1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.26 2001/12/17 00:57:59 harris41 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: # 12/16 Scott Harrison
44: #
45: ###
46:
47: package Apache::lonuserstate;
48:
49: # ------------------------------------------------- modules used by this module
50: use strict;
51: use Apache::Constants qw(:common :http);
52: use Apache::File;
53: use HTML::TokeParser;
54: use Apache::lonnet();
55: use Apache::loncommon();
56: use GDBM_File;
57: use Apache::lonmsg;
58: use Safe;
59: use Safe::Hole;
60: use Opcode;
61:
62: # ---------------------------------------------------- Globals for this package
63:
64: my $pc; # Package counter
65: my %hash; # The big tied hash
66: my %parmhash;# The hash with the parameters
67: my @cond; # Array with all of the conditions
68: my $errtext; # variable with all errors
69: my $retfurl; # variable with the very first URL in the course
70:
71: # --------------------------------------------------------- Loads map from disk
72:
73: sub loadmap {
74: my $uri=shift;
75: if ($hash{'map_pc_'.$uri}) { return OK; }
76:
77: $pc++;
78: my $lpc=$pc;
79: $hash{'map_pc_'.$uri}=$lpc;
80: $hash{'map_id_'.$lpc}=$uri;
81:
82: my $fn='/home/httpd/html'.$uri;
83:
84: unless (($fn=~/\.sequence$/) ||
85: ($fn=~/\.page$/)) {
86: $errtext.="Invalid map: $fn\n";
87: return OK;
88: }
89:
90: my $ispage=($fn=~/\.page$/);
91:
92: unless (-e $fn) {
93: my $returned=Apache::lonnet::repcopy($fn);
94: unless ($returned eq OK) {
95: $errtext.="Could not import: $fn - ";
96: if ($returned eq HTTP_SERVICE_UNAVAILABLE) {
97: $errtext.="Server unavailable\n";
98: }
99: if ($returned eq HTTP_NOT_FOUND) {
100: $errtext.="File not found\n";
101: }
102: if ($returned eq FORBIDDEN) {
103: $errtext.="Access forbidden\n";
104: }
105: return OK;
106: }
107: }
108:
109: if (-e $fn) {
110: my @content;
111: {
112: my $fh=Apache::File->new($fn);
113: @content=<$fh>;
114: }
115: my $instr=join('',@content);
116: my $parser = HTML::TokeParser->new(\$instr);
117: my $token;
118:
119: my $linkpc=0;
120:
121: $fn=~/\.(\w+)$/;
122:
123: $hash{'map_type_'.$lpc}=$1;
124:
125: while ($token = $parser->get_token) {
126: if ($token->[0] eq 'S') {
127: if ($token->[1] eq 'resource') {
128: # -------------------------------------------------------------------- Resource
129:
130: my $rid=$lpc.'.'.$token->[2]->{'id'};
131:
132: $hash{'kind_'.$rid}='res';
133: $hash{'title_'.$rid}=$token->[2]->{'title'};
134: my $turi=$token->[2]->{'src'};
135: unless ($ispage) {
136: $turi=~/\.(\w+)$/;
137: my $embstyle=&Apache::loncommon::fileembstyle($1);
138: if ($token->[2]->{'external'} eq 'true') {
139: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
140: } else {
141: my $embstyle=&Apache::loncommon::fileembstyle($1);
142: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
143: $turi='/adm/wrapper'.$turi;
144: }
145: }
146: }
147: $hash{'src_'.$rid}=$turi;
148:
149: if (defined($hash{'ids_'.$turi})) {
150: $hash{'ids_'.$turi}.=','.$rid;
151: } else {
152: $hash{'ids_'.$turi}=''.$rid;
153: }
154:
155: if ($token->[2]->{'external'} eq 'true') {
156: $hash{'ext_'.$rid}='true:';
157: } else {
158: $hash{'ext_'.$rid}='false:';
159: }
160: if ($token->[2]->{'type'}) {
161: $hash{'type_'.$rid}=$token->[2]->{'type'};
162: if ($token->[2]->{'type'} eq 'start') {
163: $hash{'map_start_'.$uri}="$rid";
164: }
165: if ($token->[2]->{'type'} eq 'finish') {
166: $hash{'map_finish_'.$uri}="$rid";
167: }
168: } else {
169: $hash{'type_'.$rid}='normal';
170: }
171:
172: if (($turi=~/\.sequence$/) ||
173: ($turi=~/\.page$/)) {
174: $hash{'is_map_'.$rid}=1;
175: &loadmap($turi);
176: }
177:
178: } elsif ($token->[1] eq 'condition') {
179: # ------------------------------------------------------------------- Condition
180:
181: my $rid=$lpc.'.'.$token->[2]->{'id'};
182:
183: $hash{'kind_'.$rid}='cond';
184: $cond[$#cond+1]=$token->[2]->{'value'};
185: $hash{'condid_'.$rid}=$#cond;
186: if ($token->[2]->{'type'}) {
187: $cond[$#cond].=':'.$token->[2]->{'type'};
188: } else {
189: $cond[$#cond].=':normal';
190: }
191:
192: } elsif ($token->[1] eq 'link') {
193: # ----------------------------------------------------------------------- Links
194:
195: $linkpc++;
196: my $linkid=$lpc.'.'.$linkpc;
197:
198: my $goesto=$lpc.'.'.$token->[2]->{'to'};
199: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
200: my $undercond=0;
201:
202: if ($token->[2]->{'condition'}) {
203: $undercond=$lpc.'.'.$token->[2]->{'condition'};
204: }
205:
206: $hash{'goesto_'.$linkid}=$goesto;
207: $hash{'comesfrom_'.$linkid}=$comesfrom;
208: $hash{'undercond_'.$linkid}=$undercond;
209:
210: if (defined($hash{'to_'.$comesfrom})) {
211: $hash{'to_'.$comesfrom}.=','.$linkid;
212: } else {
213: $hash{'to_'.$comesfrom}=''.$linkid;
214: }
215: if (defined($hash{'from_'.$goesto})) {
216: $hash{'from_'.$goesto}.=','.$linkid;
217: } else {
218: $hash{'from_'.$goesto}=''.$linkid;
219: }
220: } elsif ($token->[1] eq 'param') {
221: # ------------------------------------------------------------------- Parameter
222:
223: my $referid=$lpc.'.'.$token->[2]->{'to'};
224: my $part=$token->[2]->{'part'};
225: unless ($part) { $part=0; }
226: my $newparam=
227: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
228: &Apache::lonnet::escape($part.'.'.
229: $token->[2]->{'name'}).'='.
230: &Apache::lonnet::escape($token->[2]->{'value'});
231: if (defined($hash{'param_'.$referid})) {
232: $hash{'param_'.$referid}.='&'.$newparam;
233: } else {
234: $hash{'param_'.$referid}=''.$newparam;
235: }
236:
237: }
238:
239: }
240: }
241:
242: } else {
243: $errtext.='Map not loaded: The file does not exist. ';
244: }
245: }
246:
247: # --------------------------------------------------------- Simplify expression
248:
249: sub simplify {
250: my $expression=shift;
251: # (8)=8
252: $expression=~s/\((\d+)\)/$1/g;
253: # 8&8=8
254: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
255: # 8|8=8
256: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
257: # (5&3)&4=5&3&4
258: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
259: # (((5&3)|(4&6)))=((5&3)|(4&6))
260: $expression=~
261: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
262: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
263: $expression=~
264: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
265: return $expression;
266: }
267:
268: # -------------------------------------------------------- Build condition hash
269:
270: sub traceroute {
271: my ($sofar,$rid,$beenhere)=@_;
272: $sofar=simplify($sofar);
273: unless ($beenhere=~/\&$rid\&/) {
274: $beenhere.=$rid.'&';
275: if ($retfurl eq '') {
276: $retfurl=$hash{'src_'.$rid};
277: }
278: if (defined($hash{'conditions_'.$rid})) {
279: $hash{'conditions_'.$rid}=simplify(
280: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
281: } else {
282: $hash{'conditions_'.$rid}=$sofar;
283: }
284: if (defined($hash{'is_map_'.$rid})) {
285: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
286: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
287: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
288: $sofar=
289: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
290: }
291: }
292: }
293: if (defined($hash{'to_'.$rid})) {
294: foreach (split(/\,/,$hash{'to_'.$rid})) {
295: my $further=$sofar;
296: if ($hash{'undercond_'.$_}) {
297: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
298: $further=simplify('('.$further.')&('.
299: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
300: } else {
301: $errtext.='Undefined condition ID: '
302: .$hash{'undercond_'.$_}.'. ';
303: }
304: }
305: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
306: }
307: }
308: }
309: }
310:
311: # ------------------------------ Cascading conditions, quick access, parameters
312:
313: sub accinit {
314: my ($uri,$short,$fn)=@_;
315: my %acchash=();
316: my %captured=();
317: my $condcounter=0;
318: $acchash{'acc.cond.'.$short.'.0'}=0;
319: foreach (keys %hash) {
320: if ($_=~/^conditions/) {
321: my $expr=$hash{$_};
322: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
323: my $sub=$_;
324: my $orig=$_;
325: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
326: my $factor=$1;
327: $sub=~s/$factor//g;
328: $sub=~s/^\(/\($factor\(/;
329: $sub.=')';
330: $sub=simplify($sub);
331: $orig=~s/(\W)/\\$1/g;
332: $expr=~s/$orig/$sub/;
333: }
334: $hash{$_}=$expr;
335: unless (defined($captured{$expr})) {
336: $condcounter++;
337: $captured{$expr}=$condcounter;
338: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
339: }
340: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
341: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
342: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
343: foreach (split(/\&/,$hash{$_})) {
344: my ($typename,$value)=split(/\=/,$_);
345: my ($type,$name)=split(/\:/,$typename);
346: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
347: &Apache::lonnet::unescape($value);
348: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
349: &Apache::lonnet::unescape($type);
350: }
351: }
352: }
353: foreach (keys %hash) {
354: if ($_=~/^ids/) {
355: foreach (split(/\,/,$hash{$_})) {
356: my $resid=$_;
357: my $uri=$hash{'src_'.$resid};
358: $uri=~s/^\/adm\/wrapper//;
359: my @uriparts=split(/\//,$uri);
360: my $urifile=$uriparts[$#uriparts];
361: $#uriparts--;
362: my $uripath=join('/',@uriparts);
363: $uripath=~s/^\/res\///;
364: if ($uripath) {
365: my $uricond='0';
366: if (defined($hash{'conditions_'.$resid})) {
367: $uricond=$captured{$hash{'conditions_'.$resid}};
368: }
369: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
370: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
371: /(\&$urifile\:[^\&]*)/) {
372: my $replace=$1;
373: $acchash{'acc.res.'.$short.'.'.$uripath}
374: =~s/$replace/$replace\|$uricond/;
375: } else {
376: $acchash{'acc.res.'.$short.'.'.$uripath}.=
377: $urifile.':'.$uricond.'&';
378: }
379: } else {
380: $acchash{'acc.res.'.$short.'.'.$uripath}=
381: '&'.$urifile.':'.$uricond.'&';
382: }
383: }
384: }
385: }
386: }
387: $acchash{'acc.res.'.$short.'.'}='&:0&';
388: my $courseuri=$uri;
389: $courseuri=~s/^\/res\///;
390: &Apache::lonnet::delenv('(acc\.|httpref\.)');
391: &Apache::lonnet::appenv(%acchash,
392: "request.course.id" => $short,
393: "request.course.fn" => $fn,
394: "request.course.uri" => $courseuri);
395: }
396:
397: # ---------------------------------------------------- Read map and all submaps
398:
399: sub readmap {
400: my $short=shift;
401: $short=~s/^\///;
402: my %cenv=&Apache::lonnet::coursedescription($short);
403: my $fn=$cenv{'fn'};
404: my $uri;
405: $short=~s/\//\_/g;
406: unless ($uri=$cenv{'url'}) {
407: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
408: "Could not load course $short.</font>");
409: return 'No course data available.';
410: }
411: @cond=('true:normal');
412: unlink($fn.'.db');
413: unlink($fn.'_symb.db');
414: unlink($fn.'.state');
415: unlink($fn.'parms.db');
416: $retfurl='';
417: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) &&
418: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT,0640))) {
419: %hash=();
420: %parmhash=();
421: $errtext='';
422: $pc=0;
423: loadmap($uri);
424: if (defined($hash{'map_start_'.$uri})) {
425: &traceroute('0',$hash{'map_start_'.$uri},'&');
426: &accinit($uri,$short,$fn);
427: }
428: unless ((untie(%hash)) && (untie(%parmhash))) {
429: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
430: "Could not untie coursemap $fn for $uri.</font>");
431: }
432: {
433: my $cfh;
434: if ($cfh=Apache::File->new(">$fn.state")) {
435: print $cfh join("\n",@cond);
436: } else {
437: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
438: "Could not write statemap $fn for $uri.</font>");
439: }
440: }
441: } else {
442: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
443: "Could not tie coursemap $fn for $uri.</font>");
444: }
445: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
446: return ($retfurl,$errtext);
447: }
448:
449: # ------------------------------------------------------- Evaluate state string
450:
451: sub evalstate {
452:
453: my $fn=$ENV{'request.course.fn'}.'.state';
454: my $state='2';
455: if (-e $fn) {
456: my @conditions=();
457: {
458: my $fh=Apache::File->new($fn);
459: @conditions=<$fh>;
460: }
461: my $safeeval = new Safe;
462: my $safehole = new Safe::Hole;
463: $safeeval->permit("entereval");
464: $safeeval->permit(":base_math");
465: $safeeval->deny(":base_io");
466: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
467: foreach (@conditions) {
468: my $line=$_;
469: chomp($line);
470: my ($condition,$weight)=split(/\:/,$_);
471: if ($safeeval->reval($condition)) {
472: if ($weight eq 'force') {
473: $state.='3';
474: } else {
475: $state.='2';
476: }
477: } else {
478: if ($weight eq 'stop') {
479: $state.='0';
480: } else {
481: $state.='1';
482: }
483: }
484: }
485: }
486: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
487: return $state;
488: }
489:
490: 1;
491: __END__
492:
493: =head1 NAME
494:
495: Apache::lonuserstate - Construct and maintain state and binary representation
496: of course for user
497:
498: =head1 SYNOPSIS
499:
500: Invoked by lonroles.pm.
501:
502: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
503:
504: =head1 INTRODUCTION
505:
506: This module constructs and maintains state and binary representation
507: of course for user.
508:
509: This is part of the LearningOnline Network with CAPA project
510: described at http://www.lon-capa.org.
511:
512: =head1 HANDLER SUBROUTINE
513:
514: There is no handler subroutine.
515:
516: =head1 OTHER SUBROUTINES
517:
518: =over 4
519:
520: =item *
521:
522: loadmap() : Loads map from disk
523:
524: =item *
525:
526: simplify() : Simplify expression
527:
528: =item *
529:
530: traceroute() : Build condition hash
531:
532: =item *
533:
534: accinit() : Cascading conditions, quick access, parameters
535:
536: =item *
537:
538: readmap() : Read map and all submaps
539:
540: =item *
541:
542: evalstate() : Evaluate state string
543:
544: =back
545:
546: =cut
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