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