1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.71 2004/02/02 00:46:51 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=~/\S/) { # 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: # Store reverse lookup, remove query string
176: my $idsuri=$turi;
177: $idsuri=~s/\?.+$//;
178: if (defined($hash{'ids_'.$idsuri})) {
179: $hash{'ids_'.$idsuri}.=','.$rid;
180: } else {
181: $hash{'ids_'.$idsuri}=''.$rid;
182: }
183:
184: if
185: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
186: $turi.='?register=1';
187: }
188:
189: $hash{'src_'.$rid}=$turi;
190:
191: if ($token->[2]->{'external'} eq 'true') {
192: $hash{'ext_'.$rid}='true:';
193: } else {
194: $hash{'ext_'.$rid}='false:';
195: }
196: if ($token->[2]->{'type'}) {
197: $hash{'type_'.$rid}=$token->[2]->{'type'};
198: if ($token->[2]->{'type'} eq 'start') {
199: $hash{'map_start_'.$uri}="$rid";
200: }
201: if ($token->[2]->{'type'} eq 'finish') {
202: $hash{'map_finish_'.$uri}="$rid";
203: }
204: } else {
205: $hash{'type_'.$rid}='normal';
206: }
207:
208: if (($turi=~/\.sequence$/) ||
209: ($turi=~/\.page$/)) {
210: $hash{'is_map_'.$rid}=1;
211: &loadmap($turi);
212: }
213:
214: } elsif ($token->[1] eq 'condition') {
215: # ------------------------------------------------------------------- Condition
216:
217: my $rid=$lpc.'.'.$token->[2]->{'id'};
218:
219: $hash{'kind_'.$rid}='cond';
220: $cond[$#cond+1]=$token->[2]->{'value'};
221: $hash{'condid_'.$rid}=$#cond;
222: if ($token->[2]->{'type'}) {
223: $cond[$#cond].=':'.$token->[2]->{'type'};
224: } else {
225: $cond[$#cond].=':normal';
226: }
227:
228: } elsif ($token->[1] eq 'link') {
229: # ----------------------------------------------------------------------- Links
230:
231: $linkpc++;
232: my $linkid=$lpc.'.'.$linkpc;
233:
234: my $goesto=$lpc.'.'.$token->[2]->{'to'};
235: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
236: my $undercond=0;
237:
238: if ($token->[2]->{'condition'}) {
239: $undercond=$lpc.'.'.$token->[2]->{'condition'};
240: }
241:
242: $hash{'goesto_'.$linkid}=$goesto;
243: $hash{'comesfrom_'.$linkid}=$comesfrom;
244: $hash{'undercond_'.$linkid}=$undercond;
245:
246: if (defined($hash{'to_'.$comesfrom})) {
247: $hash{'to_'.$comesfrom}.=','.$linkid;
248: } else {
249: $hash{'to_'.$comesfrom}=''.$linkid;
250: }
251: if (defined($hash{'from_'.$goesto})) {
252: $hash{'from_'.$goesto}.=','.$linkid;
253: } else {
254: $hash{'from_'.$goesto}=''.$linkid;
255: }
256: } elsif ($token->[1] eq 'param') {
257: # ------------------------------------------------------------------- Parameter
258:
259: my $referid=$lpc.'.'.$token->[2]->{'to'};
260: my $name=$token->[2]->{'name'};
261: my $part;
262: if ($name=~/^parameter_(.*)_/) {
263: $part=$1;
264: } else {
265: $part=0;
266: }
267: $name=~s/^.*_([^_]*)$/$1/;
268: my $newparam=
269: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
270: &Apache::lonnet::escape($part.'.'.$name).'='.
271: &Apache::lonnet::escape($token->[2]->{'value'});
272: if (defined($hash{'param_'.$referid})) {
273: $hash{'param_'.$referid}.='&'.$newparam;
274: } else {
275: $hash{'param_'.$referid}=''.$newparam;
276: }
277: if ($token->[2]->{'name'} eq 'parameter_mapalias') {
278: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
279: }
280: if ($token->[2]->{'name'} eq 'parameter_randompick') {
281: $randompick{$referid}=$token->[2]->{'value'};
282: }
283: if ($token->[2]->{'name'} eq 'parameter_randompickseed') {
284: $randompick{$referid}=$token->[2]->{'value'};
285: }
286: }
287:
288: }
289: }
290:
291: } else {
292: $errtext.='Map not loaded: The file does not exist. ';
293: }
294: }
295:
296: # --------------------------------------------------------- Simplify expression
297:
298: sub simplify {
299: my $expression=shift;
300: # (8)=8
301: $expression=~s/\((\d+)\)/$1/g;
302: # 8&8=8
303: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
304: # 8|8=8
305: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
306: # (5&3)&4=5&3&4
307: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
308: # (((5&3)|(4&6)))=((5&3)|(4&6))
309: $expression=~
310: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
311: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
312: $expression=~
313: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
314: return $expression;
315: }
316:
317: # -------------------------------------------------------- Build condition hash
318:
319: sub traceroute {
320: my ($sofar,$rid,$beenhere)=@_;
321: $sofar=simplify($sofar);
322: unless ($beenhere=~/\&$rid\&/) {
323: $beenhere.=$rid.'&';
324: if (($retfurl eq '') && ($hash{'src_'.$rid})
325: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
326: my ($mapid,$resid)=split(/\./,$rid);
327: $retfurl=$hash{'src_'.$rid}.
328: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
329: &Apache::lonnet::symbclean(
330: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
331: '___'.$resid.'___'.
332: &Apache::lonnet::declutter($hash{'src_'.$rid}));
333: }
334: if (defined($hash{'conditions_'.$rid})) {
335: $hash{'conditions_'.$rid}=simplify(
336: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
337: } else {
338: $hash{'conditions_'.$rid}=$sofar;
339: }
340: if (defined($hash{'is_map_'.$rid})) {
341: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
342: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
343: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
344: $sofar=
345: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
346: }
347: }
348: }
349: if (defined($hash{'to_'.$rid})) {
350: foreach (split(/\,/,$hash{'to_'.$rid})) {
351: my $further=$sofar;
352: if ($hash{'undercond_'.$_}) {
353: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
354: $further=simplify('('.$further.')&('.
355: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
356: } else {
357: $errtext.='Undefined condition ID: '
358: .$hash{'undercond_'.$_}.'. ';
359: }
360: }
361: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
362: }
363: }
364: }
365: }
366:
367: # ------------------------------ Cascading conditions, quick access, parameters
368:
369: sub accinit {
370: my ($uri,$short,$fn)=@_;
371: my %acchash=();
372: my %captured=();
373: my $condcounter=0;
374: $acchash{'acc.cond.'.$short.'.0'}=0;
375: foreach (keys %hash) {
376: if ($_=~/^conditions/) {
377: my $expr=$hash{$_};
378: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
379: my $sub=$_;
380: my $orig=$_;
381: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
382: my $factor=$1;
383: $sub=~s/$factor//g;
384: $sub=~s/^\(/\($factor\(/;
385: $sub.=')';
386: $sub=simplify($sub);
387: $orig=~s/(\W)/\\$1/g;
388: $expr=~s/$orig/$sub/;
389: }
390: $hash{$_}=$expr;
391: unless (defined($captured{$expr})) {
392: $condcounter++;
393: $captured{$expr}=$condcounter;
394: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
395: }
396: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
397: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
398: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
399: foreach (split(/\&/,$hash{$_})) {
400: my ($typename,$value)=split(/\=/,$_);
401: my ($type,$name)=split(/\:/,$typename);
402: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
403: &Apache::lonnet::unescape($value);
404: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
405: &Apache::lonnet::unescape($type);
406: }
407: }
408: }
409: foreach (keys %hash) {
410: if ($_=~/^ids/) {
411: foreach (split(/\,/,$hash{$_})) {
412: my $resid=$_;
413: my $uri=$hash{'src_'.$resid};
414: $uri=~s/^\/adm\/wrapper//;
415: $uri=&Apache::lonnet::declutter($uri);
416: my @uriparts=split(/\//,$uri);
417: my $urifile=$uriparts[$#uriparts];
418: $#uriparts--;
419: my $uripath=join('/',@uriparts);
420: if ($uripath) {
421: my $uricond='0';
422: if (defined($hash{'conditions_'.$resid})) {
423: $uricond=$captured{$hash{'conditions_'.$resid}};
424: }
425: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
426: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
427: /(\&\Q$urifile\E\:[^\&]*)/) {
428: my $replace=$1;
429: my $regexp=$replace;
430: $regexp=~s/\|/\\\|/g;
431: $acchash{'acc.res.'.$short.'.'.$uripath}
432: =~s/$regexp/$replace\|$uricond/;
433: } else {
434: $acchash{'acc.res.'.$short.'.'.$uripath}.=
435: $urifile.':'.$uricond.'&';
436: }
437: } else {
438: $acchash{'acc.res.'.$short.'.'.$uripath}=
439: '&'.$urifile.':'.$uricond.'&';
440: }
441: }
442: }
443: }
444: }
445: $acchash{'acc.res.'.$short.'.'}='&:0&';
446: my $courseuri=$uri;
447: $courseuri=~s/^\/res\///;
448: &Apache::lonnet::delenv('(acc\.|httpref\.)');
449: &Apache::lonnet::appenv(%acchash,
450: "request.course.id" => $short,
451: "request.course.fn" => $fn,
452: "request.course.uri" => $courseuri);
453: }
454:
455: # ------------------------------------- Selectively delete from randompick maps
456:
457: sub pickrandom {
458: my $randomoutentry='';
459: foreach my $rid (keys %randompick) {
460: my $rndpick=$randompick{$rid};
461: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
462: # ------------------------------------------- put existing resources into array
463: my @currentrids=();
464: foreach (sort(keys(%hash))) {
465: if ($_=~/^src_($mpc\.\d+)/) {
466: if ($hash{'src_'.$1}) { push @currentrids, $1; }
467: }
468: }
469: # rids are number.number and we want to numercially sort on
470: # the second number
471: @currentrids=sort {
472: my (undef,$aid)=split(/\./,$a);
473: my (undef,$bid)=split(/\./,$b);
474: $aid <=> $bid;
475: } @currentrids;
476: next if ($#currentrids<$rndpick);
477: # -------------------------------- randomly eliminate the ones that should stay
478: my (undef,$id)=split(/\./,$rid);
479: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
480: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
481: &Apache::lonnet::setup_random_from_rndseed($rndseed);
482: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
483: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
484: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
485: # -------------------------------------------------------- delete the leftovers
486: for (my $k=0; $k<=$#currentrids; $k++) {
487: if ($currentrids[$k]) {
488: $hash{'randomout_'.$currentrids[$k]}=1;
489: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
490: $randomoutentry.='&'.
491: &Apache::lonnet::symbclean(
492: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
493: '___'.$resid.'___'.
494: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
495: ).'&';
496: }
497: }
498: }
499: if ($randomoutentry) {
500: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
501: }
502: }
503:
504: # ---------------------------------------------------- Read map and all submaps
505:
506: sub readmap {
507: my $short=shift;
508: $short=~s/^\///;
509: my %cenv=&Apache::lonnet::coursedescription($short);
510: my $fn=$cenv{'fn'};
511: my $uri;
512: $short=~s/\//\_/g;
513: unless ($uri=$cenv{'url'}) {
514: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
515: "Could not load course $short.</font>");
516: return 'No course data available.';
517: }
518: @cond=('true:normal');
519: unlink($fn.'.db');
520: unlink($fn.'_symb.db');
521: unlink($fn.'.state');
522: unlink($fn.'parms.db');
523: undef %randompick;
524: $retfurl='';
525: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
526: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
527: %hash=();
528: %parmhash=();
529: $errtext='';
530: $pc=0;
531: &processversionfile(%cenv);
532: my $furi=&Apache::lonnet::clutter($uri);
533: $hash{'src_0.0'}=&versiontrack($furi);
534: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
535: $hash{'ids_'.$furi}='0.0';
536: $hash{'is_map_0.0'}=1;
537: loadmap($uri);
538: if (defined($hash{'map_start_'.$uri})) {
539: &traceroute('0',$hash{'map_start_'.$uri},'&');
540: &accinit($uri,$short,$fn);
541: &pickrandom();
542: }
543: # ------------------------------------------------------- Put versions into src
544: foreach (keys %hash) {
545: if ($_=~/^src\_/) {
546: $hash{$_}=&putinversion($hash{$_});
547: }
548: }
549: unless ((untie(%hash)) && (untie(%parmhash))) {
550: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
551: "Could not untie coursemap $fn for $uri.</font>");
552: }
553: {
554: my $cfh;
555: if ($cfh=Apache::File->new(">$fn.state")) {
556: print $cfh join("\n",@cond);
557: } else {
558: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
559: "Could not write statemap $fn for $uri.</font>");
560: }
561: }
562: } else {
563: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
564: "Could not tie coursemap $fn for $uri.</font>");
565: }
566: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
567: # ------------------------------------------------- Check for critical messages
568:
569: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
570: $ENV{'user.name'});
571: if ($what[0]) {
572: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
573: $retfurl='/adm/email?critical=display';
574: }
575: }
576: return ($retfurl,$errtext);
577: }
578:
579: # ------------------------------------------------------- Evaluate state string
580:
581: sub evalstate {
582:
583: my $fn=$ENV{'request.course.fn'}.'.state';
584: my $state='2';
585: if (-e $fn) {
586: my @conditions=();
587: {
588: my $fh=Apache::File->new($fn);
589: @conditions=<$fh>;
590: }
591: my $safeeval = new Safe;
592: my $safehole = new Safe::Hole;
593: $safeeval->permit("entereval");
594: $safeeval->permit(":base_math");
595: $safeeval->deny(":base_io");
596: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
597: foreach (@conditions) {
598: my $line=$_;
599: chomp($line);
600: my ($condition,$weight)=split(/\:/,$_);
601: if ($safeeval->reval($condition)) {
602: if ($weight eq 'force') {
603: $state.='3';
604: } else {
605: $state.='2';
606: }
607: } else {
608: if ($weight eq 'stop') {
609: $state.='0';
610: } else {
611: $state.='1';
612: }
613: }
614: }
615: }
616: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
617: return $state;
618: }
619:
620: 1;
621: __END__
622:
623: =head1 NAME
624:
625: Apache::lonuserstate - Construct and maintain state and binary representation
626: of course for user
627:
628: =head1 SYNOPSIS
629:
630: Invoked by lonroles.pm.
631:
632: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
633:
634: =head1 INTRODUCTION
635:
636: This module constructs and maintains state and binary representation
637: of course for user.
638:
639: This is part of the LearningOnline Network with CAPA project
640: described at http://www.lon-capa.org.
641:
642: =head1 HANDLER SUBROUTINE
643:
644: There is no handler subroutine.
645:
646: =head1 OTHER SUBROUTINES
647:
648: =over 4
649:
650: =item *
651:
652: loadmap() : Loads map from disk
653:
654: =item *
655:
656: simplify() : Simplify expression
657:
658: =item *
659:
660: traceroute() : Build condition hash
661:
662: =item *
663:
664: accinit() : Cascading conditions, quick access, parameters
665:
666: =item *
667:
668: readmap() : Read map and all submaps
669:
670: =item *
671:
672: evalstate() : Evaluate state string
673:
674: =back
675:
676: =cut
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