Annotation of loncom/interface/lonnavmaps.pm, revision 1.98
1.72 bowersj2 1:
1.2 www 2: # The LearningOnline Network with CAPA
3: # Navigate Maps Handler
1.1 www 4: #
1.98 ! bowersj2 5: # $Id: lonnavmaps.pm,v 1.97 2002/11/03 21:05:03 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
40: #
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);
46: use Apache::lonnet();
1.18 albertel 47: use Apache::loncommon();
1.2 www 48: use GDBM_File;
1.73 bowersj2 49: use POSIX qw (floor strftime);
1.2 www 50:
51: # -------------------------------------------------------------- Module Globals
52: my %hash;
53: my @rows;
54:
1.10 www 55: #
56: # These cache hashes need to be independent of user, resource and course
57: # (user and course can/should be in the keys)
58: #
59:
60: my %courserdatas;
61: my %userrdatas;
62:
63: #
64: # These global hashes are dependent on user, course and resource,
65: # and need to be initialized every time when a sheet is calculated
66: #
67: my %courseopt;
68: my %useropt;
69: my %parmhash;
70:
1.47 bowersj2 71: # This parameter keeps track of whether obtaining the user's information
72: # failed, which the colorizer in astatus can use
73: my $networkFailedFlag = 0;
74:
1.2 www 75: # ------------------------------------------------------------------ Euclid gcd
76:
77: sub euclid {
78: my ($e,$f)=@_;
79: my $a; my $b; my $r;
80: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
81: while ($r!=0) {
1.51 bowersj2 82: $a=$b; $b=$r;
1.2 www 83: $r=$a%$b;
84: }
85: return $b;
86: }
87:
1.10 www 88: # --------------------------------------------------------------------- Parmval
89:
90: # -------------------------------------------- Figure out a cascading parameter
91: #
92: # For this function to work
93: #
94: # * parmhash needs to be tied
95: # * courseopt and useropt need to be initialized for this user and course
96: #
97:
98: sub parmval {
99: my ($what,$symb)=@_;
100: my $cid=$ENV{'request.course.id'};
101: my $csec=$ENV{'request.course.sec'};
102: my $uname=$ENV{'user.name'};
103: my $udom=$ENV{'user.domain'};
104:
105: unless ($symb) { return ''; }
106: my $result='';
107:
108: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
109:
110: # ----------------------------------------------------- Cascading lookup scheme
1.24 albertel 111: my $rwhat=$what;
112: $what=~s/^parameter\_//;
113: $what=~s/\_/\./;
114:
115: my $symbparm=$symb.'.'.$what;
116: my $mapparm=$mapname.'___(all).'.$what;
117: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
118:
119: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
120: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
121: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
122:
123: my $courselevel= $usercourseprefix.'.'.$what;
124: my $courselevelr=$usercourseprefix.'.'.$symbparm;
125: my $courselevelm=$usercourseprefix.'.'.$mapparm;
126:
127: # ---------------------------------------------------------- first, check user
1.57 albertel 128: if (defined($uname)) {
129: if (defined($useropt{$courselevelr})) { return $useropt{$courselevelr}; }
130: if (defined($useropt{$courselevelm})) { return $useropt{$courselevelm}; }
131: if (defined($useropt{$courselevel})) { return $useropt{$courselevel}; }
1.24 albertel 132: }
1.10 www 133:
1.24 albertel 134: # ------------------------------------------------------- second, check course
1.57 albertel 135: if (defined($csec)) {
136: if (defined($courseopt{$seclevelr})) { return $courseopt{$seclevelr}; }
137: if (defined($courseopt{$seclevelm})) { return $courseopt{$seclevelm}; }
138: if (defined($courseopt{$seclevel})) { return $courseopt{$seclevel}; }
1.24 albertel 139: }
1.10 www 140:
1.57 albertel 141: if (defined($courseopt{$courselevelr})) { return $courseopt{$courselevelr}; }
142: if (defined($courseopt{$courselevelm})) { return $courseopt{$courselevelm}; }
143: if (defined($courseopt{$courselevel})) { return $courseopt{$courselevel}; }
1.10 www 144:
1.24 albertel 145: # ----------------------------------------------------- third, check map parms
1.10 www 146:
1.24 albertel 147: my $thisparm=$parmhash{$symbparm};
1.57 albertel 148: if (defined($thisparm)) { return $thisparm; }
1.10 www 149:
1.24 albertel 150: # ----------------------------------------------------- fourth , check default
1.10 www 151:
1.25 albertel 152: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1.57 albertel 153: if (defined($default)) { return $default}
1.25 albertel 154:
155: # --------------------------------------------------- fifth , cascade up parts
156:
157: my ($space,@qualifier)=split(/\./,$rwhat);
158: my $qualifier=join('.',@qualifier);
159: unless ($space eq '0') {
1.51 bowersj2 160: my ($part,$id)=split(/\_/,$space);
161: if ($id) {
162: my $partgeneral=&parmval($part.".$qualifier",$symb);
1.57 albertel 163: if (defined($partgeneral)) { return $partgeneral; }
1.51 bowersj2 164: } else {
165: my $resourcegeneral=&parmval("0.$qualifier",$symb);
1.57 albertel 166: if (defined($resourcegeneral)) { return $resourcegeneral; }
1.51 bowersj2 167: }
1.25 albertel 168: }
169: return '';
1.10 www 170: }
171:
172:
173:
1.9 www 174: # ------------------------------------------------------------- Find out status
1.25 albertel 175: # return codes
176: # tcode (timecode)
177: # 1: will open later
178: # 2: is open and not past due yet
179: # 3: is past due date
180: # 4: due in the next 24 hours
181: #
182: # code (curent solved status)
183: # 1: not attempted
184: # 2: attempted but wrong, or incorrect by instructor
185: # 3: solved or correct by instructor
1.29 albertel 186: # 4: partially correct (one or more parts correct)
187: # "excused" needs to be supported, but is not yet.
1.9 www 188: sub astatus {
189: my $rid=shift;
1.29 albertel 190: my $code=0;
1.9 www 191: my $ctext='';
192: $rid=~/(\d+)\.(\d+)/;
1.10 www 193: my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
1.51 bowersj2 194: &Apache::lonnet::declutter($hash{'src_'.$rid});
1.15 www 195: my %duedate=();
196: my %opendate=();
197: my %answerdate=();
1.25 albertel 198: # need to always check part 0's open/due/answer status
1.51 bowersj2 199: foreach (sort(split(/\,/,&Apache::lonnet::metadata($hash{'src_'.$rid},'allpo\ssiblekeys')))) {
1.15 www 200: if ($_=~/^parameter\_(.*)\_opendate$/) {
1.51 bowersj2 201: my $part=$1;
1.15 www 202: $duedate{$part}=&parmval($part.'.duedate',$symb);
203: $opendate{$part}=&parmval($part.'.opendate',$symb);
204: $answerdate{$part}=&parmval($part.'.answerdate',$symb);
1.49 www 205: if (&parmval($part.'.opendate.type',$symb) eq 'date_interval') {
1.51 bowersj2 206: $opendate{$part}=$duedate{$part}-$opendate{$part};
1.49 www 207: }
1.50 www 208: if (&parmval($part.'.answerdate.type',$symb) eq 'date_interval') {
1.49 www 209: $answerdate{$part}=$duedate{$part}+$answerdate{$part};
210: }
1.15 www 211: }
1.25 albertel 212: }
1.11 www 213: my $now=time;
214: my $tcode=0;
1.16 www 215:
216: my %returnhash=&Apache::lonnet::restore($symb);
217:
1.25 albertel 218: foreach (sort(keys(%opendate))) {
1.51 bowersj2 219: my $duedate=$duedate{$_};
220: my $opendate=$opendate{$_};
221: my $answerdate=$answerdate{$_};
222: my $preface='';
223: unless ($_ eq '0') { $preface=' Part: '.$_.' '; }
224: if ($opendate) {
225: if ($now<$duedate || (!$duedate)) {
226: unless ($tcode==4) { $tcode=2; }
227: if ($duedate) {
228: $ctext.=$preface.'Due: '.localtime($duedate);
229: } else {
230: $ctext.=$preface.'No Due Date';
231: }
232: if ($now<$opendate) {
233: unless ($tcode) { $tcode=1; }
234: $ctext.=$preface.'Open: '.localtime($opendate);
235: }
236: if ($duedate && $duedate-$now<86400) {
237: $tcode=4;
238: $ctext.=$preface.'Due: '.localtime($duedate);
239: }
240: } else {
241: unless (($tcode==4) || ($tcode eq 2)) { $tcode=3; }
242: if ($now<$answerdate) {
243: $ctext.='Answer: '.localtime($duedate);
244: }
245: }
246: } else {
247: unless (($tcode==2) || ($tcode==4)) { $tcode=1; }
248: }
249:
250: my $status=$returnhash{'resource.'.$_.'.solved'};
251:
252: if ($status eq 'correct_by_student') {
253: if ($code==0||$code==3) { $code=3; } else { $code=4; }
254: $ctext.=' solved';
255: } elsif ($status eq 'correct_by_override') {
256: if ($code==0||$code==3) { $code=3; } else { $code=4; }
257: $ctext.=' override';
258: } elsif ($status eq 'incorrect_attempted') {
259: if ($code!=4 && $code!=3) { $code=2; }
260: if ($code==3) { $code=4; }
261: $ctext.=' ('.
262: ($returnhash{'resource.'.$_.'.tries'}?
263: $returnhash{'resource.'.$_.'.tries'}:'0');
264: my $numtries = &parmval($_.'.maxtries',$symb);
265: if ($numtries) { $ctext.='/'.$numtries.' tries'; }
266: $ctext.=')';
267: } elsif ($status eq 'incorrect_by_override') {
268: if ($code!=4 && $code!=3) { $code=2; }
269: if ($code==3) { $code=4; }
270: $ctext.=' override';
271: } elsif ($status eq 'excused') {
272: if ($code==0||$code==3) { $code=3; } else { $code=4; }
273: $ctext.=' excused';
274: } else {
275: if ($code==0) { $code=1; }
276: }
1.25 albertel 277: }
1.16 www 278:
1.11 www 279: return 'p'.$code.$tcode.'"'.$ctext.'"';
1.9 www 280: }
281:
1.2 www 282:
1.31 albertel 283: sub addresource {
1.32 albertel 284: my ($resource,$sofar,$rid,$showtypes,$indent,$linkid)=@_;
1.31 albertel 285: if ($showtypes eq 'problems') {
1.51 bowersj2 286: if ($resource!~/\.(problem|exam|quiz|assess|survey|form)$/) {
287: return;
288: }
1.31 albertel 289: }
290: my $brepriv=&Apache::lonnet::allowed('bre',$resource);
291: if ($hash{'src_'.$rid}) {
1.51 bowersj2 292: if (($brepriv eq '2') || ($brepriv eq 'F')) {
293: my $pprefix='';
294: if ($resource=~/\.(problem|exam|quiz|assess|survey|form)$/) {
295: $pprefix=&astatus($rid);
296: }
297: $$sofar++;
298: if ($indent) { $pprefix='i'.$indent.','.$pprefix; }
299: if ($linkid) { $pprefix='l'.$linkid.','.$pprefix; }
300: if (defined($rows[$$sofar])) {
301: $rows[$$sofar].='&'.$pprefix.$rid;
302: } else {
303: $rows[$$sofar]=$pprefix.$rid;
304: }
305: }
1.31 albertel 306: }
307: }
308:
309: sub followlinks () {
1.32 albertel 310: my ($rid,$sofar,$beenhere,$further,$showtypes,$indent,$linkid)=@_;
1.31 albertel 311: my $mincond=1;
312: my $next='';
313: foreach (split(/\,/,$hash{'to_'.$rid})) {
1.51 bowersj2 314: my $thiscond=
315: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
316: if ($thiscond>=$mincond) {
317: if ($next) {
318: $next.=','.$_.':'.$thiscond;
319: } else {
320: $next=$_.':'.$thiscond;
321: }
322: if ($thiscond>$mincond) { $mincond=$thiscond; }
323: }
1.31 albertel 324: }
1.32 albertel 325: my $col=0;
326: &Apache::lonxml::debug("following links -$next-");
1.31 albertel 327: foreach (split(/\,/,$next)) {
1.51 bowersj2 328: my ($nextlinkid,$condval)=split(/\:/,$_);
329: if ($condval>=$mincond) {
330: my $now=&tracetable($sofar,$hash{'goesto_'.$nextlinkid},
331: $beenhere,$showtypes,$indent,$linkid);
332: if ($now>$further) {
333: if ($col>0) {
334: my $string;
335: for(my $i=0;$i<$col;$i++) { $string.='&'; }
336: for(my $i=$further+1;$now-1>$i;$i++) {
337: $rows[$i]=$string.$rows[$i];
338: }
339: }
340: $further=$now;
341: }
342: }
343: $col++;
1.31 albertel 344: }
345: return $further;
346: }
347: # ------------------------------------------------------------ Build page table
348:
349: sub tracetable {
1.32 albertel 350: my ($sofar,$rid,$beenhere,$showtypes,$indent,$linkid)=@_;
351: my $newshowtypes=$showtypes;
1.31 albertel 352: my $further=$sofar;
1.44 www 353: # $Apache::lonxml::debug=1;
1.32 albertel 354: &Apache::lonxml::debug("$rid ; $linkid ; $sofar ; $beenhere ; ".$hash{'src_'.$rid});
355: if ($beenhere=~/\&$rid\&/) { return $further; }
356: $beenhere.=$rid.'&';
1.31 albertel 357:
358: if (defined($hash{'is_map_'.$rid})) {
1.51 bowersj2 359: $sofar++;
360: my $tprefix='';
361: if ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}
362: eq 'sequence') {
363: $tprefix='h';
364: } elsif ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}
365: eq 'page') {
366: $tprefix='j';
367: if ($indent) { $tprefix='i'.$indent.','.$tprefix; }
368: if ($linkid) { $tprefix='l'.$linkid.','.$tprefix; }
369: $newshowtypes='problems';
370: $indent++;
371: #if in a .page continue to link the encompising .page
372: if (!$linkid) { $linkid=$rid; }
373: }
374: if (defined($rows[$sofar])) {
375: $rows[$sofar].='&'.$tprefix.$rid;
376: } else {
377: $rows[$sofar]=$tprefix.$rid;
378: }
379: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
380: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
381: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
382: $sofar=&tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
383: '&'.$frid.'&',$newshowtypes,$indent,$linkid);
384: &addresource($hash{'src_'.$frid},\$sofar,$frid,$newshowtypes,
385: $indent,$linkid);
386: if ($tprefix =~ /j$/) { $indent--; $linkid=''; }
387: }
1.31 albertel 388: } else {
1.51 bowersj2 389: &addresource($hash{'src_'.$rid},\$sofar,$rid,$showtypes,
390: $indent,$linkid);
1.31 albertel 391: }
392:
393: if (defined($hash{'to_'.$rid})) {
1.51 bowersj2 394: $further=&followlinks($rid,$sofar,$beenhere,$further,$showtypes,
395: $indent,$linkid);
1.2 www 396: }
1.31 albertel 397:
1.2 www 398: return $further;
399: }
400:
401: # ================================================================ Main Handler
1.1 www 402:
403: sub handler {
1.28 albertel 404: my $r=shift;
1.2 www 405:
1.51 bowersj2 406: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
407:
408: if ($ENV{'form.jtest'} ne "1")
409: {
410: return new_handle($r);
411: }
1.2 www 412:
413: # ------------------------------------------- Set document type for header only
414:
1.28 albertel 415: if ($r->header_only) {
1.51 bowersj2 416: if ($ENV{'browser.mathml'}) {
417: $r->content_type('text/xml');
418: } else {
419: $r->content_type('text/html');
420: }
421: $r->send_http_header;
422: return OK;
1.28 albertel 423: }
424: my $requrl=$r->uri;
425: my $hashtied;
1.2 www 426: # ----------------------------------------------------------------- Tie db file
1.28 albertel 427: my $fn;
428: if ($ENV{'request.course.fn'}) {
1.51 bowersj2 429: $fn=$ENV{'request.course.fn'};
430: if (-e "$fn.db") {
431: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) &&
432: (tie(%parmhash,'GDBM_File',
433: $ENV{'request.course.fn'}.'_parms.db',
434: &GDBM_READER(),0640))) {
435: $hashtied=1;
436: }
437: }
1.28 albertel 438: }
439: if (!$hashtied) {
1.51 bowersj2 440: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
441: return HTTP_NOT_ACCEPTABLE;
1.28 albertel 442: }
443:
1.2 www 444: # ------------------------------------------------------------------- Hash tied
1.28 albertel 445:
446: if ($ENV{'browser.mathml'}) {
1.51 bowersj2 447: $r->content_type('text/xml');
1.28 albertel 448: } else {
1.51 bowersj2 449: $r->content_type('text/html');
1.28 albertel 450: }
451: &Apache::loncommon::no_cache($r);
452: $r->send_http_header;
453:
1.42 www 454: my $firstres=$hash{'map_start_'.
455: &Apache::lonnet::clutter($ENV{'request.course.uri'})};
456: my $lastres=$hash{'map_finish_'.
457: &Apache::lonnet::clutter($ENV{'request.course.uri'})};
1.28 albertel 458: if (!(($firstres) && ($lastres))) {
1.51 bowersj2 459: $r->print('<html><body>Coursemap undefined.</body></html>');
1.28 albertel 460: } else {
461:
1.2 www 462: # ----------------------------------------------------------------- Render page
1.10 www 463: # -------------------------------------------------------------- Set parameters
464:
465:
466: # ---------------------------- initialize coursedata and userdata for this user
1.51 bowersj2 467: undef %courseopt;
468: undef %useropt;
1.10 www 469:
1.51 bowersj2 470: my $uname=$ENV{'user.name'};
471: my $udom=$ENV{'user.domain'};
472: my $uhome=$ENV{'user.home'};
473: my $cid=$ENV{'request.course.id'};
474: my $chome=$ENV{'course.'.$cid.'.home'};
475: my ($cdom,$cnum)=split(/\_/,$cid);
476:
477: my $userprefix=$uname.'_'.$udom.'_';
478:
479: unless ($uhome eq 'no_host') {
1.48 bowersj2 480: # ------------------------------------------------- Get coursedata (if present)
1.51 bowersj2 481: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
482: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
483: ':resourcedata',$chome);
484: if ($reply!~/^error\:/) {
485: $courserdatas{$cid}=$reply;
486: $courserdatas{$cid.'.last_cache'}=time;
487: }
488: # check to see if network failed
489: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
490: {
491: $networkFailedFlag = 1;
492: }
493: }
494: foreach (split(/\&/,$courserdatas{$cid})) {
495: my ($name,$value)=split(/\=/,$_);
496: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
497: &Apache::lonnet::unescape($value);
498: }
1.10 www 499: # --------------------------------------------------- Get userdata (if present)
1.51 bowersj2 500: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
501: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
502: if ($reply!~/^error\:/) {
503: $userrdatas{$uname.'___'.$udom}=$reply;
504: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
505: }
506: }
507: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
508: my ($name,$value)=split(/\=/,$_);
509: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
510: &Apache::lonnet::unescape($value);
511: }
512: }
1.28 albertel 513:
1.51 bowersj2 514: @rows=();
1.28 albertel 515:
1.51 bowersj2 516: &tracetable(0,$firstres,'&','',0);
1.2 www 517:
518: # ------------------------------------------------------------------ Page parms
519:
1.51 bowersj2 520: my $j;
521: my $i;
522: my $lcm=1;
523: my $contents=0;
1.2 www 524:
525: # ---------------------------------------------- Go through table to get layout
526:
1.51 bowersj2 527: for ($i=0;$i<=$#rows;$i++) {
528: if ($rows[$i]) {
529: &Apache::lonxml::debug("Row $i is:".$rows[$i]);
530: $contents++;
531: my @colcont=split(/\&/,$rows[$i]);
532: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
533: }
534: }
1.5 www 535:
1.2 www 536:
1.51 bowersj2 537: unless ($contents) {
538: $r->print('<html><body>Empty Map.</body></html>');
539: } else {
1.10 www 540:
1.2 www 541: # ------------------------------------------------------------------ Build page
542:
1.51 bowersj2 543: my $currenturl=$ENV{'form.postdata'};
544: $currenturl=~s/^http\:\/\///;
545: $currenturl=~s/^[^\/]+//;
1.13 www 546:
1.2 www 547: # ---------------------------------------------------------------- Send headers
548:
1.51 bowersj2 549: my $date=localtime;
550: my $now=time;
1.21 www 551: # ----------------------------------------- Get email status and discussiontime
552:
1.51 bowersj2 553: my %emailstatus=&Apache::lonnet::dump('email_status');
554: my $logouttime=$emailstatus{'logout'};
555: my $courseleave=$emailstatus{'logout_'.$ENV{'request.course.id'}};
556: my $lastcheck=($courseleave>$logouttime?$courseleave:$logouttime);
557:
558: my %discussiontimes=&Apache::lonnet::dump('discussiontimes',
559: $cdom,$cnum);
560:
561: my %feedback=();
562: my %error=();
563: foreach my $msgid (split(/\&/,&Apache::lonnet::reply('keys:'.
564: $ENV{'user.domain'}.':'.
565: $ENV{'user.name'}.':nohist_email',
566: $ENV{'user.home'}))) {
567: $msgid=&Apache::lonnet::unescape($msgid);
568: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
569: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
570: my ($what,$url)=($1,$2);
571: my %status=
572: &Apache::lonnet::get('email_status',[$msgid]);
573: if ($status{$msgid}=~/^error\:/) {
574: $status{$msgid}='';
575: }
576:
577: if (($status{$msgid} eq 'new') ||
578: (!$status{$msgid})) {
579: if ($what eq 'Error') {
580: $error{$url}.=','.$msgid;
581: } else {
582: $feedback{$url}.=','.$msgid;
583: }
584: }
585: }
586: }
1.22 www 587: # ----------------------------------------------------------- Start Page Output
1.43 www 588: my $bodytagadd='';
1.51 bowersj2 589: $r->print(
1.43 www 590: '<html><head><title>Navigate Course Map</title></head>');
1.51 bowersj2 591: if (($currenturl=~/^\/res/) &&
592: ($currenturl!~/^\/res\/adm/)) {
593: $bodytagadd='onLoad="window.location.hash='."'curloc'".'"';
594: }
595: $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
1.43 www 596: $bodytagadd));
1.51 bowersj2 597: $r->print('<script>window.focus();</script>');
598: my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};
599: if (defined($desc)) { $r->print("<h2>$desc</h2>\n"); }
600: $r->print("<h3>$date</h3>\n");
601: $r->rflush();
602: $r->print('<img src="/adm/lonMisc/chat.gif"> New discussion since '.
603: localtime($lastcheck).
604: '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>');
605: if (($currenturl=~/^\/res/) &&
606: ($currenturl!~/^\/res\/adm/)) {
607: $r->print('<a href="#curloc">Current Location</a><p>');
608: }
609:
610: # Handle a network error
611:
612: if ($networkFailedFlag)
613: {
614: $r->print('<H2>LON-CAPA network failure.</H2>'."\n");
615: $r->print("<p>LON-CAPA's network is having difficulties, some problem" .
616: " information, such as due dates, will not be available.");
617: }
1.13 www 618: # ----------------------------------------------------- The little content list
1.51 bowersj2 619: for ($i=0;$i<=$#rows;$i++) {
620: if ($rows[$i]) {
621: my @colcont=split(/\&/,$rows[$i]);
622: my $avespan=$lcm/($#colcont+1);
623: for ($j=0;$j<=$#colcont;$j++) {
624: my $rid=$colcont[$j];
625: if ($rid=~/^h(.+)/) {
626: $rid=$1;
627: $r->print(' <a href="#'.
628: $rid.'">'.$hash{'title_'.$rid}.
629: '</a><br>');
630: }
631: }
632: }
633: }
1.2 www 634: # ----------------------------------------------------------------- Start table
1.51 bowersj2 635: $r->print('<hr><table cols="'.$lcm.'" border="0">');
636: for ($i=0;$i<=$#rows;$i++) {
637: if ($rows[$i]) {
638: $r->print("\n<tr>");
639: my @colcont=split(/\&/,$rows[$i]);
640: my $avespan=$lcm/($#colcont+1);
641:
642: # for each item I wish to print on this row...
643: for ($j=0;$j<=$#colcont;$j++) {
644: my $indent;my $indentstr;
645: my $linkid;
646: my $rid=$colcont[$j];
1.36 www 647: $rid=~/(\d+)\.(\d+)$/;
1.51 bowersj2 648: my $src=
649: &Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
650: my $symb=
651: &Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.$src;
652: my $add='<td>';
653: my $adde='</td>';
654: my $hwk='<font color="#223322">';
655: my $hwke='</font>';
656: if ($rid=~/^l(\d+\.\d+),(.+)/) { $linkid=$1; $rid=$2; }
657: if ($rid=~/^i(\d+),(.+)/) { $indent=$1; $rid=$2; }
658: if ($rid=~/^h(.+)/) {
659: $rid=$1;
660: $add='<th bgcolor="#AAFF55"><a name="'.$rid.'">';
661: $adde='</th>';
1.36 www 662: if (($ENV{'user.adv'}) &&
1.51 bowersj2 663: ($parmhash{$symb.'.0.parameter_randompick'})) {
1.36 www 664: $adde=' (randomly select '.
1.51 bowersj2 665: $parmhash{$symb.'.0.parameter_randompick'}.
1.36 www 666: ')</th>';
667: }
1.51 bowersj2 668: }
669: if ($rid=~/^j(.+)/) { $rid=$1; }
670: if ($rid=~/^p(\d)(\d)\"([\w\: \(\)\/\,]*)\"(.+)/) {
671: # sub astatus describes what code/tcode mean
672: my $code=$1;
673: my $tcode=$2;
674: my $ctext=$3;
675: $rid=$4;
676:
677: # will open later
678: if ($tcode eq '1') {
679: $add='<td bgcolor="#AAAAAA">';
680: }
681:
682: # solved/correct
683: if ($code eq '3') {
684: $add='<td bgcolor="#AAFFAA">';
685: } elsif ($code eq '4') { # partially correct
686: $add='<td bgcolor="#E0FFAA">';
687: } else {
688: # not attempted
689:
690: # we end up here on network failure, so pick a neutral
691: # color if the network failed instead of bright red.
692: if ( $networkFailedFlag )
693: {
694: $add = '<td bgcolor="#AAAAAA">';
695: }
696: else
697: {
698: $add='<td bgcolor="#FFAAAA">';
699: }
700:
701: if ($tcode eq '2') { # open, not past due
702: $add='<td bgcolor="#FFFFAA">';
703: }
704:
705: if ($tcode eq '4') { # due in next 24 hours
706: $add='<td bgcolor="#FFFF33">';
707: $adde='</td>';
708: }
709: }
710: $hwk='<font color="#888811"><b>';
711: $hwke='</b></font>';
712: if ($code eq '1') {
713: $hwke='</b> ('.$ctext.')</font>';
714: }
715: if ($code eq '2' || $code eq '4') {
716: $hwk='<font color="#992222"><b>';
717: $hwke='</b> ('.$ctext.')</font>';
718: }
719: if ($code eq '3') {
720: $hwk='<font color="#229922"><b>';
721: $hwke='</b> ('.$ctext.')</font>';
722: }
723: if ($networkFailedFlag)
724: {
725: $hwke='</b> (status unavailable)</font>';
726: }
727: }
728: if ($rid && $hash{'src_'.$rid} eq $currenturl) {
729: $add=$add.'<a name="curloc"></a>'.
730: '<font color=red size=+2><b>> </b></font>';
731: $adde=
732: '<font color=red size=+2><b> <</b></font>'.$adde;
733: }
734: if ($discussiontimes{$symb}>$lastcheck) {
735: $adde=
736: '<img border=0 src="/adm/lonMisc/chat.gif">'.
737: $adde;
738: }
739: if ($error{$src}) {
740: foreach (split(/\,/,$error{$src})) {
741: if ($_) {
742: $adde=
743: ' <a href="/adm/email?display='.
744: &Apache::lonnet::escape($_).
745: '"><img src="/adm/lonMisc/bomb.gif" border=0></a>'
746: .$adde;
747: }
748: }
749: }
750: if ($feedback{$src}) {
751: foreach (split(/\,/,$feedback{$src})) {
752: if ($_) {
753: $adde=
754: ' <a href="/adm/email?display='.
755: &Apache::lonnet::escape($_).
756: '"><img src="/adm/lonMisc/feedback.gif" border=0></a>'
757: .$adde;
758: }
759: }
760: }
761: if ($indent) {
762: my $is=" ";
763: for(my $i=-1;$i<$indent;$i++) { $indentstr.=$is; }
764: }
765: if (!$linkid) { $linkid=$rid; }
1.38 www 766: if ($hash{'randomout_'.$rid}) {
767: $adde=' <i>(hidden)</i>'.$adde;
768: }
1.51 bowersj2 769: $r->print($add.$indentstr);
770: if ($rid) {
771: $r->print('<a href="'.$hash{'src_'.$linkid}.
1.39 www 772: (($hash{'src_'.$linkid}=~/\?/)?'&':'?').
773: 'symb='.&Apache::lonnet::escape($symb)
1.35 www 774: .'">'.
1.51 bowersj2 775: $hwk.$hash{'title_'.$rid}.$hwke.'</a>');
776: }
777: $r->print($adde);
778: }
779: $r->print('</tr>');
780: }
781: }
782: $r->print("\n</table>");
783: $r->print('</body></html>');
1.2 www 784: # -------------------------------------------------------------------- End page
1.51 bowersj2 785: }
1.2 www 786: # ------------------------------------------------------------- End render page
1.28 albertel 787: }
1.2 www 788: # ------------------------------------------------------------------ Untie hash
1.28 albertel 789: unless (untie(%hash)) {
1.51 bowersj2 790: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
791: "Could not untie coursemap $fn (browse).</font>");
1.28 albertel 792: }
793: unless (untie(%parmhash)) {
1.51 bowersj2 794: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
795: "Could not untie parmhash (browse).</font>");
1.28 albertel 796: }
797: return OK;
1.2 www 798: }
1.1 www 799:
1.51 bowersj2 800: sub new_handle {
801: my $r = shift;
802:
803: # Handle header-only request
804: if ($r->header_only) {
805: if ($ENV{'browser.mathml'}) {
806: $r->content_type('text/xml');
807: } else {
808: $r->content_type('text/html');
809: }
810: $r->send_http_header;
811: return OK;
812: }
813:
814: # Send header, don't cache this page
815: if ($ENV{'browser.mathml'}) {
816: $r->content_type('text/xml');
817: } else {
818: $r->content_type('text/html');
819: }
820: &Apache::loncommon::no_cache($r);
821: $r->send_http_header;
822:
1.92 bowersj2 823: # Create the nav map the nav map
1.51 bowersj2 824: my $navmap = Apache::lonnavmaps::navmap->new(
825: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 826: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 827:
1.55 bowersj2 828:
829: if (!defined($navmap)) {
830: my $requrl = $r->uri;
831: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
832: return HTTP_NOT_ACCEPTABLE;
833: }
1.64 bowersj2 834:
835: # Header
836: $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
837: ''));
838: $r->print('<script>window.focus();</script>');
839: my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};
1.95 bowersj2 840: $r->print('<table border="0" cellpadding="2" cellspacing="0">');
1.64 bowersj2 841: my $date=localtime;
1.95 bowersj2 842: $r->print('<tr><td align="right" valign="bottom">Key: </td>');
1.65 bowersj2 843: if ($navmap->{LAST_CHECK}) {
1.95 bowersj2 844: $r->print('<td align="center" valign="bottom"> '.
845: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1.73 bowersj2 846: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1.95 bowersj2 847: '</td><td align="center" valign="bottom"> '.
848: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
849: '</td>');
850: } else {
851: $r->print('<td align="center" valign="bottom"> '.
852: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
853: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
854: '</td>');
855: }
856: $r->print('</tr></table>');
857: my $condition = 0;
858: if ($ENV{'form.condition'}) {
859: $condition = 1;
860: }
861:
862: if ($condition) {
863: $r->print('<a href="navmaps?condition=0&filter=">Close All Folders</a>');
1.65 bowersj2 864: } else {
1.95 bowersj2 865: $r->print('<a href="navmaps?condition=1&filter=">Open All Folders</a>');
1.65 bowersj2 866: }
1.55 bowersj2 867:
1.95 bowersj2 868: $r->print('<br> ');
869: $r->rflush();
870:
1.92 bowersj2 871: # Now that we've displayed some stuff to the user, init the navmap
872: $navmap->init();
873:
1.55 bowersj2 874: # Check that it's defined
875: if (!($navmap->courseMapDefined())) {
876: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
877: '</body></html>');
878: return OK;
879: }
880:
1.51 bowersj2 881: # Grab a resource object so we have access to the constants; this
882: # is technically not proper, but should be harmless
883: my $res = $navmap->firstResource();
884:
885: # Defines a status->color mapping, null string means don't color
886: my %colormap =
1.54 bowersj2 887: ( $res->NETWORK_FAILURE => '',
1.59 bowersj2 888: $res->CORRECT => '',
1.54 bowersj2 889: $res->EXCUSED => '#BBBBFF',
1.59 bowersj2 890: $res->PAST_DUE_ANSWER_LATER => '',
891: $res->PAST_DUE_NO_ANSWER => '',
892: $res->ANSWER_OPEN => '#CCFFCC',
1.54 bowersj2 893: $res->OPEN_LATER => '',
1.59 bowersj2 894: $res->TRIES_LEFT => '',
895: $res->INCORRECT => '',
896: $res->OPEN => '',
1.54 bowersj2 897: $res->NOTHING_SET => '' );
1.59 bowersj2 898: # And a special case in the nav map; what to do when the assignment
899: # is not yet done and due in less then 24 hours
1.86 bowersj2 900: my $hurryUpColor = "#FF0000";
1.59 bowersj2 901:
902: my %statusIconMap =
1.66 bowersj2 903: ( $res->NETWORK_FAILURE => '',
904: $res->NOTHING_SET => '',
905: $res->CORRECT => 'navmap.correct.gif',
906: $res->EXCUSED => 'navmap.correct.gif',
907: $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
908: $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
909: $res->ANSWER_OPEN => 'navmap.wrong.gif',
910: $res->OPEN_LATER => '',
911: $res->TRIES_LEFT => 'navmap.open.gif',
912: $res->INCORRECT => 'navmap.wrong.gif',
1.69 bowersj2 913: $res->OPEN => 'navmap.open.gif',
1.85 bowersj2 914: $res->ATTEMPTED => 'navmap.open.gif' );
1.69 bowersj2 915:
916: my %iconAltTags =
917: ( 'navmap.correct.gif' => 'Correct',
918: 'navmap.wrong.gif' => 'Incorrect',
919: 'navmap.open.gif' => 'Open' );
1.59 bowersj2 920:
921: my %condenseStatuses =
1.66 bowersj2 922: ( $res->NETWORK_FAILURE => 1,
923: $res->NOTHING_SET => 1,
924: $res->CORRECT => 1 );
1.51 bowersj2 925:
926: my %filterHash;
927: # Figure out what we're not displaying
928: foreach (split(/\,/, $ENV{"form.filter"})) {
929: if ($_) {
930: $filterHash{$_} = "1";
931: }
932: }
933:
1.88 bowersj2 934: # Is this a new-style course? If so, we want to suppress showing the top-level
935: # maps in their own folders, in favor of "inlining" them.
936: my $topResource = $navmap->getById("0.0");
937: my $inlineTopLevelMaps = $topResource->src() =~ m|^/uploaded/.*default\.sequence$|;
938:
1.63 bowersj2 939: my $currenturl = $ENV{'form.postdata'};
940: $currenturl=~s/^http\:\/\///;
941: $currenturl=~s/^[^\/]+//;
1.75 bowersj2 942: # alreadyHere allows us to only open the maps necessary to view
943: # the current location once, while at the same time remembering
944: # the current location. Without that check, the user would never
945: # be able to close those maps; the user would close it, and the
946: # currenturl scan would re-open it.
947: my $queryAdd = "postdata=" . &Apache::lonnet::escape($currenturl) .
948: "&alreadyHere=1";
1.63 bowersj2 949:
1.51 bowersj2 950: # Begin the HTML table
1.59 bowersj2 951: # four cols: resource + indent, chat+feedback, icon, text string
1.85 bowersj2 952: $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
1.51 bowersj2 953:
1.74 bowersj2 954: # This needs to be updated to use symbs from the remote,
955: # instead of uris. The changes to this and the main rendering
956: # loop should be obvious.
957: # Here's a simple example of the iterator.
1.88 bowersj2 958: # Preprocess the map: Look for current URL, force inlined maps to display
959:
1.96 bowersj2 960: # This currently does very little...
1.98 ! bowersj2 961: #my $mapEventualIterator = Apache::lonnavmaps::iterator->new($navmap, undef, undef, {},
! 962: #undef, $condition);
1.96 bowersj2 963:
1.88 bowersj2 964: my $mapIterator = $navmap->getIterator(undef, undef, {}, 1);
965: my $found = 0;
966: my $depth = 1;
1.91 bowersj2 967: my $currentUrlIndex = 0; # keeps track of when the current resource is found,
968: # so we can back up a few and put the anchor above the
969: # current resource
1.88 bowersj2 970: $mapIterator->next(); # discard the first BEGIN_MAP
971: my $curRes = $mapIterator->next();
1.91 bowersj2 972: my $counter = 0;
1.88 bowersj2 973:
974: while ($depth > 0) {
1.96 bowersj2 975: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
976: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.88 bowersj2 977:
1.91 bowersj2 978: if (ref($curRes)) { $counter++; }
979:
1.88 bowersj2 980: my $mapStack = $mapIterator->getStack();
981: if ($currenturl && !$ENV{'form.alreadyHere'} && ref($curRes) &&
982: $curRes->src() eq $currenturl) {
983: # If this is the correct resource, be sure to
984: # show it by making sure the containing maps
985: # are open.
1.91 bowersj2 986:
987: $currentUrlIndex = $counter;
1.88 bowersj2 988:
989: for my $map (@{$mapStack}) {
990: if ($condition) {
991: undef $filterHash{$map->map_pc()};
992: } else {
993: $filterHash{$map->map_pc()} = 1;
1.74 bowersj2 994: }
995: }
1.88 bowersj2 996: $ENV{'form.alreadyHere'} = 1;
997: }
998:
999: # Preprocessing: If we're inlining nav maps into the top-level display,
1000: # make sure we show this map!
1001: if ($inlineTopLevelMaps && ref($curRes) && $curRes->is_map &&
1002: scalar(@{$mapStack}) == 1) {
1003: if ($condition) {
1004: undef $filterHash{$curRes->map_pc()};
1005: } else {
1006: $filterHash{$curRes->map_pc()} = 1;
1007: }
1.74 bowersj2 1008: }
1.88 bowersj2 1009:
1010: $curRes = $mapIterator->next();
1.74 bowersj2 1011: }
1.88 bowersj2 1012:
1.53 bowersj2 1013: undef $res; # so we don't accidentally use it later
1.72 bowersj2 1014: my $indentLevel = 0;
1.61 bowersj2 1015: my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";
1.51 bowersj2 1016:
1017: my $isNewBranch = 0;
1.59 bowersj2 1018: my $now = time();
1019: my $in24Hours = $now + 24 * 60 * 60;
1.78 bowersj2 1020: my $displayedHereMarker = 0;
1.88 bowersj2 1021:
1.72 bowersj2 1022: # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
1023: # code in iterator->next), so ignore the first one
1.89 bowersj2 1024: $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
1.74 bowersj2 1025: $condition);
1.72 bowersj2 1026: $mapIterator->next();
1.89 bowersj2 1027: $curRes = $mapIterator->next();
1.88 bowersj2 1028: my $deltadepth = 0;
1.90 bowersj2 1029: $depth = 1;
1.88 bowersj2 1030:
1031: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1032: my $rowNum = 0;
1.51 bowersj2 1033:
1.91 bowersj2 1034: $counter = 0;
1035:
1.72 bowersj2 1036: while ($depth > 0) {
1.88 bowersj2 1037: # If we're in a new style course, and this is a BEGIN_MAP, END_MAP, or
1038: # map resource and the stack depth is only one, just plain ignore this resource
1039: # entirely. (This has the effect of inlining the resources in that map
1040: # in the nav map.)
1041: if ($inlineTopLevelMaps && scalar(@{$mapIterator->getStack()}) == 1 &&
1042: ref($curRes) && $curRes->is_map()) {
1043: # We let the normal depth stuff occur, but we need to shift everything
1044: # over by one to the left to make it look right.
1045: $deltadepth = -1;
1046: $curRes = $mapIterator->next();
1047: next;
1048: }
1049:
1.51 bowersj2 1050: if ($curRes == $mapIterator->BEGIN_MAP() ||
1.52 bowersj2 1051: $curRes == $mapIterator->BEGIN_BRANCH()) {
1.51 bowersj2 1052: $indentLevel++;
1053: }
1054: if ($curRes == $mapIterator->END_MAP() ||
1.52 bowersj2 1055: $curRes == $mapIterator->END_BRANCH()) {
1.51 bowersj2 1056: $indentLevel--;
1057: }
1.52 bowersj2 1058: if ($curRes == $mapIterator->BEGIN_BRANCH()) {
1059: $isNewBranch = 1;
1.72 bowersj2 1060: }
1.96 bowersj2 1061: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1062: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1.51 bowersj2 1063:
1.91 bowersj2 1064: if (ref($curRes)) { $counter++; }
1065:
1.88 bowersj2 1066: if ($depth == 1) { $deltadepth = 0; } # we're done shifting, because we're
1067: # out of the inlined map
1068:
1.68 bowersj2 1069: # Is this resource being blotted out?
1070: if (ref($curRes) && !advancedUser() && $curRes->randomout()) {
1071: $curRes = $mapIterator->next();
1072: next; # and totally ignore this resource
1073: }
1074:
1.51 bowersj2 1075: if (ref($curRes) && $curRes->src()) {
1076:
1.66 bowersj2 1077: # Step one: Decide which parts to show
1078: my @parts = @{$curRes->parts()};
1079: my $multipart = scalar(@parts) > 1;
1080: my $condensed = 0;
1081:
1.51 bowersj2 1082: if ($curRes->is_problem()) {
1.66 bowersj2 1083: # Is it multipart?
1.59 bowersj2 1084:
1.66 bowersj2 1085: if ($multipart) {
1086: # If it's multipart, see if part 0 is "open"
1087: # if it is, display all parts, if it isn't,
1088: # just display first
1089: if (!$curRes->opendate("0")) {
1090: @parts = ("0"); # just display the zero-th part
1.68 bowersj2 1091: $condensed = 1;
1.66 bowersj2 1092: } else {
1093: # Otherwise, only display part 0 if we want to
1094: # attach feedback or email information to it
1095: if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
1096: shift @parts;
1097: } else {
1098: # If there's discussion or feedback, that counts
1099: # as a difference, so display the parts.
1100:
1101: # Now, we decide whether to condense the
1102: # parts due to similarity
1103: my $status = $curRes->status($parts[1]);
1104: my $due = $curRes->duedate($parts[1]);
1105: my $open = $curRes->opendate($parts[1]);
1106: my $statusAllSame = 1;
1107: my $dueAllSame = 1;
1108: my $openAllSame = 1;
1109: for (my $i = 2; $i < scalar(@parts); $i++) {
1110: if ($curRes->status($parts[$i]) != $status){
1111: $statusAllSame = 0;
1112: }
1113: if ($curRes->duedate($parts[$i]) != $due ) {
1114: $dueAllSame = 0;
1115: }
1116: if ($curRes->opendate($parts[$i]) != $open) {
1117: $openAllSame = 0;
1118: }
1119: }
1120:
1121: # $allSame is true if all the statuses were
1122: # the same. Now, if they are all the same and
1123: # match one of the statuses to condense, or they
1124: # are all open with the same due date, or they are
1125: # all OPEN_LATER with the same open date, display the
1126: # status of the first non-zero part (to get the 'correct'
1127: # status right, since 0 is never 'correct' or 'open').
1128: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1129: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1130: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1131: @parts = ($parts[1]);
1132: $condensed = 1;
1133: }
1134: }
1135: }
1136: }
1.59 bowersj2 1137:
1.51 bowersj2 1138: } else {
1.84 bowersj2 1139: $parts[0] = "0"; # this is to get past foreach loop below
1.51 bowersj2 1140: # you can consider a non-problem resource as a resource
1.77 bowersj2 1141: # with only one part without loss
1.51 bowersj2 1142: }
1143:
1.83 bowersj2 1144: # Is it a multipart problem with a single part, now in
1145: # @parts with "0" filtered out? If so, forget it's a multi-part
1146: # problem and treat it like a single-part problem.
1147: if ( scalar(@parts) == 1 ) {
1148: $multipart = 0;
1149: }
1150:
1.66 bowersj2 1151: # Display one part, in event of network error.
1152: # If this is a single part, we can at least show the correct
1153: # status, but if it's multipart, we're lost.
1154: if ($curRes->{RESOURCE_ERROR}) {
1155: @parts = ("0");
1156: }
1157:
1158: # Step two: Show the parts
1.51 bowersj2 1159: foreach my $part (@parts) {
1.59 bowersj2 1160:
1.66 bowersj2 1161: my $deltalevel = 0; # for inserting the branch icon
1.68 bowersj2 1162: my $nonLinkedText = ""; # unlinked stuff after title
1.51 bowersj2 1163:
1164: # For each thing we're displaying...
1165:
1166: my $stack = $mapIterator->getStack();
1167: my $src = getLinkForResource($stack);
1168:
1169: my $srcHasQuestion = $src =~ /\?/;
1170: my $link = $src.
1171: ($srcHasQuestion?'&':'?') .
1172: 'symb='.&Apache::lonnet::escape($curRes->symb()).
1173: '"';
1174: my $title = $curRes->title();
1.81 bowersj2 1175: if (!$title) {
1176: $title = $curRes->src();
1177: $title = substr ($title, rindex($title, "/") + 1);
1178: }
1.51 bowersj2 1179: my $partLabel = "";
1.52 bowersj2 1180: my $newBranchText = "";
1181:
1182: # If this is a new branch, label it so
1183: # (temporary, this should be an icon w/ alt text)
1184: if ($isNewBranch) {
1.59 bowersj2 1185: $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
1.52 bowersj2 1186: $isNewBranch = 0;
1.66 bowersj2 1187: $deltalevel = 1;
1.52 bowersj2 1188: }
1.51 bowersj2 1189:
1190: # links to open and close the folders
1191: my $linkopen = "<a href=\"$link\">";
1192: my $linkclose = "</a>";
1193:
1.61 bowersj2 1194: my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";
1.51 bowersj2 1195: if ($curRes->is_problem()) {
1.66 bowersj2 1196: if ($part eq "0" || $condensed) {
1197: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />';
1198: } else {
1199: $icon = $indentString;
1200: }
1.51 bowersj2 1201: }
1202:
1203: # Display the correct icon, link to open or shut map
1204: if ($curRes->is_map()) {
1205: my $mapId = $curRes->map_pc();
1.82 bowersj2 1206: my $nowOpen = (!defined($filterHash{$mapId}));
1207: if ($condition) {$nowOpen = !$nowOpen;}
1.51 bowersj2 1208: $icon = $nowOpen ?
1.77 bowersj2 1209: "navmap.folder.closed.gif" : "navmap.folder.open.gif";
1.66 bowersj2 1210: $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";
1.52 bowersj2 1211: $linkopen = "<a href=\"/adm/navmaps?filter=";
1.66 bowersj2 1212: $linkopen .= ($nowOpen xor $condition) ?
1.51 bowersj2 1213: addToFilter(\%filterHash, $mapId) :
1214: removeFromFilter(\%filterHash, $mapId);
1.66 bowersj2 1215: $linkopen .= "&condition=$condition&$queryAdd\">";
1.51 bowersj2 1216: $linkclose = "</a>";
1.68 bowersj2 1217:
1.51 bowersj2 1218: }
1219:
1220: my $colorizer = "";
1.86 bowersj2 1221: my $color;
1.51 bowersj2 1222: if ($curRes->is_problem()) {
1223: my $status = $curRes->status($part);
1.86 bowersj2 1224: $color = $colormap{$status};
1.74 bowersj2 1225:
1226: # Special case in the navmaps: If in less then
1227: # 24 hours, give it a bit of urgency
1.86 bowersj2 1228: if (($status == $curRes->OPEN() || $status == $curRes->ATTEMPTED() ||
1229: $status == $curRes->TRIES_LEFT())
1230: && $curRes->duedate() &&
1.76 bowersj2 1231: $curRes->duedate() < time()+(24*60*60) &&
1232: $curRes->duedate() > time()) {
1.74 bowersj2 1233: $color = $hurryUpColor;
1234: }
1.79 bowersj2 1235: # Special case: If this is the last try, and there is
1.88 bowersj2 1236: # more then one available, and it's not due yet, give a bit of urgency
1.79 bowersj2 1237: my $tries = $curRes->tries($part);
1238: my $maxtries = $curRes->maxtries($part);
1239: if ($tries && $maxtries && $maxtries > 1 &&
1.88 bowersj2 1240: $maxtries - $tries == 1 && $curRes->duedate() &&
1241: $curRes->duedate() > time()) {
1.79 bowersj2 1242: $color = $hurryUpColor;
1243: }
1.51 bowersj2 1244: if ($color ne "") {
1245: $colorizer = "bgcolor=\"$color\"";
1246: }
1247: }
1248:
1.68 bowersj2 1249: if ($curRes->randomout()) {
1250: $nonLinkedText .= ' <i>(hidden)</i> ';
1251: }
1252:
1.88 bowersj2 1253: $rowNum++;
1254: my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
1255:
1.91 bowersj2 1256: # FIRST COL: The resource indentation, branch icon, name, and anchor
1.88 bowersj2 1257: $r->print(" <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\" width=\"60%\">\n");
1.51 bowersj2 1258:
1.91 bowersj2 1259: # anchor for current resource... - 5 is deliberate: If it's that
1260: # high on the screen, don't bother focusing on it. Also this will
1261: # print multiple anchors if this is an expanded multi-part problem...
1262: # who cares?
1263: if ($counter == $currentUrlIndex - 5) {
1264: $r->print('<a name="current" />');
1265: }
1266:
1.51 bowersj2 1267: # print indentation
1.88 bowersj2 1268: for (my $i = 0; $i < $indentLevel - $deltalevel + $deltadepth; $i++) {
1.51 bowersj2 1269: $r->print($indentString);
1270: }
1271:
1.61 bowersj2 1272: $r->print(" ${newBranchText}${linkopen}$icon${linkclose}\n");
1.51 bowersj2 1273:
1.74 bowersj2 1274: my $curMarkerBegin = "";
1275: my $curMarkerEnd = "";
1276:
1277: # Is this the current resource?
1.78 bowersj2 1278: if ($curRes->src() eq $currenturl && !$displayedHereMarker) {
1.74 bowersj2 1279: $curMarkerBegin = '<a name="curloc" /><font color="red" size="+2">> </font>';
1280: $curMarkerEnd = '<font color="red" size="+2"> <</font>';
1.78 bowersj2 1281: $displayedHereMarker = 1;
1.74 bowersj2 1282: }
1283:
1.69 bowersj2 1284: if ($curRes->is_problem() && $part ne "0" && !$condensed) {
1.66 bowersj2 1285: $partLabel = " (Part $part)";
1286: $title = "";
1287: }
1.83 bowersj2 1288: if ($multipart && $condensed) {
1.68 bowersj2 1289: $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';
1.66 bowersj2 1290: }
1.59 bowersj2 1291:
1.74 bowersj2 1292: $r->print(" $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
1.98 ! bowersj2 1293: #$r->print(" TDV:" . $curRes->{DATA}->{TOP_DOWN_VAL}); # temp
! 1294: #$r->print(" BUV:" . $curRes->{DATA}->{BOT_UP_VAL}); # temp
! 1295: #$r->print(" DD:" . $curRes->{DATA}->{DISPLAY_DEPTH}); # temp
1.66 bowersj2 1296:
1297: if ($curRes->{RESOURCE_ERROR}) {
1298: $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
1.84 bowersj2 1299: '<font size="-1">Host down</font>'));
1.66 bowersj2 1300: }
1301:
1302: my $discussionHTML = ""; my $feedbackHTML = "";
1303:
1.85 bowersj2 1304: # SECOND COL: Is there text, feedback, errors??
1.66 bowersj2 1305: if ($curRes->hasDiscussion()) {
1306: $discussionHTML = $linkopen .
1307: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
1308: $linkclose;
1309: }
1310:
1311: if ($curRes->getFeedback()) {
1312: my $feedback = $curRes->getFeedback();
1313: foreach (split(/\,/, $feedback)) {
1314: if ($_) {
1315: $feedbackHTML .= ' <a href="/adm/email?display='
1316: . &Apache::lonnet::escape($_) . '">'
1317: . '<img src="/adm/lonMisc/feedback.gif" '
1318: . 'border="0" /></a>';
1319: }
1320: }
1321: }
1322:
1.84 bowersj2 1323: $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML </td>");
1.66 bowersj2 1324:
1325: # Is this the first displayed part of a multi-part problem
1326: # that has not been condensed, so we should suppress these two
1327: # columns?
1328: my $firstDisplayed = !$condensed && $multipart && $part eq "0";
1329:
1.69 bowersj2 1330: # THIRD COL: Problem status icon
1.66 bowersj2 1331: if ($curRes->is_problem() &&
1332: !$firstDisplayed) {
1333: my $icon = $statusIconMap{$curRes->status($part)};
1.69 bowersj2 1334: my $alt = $iconAltTags{$icon};
1.66 bowersj2 1335: if ($icon) {
1.84 bowersj2 1336: $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");
1.66 bowersj2 1337: } else {
1.84 bowersj2 1338: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 1339: }
1340: } else { # not problem, no icon
1.84 bowersj2 1341: $r->print("<td width=\"30\"> </td>\n");
1.66 bowersj2 1342: }
1343:
1.69 bowersj2 1344: # FOURTH COL: Text description
1.86 bowersj2 1345: #$r->print("<td $colorizer align=\"right\" valign=\"center\">\n");
1346: $r->print("<td align=\"right\" valign=\"center\">\n");
1.51 bowersj2 1347:
1.61 bowersj2 1348: if ($curRes->kind() eq "res" &&
1349: $curRes->is_problem() &&
1.66 bowersj2 1350: !$firstDisplayed) {
1.86 bowersj2 1351: $r->print ("<font color=\"$color\"><b>") if ($color);
1.53 bowersj2 1352: $r->print (getDescription($curRes, $part));
1.86 bowersj2 1353: $r->print ("</b></font>") if ($color);
1.51 bowersj2 1354: }
1.68 bowersj2 1355: if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {
1356: $r->print('(randomly select ' . $curRes->randompick() .')');
1357: }
1.59 bowersj2 1358:
1.84 bowersj2 1359: $r->print(" </td></tr>\n");
1.51 bowersj2 1360: }
1361: }
1362: $curRes = $mapIterator->next();
1363: }
1364:
1365: $r->print("</table></body></html>");
1366:
1.59 bowersj2 1367: $navmap->untieHashes();
1368:
1.51 bowersj2 1369: return OK;
1370: }
1371:
1372: # Convenience functions: Returns a string that adds or subtracts
1373: # the second argument from the first hash, appropriate for the
1374: # query string that determines which folders to recurse on
1375: sub addToFilter {
1376: my $hashIn = shift;
1377: my $addition = shift;
1378: my %hash = %$hashIn;
1379: $hash{$addition} = 1;
1380:
1381: return join (",", keys(%hash));
1382: }
1383:
1384: sub removeFromFilter {
1385: my $hashIn = shift;
1386: my $subtraction = shift;
1387: my %hash = %$hashIn;
1388:
1389: delete $hash{$subtraction};
1390: return join(",", keys(%hash));
1391: }
1392:
1393: # Convenience function: Given a stack returned from getStack on the iterator,
1394: # return the correct src() value.
1395: # Later, this should add an anchor when we start putting anchors in pages.
1396: sub getLinkForResource {
1397: my $stack = shift;
1398: my $res;
1399:
1400: # Check to see if there are any pages in the stack
1401: foreach $res (@$stack) {
1402: if (defined($res) && $res->is_page()) {
1403: return $res->src();
1404: }
1405: }
1406:
1407: # Failing that, return the src of the last resource that is defined
1408: # (when we first recurse on a map, it puts an undefined resource
1409: # on the bottom because $self->{HERE} isn't defined yet, and we
1410: # want the src for the map anyhow)
1411: foreach (@$stack) {
1412: if (defined($_)) { $res = $_; }
1413: }
1414:
1415: return $res->src();
1416: }
1417:
1.53 bowersj2 1418: # Convenience function: This seperates the logic of how to create
1419: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
1420: # etc.) into a seperate function. It takes a resource object as the
1421: # first parameter, and the part number of the resource as the second.
1422: # It's basically a big switch statement on the status of the resource.
1423:
1424: sub getDescription {
1425: my $res = shift;
1426: my $part = shift;
1.69 bowersj2 1427: my $status = $res->status($part);
1.53 bowersj2 1428:
1429: if ($status == $res->NETWORK_FAILURE) { return ""; }
1430: if ($status == $res->NOTHING_SET) {
1431: return "Not currently assigned.";
1432: }
1433: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 1434: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 1435: }
1436: if ($status == $res->OPEN) {
1.79 bowersj2 1437: if ($res->duedate($part)) {
1.73 bowersj2 1438: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 1439: } else {
1440: return "Open, no due date";
1441: }
1.53 bowersj2 1442: }
1.54 bowersj2 1443: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 1444: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 1445: }
1446: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 1447: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 1448: }
1449: if ($status == $res->ANSWER_OPEN) {
1450: return "Answer available";
1451: }
1.59 bowersj2 1452: if ($status == $res->EXCUSED) {
1.66 bowersj2 1453: return "Excused by instructor";
1.59 bowersj2 1454: }
1.69 bowersj2 1455: if ($status == $res->ATTEMPTED) {
1456: return "Not yet graded.";
1457: }
1.59 bowersj2 1458: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 1459: my $tries = $res->tries($part);
1460: my $maxtries = $res->maxtries($part);
1461: my $triesString = "";
1462: if ($tries && $maxtries) {
1463: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
1464: if ($maxtries > 1 && $maxtries - $tries == 1) {
1465: $triesString = "<b>$triesString</b>";
1466: }
1467: }
1.66 bowersj2 1468: if ($res->duedate()) {
1.73 bowersj2 1469: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 1470: " $triesString";
1471: } else {
1472: return "No due date $triesString";
1473: }
1.59 bowersj2 1474: }
1.53 bowersj2 1475: }
1476:
1.68 bowersj2 1477: sub advancedUser {
1478: return $ENV{'user.adv'};
1479: }
1480:
1.73 bowersj2 1481:
1482: # timeToHumanString takes a time number and converts it to a
1483: # human-readable representation, meant to be used in the following
1484: # manner:
1485: # print "Due $timestring"
1486: # print "Open $timestring"
1487: # print "Answer available $timestring"
1488: # Very, very, very, VERY English-only... goodness help a localizer on
1489: # this func...
1.53 bowersj2 1490: sub timeToHumanString {
1.58 albertel 1491: my ($time) = @_;
1492: # zero, '0' and blank are bad times
1.73 bowersj2 1493: if (!$time) {
1494: return 'never';
1495: }
1496:
1497: my $now = time();
1498:
1499: my @time = localtime($time);
1500: my @now = localtime($now);
1501:
1502: # Positive = future
1503: my $delta = $time - $now;
1504:
1505: my $minute = 60;
1506: my $hour = 60 * $minute;
1507: my $day = 24 * $hour;
1508: my $week = 7 * $day;
1509: my $inPast = 0;
1510:
1511: # Logic in comments:
1512: # Is it now? (extremely unlikely)
1513: if ( $delta == 0 ) {
1514: return "this instant";
1515: }
1516:
1517: if ($delta < 0) {
1518: $inPast = 1;
1519: $delta = -$delta;
1520: }
1521:
1522: # Is it in the future?
1523: if ( $delta > 0 ) {
1524: # Is it less then a minute away?
1525: my $tense = $inPast ? " ago" : "";
1526: my $prefix = $inPast ? "" : "in ";
1527: if ( $delta < $minute ) {
1528: if ($delta == 1) { return "${prefix}1 second$tense"; }
1529: return "$prefix$delta seconds$tense";
1530: }
1531:
1532: # Is it less then an hour away?
1533: if ( $delta < $hour ) {
1534: # If so, use minutes
1535: my $minutes = floor($delta / 60);
1536: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
1537: return "$prefix$minutes minutes$tense";
1538: }
1539:
1540: # Is it less then 24 hours away? If so,
1541: # display hours + minutes
1542: if ( $delta < $hour * 24) {
1543: my $hours = floor($delta / $hour);
1544: my $minutes = floor(($delta % $hour) / $minute);
1545: my $hourString = "$hours hours";
1546: my $minuteString = ", $minutes minutes";
1547: if ($hours == 1) {
1548: $hourString = "1 hour";
1549: }
1550: if ($minutes == 1) {
1551: $minuteString = ", 1 minute";
1552: }
1553: if ($minutes == 0) {
1554: $minuteString = "";
1555: }
1556: return "$prefix$hourString$minuteString$tense";
1557: }
1558:
1559: # Less then 5 days away, display day of the week and
1560: # HH:MM
1561: if ( $delta < $day * 5 ) {
1.85 bowersj2 1562: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 1563: $timeStr =~ s/12:00 am/midnight/;
1564: $timeStr =~ s/12:00 pm/noon/;
1565: return ($inPast ? "last " : "next ") .
1566: $timeStr;
1567: }
1568:
1569: # Is it this year?
1570: if ( $time[5] == $now[5]) {
1571: # Return on Month Day, HH:MM meridian
1572: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
1573: $timeStr =~ s/12:00 am/midnight/;
1574: $timeStr =~ s/12:00 pm/noon/;
1575: return $timeStr;
1576: }
1577:
1578: # Not this year, so show the year
1579: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
1580: $timeStr =~ s/12:00 am/midnight/;
1581: $timeStr =~ s/12:00 pm/noon/;
1582: return $timeStr;
1.58 albertel 1583: }
1.53 bowersj2 1584: }
1585:
1.51 bowersj2 1586: 1;
1587:
1588: package Apache::lonnavmaps::navmap;
1589:
1590: =pod
1591:
1592: lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, and also provides the Apache handler for the "Navigation Map" button.
1593:
1594: =head1 navmap object: Encapsulating the compiled nav map
1595:
1596: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
1597:
1598: 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.
1599:
1600: You must obtain resource objects through the navmap object.
1601:
1602: =head2 Methods
1603:
1604: =over 4
1605:
1.70 bowersj2 1606: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions, genMailDiscussStatus): Binds a new navmap object to the compiled nav map hash and parm hash given as filenames. genCourseAndUserOptions is a flag saying whether the course options and user options hash should be generated. This is for when you are using the parameters of the resources that require them; see documentation in resource object documentation. genMailDiscussStatus causes the nav map to retreive information about the email and discussion status of resources. Returns the navmap object if this is successful, or B<undef> if not. You must check for undef; errors will occur when you try to use the other methods otherwise.
1.51 bowersj2 1607:
1608: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
1609:
1610: =cut
1611:
1612: use strict;
1613: use GDBM_File;
1614:
1615: sub new {
1616: # magic invocation to create a class instance
1617: my $proto = shift;
1618: my $class = ref($proto) || $proto;
1619: my $self = {};
1620:
1621: $self->{NAV_HASH_FILE} = shift;
1622: $self->{PARM_HASH_FILE} = shift;
1623: $self->{GENERATE_COURSE_USER_OPT} = shift;
1.55 bowersj2 1624: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1.51 bowersj2 1625:
1626: # Resource cache stores navmapresource's as we reference them. We generate
1627: # them on-demand so we don't pay for creating resources unless we use them.
1628: $self->{RESOURCE_CACHE} = {};
1629:
1630: # Network failure flag, if we accessed the course or user opt and
1631: # failed
1632: $self->{NETWORK_FAILURE} = 0;
1633:
1634: # tie the nav hash
1635: my %navmaphash;
1636: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1637: &GDBM_READER(), 0640))) {
1638: return undef;
1639: }
1640: $self->{NAV_HASH} = \%navmaphash;
1641:
1642: my %parmhash;
1643: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1644: &GDBM_READER(), 0640)))
1645: {
1.66 bowersj2 1646: untie $self->{PARM_HASH};
1.51 bowersj2 1647: return undef;
1648: }
1649: $self->{PARM_HASH} = \%parmhash;
1650: $self->{HASH_TIED} = 1;
1651:
1.92 bowersj2 1652: bless($self);
1653:
1654: return $self;
1655: }
1656:
1657: sub init {
1.93 bowersj2 1658: my $self = shift;
1.92 bowersj2 1659:
1.51 bowersj2 1660: # If the course opt hash and the user opt hash should be generated,
1661: # generate them
1662: if ($self->{GENERATE_COURSE_USER_OPT}) {
1663: my $uname=$ENV{'user.name'};
1664: my $udom=$ENV{'user.domain'};
1665: my $uhome=$ENV{'user.home'};
1666: my $cid=$ENV{'request.course.id'};
1667: my $chome=$ENV{'course.'.$cid.'.home'};
1668: my ($cdom,$cnum)=split(/\_/,$cid);
1669:
1670: my $userprefix=$uname.'_'.$udom.'_';
1671:
1672: my %courserdatas; my %useropt; my %courseopt;
1673: unless ($uhome eq 'no_host') {
1674: # ------------------------------------------------- Get coursedata (if present)
1675: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1676: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1677: ':resourcedata',$chome);
1678: if ($reply!~/^error\:/) {
1679: $courserdatas{$cid}=$reply;
1680: $courserdatas{$cid.'.last_cache'}=time;
1681: }
1682: # check to see if network failed
1683: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1684: {
1685: $self->{NETWORK_FAILURE} = 1;
1686: }
1687: }
1688: foreach (split(/\&/,$courserdatas{$cid})) {
1689: my ($name,$value)=split(/\=/,$_);
1690: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1691: &Apache::lonnet::unescape($value);
1692: }
1693: # --------------------------------------------------- Get userdata (if present)
1694: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1695: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1696: if ($reply!~/^error\:/) {
1697: $userrdatas{$uname.'___'.$udom}=$reply;
1698: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1699: }
1700: # check to see if network failed
1701: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1702: {
1703: $self->{NETWORK_FAILURE} = 1;
1704: }
1705: }
1706: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1707: my ($name,$value)=split(/\=/,$_);
1708: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1709: &Apache::lonnet::unescape($value);
1710: }
1.55 bowersj2 1711: $self->{COURSE_OPT} = \%courseopt;
1712: $self->{USER_OPT} = \%useropt;
1.51 bowersj2 1713: }
1714: }
1715:
1.55 bowersj2 1716: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1717: my $cid=$ENV{'request.course.id'};
1718: my ($cdom,$cnum)=split(/\_/,$cid);
1719:
1720: my %emailstatus = &Apache::lonnet::dump('email_status');
1.56 bowersj2 1721: my $logoutTime = $emailstatus{'logout'};
1722: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1.55 bowersj2 1723: $self->{LAST_CHECK} = ($courseLeaveTime > $logoutTime ?
1724: $courseLeaveTime : $logoutTime);
1.56 bowersj2 1725: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1.55 bowersj2 1726: $cdom, $cnum);
1727: my %feedback=();
1728: my %error=();
1729: my $keys = &Apache::lonnet::reply('keys:'.
1730: $ENV{'user.domain'}.':'.
1731: $ENV{'user.name'}.':nohist_email',
1732: $ENV{'user.home'});
1733:
1734: foreach my $msgid (split(/\&/, $keys)) {
1735: $msgid=&Apache::lonnet::unescape($msgid);
1736: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1737: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1738: my ($what,$url)=($1,$2);
1739: my %status=
1740: &Apache::lonnet::get('email_status',[$msgid]);
1741: if ($status{$msgid}=~/^error\:/) {
1742: $status{$msgid}='';
1743: }
1744:
1745: if (($status{$msgid} eq 'new') ||
1746: (!$status{$msgid})) {
1747: if ($what eq 'Error') {
1748: $error{$url}.=','.$msgid;
1749: } else {
1750: $feedback{$url}.=','.$msgid;
1751: }
1752: }
1753: }
1754: }
1755:
1756: $self->{FEEDBACK} = \%feedback;
1757: $self->{ERROR_MSG} = \%error; # what is this? JB
1758: $self->{DISCUSSION_TIME} = \%discussiontime;
1759: $self->{EMAIL_STATUS} = \%emailstatus;
1760:
1761: }
1.84 bowersj2 1762:
1763: $self->{PARM_CACHE} = {};
1.55 bowersj2 1764: }
1.51 bowersj2 1765:
1.55 bowersj2 1766: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1767: sub courseMapDefined {
1768: my $self = shift;
1769: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1770:
1.56 bowersj2 1771: my $firstres = $self->{NAV_HASH}->{"map_start_$uri"};
1772: my $lastres = $self->{NAV_HASH}->{"map_finish_$uri"};
1.55 bowersj2 1773: return $firstres && $lastres;
1.51 bowersj2 1774: }
1775:
1776: sub getIterator {
1777: my $self = shift;
1.98 ! bowersj2 1778: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1.89 bowersj2 1779: shift, undef, shift,
1780: $ENV{'form.direction'});
1.51 bowersj2 1781: return $iterator;
1782: }
1783:
1784: # unties the hash when done
1785: sub untieHashes {
1786: my $self = shift;
1.60 bowersj2 1787: untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
1788: untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
1.51 bowersj2 1789: $self->{HASH_TIED} = 0;
1790: }
1791:
1792: # when the object is destroyed, be sure to untie all the hashes we tied.
1793: sub DESTROY {
1794: my $self = shift;
1795: $self->untieHashes();
1796: }
1797:
1.59 bowersj2 1798: # Private function: Does the given resource (as a symb string) have
1799: # current discussion? Returns 0 if chat/mail data not extracted.
1800: sub hasDiscussion {
1801: my $self = shift;
1802: my $symb = shift;
1803: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1804:
1805: return $self->{DISCUSSION_TIME}->{$symb} >
1.66 bowersj2 1806: $self->{LAST_CHECK};
1.59 bowersj2 1807: }
1808:
1809: # Private function: Does the given resource (as a symb string) have
1810: # current feedback? Returns the string in the feedback hash, which
1811: # will be false if it does not exist.
1812: sub getFeedback {
1813: my $self = shift;
1814: my $symb = shift;
1815:
1816: if (!defined($self->{FEEDBACK})) { return ""; }
1817:
1818: return $self->{FEEDBACK}->{$symb};
1819: }
1820:
1.51 bowersj2 1821: =pod
1822:
1823: =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.
1824:
1825: =cut
1826:
1827: # The strategy here is to cache the resource objects, and only construct them
1828: # as we use them. The real point is to prevent reading any more from the tied
1829: # hash then we have to, which should hopefully alleviate speed problems.
1830: # Caching is just an incidental detail I throw in because it makes sense.
1831:
1832: sub getById {
1833: my $self = shift;
1834: my $id = shift;
1835:
1836: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1837: {
1838: return $self->{RESOURCE_CACHE}->{$id};
1839: }
1840:
1841: # resource handles inserting itself into cache.
1842: return Apache::lonnavmaps::resource->new($self, $id);
1843: }
1844:
1845: =pod
1846:
1847: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
1848:
1849: =cut
1850:
1851: sub firstResource {
1852: my $self = shift;
1853: my $firstResource = $self->{NAV_HASH}->{'map_start_' .
1854: &Apache::lonnet::clutter($ENV{'request.course.uri'})};
1855: return $self->getById($firstResource);
1856: }
1857:
1858: =pod
1859:
1860: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
1861:
1862: =cut
1863:
1864: sub finishResource {
1865: my $self = shift;
1866: my $firstResource = $self->{NAV_HASH}->{'map_finish_' .
1867: &Apache::lonnet::clutter($ENV{'request.course.uri'})};
1868: return $self->getById($firstResource);
1869: }
1870:
1871: # -------------------------------------------- Figure out a cascading parameter
1872: #
1873: # For this function to work
1874: #
1875: # * parmhash needs to be tied
1876: # * courseopt and useropt need to be initialized for this user and course
1877: #
1878:
1879: sub parmval {
1880: my $self = shift;
1881: my ($what,$symb)=@_;
1.84 bowersj2 1882: my $hashkey = $what."|||".$symb;
1883:
1884: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1885: return $self->{PARM_CACHE}->{$hashkey};
1886: }
1887:
1888: my $result = $self->parmval_real($what, $symb);
1889: $self->{PARM_CACHE}->{$hashkey} = $result;
1890: return $result;
1891: }
1892:
1893: sub parmval_real {
1894: my $self = shift;
1895: my ($what,$symb) = @_;
1896:
1.51 bowersj2 1897: my $cid=$ENV{'request.course.id'};
1898: my $csec=$ENV{'request.course.sec'};
1899: my $uname=$ENV{'user.name'};
1900: my $udom=$ENV{'user.domain'};
1901:
1902: unless ($symb) { return ''; }
1903: my $result='';
1904:
1905: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1906:
1907: # ----------------------------------------------------- Cascading lookup scheme
1908: my $rwhat=$what;
1909: $what=~s/^parameter\_//;
1910: $what=~s/\_/\./;
1911:
1912: my $symbparm=$symb.'.'.$what;
1913: my $mapparm=$mapname.'___(all).'.$what;
1914: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1915:
1916: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1917: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1918: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1919:
1920: my $courselevel= $usercourseprefix.'.'.$what;
1921: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1922: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1923:
1924: my $useropt = $self->{USER_OPT};
1925: my $courseopt = $self->{COURSE_OPT};
1926: my $parmhash = $self->{PARM_HASH};
1927:
1928: # ---------------------------------------------------------- first, check user
1929: if ($uname and defined($useropt)) {
1.57 albertel 1930: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1931: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1932: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1.51 bowersj2 1933: }
1934:
1935: # ------------------------------------------------------- second, check course
1936: if ($csec and defined($courseopt)) {
1.57 albertel 1937: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1938: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1939: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1.51 bowersj2 1940: }
1941:
1942: if (defined($courseopt)) {
1.57 albertel 1943: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1944: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1945: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1.51 bowersj2 1946: }
1947:
1948: # ----------------------------------------------------- third, check map parms
1949:
1950: my $thisparm=$$parmhash{$symbparm};
1.57 albertel 1951: if (defined($thisparm)) { return $thisparm; }
1.51 bowersj2 1952:
1953: # ----------------------------------------------------- fourth , check default
1954:
1955: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1.57 albertel 1956: if (defined($default)) { return $default}
1.51 bowersj2 1957:
1958: # --------------------------------------------------- fifth , cascade up parts
1959:
1960: my ($space,@qualifier)=split(/\./,$rwhat);
1961: my $qualifier=join('.',@qualifier);
1962: unless ($space eq '0') {
1963: my ($part,$id)=split(/\_/,$space);
1964: if ($id) {
1965: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1.57 albertel 1966: if (defined($partgeneral)) { return $partgeneral; }
1.51 bowersj2 1967: } else {
1968: my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
1.57 albertel 1969: if (defined($resourcegeneral)) { return $resourcegeneral; }
1.51 bowersj2 1970: }
1971: }
1972: return '';
1973: }
1974:
1975:
1976: 1;
1977:
1978: package Apache::lonnavmaps::iterator;
1979:
1980: # This package must precede "navmap" because "navmap" uses it. In
1981: # order to keep the documentation order straight, the iterator is documented
1982: # after the navmap object.
1983:
1984: =pod
1985:
1986: =back
1987:
1988: =head1 navmap Iterator
1989:
1990: 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.
1991:
1992: 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:
1993:
1994: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1995:
1996: To get the next thing from the iterator, call B<next>:
1997:
1998: C<my $nextThing = $resourceIterator-E<gt>next()>
1999:
2000: getIterator behaves as follows:
2001:
2002: =over 4
2003:
1.89 bowersj2 2004: =item B<getIterator>(firstResource, finishResource, filterHash, condition, direction): 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, which is to say, do not recurse unless explicitly asked to. Direction specifies which direction to recurse, either FORWARD or BACKWARD, with FORWARD being default.
1.51 bowersj2 2005:
1.70 bowersj2 2006: Thus, by default, all resources will be shown. Change the condition to a 1 without changing the hash, and only the top level of the map will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively examine parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively ignore parts of the nav map. See the handler code for examples: By default, the condition is 0 and all folders are closed unless explicitly opened. Clicking "Show All Resources" will use a condition of 1 and an empty filterHash, resulting in all resources being shown.
1.51 bowersj2 2007:
2008: 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:
2009:
2010: =over 4
2011:
1.70 bowersj2 2012: =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
2013:
2014: =item * END_MAP: The map is now done.
2015:
2016: =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
2017:
2018: =item * END_BRANCH: The branch is now done.
1.51 bowersj2 2019:
2020: =back
2021:
1.70 bowersj2 2022: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
2023:
2024: =back
1.51 bowersj2 2025:
2026: =cut
2027:
2028: # Here are the tokens for the iterator:
2029:
2030: sub BEGIN_MAP { return 1; } # begining of a new map
2031: sub END_MAP { return 2; } # end of the map
2032: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2033: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 2034: sub FORWARD { return 1; } # go forward
2035: sub BACKWARD { return 2; }
1.51 bowersj2 2036:
1.96 bowersj2 2037: sub min {
2038: (my $a, my $b) = @_;
2039: if ($a < $b) { return $a; } else { return $b; }
2040: }
2041:
1.94 bowersj2 2042: sub new {
2043: # magic invocation to create a class instance
2044: my $proto = shift;
2045: my $class = ref($proto) || $proto;
2046: my $self = {};
2047:
2048: $self->{NAV_MAP} = shift;
2049: return undef unless ($self->{NAV_MAP});
2050:
2051: # Handle the parameters
2052: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2053: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2054:
2055: # If the given resources are just the ID of the resource, get the
2056: # objects
2057: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2058: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2059: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2060: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2061:
2062: $self->{FILTER} = shift;
2063:
2064: # A hash, used as a set, of resource already seen
2065: $self->{ALREADY_SEEN} = shift;
2066: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2067: $self->{CONDITION} = shift;
2068:
2069: # Now, we need to pre-process the map, by walking forward and backward
2070: # over the parts of the map we're going to look at.
1.96 bowersj2 2071:
1.97 bowersj2 2072: # The processing steps are exactly the same, except for a few small
2073: # changes, so I bundle those up in the following list of two elements:
2074: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2075: # first_resource).
2076: # This prevents writing nearly-identical code twice.
2077: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2078: 'FIRST_RESOURCE'],
2079: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2080: 'FINISH_RESOURCE'] );
2081:
1.98 ! bowersj2 2082: my $maxDepth = 0; # tracks max depth
! 2083:
1.97 bowersj2 2084: foreach my $pass (@iterations) {
2085: my $direction = $pass->[0];
2086: my $valName = $pass->[1];
2087: my $nextResourceMethod = $pass->[2];
2088: my $firstResourceName = $pass->[3];
2089:
2090: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2091: $self->{FIRST_RESOURCE},
2092: $self->{FINISH_RESOURCE},
2093: {}, undef, 0, $direction);
1.96 bowersj2 2094:
1.97 bowersj2 2095: # prime the recursion
2096: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 ! bowersj2 2097: my $depth = 0;
1.97 bowersj2 2098: $iterator->next();
2099: my $curRes = $iterator->next();
1.98 ! bowersj2 2100: while ($depth > -1) {
1.97 bowersj2 2101: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2102: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 2103:
1.97 bowersj2 2104: if (ref($curRes)) {
2105: my $resultingVal = $curRes->{DATA}->{$valName};
2106: my $nextResources = $curRes->$nextResourceMethod();
2107: my $resourceCount = scalar(@{$nextResources});
1.96 bowersj2 2108:
1.97 bowersj2 2109: if ($resourceCount == 1) {
2110: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2111: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2112: }
2113:
2114: if ($resourceCount > 1) {
2115: foreach my $res (@{$nextResources}) {
2116: my $current = $res->{DATA}->{$valName} || 999999999;
2117: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2118: }
2119: }
2120: }
2121: if (ref($curRes) && $curRes->is_map() && $direction == FORWARD()) {
2122: my $firstResource = $curRes->map_start();
2123: my $finishResource = $curRes->map_finish();
2124: my $newIterator = Apache::lonnavmaps::iterator->new($self->{NAV_MAP},
2125: $firstResource,
2126: $finishResource,
2127: $self->{FILTER},
2128: $self->{ALREADY_SEEN},
2129: $self->{CONDITION});
1.96 bowersj2 2130: }
2131:
1.97 bowersj2 2132: # Assign the final val
2133: if (ref($curRes) && $direction == BACKWARD()) {
1.98 ! bowersj2 2134: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
! 2135: $curRes->{DATA}->{BOT_UP_VAL});
! 2136:
! 2137: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
! 2138: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
! 2139: }
1.97 bowersj2 2140: $curRes = $iterator->next();
1.96 bowersj2 2141: }
2142: }
1.94 bowersj2 2143:
1.98 ! bowersj2 2144: # Set up some bookkeeping information.
! 2145: $self->{CURRENT_DEPTH} = 0;
! 2146: $self->{MAX_DEPTH} = $maxDepth;
! 2147: $self->{STACK} = [];
! 2148: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
! 2149:
! 2150: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
! 2151: push @{$self->{STACK}}, [];
! 2152: }
! 2153:
! 2154: # Prime the recursion w/ the first resource
! 2155: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
! 2156: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
! 2157:
! 2158: bless ($self);
! 2159:
! 2160: return $self;
! 2161: }
! 2162:
! 2163: sub next {
! 2164: my $self = shift;
! 2165:
! 2166: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
! 2167: # grab the next from the recursive iterator
! 2168: my $next = $self->{RECURSIVE_ITERATOR}->next();
! 2169:
! 2170: # is it a begin or end map? If so, update the depth
! 2171: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
! 2172: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
! 2173:
! 2174: # Are we back at depth 0? If so, stop recursing
! 2175: if ($self->{RECURSIVE_DEPTH} == 0) {
! 2176: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
! 2177: }
! 2178:
! 2179: return $next;
! 2180: }
! 2181:
! 2182: if (defined($self->{FORCE_NEXT})) {
! 2183: my $tmp = $self->{FORCE_NEXT};
! 2184: $self->{FORCE_NEXT} = undef;
! 2185: return $tmp;
! 2186: }
! 2187:
! 2188: # Have we not yet begun? If not, return BEGIN_MAP and
! 2189: # remember we've started.
! 2190: if ( !$self->{STARTED} ) {
! 2191: $self->{STARTED} = 1;
! 2192: return $self->BEGIN_MAP();
! 2193: }
! 2194:
! 2195: # Here's the guts of the iterator.
! 2196:
! 2197: # Find the next resource, if any.
! 2198: my $found = 0;
! 2199: my $i = $self->{MAX_DEPTH};
! 2200: my $newDepth;
! 2201: my $here;
! 2202: while ( $i >= 0 && !$found ) {
! 2203: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) {
! 2204: $here = $self->{HERE} = shift @{$self->{STACK}->[$i]};
! 2205: $found = 1;
! 2206: $newDepth = $i;
! 2207: }
! 2208: $i--;
! 2209: }
! 2210:
! 2211: # If we still didn't find anything, we're done.
! 2212: if ( !$found ) {
! 2213: # We need to get back down to the correct branch depth
! 2214: if ( $self->{CURRENT_DEPTH} > 0 ) {
! 2215: $self->{CURRENT_DEPTH}--;
! 2216: return END_BRANCH();
! 2217: } else {
! 2218: return END_MAP();
! 2219: }
! 2220: }
! 2221:
! 2222: # Get to the right level
! 2223: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
! 2224: push @{$self->{STACK}->[$newDepth]}, $here;
! 2225: $self->{CURRENT_DEPTH}--;
! 2226: return END_BRANCH();
! 2227: }
! 2228: if ( $self->{CURRENT_DEPTH} < $newDepth) {
! 2229: push @{$self->{STACK}->[$newDepth]}, $here;
! 2230: $self->{CURRENT_DEPTH}++;
! 2231: return BEGIN_BRANCH();
! 2232: }
! 2233:
! 2234: # If we made it here, we have the next resource, and we're at the
! 2235: # right branch level. So let's examine the resource for where
! 2236: # we can get to from here.
! 2237:
! 2238: # So we need to look at all the resources we can get to from here,
! 2239: # categorize them if we haven't seen them, remember if we have a new
! 2240: my $nextUnfiltered = $here->getNext();
! 2241:
! 2242: for (@$nextUnfiltered) {
! 2243: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
! 2244: push @{$self->{STACK}->[$_->{DATA}->{DISPLAY_DEPTH}]}, $_;
! 2245: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
! 2246: }
! 2247: }
! 2248:
! 2249: # That ends the main iterator logic. Now, do we want to recurse
! 2250: # down this map (if this resource is a map)?
! 2251: if ($self->{HERE}->is_map() &&
! 2252: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
! 2253: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
! 2254: my $firstResource = $self->{HERE}->map_start();
! 2255: my $finishResource = $self->{HERE}->map_finish();
! 2256:
! 2257: $self->{RECURSIVE_ITERATOR} =
! 2258: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
! 2259: $finishResource, $self->{FILTER},
! 2260: $self->{ALREADY_SEEN}, $self->{CONDITION});
! 2261: }
! 2262:
! 2263: return $self->{HERE};
! 2264:
! 2265: }
! 2266:
! 2267: =pod
! 2268:
! 2269: 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).
! 2270:
! 2271: =cut
! 2272:
! 2273: sub getStack {
! 2274: my $self=shift;
! 2275:
! 2276: my @stack;
! 2277:
! 2278: $self->populateStack(\@stack);
! 2279:
! 2280: return \@stack;
! 2281: }
! 2282:
! 2283: # Private method: Calls the iterators recursively to populate the stack.
! 2284: sub populateStack {
! 2285: my $self=shift;
! 2286: my $stack = shift;
! 2287:
! 2288: push @$stack, $self->{HERE} if ($self->{HERE});
! 2289:
! 2290: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
! 2291: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
! 2292: }
1.94 bowersj2 2293: }
2294:
2295: 1;
2296:
2297: package Apache::lonnavmaps::DFSiterator;
2298:
2299: # UNDOCUMENTED: This is a private library, it should not generally be used
2300: # by the outside world. What it does is walk through the nav map in a
2301: # depth-first fashion. This is not appropriate for most uses, but it is
2302: # used by the main iterator for pre-processing. It also is able to isolate
2303: # much of the complexity of the main iterator, so the main iterator is much
2304: # simpler.
1.97 bowersj2 2305: # There is no real benefit in merging the main iterator and this one into one class...
2306: # all the logic in DFSiterator would need to be replicated, you gain no performance,
2307: # at best, you just make one massively complicated iterator in place of two
2308: # somewhat complicated ones. ;-) - Jeremy
1.94 bowersj2 2309:
2310: # Here are the tokens for the iterator, replicated from iterator for convenience:
2311:
2312: sub BEGIN_MAP { return 1; } # begining of a new map
2313: sub END_MAP { return 2; } # end of the map
2314: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2315: sub END_BRANCH { return 4; } # end of a branch
2316: sub FORWARD { return 1; } # go forward
2317: sub BACKWARD { return 2; }
2318:
1.51 bowersj2 2319: # Params: nav map, start resource, end resource, filter, condition,
2320: # already seen hash ref
2321:
2322: sub new {
2323: # magic invocation to create a class instance
2324: my $proto = shift;
2325: my $class = ref($proto) || $proto;
2326: my $self = {};
2327:
2328: $self->{NAV_MAP} = shift;
2329: return undef unless ($self->{NAV_MAP});
2330:
2331: # Handle the parameters
2332: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2333: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2334:
2335: # If the given resources are just the ID of the resource, get the
2336: # objects
2337: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2338: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2339: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2340: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2341:
2342: $self->{FILTER} = shift;
2343:
2344: # A hash, used as a set, of resource already seen
2345: $self->{ALREADY_SEEN} = shift;
2346: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 2347: $self->{CONDITION} = shift;
1.89 bowersj2 2348: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 2349:
2350: # Flag: Have we started yet? If not, the first action is to return BEGIN_MAP.
2351: $self->{STARTED} = 0;
2352:
2353: # Should we continue calling the recursive iterator, if any?
2354: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2355: # The recursive iterator, if any
2356: $self->{RECURSIVE_ITERATOR} = undef;
2357: # Are we recursing on a map, or a branch?
2358: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2359: # And the count of how deep it is, so that this iterator can keep track of
2360: # when to pick back up again.
2361: $self->{RECURSIVE_DEPTH} = 0;
2362:
2363: # For keeping track of our branches, we maintain our own stack
2364: $self->{BRANCH_STACK} = [];
2365: # If the size shrinks, we exhausted a branch
2366: $self->{BRANCH_STACK_SIZE} = 0;
2367: $self->{BRANCH_DEPTH} = 0;
2368:
2369: # For returning two things in a forced sequence
2370: $self->{FORCE_NEXT} = undef;
2371:
2372: # Start with the first resource
1.89 bowersj2 2373: if ($self->{DIRECTION} == FORWARD) {
2374: push @{$self->{BRANCH_STACK}}, $self->{FIRST_RESOURCE};
2375: } else {
1.90 bowersj2 2376: push @{$self->{BRANCH_STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 2377: }
1.51 bowersj2 2378: $self->{BRANCH_STACK_SIZE} = 1;
2379:
2380: bless($self);
2381: return $self;
2382: }
2383:
2384: # Note... this function is *touchy*. I strongly recommend tracing
2385: # through it with the debugger a few times on a non-trivial map before
2386: # modifying it. Order is *everything*.
2387: sub next {
2388: my $self = shift;
2389:
2390: # Iterator logic goes here
2391:
2392: # Are we using a recursive iterator? If so, pull from that and
2393: # watch the depth; we want to resume our level at the correct time.
1.98 ! bowersj2 2394: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 2395: # grab the next from the recursive iterator
2396: my $next = $self->{RECURSIVE_ITERATOR}->next();
2397:
2398: # is it a begin or end map? Update depth if so
2399: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2400: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2401:
2402: # Are we back at depth 0? If so, stop recursing.
2403: if ($self->{RECURSIVE_DEPTH} == 0) {
2404: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2405: }
2406:
2407: return $next;
2408: }
2409:
1.68 bowersj2 2410: # Is this return value pre-determined?
2411: if (defined($self->{FORCE_NEXT})) {
2412: my $tmp = $self->{FORCE_NEXT};
2413: $self->{FORCE_NEXT} = undef;
2414: return $tmp;
2415: }
2416:
1.51 bowersj2 2417: # Is there a current resource to grab? If not, then return
2418: # END_BRANCH and END_MAP in succession.
2419: if (scalar(@{$self->{BRANCH_STACK}}) == 0) {
2420: if ($self->{BRANCH_DEPTH} > 0) {
2421: $self->{FORCE_NEXT} = $self->END_MAP();
1.52 bowersj2 2422: $self->{BRANCH_DEPTH}--;
1.51 bowersj2 2423: return $self->END_BRANCH();
2424: } else {
2425: return $self->END_MAP();
2426: }
2427: }
2428:
2429: # Have we not yet begun? If not, return BEGIN_MAP and
2430: # remember that we've started.
2431: if ( !$self->{STARTED} ) {
2432: $self->{STARTED} = 1;
2433: return $self->BEGIN_MAP;
2434: }
2435:
2436: # Did the branch stack shrink since last run? If so,
2437: # we exhausted a branch last time, therefore, we're about
2438: # to start a new one. (We know because we already checked to see
2439: # if the stack was empty.)
2440: if ( scalar (@{$self->{BRANCH_STACK}}) < $self->{BRANCH_STACK_SIZE}) {
1.52 bowersj2 2441: $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}});
2442: $self->{BRANCH_DEPTH}++;
2443: return $self->BEGIN_BRANCH();
1.51 bowersj2 2444: }
2445:
1.52 bowersj2 2446: # Remember the size for comparision next time.
2447: $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}});
2448:
2449: # If the next resource we mean to return is going to need
2450: # a lower branch level, terminate branches until we get
2451: # there.
2452:
1.51 bowersj2 2453: # Get the next resource in the branch
2454: $self->{HERE} = pop @{$self->{BRANCH_STACK}};
1.52 bowersj2 2455:
2456: # Are we at the right depth? If not, close a branch and return
2457: # the current resource onto the branch stack
1.98 ! bowersj2 2458: # Note: There seems to be some bugs here, so don't rely
! 2459: # on this, use the real iterator instead.
1.52 bowersj2 2460: if (defined($self->{HERE}->{DATA}->{ITERATOR_DEPTH})
2461: && $self->{HERE}->{DATA}->{ITERATOR_DEPTH} <
2462: $self->{BRANCH_DEPTH} ) {
2463: $self->{BRANCH_DEPTH}--;
2464: # return it so we can pick it up eventually
2465: push @{$self->{BRANCH_STACK}}, $self->{HERE};
2466: return $self->END_BRANCH();
2467: }
2468:
1.51 bowersj2 2469: # We always return it after this point and never before
2470: # (proof: look at just the return statements), so we
2471: # remember that we've seen this.
2472: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2473:
2474: # Get the next possible resources
1.90 bowersj2 2475: my $nextUnfiltered;
1.89 bowersj2 2476: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 2477: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 2478: } else {
1.90 bowersj2 2479: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 2480: }
1.51 bowersj2 2481: my $next = [];
2482:
2483: # filter the next possibilities to remove things we've
1.52 bowersj2 2484: # already seen. Also, remember what branch depth they should
2485: # be displayed at, since there's no other reliable way to tell.
1.51 bowersj2 2486: foreach (@$nextUnfiltered) {
1.52 bowersj2 2487: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2488: push @$next, $_;
2489: $_->{DATA}->{ITERATOR_DEPTH} =
2490: $self->{BRANCH_DEPTH} + 1;
2491: }
1.51 bowersj2 2492: }
2493:
2494: # Handle branch cases:
2495: # Nothing is available next: BRANCH_END
2496: # 1 thing next: standard non-branch
2497: # 2+ things next: have some branches
2498: my $nextCount = scalar(@$next);
2499: if ($nextCount == 0) {
1.52 bowersj2 2500: # Return this and on the next run, close the branch up if we're
2501: # in a branch
2502: if ($self->{BRANCH_DEPTH} > 0 ) {
2503: $self->{FORCE_NEXT} = $self->END_BRANCH();
2504: $self->{BRANCH_DEPTH}--;
2505: }
1.51 bowersj2 2506: }
2507:
2508: while (@$next) {
2509: # copy the next possibilities over to the branch stack
2510: # in the right order
1.52 bowersj2 2511: push @{$self->{BRANCH_STACK}}, shift @$next;
1.51 bowersj2 2512: }
2513:
2514: if ($nextCount >= 2) {
1.52 bowersj2 2515: $self->{FORCE_NEXT} = $self->BEGIN_BRANCH();
2516: $self->{BRANCH_DEPTH}++;
1.51 bowersj2 2517: return $self->{HERE};
2518: }
2519:
2520: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 2521: if ($self->{HERE}->is_map() &&
1.63 bowersj2 2522: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 2523: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2524: my $firstResource = $self->{HERE}->map_start();
2525: my $finishResource = $self->{HERE}->map_finish();
2526:
2527: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 2528: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 2529: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 2530: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 2531: }
2532:
2533: return $self->{HERE};
2534: }
2535:
2536: sub getStack {
2537: my $self=shift;
2538:
2539: my @stack;
2540:
2541: $self->populateStack(\@stack);
2542:
2543: return \@stack;
2544: }
2545:
2546: # Private method: Calls the iterators recursively to populate the stack.
2547: sub populateStack {
2548: my $self=shift;
2549: my $stack = shift;
2550:
1.88 bowersj2 2551: push @$stack, $self->{HERE} if ($self->{HERE});
1.51 bowersj2 2552:
2553: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2554: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2555: }
2556: }
2557:
1.1 www 2558: 1;
1.2 www 2559:
1.51 bowersj2 2560: package Apache::lonnavmaps::resource;
2561:
2562: use Apache::lonnet;
2563:
2564: =pod
2565:
2566: =head1 Object: resource
2567:
2568: 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.
2569:
2570: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
2571:
2572: You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.
2573:
2574: =head2 Public Members
2575:
2576: 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.
2577:
2578: =head2 Methods
2579:
2580: =over 4
2581:
1.70 bowersj2 2582: =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.
2583:
2584: =back
1.51 bowersj2 2585:
2586: =cut
2587:
2588: sub new {
2589: # magic invocation to create a class instance
2590: my $proto = shift;
2591: my $class = ref($proto) || $proto;
2592: my $self = {};
2593:
2594: $self->{NAV_MAP} = shift;
2595: $self->{ID} = shift;
2596:
2597: # Store this new resource in the parent nav map's cache.
2598: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 2599: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 2600:
2601: # A hash that can be used by two-pass algorithms to store data
2602: # about this resource in. Not used by the resource object
2603: # directly.
2604: $self->{DATA} = {};
2605:
2606: bless($self);
2607:
2608: return $self;
2609: }
2610:
1.70 bowersj2 2611: # private function: simplify the NAV_HASH lookups we keep doing
2612: # pass the name, and to automatically append my ID, pass a true val on the
2613: # second param
2614: sub navHash {
2615: my $self = shift;
2616: my $param = shift;
2617: my $id = shift;
2618: return $self->{NAV_MAP}->{NAV_HASH}->{$param . ($id?$self->{ID}:"")};
2619: }
2620:
1.51 bowersj2 2621: =pod
2622:
1.70 bowersj2 2623: B<Metadata Retreival>
2624:
2625: These are methods that help you retrieve metadata about the resource:
2626:
2627: =over 4
2628:
2629: =item * B<ext>: Returns true if the resource is external.
2630:
2631: =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
2632:
2633: =item * B<kind>: Returns the kind of the resource from the compiled nav map.
2634:
2635: =item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature.
1.51 bowersj2 2636:
1.70 bowersj2 2637: =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
2638:
2639: =item * B<src>: Returns the source for the resource.
2640:
2641: =item * B<symb>: Returns the symb for the resource.
2642:
2643: =item * B<title>: Returns the title of the resource.
2644:
2645: =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 2646:
2647: =back
2648:
2649: =cut
2650:
2651: # These info functions can be used directly, as they don't return
2652: # resource information.
1.85 bowersj2 2653: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 2654: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 2655: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 2656: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2657: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 2658: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2659: sub randompick {
2660: my $self = shift;
2661: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2662: '.0.parameter_randompick'};
2663: }
1.51 bowersj2 2664: sub src {
2665: my $self=shift;
2666: return $self->navHash("src_", 1);
2667: }
2668: sub symb {
2669: my $self=shift;
2670: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2671: my $symbSrc = &Apache::lonnet::declutter($self->src());
2672: return &Apache::lonnet::declutter(
2673: $self->navHash('map_id_'.$first))
2674: . '___' . $second . '___' . $symbSrc;
2675: }
1.70 bowersj2 2676: sub title { my $self=shift; return $self->navHash("title_", 1); }
2677: sub to { my $self=shift; return $self->navHash("to_", 1); }
2678:
2679: =pod
2680:
2681: B<Predicate Testing the Resource>
2682:
2683: These methods are shortcuts to deciding if a given resource has a given property.
2684:
2685: =over 4
2686:
2687: =item * B<is_map>: Returns true if the resource is a map type.
2688:
2689: =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.)
2690:
2691: =item * B<is_page>: Returns true if the resource is a page.
2692:
2693: =item * B<is_problem>: Returns true if the resource is a problem.
2694:
2695: =item * B<is_sequence>: Returns true if the resource sequence.
2696:
2697: =back
2698:
2699: =cut
2700:
2701:
2702: sub is_html {
1.51 bowersj2 2703: my $self=shift;
2704: my $src = $self->src();
1.70 bowersj2 2705: return ($src =~ /html$/);
1.51 bowersj2 2706: }
1.70 bowersj2 2707: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2708: sub is_page {
1.51 bowersj2 2709: my $self=shift;
2710: my $src = $self->src();
1.70 bowersj2 2711: return ($src =~ /page$/);
1.51 bowersj2 2712: }
1.70 bowersj2 2713: sub is_problem {
1.51 bowersj2 2714: my $self=shift;
2715: my $src = $self->src();
1.70 bowersj2 2716: return ($src =~ /problem$/);
1.51 bowersj2 2717: }
1.70 bowersj2 2718: sub is_sequence {
1.51 bowersj2 2719: my $self=shift;
2720: my $src = $self->src();
1.70 bowersj2 2721: return ($src =~ /sequence$/);
1.51 bowersj2 2722: }
2723:
2724:
2725:
2726:
1.70 bowersj2 2727:
1.51 bowersj2 2728: # Move this into POD: In order to use these correctly, courseopt
2729: # and useropt need to be generated
2730: sub parmval {
2731: my $self = shift;
2732: my $what = shift;
2733: my $part = shift || "0";
2734: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2735: }
2736:
1.70 bowersj2 2737: =pod
2738:
2739: B<Map Methods>
2740:
2741: These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
2742:
2743: =over 4
2744:
2745: =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
2746:
2747: =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.
2748:
2749: =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
2750:
2751: =item * B<map_type>: Returns a string with the type of the map in it.
2752:
2753: =back
1.51 bowersj2 2754:
1.70 bowersj2 2755: =cut
1.51 bowersj2 2756:
2757: sub map_finish {
2758: my $self = shift;
2759: my $src = $self->src();
2760: my $res = $self->navHash("map_finish_$src", 0);
2761: $res = $self->{NAV_MAP}->getById($res);
2762: return $res;
2763: }
1.70 bowersj2 2764: sub map_pc {
2765: my $self = shift;
2766: my $src = $self->src();
2767: return $self->navHash("map_pc_$src", 0);
2768: }
1.51 bowersj2 2769: sub map_start {
2770: my $self = shift;
2771: my $src = $self->src();
2772: my $res = $self->navHash("map_start_$src", 0);
2773: $res = $self->{NAV_MAP}->getById($res);
2774: return $res;
2775: }
2776: sub map_type {
2777: my $self = shift;
2778: my $pc = $self->map_pc();
2779: return $self->navHash("map_type_$pc", 0);
2780: }
2781:
2782:
2783:
2784: #####
2785: # Property queries
2786: #####
2787:
2788: # These functions will be responsible for returning the CORRECT
2789: # VALUE for the parameter, no matter what. So while they may look
2790: # like direct calls to parmval, they can be more then that.
2791: # So, for instance, the duedate function should use the "duedatetype"
2792: # information, rather then the resource object user.
2793:
2794: =pod
2795:
2796: =head2 Resource Parameters
2797:
1.70 bowersj2 2798: 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 2799:
2800: 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.)
2801:
2802: =over 4
2803:
2804: =item * B<acc>: Get the Client IP/Name Access Control information.
2805:
2806: =item * B<answerdate>: Get the answer-reveal date for the problem.
2807:
2808: =item * B<duedate>: Get the due date for the problem.
2809:
2810: =item * B<tries>: Get the number of tries the student has used on the problem.
2811:
2812: =item * B<maxtries>: Get the number of max tries allowed.
2813:
2814: =item * B<opendate>: Get the open date for the problem.
2815:
2816: =item * B<sig>: Get the significant figures setting.
2817:
2818: =item * B<tol>: Get the tolerance for the problem.
2819:
1.70 bowersj2 2820: =item * B<tries>: Get the number of tries the user has already used on the problem.
2821:
1.51 bowersj2 2822: =item * B<type>: Get the question type for the problem.
2823:
2824: =item * B<weight>: Get the weight for the problem.
2825:
2826: =back
2827:
2828: =cut
2829:
2830: sub acc {
2831: (my $self, my $part) = @_;
2832: return $self->parmval("acc", $part);
2833: }
2834: sub answerdate {
2835: (my $self, my $part) = @_;
2836: # Handle intervals
2837: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2838: return $self->duedate($part) +
2839: $self->parmval("answerdate", $part);
2840: }
2841: return $self->parmval("answerdate", $part);
2842: }
2843: sub duedate {
2844: (my $self, my $part) = @_;
2845: return $self->parmval("duedate", $part);
2846: }
2847: sub maxtries {
2848: (my $self, my $part) = @_;
2849: return $self->parmval("maxtries", $part);
2850: }
2851: sub opendate {
2852: (my $self, my $part) = @_;
2853: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2854: return $self->duedate($part) -
2855: $self->parmval("opendate", $part);
2856: }
2857: return $self->parmval("opendate");
2858: }
2859: sub sig {
2860: (my $self, my $part) = @_;
2861: return $self->parmval("sig", $part);
2862: }
2863: sub tol {
2864: (my $self, my $part) = @_;
2865: return $self->parmval("tol", $part);
2866: }
2867: sub tries {
2868: my $self = shift;
2869: my $part = shift;
2870: $part = '0' if (!defined($part));
2871:
2872: # Make sure return hash is loaded, should error check
2873: $self->getReturnHash();
2874:
2875: my $tries = $self->{RETURN_HASH}->{'resource.'.$part.'.tries'};
2876: if (!defined($tries)) {return '0';}
2877: return $tries;
2878: }
1.70 bowersj2 2879: sub type {
2880: (my $self, my $part) = @_;
2881: return $self->parmval("type", $part);
2882: }
2883: sub weight {
2884: (my $self, my $part) = @_;
2885: return $self->parmval("weight", $part);
2886: }
1.51 bowersj2 2887:
2888: # Multiple things need this
2889: sub getReturnHash {
2890: my $self = shift;
2891:
2892: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 2893: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 2894: $self->{RETURN_HASH} = \%tmpHash;
2895: }
2896: }
2897:
2898: ######
2899: # Status queries
2900: ######
2901:
2902: # These methods query the status of problems.
2903:
2904: # If we need to count parts, this function determines the number of
2905: # parts from the metadata. When called, it returns a reference to a list
2906: # of strings corresponding to the parts. (Thus, using it in a scalar context
2907: # tells you how many parts you have in the problem:
2908: # $partcount = scalar($resource->countParts());
2909: # Don't use $self->{PARTS} directly because you don't know if it's been
2910: # computed yet.
2911:
2912: =pod
2913:
2914: =head2 Resource misc
2915:
2916: Misc. functions for the resource.
2917:
2918: =over 4
2919:
1.59 bowersj2 2920: =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.
2921:
2922: =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:
2923:
2924: for (split(/\,/, $res->getFeedback())) {
2925: my $link = &Apache::lonnet::escape($_);
2926: ...
2927:
2928: and use the link as appropriate.
2929:
2930: =cut
2931:
2932: sub hasDiscussion {
2933: my $self = shift;
2934: return $self->{NAV_MAP}->hasDiscussion($self->symb());
2935: }
2936:
2937: sub getFeedback {
2938: my $self = shift;
1.85 bowersj2 2939: return $self->{NAV_MAP}->getFeedback($self->src());
1.59 bowersj2 2940: }
2941:
2942: =pod
2943:
1.70 bowersj2 2944: =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 2945:
1.70 bowersj2 2946: =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 2947:
2948: =back
2949:
2950: =cut
2951:
2952: sub parts {
2953: my $self = shift;
2954:
1.67 bowersj2 2955: if ($self->ext) { return ['0']; }
2956:
1.51 bowersj2 2957: $self->extractParts();
2958: return $self->{PARTS};
2959: }
2960:
2961: sub countParts {
2962: my $self = shift;
2963:
2964: my $parts = $self->parts();
1.66 bowersj2 2965:
2966: if ($self->{RESOURCE_ERROR}) {
2967: return 0;
2968: }
2969:
2970: if (scalar(@{$parts}) < 2) { return 1;}
1.51 bowersj2 2971:
2972: return scalar(@{$parts}) - 1;
2973: }
2974:
2975: # Private function: Extracts the parts information and saves it
2976: sub extractParts {
2977: my $self = shift;
2978:
2979: return if ($self->{PARTS});
1.67 bowersj2 2980: return if ($self->ext);
1.51 bowersj2 2981:
2982: $self->{PARTS} = [];
2983:
1.82 bowersj2 2984: # Retrieve part count, if this is a problem
2985: if ($self->is_problem()) {
2986: my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys');
2987: if (!$metadata) {
2988: $self->{RESOURCE_ERROR} = 1;
2989: $self->{PARTS} = [];
2990: return;
2991: }
2992:
2993: foreach (split(/\,/,$metadata)) {
2994: if ($_ =~ /^parameter\_(.*)\_opendate$/) {
2995: push @{$self->{PARTS}}, $1;
2996: }
1.51 bowersj2 2997: }
1.82 bowersj2 2998:
2999:
3000: # Is this possible to do in one line? - Jeremy
3001: my @sortedParts = sort @{$self->{PARTS}};
3002: $self->{PARTS} = \@sortedParts;
1.51 bowersj2 3003: }
3004:
3005: return;
3006: }
3007:
3008: =pod
3009:
3010: =head2 Resource Status
3011:
3012: Problem resources have status information, reflecting their various dates and completion statuses. You can obtain this information and import symbolic constants to represent the status.
3013:
3014: There are two aspects to the status: the date-related information and the completion information.
3015:
3016: Idiomatic usage of these two methods would probably look something like
3017:
3018: foreach ($resource->parts()) {
3019: my $dateStatus = $resource->getDateStatus($_);
3020: my $completionStatus = $resource->getCompletionStatus($_);
3021:
1.70 bowersj2 3022: or
3023:
3024: my $status = $resource->status($_);
3025:
1.51 bowersj2 3026: ... use it here ...
3027: }
3028:
3029: =over 4
3030:
1.70 bowersj2 3031: =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 3032:
3033: =back
3034:
3035: B<Date Codes>
3036:
3037: =over 4
3038:
3039: =item * B<OPEN_LATER>: The problem will be opened later.
3040:
3041: =item * B<OPEN>: Open and not yet due.
3042:
1.59 bowersj2 3043:
1.54 bowersj2 3044: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
3045:
3046: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51 bowersj2 3047:
3048: =item * B<ANSWER_OPEN>: The answer date is here.
3049:
3050: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
3051:
3052: =back
3053:
3054: =cut
3055:
3056: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 3057: sub OPEN_LATER { return 0; }
3058: sub OPEN { return 1; }
3059: sub PAST_DUE_NO_ANSWER { return 2; }
3060: sub PAST_DUE_ANSWER_LATER { return 3; }
3061: sub ANSWER_OPEN { return 4; }
3062: sub NOTHING_SET { return 5; }
3063: sub NETWORK_FAILURE { return 100; }
3064:
3065: # getDateStatus gets the date status for a given problem part.
3066: # Because answer date, due date, and open date are fully independent
3067: # (i.e., it is perfectly possible to *only* have an answer date),
3068: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3069: # (past, future, none given). This function handles this with a decision
3070: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 3071:
3072: sub getDateStatus {
3073: my $self = shift;
3074: my $part = shift;
3075: $part = "0" if (!defined($part));
1.54 bowersj2 3076:
3077: # Always return network failure if there was one.
1.51 bowersj2 3078: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3079:
3080: my $now = time();
3081:
1.53 bowersj2 3082: my $open = $self->opendate($part);
3083: my $due = $self->duedate($part);
3084: my $answer = $self->answerdate($part);
3085:
3086: if (!$open && !$due && !$answer) {
3087: # no data on the problem at all
3088: # should this be the same as "open later"? think multipart.
3089: return $self->NOTHING_SET;
3090: }
1.59 bowersj2 3091: if (!$open || $now < $open) {return $self->OPEN_LATER}
3092: if (!$due || $now < $due) {return $self->OPEN}
3093: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3094: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 3095: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 3096: }
3097:
3098: =pod
3099:
3100: B<>
3101:
3102: =over 4
3103:
3104: =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:
3105:
3106: =back
3107:
3108: B<Completion Codes>
3109:
3110: =over 4
3111:
3112: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
3113:
3114: =item * B<INCORRECT>: Attempted, but wrong by student.
3115:
3116: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
3117:
3118: =item * B<CORRECT>: Correct or correct by instructor.
3119:
3120: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
3121:
3122: =item * B<EXCUSED>: Excused. Not yet implemented.
3123:
3124: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
3125:
1.69 bowersj2 3126: =item * B<ATTEMPTED>: Attempted, and not yet graded.
3127:
1.51 bowersj2 3128: =back
3129:
3130: =cut
3131:
1.53 bowersj2 3132: sub NOT_ATTEMPTED { return 10; }
3133: sub INCORRECT { return 11; }
3134: sub INCORRECT_BY_OVERRIDE { return 12; }
3135: sub CORRECT { return 13; }
3136: sub CORRECT_BY_OVERRIDE { return 14; }
3137: sub EXCUSED { return 15; }
1.69 bowersj2 3138: sub ATTEMPTED { return 16; }
1.51 bowersj2 3139:
3140: sub getCompletionStatus {
3141: my $self = shift;
3142: my $part = shift;
3143: $part = "0" if (!defined($part));
3144: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3145:
3146: # Make sure return hash exists
3147: $self->getReturnHash();
3148:
3149: my $status = $self->{RETURN_HASH}->{'resource.'.$part.'.solved'};
3150:
3151: # Left as seperate if statements in case we ever do more with this
3152: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3153: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3154: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3155: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3156: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 3157: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 3158: return $self->NOT_ATTEMPTED;
3159: }
3160:
3161: =pod
3162:
3163: B<Composite Status>
3164:
3165: 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()):
3166:
3167: =over 4
3168:
1.70 bowersj2 3169: =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
1.51 bowersj2 3170:
1.70 bowersj2 3171: =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 3172:
1.70 bowersj2 3173: =item * B<CORRECT>: For any reason at all, the part is considered correct.
1.51 bowersj2 3174:
1.70 bowersj2 3175: =item * B<EXCUSED>: For any reason at all, the problem is excused.
1.51 bowersj2 3176:
1.70 bowersj2 3177: =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
1.54 bowersj2 3178:
1.70 bowersj2 3179: =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 3180:
1.70 bowersj2 3181: =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
1.51 bowersj2 3182:
1.70 bowersj2 3183: =item * B<OPEN_LATER>: The problem is not yet open.
1.51 bowersj2 3184:
1.70 bowersj2 3185: =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
1.51 bowersj2 3186:
1.70 bowersj2 3187: =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
1.51 bowersj2 3188:
1.70 bowersj2 3189: =item * B<OPEN>: The item is open and not yet tried.
1.51 bowersj2 3190:
1.70 bowersj2 3191: =item * B<ATTEMPTED>: The problem has been attempted.
1.69 bowersj2 3192:
1.51 bowersj2 3193: =back
3194:
3195: =cut
3196:
3197: sub TRIES_LEFT { return 10; }
3198:
3199: sub status {
3200: my $self = shift;
3201: my $part = shift;
3202: if (!defined($part)) { $part = "0"; }
3203: my $completionStatus = $self->getCompletionStatus($part);
3204: my $dateStatus = $self->getDateStatus($part);
3205:
3206: # What we have is a two-dimensional matrix with 4 entries on one
3207: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 3208: # plus network failure and "no date data at all".
1.51 bowersj2 3209:
1.53 bowersj2 3210: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 3211:
3212: # There are a few whole rows we can dispose of:
1.53 bowersj2 3213: if ($completionStatus == CORRECT ||
3214: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.69 bowersj2 3215: return CORRECT;
3216: }
3217:
3218: if ($completionStatus == ATTEMPTED) {
3219: return ATTEMPTED;
1.53 bowersj2 3220: }
3221:
3222: # If it's EXCUSED, then return that no matter what
3223: if ($completionStatus == EXCUSED) {
3224: return EXCUSED;
1.51 bowersj2 3225: }
3226:
1.53 bowersj2 3227: if ($dateStatus == NOTHING_SET) {
3228: return NOTHING_SET;
1.51 bowersj2 3229: }
3230:
1.69 bowersj2 3231: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3232: # by 4 matrix (date statuses).
1.51 bowersj2 3233:
1.54 bowersj2 3234: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 3235: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 3236: return $dateStatus;
1.51 bowersj2 3237: }
3238:
1.53 bowersj2 3239: if ($dateStatus == ANSWER_OPEN) {
3240: return ANSWER_OPEN;
1.51 bowersj2 3241: }
3242:
3243: # Now: (incorrect, incorrect_override, not_attempted) x
3244: # (open_later), (open)
3245:
1.53 bowersj2 3246: if ($dateStatus == OPEN_LATER) {
3247: return OPEN_LATER;
1.51 bowersj2 3248: }
3249:
3250: # If it's WRONG...
1.53 bowersj2 3251: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 3252: # and there are TRIES LEFT:
1.79 bowersj2 3253: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 3254: return TRIES_LEFT;
1.51 bowersj2 3255: }
1.53 bowersj2 3256: return INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 3257: }
3258:
3259: # Otherwise, it's untried and open
1.53 bowersj2 3260: return OPEN;
1.51 bowersj2 3261: }
3262:
3263: =pod
3264:
3265: =head2 Resource/Nav Map Navigation
3266:
3267: =over 4
3268:
1.85 bowersj2 3269: =item * B<getNext>($alreadySeenHashRef): Retreive an array of the possible next resources after this one. Always returns an array, even in the one- or zero-element case. The "alreadySeenHashRef" is an optional parameter that can be passed in to the method. If $$alreadySeenHashRef{$res->id()} is true in that hash, getNext will not return it in the list. In other words, you can use it to suppress resources you've already seen in the getNext method directly.
3270:
3271: =item * B<getPrevious>($alreadySeenHashRef): Retreive an array of the possible previous resources from this one. Always returns an array, even in the one- or zero-element case. $alreadySeenHashRef is the same as in getNext.
1.51 bowersj2 3272:
3273: =cut
3274:
3275: sub getNext {
3276: my $self = shift;
3277: my $alreadySeenHash = shift;
3278: my @branches;
3279: my $to = $self->to();
1.85 bowersj2 3280: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 3281: my $choice = $self->{NAV_MAP}->getById($branch);
3282: my $next = $choice->goesto();
3283: $next = $self->{NAV_MAP}->getById($next);
3284:
1.61 bowersj2 3285: # Don't remember it if we've already seen it or if
1.66 bowersj2 3286: # the student doesn't have browse priviledges
3287: my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
1.51 bowersj2 3288: if (!defined($alreadySeenHash) ||
1.61 bowersj2 3289: !defined($alreadySeenHash->{$next->{ID}}) ||
1.66 bowersj2 3290: ($browsePriv ne '2' && $browsePriv ne 'F')) {
1.51 bowersj2 3291: push @branches, $next;
3292: }
1.85 bowersj2 3293: }
3294: return \@branches;
3295: }
3296:
3297: sub getPrevious {
3298: my $self = shift;
1.87 www 3299: my $alreadySeenHash = shift;
1.85 bowersj2 3300: my @branches;
3301: my $from = $self->from();
3302: foreach my $branch ( split /,/, $from) {
3303: my $choice = $self->{NAV_MAP}->getById($branch);
3304: my $prev = $choice->comesfrom();
3305: $prev = $self->{NAV_MAP}->getById($prev);
3306:
3307: # Skip it if we've already seen it or the user doesn't have
3308: # browse privs
3309: my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
3310: if (!defined($alreadySeenHash) ||
1.87 www 3311: !defined($alreadySeenHash->{$prev->{ID}}) ||
1.85 bowersj2 3312: ($browsePriv ne '2' && $browsePriv ne 'F')) {
1.87 www 3313: push @branches, $prev;
1.85 bowersj2 3314: }
1.51 bowersj2 3315: }
3316: return \@branches;
3317: }
3318:
3319: =pod
1.2 www 3320:
1.51 bowersj2 3321: =back
1.2 www 3322:
1.51 bowersj2 3323: =cut
1.2 www 3324:
1.51 bowersj2 3325: 1;
1.2 www 3326:
1.51 bowersj2 3327: __END__
1.2 www 3328:
3329:
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