1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.67 2003/11/01 16:42:13 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: } else { # normal internal resource
167: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
168: $turi='/adm/wrapper'.$turi;
169: }
170: }
171: }
172:
173: if (defined($hash{'ids_'.$turi})) {
174: $hash{'ids_'.$turi}.=','.$rid;
175: } else {
176: $hash{'ids_'.$turi}=''.$rid;
177: }
178:
179: if
180: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
181: $turi.='?register=1';
182: }
183:
184: $hash{'src_'.$rid}=$turi;
185:
186: if ($token->[2]->{'external'} eq 'true') {
187: $hash{'ext_'.$rid}='true:';
188: } else {
189: $hash{'ext_'.$rid}='false:';
190: }
191: if ($token->[2]->{'type'}) {
192: $hash{'type_'.$rid}=$token->[2]->{'type'};
193: if ($token->[2]->{'type'} eq 'start') {
194: $hash{'map_start_'.$uri}="$rid";
195: }
196: if ($token->[2]->{'type'} eq 'finish') {
197: $hash{'map_finish_'.$uri}="$rid";
198: }
199: } else {
200: $hash{'type_'.$rid}='normal';
201: }
202:
203: if (($turi=~/\.sequence$/) ||
204: ($turi=~/\.page$/)) {
205: $hash{'is_map_'.$rid}=1;
206: &loadmap($turi);
207: }
208:
209: } elsif ($token->[1] eq 'condition') {
210: # ------------------------------------------------------------------- Condition
211:
212: my $rid=$lpc.'.'.$token->[2]->{'id'};
213:
214: $hash{'kind_'.$rid}='cond';
215: $cond[$#cond+1]=$token->[2]->{'value'};
216: $hash{'condid_'.$rid}=$#cond;
217: if ($token->[2]->{'type'}) {
218: $cond[$#cond].=':'.$token->[2]->{'type'};
219: } else {
220: $cond[$#cond].=':normal';
221: }
222:
223: } elsif ($token->[1] eq 'link') {
224: # ----------------------------------------------------------------------- Links
225:
226: $linkpc++;
227: my $linkid=$lpc.'.'.$linkpc;
228:
229: my $goesto=$lpc.'.'.$token->[2]->{'to'};
230: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
231: my $undercond=0;
232:
233: if ($token->[2]->{'condition'}) {
234: $undercond=$lpc.'.'.$token->[2]->{'condition'};
235: }
236:
237: $hash{'goesto_'.$linkid}=$goesto;
238: $hash{'comesfrom_'.$linkid}=$comesfrom;
239: $hash{'undercond_'.$linkid}=$undercond;
240:
241: if (defined($hash{'to_'.$comesfrom})) {
242: $hash{'to_'.$comesfrom}.=','.$linkid;
243: } else {
244: $hash{'to_'.$comesfrom}=''.$linkid;
245: }
246: if (defined($hash{'from_'.$goesto})) {
247: $hash{'from_'.$goesto}.=','.$linkid;
248: } else {
249: $hash{'from_'.$goesto}=''.$linkid;
250: }
251: } elsif ($token->[1] eq 'param') {
252: # ------------------------------------------------------------------- Parameter
253:
254: my $referid=$lpc.'.'.$token->[2]->{'to'};
255: my $name=$token->[2]->{'name'};
256: my $part;
257: if ($name=~/^parameter_(.*)_/) {
258: $part=$1;
259: } else {
260: $part=0;
261: }
262: $name=~s/^.*_([^_]*)$/$1/;
263: my $newparam=
264: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
265: &Apache::lonnet::escape($part.'.'.$name).'='.
266: &Apache::lonnet::escape($token->[2]->{'value'});
267: if (defined($hash{'param_'.$referid})) {
268: $hash{'param_'.$referid}.='&'.$newparam;
269: } else {
270: $hash{'param_'.$referid}=''.$newparam;
271: }
272: if ($token->[2]->{'name'} eq 'parameter_mapalias') {
273: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
274: }
275: if ($token->[2]->{'name'} eq 'parameter_randompick') {
276: $randompick{$referid}=$token->[2]->{'value'};
277: }
278: if ($token->[2]->{'name'} eq 'parameter_randompickseed') {
279: $randompick{$referid}=$token->[2]->{'value'};
280: }
281: }
282:
283: }
284: }
285:
286: } else {
287: $errtext.='Map not loaded: The file does not exist. ';
288: }
289: }
290:
291: # --------------------------------------------------------- Simplify expression
292:
293: sub simplify {
294: my $expression=shift;
295: # (8)=8
296: $expression=~s/\((\d+)\)/$1/g;
297: # 8&8=8
298: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
299: # 8|8=8
300: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
301: # (5&3)&4=5&3&4
302: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
303: # (((5&3)|(4&6)))=((5&3)|(4&6))
304: $expression=~
305: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
306: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
307: $expression=~
308: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
309: return $expression;
310: }
311:
312: # -------------------------------------------------------- Build condition hash
313:
314: sub traceroute {
315: my ($sofar,$rid,$beenhere)=@_;
316: $sofar=simplify($sofar);
317: unless ($beenhere=~/\&$rid\&/) {
318: $beenhere.=$rid.'&';
319: if (($retfurl eq '') && ($hash{'src_'.$rid})
320: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
321: my ($mapid,$resid)=split(/\./,$rid);
322: $retfurl=$hash{'src_'.$rid}.
323: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
324: &Apache::lonnet::symbclean(
325: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
326: '___'.$resid.'___'.
327: &Apache::lonnet::declutter($hash{'src_'.$rid}));
328: }
329: if (defined($hash{'conditions_'.$rid})) {
330: $hash{'conditions_'.$rid}=simplify(
331: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
332: } else {
333: $hash{'conditions_'.$rid}=$sofar;
334: }
335: if (defined($hash{'is_map_'.$rid})) {
336: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
337: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
338: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
339: $sofar=
340: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
341: }
342: }
343: }
344: if (defined($hash{'to_'.$rid})) {
345: foreach (split(/\,/,$hash{'to_'.$rid})) {
346: my $further=$sofar;
347: if ($hash{'undercond_'.$_}) {
348: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
349: $further=simplify('('.$further.')&('.
350: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
351: } else {
352: $errtext.='Undefined condition ID: '
353: .$hash{'undercond_'.$_}.'. ';
354: }
355: }
356: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
357: }
358: }
359: }
360: }
361:
362: # ------------------------------ Cascading conditions, quick access, parameters
363:
364: sub accinit {
365: my ($uri,$short,$fn)=@_;
366: my %acchash=();
367: my %captured=();
368: my $condcounter=0;
369: $acchash{'acc.cond.'.$short.'.0'}=0;
370: foreach (keys %hash) {
371: if ($_=~/^conditions/) {
372: my $expr=$hash{$_};
373: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
374: my $sub=$_;
375: my $orig=$_;
376: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
377: my $factor=$1;
378: $sub=~s/$factor//g;
379: $sub=~s/^\(/\($factor\(/;
380: $sub.=')';
381: $sub=simplify($sub);
382: $orig=~s/(\W)/\\$1/g;
383: $expr=~s/$orig/$sub/;
384: }
385: $hash{$_}=$expr;
386: unless (defined($captured{$expr})) {
387: $condcounter++;
388: $captured{$expr}=$condcounter;
389: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
390: }
391: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
392: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
393: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
394: foreach (split(/\&/,$hash{$_})) {
395: my ($typename,$value)=split(/\=/,$_);
396: my ($type,$name)=split(/\:/,$typename);
397: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
398: &Apache::lonnet::unescape($value);
399: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
400: &Apache::lonnet::unescape($type);
401: }
402: }
403: }
404: foreach (keys %hash) {
405: if ($_=~/^ids/) {
406: foreach (split(/\,/,$hash{$_})) {
407: my $resid=$_;
408: my $uri=$hash{'src_'.$resid};
409: $uri=~s/^\/adm\/wrapper//;
410: $uri=&Apache::lonnet::declutter($uri);
411: my @uriparts=split(/\//,$uri);
412: my $urifile=$uriparts[$#uriparts];
413: $#uriparts--;
414: my $uripath=join('/',@uriparts);
415: if ($uripath) {
416: my $uricond='0';
417: if (defined($hash{'conditions_'.$resid})) {
418: $uricond=$captured{$hash{'conditions_'.$resid}};
419: }
420: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
421: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
422: /(\&\Q$urifile\E\:[^\&]*)/) {
423: my $replace=$1;
424: my $regexp=$replace;
425: $regexp=~s/\|/\\\|/g;
426: $acchash{'acc.res.'.$short.'.'.$uripath}
427: =~s/$regexp/$replace\|$uricond/;
428: } else {
429: $acchash{'acc.res.'.$short.'.'.$uripath}.=
430: $urifile.':'.$uricond.'&';
431: }
432: } else {
433: $acchash{'acc.res.'.$short.'.'.$uripath}=
434: '&'.$urifile.':'.$uricond.'&';
435: }
436: }
437: }
438: }
439: }
440: $acchash{'acc.res.'.$short.'.'}='&:0&';
441: my $courseuri=$uri;
442: $courseuri=~s/^\/res\///;
443: &Apache::lonnet::delenv('(acc\.|httpref\.)');
444: &Apache::lonnet::appenv(%acchash,
445: "request.course.id" => $short,
446: "request.course.fn" => $fn,
447: "request.course.uri" => $courseuri);
448: }
449:
450: # ------------------------------------- Selectively delete from randompick maps
451:
452: sub pickrandom {
453: my $randomoutentry='';
454: foreach my $rid (keys %randompick) {
455: my $rndpick=$randompick{$rid};
456: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
457: # ------------------------------------------- put existing resources into array
458: my @currentrids=();
459: foreach (sort(keys(%hash))) {
460: if ($_=~/^src_($mpc\.\d+)/) {
461: if ($hash{'src_'.$1}) { push @currentrids, $1; }
462: }
463: }
464: # rids are number.number and we want to numercially sort on
465: # the second number
466: @currentrids=sort {
467: my (undef,$aid)=split(/\./,$a);
468: my (undef,$bid)=split(/\./,$b);
469: $aid <=> $bid;
470: } @currentrids;
471: next if ($#currentrids<$rndpick);
472: # -------------------------------- randomly eliminate the ones that should stay
473: my (undef,$id)=split(/\./,$rid);
474: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
475: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
476: &Apache::lonnet::setup_random_from_rndseed($rndseed);
477: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
478: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
479: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
480: # -------------------------------------------------------- delete the leftovers
481: for (my $k=0; $k<=$#currentrids; $k++) {
482: if ($currentrids[$k]) {
483: $hash{'randomout_'.$currentrids[$k]}=1;
484: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
485: $randomoutentry.='&'.
486: &Apache::lonnet::symbclean(
487: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
488: '___'.$resid.'___'.
489: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
490: ).'&';
491: }
492: }
493: }
494: if ($randomoutentry) {
495: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
496: }
497: }
498:
499: # ---------------------------------------------------- Read map and all submaps
500:
501: sub readmap {
502: my $short=shift;
503: $short=~s/^\///;
504: my %cenv=&Apache::lonnet::coursedescription($short);
505: my $fn=$cenv{'fn'};
506: my $uri;
507: $short=~s/\//\_/g;
508: unless ($uri=$cenv{'url'}) {
509: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
510: "Could not load course $short.</font>");
511: return 'No course data available.';
512: }
513: @cond=('true:normal');
514: unlink($fn.'.db');
515: unlink($fn.'_symb.db');
516: unlink($fn.'.state');
517: unlink($fn.'parms.db');
518: undef %randompick;
519: $retfurl='';
520: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
521: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
522: %hash=();
523: %parmhash=();
524: $errtext='';
525: $pc=0;
526: &processversionfile(%cenv);
527: my $furi=&Apache::lonnet::clutter($uri);
528: $hash{'src_0.0'}=&versiontrack($furi);
529: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
530: $hash{'ids_'.$furi}='0.0';
531: $hash{'is_map_0.0'}=1;
532: loadmap($uri);
533: if (defined($hash{'map_start_'.$uri})) {
534: &traceroute('0',$hash{'map_start_'.$uri},'&');
535: &accinit($uri,$short,$fn);
536: &pickrandom();
537: }
538: # ------------------------------------------------------- Put versions into src
539: foreach (keys %hash) {
540: if ($_=~/^src\_/) {
541: $hash{$_}=&putinversion($hash{$_});
542: }
543: }
544: unless ((untie(%hash)) && (untie(%parmhash))) {
545: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
546: "Could not untie coursemap $fn for $uri.</font>");
547: }
548: {
549: my $cfh;
550: if ($cfh=Apache::File->new(">$fn.state")) {
551: print $cfh join("\n",@cond);
552: } else {
553: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
554: "Could not write statemap $fn for $uri.</font>");
555: }
556: }
557: } else {
558: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
559: "Could not tie coursemap $fn for $uri.</font>");
560: }
561: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
562: # ------------------------------------------------- Check for critical messages
563:
564: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
565: $ENV{'user.name'});
566: if ($what[0]) {
567: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
568: $retfurl='/adm/email?critical=display';
569: }
570: }
571: return ($retfurl,$errtext);
572: }
573:
574: # ------------------------------------------------------- Evaluate state string
575:
576: sub evalstate {
577:
578: my $fn=$ENV{'request.course.fn'}.'.state';
579: my $state='2';
580: if (-e $fn) {
581: my @conditions=();
582: {
583: my $fh=Apache::File->new($fn);
584: @conditions=<$fh>;
585: }
586: my $safeeval = new Safe;
587: my $safehole = new Safe::Hole;
588: $safeeval->permit("entereval");
589: $safeeval->permit(":base_math");
590: $safeeval->deny(":base_io");
591: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
592: foreach (@conditions) {
593: my $line=$_;
594: chomp($line);
595: my ($condition,$weight)=split(/\:/,$_);
596: if ($safeeval->reval($condition)) {
597: if ($weight eq 'force') {
598: $state.='3';
599: } else {
600: $state.='2';
601: }
602: } else {
603: if ($weight eq 'stop') {
604: $state.='0';
605: } else {
606: $state.='1';
607: }
608: }
609: }
610: }
611: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
612: return $state;
613: }
614:
615: 1;
616: __END__
617:
618: =head1 NAME
619:
620: Apache::lonuserstate - Construct and maintain state and binary representation
621: of course for user
622:
623: =head1 SYNOPSIS
624:
625: Invoked by lonroles.pm.
626:
627: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
628:
629: =head1 INTRODUCTION
630:
631: This module constructs and maintains state and binary representation
632: of course for user.
633:
634: This is part of the LearningOnline Network with CAPA project
635: described at http://www.lon-capa.org.
636:
637: =head1 HANDLER SUBROUTINE
638:
639: There is no handler subroutine.
640:
641: =head1 OTHER SUBROUTINES
642:
643: =over 4
644:
645: =item *
646:
647: loadmap() : Loads map from disk
648:
649: =item *
650:
651: simplify() : Simplify expression
652:
653: =item *
654:
655: traceroute() : Build condition hash
656:
657: =item *
658:
659: accinit() : Cascading conditions, quick access, parameters
660:
661: =item *
662:
663: readmap() : Read map and all submaps
664:
665: =item *
666:
667: evalstate() : Evaluate state string
668:
669: =back
670:
671: =cut
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