1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.61 2003/10/22 16:10:56 www Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # (Server for RAT Maps
29: #
30: # (Edit Handler for RAT Maps
31: # (TeX Content Handler
32: #
33: # YEAR=2000
34: # 05/29/00,05/30 Gerd Kortemeyer)
35: # 7/1 Gerd Kortemeyer)
36: # 7/1,7/3,7/4,7/7,7/8,7/10 Gerd Kortemeyer)
37: #
38: # 7/15,7/17,7/18,8/1,8/2,8/4,8/5,8/21,8/22,8/23,8/30,
39: # 9/2,9/4,9/29,9/30,10/2,10/11,10/30,10/31,
40: # 11/1,11/2,11/14,11/16,11/22,12/28,
41: # YEAR=2001
42: # 07/05/01,08/30,08/31 Gerd Kortemeyer
43: #
44: ###
45:
46: package Apache::lonuserstate;
47:
48: # ------------------------------------------------- modules used by this module
49: use strict;
50: use Apache::Constants qw(:common :http);
51: use Apache::File;
52: use HTML::TokeParser;
53: use Apache::lonnet();
54: use Apache::loncommon();
55: use GDBM_File;
56: use Apache::lonmsg;
57: use Safe;
58: use Safe::Hole;
59: use Opcode;
60:
61: # ---------------------------------------------------- Globals for this package
62:
63: my $pc; # Package counter
64: my %hash; # The big tied hash
65: my %parmhash;# The hash with the parameters
66: my @cond; # Array with all of the conditions
67: my $errtext; # variable with all errors
68: my $retfurl; # variable with the very first URL in the course
69: my %randompick; # randomly picked resources
70: my %randompickseed; # optional seed for randomly picking resources
71:
72: # ----------------------------------- Remove version from URL and store in hash
73:
74: sub versiontrack {
75: my $uri=shift;
76: if ($uri=~/\.(\d+)\.\w+$/) {
77: my $version=$1;
78: $uri=~s/\.\d+\.(\w+)$/\.$1/;
79: $hash{'version_'.$uri}=$version;
80: }
81: return $uri;
82: }
83:
84: # -------------------------------------------------------------- Put in version
85:
86: sub putinversion {
87: my $uri=shift;
88: if ($hash{'version_'.$uri}) {
89: my $version=$hash{'version_'.$uri};
90: $uri=~s/\.(\w+)$/\.$version\.$1/;
91: }
92: return $uri;
93: }
94:
95: # ----------------------------------------- Processing versions file for course
96:
97: sub processversionfile {
98: my %cenv=shift;
99: my %versions=&Apache::lonnet::dump('resourceversions',
100: $cenv{'domain'},
101: $cenv{'num'});
102: foreach (keys %versions) {
103: if ($_=~/^error\:/) { return; }
104: if ($versions{$_} eq 'current') {
105: delete $hash{'version_'.$_};
106: } else {
107: $hash{'version_'.$_}=$versions{$_};
108: }
109: }
110: }
111:
112: # --------------------------------------------------------- Loads map from disk
113:
114: sub loadmap {
115: my $uri=shift;
116: if ($hash{'map_pc_'.$uri}) { return OK; }
117:
118: $pc++;
119: my $lpc=$pc;
120: $hash{'map_pc_'.$uri}=$lpc;
121: $hash{'map_id_'.$lpc}=$uri;
122:
123: # Determine and check filename
124: my $fn=&Apache::lonnet::filelocation('',$uri);
125:
126: my $ispage=($fn=~/\.page$/);
127:
128: unless (($fn=~/\.sequence$/) ||
129: ($fn=~/\.page$/)) {
130: $errtext.="Invalid map: $fn\n";
131: return OK;
132: }
133:
134: my $instr=&Apache::lonnet::getfile($fn);
135:
136: unless ($instr eq -1) {
137:
138: # Successfully got file, parse it
139:
140: my $parser = HTML::TokeParser->new(\$instr);
141: my $token;
142:
143: my $linkpc=0;
144:
145: $fn=~/\.(\w+)$/;
146:
147: $hash{'map_type_'.$lpc}=$1;
148:
149: while ($token = $parser->get_token) {
150: if ($token->[0] eq 'S') {
151: if ($token->[1] eq 'resource') {
152: # -------------------------------------------------------------------- Resource
153:
154: my $rid=$lpc.'.'.$token->[2]->{'id'};
155:
156: $hash{'kind_'.$rid}='res';
157: $hash{'title_'.$rid}=$token->[2]->{'title'};
158: # Rip out the version and store it separately
159: my $turi=&versiontrack($token->[2]->{'src'});
160: # If there is an explicit version parameter, use that one
161: if ($token->[2]->{'version'}) {
162: $hash{'version_'.$turi}=$1;
163: }
164: &Apache::lonnet::do_cache(\%Apache::lonnet::titlecache,
165: &Apache::lonnet::symbclean(
166: &Apache::lonnet::declutter($uri).'___'.
167: $token->[2]->{'id'}.'___'.
168: &Apache::lonnet::declutter($turi)),
169: $token->[2]->{'title'});
170: unless ($ispage) {
171: $turi=~/\.(\w+)$/;
172: my $embstyle=&Apache::loncommon::fileembstyle($1);
173: if ($token->[2]->{'external'} eq 'true') { # external
174: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
175: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
176: if (($embstyle eq 'img') || ($embstyle eq 'emb')
177: || ($embstyle eq 'ssi')) {
178: $turi='/adm/wrapper'.$turi;
179: } elsif ($turi!~/\.(sequence|page)$/) {
180: $turi='/adm/coursedocs/showdoc'.$turi;
181: }
182: } else { # normal internal resource
183: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
184: $turi='/adm/wrapper'.$turi;
185: }
186: }
187: }
188:
189: if (defined($hash{'ids_'.$turi})) {
190: $hash{'ids_'.$turi}.=','.$rid;
191: } else {
192: $hash{'ids_'.$turi}=''.$rid;
193: }
194:
195: if
196: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
197: $turi.='?register=1';
198: }
199:
200: $hash{'src_'.$rid}=$turi;
201:
202: if ($token->[2]->{'external'} eq 'true') {
203: $hash{'ext_'.$rid}='true:';
204: } else {
205: $hash{'ext_'.$rid}='false:';
206: }
207: if ($token->[2]->{'type'}) {
208: $hash{'type_'.$rid}=$token->[2]->{'type'};
209: if ($token->[2]->{'type'} eq 'start') {
210: $hash{'map_start_'.$uri}="$rid";
211: }
212: if ($token->[2]->{'type'} eq 'finish') {
213: $hash{'map_finish_'.$uri}="$rid";
214: }
215: } else {
216: $hash{'type_'.$rid}='normal';
217: }
218:
219: if (($turi=~/\.sequence$/) ||
220: ($turi=~/\.page$/)) {
221: $hash{'is_map_'.$rid}=1;
222: &loadmap($turi);
223: }
224:
225: } elsif ($token->[1] eq 'condition') {
226: # ------------------------------------------------------------------- Condition
227:
228: my $rid=$lpc.'.'.$token->[2]->{'id'};
229:
230: $hash{'kind_'.$rid}='cond';
231: $cond[$#cond+1]=$token->[2]->{'value'};
232: $hash{'condid_'.$rid}=$#cond;
233: if ($token->[2]->{'type'}) {
234: $cond[$#cond].=':'.$token->[2]->{'type'};
235: } else {
236: $cond[$#cond].=':normal';
237: }
238:
239: } elsif ($token->[1] eq 'link') {
240: # ----------------------------------------------------------------------- Links
241:
242: $linkpc++;
243: my $linkid=$lpc.'.'.$linkpc;
244:
245: my $goesto=$lpc.'.'.$token->[2]->{'to'};
246: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
247: my $undercond=0;
248:
249: if ($token->[2]->{'condition'}) {
250: $undercond=$lpc.'.'.$token->[2]->{'condition'};
251: }
252:
253: $hash{'goesto_'.$linkid}=$goesto;
254: $hash{'comesfrom_'.$linkid}=$comesfrom;
255: $hash{'undercond_'.$linkid}=$undercond;
256:
257: if (defined($hash{'to_'.$comesfrom})) {
258: $hash{'to_'.$comesfrom}.=','.$linkid;
259: } else {
260: $hash{'to_'.$comesfrom}=''.$linkid;
261: }
262: if (defined($hash{'from_'.$goesto})) {
263: $hash{'from_'.$goesto}.=','.$linkid;
264: } else {
265: $hash{'from_'.$goesto}=''.$linkid;
266: }
267: } elsif ($token->[1] eq 'param') {
268: # ------------------------------------------------------------------- Parameter
269:
270: my $referid=$lpc.'.'.$token->[2]->{'to'};
271: my $part=$token->[2]->{'part'};
272: unless ($part) { $part=0; }
273: my $newparam=
274: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
275: &Apache::lonnet::escape($part.'.'.
276: $token->[2]->{'name'}).'='.
277: &Apache::lonnet::escape($token->[2]->{'value'});
278: if (defined($hash{'param_'.$referid})) {
279: $hash{'param_'.$referid}.='&'.$newparam;
280: } else {
281: $hash{'param_'.$referid}=''.$newparam;
282: }
283: if ($token->[2]->{'name'} eq 'parameter_mapalias') {
284: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
285: }
286: if ($token->[2]->{'name'} eq 'parameter_randompick') {
287: $randompick{$referid}=$token->[2]->{'value'};
288: }
289: if ($token->[2]->{'name'} eq 'parameter_randompickseed') {
290: $randompick{$referid}=$token->[2]->{'value'};
291: }
292: }
293:
294: }
295: }
296:
297: } else {
298: $errtext.='Map not loaded: The file does not exist. ';
299: }
300: }
301:
302: # --------------------------------------------------------- Simplify expression
303:
304: sub simplify {
305: my $expression=shift;
306: # (8)=8
307: $expression=~s/\((\d+)\)/$1/g;
308: # 8&8=8
309: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
310: # 8|8=8
311: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
312: # (5&3)&4=5&3&4
313: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
314: # (((5&3)|(4&6)))=((5&3)|(4&6))
315: $expression=~
316: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
317: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
318: $expression=~
319: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
320: return $expression;
321: }
322:
323: # -------------------------------------------------------- Build condition hash
324:
325: sub traceroute {
326: my ($sofar,$rid,$beenhere)=@_;
327: $sofar=simplify($sofar);
328: unless ($beenhere=~/\&$rid\&/) {
329: $beenhere.=$rid.'&';
330: if (($retfurl eq '') && ($hash{'src_'.$rid})
331: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
332: my ($mapid,$resid)=split(/\./,$rid);
333: $retfurl=$hash{'src_'.$rid}.
334: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
335: &Apache::lonnet::symbclean(
336: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
337: '___'.$resid.'___'.
338: &Apache::lonnet::declutter($hash{'src_'.$rid}));
339: }
340: if (defined($hash{'conditions_'.$rid})) {
341: $hash{'conditions_'.$rid}=simplify(
342: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
343: } else {
344: $hash{'conditions_'.$rid}=$sofar;
345: }
346: if (defined($hash{'is_map_'.$rid})) {
347: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
348: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
349: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
350: $sofar=
351: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
352: }
353: }
354: }
355: if (defined($hash{'to_'.$rid})) {
356: foreach (split(/\,/,$hash{'to_'.$rid})) {
357: my $further=$sofar;
358: if ($hash{'undercond_'.$_}) {
359: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
360: $further=simplify('('.$further.')&('.
361: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
362: } else {
363: $errtext.='Undefined condition ID: '
364: .$hash{'undercond_'.$_}.'. ';
365: }
366: }
367: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
368: }
369: }
370: }
371: }
372:
373: # ------------------------------ Cascading conditions, quick access, parameters
374:
375: sub accinit {
376: my ($uri,$short,$fn)=@_;
377: my %acchash=();
378: my %captured=();
379: my $condcounter=0;
380: $acchash{'acc.cond.'.$short.'.0'}=0;
381: foreach (keys %hash) {
382: if ($_=~/^conditions/) {
383: my $expr=$hash{$_};
384: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
385: my $sub=$_;
386: my $orig=$_;
387: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
388: my $factor=$1;
389: $sub=~s/$factor//g;
390: $sub=~s/^\(/\($factor\(/;
391: $sub.=')';
392: $sub=simplify($sub);
393: $orig=~s/(\W)/\\$1/g;
394: $expr=~s/$orig/$sub/;
395: }
396: $hash{$_}=$expr;
397: unless (defined($captured{$expr})) {
398: $condcounter++;
399: $captured{$expr}=$condcounter;
400: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
401: }
402: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
403: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
404: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
405: foreach (split(/\&/,$hash{$_})) {
406: my ($typename,$value)=split(/\=/,$_);
407: my ($type,$name)=split(/\:/,$typename);
408: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
409: &Apache::lonnet::unescape($value);
410: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
411: &Apache::lonnet::unescape($type);
412: }
413: }
414: }
415: foreach (keys %hash) {
416: if ($_=~/^ids/) {
417: foreach (split(/\,/,$hash{$_})) {
418: my $resid=$_;
419: my $uri=$hash{'src_'.$resid};
420: $uri=~s/^\/adm\/wrapper//;
421: $uri=&Apache::lonnet::declutter($uri);
422: my @uriparts=split(/\//,$uri);
423: my $urifile=$uriparts[$#uriparts];
424: $#uriparts--;
425: my $uripath=join('/',@uriparts);
426: if ($uripath) {
427: my $uricond='0';
428: if (defined($hash{'conditions_'.$resid})) {
429: $uricond=$captured{$hash{'conditions_'.$resid}};
430: }
431: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
432: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
433: /(\&\Q$urifile\E\:[^\&]*)/) {
434: my $replace=$1;
435: my $regexp=$replace;
436: $regexp=~s/\|/\\\|/g;
437: $acchash{'acc.res.'.$short.'.'.$uripath}
438: =~s/$regexp/$replace\|$uricond/;
439: } else {
440: $acchash{'acc.res.'.$short.'.'.$uripath}.=
441: $urifile.':'.$uricond.'&';
442: }
443: } else {
444: $acchash{'acc.res.'.$short.'.'.$uripath}=
445: '&'.$urifile.':'.$uricond.'&';
446: }
447: }
448: }
449: }
450: }
451: $acchash{'acc.res.'.$short.'.'}='&:0&';
452: my $courseuri=$uri;
453: $courseuri=~s/^\/res\///;
454: &Apache::lonnet::delenv('(acc\.|httpref\.)');
455: &Apache::lonnet::appenv(%acchash,
456: "request.course.id" => $short,
457: "request.course.fn" => $fn,
458: "request.course.uri" => $courseuri);
459: }
460:
461: # ------------------------------------- Selectively delete from randompick maps
462:
463: sub pickrandom {
464: my $randomoutentry='';
465: foreach my $rid (keys %randompick) {
466: my $rndpick=$randompick{$rid};
467: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
468: # ------------------------------------------- put existing resources into array
469: my @currentrids=();
470: foreach (sort(keys(%hash))) {
471: if ($_=~/^src_($mpc\.\d+)/) {
472: if ($hash{'src_'.$1}) { push @currentrids, $1; }
473: }
474: }
475: # rids are number.number and we want to numercially sort on
476: # the second number
477: @currentrids=sort {
478: my (undef,$aid)=split(/\./,$a);
479: my (undef,$bid)=split(/\./,$b);
480: $aid <=> $bid;
481: } @currentrids;
482: next if ($#currentrids<$rndpick);
483: # -------------------------------- randomly eliminate the ones that should stay
484: my (undef,$id)=split(/\./,$rid);
485: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
486: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
487: &Apache::lonnet::setup_random_from_rndseed($rndseed);
488: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
489: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
490: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
491: # -------------------------------------------------------- delete the leftovers
492: for (my $k=0; $k<=$#currentrids; $k++) {
493: if ($currentrids[$k]) {
494: $hash{'randomout_'.$currentrids[$k]}=1;
495: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
496: $randomoutentry.='&'.
497: &Apache::lonnet::symbclean(
498: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
499: '___'.$resid.'___'.
500: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
501: ).'&';
502: }
503: }
504: }
505: if ($randomoutentry) {
506: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
507: }
508: }
509:
510: # ---------------------------------------------------- Read map and all submaps
511:
512: sub readmap {
513: my $short=shift;
514: $short=~s/^\///;
515: my %cenv=&Apache::lonnet::coursedescription($short);
516: my $fn=$cenv{'fn'};
517: my $uri;
518: $short=~s/\//\_/g;
519: unless ($uri=$cenv{'url'}) {
520: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
521: "Could not load course $short.</font>");
522: return 'No course data available.';
523: }
524: @cond=('true:normal');
525: unlink($fn.'.db');
526: unlink($fn.'_symb.db');
527: unlink($fn.'.state');
528: unlink($fn.'parms.db');
529: undef %randompick;
530: $retfurl='';
531: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
532: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
533: %hash=();
534: %parmhash=();
535: $errtext='';
536: $pc=0;
537: my $furi=&Apache::lonnet::clutter($uri);
538: $hash{'src_0.0'}=&versiontrack($furi);
539: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
540: $hash{'ids_'.$furi}='0.0';
541: $hash{'is_map_0.0'}=1;
542: loadmap($uri);
543: if (defined($hash{'map_start_'.$uri})) {
544: &traceroute('0',$hash{'map_start_'.$uri},'&');
545: &accinit($uri,$short,$fn);
546: &pickrandom();
547: }
548: # ------------------------------------------------------------ Version tracking
549: &processversionfile(%cenv);
550: foreach (keys %hash) {
551: if ($_=~/^src\_/) {
552: $hash{$_}=&putinversion($hash{$_});
553: }
554: }
555: unless ((untie(%hash)) && (untie(%parmhash))) {
556: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
557: "Could not untie coursemap $fn for $uri.</font>");
558: }
559: {
560: my $cfh;
561: if ($cfh=Apache::File->new(">$fn.state")) {
562: print $cfh join("\n",@cond);
563: } else {
564: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
565: "Could not write statemap $fn for $uri.</font>");
566: }
567: }
568: } else {
569: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
570: "Could not tie coursemap $fn for $uri.</font>");
571: }
572: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
573: # ------------------------------------------------- Check for critical messages
574:
575: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
576: $ENV{'user.name'});
577: if ($what[0]) {
578: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
579: $retfurl='/adm/email?critical=display';
580: }
581: }
582: return ($retfurl,$errtext);
583: }
584:
585: # ------------------------------------------------------- Evaluate state string
586:
587: sub evalstate {
588:
589: my $fn=$ENV{'request.course.fn'}.'.state';
590: my $state='2';
591: if (-e $fn) {
592: my @conditions=();
593: {
594: my $fh=Apache::File->new($fn);
595: @conditions=<$fh>;
596: }
597: my $safeeval = new Safe;
598: my $safehole = new Safe::Hole;
599: $safeeval->permit("entereval");
600: $safeeval->permit(":base_math");
601: $safeeval->deny(":base_io");
602: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
603: foreach (@conditions) {
604: my $line=$_;
605: chomp($line);
606: my ($condition,$weight)=split(/\:/,$_);
607: if ($safeeval->reval($condition)) {
608: if ($weight eq 'force') {
609: $state.='3';
610: } else {
611: $state.='2';
612: }
613: } else {
614: if ($weight eq 'stop') {
615: $state.='0';
616: } else {
617: $state.='1';
618: }
619: }
620: }
621: }
622: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
623: return $state;
624: }
625:
626: 1;
627: __END__
628:
629: =head1 NAME
630:
631: Apache::lonuserstate - Construct and maintain state and binary representation
632: of course for user
633:
634: =head1 SYNOPSIS
635:
636: Invoked by lonroles.pm.
637:
638: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
639:
640: =head1 INTRODUCTION
641:
642: This module constructs and maintains state and binary representation
643: of course for user.
644:
645: This is part of the LearningOnline Network with CAPA project
646: described at http://www.lon-capa.org.
647:
648: =head1 HANDLER SUBROUTINE
649:
650: There is no handler subroutine.
651:
652: =head1 OTHER SUBROUTINES
653:
654: =over 4
655:
656: =item *
657:
658: loadmap() : Loads map from disk
659:
660: =item *
661:
662: simplify() : Simplify expression
663:
664: =item *
665:
666: traceroute() : Build condition hash
667:
668: =item *
669:
670: accinit() : Cascading conditions, quick access, parameters
671:
672: =item *
673:
674: readmap() : Read map and all submaps
675:
676: =item *
677:
678: evalstate() : Evaluate state string
679:
680: =back
681:
682: =cut
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonuserstate.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / rat