Annotation of rat/lonuserstate.pm, revision 1.24
1.1 www 1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # (Server for RAT Maps
5: #
6: # (Edit Handler for RAT Maps
7: # (TeX Content Handler
8: #
9: # 05/29/00,05/30 Gerd Kortemeyer)
10: # 7/1 Gerd Kortemeyer)
11: # 7/1,7/3,7/4,7/7,7/8,7/10 Gerd Kortemeyer)
12: #
1.9 www 13: # 7/15,7/17,7/18,8/1,8/2,8/4,8/5,8/21,8/22,8/23,8/30,
1.19 www 14: # 9/2,9/4,9/29,9/30,10/2,10/11,10/30,10/31,
1.22 www 15: # 11/1,11/2,11/14,11/16,11/22,12/28,
1.24 ! www 16: # 07/05/01,08/30,08/31 Gerd Kortemeyer
1.1 www 17:
18: package Apache::lonuserstate;
19:
20: use strict;
21: use Apache::Constants qw(:common :http);
22: use Apache::File;
23: use HTML::TokeParser;
24: use Apache::lonnet();
25: use GDBM_File;
1.12 www 26: use Apache::lonmsg;
1.15 www 27: use Safe;
1.21 www 28: use Safe::Hole;
1.15 www 29: use Opcode;
30:
1.1 www 31: # ---------------------------------------------------- Globals for this package
32:
33: my $pc; # Package counter
34: my %hash; # The big tied hash
1.19 www 35: my %parmhash;# The hash with the parameters
1.1 www 36: my @cond; # Array with all of the conditions
37: my $errtext; # variable with all errors
1.21 www 38: my $retfurl; # variable with the very first URL in the course
1.1 www 39:
40: # --------------------------------------------------------- Loads map from disk
41:
42: sub loadmap {
43: my $uri=shift;
44: if ($hash{'map_pc_'.$uri}) { return OK; }
45:
46: $pc++;
47: my $lpc=$pc;
48: $hash{'map_pc_'.$uri}=$lpc;
49: $hash{'map_id_'.$lpc}=$uri;
50:
51: my $fn='/home/httpd/html'.$uri;
52:
1.10 www 53: unless (($fn=~/\.sequence$/) ||
1.1 www 54: ($fn=~/\.page$/)) {
55: $errtext.="Invalid map: $fn\n";
56: return OK;
57: }
58:
1.22 www 59: my $ispage=($fn=~/\.page$/);
60:
1.1 www 61: unless (-e $fn) {
62: my $returned=Apache::lonnet::repcopy($fn);
63: unless ($returned eq OK) {
64: $errtext.="Could not import: $fn - ";
65: if ($returned eq HTTP_SERVICE_UNAVAILABLE) {
66: $errtext.="Server unavailable\n";
67: }
68: if ($returned eq HTTP_NOT_FOUND) {
69: $errtext.="File not found\n";
70: }
71: if ($returned eq FORBIDDEN) {
72: $errtext.="Access forbidden\n";
73: }
74: return OK;
75: }
76: }
77:
78: if (-e $fn) {
79: my @content;
80: {
81: my $fh=Apache::File->new($fn);
82: @content=<$fh>;
83: }
84: my $instr=join('',@content);
85: my $parser = HTML::TokeParser->new(\$instr);
86: my $token;
87:
88: my $linkpc=0;
89:
90: $fn=~/\.(\w+)$/;
91:
92: $hash{'map_type_'.$lpc}=$1;
93:
94: while ($token = $parser->get_token) {
95: if ($token->[0] eq 'S') {
96: if ($token->[1] eq 'resource') {
97: # -------------------------------------------------------------------- Resource
98:
99: my $rid=$lpc.'.'.$token->[2]->{'id'};
100:
101: $hash{'kind_'.$rid}='res';
102: $hash{'title_'.$rid}=$token->[2]->{'title'};
103: my $turi=$token->[2]->{'src'};
1.22 www 104: unless ($ispage) {
105: $turi=~/\.(\w+)$/;
106: my $embstyle=&Apache::lonnet::fileembstyle($1);
107: if ($token->[2]->{'external'} eq 'true') {
108: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
109: } else {
110: my $embstyle=&Apache::lonnet::fileembstyle($1);
111: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
112: $turi='/adm/wrapper'.$turi;
113: }
114: }
115: }
1.1 www 116: $hash{'src_'.$rid}=$turi;
117:
118: if (defined($hash{'ids_'.$turi})) {
119: $hash{'ids_'.$turi}.=','.$rid;
120: } else {
121: $hash{'ids_'.$turi}=''.$rid;
122: }
123:
1.22 www 124: if ($token->[2]->{'external'} eq 'true') {
1.1 www 125: $hash{'ext_'.$rid}='true:';
126: } else {
127: $hash{'ext_'.$rid}='false:';
128: }
129: if ($token->[2]->{'type'}) {
130: $hash{'type_'.$rid}=$token->[2]->{'type'};
1.2 www 131: if ($token->[2]->{'type'} eq 'start') {
132: $hash{'map_start_'.$uri}="$rid";
133: }
134: if ($token->[2]->{'type'} eq 'finish') {
135: $hash{'map_finish_'.$uri}="$rid";
136: }
1.1 www 137: } else {
138: $hash{'type_'.$rid}='normal';
139: }
140:
1.10 www 141: if (($turi=~/\.sequence$/) ||
1.1 www 142: ($turi=~/\.page$/)) {
1.2 www 143: $hash{'is_map_'.$rid}=1;
1.1 www 144: &loadmap($turi);
145: }
146:
147: } elsif ($token->[1] eq 'condition') {
148: # ------------------------------------------------------------------- Condition
149:
150: my $rid=$lpc.'.'.$token->[2]->{'id'};
151:
152: $hash{'kind_'.$rid}='cond';
1.2 www 153: $cond[$#cond+1]=$token->[2]->{'value'};
154: $hash{'condid_'.$rid}=$#cond;
1.1 www 155: if ($token->[2]->{'type'}) {
1.2 www 156: $cond[$#cond].=':'.$token->[2]->{'type'};
1.1 www 157: } else {
1.2 www 158: $cond[$#cond].=':normal';
1.1 www 159: }
160:
161: } elsif ($token->[1] eq 'link') {
162: # ----------------------------------------------------------------------- Links
163:
164: $linkpc++;
165: my $linkid=$lpc.'.'.$linkpc;
166:
167: my $goesto=$lpc.'.'.$token->[2]->{'to'};
168: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
169: my $undercond=0;
170:
171: if ($token->[2]->{'condition'}) {
172: $undercond=$lpc.'.'.$token->[2]->{'condition'};
173: }
174:
175: $hash{'goesto_'.$linkid}=$goesto;
176: $hash{'comesfrom_'.$linkid}=$comesfrom;
177: $hash{'undercond_'.$linkid}=$undercond;
178:
179: if (defined($hash{'to_'.$comesfrom})) {
180: $hash{'to_'.$comesfrom}.=','.$linkid;
181: } else {
182: $hash{'to_'.$comesfrom}=''.$linkid;
183: }
184: if (defined($hash{'from_'.$goesto})) {
185: $hash{'from_'.$goesto}.=','.$linkid;
186: } else {
187: $hash{'from_'.$goesto}=''.$linkid;
188: }
1.18 www 189: } elsif ($token->[1] eq 'param') {
190: # ------------------------------------------------------------------- Parameter
191:
192: my $referid=$lpc.'.'.$token->[2]->{'to'};
1.20 www 193: my $part=$token->[2]->{'part'};
194: unless ($part) { $part=0; }
1.18 www 195: my $newparam=
196: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
1.20 www 197: &Apache::lonnet::escape($part.'.'.
198: $token->[2]->{'name'}).'='.
1.18 www 199: &Apache::lonnet::escape($token->[2]->{'value'});
200: if (defined($hash{'param_'.$referid})) {
201: $hash{'param_'.$referid}.='&'.$newparam;
202: } else {
203: $hash{'param_'.$referid}=''.$newparam;
204: }
205:
1.1 www 206: }
207:
208: }
209: }
210:
211: } else {
212: $errtext.='Map not loaded: The file does not exist. ';
213: }
214: }
215:
1.3 www 216: # --------------------------------------------------------- Simplify expression
217:
218: sub simplify {
219: my $expression=shift;
220: # (8)=8
221: $expression=~s/\((\d+)\)/$1/g;
222: # 8&8=8
1.7 www 223: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
1.3 www 224: # 8|8=8
1.7 www 225: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
1.3 www 226: # (5&3)&4=5&3&4
1.7 www 227: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
1.3 www 228: # (((5&3)|(4&6)))=((5&3)|(4&6))
229: $expression=~
230: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
231: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
232: $expression=~
233: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
234: return $expression;
235: }
236:
1.2 www 237: # -------------------------------------------------------- Build condition hash
238:
239: sub traceroute {
1.3 www 240: my ($sofar,$rid,$beenhere)=@_;
241: $sofar=simplify($sofar);
1.2 www 242: unless ($beenhere=~/\&$rid\&/) {
243: $beenhere.=$rid.'&';
1.21 www 244: if ($retfurl eq '') {
245: $retfurl=$hash{'src_'.$rid};
246: }
1.2 www 247: if (defined($hash{'conditions_'.$rid})) {
1.3 www 248: $hash{'conditions_'.$rid}=simplify(
249: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
1.2 www 250: } else {
251: $hash{'conditions_'.$rid}=$sofar;
252: }
253: if (defined($hash{'is_map_'.$rid})) {
1.3 www 254: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
255: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
256: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
257: $sofar=
258: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
259: }
1.2 www 260: }
261: }
262: if (defined($hash{'to_'.$rid})) {
263: map {
264: my $further=$sofar;
265: if ($hash{'undercond_'.$_}) {
266: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
1.3 www 267: $further=simplify('('.$further.')&('.
268: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
1.2 www 269: } else {
270: $errtext.='Undefined condition ID: '
271: .$hash{'undercond_'.$_}.'. ';
272: }
273: }
274: &traceroute($further,$hash{'goesto_'.$_},$beenhere);
275: } split(/\,/,$hash{'to_'.$rid});
276: }
277: }
278: }
1.1 www 279:
1.19 www 280: # ------------------------------ Cascading conditions, quick access, parameters
1.4 www 281:
282: sub accinit {
283: my ($uri,$short,$fn)=@_;
284: my %acchash=();
285: my %captured=();
286: my $condcounter=0;
1.5 www 287: $acchash{'acc.cond.'.$short.'.0'}=0;
1.4 www 288: map {
289: if ($_=~/^conditions/) {
290: my $expr=$hash{$_};
291: map {
292: my $sub=$_;
293: my $orig=$_;
1.13 www 294: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
1.4 www 295: my $factor=$1;
1.7 www 296: $sub=~s/$factor//g;
297: $sub=~s/^\(/\($factor\(/;
1.4 www 298: $sub.=')';
299: $sub=simplify($sub);
300: $orig=~s/(\W)/\\$1/g;
1.7 www 301: $expr=~s/$orig/$sub/;
1.4 www 302: } ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g);
303: $hash{$_}=$expr;
304: unless (defined($captured{$expr})) {
305: $condcounter++;
306: $captured{$expr}=$condcounter;
1.5 www 307: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
1.4 www 308: }
1.19 www 309: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
310: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
311: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
312: map {
313: my ($typename,$value)=split(/\=/,$_);
314: my ($type,$name)=split(/\:/,$typename);
315: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
316: &Apache::lonnet::unescape($value);
317: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
318: &Apache::lonnet::unescape($type);
319: } split(/\&/,$hash{$_});
320: }
1.4 www 321: } keys %hash;
322: map {
323: if ($_=~/^ids/) {
1.13 www 324: map {
325: my $resid=$_;
1.4 www 326: my $uri=$hash{'src_'.$resid};
1.22 www 327: $uri=~s/^\/adm\/wrapper//;
1.4 www 328: my @uriparts=split(/\//,$uri);
329: my $urifile=$uriparts[$#uriparts];
330: $#uriparts--;
331: my $uripath=join('/',@uriparts);
1.8 www 332: $uripath=~s/^\/res\///;
1.23 www 333: if ($uripath) {
1.13 www 334: my $uricond='0';
1.4 www 335: if (defined($hash{'conditions_'.$resid})) {
1.13 www 336: $uricond=$captured{$hash{'conditions_'.$resid}};
1.4 www 337: }
1.5 www 338: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
1.13 www 339: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
340: /(\&$urifile\:[^\&]*)/) {
341: my $replace=$1;
342: $acchash{'acc.res.'.$short.'.'.$uripath}
343: =~s/$replace/$replace\|$uricond/;
344: } else {
345: $acchash{'acc.res.'.$short.'.'.$uripath}.=
346: $urifile.':'.$uricond.'&';
347: }
1.4 www 348: } else {
1.13 www 349: $acchash{'acc.res.'.$short.'.'.$uripath}=
350: '&'.$urifile.':'.$uricond.'&';
1.23 www 351: }
352: }
1.13 www 353: } split(/\,/,$hash{$_});
354: }
1.4 www 355: } keys %hash;
1.24 ! www 356: $acchash{'acc.res.'.$short.'.'}='&:0&';
1.8 www 357: my $courseuri=$uri;
358: $courseuri=~s/^\/res\///;
1.19 www 359: &Apache::lonnet::delenv('(acc\.|httpref\.)');
1.4 www 360: &Apache::lonnet::appenv(%acchash,
1.9 www 361: "request.course.id" => $short,
1.8 www 362: "request.course.fn" => $fn,
363: "request.course.uri" => $courseuri);
1.4 www 364: }
365:
1.1 www 366: # ---------------------------------------------------- Read map and all submaps
367:
368: sub readmap {
1.9 www 369: my $short=shift;
370: $short=~s/^\///;
371: my %cenv=&Apache::lonnet::coursedescription($short);
372: my $fn=$cenv{'fn'};
373: my $uri;
374: $short=~s/\//\_/g;
375: unless ($uri=$cenv{'url'}) {
376: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
377: "Could not load course $short.</font>");
378: return 'No course data available.';
379: }
1.3 www 380: @cond=('true:normal');
1.11 www 381: unlink($fn.'.db');
382: unlink($fn.'_symb.db');
383: unlink($fn.'.state');
1.19 www 384: unlink($fn.'parms.db');
1.21 www 385: $retfurl='';
1.19 www 386: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) &&
387: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT,0640))) {
1.4 www 388: %hash=();
1.19 www 389: %parmhash=();
1.4 www 390: $errtext='';
391: $pc=0;
392: loadmap($uri);
393: if (defined($hash{'map_start_'.$uri})) {
394: &traceroute('0',$hash{'map_start_'.$uri},'&');
395: &accinit($uri,$short,$fn);
1.2 www 396: }
1.19 www 397: unless ((untie(%hash)) && (untie(%parmhash))) {
1.4 www 398: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
399: "Could not untie coursemap $fn for $uri.</font>");
1.1 www 400: }
1.4 www 401: {
402: my $cfh;
403: if ($cfh=Apache::File->new(">$fn.state")) {
404: print $cfh join("\n",@cond);
405: } else {
1.6 www 406: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
1.4 www 407: "Could not write statemap $fn for $uri.</font>");
408: }
409: }
410: } else {
1.6 www 411: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
1.4 www 412: "Could not tie coursemap $fn for $uri.</font>");
413: }
1.12 www 414: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
1.21 www 415: return ($retfurl,$errtext);
1.1 www 416: }
1.15 www 417:
418: # ------------------------------------------------------- Evaluate state string
419:
420: sub evalstate {
1.21 www 421:
1.15 www 422: my $fn=$ENV{'request.course.fn'}.'.state';
423: my $state='2';
424: if (-e $fn) {
425: my @conditions=();
426: {
427: my $fh=Apache::File->new($fn);
428: @conditions=<$fh>;
429: }
1.21 www 430: my $safeeval = new Safe;
431: my $safehole = new Safe::Hole;
1.15 www 432: $safeeval->permit("entereval");
433: $safeeval->permit(":base_math");
434: $safeeval->deny(":base_io");
1.21 www 435: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
1.15 www 436: map {
437: my $line=$_;
438: chomp($line);
439: my ($condition,$weight)=split(/\:/,$_);
440: if ($safeeval->reval($condition)) {
441: if ($weight eq 'force') {
442: $state.='3';
443: } else {
444: $state.='2';
445: }
446: } else {
447: if ($weight eq 'stop') {
448: $state.='0';
449: } else {
450: $state.='1';
451: }
452: }
453: } @conditions;
454: }
455: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
456: return $state;
457: }
458:
1.1 www 459: 1;
460: __END__
461:
462:
463:
464:
465:
466:
467:
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