRes = $iterator->next();
1.98 bowersj2 2026: while ($depth > -1) {
1.97 bowersj2 2027: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2028: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 2029:
1.97 bowersj2 2030: if (ref($curRes)) {
1.116 bowersj2 2031: # If there's only one resource, this will save it
1.117 bowersj2 2032: # we have to filter empty resources from consideration here,
2033: # or even "empty", redirecting maps have two (start & finish)
2034: # or three (start, finish, plus redirector)
2035: if($direction == FORWARD && $curRes->src()) {
2036: $resource = $curRes; $resourceCount++;
2037: }
1.97 bowersj2 2038: my $resultingVal = $curRes->{DATA}->{$valName};
2039: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 2040: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 2041:
1.116 bowersj2 2042: if ($nextCount == 1) { # **3**
1.97 bowersj2 2043: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2044: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2045: }
2046:
1.116 bowersj2 2047: if ($nextCount > 1) { # **4**
1.97 bowersj2 2048: foreach my $res (@{$nextResources}) {
2049: my $current = $res->{DATA}->{$valName} || 999999999;
2050: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2051: }
2052: }
2053: }
1.96 bowersj2 2054:
1.107 bowersj2 2055: # Assign the final val (**2**)
1.97 bowersj2 2056: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 2057: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2058: $curRes->{DATA}->{BOT_UP_VAL});
2059:
2060: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2061: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2062: }
1.97 bowersj2 2063: $curRes = $iterator->next();
1.96 bowersj2 2064: }
2065: }
1.94 bowersj2 2066:
1.116 bowersj2 2067: # Check: Was this only one resource, a map?
2068: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2069: my $firstResource = $resource->map_start();
2070: my $finishResource = $resource->map_finish();
2071: return
2072: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2073: $finishResource, $self->{FILTER},
2074: $self->{ALREADY_SEEN},
2075: $self->{CONDITION}, 0);
2076:
2077: }
2078:
1.98 bowersj2 2079: # Set up some bookkeeping information.
2080: $self->{CURRENT_DEPTH} = 0;
2081: $self->{MAX_DEPTH} = $maxDepth;
2082: $self->{STACK} = [];
2083: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2084:
2085: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2086: push @{$self->{STACK}}, [];
2087: }
2088:
1.107 bowersj2 2089: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 2090: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2091: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2092:
2093: bless ($self);
2094:
2095: return $self;
2096: }
2097:
2098: sub next {
2099: my $self = shift;
2100:
2101: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2102: # grab the next from the recursive iterator
2103: my $next = $self->{RECURSIVE_ITERATOR}->next();
2104:
2105: # is it a begin or end map? If so, update the depth
2106: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2107: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2108:
2109: # Are we back at depth 0? If so, stop recursing
2110: if ($self->{RECURSIVE_DEPTH} == 0) {
2111: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2112: }
2113:
2114: return $next;
2115: }
2116:
2117: if (defined($self->{FORCE_NEXT})) {
2118: my $tmp = $self->{FORCE_NEXT};
2119: $self->{FORCE_NEXT} = undef;
2120: return $tmp;
2121: }
2122:
2123: # Have we not yet begun? If not, return BEGIN_MAP and
2124: # remember we've started.
2125: if ( !$self->{STARTED} ) {
2126: $self->{STARTED} = 1;
2127: return $self->BEGIN_MAP();
2128: }
2129:
2130: # Here's the guts of the iterator.
2131:
2132: # Find the next resource, if any.
2133: my $found = 0;
2134: my $i = $self->{MAX_DEPTH};
2135: my $newDepth;
2136: my $here;
2137: while ( $i >= 0 && !$found ) {
1.107 bowersj2 2138: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2139: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 2140: $found = 1;
2141: $newDepth = $i;
2142: }
2143: $i--;
2144: }
2145:
2146: # If we still didn't find anything, we're done.
2147: if ( !$found ) {
2148: # We need to get back down to the correct branch depth
2149: if ( $self->{CURRENT_DEPTH} > 0 ) {
2150: $self->{CURRENT_DEPTH}--;
2151: return END_BRANCH();
2152: } else {
2153: return END_MAP();
2154: }
2155: }
2156:
1.104 bowersj2 2157: # If this is not a resource, it must be an END_BRANCH marker we want
2158: # to return directly.
1.107 bowersj2 2159: if (!ref($here)) { # **8**
1.104 bowersj2 2160: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2161: $self->{CURRENT_DEPTH}--;
2162: return $here;
2163: }
2164: }
2165:
2166: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2167: $self->{HERE} = $here;
2168:
1.98 bowersj2 2169: # Get to the right level
2170: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2171: push @{$self->{STACK}->[$newDepth]}, $here;
2172: $self->{CURRENT_DEPTH}--;
2173: return END_BRANCH();
2174: }
2175: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2176: push @{$self->{STACK}->[$newDepth]}, $here;
2177: $self->{CURRENT_DEPTH}++;
2178: return BEGIN_BRANCH();
2179: }
2180:
2181: # If we made it here, we have the next resource, and we're at the
2182: # right branch level. So let's examine the resource for where
2183: # we can get to from here.
2184:
2185: # So we need to look at all the resources we can get to from here,
2186: # categorize them if we haven't seen them, remember if we have a new
2187: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 2188: my $maxDepthAdded = -1;
2189:
1.98 bowersj2 2190: for (@$nextUnfiltered) {
2191: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 2192: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2193: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 2194: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 2195: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 2196: }
2197: }
1.104 bowersj2 2198:
2199: # Is this the end of a branch? If so, all of the resources examined above
2200: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2201: # marker onto the stack so we don't forget.
2202: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2203: # BC branch and gets to C, it will see F as the only next resource, but it's
2204: # one level lower. Thus, this is the end of the branch, since there are no
2205: # more resources added to this level or above.
1.111 bowersj2 2206: # We don't do this if the examined resource is the finish resource,
2207: # because the condition given above is true, but the "END_MAP" will
2208: # take care of things and we should already be at depth 0.
1.104 bowersj2 2209: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 2210: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 2211: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2212: }
2213:
1.98 bowersj2 2214: # That ends the main iterator logic. Now, do we want to recurse
2215: # down this map (if this resource is a map)?
2216: if ($self->{HERE}->is_map() &&
2217: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2218: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2219: my $firstResource = $self->{HERE}->map_start();
2220: my $finishResource = $self->{HERE}->map_finish();
2221:
2222: $self->{RECURSIVE_ITERATOR} =
2223: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2224: $finishResource, $self->{FILTER},
2225: $self->{ALREADY_SEEN}, $self->{CONDITION});
2226: }
2227:
1.116 bowersj2 2228: # If this is a blank resource, don't actually return it.
1.117 bowersj2 2229: # Should you ever find you need it, make sure to add an option to the code
2230: # that you can use; other things depend on this behavior.
1.131 bowersj2 2231: if (!$self->{HERE}->src() || !$self->{HERE}->browsePriv()) {
1.116 bowersj2 2232: return $self->next();
2233: }
2234:
1.98 bowersj2 2235: return $self->{HERE};
2236:
2237: }
2238:
2239: =pod
2240:
2241: 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).
2242:
2243: =cut
2244:
2245: sub getStack {
2246: my $self=shift;
2247:
2248: my @stack;
2249:
2250: $self->populateStack(\@stack);
2251:
2252: return \@stack;
2253: }
2254:
2255: # Private method: Calls the iterators recursively to populate the stack.
2256: sub populateStack {
2257: my $self=shift;
2258: my $stack = shift;
2259:
2260: push @$stack, $self->{HERE} if ($self->{HERE});
2261:
2262: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2263: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2264: }
1.94 bowersj2 2265: }
2266:
2267: 1;
2268:
2269: package Apache::lonnavmaps::DFSiterator;
2270:
1.100 bowersj2 2271: # Not documented in the perldoc: This is a simple iterator that just walks
2272: # through the nav map and presents the resources in a depth-first search
2273: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2274: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2275: # useful for pre-processing of some kind, and is in fact used by the main
2276: # iterator that way, but that's about it.
2277: # One could imagine merging this into the init routine of the main iterator,
2278: # but this might as well be left seperate, since it is possible some other
2279: # use might be found for it. - Jeremy
1.94 bowersj2 2280:
1.117 bowersj2 2281: # Unlike the main iterator, this DOES return all resources, even blank ones.
2282: # The main iterator needs them to correctly preprocess the map.
2283:
1.94 bowersj2 2284: sub BEGIN_MAP { return 1; } # begining of a new map
2285: sub END_MAP { return 2; } # end of the map
2286: sub FORWARD { return 1; } # go forward
2287: sub BACKWARD { return 2; }
2288:
1.100 bowersj2 2289: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2290: # filter hash ref (or undef), already seen hash or undef, condition
2291: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 2292: sub new {
2293: # magic invocation to create a class instance
2294: my $proto = shift;
2295: my $class = ref($proto) || $proto;
2296: my $self = {};
2297:
2298: $self->{NAV_MAP} = shift;
2299: return undef unless ($self->{NAV_MAP});
2300:
2301: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2302: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2303:
2304: # If the given resources are just the ID of the resource, get the
2305: # objects
2306: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2307: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2308: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2309: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2310:
2311: $self->{FILTER} = shift;
2312:
2313: # A hash, used as a set, of resource already seen
2314: $self->{ALREADY_SEEN} = shift;
2315: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 2316: $self->{CONDITION} = shift;
1.89 bowersj2 2317: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 2318:
1.100 bowersj2 2319: # Flag: Have we started yet?
1.51 bowersj2 2320: $self->{STARTED} = 0;
2321:
2322: # Should we continue calling the recursive iterator, if any?
2323: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2324: # The recursive iterator, if any
2325: $self->{RECURSIVE_ITERATOR} = undef;
2326: # Are we recursing on a map, or a branch?
2327: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2328: # And the count of how deep it is, so that this iterator can keep track of
2329: # when to pick back up again.
2330: $self->{RECURSIVE_DEPTH} = 0;
2331:
2332: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 2333: $self->{STACK} = [];
1.51 bowersj2 2334:
2335: # Start with the first resource
1.89 bowersj2 2336: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 2337: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 2338: } else {
1.100 bowersj2 2339: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 2340: }
1.51 bowersj2 2341:
2342: bless($self);
2343: return $self;
2344: }
2345:
2346: sub next {
2347: my $self = shift;
2348:
2349: # Are we using a recursive iterator? If so, pull from that and
2350: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 2351: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 2352: # grab the next from the recursive iterator
2353: my $next = $self->{RECURSIVE_ITERATOR}->next();
2354:
2355: # is it a begin or end map? Update depth if so
2356: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2357: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2358:
2359: # Are we back at depth 0? If so, stop recursing.
2360: if ($self->{RECURSIVE_DEPTH} == 0) {
2361: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2362: }
2363:
2364: return $next;
2365: }
2366:
2367: # Is there a current resource to grab? If not, then return
1.100 bowersj2 2368: # END_MAP, which will end the iterator.
2369: if (scalar(@{$self->{STACK}}) == 0) {
2370: return $self->END_MAP();
1.51 bowersj2 2371: }
2372:
2373: # Have we not yet begun? If not, return BEGIN_MAP and
2374: # remember that we've started.
2375: if ( !$self->{STARTED} ) {
2376: $self->{STARTED} = 1;
2377: return $self->BEGIN_MAP;
2378: }
2379:
2380: # Get the next resource in the branch
1.100 bowersj2 2381: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 2382:
1.100 bowersj2 2383: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 2384: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2385:
2386: # Get the next possible resources
1.90 bowersj2 2387: my $nextUnfiltered;
1.89 bowersj2 2388: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 2389: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 2390: } else {
1.90 bowersj2 2391: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 2392: }
1.51 bowersj2 2393: my $next = [];
2394:
2395: # filter the next possibilities to remove things we've
1.100 bowersj2 2396: # already seen.
1.51 bowersj2 2397: foreach (@$nextUnfiltered) {
1.52 bowersj2 2398: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2399: push @$next, $_;
2400: }
1.51 bowersj2 2401: }
2402:
2403: while (@$next) {
1.100 bowersj2 2404: # copy the next possibilities over to the stack
2405: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 2406: }
2407:
2408: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 2409: if ($self->{HERE}->is_map() &&
1.63 bowersj2 2410: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 2411: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2412: my $firstResource = $self->{HERE}->map_start();
2413: my $finishResource = $self->{HERE}->map_finish();
2414:
2415: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 2416: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 2417: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 2418: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 2419: }
2420:
2421: return $self->{HERE};
2422: }
2423:
1.1 www 2424: 1;
1.2 www 2425:
1.51 bowersj2 2426: package Apache::lonnavmaps::resource;
2427:
2428: use Apache::lonnet;
2429:
2430: =pod
2431:
2432: =head1 Object: resource
2433:
2434: A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
2435:
2436: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
2437:
2438: You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.
2439:
2440: =head2 Public Members
2441:
2442: resource objects have a hash called DATA ($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.
2443:
2444: =head2 Methods
2445:
2446: =over 4
2447:
1.70 bowersj2 2448: =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.
2449:
2450: =back
1.51 bowersj2 2451:
2452: =cut
2453:
2454: sub new {
2455: # magic invocation to create a class instance
2456: my $proto = shift;
2457: my $class = ref($proto) || $proto;
2458: my $self = {};
2459:
2460: $self->{NAV_MAP} = shift;
2461: $self->{ID} = shift;
2462:
2463: # Store this new resource in the parent nav map's cache.
2464: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 2465: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 2466:
2467: # A hash that can be used by two-pass algorithms to store data
2468: # about this resource in. Not used by the resource object
2469: # directly.
2470: $self->{DATA} = {};
2471:
2472: bless($self);
2473:
2474: return $self;
2475: }
2476:
1.70 bowersj2 2477: # private function: simplify the NAV_HASH lookups we keep doing
2478: # pass the name, and to automatically append my ID, pass a true val on the
2479: # second param
2480: sub navHash {
2481: my $self = shift;
2482: my $param = shift;
2483: my $id = shift;
1.115 bowersj2 2484: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 2485: }
2486:
1.51 bowersj2 2487: =pod
2488:
1.70 bowersj2 2489: B<Metadata Retreival>
2490:
1.101 bowersj2 2491: 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 2492:
2493: =over 4
2494:
1.106 bowersj2 2495: =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").
2496:
1.70 bowersj2 2497: =item * B<ext>: Returns true if the resource is external.
2498:
2499: =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
2500:
2501: =item * B<kind>: Returns the kind of the resource from the compiled nav map.
2502:
1.101 bowersj2 2503: =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 2504:
1.70 bowersj2 2505: =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
2506:
2507: =item * B<src>: Returns the source for the resource.
2508:
2509: =item * B<symb>: Returns the symb for the resource.
2510:
2511: =item * B<title>: Returns the title of the resource.
2512:
2513: =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 2514:
2515: =back
2516:
2517: =cut
2518:
2519: # These info functions can be used directly, as they don't return
2520: # resource information.
1.85 bowersj2 2521: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 2522: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 2523: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 2524: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2525: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 2526: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2527: sub randompick {
2528: my $self = shift;
2529: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2530: '.0.parameter_randompick'};
2531: }
1.51 bowersj2 2532: sub src {
2533: my $self=shift;
2534: return $self->navHash("src_", 1);
2535: }
2536: sub symb {
2537: my $self=shift;
2538: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2539: my $symbSrc = &Apache::lonnet::declutter($self->src());
2540: return &Apache::lonnet::declutter(
2541: $self->navHash('map_id_'.$first))
2542: . '___' . $second . '___' . $symbSrc;
2543: }
1.70 bowersj2 2544: sub title { my $self=shift; return $self->navHash("title_", 1); }
2545: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 2546: sub compTitle {
2547: my $self = shift;
2548: my $title = $self->title();
2549: if (!$title) {
2550: $title = $self->src();
2551: $title = substr($title, rindex($title, '/') + 1);
2552: }
2553: return $title;
2554: }
1.70 bowersj2 2555: =pod
2556:
2557: B<Predicate Testing the Resource>
2558:
2559: These methods are shortcuts to deciding if a given resource has a given property.
2560:
2561: =over 4
2562:
2563: =item * B<is_map>: Returns true if the resource is a map type.
2564:
2565: =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.)
2566:
2567: =item * B<is_page>: Returns true if the resource is a page.
2568:
2569: =item * B<is_problem>: Returns true if the resource is a problem.
2570:
1.101 bowersj2 2571: =item * B<is_sequence>: Returns true if the resource is a sequence.
1.70 bowersj2 2572:
2573: =back
2574:
2575: =cut
2576:
2577:
2578: sub is_html {
1.51 bowersj2 2579: my $self=shift;
2580: my $src = $self->src();
1.70 bowersj2 2581: return ($src =~ /html$/);
1.51 bowersj2 2582: }
1.70 bowersj2 2583: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2584: sub is_page {
1.51 bowersj2 2585: my $self=shift;
2586: my $src = $self->src();
1.70 bowersj2 2587: return ($src =~ /page$/);
1.51 bowersj2 2588: }
1.70 bowersj2 2589: sub is_problem {
1.51 bowersj2 2590: my $self=shift;
2591: my $src = $self->src();
1.70 bowersj2 2592: return ($src =~ /problem$/);
1.51 bowersj2 2593: }
1.70 bowersj2 2594: sub is_sequence {
1.51 bowersj2 2595: my $self=shift;
2596: my $src = $self->src();
1.70 bowersj2 2597: return ($src =~ /sequence$/);
1.51 bowersj2 2598: }
2599:
1.101 bowersj2 2600: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 2601: sub parmval {
2602: my $self = shift;
2603: my $what = shift;
2604: my $part = shift || "0";
2605: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2606: }
2607:
1.70 bowersj2 2608: =pod
2609:
2610: B<Map Methods>
2611:
2612: These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
2613:
2614: =over 4
2615:
2616: =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
2617:
2618: =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.
2619:
2620: =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
2621:
2622: =item * B<map_type>: Returns a string with the type of the map in it.
2623:
2624: =back
1.51 bowersj2 2625:
1.70 bowersj2 2626: =cut
1.51 bowersj2 2627:
2628: sub map_finish {
2629: my $self = shift;
2630: my $src = $self->src();
2631: my $res = $self->navHash("map_finish_$src", 0);
2632: $res = $self->{NAV_MAP}->getById($res);
2633: return $res;
2634: }
1.70 bowersj2 2635: sub map_pc {
2636: my $self = shift;
2637: my $src = $self->src();
2638: return $self->navHash("map_pc_$src", 0);
2639: }
1.51 bowersj2 2640: sub map_start {
2641: my $self = shift;
2642: my $src = $self->src();
2643: my $res = $self->navHash("map_start_$src", 0);
2644: $res = $self->{NAV_MAP}->getById($res);
2645: return $res;
2646: }
2647: sub map_type {
2648: my $self = shift;
2649: my $pc = $self->map_pc();
2650: return $self->navHash("map_type_$pc", 0);
2651: }
2652:
2653:
2654:
2655: #####
2656: # Property queries
2657: #####
2658:
2659: # These functions will be responsible for returning the CORRECT
2660: # VALUE for the parameter, no matter what. So while they may look
2661: # like direct calls to parmval, they can be more then that.
2662: # So, for instance, the duedate function should use the "duedatetype"
2663: # information, rather then the resource object user.
2664:
2665: =pod
2666:
2667: =head2 Resource Parameters
2668:
1.70 bowersj2 2669: 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 2670:
2671: 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.)
2672:
2673: =over 4
2674:
2675: =item * B<acc>: Get the Client IP/Name Access Control information.
2676:
2677: =item * B<answerdate>: Get the answer-reveal date for the problem.
2678:
2679: =item * B<duedate>: Get the due date for the problem.
2680:
2681: =item * B<tries>: Get the number of tries the student has used on the problem.
2682:
2683: =item * B<maxtries>: Get the number of max tries allowed.
2684:
2685: =item * B<opendate>: Get the open date for the problem.
2686:
2687: =item * B<sig>: Get the significant figures setting.
2688:
2689: =item * B<tol>: Get the tolerance for the problem.
2690:
1.70 bowersj2 2691: =item * B<tries>: Get the number of tries the user has already used on the problem.
2692:
1.51 bowersj2 2693: =item * B<type>: Get the question type for the problem.
2694:
2695: =item * B<weight>: Get the weight for the problem.
2696:
2697: =back
2698:
2699: =cut
2700:
2701: sub acc {
2702: (my $self, my $part) = @_;
2703: return $self->parmval("acc", $part);
2704: }
2705: sub answerdate {
2706: (my $self, my $part) = @_;
2707: # Handle intervals
2708: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2709: return $self->duedate($part) +
2710: $self->parmval("answerdate", $part);
2711: }
2712: return $self->parmval("answerdate", $part);
1.106 bowersj2 2713: }
1.108 bowersj2 2714: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
1.51 bowersj2 2715: sub duedate {
2716: (my $self, my $part) = @_;
2717: return $self->parmval("duedate", $part);
2718: }
2719: sub maxtries {
2720: (my $self, my $part) = @_;
2721: return $self->parmval("maxtries", $part);
2722: }
2723: sub opendate {
2724: (my $self, my $part) = @_;
2725: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2726: return $self->duedate($part) -
2727: $self->parmval("opendate", $part);
2728: }
2729: return $self->parmval("opendate");
2730: }
2731: sub sig {
2732: (my $self, my $part) = @_;
2733: return $self->parmval("sig", $part);
2734: }
2735: sub tol {
2736: (my $self, my $part) = @_;
2737: return $self->parmval("tol", $part);
2738: }
1.108 bowersj2 2739: sub tries {
2740: my $self = shift;
2741: my $tries = $self->queryRestoreHash('tries', shift);
2742: if (!defined($tries)) { return '0';}
1.51 bowersj2 2743: return $tries;
2744: }
1.70 bowersj2 2745: sub type {
2746: (my $self, my $part) = @_;
2747: return $self->parmval("type", $part);
2748: }
1.109 bowersj2 2749: sub weight {
2750: my $self = shift; my $part = shift;
1.70 bowersj2 2751: return $self->parmval("weight", $part);
2752: }
1.51 bowersj2 2753:
2754: # Multiple things need this
2755: sub getReturnHash {
2756: my $self = shift;
2757:
2758: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 2759: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 2760: $self->{RETURN_HASH} = \%tmpHash;
2761: }
2762: }
2763:
2764: ######
2765: # Status queries
2766: ######
2767:
2768: # These methods query the status of problems.
2769:
2770: # If we need to count parts, this function determines the number of
2771: # parts from the metadata. When called, it returns a reference to a list
2772: # of strings corresponding to the parts. (Thus, using it in a scalar context
2773: # tells you how many parts you have in the problem:
2774: # $partcount = scalar($resource->countParts());
2775: # Don't use $self->{PARTS} directly because you don't know if it's been
2776: # computed yet.
2777:
2778: =pod
2779:
2780: =head2 Resource misc
2781:
2782: Misc. functions for the resource.
2783:
2784: =over 4
2785:
1.59 bowersj2 2786: =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.
2787:
2788: =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:
2789:
2790: for (split(/\,/, $res->getFeedback())) {
2791: my $link = &Apache::lonnet::escape($_);
2792: ...
2793:
2794: and use the link as appropriate.
2795:
2796: =cut
2797:
2798: sub hasDiscussion {
2799: my $self = shift;
2800: return $self->{NAV_MAP}->hasDiscussion($self->symb());
2801: }
2802:
2803: sub getFeedback {
2804: my $self = shift;
1.124 bowersj2 2805: my $source = $self->src();
1.125 bowersj2 2806: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 2807: return $self->{NAV_MAP}->getFeedback($source);
2808: }
2809:
2810: sub getErrors {
2811: my $self = shift;
2812: my $source = $self->src();
2813: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
2814: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 2815: }
2816:
2817: =pod
2818:
1.70 bowersj2 2819: =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 2820:
1.70 bowersj2 2821: =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 2822:
2823: =back
2824:
2825: =cut
2826:
2827: sub parts {
2828: my $self = shift;
2829:
1.67 bowersj2 2830: if ($self->ext) { return ['0']; }
2831:
1.51 bowersj2 2832: $self->extractParts();
2833: return $self->{PARTS};
2834: }
2835:
2836: sub countParts {
2837: my $self = shift;
2838:
2839: my $parts = $self->parts();
1.66 bowersj2 2840:
2841: if ($self->{RESOURCE_ERROR}) {
2842: return 0;
2843: }
2844:
2845: if (scalar(@{$parts}) < 2) { return 1;}
1.51 bowersj2 2846:
2847: return scalar(@{$parts}) - 1;
2848: }
2849:
2850: # Private function: Extracts the parts information and saves it
2851: sub extractParts {
2852: my $self = shift;
2853:
2854: return if ($self->{PARTS});
1.67 bowersj2 2855: return if ($self->ext);
1.51 bowersj2 2856:
2857: $self->{PARTS} = [];
2858:
1.82 bowersj2 2859: # Retrieve part count, if this is a problem
2860: if ($self->is_problem()) {
2861: my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys');
2862: if (!$metadata) {
2863: $self->{RESOURCE_ERROR} = 1;
2864: $self->{PARTS} = [];
2865: return;
2866: }
2867:
2868: foreach (split(/\,/,$metadata)) {
2869: if ($_ =~ /^parameter\_(.*)\_opendate$/) {
2870: push @{$self->{PARTS}}, $1;
2871: }
1.51 bowersj2 2872: }
1.82 bowersj2 2873:
2874:
2875: # Is this possible to do in one line? - Jeremy
2876: my @sortedParts = sort @{$self->{PARTS}};
2877: $self->{PARTS} = \@sortedParts;
1.51 bowersj2 2878: }
2879:
2880: return;
2881: }
2882:
2883: =pod
2884:
2885: =head2 Resource Status
2886:
1.101 bowersj2 2887: Problem resources have status information, reflecting their various dates and completion statuses.
1.51 bowersj2 2888:
2889: There are two aspects to the status: the date-related information and the completion information.
2890:
2891: Idiomatic usage of these two methods would probably look something like
2892:
2893: foreach ($resource->parts()) {
2894: my $dateStatus = $resource->getDateStatus($_);
2895: my $completionStatus = $resource->getCompletionStatus($_);
2896:
1.70 bowersj2 2897: or
2898:
2899: my $status = $resource->status($_);
2900:
1.51 bowersj2 2901: ... use it here ...
2902: }
2903:
1.101 bowersj2 2904: 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.
2905:
2906: The symbolic constants shown below can be accessed through the resource object: $res->OPEN.
2907:
1.51 bowersj2 2908: =over 4
2909:
1.70 bowersj2 2910: =item * B<getDateStatus>($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 2911:
2912: =back
2913:
2914: B<Date Codes>
2915:
2916: =over 4
2917:
2918: =item * B<OPEN_LATER>: The problem will be opened later.
2919:
2920: =item * B<OPEN>: Open and not yet due.
2921:
1.59 bowersj2 2922:
1.54 bowersj2 2923: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
2924:
2925: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51 bowersj2 2926:
2927: =item * B<ANSWER_OPEN>: The answer date is here.
2928:
2929: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
2930:
2931: =back
2932:
2933: =cut
2934:
2935: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 2936: sub OPEN_LATER { return 0; }
2937: sub OPEN { return 1; }
2938: sub PAST_DUE_NO_ANSWER { return 2; }
2939: sub PAST_DUE_ANSWER_LATER { return 3; }
2940: sub ANSWER_OPEN { return 4; }
2941: sub NOTHING_SET { return 5; }
2942: sub NETWORK_FAILURE { return 100; }
2943:
2944: # getDateStatus gets the date status for a given problem part.
2945: # Because answer date, due date, and open date are fully independent
2946: # (i.e., it is perfectly possible to *only* have an answer date),
2947: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
2948: # (past, future, none given). This function handles this with a decision
2949: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 2950:
2951: sub getDateStatus {
2952: my $self = shift;
2953: my $part = shift;
2954: $part = "0" if (!defined($part));
1.54 bowersj2 2955:
2956: # Always return network failure if there was one.
1.51 bowersj2 2957: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2958:
2959: my $now = time();
2960:
1.53 bowersj2 2961: my $open = $self->opendate($part);
2962: my $due = $self->duedate($part);
2963: my $answer = $self->answerdate($part);
2964:
2965: if (!$open && !$due && !$answer) {
2966: # no data on the problem at all
2967: # should this be the same as "open later"? think multipart.
2968: return $self->NOTHING_SET;
2969: }
1.59 bowersj2 2970: if (!$open || $now < $open) {return $self->OPEN_LATER}
2971: if (!$due || $now < $due) {return $self->OPEN}
2972: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
2973: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 2974: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 2975: }
2976:
2977: =pod
2978:
2979: B<>
2980:
2981: =over 4
2982:
2983: =item * B<getCompletionStatus>($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:
2984:
2985: =back
2986:
2987: B<Completion Codes>
2988:
2989: =over 4
2990:
2991: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
2992:
2993: =item * B<INCORRECT>: Attempted, but wrong by student.
2994:
2995: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
2996:
2997: =item * B<CORRECT>: Correct or correct by instructor.
2998:
2999: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
3000:
3001: =item * B<EXCUSED>: Excused. Not yet implemented.
3002:
3003: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
3004:
1.69 bowersj2 3005: =item * B<ATTEMPTED>: Attempted, and not yet graded.
3006:
1.51 bowersj2 3007: =back
3008:
3009: =cut
3010:
1.53 bowersj2 3011: sub NOT_ATTEMPTED { return 10; }
3012: sub INCORRECT { return 11; }
3013: sub INCORRECT_BY_OVERRIDE { return 12; }
3014: sub CORRECT { return 13; }
3015: sub CORRECT_BY_OVERRIDE { return 14; }
3016: sub EXCUSED { return 15; }
1.69 bowersj2 3017: sub ATTEMPTED { return 16; }
1.51 bowersj2 3018:
3019: sub getCompletionStatus {
3020: my $self = shift;
3021: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3022:
1.108 bowersj2 3023: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 3024:
3025: # Left as seperate if statements in case we ever do more with this
3026: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3027: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3028: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3029: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3030: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 3031: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 3032: return $self->NOT_ATTEMPTED;
1.108 bowersj2 3033: }
3034:
3035: sub queryRestoreHash {
3036: my $self = shift;
3037: my $hashentry = shift;
3038: my $part = shift;
3039: $part = "0" if (!defined($part));
3040: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3041:
3042: $self->getReturnHash();
3043:
3044: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 3045: }
3046:
3047: =pod
3048:
3049: B<Composite Status>
3050:
1.101 bowersj2 3051: Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):
1.51 bowersj2 3052:
3053: =over 4
3054:
1.70 bowersj2 3055: =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
1.51 bowersj2 3056:
1.70 bowersj2 3057: =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 3058:
1.70 bowersj2 3059: =item * B<CORRECT>: For any reason at all, the part is considered correct.
1.51 bowersj2 3060:
1.70 bowersj2 3061: =item * B<EXCUSED>: For any reason at all, the problem is excused.
1.51 bowersj2 3062:
1.70 bowersj2 3063: =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
1.54 bowersj2 3064:
1.70 bowersj2 3065: =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 3066:
1.70 bowersj2 3067: =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
1.51 bowersj2 3068:
1.70 bowersj2 3069: =item * B<OPEN_LATER>: The problem is not yet open.
1.51 bowersj2 3070:
1.70 bowersj2 3071: =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
1.51 bowersj2 3072:
1.70 bowersj2 3073: =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
1.51 bowersj2 3074:
1.70 bowersj2 3075: =item * B<OPEN>: The item is open and not yet tried.
1.51 bowersj2 3076:
1.70 bowersj2 3077: =item * B<ATTEMPTED>: The problem has been attempted.
1.69 bowersj2 3078:
1.51 bowersj2 3079: =back
3080:
3081: =cut
3082:
3083: sub TRIES_LEFT { return 10; }
3084:
3085: sub status {
3086: my $self = shift;
3087: my $part = shift;
3088: if (!defined($part)) { $part = "0"; }
3089: my $completionStatus = $self->getCompletionStatus($part);
3090: my $dateStatus = $self->getDateStatus($part);
3091:
3092: # What we have is a two-dimensional matrix with 4 entries on one
3093: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 3094: # plus network failure and "no date data at all".
1.51 bowersj2 3095:
1.53 bowersj2 3096: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 3097:
3098: # There are a few whole rows we can dispose of:
1.53 bowersj2 3099: if ($completionStatus == CORRECT ||
3100: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.69 bowersj2 3101: return CORRECT;
3102: }
3103:
3104: if ($completionStatus == ATTEMPTED) {
3105: return ATTEMPTED;
1.53 bowersj2 3106: }
3107:
3108: # If it's EXCUSED, then return that no matter what
3109: if ($completionStatus == EXCUSED) {
3110: return EXCUSED;
1.51 bowersj2 3111: }
3112:
1.53 bowersj2 3113: if ($dateStatus == NOTHING_SET) {
3114: return NOTHING_SET;
1.51 bowersj2 3115: }
3116:
1.69 bowersj2 3117: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3118: # by 4 matrix (date statuses).
1.51 bowersj2 3119:
1.54 bowersj2 3120: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 3121: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 3122: return $dateStatus;
1.51 bowersj2 3123: }
3124:
1.53 bowersj2 3125: if ($dateStatus == ANSWER_OPEN) {
3126: return ANSWER_OPEN;
1.51 bowersj2 3127: }
3128:
3129: # Now: (incorrect, incorrect_override, not_attempted) x
3130: # (open_later), (open)
3131:
1.53 bowersj2 3132: if ($dateStatus == OPEN_LATER) {
3133: return OPEN_LATER;
1.51 bowersj2 3134: }
3135:
3136: # If it's WRONG...
1.53 bowersj2 3137: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 3138: # and there are TRIES LEFT:
1.79 bowersj2 3139: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 3140: return TRIES_LEFT;
1.51 bowersj2 3141: }
1.53 bowersj2 3142: return INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 3143: }
3144:
3145: # Otherwise, it's untried and open
1.53 bowersj2 3146: return OPEN;
1.51 bowersj2 3147: }
3148:
3149: =pod
3150:
3151: =head2 Resource/Nav Map Navigation
3152:
3153: =over 4
3154:
1.101 bowersj2 3155: =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 3156:
1.101 bowersj2 3157: =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 3158:
3159: =cut
3160:
3161: sub getNext {
3162: my $self = shift;
3163: my @branches;
3164: my $to = $self->to();
1.85 bowersj2 3165: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 3166: my $choice = $self->{NAV_MAP}->getById($branch);
3167: my $next = $choice->goesto();
3168: $next = $self->{NAV_MAP}->getById($next);
3169:
1.131 bowersj2 3170: push @branches, $next;
1.85 bowersj2 3171: }
3172: return \@branches;
3173: }
3174:
3175: sub getPrevious {
3176: my $self = shift;
3177: my @branches;
3178: my $from = $self->from();
3179: foreach my $branch ( split /,/, $from) {
3180: my $choice = $self->{NAV_MAP}->getById($branch);
3181: my $prev = $choice->comesfrom();
3182: $prev = $self->{NAV_MAP}->getById($prev);
3183:
1.131 bowersj2 3184: push @branches, $prev;
1.51 bowersj2 3185: }
3186: return \@branches;
1.131 bowersj2 3187: }
3188:
3189: sub browsePriv {
3190: my $self = shift;
3191: if (defined($self->{BROWSE_PRIV})) {
3192: return $self->{BROWSE_PRIV};
3193: }
3194:
3195: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 3196: }
3197:
3198: =pod
1.2 www 3199:
1.51 bowersj2 3200: =back
1.2 www 3201:
1.51 bowersj2 3202: =cut
1.2 www 3203:
1.51 bowersj2 3204: 1;
1.2 www 3205:
1.51 bowersj2 3206: __END__
1.2 www 3207:
3208:
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