Annotation of rat/lonuserstate.pm, revision 1.149.2.2
1.1 www 1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
1.149.2.2! raeburn 4: # $Id: lonuserstate.pm,v 1.149.2.1 2018/03/29 20:10:47 raeburn Exp $
1.25 www 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: #
1.26 harris41 28: ###
1.1 www 29:
30: package Apache::lonuserstate;
31:
1.26 harris41 32: # ------------------------------------------------- modules used by this module
1.1 www 33: use strict;
34: use HTML::TokeParser;
1.89 albertel 35: use Apache::lonnet;
1.114 www 36: use Apache::lonlocal;
1.26 harris41 37: use Apache::loncommon();
1.1 www 38: use GDBM_File;
1.12 www 39: use Apache::lonmsg;
1.15 www 40: use Safe;
1.21 www 41: use Safe::Hole;
1.15 www 42: use Opcode;
1.73 www 43: use Apache::lonenc;
1.96 albertel 44: use Fcntl qw(:flock);
1.114 www 45: use LONCAPA;
1.138 foxr 46: use File::Basename;
47:
1.114 www 48:
1.15 www 49:
1.1 www 50: # ---------------------------------------------------- Globals for this package
51:
1.138 foxr 52: my $pc; # Package counter is this what 'Guts' calls the map counter?
1.1 www 53: my %hash; # The big tied hash
1.19 www 54: my %parmhash;# The hash with the parameters
1.1 www 55: my @cond; # Array with all of the conditions
56: my $errtext; # variable with all errors
1.116 www 57: my $retfrid; # variable with the very first RID in the course
58: my $retfurl; # first URL
1.29 www 59: my %randompick; # randomly picked resources
1.51 www 60: my %randompickseed; # optional seed for randomly picking resources
1.124 albertel 61: my %randomorder; # maps to order contents randomly
1.146 raeburn 62: my %randomizationcode; # code used to grade folder for bubblesheet exam
1.73 www 63: my %encurl; # URLs in this folder are supposed to be encrypted
64: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
1.149.2.2! raeburn 65: my %rescount; # count of unhidden items in each map
! 66: my %mapcount; # count of unhidden maps in each map
1.61 www 67:
68: # ----------------------------------- Remove version from URL and store in hash
69:
1.134 www 70: sub versionerror {
71: my ($uri,$usedversion,$unusedversion)=@_;
72: return '<br />'.&mt('Version discrepancy: resource [_1] included in both version [_2] and version [_3]. Using version [_2].',
73: $uri,$usedversion,$unusedversion).'<br />';
74: }
75:
1.139 foxr 76: # Removes the version number from a URI and returns the resulting
77: # URI (e.g. mumbly.version.stuff => mumbly.stuff).
78: #
79: # If the URI has not been seen with a versio before the
80: # hash{'version_'.resultingURI} is set to the version number.
81: # If the URI has been seen and the version does not match and error
82: # is added to the error string.
83: #
84: # Parameters:
85: # URI potentially with a version.
86: # Returns:
87: # URI with the version cut out.
88: # See above for side effects.
89: #
90:
1.61 www 91: sub versiontrack {
92: my $uri=shift;
93: if ($uri=~/\.(\d+)\.\w+$/) {
94: my $version=$1;
95: $uri=~s/\.\d+\.(\w+)$/\.$1/;
1.62 www 96: unless ($hash{'version_'.$uri}) {
97: $hash{'version_'.$uri}=$version;
1.134 www 98: } elsif ($version!=$hash{'version_'.$uri}) {
99: $errtext.=&versionerror($uri,$hash{'version_'.$uri},$version);
100: }
1.61 www 101: }
102: return $uri;
103: }
104:
105: # -------------------------------------------------------------- Put in version
106:
107: sub putinversion {
108: my $uri=shift;
1.93 www 109: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
1.61 www 110: if ($hash{'version_'.$uri}) {
111: my $version=$hash{'version_'.$uri};
1.65 www 112: if ($version eq 'mostrecent') { return $uri; }
1.66 www 113: if ($version eq &Apache::lonnet::getversion(
114: &Apache::lonnet::filelocation('',$uri)))
115: { return $uri; }
1.61 www 116: $uri=~s/\.(\w+)$/\.$version\.$1/;
117: }
1.93 www 118: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
1.61 www 119: return $uri;
120: }
121:
122: # ----------------------------------------- Processing versions file for course
123:
124: sub processversionfile {
1.64 www 125: my %cenv=@_;
1.61 www 126: my %versions=&Apache::lonnet::dump('resourceversions',
127: $cenv{'domain'},
128: $cenv{'num'});
1.106 albertel 129: foreach my $ver (keys(%versions)) {
130: if ($ver=~/^error\:/) { return; }
131: $hash{'version_'.$ver}=$versions{$ver};
1.61 www 132: }
133: }
1.45 www 134:
1.138 foxr 135: # --------------------------------------------------------- Loads from disk
1.1 www 136:
1.140 foxr 137:
138: #
139: # Loads a map file.
140: # Note that this may implicitly recurse via parse_resource if one of the resources
141: # is itself composed.
142: #
143: # Parameters:
144: # uri - URI of the map file.
145: # parent_rid - Resource id in the map of the parent resource (0.0 for the top level map)
1.146 raeburn 146: # courseid - Course id for the course for which the map is being loaded
1.140 foxr 147: #
1.1 www 148: sub loadmap {
1.146 raeburn 149: my ($uri,$parent_rid,$courseid)=@_;
1.138 foxr 150:
151: # Is the map already included?
152:
1.114 www 153: if ($hash{'map_pc_'.$uri}) {
1.120 albertel 154: $errtext.='<p class="LC_error">'.
155: &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
156: '</p>';
1.114 www 157: return;
158: }
1.138 foxr 159: # Register the resource in it's map_pc_ [for the URL]
160: # map_id.nnn is the nesting level -> to the URI.
161:
1.1 www 162: $pc++;
163: my $lpc=$pc;
164: $hash{'map_pc_'.$uri}=$lpc;
165: $hash{'map_id_'.$lpc}=$uri;
1.138 foxr 166:
167: # If the parent is of the form n.m hang this map underneath it in the
168: # map hierarchy.
169:
1.136 raeburn 170: if ($parent_rid =~ /^(\d+)\.\d+$/) {
171: my $parent_pc = $1;
172: if (defined($hash{'map_hierarchy_'.$parent_pc})) {
173: $hash{'map_hierarchy_'.$lpc}=$hash{'map_hierarchy_'.$parent_pc}.','.
174: $parent_pc;
175: } else {
176: $hash{'map_hierarchy_'.$lpc}=$parent_pc;
177: }
178: }
1.1 www 179:
1.138 foxr 180: # Determine and check filename of the sequence we need to read:
181:
1.62 www 182: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
1.37 www 183:
184: my $ispage=($fn=~/\.page$/);
1.1 www 185:
1.138 foxr 186: # We can only nest sequences or pages. Anything else is an illegal nest.
187:
188: unless (($fn=~/\.sequence$/) || $ispage) {
1.147 raeburn 189: $errtext.='<br />'.&mt('Invalid map: [_1]',"<tt>$fn</tt>");
1.98 albertel 190: return;
1.1 www 191: }
192:
1.138 foxr 193: # Read the XML that constitutes the file.
194:
1.37 www 195: my $instr=&Apache::lonnet::getfile($fn);
196:
1.124 albertel 197: if ($instr eq -1) {
1.147 raeburn 198: $errtext.= '<br />'
199: .&mt('Map not loaded: The file [_1] does not exist.',
200: "<tt>$fn</tt>");
1.124 albertel 201: return;
202: }
1.22 www 203:
1.138 foxr 204: # Successfully got file, parse it
205:
206: # parse for parameter processing.
207: # Note that these are <param... / > tags
208: # so we only care about 'S' (tag start) nodes.
209:
1.1 www 210:
1.124 albertel 211: my $parser = HTML::TokeParser->new(\$instr);
212: $parser->attr_encoded(1);
1.138 foxr 213:
1.124 albertel 214: # first get all parameters
1.138 foxr 215:
216:
1.124 albertel 217: while (my $token = $parser->get_token) {
218: next if ($token->[0] ne 'S');
219: if ($token->[1] eq 'param') {
220: &parse_param($token,$lpc);
221: }
222: }
1.138 foxr 223:
224: # Get set to take another pass through the XML:
225: # for resources and links.
226:
1.124 albertel 227: $parser = HTML::TokeParser->new(\$instr);
228: $parser->attr_encoded(1);
1.1 www 229:
1.124 albertel 230: my $linkpc=0;
1.1 www 231:
1.124 albertel 232: $fn=~/\.(\w+)$/;
1.1 www 233:
1.124 albertel 234: $hash{'map_type_'.$lpc}=$1;
1.1 www 235:
1.124 albertel 236: my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i);
1.1 www 237:
1.138 foxr 238: # Parse the resources, link and condition tags.
239: # Note that if randomorder or random select is chosen the links and
240: # conditions are meaningless but are determined by the randomization.
241: # This is handled in the next chunk of code.
242:
1.124 albertel 243: my @map_ids;
1.146 raeburn 244: my $codechecked;
1.149.2.2! raeburn 245: $rescount{$lpc} = 0;
! 246: $mapcount{$lpc} = 0;
1.124 albertel 247: while (my $token = $parser->get_token) {
248: next if ($token->[0] ne 'S');
1.138 foxr 249:
250: # Resource
251:
1.124 albertel 252: if ($token->[1] eq 'resource') {
1.146 raeburn 253: my $resource_id = &parse_resource($token,$lpc,$ispage,$uri,$courseid);
1.138 foxr 254: if (defined $resource_id) {
1.146 raeburn 255: push(@map_ids, $resource_id);
1.149.2.2! raeburn 256: if ($hash{'src_'.$lpc.'.'.$resource_id}) {
! 257: $rescount{$lpc} ++;
! 258: if (($hash{'src_'.$lpc.'.'.$resource_id}=~/\.sequence$/) ||
! 259: ($hash{'src_'.$lpc.'.'.$resource_id}=~/\.page$/)) {
! 260: $mapcount{$lpc} ++;
! 261: }
! 262: }
1.146 raeburn 263: unless ($codechecked) {
264: my $startsymb =
265: &Apache::lonnet::encode_symb($hash{'map_id_'.$lpc},$resource_id,
266: $hash{'src_'."$lpc.$resource_id"});
267: my $code =
268: &Apache::lonnet::EXT('resource.0.examcode',$startsymb,undef,undef,
269: undef,undef,$courseid);
270: if ($code) {
271: $randomizationcode{$parent_rid} = $code;
272: }
273: $codechecked = 1;
274: }
1.138 foxr 275: }
276:
277: # Link
278:
1.124 albertel 279: } elsif ($token->[1] eq 'link' && !$randomize) {
280: &make_link(++$linkpc,$lpc,$token->[2]->{'to'},
281: $token->[2]->{'from'},
1.139 foxr 282: $token->[2]->{'condition'}); # note ..condition may be undefined.
1.138 foxr 283:
284: # condition
285:
1.124 albertel 286: } elsif ($token->[1] eq 'condition' && !$randomize) {
287: &parse_condition($token,$lpc);
288: }
289: }
1.146 raeburn 290: undef($codechecked);
1.1 www 291:
1.138 foxr 292: # Handle randomization and random selection
293:
1.124 albertel 294: if ($randomize) {
1.148 raeburn 295: my $advanced;
296: if ($env{'request.course.id'}) {
297: $advanced = (&Apache::lonnet::allowed('adv') eq 'F');
298: } else {
299: $env{'request.course.id'} = $courseid;
300: $advanced = (&Apache::lonnet::allowed('adv') eq 'F');
301: $env{'request.course.id'} = '';
302: }
303: unless ($advanced) {
304: # Order of resources is not randomized if user has and advanced role in the course.
1.124 albertel 305: my $seed;
1.139 foxr 306:
1.148 raeburn 307: # If the map's random seed parameter has been specified
308: # it is used as the basis for computing the seed ...
1.139 foxr 309:
1.124 albertel 310: if (defined($randompickseed{$parent_rid})) {
311: $seed = $randompickseed{$parent_rid};
312: } else {
1.139 foxr 313:
314: # Otherwise the parent's fully encoded symb is used.
315:
1.124 albertel 316: my ($mapid,$resid)=split(/\./,$parent_rid);
317: my $symb=
318: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
319: $resid,$hash{'src_'.$parent_rid});
1.85 albertel 320:
1.124 albertel 321: $seed = $symb;
322: }
1.138 foxr 323:
1.139 foxr 324: # TODO: Here for sure we need to pass along the username/domain
1.138 foxr 325: # so that we can impersonate users in lonprintout e.g.
326:
1.146 raeburn 327: my $setcode;
328: if (defined($randomizationcode{$parent_rid})) {
329: if ($env{'form.CODE'} eq '') {
330: $env{'form.CODE'} = $randomizationcode{$parent_rid};
331: $setcode = 1;
332: }
333: }
334:
1.124 albertel 335: my $rndseed=&Apache::lonnet::rndseed($seed);
336: &Apache::lonnet::setup_random_from_rndseed($rndseed);
1.140 foxr 337:
1.146 raeburn 338: if ($setcode) {
339: undef($env{'form.CODE'});
340: undef($setcode);
341: }
342:
1.140 foxr 343: # Take the set of map ids we have decoded and permute them to a
344: # random order based on the seed set above. All of this is
345: # processing the randomorder parameter if it is set, not
346: # randompick.
347:
1.148 raeburn 348: @map_ids=&Math::Random::random_permutation(@map_ids);
1.124 albertel 349: }
1.139 foxr 350:
1.124 albertel 351: my $from = shift(@map_ids);
352: my $from_rid = $lpc.'.'.$from;
353: $hash{'map_start_'.$uri} = $from_rid;
354: $hash{'type_'.$from_rid}='start';
355:
1.140 foxr 356: # Create links to reflect the random re-ordering done above.
357: # In the code to process the map XML, we did not process links or conditions
358: # if randomorder was set. This means that for an instructor to choose
1.139 foxr 359:
1.124 albertel 360: while (my $to = shift(@map_ids)) {
361: &make_link(++$linkpc,$lpc,$to,$from);
362: my $to_rid = $lpc.'.'.$to;
363: $hash{'type_'.$to_rid}='normal';
364: $from = $to;
365: $from_rid = $to_rid;
366: }
1.1 www 367:
1.124 albertel 368: $hash{'map_finish_'.$uri}= $from_rid;
369: $hash{'type_'.$from_rid}='finish';
1.1 www 370: }
1.121 albertel 371:
1.127 albertel 372: $parser = HTML::TokeParser->new(\$instr);
1.121 albertel 373: $parser->attr_encoded(1);
1.139 foxr 374:
1.149.2.2! raeburn 375: # last parse out the mapalias params. These provide mnemonic
1.140 foxr 376: # tags to resources that can be used in conditions
1.139 foxr 377:
1.121 albertel 378: while (my $token = $parser->get_token) {
379: next if ($token->[0] ne 'S');
380: if ($token->[1] eq 'param') {
381: &parse_mapalias_param($token,$lpc);
382: }
383: }
384: }
385:
1.124 albertel 386:
387: # -------------------------------------------------------------------- Resource
1.138 foxr 388: #
389: # Parses a resource tag to produce the value to push into the
390: # map_ids array.
391: #
392: #
393: # Information about the actual type of resource is provided by the file extension
394: # of the uri (e.g. .problem, .sequence etc. etc.).
395: #
396: # Parameters:
397: # $token - A token from HTML::TokeParser
398: # This is an array that describes the most recently parsed HTML item.
399: # $lpc - Map nesting level (?)
400: # $ispage - True if this resource is encapsulated in a .page (assembled resourcde).
401: # $uri - URI of the enclosing resource.
1.146 raeburn 402: # $courseid - Course id of the course containing the resource being parsed.
1.138 foxr 403: # Returns:
1.139 foxr 404: # Value of the id attribute of the tag.
1.138 foxr 405: #
406: # Note:
407: # The token is an array that contains the following elements:
408: # [0] => 'S' indicating this is a start token
409: # [1] => 'resource' indicating this tag is a <resource> tag.
410: # [2] => Hash of attribute =>value pairs.
411: # [3] => @(keys [2]).
412: # [4] => unused.
413: #
414: # The attributes of the resourcde tag include:
415: #
416: # id - The resource id.
417: # src - The URI of the resource.
418: # type - The resource type (e.g. start and finish).
419: # title - The resource title.
420:
421:
1.124 albertel 422: sub parse_resource {
1.146 raeburn 423: my ($token,$lpc,$ispage,$uri,$courseid) = @_;
1.138 foxr 424:
1.139 foxr 425: # I refuse to countenance code like this that has
1.138 foxr 426: # such a dirty side effect (and forcing this sub to be called within a loop).
427: #
428: # if ($token->[2]->{'type'} eq 'zombie') { next; }
1.139 foxr 429: #
430: # The original code both returns _and_ skips to the next pass of the >caller's<
431: # loop, that's just dirty.
432: #
1.138 foxr 433:
434: # Zombie resources don't produce anything useful.
435:
436: if ($token->[2]->{'type'} eq 'zombie') {
437: return undef;
438: }
439:
1.139 foxr 440: my $rid=$lpc.'.'.$token->[2]->{'id'}; # Resource id in hash is levelcounter.id-in-xml.
441:
442: # Save the hash element type and title:
1.124 albertel 443:
444: $hash{'kind_'.$rid}='res';
445: $hash{'title_'.$rid}=$token->[2]->{'title'};
1.139 foxr 446:
447: # Get the version free URI for the resource.
448: # If a 'version' attribute was supplied, and this resource's version
449: # information has not yet been stored, store it.
450: #
451:
1.124 albertel 452: my $turi=&versiontrack($token->[2]->{'src'});
453: if ($token->[2]->{'version'}) {
454: unless ($hash{'version_'.$turi}) {
455: $hash{'version_'.$turi}=$1;
456: }
457: }
1.139 foxr 458: # Pull out the title and do entity substitution on &colon
459: # Q: Why no other entity substitutions?
460:
1.124 albertel 461: my $title=$token->[2]->{'title'};
462: $title=~s/\&colon\;/\:/gs;
1.139 foxr 463:
464:
465:
466: # I think the point of all this code is to construct a final
467: # URI that apache and its rewrite rules can use to
468: # fetch the resource. Thi s sonly necessary if the resource
469: # is not a page. If the resource is a page then it must be
470: # assembled (at fetch time?).
471:
1.124 albertel 472: unless ($ispage) {
473: $turi=~/\.(\w+)$/;
474: my $embstyle=&Apache::loncommon::fileembstyle($1);
475: if ($token->[2]->{'external'} eq 'true') { # external
1.130 raeburn 476: $turi=~s/^https?\:\/\//\/adm\/wrapper\/ext\//;
1.124 albertel 477: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
478: if (($embstyle eq 'img')
479: || ($embstyle eq 'emb')
480: || ($embstyle eq 'wrp')) {
481: $turi='/adm/wrapper'.$turi;
482: } elsif ($embstyle eq 'ssi') {
483: #do nothing with these
484: } elsif ($turi!~/\.(sequence|page)$/) {
485: $turi='/adm/coursedocs/showdoc'.$turi;
486: }
487: } elsif ($turi=~/\S/) { # normal non-empty internal resource
488: my $mapdir=$uri;
489: $mapdir=~s/[^\/]+$//;
490: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
491: if (($embstyle eq 'img')
492: || ($embstyle eq 'emb')
493: || ($embstyle eq 'wrp')) {
494: $turi='/adm/wrapper'.$turi;
495: }
496: }
497: }
1.139 foxr 498: # Store reverse lookup, remove query string resource 'ids'_uri => resource id.
499: # If the URI appears more than one time in the sequence, it's resourcde
500: # id's are constructed as a comma spearated list.
501:
1.124 albertel 502: my $idsuri=$turi;
503: $idsuri=~s/\?.+$//;
504: if (defined($hash{'ids_'.$idsuri})) {
505: $hash{'ids_'.$idsuri}.=','.$rid;
506: } else {
507: $hash{'ids_'.$idsuri}=''.$rid;
508: }
509:
1.139 foxr 510:
511:
1.135 raeburn 512: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard|viewclasslist)$/) {
1.124 albertel 513: $turi.='?register=1';
514: }
515:
1.139 foxr 516:
517: # resource id lookup: 'src'_resourc-di => URI decorated with a query
518: # parameter as above if necessary due to the resource type.
519:
1.124 albertel 520: $hash{'src_'.$rid}=$turi;
1.139 foxr 521:
522: # Mark the external-ness of the resource:
1.124 albertel 523:
524: if ($token->[2]->{'external'} eq 'true') {
525: $hash{'ext_'.$rid}='true:';
526: } else {
527: $hash{'ext_'.$rid}='false:';
528: }
1.139 foxr 529:
530: # If the resource is a start/finish resource set those
531: # entries in the has so that navigation knows where everything starts.
532: # TODO? If there is a malformed sequence that has no start or no finish
533: # resource, should this be detected and errors thrown? How would such a
534: # resource come into being other than being manually constructed by a person
535: # and then uploaded? Could that happen if an author decided a sequence was almost
536: # right edited it by hand and then reuploaded it to 'fix it' but accidently cut the
537: # start or finish resources?
538: #
539: # All resourcess also get a type_id => (start | finish | normal) hash entr.
540: #
1.124 albertel 541: if ($token->[2]->{'type'}) {
542: $hash{'type_'.$rid}=$token->[2]->{'type'};
543: if ($token->[2]->{'type'} eq 'start') {
544: $hash{'map_start_'.$uri}="$rid";
545: }
546: if ($token->[2]->{'type'} eq 'finish') {
547: $hash{'map_finish_'.$uri}="$rid";
548: }
549: } else {
550: $hash{'type_'.$rid}='normal';
551: }
1.139 foxr 552:
553: # Sequences end pages are constructed entities. They require that the
554: # map that defines _them_ be loaded as well into the hash...with this resourcde
555: # as the base of the nesting.
556: # Resources like that are also marked with is_map_id => 1 entries.
557: #
1.124 albertel 558:
559: if (($turi=~/\.sequence$/) ||
560: ($turi=~/\.page$/)) {
561: $hash{'is_map_'.$rid}=1;
1.146 raeburn 562: &loadmap($turi,$rid,$courseid);
1.124 albertel 563: }
564: return $token->[2]->{'id'};
565: }
566:
1.139 foxr 567: #-------------------------------------------------------------------- link
568: # Links define how you are allowed to move from one resource to another.
569: # They are the transition edges in the directed graph that a map is.
570: # This sub takes informatino from a <link> tag and constructs the
571: # navigation bits and pieces of a map. There is no requirement that the
572: # resources that are linke are already defined, however clearly the map is
573: # badly broken if they are not _eventually_ defined.
574: #
575: # Note that links can be unconditional or conditional.
576: #
577: # Parameters:
578: # linkpc - The link counter for this level of map nesting (this is
579: # reset to zero by loadmap prior to starting to process
580: # links for map).
581: # lpc - The map level ocounter (how deeply nested this map is in
582: # the hierarchy of maps that are recursively read in.
583: # to - resource id (within the XML) of the target of the edge.
584: # from - resource id (within the XML) of the source of the edge.
585: # condition- id of condition associated with the edge (also within the XML).
586: #
587:
1.124 albertel 588: sub make_link {
589: my ($linkpc,$lpc,$to,$from,$condition) = @_;
590:
1.139 foxr 591: # Compute fully qualified ids for the link, the
592: # and from/to by prepending lpc.
593: #
594:
1.124 albertel 595: my $linkid=$lpc.'.'.$linkpc;
596: my $goesto=$lpc.'.'.$to;
597: my $comesfrom=$lpc.'.'.$from;
598: my $undercond=0;
599:
1.139 foxr 600:
601: # If there is a condition, qualify it with the level counter.
602:
1.124 albertel 603: if ($condition) {
604: $undercond=$lpc.'.'.$condition;
605: }
606:
1.139 foxr 607: # Links are represnted by:
608: # goesto_.fuullyqualifedlinkid => fully qualified to
609: # comesfrom.fullyqualifiedlinkid => fully qualified from
610: # undercond_.fullyqualifiedlinkid => fully qualified condition id.
611:
1.124 albertel 612: $hash{'goesto_'.$linkid}=$goesto;
613: $hash{'comesfrom_'.$linkid}=$comesfrom;
614: $hash{'undercond_'.$linkid}=$undercond;
615:
1.139 foxr 616: # In addition:
617: # to_.fully qualified from => comma separated list of
618: # link ids with that from.
619: # Similarly:
620: # from_.fully qualified to => comma separated list of link ids`
621: # with that to.
622: # That allows us given a resource id to know all edges that go to it
623: # and leave from it.
624: #
625:
1.124 albertel 626: if (defined($hash{'to_'.$comesfrom})) {
627: $hash{'to_'.$comesfrom}.=','.$linkid;
628: } else {
629: $hash{'to_'.$comesfrom}=''.$linkid;
630: }
631: if (defined($hash{'from_'.$goesto})) {
632: $hash{'from_'.$goesto}.=','.$linkid;
633: } else {
634: $hash{'from_'.$goesto}=''.$linkid;
635: }
636: }
637:
638: # ------------------------------------------------------------------- Condition
1.139 foxr 639: #
640: # Processes <condition> tags, storing sufficient information about them
641: # in the hash so that they can be evaluated and used to conditionalize
642: # what is presented to the student.
643: #
644: # these can have the following attributes
645: #
646: # id = A unique identifier of the condition within the map.
647: #
648: # value = Is a perl script-let that, when evaluated in safe space
649: # determines whether or not the condition is true.
650: # Normally this takes the form of a test on an Apache::lonnet::EXT call
651: # to find the value of variable associated with a resource in the
652: # map identified by a mapalias.
653: # Here's a fragment of XML code that illustrates this:
654: #
655: # <param to="5" value="mainproblem" name="parameter_0_mapalias" type="string" />
656: # <resource src="" id="1" type="start" title="Start" />
657: # <resource src="/res/msu/albertel/b_and_c/p1.problem" id="5" title="p1.problem" />
658: # <condition value="&EXT('user.resource.resource.0.tries','mainproblem')
659: # <2 " id="61" type="stop" />
660: # <link to="5" index="1" from="1" condition="61" />
661: #
662: # In this fragment:
663: # - The param tag establishes an alias to resource id 5 of 'mainproblem'.
664: # - The resource that is the start of the map is identified.
665: # - The resource tag identifies the resource associated with this tag
666: # and gives it the id 5.
667: # - The condition is true if the tries variable associated with mainproblem
668: # is less than 2 (that is the user has had more than 2 tries).
669: # The condition type is a stop condition which inhibits(?) the associated
670: # link if the condition is false.
671: # - The link to resource 5 from resource 1 is affected by this condition.
672: #
673: # type = Type of the condition. The type determines how the condition affects the
674: # link associated with it and is one of
675: # - 'force'
676: # - 'stop'
677: # anything else including not supplied..which treated as:
678: # - 'normal'.
679: # Presumably maps get created by the resource assembly tool and therefore
680: # illegal type values won't squirm their way into the XML.
681: #
682: # Side effects:
683: # - The kind_level-qualified-condition-id hash element is set to 'cond'.
684: # - The condition text is pushed into the cond array and its element number is
685: # set in the condid_level-qualified-condition-id element of the hash.
686: # - The condition type is colon appneded to the cond array element for this condition.
1.124 albertel 687: sub parse_condition {
688: my ($token,$lpc) = @_;
689: my $rid=$lpc.'.'.$token->[2]->{'id'};
690:
691: $hash{'kind_'.$rid}='cond';
692:
693: my $condition = $token->[2]->{'value'};
694: $condition =~ s/[\n\r]+/ /gs;
695: push(@cond, $condition);
696: $hash{'condid_'.$rid}=$#cond;
697: if ($token->[2]->{'type'}) {
698: $cond[$#cond].=':'.$token->[2]->{'type'};
699: } else {
700: $cond[$#cond].=':normal';
701: }
702: }
703:
704: # ------------------------------------------------------------------- Parameter
1.138 foxr 705: # Parse a <parameter> tag in the map.
706: # Parmameters:
707: # $token Token array for a start tag from HTML::TokeParser
708: # [0] = 'S'
709: # [1] = tagname ("param")
710: # [2] = Hash of {attribute} = values.
711: # [3] = Array of the keys in [2].
712: # [4] = unused.
713: # $lpc Current map nesting level.a
714: #
715: # Typical attributes:
716: # to=n - Number of the resource the parameter applies to.
717: # type=xx - Type of parameter value (e.g. string_yesno or int_pos).
1.149.2.2! raeburn 718: # name=xxx - Name of parameter (e.g. parameter_randompick or parameter_randomorder).
1.138 foxr 719: # value=xxx - value of the parameter.
1.124 albertel 720:
721: sub parse_param {
722: my ($token,$lpc) = @_;
1.138 foxr 723: my $referid=$lpc.'.'.$token->[2]->{'to'}; # Resource param applies to.
724: my $name=$token->[2]->{'name'}; # Name of parameter
1.124 albertel 725: my $part;
1.138 foxr 726:
727:
728: if ($name=~/^parameter_(.*)_/) {
1.124 albertel 729: $part=$1;
730: } else {
731: $part=0;
732: }
1.138 foxr 733:
734: # Peel the parameter_ off the parameter name.
735:
1.124 albertel 736: $name=~s/^.*_([^_]*)$/$1/;
1.138 foxr 737:
738: # The value is:
739: # type.part.name.value
740:
1.124 albertel 741: my $newparam=
742: &escape($token->[2]->{'type'}).':'.
743: &escape($part.'.'.$name).'='.
744: &escape($token->[2]->{'value'});
1.138 foxr 745:
746: # The hash key is param_resourceid.
747: # Multiple parameters for a single resource are & separated in the hash.
748:
749:
1.124 albertel 750: if (defined($hash{'param_'.$referid})) {
751: $hash{'param_'.$referid}.='&'.$newparam;
752: } else {
753: $hash{'param_'.$referid}=''.$newparam;
754: }
1.138 foxr 755: #
756: # These parameters have to do with randomly selecting
757: # resources, therefore a separate hash is also created to
758: # make it easy to locate them when actually computing the resource set later on
759: # See the code conditionalized by ($randomize) in loadmap().
760:
761: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) { # Random selection turned on
1.124 albertel 762: $randompick{$referid}=$token->[2]->{'value'};
763: }
1.138 foxr 764: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) { # Randomseed provided.
1.124 albertel 765: $randompickseed{$referid}=$token->[2]->{'value'};
766: }
1.138 foxr 767: if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) { # Random order turned on.
1.124 albertel 768: $randomorder{$referid}=$token->[2]->{'value'};
769: }
1.138 foxr 770:
771: # These parameters have to do with how the URLs of resources are presented to
772: # course members(?). encrypturl presents encypted url's while
773: # hiddenresource hides the URL.
774: #
775:
1.124 albertel 776: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
777: if ($token->[2]->{'value'}=~/^yes$/i) {
778: $encurl{$referid}=1;
779: }
780: }
781: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
782: if ($token->[2]->{'value'}=~/^yes$/i) {
783: $hiddenurl{$referid}=1;
784: }
785: }
786: }
1.140 foxr 787: #
788: # Parse mapalias parameters.
789: # these are tags of the form:
790: # <param to="nn"
791: # value="some-alias-for-resourceid-nn"
792: # name="parameter_0_mapalias"
793: # type="string" />
794: # A map alias is a textual name for a resource:
795: # - The to attribute identifies the resource (this gets level qualified below)
796: # - The value attributes provides the alias string.
797: # - name must be of the regexp form: /^parameter_(0_)*mapalias$/
798: # - e.g. the string 'parameter_' followed by 0 or more "0_" strings
799: # terminating with the string 'mapalias'.
800: # Examples:
801: # 'parameter_mapalias', 'parameter_0_mapalias', parameter_0_0_mapalias'
802: # Invalid to ids are silently ignored.
803: #
804: # Parameters:
805: # token - The token array fromthe HMTML::TokeParser
806: # lpc - The current map level counter.
807: #
1.121 albertel 808: sub parse_mapalias_param {
809: my ($token,$lpc) = @_;
1.140 foxr 810:
811: # Fully qualify the to value and ignore the alias if there is no
812: # corresponding resource.
813:
1.121 albertel 814: my $referid=$lpc.'.'.$token->[2]->{'to'};
815: return if (!exists($hash{'src_'.$referid}));
816:
1.140 foxr 817: # If this is a valid mapalias parameter,
818: # Append the target id to the count_mapalias element for that
819: # alias so that we can detect doubly defined aliases
820: # e.g.:
821: # <param to="1" value="george" name="parameter_0_mapalias" type="string" />
822: # <param to="2" value="george" name="parameter_0_mapalias" type="string" />
823: #
824: # The example above is trivial but the case that's important has to do with
825: # constructing a map that includes a nested map where the nested map may have
826: # aliases that conflict with aliases established in the enclosing map.
827: #
828: # ...and create/update the hash mapalias entry to actually store the alias.
829: #
830:
1.121 albertel 831: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
1.122 albertel 832: &count_mapalias($token->[2]->{'value'},$referid);
1.121 albertel 833: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
834: }
1.1 www 835: }
836:
1.3 www 837: # --------------------------------------------------------- Simplify expression
838:
1.140 foxr 839:
840: #
841: # Someone should really comment this to describe what it does to what and why.
842: #
1.3 www 843: sub simplify {
1.85 albertel 844: my $expression=shift;
1.101 albertel 845: # (0&1) = 1
1.105 albertel 846: $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
1.3 www 847: # (8)=8
1.105 albertel 848: $expression=~s/\(([_\.\d]+)\)/$1/g;
1.3 www 849: # 8&8=8
1.105 albertel 850: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
1.3 www 851: # 8|8=8
1.141 raeburn 852: $expression=~s/([^_\.\d])([_\.\d]+)(?:\|\2)+([^_\.\d])/$1$2$3/g;
1.3 www 853: # (5&3)&4=5&3&4
1.105 albertel 854: $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
1.3 www 855: # (((5&3)|(4&6)))=((5&3)|(4&6))
1.105 albertel 856: $expression=~
857: s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
1.3 www 858: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
1.85 albertel 859: $expression=~
1.105 albertel 860: s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
1.85 albertel 861: return $expression;
1.3 www 862: }
863:
1.2 www 864: # -------------------------------------------------------- Build condition hash
865:
1.140 foxr 866: #
867: # Traces a route recursively through the map after it has been loaded
868: # (I believe this really visits each resourcde that is reachable fromt he
869: # start top node.
870: #
871: # - Marks hidden resources as hidden.
872: # - Marks which resource URL's must be encrypted.
873: # - Figures out (if necessary) the first resource in the map.
874: # - Further builds the chunks of the big hash that define how
875: # conditions work
876: #
877: # Note that the tracing strategy won't visit resources that are not linked to
878: # anything or islands in the map (groups of resources that form a path but are not
879: # linked in to the path that can be traced from the start resource...but that's ok
880: # because by definition, those resources are not reachable by users of the course.
881: #
882: # Parameters:
883: # sofar - _URI of the prior entry or 0 if this is the top.
884: # rid - URI of the resource to visit.
885: # beenhere - list of resources (each resource enclosed by &'s) that have
886: # already been visited.
887: # encflag - If true the resource that resulted in a recursive call to us
888: # has an encoded URL (which means contained resources should too).
889: # hdnflag - If true,the resource that resulted in a recursive call to us
890: # was hidden (which means contained resources should be hidden too).
891: # Returns
892: # new value indicating how far the map has been traversed (the sofar).
893: #
1.2 www 894: sub traceroute {
1.77 www 895: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
1.81 albertel 896: my $newsofar=$sofar=simplify($sofar);
1.140 foxr 897:
1.120 albertel 898: unless ($beenhere=~/\&\Q$rid\E\&/) {
1.85 albertel 899: $beenhere.=$rid.'&';
900: my ($mapid,$resid)=split(/\./,$rid);
901: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
902: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
1.91 albertel 903:
1.90 albertel 904: if ($hdnflag || lc($hidden) eq 'yes') {
905: $hiddenurl{$rid}=1;
1.91 albertel 906: }
907: if (!$hdnflag && lc($hidden) eq 'no') {
1.90 albertel 908: delete($hiddenurl{$rid});
909: }
1.91 albertel 910:
1.85 albertel 911: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
912: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
1.140 foxr 913:
1.116 www 914: if (($retfrid eq '') && ($hash{'src_'.$rid})
1.85 albertel 915: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
1.116 www 916: $retfrid=$rid;
1.85 albertel 917: }
1.140 foxr 918:
1.85 albertel 919: if (defined($hash{'conditions_'.$rid})) {
920: $hash{'conditions_'.$rid}=simplify(
1.103 albertel 921: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
1.85 albertel 922: } else {
923: $hash{'conditions_'.$rid}=$sofar;
924: }
1.107 albertel 925:
926: # if the expression is just the 0th condition keep it
927: # otherwise leave a pointer to this condition expression
1.140 foxr 928:
1.107 albertel 929: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
930:
1.140 foxr 931: # Recurse if the resource is a map:
932:
1.85 albertel 933: if (defined($hash{'is_map_'.$rid})) {
934: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
935: $sofar=$newsofar=
936: &traceroute($sofar,
1.126 albertel 937: $hash{'map_start_'.$hash{'src_'.$rid}},
938: $beenhere,
1.85 albertel 939: $encflag || $encurl{$rid},
940: $hdnflag || $hiddenurl{$rid});
941: }
942: }
1.140 foxr 943:
944: # Processes links to this resource:
945: # - verify the existence of any conditionals on the link to here.
946: # - Recurse to any resources linked to us.
947: #
1.85 albertel 948: if (defined($hash{'to_'.$rid})) {
1.106 albertel 949: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.2 www 950: my $further=$sofar;
1.140 foxr 951: #
952: # If there's a condition associated with this link be sure
953: # it's been defined else that's an error:
954: #
1.106 albertel 955: if ($hash{'undercond_'.$id}) {
956: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
1.105 albertel 957: $further=simplify('('.'_'.$rid.')&('.
1.106 albertel 958: $hash{'condid_'.$hash{'undercond_'.$id}}.')');
1.85 albertel 959: } else {
1.147 raeburn 960: $errtext.= '<br />'.
961: &mt('Undefined condition ID: [_1]',
962: $hash{'undercond_'.$id});
1.85 albertel 963: }
1.2 www 964: }
1.140 foxr 965: # Recurse to resoruces that have to's to us.
1.106 albertel 966: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
1.81 albertel 967: $encflag,$hdnflag);
1.85 albertel 968: }
969: }
1.2 www 970: }
1.81 albertel 971: return $newsofar;
1.2 www 972: }
1.1 www 973:
1.19 www 974: # ------------------------------ Cascading conditions, quick access, parameters
1.4 www 975:
1.140 foxr 976: #
977: # Seems a rather strangely named sub given what the comment above says it does.
978:
979:
1.4 www 980: sub accinit {
981: my ($uri,$short,$fn)=@_;
982: my %acchash=();
983: my %captured=();
984: my $condcounter=0;
1.5 www 985: $acchash{'acc.cond.'.$short.'.0'}=0;
1.140 foxr 986:
987: # This loop is only interested in conditions and
988: # parameters in the big hash:
989:
1.104 albertel 990: foreach my $key (keys(%hash)) {
1.140 foxr 991:
992: # conditions:
993:
1.104 albertel 994: if ($key=~/^conditions/) {
995: my $expr=$hash{$key};
1.140 foxr 996:
1.109 albertel 997: # try to find and factor out common sub-expressions
1.140 foxr 998: # Any subexpression that is found is simplified, removed from
999: # the original condition expression and the simplified sub-expression
1000: # substituted back in to the epxression..I'm not actually convinced this
1001: # factors anything out...but instead maybe simplifies common factors(?)
1002:
1.105 albertel 1003: foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
1.104 albertel 1004: my $orig=$sub;
1.109 albertel 1005:
1006: my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
1007: next if (!defined($factor));
1008:
1009: $sub=~s/\Q$factor\E//g;
1.85 albertel 1010: $sub=~s/^\(/\($factor\(/;
1011: $sub.=')';
1012: $sub=simplify($sub);
1.109 albertel 1013: $expr=~s/\Q$orig\E/$sub/;
1.85 albertel 1014: }
1.104 albertel 1015: $hash{$key}=$expr;
1.140 foxr 1016:
1017: # If not yet seen, record in acchash and that we've seen it.
1018:
1.85 albertel 1019: unless (defined($captured{$expr})) {
1020: $condcounter++;
1021: $captured{$expr}=$condcounter;
1022: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
1023: }
1.140 foxr 1024: # Parameters:
1025:
1.104 albertel 1026: } elsif ($key=~/^param_(\d+)\.(\d+)/) {
1.86 albertel 1027: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
1028: $hash{'src_'.$1.'.'.$2});
1.104 albertel 1029: foreach my $param (split(/\&/,$hash{$key})) {
1030: my ($typename,$value)=split(/\=/,$param);
1.85 albertel 1031: my ($type,$name)=split(/\:/,$typename);
1.114 www 1032: $parmhash{$prefix.'.'.&unescape($name)}=
1033: &unescape($value);
1034: $parmhash{$prefix.'.'.&unescape($name).'.type'}=
1035: &unescape($type);
1.85 albertel 1036: }
1037: }
1.26 harris41 1038: }
1.140 foxr 1039: # This loop only processes id entries in the big hash.
1040:
1.104 albertel 1041: foreach my $key (keys(%hash)) {
1042: if ($key=~/^ids/) {
1043: foreach my $resid (split(/\,/,$hash{$key})) {
1.85 albertel 1044: my $uri=$hash{'src_'.$resid};
1.100 albertel 1045: my ($uripath,$urifile) =
1046: &Apache::lonnet::split_uri_for_cond($uri);
1.85 albertel 1047: if ($uripath) {
1048: my $uricond='0';
1049: if (defined($hash{'conditions_'.$resid})) {
1050: $uricond=$captured{$hash{'conditions_'.$resid}};
1051: }
1052: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
1053: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
1054: /(\&\Q$urifile\E\:[^\&]*)/) {
1055: my $replace=$1;
1056: my $regexp=$replace;
1057: #$regexp=~s/\|/\\\|/g;
1.105 albertel 1058: $acchash{'acc.res.'.$short.'.'.$uripath} =~
1.104 albertel 1059: s/\Q$regexp\E/$replace\|$uricond/;
1.85 albertel 1060: } else {
1061: $acchash{'acc.res.'.$short.'.'.$uripath}.=
1062: $urifile.':'.$uricond.'&';
1063: }
1064: } else {
1065: $acchash{'acc.res.'.$short.'.'.$uripath}=
1066: '&'.$urifile.':'.$uricond.'&';
1067: }
1068: }
1069: }
1070: }
1.26 harris41 1071: }
1.24 www 1072: $acchash{'acc.res.'.$short.'.'}='&:0&';
1.8 www 1073: my $courseuri=$uri;
1074: $courseuri=~s/^\/res\///;
1.131 raeburn 1075: my $regexp = 1;
1076: &Apache::lonnet::delenv('(acc\.|httpref\.)',$regexp);
1.128 raeburn 1077: &Apache::lonnet::appenv(\%acchash);
1.4 www 1078: }
1079:
1.73 www 1080: # ---------------- Selectively delete from randompick maps and hidden url parms
1.29 www 1081:
1.73 www 1082: sub hiddenurls {
1.31 www 1083: my $randomoutentry='';
1.149 raeburn 1084: foreach my $rid (keys(%randompick)) {
1.29 www 1085: my $rndpick=$randompick{$rid};
1086: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
1087: # ------------------------------------------- put existing resources into array
1088: my @currentrids=();
1.106 albertel 1089: foreach my $key (sort(keys(%hash))) {
1090: if ($key=~/^src_($mpc\.\d+)/) {
1.29 www 1091: if ($hash{'src_'.$1}) { push @currentrids, $1; }
1092: }
1093: }
1.50 albertel 1094: # rids are number.number and we want to numercially sort on
1095: # the second number
1096: @currentrids=sort {
1097: my (undef,$aid)=split(/\./,$a);
1098: my (undef,$bid)=split(/\./,$b);
1099: $aid <=> $bid;
1100: } @currentrids;
1.29 www 1101: next if ($#currentrids<$rndpick);
1102: # -------------------------------- randomly eliminate the ones that should stay
1.50 albertel 1103: my (undef,$id)=split(/\./,$rid);
1.51 www 1104: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
1.146 raeburn 1105: my $setcode;
1106: if (defined($randomizationcode{$rid})) {
1107: if ($env{'form.CODE'} eq '') {
1108: $env{'form.CODE'} = $randomizationcode{$rid};
1109: $setcode = 1;
1110: }
1111: }
1.50 albertel 1112: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
1.146 raeburn 1113: if ($setcode) {
1114: undef($env{'form.CODE'});
1115: undef($setcode);
1116: }
1.58 albertel 1117: &Apache::lonnet::setup_random_from_rndseed($rndseed);
1.50 albertel 1118: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
1119: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
1120: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
1.29 www 1121: # -------------------------------------------------------- delete the leftovers
1122: for (my $k=0; $k<=$#currentrids; $k++) {
1123: if ($currentrids[$k]) {
1124: $hash{'randomout_'.$currentrids[$k]}=1;
1.32 www 1125: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
1.149.2.2! raeburn 1126: if ($rescount{$mapid}) {
! 1127: $rescount{$mapid} --;
! 1128: }
! 1129: if ($hash{'is_map_'.$currentrids[$k]}) {
! 1130: if ($mapcount{$mapid}) {
! 1131: $mapcount{$mapid} --;
! 1132: }
! 1133: }
1.32 www 1134: $randomoutentry.='&'.
1.86 albertel 1135: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
1136: $resid,
1137: $hash{'src_'.$currentrids[$k]}
1138: ).'&';
1.29 www 1139: }
1140: }
1.31 www 1141: }
1.73 www 1142: # ------------------------------ take care of explicitly hidden urls or folders
1.149 raeburn 1143: foreach my $rid (keys(%hiddenurl)) {
1.73 www 1144: $hash{'randomout_'.$rid}=1;
1145: my ($mapid,$resid)=split(/\./,$rid);
1.149.2.2! raeburn 1146: if ($rescount{$mapid}) {
! 1147: $rescount{$mapid} --;
! 1148: }
! 1149: if ($hash{'is_map_'.$rid}) {
! 1150: if ($mapcount{$mapid}) {
! 1151: $mapcount{$mapid} --;
! 1152: }
! 1153: }
1.73 www 1154: $randomoutentry.='&'.
1.86 albertel 1155: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
1156: $hash{'src_'.$rid}).'&';
1.73 www 1157: }
1158: # --------------------------------------- append randomout entry to environment
1.31 www 1159: if ($randomoutentry) {
1.128 raeburn 1160: &Apache::lonnet::appenv({'acc.randomout' => $randomoutentry});
1.29 www 1161: }
1162: }
1163:
1.149.2.2! raeburn 1164: # -------------------------------------- populate big hash with map breadcrumbs
! 1165:
! 1166: # Create map_breadcrumbs_$pc from map_hierarchy_$pc by omitting intermediate
! 1167: # maps not shown in Course Contents table.
! 1168:
! 1169: sub mapcrumbs {
! 1170: foreach my $key (keys(%rescount)) {
! 1171: if ($hash{'map_hierarchy_'.$key}) {
! 1172: my $skipnext = 0;
! 1173: foreach my $id (split(/,/,$hash{'map_hierarchy_'.$key}),$key) {
! 1174: unless ($skipnext) {
! 1175: $hash{'map_breadcrumbs_'.$key} .= "$id,";
! 1176: }
! 1177: unless (($id == 0) || ($id == 1)) {
! 1178: if ((!$rescount{$id}) || ($rescount{$id} == 1 && $mapcount{$id} == 1)) {
! 1179: $skipnext = 1;
! 1180: } else {
! 1181: $skipnext = 0;
! 1182: }
! 1183: }
! 1184: }
! 1185: $hash{'map_breadcrumbs_'.$key} =~ s/,$//;
! 1186: }
! 1187: }
! 1188: }
! 1189:
1.1 www 1190: # ---------------------------------------------------- Read map and all submaps
1191:
1192: sub readmap {
1.85 albertel 1193: my $short=shift;
1194: $short=~s/^\///;
1.138 foxr 1195:
1196: # TODO: Hidden dependency on current user:
1197:
1198: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
1199:
1.85 albertel 1200: my $fn=$cenv{'fn'};
1201: my $uri;
1202: $short=~s/\//\_/g;
1203: unless ($uri=$cenv{'url'}) {
1.133 raeburn 1204: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.85 albertel 1205: "Could not load course $short.</font>");
1.114 www 1206: return ('',&mt('No course data available.'));;
1.85 albertel 1207: }
1208: @cond=('true:normal');
1.96 albertel 1209:
1.149.2.2! raeburn 1210: unless (open(LOCKFILE,">","$fn.db.lock")) {
1.138 foxr 1211: #
1212: # Most likely a permissions problem on the lockfile or its directory.
1213: #
1.133 raeburn 1214: $retfurl = '';
1.144 raeburn 1215: return ($retfurl,'<br />'.&mt('Map not loaded - Lock file could not be opened when reading map:').' <tt>'.$fn.'</tt>.');
1.133 raeburn 1216: }
1.96 albertel 1217: my $lock=0;
1.132 raeburn 1218: my $gotstate=0;
1.138 foxr 1219:
1220: # If we can get the lock without delay any files there are idle
1221: # and from some prior request. We'll kill them off and regenerate them:
1222:
1223: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
1224: $lock=1; # Remember that we hold the lock.
1.132 raeburn 1225: &unlink_tmpfiles($fn);
1.96 albertel 1226: }
1.85 albertel 1227: undef %randompick;
1.149.2.1 raeburn 1228: undef %randompickseed;
1229: undef %randomorder;
1.149.2.2! raeburn 1230: undef %randomizationcode;
1.85 albertel 1231: undef %hiddenurl;
1232: undef %encurl;
1.149.2.2! raeburn 1233: undef %rescount;
! 1234: undef %mapcount;
1.116 www 1235: $retfrid='';
1.144 raeburn 1236: $errtext='';
1.138 foxr 1237: my ($untiedhash,$untiedparmhash,$tiedhash,$tiedparmhash); # More state flags.
1238:
1239: # if we got the lock, regenerate course regnerate empty files and tie them.
1240:
1.132 raeburn 1241: if ($lock) {
1242: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
1243: $tiedhash = 1;
1244: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
1245: $tiedparmhash = 1;
1.138 foxr 1246: $gotstate = &build_tmp_hashes($uri,
1247: $fn,
1248: $short,
1249: \%cenv); # TODO: Need to provide requested user@dom
1.132 raeburn 1250: unless ($gotstate) {
1251: &Apache::lonnet::logthis('Failed to write statemap at first attempt '.$fn.' for '.$uri.'.</font>');
1252: }
1253: $untiedparmhash = untie(%parmhash);
1254: unless ($untiedparmhash) {
1255: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1256: 'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
1257: }
1258: }
1259: $untiedhash = untie(%hash);
1260: unless ($untiedhash) {
1261: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1262: 'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
1263: }
1264: }
1.138 foxr 1265: flock(LOCKFILE,LOCK_UN); # RF: this is what I don't get unless there are other
1266: # unlocked places the remainder happens..seems like if we
1267: # just kept the lock here the rest of the code would have
1268: # been much easier?
1.132 raeburn 1269: }
1270: unless ($lock && $tiedhash && $tiedparmhash) {
1.87 albertel 1271: # if we are here it is likely because we are already trying to
1272: # initialize the course in another child, busy wait trying to
1273: # tie the hashes for the next 90 seconds, if we succeed forward
1274: # them on to navmaps, if we fail, throw up the Could not init
1275: # course screen
1.138 foxr 1276: #
1277: # RF: I'm not seeing the case where the ties/unties can fail in a way
1278: # that can be remedied by this. Since we owned the lock seems
1279: # Tie/untie failures are a result of something like a permissions problem instead?
1280: #
1281:
1282: # In any vent, undo what we did manage to do above first:
1.96 albertel 1283: if ($lock) {
1284: # Got the lock but not the DB files
1285: flock(LOCKFILE,LOCK_UN);
1.132 raeburn 1286: $lock = 0;
1.96 albertel 1287: }
1.132 raeburn 1288: if ($tiedhash) {
1289: unless($untiedhash) {
1290: untie(%hash);
1291: }
1292: }
1293: if ($tiedparmhash) {
1294: unless($untiedparmhash) {
1295: untie(%parmhash);
1296: }
1297: }
1.138 foxr 1298: # Log our failure:
1299:
1.133 raeburn 1300: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.132 raeburn 1301: "Could not tie coursemap $fn for $uri.</font>");
1302: $tiedhash = '';
1303: $tiedparmhash = '';
1.87 albertel 1304: my $i=0;
1.138 foxr 1305:
1306: # Keep on retrying the lock for 90 sec until we succeed.
1307:
1.87 albertel 1308: while($i<90) {
1309: $i++;
1310: sleep(1);
1.132 raeburn 1311: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
1.138 foxr 1312:
1313: # Got the lock, tie the hashes...the assumption in this code is
1314: # that some other worker thread has created the db files quite recently
1315: # so no load is needed:
1316:
1.132 raeburn 1317: $lock = 1;
1318: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
1319: $tiedhash = 1;
1320: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
1321: $tiedparmhash = 1;
1322: if (-e "$fn.state") {
1323: $retfurl='/adm/navmaps';
1.138 foxr 1324:
1325: # BUG BUG: Side effect!
1326: # Should conditionalize on something so that we can use this
1327: # to load maps for courses that are not current?
1328: #
1.132 raeburn 1329: &Apache::lonnet::appenv({"request.course.id" => $short,
1330: "request.course.fn" => $fn,
1.143 raeburn 1331: "request.course.uri" => $uri,
1332: "request.course.tied" => time});
1333:
1.132 raeburn 1334: $untiedhash = untie(%hash);
1335: $untiedparmhash = untie(%parmhash);
1336: $gotstate = 1;
1337: last;
1338: }
1339: $untiedparmhash = untie(%parmhash);
1340: }
1341: $untiedhash = untie(%hash);
1342: }
1343: }
1.87 albertel 1344: }
1.132 raeburn 1345: if ($lock) {
1346: flock(LOCKFILE,LOCK_UN);
1.133 raeburn 1347: $lock = 0;
1.132 raeburn 1348: if ($tiedparmhash) {
1349: unless ($untiedparmhash) {
1350: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1351: 'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
1352: }
1353: }
1354: if ($tiedparmhash) {
1355: unless ($untiedhash) {
1356: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1357: 'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
1358: }
1359: }
1360: }
1361: }
1.138 foxr 1362: # I think this branch of code is all about what happens if we just did the stuff above,
1363: # but found that the state file did not exist...again if we'd just held the lock
1364: # would that have made this logic simpler..as generating all the files would be
1365: # an atomic operation with respect to the lock.
1366: #
1.132 raeburn 1367: unless ($gotstate) {
1.133 raeburn 1368: $lock = 0;
1.132 raeburn 1369: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1370: 'Could not read statemap '.$fn.' for '.$uri.'.</font>');
1371: &unlink_tmpfiles($fn);
1.133 raeburn 1372: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
1373: $lock=1;
1374: }
1375: undef %randompick;
1.149.2.1 raeburn 1376: undef %randompickseed;
1377: undef %randomorder;
1.149.2.2! raeburn 1378: undef %randomizationcode;
1.133 raeburn 1379: undef %hiddenurl;
1380: undef %encurl;
1.149.2.2! raeburn 1381: undef %rescount;
! 1382: undef %mapcount;
1.144 raeburn 1383: $errtext='';
1.133 raeburn 1384: $retfrid='';
1.138 foxr 1385: #
1386: # Once more through the routine of tying and loading and so on.
1387: #
1.133 raeburn 1388: if ($lock) {
1389: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
1390: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
1.138 foxr 1391: $gotstate = &build_tmp_hashes($uri,$fn,$short,\%cenv); # TODO: User dependent?
1.133 raeburn 1392: unless ($gotstate) {
1.132 raeburn 1393: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.133 raeburn 1394: 'Failed to write statemap at second attempt '.$fn.' for '.$uri.'.</font>');
1.132 raeburn 1395: }
1.133 raeburn 1396: unless (untie(%parmhash)) {
1.132 raeburn 1397: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.133 raeburn 1398: 'Could not untie coursemap parmhash '.$fn.'.db for '.$uri.'.</font>');
1.132 raeburn 1399: }
1.133 raeburn 1400: } else {
1401: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1402: 'Could not tie coursemap '.$fn.'__parms.db for '.$uri.'.</font>');
1403: }
1404: unless (untie(%hash)) {
1405: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1406: 'Could not untie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
1407: }
1.132 raeburn 1408: } else {
1.133 raeburn 1409: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1410: 'Could not tie coursemap '.$fn.'.db for '.$uri.'.</font>');
1.132 raeburn 1411: }
1.133 raeburn 1412: flock(LOCKFILE,LOCK_UN);
1413: $lock = 0;
1414: } else {
1.138 foxr 1415: # Failed to get the immediate lock.
1416:
1.133 raeburn 1417: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1418: 'Could not obtain lock to tie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
1.132 raeburn 1419: }
1420: }
1.133 raeburn 1421: close(LOCKFILE);
1.132 raeburn 1422: unless (($errtext eq '') || ($env{'request.course.uri'} =~ m{^/uploaded/})) {
1423: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},
1.138 foxr 1424: $errtext); # TODO: User dependent?
1.1 www 1425: }
1.46 www 1426: # ------------------------------------------------- Check for critical messages
1427:
1.138 foxr 1428: # Depends on user must parameterize this as well..or separate as this is:
1429: # more part of determining what someone sees on entering a course?
1430:
1.89 albertel 1431: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
1432: $env{'user.name'});
1.46 www 1433: if ($what[0]) {
1434: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
1435: $retfurl='/adm/email?critical=display';
1436: }
1437: }
1.85 albertel 1438: return ($retfurl,$errtext);
1.1 www 1439: }
1.15 www 1440:
1.138 foxr 1441: #
1442: # This sub is called when the course hash and the param hash have been tied and
1443: # their lock file is held.
1444: # Parameters:
1445: # $uri - URI that identifies the course.
1446: # $fn - The base path/filename of the files that make up the context
1447: # being built.
1448: # $short - Short course name.
1449: # $cenvref - Reference to the course environment hash returned by
1450: # Apache::lonnet::coursedescription
1451: #
1452: # Assumptions:
1453: # The globals
1454: # %hash, %paramhash are tied to their gdbm files and we hold the lock on them.
1455: #
1.132 raeburn 1456: sub build_tmp_hashes {
1457: my ($uri,$fn,$short,$cenvref) = @_;
1.138 foxr 1458:
1.132 raeburn 1459: unless(ref($cenvref) eq 'HASH') {
1460: return;
1461: }
1462: my %cenv = %{$cenvref};
1463: my $gotstate = 0;
1.138 foxr 1464: %hash=(); # empty the global course and parameter hashes.
1.132 raeburn 1465: %parmhash=();
1.138 foxr 1466: $errtext=''; # No error messages yet.
1.132 raeburn 1467: $pc=0;
1468: &clear_mapalias_count();
1469: &processversionfile(%cenv);
1.140 foxr 1470:
1471: # URI Of the map file.
1472:
1.132 raeburn 1473: my $furi=&Apache::lonnet::clutter($uri);
1.138 foxr 1474: #
1475: # the map staring points.
1476: #
1.132 raeburn 1477: $hash{'src_0.0'}=&versiontrack($furi);
1478: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
1479: $hash{'ids_'.$furi}='0.0';
1480: $hash{'is_map_0.0'}=1;
1.140 foxr 1481:
1482: # Load the map.. note that loadmap may implicitly recurse if the map contains
1483: # sub-maps.
1484:
1485:
1.146 raeburn 1486: &loadmap($uri,'0.0',$short);
1.140 foxr 1487:
1488: # The code below only executes if there is a starting point for the map>
1489: # Q/BUG??? If there is no start resource for the map should that be an error?
1490: #
1491:
1.132 raeburn 1492: if (defined($hash{'map_start_'.$uri})) {
1493: &Apache::lonnet::appenv({"request.course.id" => $short,
1494: "request.course.fn" => $fn,
1.143 raeburn 1495: "request.course.uri" => $uri,
1496: "request.course.tied" => time});
1.132 raeburn 1497: $env{'request.course.id'}=$short;
1498: &traceroute('0',$hash{'map_start_'.$uri},'&');
1499: &accinit($uri,$short,$fn);
1500: &hiddenurls();
1.149.2.2! raeburn 1501: &mapcrumbs();
1.132 raeburn 1502: }
1503: $errtext .= &get_mapalias_errors();
1504: # ------------------------------------------------------- Put versions into src
1505: foreach my $key (keys(%hash)) {
1506: if ($key=~/^src_/) {
1507: $hash{$key}=&putinversion($hash{$key});
1508: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
1509: my ($type, $url) = ($1,$2);
1510: my $value = $hash{$key};
1511: $hash{$type.&putinversion($url)}=$value;
1512: }
1513: }
1514: # ---------------------------------------------------------------- Encrypt URLs
1515: foreach my $id (keys(%encurl)) {
1516: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
1517: $hash{'encrypted_'.$id}=1;
1518: }
1519: # ----------------------------------------------- Close hashes to finally store
1520: # --------------------------------- Routine must pass this point, no early outs
1521: $hash{'first_rid'}=$retfrid;
1522: my ($mapid,$resid)=split(/\./,$retfrid);
1523: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
1524: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
1525: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
1526: if ($hash{'encrypted_'.$retfrid}) {
1527: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
1528: }
1529: $hash{'first_url'}=$retfurl;
1530: # ---------------------------------------------------- Store away initial state
1531: {
1532: my $cfh;
1.149.2.2! raeburn 1533: if (open($cfh,">","$fn.state")) {
1.132 raeburn 1534: print $cfh join("\n",@cond);
1535: $gotstate = 1;
1536: } else {
1537: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
1538: "Could not write statemap $fn for $uri.</font>");
1539: }
1540: }
1541: return $gotstate;
1542: }
1543:
1544: sub unlink_tmpfiles {
1545: my ($fn) = @_;
1.138 foxr 1546: my $file_dir = dirname($fn);
1547:
1.145 raeburn 1548: if ("$file_dir/" eq LONCAPA::tempdir()) {
1.132 raeburn 1549: my @files = qw (.db _symb.db .state _parms.db);
1550: foreach my $file (@files) {
1551: if (-e $fn.$file) {
1552: unless (unlink($fn.$file)) {
1553: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
1554: "Could not unlink ".$fn.$file."</font>");
1555: }
1556: }
1557: }
1558: }
1559: return;
1560: }
1561:
1.15 www 1562: # ------------------------------------------------------- Evaluate state string
1563:
1564: sub evalstate {
1.89 albertel 1565: my $fn=$env{'request.course.fn'}.'.state';
1.80 albertel 1566: my $state='';
1.15 www 1567: if (-e $fn) {
1.80 albertel 1568: my @conditions=();
1569: {
1.149.2.2! raeburn 1570: open(my $fh,"<",$fn);
1.80 albertel 1571: @conditions=<$fh>;
1.115 raeburn 1572: close($fh);
1.80 albertel 1573: }
1574: my $safeeval = new Safe;
1575: my $safehole = new Safe::Hole;
1576: $safeeval->permit("entereval");
1577: $safeeval->permit(":base_math");
1578: $safeeval->deny(":base_io");
1579: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
1580: foreach my $line (@conditions) {
1581: chomp($line);
1582: my ($condition,$weight)=split(/\:/,$line);
1583: if ($safeeval->reval($condition)) {
1584: if ($weight eq 'force') {
1585: $state.='3';
1586: } else {
1587: $state.='2';
1588: }
1589: } else {
1590: if ($weight eq 'stop') {
1591: $state.='0';
1592: } else {
1593: $state.='1';
1594: }
1595: }
1596: }
1.15 www 1597: }
1.128 raeburn 1598: &Apache::lonnet::appenv({'user.state.'.$env{'request.course.id'} => $state});
1.15 www 1599: return $state;
1600: }
1601:
1.138 foxr 1602: # This block seems to have code to manage/detect doubly defined
1603: # aliases in maps.
1604:
1.122 albertel 1605: {
1606: my %mapalias_cache;
1607: sub count_mapalias {
1608: my ($value,$resid) = @_;
1609: push(@{ $mapalias_cache{$value} }, $resid);
1610: }
1611:
1612: sub get_mapalias_errors {
1613: my $error_text;
1614: foreach my $mapalias (sort(keys(%mapalias_cache))) {
1615: next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1);
1616: my $count;
1617: my $which =
1618: join('</li><li>',
1619: map {
1620: my $id = $_;
1621: if (exists($hash{'src_'.$id})) {
1622: $count++;
1623: }
1624: my ($mapid) = split(/\./,$id);
1.147 raeburn 1625: &mt('Resource [_1][_2]in Map [_3]',
1626: $hash{'title_'.$id},'<br />',
1.122 albertel 1627: $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}});
1628: } (@{ $mapalias_cache{$mapalias} }));
1629: next if ($count < 2);
1630: $error_text .= '<div class="LC_error">'.
1631: &mt('Error: Found the mapalias "[_1]" defined multiple times.',
1632: $mapalias).
1633: '</div><ul><li>'.$which.'</li></ul>';
1634: }
1635: &clear_mapalias_count();
1636: return $error_text;
1637: }
1638: sub clear_mapalias_count {
1639: undef(%mapalias_cache);
1640: }
1641: }
1.1 www 1642: 1;
1643: __END__
1644:
1.26 harris41 1645: =head1 NAME
1646:
1647: Apache::lonuserstate - Construct and maintain state and binary representation
1648: of course for user
1649:
1650: =head1 SYNOPSIS
1651:
1652: Invoked by lonroles.pm.
1653:
1654: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
1655:
1656: =head1 INTRODUCTION
1657:
1658: This module constructs and maintains state and binary representation
1659: of course for user.
1660:
1661: This is part of the LearningOnline Network with CAPA project
1662: described at http://www.lon-capa.org.
1663:
1.129 jms 1664: =head1 SUBROUTINES
1.26 harris41 1665:
1.129 jms 1666: =over
1.26 harris41 1667:
1.129 jms 1668: =item loadmap()
1.26 harris41 1669:
1.129 jms 1670: Loads map from disk
1.26 harris41 1671:
1.129 jms 1672: =item simplify()
1.26 harris41 1673:
1.129 jms 1674: Simplify expression
1.26 harris41 1675:
1.129 jms 1676: =item traceroute()
1.26 harris41 1677:
1.129 jms 1678: Build condition hash
1.26 harris41 1679:
1.129 jms 1680: =item accinit()
1.26 harris41 1681:
1.129 jms 1682: Cascading conditions, quick access, parameters
1.26 harris41 1683:
1.129 jms 1684: =item readmap()
1.26 harris41 1685:
1.129 jms 1686: Read map and all submaps
1.1 www 1687:
1.129 jms 1688: =item evalstate()
1.1 www 1689:
1.129 jms 1690: Evaluate state string
1.1 www 1691:
1.26 harris41 1692: =back
1.1 www 1693:
1.26 harris41 1694: =cut
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