1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.69 2003/12/15 15:26:26 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: ###
29:
30: package Apache::lonuserstate;
31:
32: # ------------------------------------------------- modules used by this module
33: use strict;
34: use Apache::Constants qw(:common :http);
35: use Apache::File;
36: use HTML::TokeParser;
37: use Apache::lonnet();
38: use Apache::loncommon();
39: use GDBM_File;
40: use Apache::lonmsg;
41: use Safe;
42: use Safe::Hole;
43: use Opcode;
44:
45: # ---------------------------------------------------- Globals for this package
46:
47: my $pc; # Package counter
48: my %hash; # The big tied hash
49: my %parmhash;# The hash with the parameters
50: my @cond; # Array with all of the conditions
51: my $errtext; # variable with all errors
52: my $retfurl; # variable with the very first URL in the course
53: my %randompick; # randomly picked resources
54: my %randompickseed; # optional seed for randomly picking resources
55:
56: # ----------------------------------- Remove version from URL and store in hash
57:
58: sub versiontrack {
59: my $uri=shift;
60: if ($uri=~/\.(\d+)\.\w+$/) {
61: my $version=$1;
62: $uri=~s/\.\d+\.(\w+)$/\.$1/;
63: unless ($hash{'version_'.$uri}) {
64: $hash{'version_'.$uri}=$version;
65: }
66: }
67: return $uri;
68: }
69:
70: # -------------------------------------------------------------- Put in version
71:
72: sub putinversion {
73: my $uri=shift;
74: if ($hash{'version_'.$uri}) {
75: my $version=$hash{'version_'.$uri};
76: if ($version eq 'mostrecent') { return $uri; }
77: if ($version eq &Apache::lonnet::getversion(
78: &Apache::lonnet::filelocation('',$uri)))
79: { return $uri; }
80: $uri=~s/\.(\w+)$/\.$version\.$1/;
81: }
82: return $uri;
83: }
84:
85: # ----------------------------------------- Processing versions file for course
86:
87: sub processversionfile {
88: my %cenv=@_;
89: my %versions=&Apache::lonnet::dump('resourceversions',
90: $cenv{'domain'},
91: $cenv{'num'});
92: foreach (keys %versions) {
93: if ($_=~/^error\:/) { return; }
94: $hash{'version_'.$_}=$versions{$_};
95: }
96: }
97:
98: # --------------------------------------------------------- Loads map from disk
99:
100: sub loadmap {
101: my $uri=shift;
102: if ($hash{'map_pc_'.$uri}) { return OK; }
103:
104: $pc++;
105: my $lpc=$pc;
106: $hash{'map_pc_'.$uri}=$lpc;
107: $hash{'map_id_'.$lpc}=$uri;
108:
109: # Determine and check filename
110: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
111:
112: my $ispage=($fn=~/\.page$/);
113:
114: unless (($fn=~/\.sequence$/) ||
115: ($fn=~/\.page$/)) {
116: $errtext.="Invalid map: $fn\n";
117: return OK;
118: }
119:
120: my $instr=&Apache::lonnet::getfile($fn);
121:
122: unless ($instr eq -1) {
123:
124: # Successfully got file, parse it
125:
126: my $parser = HTML::TokeParser->new(\$instr);
127: my $token;
128:
129: my $linkpc=0;
130:
131: $fn=~/\.(\w+)$/;
132:
133: $hash{'map_type_'.$lpc}=$1;
134:
135: while ($token = $parser->get_token) {
136: if ($token->[0] eq 'S') {
137: if ($token->[1] eq 'resource') {
138: # -------------------------------------------------------------------- Resource
139:
140: my $rid=$lpc.'.'.$token->[2]->{'id'};
141:
142: $hash{'kind_'.$rid}='res';
143: $hash{'title_'.$rid}=$token->[2]->{'title'};
144: my $turi=&versiontrack($token->[2]->{'src'});
145: if ($token->[2]->{'version'}) {
146: unless ($hash{'version_'.$turi}) {
147: $hash{'version_'.$turi}=$1;
148: }
149: }
150: &Apache::lonnet::do_cache(\%Apache::lonnet::titlecache,
151: &Apache::lonnet::encode_symb($uri,$token->[2]->{'id'},
152: $turi),
153: $token->[2]->{'title'},'title');
154: unless ($ispage) {
155: $turi=~/\.(\w+)$/;
156: my $embstyle=&Apache::loncommon::fileembstyle($1);
157: if ($token->[2]->{'external'} eq 'true') { # external
158: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
159: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
160: if (($embstyle eq 'img') || ($embstyle eq 'emb')
161: || ($embstyle eq 'ssi')) {
162: $turi='/adm/wrapper'.$turi;
163: } elsif ($turi!~/\.(sequence|page)$/) {
164: $turi='/adm/coursedocs/showdoc'.$turi;
165: }
166: } elsif ($turi) { # normal non-empty internal resource
167: my $mapdir=$uri;
168: $mapdir=~s/[^\/]+$//;
169: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
170: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
171: $turi='/adm/wrapper'.$turi;
172: }
173: }
174: }
175:
176: if (defined($hash{'ids_'.$turi})) {
177: $hash{'ids_'.$turi}.=','.$rid;
178: } else {
179: $hash{'ids_'.$turi}=''.$rid;
180: }
181:
182: if
183: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
184: $turi.='?register=1';
185: }
186:
187: $hash{'src_'.$rid}=$turi;
188:
189: if ($token->[2]->{'external'} eq 'true') {
190: $hash{'ext_'.$rid}='true:';
191: } else {
192: $hash{'ext_'.$rid}='false:';
193: }
194: if ($token->[2]->{'type'}) {
195: $hash{'type_'.$rid}=$token->[2]->{'type'};
196: if ($token->[2]->{'type'} eq 'start') {
197: $hash{'map_start_'.$uri}="$rid";
198: }
199: if ($token->[2]->{'type'} eq 'finish') {
200: $hash{'map_finish_'.$uri}="$rid";
201: }
202: } else {
203: $hash{'type_'.$rid}='normal';
204: }
205:
206: if (($turi=~/\.sequence$/) ||
207: ($turi=~/\.page$/)) {
208: $hash{'is_map_'.$rid}=1;
209: &loadmap($turi);
210: }
211:
212: } elsif ($token->[1] eq 'condition') {
213: # ------------------------------------------------------------------- Condition
214:
215: my $rid=$lpc.'.'.$token->[2]->{'id'};
216:
217: $hash{'kind_'.$rid}='cond';
218: $cond[$#cond+1]=$token->[2]->{'value'};
219: $hash{'condid_'.$rid}=$#cond;
220: if ($token->[2]->{'type'}) {
221: $cond[$#cond].=':'.$token->[2]->{'type'};
222: } else {
223: $cond[$#cond].=':normal';
224: }
225:
226: } elsif ($token->[1] eq 'link') {
227: # ----------------------------------------------------------------------- Links
228:
229: $linkpc++;
230: my $linkid=$lpc.'.'.$linkpc;
231:
232: my $goesto=$lpc.'.'.$token->[2]->{'to'};
233: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
234: my $undercond=0;
235:
236: if ($token->[2]->{'condition'}) {
237: $undercond=$lpc.'.'.$token->[2]->{'condition'};
238: }
239:
240: $hash{'goesto_'.$linkid}=$goesto;
241: $hash{'comesfrom_'.$linkid}=$comesfrom;
242: $hash{'undercond_'.$linkid}=$undercond;
243:
244: if (defined($hash{'to_'.$comesfrom})) {
245: $hash{'to_'.$comesfrom}.=','.$linkid;
246: } else {
247: $hash{'to_'.$comesfrom}=''.$linkid;
248: }
249: if (defined($hash{'from_'.$goesto})) {
250: $hash{'from_'.$goesto}.=','.$linkid;
251: } else {
252: $hash{'from_'.$goesto}=''.$linkid;
253: }
254: } elsif ($token->[1] eq 'param') {
255: # ------------------------------------------------------------------- Parameter
256:
257: my $referid=$lpc.'.'.$token->[2]->{'to'};
258: my $name=$token->[2]->{'name'};
259: my $part;
260: if ($name=~/^parameter_(.*)_/) {
261: $part=$1;
262: } else {
263: $part=0;
264: }
265: $name=~s/^.*_([^_]*)$/$1/;
266: my $newparam=
267: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
268: &Apache::lonnet::escape($part.'.'.$name).'='.
269: &Apache::lonnet::escape($token->[2]->{'value'});
270: if (defined($hash{'param_'.$referid})) {
271: $hash{'param_'.$referid}.='&'.$newparam;
272: } else {
273: $hash{'param_'.$referid}=''.$newparam;
274: }
275: if ($token->[2]->{'name'} eq 'parameter_mapalias') {
276: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
277: }
278: if ($token->[2]->{'name'} eq 'parameter_randompick') {
279: $randompick{$referid}=$token->[2]->{'value'};
280: }
281: if ($token->[2]->{'name'} eq 'parameter_randompickseed') {
282: $randompick{$referid}=$token->[2]->{'value'};
283: }
284: }
285:
286: }
287: }
288:
289: } else {
290: $errtext.='Map not loaded: The file does not exist. ';
291: }
292: }
293:
294: # --------------------------------------------------------- Simplify expression
295:
296: sub simplify {
297: my $expression=shift;
298: # (8)=8
299: $expression=~s/\((\d+)\)/$1/g;
300: # 8&8=8
301: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
302: # 8|8=8
303: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
304: # (5&3)&4=5&3&4
305: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
306: # (((5&3)|(4&6)))=((5&3)|(4&6))
307: $expression=~
308: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
309: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
310: $expression=~
311: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
312: return $expression;
313: }
314:
315: # -------------------------------------------------------- Build condition hash
316:
317: sub traceroute {
318: my ($sofar,$rid,$beenhere)=@_;
319: $sofar=simplify($sofar);
320: unless ($beenhere=~/\&$rid\&/) {
321: $beenhere.=$rid.'&';
322: if (($retfurl eq '') && ($hash{'src_'.$rid})
323: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
324: my ($mapid,$resid)=split(/\./,$rid);
325: $retfurl=$hash{'src_'.$rid}.
326: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
327: &Apache::lonnet::symbclean(
328: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
329: '___'.$resid.'___'.
330: &Apache::lonnet::declutter($hash{'src_'.$rid}));
331: }
332: if (defined($hash{'conditions_'.$rid})) {
333: $hash{'conditions_'.$rid}=simplify(
334: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
335: } else {
336: $hash{'conditions_'.$rid}=$sofar;
337: }
338: if (defined($hash{'is_map_'.$rid})) {
339: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
340: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
341: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
342: $sofar=
343: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
344: }
345: }
346: }
347: if (defined($hash{'to_'.$rid})) {
348: foreach (split(/\,/,$hash{'to_'.$rid})) {
349: my $further=$sofar;
350: if ($hash{'undercond_'.$_}) {
351: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
352: $further=simplify('('.$further.')&('.
353: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
354: } else {
355: $errtext.='Undefined condition ID: '
356: .$hash{'undercond_'.$_}.'. ';
357: }
358: }
359: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
360: }
361: }
362: }
363: }
364:
365: # ------------------------------ Cascading conditions, quick access, parameters
366:
367: sub accinit {
368: my ($uri,$short,$fn)=@_;
369: my %acchash=();
370: my %captured=();
371: my $condcounter=0;
372: $acchash{'acc.cond.'.$short.'.0'}=0;
373: foreach (keys %hash) {
374: if ($_=~/^conditions/) {
375: my $expr=$hash{$_};
376: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
377: my $sub=$_;
378: my $orig=$_;
379: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
380: my $factor=$1;
381: $sub=~s/$factor//g;
382: $sub=~s/^\(/\($factor\(/;
383: $sub.=')';
384: $sub=simplify($sub);
385: $orig=~s/(\W)/\\$1/g;
386: $expr=~s/$orig/$sub/;
387: }
388: $hash{$_}=$expr;
389: unless (defined($captured{$expr})) {
390: $condcounter++;
391: $captured{$expr}=$condcounter;
392: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
393: }
394: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
395: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
396: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
397: foreach (split(/\&/,$hash{$_})) {
398: my ($typename,$value)=split(/\=/,$_);
399: my ($type,$name)=split(/\:/,$typename);
400: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
401: &Apache::lonnet::unescape($value);
402: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
403: &Apache::lonnet::unescape($type);
404: }
405: }
406: }
407: foreach (keys %hash) {
408: if ($_=~/^ids/) {
409: foreach (split(/\,/,$hash{$_})) {
410: my $resid=$_;
411: my $uri=$hash{'src_'.$resid};
412: $uri=~s/^\/adm\/wrapper//;
413: $uri=&Apache::lonnet::declutter($uri);
414: my @uriparts=split(/\//,$uri);
415: my $urifile=$uriparts[$#uriparts];
416: $#uriparts--;
417: my $uripath=join('/',@uriparts);
418: if ($uripath) {
419: my $uricond='0';
420: if (defined($hash{'conditions_'.$resid})) {
421: $uricond=$captured{$hash{'conditions_'.$resid}};
422: }
423: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
424: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
425: /(\&\Q$urifile\E\:[^\&]*)/) {
426: my $replace=$1;
427: my $regexp=$replace;
428: $regexp=~s/\|/\\\|/g;
429: $acchash{'acc.res.'.$short.'.'.$uripath}
430: =~s/$regexp/$replace\|$uricond/;
431: } else {
432: $acchash{'acc.res.'.$short.'.'.$uripath}.=
433: $urifile.':'.$uricond.'&';
434: }
435: } else {
436: $acchash{'acc.res.'.$short.'.'.$uripath}=
437: '&'.$urifile.':'.$uricond.'&';
438: }
439: }
440: }
441: }
442: }
443: $acchash{'acc.res.'.$short.'.'}='&:0&';
444: my $courseuri=$uri;
445: $courseuri=~s/^\/res\///;
446: &Apache::lonnet::delenv('(acc\.|httpref\.)');
447: &Apache::lonnet::appenv(%acchash,
448: "request.course.id" => $short,
449: "request.course.fn" => $fn,
450: "request.course.uri" => $courseuri);
451: }
452:
453: # ------------------------------------- Selectively delete from randompick maps
454:
455: sub pickrandom {
456: my $randomoutentry='';
457: foreach my $rid (keys %randompick) {
458: my $rndpick=$randompick{$rid};
459: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
460: # ------------------------------------------- put existing resources into array
461: my @currentrids=();
462: foreach (sort(keys(%hash))) {
463: if ($_=~/^src_($mpc\.\d+)/) {
464: if ($hash{'src_'.$1}) { push @currentrids, $1; }
465: }
466: }
467: # rids are number.number and we want to numercially sort on
468: # the second number
469: @currentrids=sort {
470: my (undef,$aid)=split(/\./,$a);
471: my (undef,$bid)=split(/\./,$b);
472: $aid <=> $bid;
473: } @currentrids;
474: next if ($#currentrids<$rndpick);
475: # -------------------------------- randomly eliminate the ones that should stay
476: my (undef,$id)=split(/\./,$rid);
477: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
478: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
479: &Apache::lonnet::setup_random_from_rndseed($rndseed);
480: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
481: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
482: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
483: # -------------------------------------------------------- delete the leftovers
484: for (my $k=0; $k<=$#currentrids; $k++) {
485: if ($currentrids[$k]) {
486: $hash{'randomout_'.$currentrids[$k]}=1;
487: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
488: $randomoutentry.='&'.
489: &Apache::lonnet::symbclean(
490: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
491: '___'.$resid.'___'.
492: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
493: ).'&';
494: }
495: }
496: }
497: if ($randomoutentry) {
498: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
499: }
500: }
501:
502: # ---------------------------------------------------- Read map and all submaps
503:
504: sub readmap {
505: my $short=shift;
506: $short=~s/^\///;
507: my %cenv=&Apache::lonnet::coursedescription($short);
508: my $fn=$cenv{'fn'};
509: my $uri;
510: $short=~s/\//\_/g;
511: unless ($uri=$cenv{'url'}) {
512: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
513: "Could not load course $short.</font>");
514: return 'No course data available.';
515: }
516: @cond=('true:normal');
517: unlink($fn.'.db');
518: unlink($fn.'_symb.db');
519: unlink($fn.'.state');
520: unlink($fn.'parms.db');
521: undef %randompick;
522: $retfurl='';
523: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
524: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
525: %hash=();
526: %parmhash=();
527: $errtext='';
528: $pc=0;
529: &processversionfile(%cenv);
530: my $furi=&Apache::lonnet::clutter($uri);
531: $hash{'src_0.0'}=&versiontrack($furi);
532: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
533: $hash{'ids_'.$furi}='0.0';
534: $hash{'is_map_0.0'}=1;
535: loadmap($uri);
536: if (defined($hash{'map_start_'.$uri})) {
537: &traceroute('0',$hash{'map_start_'.$uri},'&');
538: &accinit($uri,$short,$fn);
539: &pickrandom();
540: }
541: # ------------------------------------------------------- Put versions into src
542: foreach (keys %hash) {
543: if ($_=~/^src\_/) {
544: $hash{$_}=&putinversion($hash{$_});
545: }
546: }
547: unless ((untie(%hash)) && (untie(%parmhash))) {
548: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
549: "Could not untie coursemap $fn for $uri.</font>");
550: }
551: {
552: my $cfh;
553: if ($cfh=Apache::File->new(">$fn.state")) {
554: print $cfh join("\n",@cond);
555: } else {
556: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
557: "Could not write statemap $fn for $uri.</font>");
558: }
559: }
560: } else {
561: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
562: "Could not tie coursemap $fn for $uri.</font>");
563: }
564: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
565: # ------------------------------------------------- Check for critical messages
566:
567: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
568: $ENV{'user.name'});
569: if ($what[0]) {
570: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
571: $retfurl='/adm/email?critical=display';
572: }
573: }
574: return ($retfurl,$errtext);
575: }
576:
577: # ------------------------------------------------------- Evaluate state string
578:
579: sub evalstate {
580:
581: my $fn=$ENV{'request.course.fn'}.'.state';
582: my $state='2';
583: if (-e $fn) {
584: my @conditions=();
585: {
586: my $fh=Apache::File->new($fn);
587: @conditions=<$fh>;
588: }
589: my $safeeval = new Safe;
590: my $safehole = new Safe::Hole;
591: $safeeval->permit("entereval");
592: $safeeval->permit(":base_math");
593: $safeeval->deny(":base_io");
594: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
595: foreach (@conditions) {
596: my $line=$_;
597: chomp($line);
598: my ($condition,$weight)=split(/\:/,$_);
599: if ($safeeval->reval($condition)) {
600: if ($weight eq 'force') {
601: $state.='3';
602: } else {
603: $state.='2';
604: }
605: } else {
606: if ($weight eq 'stop') {
607: $state.='0';
608: } else {
609: $state.='1';
610: }
611: }
612: }
613: }
614: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
615: return $state;
616: }
617:
618: 1;
619: __END__
620:
621: =head1 NAME
622:
623: Apache::lonuserstate - Construct and maintain state and binary representation
624: of course for user
625:
626: =head1 SYNOPSIS
627:
628: Invoked by lonroles.pm.
629:
630: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
631:
632: =head1 INTRODUCTION
633:
634: This module constructs and maintains state and binary representation
635: of course for user.
636:
637: This is part of the LearningOnline Network with CAPA project
638: described at http://www.lon-capa.org.
639:
640: =head1 HANDLER SUBROUTINE
641:
642: There is no handler subroutine.
643:
644: =head1 OTHER SUBROUTINES
645:
646: =over 4
647:
648: =item *
649:
650: loadmap() : Loads map from disk
651:
652: =item *
653:
654: simplify() : Simplify expression
655:
656: =item *
657:
658: traceroute() : Build condition hash
659:
660: =item *
661:
662: accinit() : Cascading conditions, quick access, parameters
663:
664: =item *
665:
666: readmap() : Read map and all submaps
667:
668: =item *
669:
670: evalstate() : Evaluate state string
671:
672: =back
673:
674: =cut
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