1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.60 2003/09/19 18:20:35 albertel 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: my %actualversion; # version of resource as loaded now
72: my %setversion; # forced version of resource
73: my %lastversion; # version when CC came in last
74: my $versionmode; # how versioning is handled in this course
75:
76: # --------------------------------------------------------- Loads map from disk
77:
78: sub loadmap {
79: my $uri=shift;
80: if ($hash{'map_pc_'.$uri}) { return OK; }
81:
82: $pc++;
83: my $lpc=$pc;
84: $hash{'map_pc_'.$uri}=$lpc;
85: $hash{'map_id_'.$lpc}=$uri;
86:
87: # Determine and check filename
88: my $fn=&Apache::lonnet::filelocation('',$uri);
89:
90: my $ispage=($fn=~/\.page$/);
91:
92: unless (($fn=~/\.sequence$/) ||
93: ($fn=~/\.page$/)) {
94: $errtext.="Invalid map: $fn\n";
95: return OK;
96: }
97:
98: my $instr=&Apache::lonnet::getfile($fn);
99:
100: unless ($instr eq -1) {
101:
102: # Successfully got file, parse it
103:
104: my $parser = HTML::TokeParser->new(\$instr);
105: my $token;
106:
107: my $linkpc=0;
108:
109: $fn=~/\.(\w+)$/;
110:
111: $hash{'map_type_'.$lpc}=$1;
112:
113: while ($token = $parser->get_token) {
114: if ($token->[0] eq 'S') {
115: if ($token->[1] eq 'resource') {
116: # -------------------------------------------------------------------- Resource
117:
118: my $rid=$lpc.'.'.$token->[2]->{'id'};
119:
120: $hash{'kind_'.$rid}='res';
121: $hash{'title_'.$rid}=$token->[2]->{'title'};
122: my $turi=$token->[2]->{'src'};
123: &Apache::lonnet::do_cache(\%Apache::lonnet::titlecache,
124: &Apache::lonnet::symbclean(
125: &Apache::lonnet::declutter($uri).'___'.
126: $token->[2]->{'id'}.'___'.
127: &Apache::lonnet::declutter($turi)),
128: $token->[2]->{'title'});
129: unless ($ispage) {
130: $turi=~/\.(\w+)$/;
131: my $embstyle=&Apache::loncommon::fileembstyle($1);
132: if ($token->[2]->{'external'} eq 'true') { # external
133: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
134: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
135: if (($embstyle eq 'img') || ($embstyle eq 'emb')
136: || ($embstyle eq 'ssi')) {
137: $turi='/adm/wrapper'.$turi;
138: } elsif ($turi!~/\.(sequence|page)$/) {
139: $turi='/adm/coursedocs/showdoc'.$turi;
140: }
141: } else { # normal internal resource
142: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
143: $turi='/adm/wrapper'.$turi;
144: }
145: }
146: }
147:
148: if (defined($hash{'ids_'.$turi})) {
149: $hash{'ids_'.$turi}.=','.$rid;
150: } else {
151: $hash{'ids_'.$turi}=''.$rid;
152: }
153:
154: if
155: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
156: $turi.='?register=1';
157: }
158:
159: $hash{'src_'.$rid}=$turi;
160:
161: if ($token->[2]->{'external'} eq 'true') {
162: $hash{'ext_'.$rid}='true:';
163: } else {
164: $hash{'ext_'.$rid}='false:';
165: }
166: if ($token->[2]->{'type'}) {
167: $hash{'type_'.$rid}=$token->[2]->{'type'};
168: if ($token->[2]->{'type'} eq 'start') {
169: $hash{'map_start_'.$uri}="$rid";
170: }
171: if ($token->[2]->{'type'} eq 'finish') {
172: $hash{'map_finish_'.$uri}="$rid";
173: }
174: } else {
175: $hash{'type_'.$rid}='normal';
176: }
177:
178: if (($turi=~/\.sequence$/) ||
179: ($turi=~/\.page$/)) {
180: $hash{'is_map_'.$rid}=1;
181: &loadmap($turi);
182: }
183:
184: } elsif ($token->[1] eq 'condition') {
185: # ------------------------------------------------------------------- Condition
186:
187: my $rid=$lpc.'.'.$token->[2]->{'id'};
188:
189: $hash{'kind_'.$rid}='cond';
190: $cond[$#cond+1]=$token->[2]->{'value'};
191: $hash{'condid_'.$rid}=$#cond;
192: if ($token->[2]->{'type'}) {
193: $cond[$#cond].=':'.$token->[2]->{'type'};
194: } else {
195: $cond[$#cond].=':normal';
196: }
197:
198: } elsif ($token->[1] eq 'link') {
199: # ----------------------------------------------------------------------- Links
200:
201: $linkpc++;
202: my $linkid=$lpc.'.'.$linkpc;
203:
204: my $goesto=$lpc.'.'.$token->[2]->{'to'};
205: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
206: my $undercond=0;
207:
208: if ($token->[2]->{'condition'}) {
209: $undercond=$lpc.'.'.$token->[2]->{'condition'};
210: }
211:
212: $hash{'goesto_'.$linkid}=$goesto;
213: $hash{'comesfrom_'.$linkid}=$comesfrom;
214: $hash{'undercond_'.$linkid}=$undercond;
215:
216: if (defined($hash{'to_'.$comesfrom})) {
217: $hash{'to_'.$comesfrom}.=','.$linkid;
218: } else {
219: $hash{'to_'.$comesfrom}=''.$linkid;
220: }
221: if (defined($hash{'from_'.$goesto})) {
222: $hash{'from_'.$goesto}.=','.$linkid;
223: } else {
224: $hash{'from_'.$goesto}=''.$linkid;
225: }
226: } elsif ($token->[1] eq 'param') {
227: # ------------------------------------------------------------------- Parameter
228:
229: my $referid=$lpc.'.'.$token->[2]->{'to'};
230: my $part=$token->[2]->{'part'};
231: unless ($part) { $part=0; }
232: my $newparam=
233: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
234: &Apache::lonnet::escape($part.'.'.
235: $token->[2]->{'name'}).'='.
236: &Apache::lonnet::escape($token->[2]->{'value'});
237: if (defined($hash{'param_'.$referid})) {
238: $hash{'param_'.$referid}.='&'.$newparam;
239: } else {
240: $hash{'param_'.$referid}=''.$newparam;
241: }
242: if ($token->[2]->{'name'} eq 'parameter_mapalias') {
243: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
244: }
245: if ($token->[2]->{'name'} eq 'parameter_randompick') {
246: $randompick{$referid}=$token->[2]->{'value'};
247: }
248: if ($token->[2]->{'name'} eq 'parameter_randompickseed') {
249: $randompick{$referid}=$token->[2]->{'value'};
250: }
251: }
252:
253: }
254: }
255:
256: } else {
257: $errtext.='Map not loaded: The file does not exist. ';
258: }
259: }
260:
261: # --------------------------------------------------------- Simplify expression
262:
263: sub simplify {
264: my $expression=shift;
265: # (8)=8
266: $expression=~s/\((\d+)\)/$1/g;
267: # 8&8=8
268: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
269: # 8|8=8
270: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
271: # (5&3)&4=5&3&4
272: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
273: # (((5&3)|(4&6)))=((5&3)|(4&6))
274: $expression=~
275: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
276: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
277: $expression=~
278: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
279: return $expression;
280: }
281:
282: # -------------------------------------------------------- Build condition hash
283:
284: sub traceroute {
285: my ($sofar,$rid,$beenhere)=@_;
286: $sofar=simplify($sofar);
287: unless ($beenhere=~/\&$rid\&/) {
288: $beenhere.=$rid.'&';
289: if (($retfurl eq '') && ($hash{'src_'.$rid})
290: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
291: my ($mapid,$resid)=split(/\./,$rid);
292: $retfurl=$hash{'src_'.$rid}.
293: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
294: &Apache::lonnet::symbclean(
295: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
296: '___'.$resid.'___'.
297: &Apache::lonnet::declutter($hash{'src_'.$rid}));
298: }
299: if (defined($hash{'conditions_'.$rid})) {
300: $hash{'conditions_'.$rid}=simplify(
301: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
302: } else {
303: $hash{'conditions_'.$rid}=$sofar;
304: }
305: if (defined($hash{'is_map_'.$rid})) {
306: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
307: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
308: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
309: $sofar=
310: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
311: }
312: }
313: }
314: if (defined($hash{'to_'.$rid})) {
315: foreach (split(/\,/,$hash{'to_'.$rid})) {
316: my $further=$sofar;
317: if ($hash{'undercond_'.$_}) {
318: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
319: $further=simplify('('.$further.')&('.
320: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
321: } else {
322: $errtext.='Undefined condition ID: '
323: .$hash{'undercond_'.$_}.'. ';
324: }
325: }
326: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
327: }
328: }
329: }
330: }
331:
332: # ------------------------------ Cascading conditions, quick access, parameters
333:
334: sub accinit {
335: my ($uri,$short,$fn)=@_;
336: my %acchash=();
337: my %captured=();
338: my $condcounter=0;
339: $acchash{'acc.cond.'.$short.'.0'}=0;
340: foreach (keys %hash) {
341: if ($_=~/^conditions/) {
342: my $expr=$hash{$_};
343: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
344: my $sub=$_;
345: my $orig=$_;
346: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
347: my $factor=$1;
348: $sub=~s/$factor//g;
349: $sub=~s/^\(/\($factor\(/;
350: $sub.=')';
351: $sub=simplify($sub);
352: $orig=~s/(\W)/\\$1/g;
353: $expr=~s/$orig/$sub/;
354: }
355: $hash{$_}=$expr;
356: unless (defined($captured{$expr})) {
357: $condcounter++;
358: $captured{$expr}=$condcounter;
359: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
360: }
361: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
362: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
363: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
364: foreach (split(/\&/,$hash{$_})) {
365: my ($typename,$value)=split(/\=/,$_);
366: my ($type,$name)=split(/\:/,$typename);
367: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
368: &Apache::lonnet::unescape($value);
369: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
370: &Apache::lonnet::unescape($type);
371: }
372: }
373: }
374: foreach (keys %hash) {
375: if ($_=~/^ids/) {
376: foreach (split(/\,/,$hash{$_})) {
377: my $resid=$_;
378: my $uri=$hash{'src_'.$resid};
379: $uri=~s/^\/adm\/wrapper//;
380: $uri=&Apache::lonnet::declutter($uri);
381: my @uriparts=split(/\//,$uri);
382: my $urifile=$uriparts[$#uriparts];
383: $#uriparts--;
384: my $uripath=join('/',@uriparts);
385: if ($uripath) {
386: my $uricond='0';
387: if (defined($hash{'conditions_'.$resid})) {
388: $uricond=$captured{$hash{'conditions_'.$resid}};
389: }
390: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
391: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
392: /(\&\Q$urifile\E\:[^\&]*)/) {
393: my $replace=$1;
394: my $regexp=$replace;
395: $regexp=~s/\|/\\\|/g;
396: $acchash{'acc.res.'.$short.'.'.$uripath}
397: =~s/$regexp/$replace\|$uricond/;
398: } else {
399: $acchash{'acc.res.'.$short.'.'.$uripath}.=
400: $urifile.':'.$uricond.'&';
401: }
402: } else {
403: $acchash{'acc.res.'.$short.'.'.$uripath}=
404: '&'.$urifile.':'.$uricond.'&';
405: }
406: }
407: }
408: }
409: }
410: $acchash{'acc.res.'.$short.'.'}='&:0&';
411: my $courseuri=$uri;
412: $courseuri=~s/^\/res\///;
413: &Apache::lonnet::delenv('(acc\.|httpref\.)');
414: &Apache::lonnet::appenv(%acchash,
415: "request.course.id" => $short,
416: "request.course.fn" => $fn,
417: "request.course.uri" => $courseuri);
418: }
419:
420: # ------------------------------------- Selectively delete from randompick maps
421:
422: sub pickrandom {
423: my $randomoutentry='';
424: foreach my $rid (keys %randompick) {
425: my $rndpick=$randompick{$rid};
426: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
427: # ------------------------------------------- put existing resources into array
428: my @currentrids=();
429: foreach (sort(keys(%hash))) {
430: if ($_=~/^src_($mpc\.\d+)/) {
431: if ($hash{'src_'.$1}) { push @currentrids, $1; }
432: }
433: }
434: # rids are number.number and we want to numercially sort on
435: # the second number
436: @currentrids=sort {
437: my (undef,$aid)=split(/\./,$a);
438: my (undef,$bid)=split(/\./,$b);
439: $aid <=> $bid;
440: } @currentrids;
441: next if ($#currentrids<$rndpick);
442: # -------------------------------- randomly eliminate the ones that should stay
443: my (undef,$id)=split(/\./,$rid);
444: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
445: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
446: &Apache::lonnet::setup_random_from_rndseed($rndseed);
447: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
448: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
449: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
450: # -------------------------------------------------------- delete the leftovers
451: for (my $k=0; $k<=$#currentrids; $k++) {
452: if ($currentrids[$k]) {
453: $hash{'randomout_'.$currentrids[$k]}=1;
454: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
455: $randomoutentry.='&'.
456: &Apache::lonnet::symbclean(
457: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
458: '___'.$resid.'___'.
459: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
460: ).'&';
461: }
462: }
463: }
464: if ($randomoutentry) {
465: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
466: }
467: }
468:
469: # ---------------------------------------------------- Read map and all submaps
470:
471: sub readmap {
472: my $short=shift;
473: $short=~s/^\///;
474: my %cenv=&Apache::lonnet::coursedescription($short);
475: my $fn=$cenv{'fn'};
476: my $uri;
477: $short=~s/\//\_/g;
478: unless ($uri=$cenv{'url'}) {
479: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
480: "Could not load course $short.</font>");
481: return 'No course data available.';
482: }
483: @cond=('true:normal');
484: unlink($fn.'.db');
485: unlink($fn.'_symb.db');
486: unlink($fn.'.state');
487: unlink($fn.'parms.db');
488: undef %randompick;
489: $retfurl='';
490: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
491: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
492: %hash=();
493: %parmhash=();
494: $errtext='';
495: $pc=0;
496: my $furi=&Apache::lonnet::clutter($uri);
497: $hash{'src_0.0'}=$furi;
498: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
499: $hash{'ids_'.$furi}='0.0';
500: $hash{'is_map_0.0'}=1;
501: loadmap($uri);
502: if (defined($hash{'map_start_'.$uri})) {
503: &traceroute('0',$hash{'map_start_'.$uri},'&');
504: &accinit($uri,$short,$fn);
505: &pickrandom();
506: }
507: # ------------------------------------------------------------ Version tracking
508: # if (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'})) {
509: # &Apache::lonnet::logthis('Will be version tracking');
510: # }
511: unless ((untie(%hash)) && (untie(%parmhash))) {
512: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
513: "Could not untie coursemap $fn for $uri.</font>");
514: }
515: {
516: my $cfh;
517: if ($cfh=Apache::File->new(">$fn.state")) {
518: print $cfh join("\n",@cond);
519: } else {
520: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
521: "Could not write statemap $fn for $uri.</font>");
522: }
523: }
524: } else {
525: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
526: "Could not tie coursemap $fn for $uri.</font>");
527: }
528: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
529: # ------------------------------------------------- Check for critical messages
530:
531: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
532: $ENV{'user.name'});
533: if ($what[0]) {
534: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
535: $retfurl='/adm/email?critical=display';
536: }
537: }
538: return ($retfurl,$errtext);
539: }
540:
541: # ------------------------------------------------------- Evaluate state string
542:
543: sub evalstate {
544:
545: my $fn=$ENV{'request.course.fn'}.'.state';
546: my $state='2';
547: if (-e $fn) {
548: my @conditions=();
549: {
550: my $fh=Apache::File->new($fn);
551: @conditions=<$fh>;
552: }
553: my $safeeval = new Safe;
554: my $safehole = new Safe::Hole;
555: $safeeval->permit("entereval");
556: $safeeval->permit(":base_math");
557: $safeeval->deny(":base_io");
558: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
559: foreach (@conditions) {
560: my $line=$_;
561: chomp($line);
562: my ($condition,$weight)=split(/\:/,$_);
563: if ($safeeval->reval($condition)) {
564: if ($weight eq 'force') {
565: $state.='3';
566: } else {
567: $state.='2';
568: }
569: } else {
570: if ($weight eq 'stop') {
571: $state.='0';
572: } else {
573: $state.='1';
574: }
575: }
576: }
577: }
578: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
579: return $state;
580: }
581:
582: 1;
583: __END__
584:
585: =head1 NAME
586:
587: Apache::lonuserstate - Construct and maintain state and binary representation
588: of course for user
589:
590: =head1 SYNOPSIS
591:
592: Invoked by lonroles.pm.
593:
594: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
595:
596: =head1 INTRODUCTION
597:
598: This module constructs and maintains state and binary representation
599: of course for user.
600:
601: This is part of the LearningOnline Network with CAPA project
602: described at http://www.lon-capa.org.
603:
604: =head1 HANDLER SUBROUTINE
605:
606: There is no handler subroutine.
607:
608: =head1 OTHER SUBROUTINES
609:
610: =over 4
611:
612: =item *
613:
614: loadmap() : Loads map from disk
615:
616: =item *
617:
618: simplify() : Simplify expression
619:
620: =item *
621:
622: traceroute() : Build condition hash
623:
624: =item *
625:
626: accinit() : Cascading conditions, quick access, parameters
627:
628: =item *
629:
630: readmap() : Read map and all submaps
631:
632: =item *
633:
634: evalstate() : Evaluate state string
635:
636: =back
637:
638: =cut
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