File:
[LON-CAPA] /
rat /
lonuserstate.pm
Revision
1.76:
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Fri Apr 23 23:01:35 2004 UTC (20 years ago) by
albertel
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MAIN
CVS tags:
HEAD
- Somewhat amazed at how easy this was should with these changes
- uploaded .html/.page (all ssi type docs) now
- get parsed
- can be printed
- get default parameters
- are no longer wrapper ed
- .problems are still somewhat issue oriented though (need real metadata support for uploaded)
1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.76 2004/04/23 23:01:35 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: ###
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: $turi='/adm/wrapper'.$turi;
165: } elsif ($turi!~/\.(sequence|page)$/) {
166: $turi='/adm/coursedocs/showdoc'.$turi;
167: }
168: } elsif ($turi=~/\S/) { # normal non-empty internal resource
169: my $mapdir=$uri;
170: $mapdir=~s/[^\/]+$//;
171: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
172: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
173: $turi='/adm/wrapper'.$turi;
174: }
175: }
176: }
177: # Store reverse lookup, remove query string
178: my $idsuri=$turi;
179: $idsuri=~s/\?.+$//;
180: if (defined($hash{'ids_'.$idsuri})) {
181: $hash{'ids_'.$idsuri}.=','.$rid;
182: } else {
183: $hash{'ids_'.$idsuri}=''.$rid;
184: }
185:
186: if
187: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
188: $turi.='?register=1';
189: }
190:
191: $hash{'src_'.$rid}=$turi;
192:
193: if ($token->[2]->{'external'} eq 'true') {
194: $hash{'ext_'.$rid}='true:';
195: } else {
196: $hash{'ext_'.$rid}='false:';
197: }
198: if ($token->[2]->{'type'}) {
199: $hash{'type_'.$rid}=$token->[2]->{'type'};
200: if ($token->[2]->{'type'} eq 'start') {
201: $hash{'map_start_'.$uri}="$rid";
202: }
203: if ($token->[2]->{'type'} eq 'finish') {
204: $hash{'map_finish_'.$uri}="$rid";
205: }
206: } else {
207: $hash{'type_'.$rid}='normal';
208: }
209:
210: if (($turi=~/\.sequence$/) ||
211: ($turi=~/\.page$/)) {
212: $hash{'is_map_'.$rid}=1;
213: &loadmap($turi);
214: }
215:
216: } elsif ($token->[1] eq 'condition') {
217: # ------------------------------------------------------------------- Condition
218:
219: my $rid=$lpc.'.'.$token->[2]->{'id'};
220:
221: $hash{'kind_'.$rid}='cond';
222: $cond[$#cond+1]=$token->[2]->{'value'};
223: $hash{'condid_'.$rid}=$#cond;
224: if ($token->[2]->{'type'}) {
225: $cond[$#cond].=':'.$token->[2]->{'type'};
226: } else {
227: $cond[$#cond].=':normal';
228: }
229:
230: } elsif ($token->[1] eq 'link') {
231: # ----------------------------------------------------------------------- Links
232:
233: $linkpc++;
234: my $linkid=$lpc.'.'.$linkpc;
235:
236: my $goesto=$lpc.'.'.$token->[2]->{'to'};
237: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
238: my $undercond=0;
239:
240: if ($token->[2]->{'condition'}) {
241: $undercond=$lpc.'.'.$token->[2]->{'condition'};
242: }
243:
244: $hash{'goesto_'.$linkid}=$goesto;
245: $hash{'comesfrom_'.$linkid}=$comesfrom;
246: $hash{'undercond_'.$linkid}=$undercond;
247:
248: if (defined($hash{'to_'.$comesfrom})) {
249: $hash{'to_'.$comesfrom}.=','.$linkid;
250: } else {
251: $hash{'to_'.$comesfrom}=''.$linkid;
252: }
253: if (defined($hash{'from_'.$goesto})) {
254: $hash{'from_'.$goesto}.=','.$linkid;
255: } else {
256: $hash{'from_'.$goesto}=''.$linkid;
257: }
258: } elsif ($token->[1] eq 'param') {
259: # ------------------------------------------------------------------- Parameter
260:
261: my $referid=$lpc.'.'.$token->[2]->{'to'};
262: my $name=$token->[2]->{'name'};
263: my $part;
264: if ($name=~/^parameter_(.*)_/) {
265: $part=$1;
266: } else {
267: $part=0;
268: }
269: $name=~s/^.*_([^_]*)$/$1/;
270: my $newparam=
271: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
272: &Apache::lonnet::escape($part.'.'.$name).'='.
273: &Apache::lonnet::escape($token->[2]->{'value'});
274: if (defined($hash{'param_'.$referid})) {
275: $hash{'param_'.$referid}.='&'.$newparam;
276: } else {
277: $hash{'param_'.$referid}=''.$newparam;
278: }
279: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
280: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
281: }
282: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
283: $randompick{$referid}=$token->[2]->{'value'};
284: }
285: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
286: $randompick{$referid}=$token->[2]->{'value'};
287: }
288: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
289: if ($token->[2]->{'value'}=~/^yes$/i) {
290: $encurl{$referid}=1;
291: }
292: }
293: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
294: if ($token->[2]->{'value'}=~/^yes$/i) {
295: $hiddenurl{$referid}=1;
296: }
297: }
298: }
299:
300: }
301: }
302:
303: } else {
304: $errtext.='Map not loaded: The file does not exist. ';
305: }
306: }
307:
308: # --------------------------------------------------------- Simplify expression
309:
310: sub simplify {
311: my $expression=shift;
312: # (8)=8
313: $expression=~s/\((\d+)\)/$1/g;
314: # 8&8=8
315: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
316: # 8|8=8
317: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
318: # (5&3)&4=5&3&4
319: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
320: # (((5&3)|(4&6)))=((5&3)|(4&6))
321: $expression=~
322: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
323: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
324: $expression=~
325: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
326: return $expression;
327: }
328:
329: # -------------------------------------------------------- Build condition hash
330:
331: sub traceroute {
332: my ($sofar,$rid,$beenhere)=@_;
333: $sofar=simplify($sofar);
334: unless ($beenhere=~/\&$rid\&/) {
335: $beenhere.=$rid.'&';
336: if (($retfurl eq '') && ($hash{'src_'.$rid})
337: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
338: my ($mapid,$resid)=split(/\./,$rid);
339: $retfurl=$hash{'src_'.$rid}.
340: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
341: &Apache::lonnet::symbclean(
342: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
343: '___'.$resid.'___'.
344: &Apache::lonnet::declutter($hash{'src_'.$rid}));
345: }
346: if (defined($hash{'conditions_'.$rid})) {
347: $hash{'conditions_'.$rid}=simplify(
348: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
349: } else {
350: $hash{'conditions_'.$rid}=$sofar;
351: }
352: if (defined($hash{'is_map_'.$rid})) {
353: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
354: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
355: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
356: $sofar=
357: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
358: }
359: }
360: }
361: if (defined($hash{'to_'.$rid})) {
362: foreach (split(/\,/,$hash{'to_'.$rid})) {
363: my $further=$sofar;
364: if ($hash{'undercond_'.$_}) {
365: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
366: $further=simplify('('.$further.')&('.
367: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
368: } else {
369: $errtext.='Undefined condition ID: '
370: .$hash{'undercond_'.$_}.'. ';
371: }
372: }
373: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
374: }
375: }
376: }
377: }
378:
379: # ------------------------------ Cascading conditions, quick access, parameters
380:
381: sub accinit {
382: my ($uri,$short,$fn)=@_;
383: my %acchash=();
384: my %captured=();
385: my $condcounter=0;
386: $acchash{'acc.cond.'.$short.'.0'}=0;
387: foreach (keys %hash) {
388: if ($_=~/^conditions/) {
389: my $expr=$hash{$_};
390: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
391: my $sub=$_;
392: my $orig=$_;
393: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
394: my $factor=$1;
395: $sub=~s/$factor//g;
396: $sub=~s/^\(/\($factor\(/;
397: $sub.=')';
398: $sub=simplify($sub);
399: $orig=~s/(\W)/\\$1/g;
400: $expr=~s/$orig/$sub/;
401: }
402: $hash{$_}=$expr;
403: unless (defined($captured{$expr})) {
404: $condcounter++;
405: $captured{$expr}=$condcounter;
406: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
407: }
408: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
409: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
410: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
411: foreach (split(/\&/,$hash{$_})) {
412: my ($typename,$value)=split(/\=/,$_);
413: my ($type,$name)=split(/\:/,$typename);
414: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
415: &Apache::lonnet::unescape($value);
416: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
417: &Apache::lonnet::unescape($type);
418: }
419: }
420: }
421: foreach (keys %hash) {
422: if ($_=~/^ids/) {
423: foreach (split(/\,/,$hash{$_})) {
424: my $resid=$_;
425: my $uri=$hash{'src_'.$resid};
426: $uri=~s/^\/adm\/wrapper//;
427: $uri=&Apache::lonnet::declutter($uri);
428: my @uriparts=split(/\//,$uri);
429: my $urifile=$uriparts[$#uriparts];
430: $#uriparts--;
431: my $uripath=join('/',@uriparts);
432: if ($uripath) {
433: my $uricond='0';
434: if (defined($hash{'conditions_'.$resid})) {
435: $uricond=$captured{$hash{'conditions_'.$resid}};
436: }
437: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
438: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
439: /(\&\Q$urifile\E\:[^\&]*)/) {
440: my $replace=$1;
441: my $regexp=$replace;
442: $regexp=~s/\|/\\\|/g;
443: $acchash{'acc.res.'.$short.'.'.$uripath}
444: =~s/$regexp/$replace\|$uricond/;
445: } else {
446: $acchash{'acc.res.'.$short.'.'.$uripath}.=
447: $urifile.':'.$uricond.'&';
448: }
449: } else {
450: $acchash{'acc.res.'.$short.'.'.$uripath}=
451: '&'.$urifile.':'.$uricond.'&';
452: }
453: }
454: }
455: }
456: }
457: $acchash{'acc.res.'.$short.'.'}='&:0&';
458: my $courseuri=$uri;
459: $courseuri=~s/^\/res\///;
460: &Apache::lonnet::delenv('(acc\.|httpref\.)');
461: &Apache::lonnet::appenv(%acchash,
462: "request.course.id" => $short,
463: "request.course.fn" => $fn,
464: "request.course.uri" => $courseuri);
465: }
466:
467: # ---------------- Selectively delete from randompick maps and hidden url parms
468:
469: sub hiddenurls {
470: my $randomoutentry='';
471: foreach my $rid (keys %randompick) {
472: my $rndpick=$randompick{$rid};
473: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
474: # ------------------------------------------- put existing resources into array
475: my @currentrids=();
476: foreach (sort(keys(%hash))) {
477: if ($_=~/^src_($mpc\.\d+)/) {
478: if ($hash{'src_'.$1}) { push @currentrids, $1; }
479: }
480: }
481: # rids are number.number and we want to numercially sort on
482: # the second number
483: @currentrids=sort {
484: my (undef,$aid)=split(/\./,$a);
485: my (undef,$bid)=split(/\./,$b);
486: $aid <=> $bid;
487: } @currentrids;
488: next if ($#currentrids<$rndpick);
489: # -------------------------------- randomly eliminate the ones that should stay
490: my (undef,$id)=split(/\./,$rid);
491: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
492: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
493: &Apache::lonnet::setup_random_from_rndseed($rndseed);
494: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
495: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
496: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
497: # -------------------------------------------------------- delete the leftovers
498: for (my $k=0; $k<=$#currentrids; $k++) {
499: if ($currentrids[$k]) {
500: $hash{'randomout_'.$currentrids[$k]}=1;
501: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
502: $randomoutentry.='&'.
503: &Apache::lonnet::symbclean(
504: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
505: '___'.$resid.'___'.
506: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
507: ).'&';
508: }
509: }
510: }
511: # ------------------------------ take care of explicitly hidden urls or folders
512: foreach my $rid (keys %hiddenurl) {
513: $hash{'randomout_'.$rid}=1;
514: my ($mapid,$resid)=split(/\./,$rid);
515: $randomoutentry.='&'.
516: &Apache::lonnet::symbclean(
517: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
518: '___'.$resid.'___'.
519: &Apache::lonnet::declutter($hash{'src_'.$rid})
520: ).'&';
521: }
522: # --------------------------------------- append randomout entry to environment
523: if ($randomoutentry) {
524: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
525: }
526: }
527:
528: # ---------------------------------------------------- Read map and all submaps
529:
530: sub readmap {
531: my $short=shift;
532: $short=~s/^\///;
533: my %cenv=&Apache::lonnet::coursedescription($short);
534: my $fn=$cenv{'fn'};
535: my $uri;
536: $short=~s/\//\_/g;
537: unless ($uri=$cenv{'url'}) {
538: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
539: "Could not load course $short.</font>");
540: return 'No course data available.';
541: }
542: @cond=('true:normal');
543: unlink($fn.'.db');
544: unlink($fn.'_symb.db');
545: unlink($fn.'.state');
546: unlink($fn.'parms.db');
547: undef %randompick;
548: undef %hiddenurl;
549: undef %encurl;
550: $retfurl='';
551: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
552: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
553: %hash=();
554: %parmhash=();
555: $errtext='';
556: $pc=0;
557: &processversionfile(%cenv);
558: my $furi=&Apache::lonnet::clutter($uri);
559: $hash{'src_0.0'}=&versiontrack($furi);
560: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
561: $hash{'ids_'.$furi}='0.0';
562: $hash{'is_map_0.0'}=1;
563: loadmap($uri);
564: if (defined($hash{'map_start_'.$uri})) {
565: &traceroute('0',$hash{'map_start_'.$uri},'&');
566: &accinit($uri,$short,$fn);
567: &hiddenurls();
568: }
569: # ------------------------------------------------------- Put versions into src
570: foreach (keys %hash) {
571: if ($_=~/^src\_/) {
572: $hash{$_}=&putinversion($hash{$_});
573: }
574: }
575: # ---------------------------------------------------------------- Encrypt URLs
576: foreach (keys %encurl) {
577: $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
578: }
579: # ----------------------------------------------- Close hashes to finally store
580: # --------------------------------- Routine must pass this point, no early outs
581: unless ((untie(%hash)) && (untie(%parmhash))) {
582: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
583: "Could not untie coursemap $fn for $uri.</font>");
584: }
585: # ---------------------------------------------------- Store away initial state
586: {
587: my $cfh;
588: if ($cfh=Apache::File->new(">$fn.state")) {
589: print $cfh join("\n",@cond);
590: } else {
591: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
592: "Could not write statemap $fn for $uri.</font>");
593: }
594: }
595: } else {
596: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
597: "Could not tie coursemap $fn for $uri.</font>");
598: }
599: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
600: # ------------------------------------------------- Check for critical messages
601:
602: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
603: $ENV{'user.name'});
604: if ($what[0]) {
605: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
606: $retfurl='/adm/email?critical=display';
607: }
608: }
609: return ($retfurl,$errtext);
610: }
611:
612: # ------------------------------------------------------- Evaluate state string
613:
614: sub evalstate {
615:
616: my $fn=$ENV{'request.course.fn'}.'.state';
617: my $state='2';
618: if (-e $fn) {
619: my @conditions=();
620: {
621: my $fh=Apache::File->new($fn);
622: @conditions=<$fh>;
623: }
624: my $safeeval = new Safe;
625: my $safehole = new Safe::Hole;
626: $safeeval->permit("entereval");
627: $safeeval->permit(":base_math");
628: $safeeval->deny(":base_io");
629: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
630: foreach (@conditions) {
631: my $line=$_;
632: chomp($line);
633: my ($condition,$weight)=split(/\:/,$_);
634: if ($safeeval->reval($condition)) {
635: if ($weight eq 'force') {
636: $state.='3';
637: } else {
638: $state.='2';
639: }
640: } else {
641: if ($weight eq 'stop') {
642: $state.='0';
643: } else {
644: $state.='1';
645: }
646: }
647: }
648: }
649: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
650: return $state;
651: }
652:
653: 1;
654: __END__
655:
656: =head1 NAME
657:
658: Apache::lonuserstate - Construct and maintain state and binary representation
659: of course for user
660:
661: =head1 SYNOPSIS
662:
663: Invoked by lonroles.pm.
664:
665: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
666:
667: =head1 INTRODUCTION
668:
669: This module constructs and maintains state and binary representation
670: of course for user.
671:
672: This is part of the LearningOnline Network with CAPA project
673: described at http://www.lon-capa.org.
674:
675: =head1 HANDLER SUBROUTINE
676:
677: There is no handler subroutine.
678:
679: =head1 OTHER SUBROUTINES
680:
681: =over 4
682:
683: =item *
684:
685: loadmap() : Loads map from disk
686:
687: =item *
688:
689: simplify() : Simplify expression
690:
691: =item *
692:
693: traceroute() : Build condition hash
694:
695: =item *
696:
697: accinit() : Cascading conditions, quick access, parameters
698:
699: =item *
700:
701: readmap() : Read map and all submaps
702:
703: =item *
704:
705: evalstate() : Evaluate state string
706:
707: =back
708:
709: =cut
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