1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.73 2004/04/23 15:23:35 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: use Apache::lonenc;
45:
46: # ---------------------------------------------------- Globals for this package
47:
48: my $pc; # Package counter
49: my %hash; # The big tied hash
50: my %parmhash;# The hash with the parameters
51: my @cond; # Array with all of the conditions
52: my $errtext; # variable with all errors
53: my $retfurl; # variable with the very first URL in the course
54: my %randompick; # randomly picked resources
55: my %randompickseed; # optional seed for randomly picking resources
56: my %encurl; # URLs in this folder are supposed to be encrypted
57: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
58:
59: # ----------------------------------- Remove version from URL and store in hash
60:
61: sub versiontrack {
62: my $uri=shift;
63: if ($uri=~/\.(\d+)\.\w+$/) {
64: my $version=$1;
65: $uri=~s/\.\d+\.(\w+)$/\.$1/;
66: unless ($hash{'version_'.$uri}) {
67: $hash{'version_'.$uri}=$version;
68: }
69: }
70: return $uri;
71: }
72:
73: # -------------------------------------------------------------- Put in version
74:
75: sub putinversion {
76: my $uri=shift;
77: if ($hash{'version_'.$uri}) {
78: my $version=$hash{'version_'.$uri};
79: if ($version eq 'mostrecent') { return $uri; }
80: if ($version eq &Apache::lonnet::getversion(
81: &Apache::lonnet::filelocation('',$uri)))
82: { return $uri; }
83: $uri=~s/\.(\w+)$/\.$version\.$1/;
84: }
85: return $uri;
86: }
87:
88: # ----------------------------------------- Processing versions file for course
89:
90: sub processversionfile {
91: my %cenv=@_;
92: my %versions=&Apache::lonnet::dump('resourceversions',
93: $cenv{'domain'},
94: $cenv{'num'});
95: foreach (keys %versions) {
96: if ($_=~/^error\:/) { return; }
97: $hash{'version_'.$_}=$versions{$_};
98: }
99: }
100:
101: # --------------------------------------------------------- Loads map from disk
102:
103: sub loadmap {
104: my $uri=shift;
105: if ($hash{'map_pc_'.$uri}) { return OK; }
106:
107: $pc++;
108: my $lpc=$pc;
109: $hash{'map_pc_'.$uri}=$lpc;
110: $hash{'map_id_'.$lpc}=$uri;
111:
112: # Determine and check filename
113: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
114:
115: my $ispage=($fn=~/\.page$/);
116:
117: unless (($fn=~/\.sequence$/) ||
118: ($fn=~/\.page$/)) {
119: $errtext.="Invalid map: $fn\n";
120: return OK;
121: }
122:
123: my $instr=&Apache::lonnet::getfile($fn);
124:
125: unless ($instr eq -1) {
126:
127: # Successfully got file, parse it
128:
129: my $parser = HTML::TokeParser->new(\$instr);
130: my $token;
131:
132: my $linkpc=0;
133:
134: $fn=~/\.(\w+)$/;
135:
136: $hash{'map_type_'.$lpc}=$1;
137:
138: while ($token = $parser->get_token) {
139: if ($token->[0] eq 'S') {
140: if ($token->[1] eq 'resource') {
141: # -------------------------------------------------------------------- Resource
142:
143: my $rid=$lpc.'.'.$token->[2]->{'id'};
144:
145: $hash{'kind_'.$rid}='res';
146: $hash{'title_'.$rid}=$token->[2]->{'title'};
147: my $turi=&versiontrack($token->[2]->{'src'});
148: if ($token->[2]->{'version'}) {
149: unless ($hash{'version_'.$turi}) {
150: $hash{'version_'.$turi}=$1;
151: }
152: }
153: &Apache::lonnet::do_cache(\%Apache::lonnet::titlecache,
154: &Apache::lonnet::encode_symb($uri,$token->[2]->{'id'},
155: $turi),
156: $token->[2]->{'title'},'title');
157: unless ($ispage) {
158: $turi=~/\.(\w+)$/;
159: my $embstyle=&Apache::loncommon::fileembstyle($1);
160: if ($token->[2]->{'external'} eq 'true') { # external
161: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
162: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
163: if (($embstyle eq 'img') || ($embstyle eq 'emb')
164: || ($embstyle eq 'ssi')) {
165: unless ($turi =~/\.page$/) {
166: $turi='/adm/wrapper'.$turi;
167: }
168: } elsif ($turi!~/\.(sequence|page)$/) {
169: $turi='/adm/coursedocs/showdoc'.$turi;
170: }
171: } elsif ($turi=~/\S/) { # normal non-empty internal resource
172: my $mapdir=$uri;
173: $mapdir=~s/[^\/]+$//;
174: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
175: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
176: $turi='/adm/wrapper'.$turi;
177: }
178: }
179: }
180: # Store reverse lookup, remove query string
181: my $idsuri=$turi;
182: $idsuri=~s/\?.+$//;
183: if (defined($hash{'ids_'.$idsuri})) {
184: $hash{'ids_'.$idsuri}.=','.$rid;
185: } else {
186: $hash{'ids_'.$idsuri}=''.$rid;
187: }
188:
189: if
190: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
191: $turi.='?register=1';
192: }
193:
194: $hash{'src_'.$rid}=$turi;
195:
196: if ($token->[2]->{'external'} eq 'true') {
197: $hash{'ext_'.$rid}='true:';
198: } else {
199: $hash{'ext_'.$rid}='false:';
200: }
201: if ($token->[2]->{'type'}) {
202: $hash{'type_'.$rid}=$token->[2]->{'type'};
203: if ($token->[2]->{'type'} eq 'start') {
204: $hash{'map_start_'.$uri}="$rid";
205: }
206: if ($token->[2]->{'type'} eq 'finish') {
207: $hash{'map_finish_'.$uri}="$rid";
208: }
209: } else {
210: $hash{'type_'.$rid}='normal';
211: }
212:
213: if (($turi=~/\.sequence$/) ||
214: ($turi=~/\.page$/)) {
215: $hash{'is_map_'.$rid}=1;
216: &loadmap($turi);
217: }
218:
219: } elsif ($token->[1] eq 'condition') {
220: # ------------------------------------------------------------------- Condition
221:
222: my $rid=$lpc.'.'.$token->[2]->{'id'};
223:
224: $hash{'kind_'.$rid}='cond';
225: $cond[$#cond+1]=$token->[2]->{'value'};
226: $hash{'condid_'.$rid}=$#cond;
227: if ($token->[2]->{'type'}) {
228: $cond[$#cond].=':'.$token->[2]->{'type'};
229: } else {
230: $cond[$#cond].=':normal';
231: }
232:
233: } elsif ($token->[1] eq 'link') {
234: # ----------------------------------------------------------------------- Links
235:
236: $linkpc++;
237: my $linkid=$lpc.'.'.$linkpc;
238:
239: my $goesto=$lpc.'.'.$token->[2]->{'to'};
240: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
241: my $undercond=0;
242:
243: if ($token->[2]->{'condition'}) {
244: $undercond=$lpc.'.'.$token->[2]->{'condition'};
245: }
246:
247: $hash{'goesto_'.$linkid}=$goesto;
248: $hash{'comesfrom_'.$linkid}=$comesfrom;
249: $hash{'undercond_'.$linkid}=$undercond;
250:
251: if (defined($hash{'to_'.$comesfrom})) {
252: $hash{'to_'.$comesfrom}.=','.$linkid;
253: } else {
254: $hash{'to_'.$comesfrom}=''.$linkid;
255: }
256: if (defined($hash{'from_'.$goesto})) {
257: $hash{'from_'.$goesto}.=','.$linkid;
258: } else {
259: $hash{'from_'.$goesto}=''.$linkid;
260: }
261: } elsif ($token->[1] eq 'param') {
262: # ------------------------------------------------------------------- Parameter
263:
264: my $referid=$lpc.'.'.$token->[2]->{'to'};
265: my $name=$token->[2]->{'name'};
266: my $part;
267: if ($name=~/^parameter_(.*)_/) {
268: $part=$1;
269: } else {
270: $part=0;
271: }
272: $name=~s/^.*_([^_]*)$/$1/;
273: my $newparam=
274: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
275: &Apache::lonnet::escape($part.'.'.$name).'='.
276: &Apache::lonnet::escape($token->[2]->{'value'});
277: if (defined($hash{'param_'.$referid})) {
278: $hash{'param_'.$referid}.='&'.$newparam;
279: } else {
280: $hash{'param_'.$referid}=''.$newparam;
281: }
282: if ($token->[2]->{'name'} eq 'parameter_mapalias') {
283: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
284: }
285: if ($token->[2]->{'name'} eq 'parameter_randompick') {
286: $randompick{$referid}=$token->[2]->{'value'};
287: }
288: if ($token->[2]->{'name'} eq 'parameter_randompickseed') {
289: $randompick{$referid}=$token->[2]->{'value'};
290: }
291: if ($token->[2]->{'name'} eq 'parameter_encrypturl') {
292: $encurl{$referid}=$token->[2]->{'value'};
293: }
294: if ($token->[2]->{'name'} eq 'parameter_hiddenresource') {
295: $hiddenurl{$referid}=$token->[2]->{'value'};
296: }
297: }
298:
299: }
300: }
301:
302: } else {
303: $errtext.='Map not loaded: The file does not exist. ';
304: }
305: }
306:
307: # --------------------------------------------------------- Simplify expression
308:
309: sub simplify {
310: my $expression=shift;
311: # (8)=8
312: $expression=~s/\((\d+)\)/$1/g;
313: # 8&8=8
314: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
315: # 8|8=8
316: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
317: # (5&3)&4=5&3&4
318: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
319: # (((5&3)|(4&6)))=((5&3)|(4&6))
320: $expression=~
321: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
322: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
323: $expression=~
324: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
325: return $expression;
326: }
327:
328: # -------------------------------------------------------- Build condition hash
329:
330: sub traceroute {
331: my ($sofar,$rid,$beenhere)=@_;
332: $sofar=simplify($sofar);
333: unless ($beenhere=~/\&$rid\&/) {
334: $beenhere.=$rid.'&';
335: if (($retfurl eq '') && ($hash{'src_'.$rid})
336: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
337: my ($mapid,$resid)=split(/\./,$rid);
338: $retfurl=$hash{'src_'.$rid}.
339: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
340: &Apache::lonnet::symbclean(
341: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
342: '___'.$resid.'___'.
343: &Apache::lonnet::declutter($hash{'src_'.$rid}));
344: }
345: if (defined($hash{'conditions_'.$rid})) {
346: $hash{'conditions_'.$rid}=simplify(
347: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
348: } else {
349: $hash{'conditions_'.$rid}=$sofar;
350: }
351: if (defined($hash{'is_map_'.$rid})) {
352: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
353: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
354: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
355: $sofar=
356: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
357: }
358: }
359: }
360: if (defined($hash{'to_'.$rid})) {
361: foreach (split(/\,/,$hash{'to_'.$rid})) {
362: my $further=$sofar;
363: if ($hash{'undercond_'.$_}) {
364: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
365: $further=simplify('('.$further.')&('.
366: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
367: } else {
368: $errtext.='Undefined condition ID: '
369: .$hash{'undercond_'.$_}.'. ';
370: }
371: }
372: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
373: }
374: }
375: }
376: }
377:
378: # ------------------------------ Cascading conditions, quick access, parameters
379:
380: sub accinit {
381: my ($uri,$short,$fn)=@_;
382: my %acchash=();
383: my %captured=();
384: my $condcounter=0;
385: $acchash{'acc.cond.'.$short.'.0'}=0;
386: foreach (keys %hash) {
387: if ($_=~/^conditions/) {
388: my $expr=$hash{$_};
389: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
390: my $sub=$_;
391: my $orig=$_;
392: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
393: my $factor=$1;
394: $sub=~s/$factor//g;
395: $sub=~s/^\(/\($factor\(/;
396: $sub.=')';
397: $sub=simplify($sub);
398: $orig=~s/(\W)/\\$1/g;
399: $expr=~s/$orig/$sub/;
400: }
401: $hash{$_}=$expr;
402: unless (defined($captured{$expr})) {
403: $condcounter++;
404: $captured{$expr}=$condcounter;
405: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
406: }
407: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
408: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
409: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
410: foreach (split(/\&/,$hash{$_})) {
411: my ($typename,$value)=split(/\=/,$_);
412: my ($type,$name)=split(/\:/,$typename);
413: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
414: &Apache::lonnet::unescape($value);
415: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
416: &Apache::lonnet::unescape($type);
417: }
418: }
419: }
420: foreach (keys %hash) {
421: if ($_=~/^ids/) {
422: foreach (split(/\,/,$hash{$_})) {
423: my $resid=$_;
424: my $uri=$hash{'src_'.$resid};
425: $uri=~s/^\/adm\/wrapper//;
426: $uri=&Apache::lonnet::declutter($uri);
427: my @uriparts=split(/\//,$uri);
428: my $urifile=$uriparts[$#uriparts];
429: $#uriparts--;
430: my $uripath=join('/',@uriparts);
431: if ($uripath) {
432: my $uricond='0';
433: if (defined($hash{'conditions_'.$resid})) {
434: $uricond=$captured{$hash{'conditions_'.$resid}};
435: }
436: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
437: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
438: /(\&\Q$urifile\E\:[^\&]*)/) {
439: my $replace=$1;
440: my $regexp=$replace;
441: $regexp=~s/\|/\\\|/g;
442: $acchash{'acc.res.'.$short.'.'.$uripath}
443: =~s/$regexp/$replace\|$uricond/;
444: } else {
445: $acchash{'acc.res.'.$short.'.'.$uripath}.=
446: $urifile.':'.$uricond.'&';
447: }
448: } else {
449: $acchash{'acc.res.'.$short.'.'.$uripath}=
450: '&'.$urifile.':'.$uricond.'&';
451: }
452: }
453: }
454: }
455: }
456: $acchash{'acc.res.'.$short.'.'}='&:0&';
457: my $courseuri=$uri;
458: $courseuri=~s/^\/res\///;
459: &Apache::lonnet::delenv('(acc\.|httpref\.)');
460: &Apache::lonnet::appenv(%acchash,
461: "request.course.id" => $short,
462: "request.course.fn" => $fn,
463: "request.course.uri" => $courseuri);
464: }
465:
466: # ---------------- Selectively delete from randompick maps and hidden url parms
467:
468: sub hiddenurls {
469: my $randomoutentry='';
470: foreach my $rid (keys %randompick) {
471: my $rndpick=$randompick{$rid};
472: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
473: # ------------------------------------------- put existing resources into array
474: my @currentrids=();
475: foreach (sort(keys(%hash))) {
476: if ($_=~/^src_($mpc\.\d+)/) {
477: if ($hash{'src_'.$1}) { push @currentrids, $1; }
478: }
479: }
480: # rids are number.number and we want to numercially sort on
481: # the second number
482: @currentrids=sort {
483: my (undef,$aid)=split(/\./,$a);
484: my (undef,$bid)=split(/\./,$b);
485: $aid <=> $bid;
486: } @currentrids;
487: next if ($#currentrids<$rndpick);
488: # -------------------------------- randomly eliminate the ones that should stay
489: my (undef,$id)=split(/\./,$rid);
490: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
491: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
492: &Apache::lonnet::setup_random_from_rndseed($rndseed);
493: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
494: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
495: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
496: # -------------------------------------------------------- delete the leftovers
497: for (my $k=0; $k<=$#currentrids; $k++) {
498: if ($currentrids[$k]) {
499: $hash{'randomout_'.$currentrids[$k]}=1;
500: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
501: $randomoutentry.='&'.
502: &Apache::lonnet::symbclean(
503: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
504: '___'.$resid.'___'.
505: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
506: ).'&';
507: }
508: }
509: }
510: # ------------------------------ take care of explicitly hidden urls or folders
511: foreach my $rid (keys %hiddenurl) {
512: $hash{'randomout_'.$rid}=1;
513: my ($mapid,$resid)=split(/\./,$rid);
514: $randomoutentry.='&'.
515: &Apache::lonnet::symbclean(
516: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
517: '___'.$resid.'___'.
518: &Apache::lonnet::declutter($hash{'src_'.$rid})
519: ).'&';
520: }
521: # --------------------------------------- append randomout entry to environment
522: if ($randomoutentry) {
523: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
524: }
525: }
526:
527: # ---------------------------------------------------- Read map and all submaps
528:
529: sub readmap {
530: my $short=shift;
531: $short=~s/^\///;
532: my %cenv=&Apache::lonnet::coursedescription($short);
533: my $fn=$cenv{'fn'};
534: my $uri;
535: $short=~s/\//\_/g;
536: unless ($uri=$cenv{'url'}) {
537: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
538: "Could not load course $short.</font>");
539: return 'No course data available.';
540: }
541: @cond=('true:normal');
542: unlink($fn.'.db');
543: unlink($fn.'_symb.db');
544: unlink($fn.'.state');
545: unlink($fn.'parms.db');
546: undef %randompick;
547: undef %hiddenurl;
548: undef %encurl;
549: $retfurl='';
550: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
551: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
552: %hash=();
553: %parmhash=();
554: $errtext='';
555: $pc=0;
556: &processversionfile(%cenv);
557: my $furi=&Apache::lonnet::clutter($uri);
558: $hash{'src_0.0'}=&versiontrack($furi);
559: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
560: $hash{'ids_'.$furi}='0.0';
561: $hash{'is_map_0.0'}=1;
562: loadmap($uri);
563: if (defined($hash{'map_start_'.$uri})) {
564: &traceroute('0',$hash{'map_start_'.$uri},'&');
565: &accinit($uri,$short,$fn);
566: &hiddenurls();
567: }
568: # ------------------------------------------------------- Put versions into src
569: foreach (keys %hash) {
570: if ($_=~/^src\_/) {
571: $hash{$_}=&putinversion($hash{$_});
572: }
573: }
574: unless ((untie(%hash)) && (untie(%parmhash))) {
575: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
576: "Could not untie coursemap $fn for $uri.</font>");
577: }
578: {
579: my $cfh;
580: if ($cfh=Apache::File->new(">$fn.state")) {
581: print $cfh join("\n",@cond);
582: } else {
583: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
584: "Could not write statemap $fn for $uri.</font>");
585: }
586: }
587: } else {
588: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
589: "Could not tie coursemap $fn for $uri.</font>");
590: }
591: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
592: # ------------------------------------------------- Check for critical messages
593:
594: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
595: $ENV{'user.name'});
596: if ($what[0]) {
597: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
598: $retfurl='/adm/email?critical=display';
599: }
600: }
601: return ($retfurl,$errtext);
602: }
603:
604: # ------------------------------------------------------- Evaluate state string
605:
606: sub evalstate {
607:
608: my $fn=$ENV{'request.course.fn'}.'.state';
609: my $state='2';
610: if (-e $fn) {
611: my @conditions=();
612: {
613: my $fh=Apache::File->new($fn);
614: @conditions=<$fh>;
615: }
616: my $safeeval = new Safe;
617: my $safehole = new Safe::Hole;
618: $safeeval->permit("entereval");
619: $safeeval->permit(":base_math");
620: $safeeval->deny(":base_io");
621: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
622: foreach (@conditions) {
623: my $line=$_;
624: chomp($line);
625: my ($condition,$weight)=split(/\:/,$_);
626: if ($safeeval->reval($condition)) {
627: if ($weight eq 'force') {
628: $state.='3';
629: } else {
630: $state.='2';
631: }
632: } else {
633: if ($weight eq 'stop') {
634: $state.='0';
635: } else {
636: $state.='1';
637: }
638: }
639: }
640: }
641: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
642: return $state;
643: }
644:
645: 1;
646: __END__
647:
648: =head1 NAME
649:
650: Apache::lonuserstate - Construct and maintain state and binary representation
651: of course for user
652:
653: =head1 SYNOPSIS
654:
655: Invoked by lonroles.pm.
656:
657: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
658:
659: =head1 INTRODUCTION
660:
661: This module constructs and maintains state and binary representation
662: of course for user.
663:
664: This is part of the LearningOnline Network with CAPA project
665: described at http://www.lon-capa.org.
666:
667: =head1 HANDLER SUBROUTINE
668:
669: There is no handler subroutine.
670:
671: =head1 OTHER SUBROUTINES
672:
673: =over 4
674:
675: =item *
676:
677: loadmap() : Loads map from disk
678:
679: =item *
680:
681: simplify() : Simplify expression
682:
683: =item *
684:
685: traceroute() : Build condition hash
686:
687: =item *
688:
689: accinit() : Cascading conditions, quick access, parameters
690:
691: =item *
692:
693: readmap() : Read map and all submaps
694:
695: =item *
696:
697: evalstate() : Evaluate state string
698:
699: =back
700:
701: =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