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