1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.149.2.6 2024/07/03 02:16:44 raeburn Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonuserstate;
31:
32: # ------------------------------------------------- modules used by this module
33: use strict;
34: use HTML::TokeParser;
35: use Apache::lonnet;
36: use Apache::lonlocal;
37: use Apache::loncommon();
38: use GDBM_File;
39: use Apache::lonmsg;
40: use Safe;
41: use Safe::Hole;
42: use Opcode;
43: use Apache::lonenc;
44: use Fcntl qw(:flock);
45: use LONCAPA qw(:DEFAULT :match);
46: use File::Basename;
47:
48:
49:
50: # ---------------------------------------------------- Globals for this package
51:
52: my $pc; # Package counter is this what 'Guts' calls the map counter?
53: my %hash; # The big tied hash
54: my %parmhash;# The hash with the parameters
55: my @cond; # Array with all of the conditions
56: my $errtext; # variable with all errors
57: my $retfrid; # variable with the very first RID in the course
58: my $retfurl; # first URL
59: my %randompick; # randomly picked resources
60: my %randompickseed; # optional seed for randomly picking resources
61: my %randomorder; # maps to order contents randomly
62: my %randomizationcode; # code used to grade folder for bubblesheet exam
63: my %encurl; # URLs in this folder are supposed to be encrypted
64: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
65: my %rescount; # count of unhidden items in each map
66: my %mapcount; # count of unhidden maps in each map
67:
68: # ----------------------------------- Remove version from URL and store in hash
69:
70: sub versionerror {
71: my ($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:
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:
91: sub versiontrack {
92: my $uri=shift;
93: if ($uri=~/\.(\d+)\.\w+$/) {
94: my $version=$1;
95: $uri=~s/\.\d+\.(\w+)$/\.$1/;
96: unless ($hash{'version_'.$uri}) {
97: $hash{'version_'.$uri}=$version;
98: } elsif ($version!=$hash{'version_'.$uri}) {
99: $errtext.=&versionerror($uri,$hash{'version_'.$uri},$version);
100: }
101: }
102: return $uri;
103: }
104:
105: # -------------------------------------------------------------- Put in version
106:
107: sub putinversion {
108: my $uri=shift;
109: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
110: if ($hash{'version_'.$uri}) {
111: my $version=$hash{'version_'.$uri};
112: if ($version eq 'mostrecent') { return $uri; }
113: if ($version eq &Apache::lonnet::getversion(
114: &Apache::lonnet::filelocation('',$uri)))
115: { return $uri; }
116: $uri=~s/\.(\w+)$/\.$version\.$1/;
117: }
118: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
119: return $uri;
120: }
121:
122: # ----------------------------------------- Processing versions file for course
123:
124: sub processversionfile {
125: my %cenv=@_;
126: my %versions=&Apache::lonnet::dump('resourceversions',
127: $cenv{'domain'},
128: $cenv{'num'});
129: foreach my $ver (keys(%versions)) {
130: if ($ver=~/^error\:/) { return; }
131: $hash{'version_'.$ver}=$versions{$ver};
132: }
133: }
134:
135: # --------------------------------------------------------- Loads from disk
136:
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)
146: # courseid - Course id for the course for which the map is being loaded
147: #
148: sub loadmap {
149: my ($uri,$parent_rid,$courseid)=@_;
150:
151: # Is the map already included?
152:
153: if ($hash{'map_pc_'.$uri}) {
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>';
157: return;
158: }
159: # Register the resource in it's map_pc_ [for the URL]
160: # map_id.nnn is the nesting level -> to the URI.
161:
162: $pc++;
163: my $lpc=$pc;
164: $hash{'map_pc_'.$uri}=$lpc;
165: $hash{'map_id_'.$lpc}=$uri;
166:
167: # If the parent is of the form n.m hang this map underneath it in the
168: # map hierarchy.
169:
170: if ($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: }
179:
180: # Determine and check filename of the sequence we need to read:
181:
182: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
183:
184: my $ispage=($fn=~/\.page$/);
185:
186: # We can only nest sequences or pages. Anything else is an illegal nest.
187:
188: unless (($fn=~/\.sequence$/) || $ispage) {
189: $errtext.='<br />'.&mt('Invalid map: [_1]',"<tt>$fn</tt>");
190: return;
191: }
192:
193: # Read the XML that constitutes the file.
194:
195: my $instr=&Apache::lonnet::getfile($fn);
196:
197: if ($instr eq -1) {
198: $errtext.= '<br />'
199: .&mt('Map not loaded: The file [_1] does not exist.',
200: "<tt>$fn</tt>");
201: $hash{'map_type_'.$lpc}='none';
202: if (&is_advanced($courseid)) {
203: $errtext .= &error_detail($parent_rid,$courseid,$ispage,$uri);
204: }
205: return;
206: }
207:
208: # Successfully got file, parse it
209:
210: # parse for parameter processing.
211: # Note that these are <param... / > tags
212: # so we only care about 'S' (tag start) nodes.
213:
214:
215: my $parser = HTML::TokeParser->new(\$instr);
216: $parser->attr_encoded(1);
217:
218: # first get all parameters
219:
220:
221: while (my $token = $parser->get_token) {
222: next if ($token->[0] ne 'S');
223: if ($token->[1] eq 'param') {
224: &parse_param($token,$lpc);
225: }
226: }
227:
228: # Get set to take another pass through the XML:
229: # for resources and links.
230:
231: $parser = HTML::TokeParser->new(\$instr);
232: $parser->attr_encoded(1);
233:
234: my $linkpc=0;
235:
236: $fn=~/\.(\w+)$/;
237:
238: $hash{'map_type_'.$lpc}=$1;
239:
240: my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i);
241:
242: # Parse the resources, link and condition tags.
243: # Note that if randomorder or random select is chosen the links and
244: # conditions are meaningless but are determined by the randomization.
245: # This is handled in the next chunk of code.
246:
247: my @map_ids;
248: my $codechecked;
249: $rescount{$lpc} = 0;
250: $mapcount{$lpc} = 0;
251: while (my $token = $parser->get_token) {
252: next if ($token->[0] ne 'S');
253:
254: # Resource
255:
256: if ($token->[1] eq 'resource') {
257: my $resource_id = &parse_resource($token,$lpc,$ispage,$uri,$courseid);
258: if (defined $resource_id) {
259: push(@map_ids, $resource_id);
260: if ($hash{'src_'.$lpc.'.'.$resource_id}) {
261: $rescount{$lpc} ++;
262: if (($hash{'src_'.$lpc.'.'.$resource_id}=~/\.sequence$/) ||
263: ($hash{'src_'.$lpc.'.'.$resource_id}=~/\.page$/)) {
264: $mapcount{$lpc} ++;
265: }
266: }
267: unless ($codechecked) {
268: my $startsymb =
269: &Apache::lonnet::encode_symb($hash{'map_id_'.$lpc},$resource_id,
270: $hash{'src_'."$lpc.$resource_id"});
271: my $code =
272: &Apache::lonnet::EXT('resource.0.examcode',$startsymb,undef,undef,
273: undef,undef,$courseid);
274: if ($code) {
275: $randomizationcode{$parent_rid} = $code;
276: }
277: $codechecked = 1;
278: }
279: }
280:
281: # Link
282:
283: } elsif ($token->[1] eq 'link' && !$randomize) {
284: &make_link(++$linkpc,$lpc,$token->[2]->{'to'},
285: $token->[2]->{'from'},
286: $token->[2]->{'condition'}); # note ..condition may be undefined.
287:
288: # condition
289:
290: } elsif ($token->[1] eq 'condition' && !$randomize) {
291: &parse_condition($token,$lpc);
292: }
293: }
294: undef($codechecked);
295:
296: # Handle randomization and random selection
297:
298: if ($randomize) {
299: unless (&is_advanced($courseid)) {
300: # Order of resources is not randomized if user has and advanced role in the course.
301: my $seed;
302:
303: # If the map's random seed parameter has been specified
304: # it is used as the basis for computing the seed ...
305:
306: if (defined($randompickseed{$parent_rid})) {
307: $seed = $randompickseed{$parent_rid};
308: } else {
309:
310: # Otherwise the parent's fully encoded symb is used.
311:
312: my ($mapid,$resid)=split(/\./,$parent_rid);
313: my $symb=
314: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
315: $resid,$hash{'src_'.$parent_rid});
316:
317: $seed = $symb;
318: }
319:
320: # TODO: Here for sure we need to pass along the username/domain
321: # so that we can impersonate users in lonprintout e.g.
322:
323: my $setcode;
324: if (defined($randomizationcode{$parent_rid})) {
325: if ($env{'form.CODE'} eq '') {
326: $env{'form.CODE'} = $randomizationcode{$parent_rid};
327: $setcode = 1;
328: }
329: }
330:
331: my $rndseed=&Apache::lonnet::rndseed($seed);
332: &Apache::lonnet::setup_random_from_rndseed($rndseed);
333:
334: if ($setcode) {
335: undef($env{'form.CODE'});
336: undef($setcode);
337: }
338:
339: # Take the set of map ids we have decoded and permute them to a
340: # random order based on the seed set above. All of this is
341: # processing the randomorder parameter if it is set, not
342: # randompick.
343:
344: @map_ids=&Math::Random::random_permutation(@map_ids);
345: }
346:
347: my $from = shift(@map_ids);
348: my $from_rid = $lpc.'.'.$from;
349: $hash{'map_start_'.$uri} = $from_rid;
350: $hash{'type_'.$from_rid}='start';
351:
352: # Create links to reflect the random re-ordering done above.
353: # In the code to process the map XML, we did not process links or conditions
354: # if randomorder was set. This means that for an instructor to choose
355:
356: while (my $to = shift(@map_ids)) {
357: &make_link(++$linkpc,$lpc,$to,$from);
358: my $to_rid = $lpc.'.'.$to;
359: $hash{'type_'.$to_rid}='normal';
360: $from = $to;
361: $from_rid = $to_rid;
362: }
363:
364: $hash{'map_finish_'.$uri}= $from_rid;
365: $hash{'type_'.$from_rid}='finish';
366: }
367:
368: $parser = HTML::TokeParser->new(\$instr);
369: $parser->attr_encoded(1);
370:
371: # last parse out the mapalias params. These provide mnemonic
372: # tags to resources that can be used in conditions
373:
374: while (my $token = $parser->get_token) {
375: next if ($token->[0] ne 'S');
376: if ($token->[1] eq 'param') {
377: &parse_mapalias_param($token,$lpc);
378: }
379: }
380: }
381:
382: sub is_advanced {
383: my ($courseid) = @_;
384: my $advanced;
385: if ($env{'request.course.id'}) {
386: $advanced = (&Apache::lonnet::allowed('adv') eq 'F');
387: } else {
388: $env{'request.course.id'} = $courseid;
389: $advanced = (&Apache::lonnet::allowed('adv') eq 'F');
390: $env{'request.course.id'} = '';
391: }
392: return $advanced;
393: }
394:
395: sub error_detail {
396: my ($parent_rid,$courseid,$ispage,$uri) = @_;
397: my $errinfo;
398: if ($courseid) {
399: my $courseurl = &Apache::lonnet::courseid_to_courseurl($courseid);
400: if ($parent_rid =~ /^(\d+)\.(\d+)$/) {
401: my ($parent_pc,$parent_id) = ($1,$2);
402: my ($parent_type,$published,$uploaded,$canedit,$role,$switchserver,$audom,$auname,
403: $editfile,$filerole,$fileswitch,$audomfile,$aunamefile);
404: if (($parent_pc eq '0') && ($hash{'map_id_1'} =~ m{^/res/($match_domain)/($match_username)/.+\.(sequence|page)$})) {
405: ($audomfile,$aunamefile) = ($1,$2);
406: ($editfile,$filerole,$fileswitch) = &canedit_published($audomfile,$aunamefile);
407: $errinfo = &mt('Top level published sequence file is missing.');
408: } else {
409: if ($parent_pc eq '1') {
410: if ($hash{'map_id_1'} eq "/uploaded$courseurl/default.sequence") {
411: $uploaded = 1;
412: if (&Apache::lonnet::allowed('mdc',$courseid)) {
413: $canedit = 1;
414: }
415: $errinfo = &mt('Map is referenced in the top level ([_1]Main Content[_2]) folder.',
416: '<span class="LC_cusr_emph">','</span>');
417: } elsif ($hash{'map_id_1'} =~ m{^/res/($match_domain)/($match_username)/.+\.(sequence|page)$}) {
418: ($audom,$auname) = ($1,$2);
419: ($canedit,$role,$switchserver) = &canedit_published($audom,$auname);
420: $published = 1;
421: $errinfo = &mt('Map is referenced in the top level published sequence file.');
422: }
423: } else {
424: if ($hash{'map_id_'.$parent_pc} =~ m{^\Q/uploaded$courseurl/default_\E\d+\.(sequence|page)$}) {
425: $uploaded = 1;
426: if (&Apache::lonnet::allowed('mdc',$courseid)) {
427: $canedit = 1;
428: }
429: } elsif ($hash{'map_id_'.$parent_pc} =~ m{^/res/($match_domain)/($match_username)/.+\.(sequence|page)$}) {
430: ($audom,$auname) = ($1,$2);
431: ($canedit,$role,$switchserver) = &canedit_published($audom,$auname);
432: $published = 1;
433: }
434: if (exists($hash{'ids_'.$hash{'map_id_'.$parent_pc}})) {
435: $parent_type = $hash{'map_type_'.$parent_pc};
436: if ($published) {
437: $errinfo = &mt("Map is referenced in the published $parent_type file: [_1].",
438: '<span class="LC_cusr_emph">'.$hash{'map_id_'.$parent_pc}.'</span>');
439: } else {
440: my $title = $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$parent_pc}}};
441: if ($title ne '') {
442: my $mapdesc;
443: if ($parent_type eq 'sequence') {
444: $mapdesc = 'folder';
445: } else {
446: $mapdesc = 'composite page';
447: }
448: $errinfo = &mt("Map is referenced in the $mapdesc named: [_1].",
449: '<span class="LC_cusr_emph">'.$title.'</span>');
450: }
451: my @containers = split(/,/,$hash{'map_hierarchy_'.$parent_pc});
452: shift(@containers);
453: my $folderpath;
454: foreach my $id (@containers) {
455: my $name;
456: if ($id == 1) {
457: $name = &mt('Main Content');
458: } elsif ($hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$id}}} ne '') {
459: $name = $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$id}}};
460: }
461: if ($name ne '') {
462: $folderpath .= $name.' » ';
463: }
464: }
465: if ($title eq '') {
466: $folderpath =~ s/\Q » \E$//;
467: } else {
468: $folderpath .= $title;
469: }
470: if ($folderpath) {
471: $errinfo .= '<br />'.&mt('Hierarchy is: [_1]',
472: '<span class="LC_cusr_emph">'.$folderpath.'</span>');
473: }
474: }
475: }
476: }
477: if ($uri =~ m{^/res/($match_domain)/($match_username)/.+\.(sequence|page)$}) {
478: ($audomfile,$aunamefile) = ($1,$2);
479: ($editfile,$filerole,$fileswitch) = &canedit_published($audomfile,$aunamefile);
480: }
481: }
482: if ($errinfo) {
483: $errinfo = '<br />'.$errinfo.'<br />';
484: }
485: if ($editfile) {
486: if ($errinfo ne '') {
487: $errinfo .= '<br />';
488: }
489: if ($canedit) {
490: $errinfo .= &mt('One way to rectify this problem is to create and publish the missing file');
491: } else {
492: $errinfo .= &mt('To rectify this problem, create and publish the missing file');
493: }
494: my $fileurl = $uri;
495: $fileurl =~s{^/res/}{/priv/};
496: if ($fileswitch) {
497: my $rolename = &Apache::lonnet::plaintext($filerole);
498: my $rolecode;
499: if ($filerole eq 'au') {
500: $rolecode = 'au./'.$audomfile.'/';
501: } else {
502: $rolecode = $filerole.'./'.$audomfile.'/'.$aunamefile;
503: }
504: $errinfo .= '.<br />'.&mt('You will need to [_1]switch server[_2].',
505: '<a href="/adm/switchserver?otherserver='.$switchserver.'&role='.$rolecode.
506: '&origurl='.&escape($fileurl).'">','</a>');
507: } else {
508: &js_escape(\$fileurl);
509: $errinfo .= ': <a href="javascript:go('."'$fileurl'".');">'.&mt('Create the missing file').'</a>';
510: }
511: }
512: if ($canedit) {
513: if ($errinfo ne '') {
514: $errinfo .= '<br />';
515: }
516: if ($published) {
517: my $rolename = &Apache::lonnet::plaintext($role);
518: my $rolecode;
519: if ($role eq 'au') {
520: $rolecode = 'au./'.$audom.'/';
521: } else {
522: $rolecode = $role.'./'.$audom.'/'.$auname;
523: }
524: if ($editfile) {
525: $errinfo .= &mt('Another way is to edit the parent map to remove the reference to the missing file');
526: } else {
527: $errinfo .= &mt('To rectify this problem edit the parent map to remove the reference to the missing file');
528: }
529: my $mapurl = $hash{'map_id_'.$parent_pc};
530: $mapurl =~s{^/res/}{/priv/};
531: if ($switchserver) {
532: $errinfo .= '.<br />'.
533: &mt('You will need to [_1]switch server[_2].',
534: '<a href="/adm/switchserver?otherserver='.$switchserver.'&role='.$rolecode.
535: '&origurl='.&escape($mapurl).'">','</a>');
536: } else {
537: &js_escape(\$mapurl);
538: $errinfo .= ': <a href="javascript:go('."'$mapurl'".');">'.&mt('Edit the map').'</a>';
539: }
540: } elsif ($uploaded && $courseid) {
541: my ($dest,$linktext);
542: my $crstype = &Apache::loncommon::course_type($courseid);
543: if ($parent_pc eq '1') {
544: $dest = '/adm/coursedocs?folderpath='.&escape('default&Main%20Content:::::');
545: $linktext = &mt('Edit Folder');
546: } elsif ($hash{'ids_'.$hash{'map_id_'.$parent_pc}} =~ /^(\d+)\.(\d+)$/) {
547: my ($editmap,$editidx) = ($1,$2);
548: my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$editmap},
549: $editidx,$hash{'map_id_'.$parent_pc});
550: $dest = '/adm/coursedocs?command=directnav&symb='.&escape($symb);
551: if ($parent_type eq 'sequence') {
552: $linktext = &mt('Edit Folder');
553: } else {
554: $linktext = &mt('Edit Composite Page');
555: }
556: } else {
557: $dest = '/adm/coursedocs?folderpath='.&escape('default&Main%20Content:::::');
558: $linktext = &mt("Edit $crstype");
559: }
560: if ($editfile) {
561: $errinfo .= &mt("Another way is to use the $crstype Editor to delete the reference to the missing file");
562: } else {
563: $errinfo .= &mt("To rectify this problem use the $crstype Editor to delete the reference to the missing file");
564: }
565: $errinfo .= ': <a href="javascript:go('."'$dest'".');">'.$linktext.'</a>';
566: }
567: $errinfo .= '<br />';
568: }
569: }
570: }
571: return $errinfo;
572: }
573:
574: sub canedit_published {
575: my ($audom,$auname) = @_;
576: my ($canedit,$role,$switchserver);
577: my $now = time;
578: if (($auname eq $env{'user.name'}) && ($audom eq $env{'user.domain'})) {
579: if (exists($env{"user.role.au./$audom/"})) {
580: my ($start,$end) = split(/\./,$env{"user.role.au./$audom/"});
581: unless (($end && $end < $now) || ($start && $start > $now)) {
582: $canedit = 1;
583: $role = 'au';
584: }
585: }
586: }
587: unless ($canedit) {
588: foreach my $possrole ('ca','aa') {
589: if (exists($env{"user.role.$possrole./$audom/$auname"})) {
590: my ($end,$start) = split(/\./,$env{"user.role.$possrole./$audom/$auname"});
591: unless (($end && $end < time) || ($start && $start > time)) {
592: $canedit = 1;
593: $role = $possrole;
594: last;
595: }
596: }
597: }
598: }
599: if ($canedit) {
600: my $auhome = &Apache::lonnet::homeserver($auname,$audom);
601: my @ids=&Apache::lonnet::current_machine_ids();
602: if (($auhome ne 'no_host') && (!grep(/^\Q$auhome\E$/,@ids))) {
603: $switchserver = $auhome;
604: }
605: }
606: return ($canedit,$role,$switchserver);
607: }
608:
609: # -------------------------------------------------------------------- Resource
610: #
611: # Parses a resource tag to produce the value to push into the
612: # map_ids array.
613: #
614: #
615: # Information about the actual type of resource is provided by the file extension
616: # of the uri (e.g. .problem, .sequence etc. etc.).
617: #
618: # Parameters:
619: # $token - A token from HTML::TokeParser
620: # This is an array that describes the most recently parsed HTML item.
621: # $lpc - Map nesting level (?)
622: # $ispage - True if this resource is encapsulated in a .page (assembled resourcde).
623: # $uri - URI of the enclosing resource.
624: # $courseid - Course id of the course containing the resource being parsed.
625: # Returns:
626: # Value of the id attribute of the tag.
627: #
628: # Note:
629: # The token is an array that contains the following elements:
630: # [0] => 'S' indicating this is a start token
631: # [1] => 'resource' indicating this tag is a <resource> tag.
632: # [2] => Hash of attribute =>value pairs.
633: # [3] => @(keys [2]).
634: # [4] => unused.
635: #
636: # The attributes of the resourcde tag include:
637: #
638: # id - The resource id.
639: # src - The URI of the resource.
640: # type - The resource type (e.g. start and finish).
641: # title - The resource title.
642:
643:
644: sub parse_resource {
645: my ($token,$lpc,$ispage,$uri,$courseid) = @_;
646:
647: # I refuse to countenance code like this that has
648: # such a dirty side effect (and forcing this sub to be called within a loop).
649: #
650: # if ($token->[2]->{'type'} eq 'zombie') { next; }
651: #
652: # The original code both returns _and_ skips to the next pass of the >caller's<
653: # loop, that's just dirty.
654: #
655:
656: # Zombie resources don't produce anything useful.
657:
658: if ($token->[2]->{'type'} eq 'zombie') {
659: return undef;
660: }
661:
662: my $rid=$lpc.'.'.$token->[2]->{'id'}; # Resource id in hash is levelcounter.id-in-xml.
663:
664: # Save the hash element type and title:
665:
666: $hash{'kind_'.$rid}='res';
667: $hash{'title_'.$rid}=$token->[2]->{'title'};
668:
669: # Get the version free URI for the resource.
670: # If a 'version' attribute was supplied, and this resource's version
671: # information has not yet been stored, store it.
672: #
673:
674: my $turi=&versiontrack($token->[2]->{'src'});
675: if ($token->[2]->{'version'}) {
676: unless ($hash{'version_'.$turi}) {
677: $hash{'version_'.$turi}=$1;
678: }
679: }
680: # Pull out the title and do entity substitution on &colon
681: # Q: Why no other entity substitutions?
682:
683: my $title=$token->[2]->{'title'};
684: $title=~s/\&colon\;/\:/gs;
685:
686:
687:
688: # I think the point of all this code is to construct a final
689: # URI that apache and its rewrite rules can use to
690: # fetch the resource. Thi s sonly necessary if the resource
691: # is not a page. If the resource is a page then it must be
692: # assembled (at fetch time?).
693:
694: if ($ispage) {
695: if ($token->[2]->{'external'} eq 'true') { # external
696: $turi=~s{^http\://}{/ext/};
697: }
698: } else {
699: $turi=~/\.(\w+)$/;
700: my $embstyle=&Apache::loncommon::fileembstyle($1);
701: if ($token->[2]->{'external'} eq 'true') { # external
702: $turi=~s/^https?\:\/\//\/adm\/wrapper\/ext\//;
703: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
704: if (($embstyle eq 'img')
705: || ($embstyle eq 'emb')
706: || ($embstyle eq 'wrp')) {
707: $turi='/adm/wrapper'.$turi;
708: } elsif ($embstyle eq 'ssi') {
709: #do nothing with these
710: } elsif ($turi!~/\.(sequence|page)$/) {
711: $turi='/adm/coursedocs/showdoc'.$turi;
712: }
713: } elsif ($turi=~/\S/) { # normal non-empty internal resource
714: my $mapdir=$uri;
715: $mapdir=~s/[^\/]+$//;
716: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
717: if (($embstyle eq 'img')
718: || ($embstyle eq 'emb')
719: || ($embstyle eq 'wrp')) {
720: $turi='/adm/wrapper'.$turi;
721: }
722: }
723: }
724: # Store reverse lookup, remove query string resource 'ids'_uri => resource id.
725: # If the URI appears more than one time in the sequence, it's resourcde
726: # id's are constructed as a comma spearated list.
727:
728: my $idsuri=$turi;
729: $idsuri=~s/\?.+$//;
730: if (defined($hash{'ids_'.$idsuri})) {
731: $hash{'ids_'.$idsuri}.=','.$rid;
732: } else {
733: $hash{'ids_'.$idsuri}=''.$rid;
734: }
735:
736:
737:
738: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard|viewclasslist)$/) {
739: $turi.='?register=1';
740: }
741:
742:
743: # resource id lookup: 'src'_resourc-di => URI decorated with a query
744: # parameter as above if necessary due to the resource type.
745:
746: $hash{'src_'.$rid}=$turi;
747:
748: # Mark the external-ness of the resource:
749:
750: if ($token->[2]->{'external'} eq 'true') {
751: $hash{'ext_'.$rid}='true:';
752: } else {
753: $hash{'ext_'.$rid}='false:';
754: }
755:
756: # If the resource is a start/finish resource set those
757: # entries in the has so that navigation knows where everything starts.
758: # TODO? If there is a malformed sequence that has no start or no finish
759: # resource, should this be detected and errors thrown? How would such a
760: # resource come into being other than being manually constructed by a person
761: # and then uploaded? Could that happen if an author decided a sequence was almost
762: # right edited it by hand and then reuploaded it to 'fix it' but accidently cut the
763: # start or finish resources?
764: #
765: # All resourcess also get a type_id => (start | finish | normal) hash entr.
766: #
767: if ($token->[2]->{'type'}) {
768: $hash{'type_'.$rid}=$token->[2]->{'type'};
769: if ($token->[2]->{'type'} eq 'start') {
770: $hash{'map_start_'.$uri}="$rid";
771: }
772: if ($token->[2]->{'type'} eq 'finish') {
773: $hash{'map_finish_'.$uri}="$rid";
774: }
775: } else {
776: $hash{'type_'.$rid}='normal';
777: }
778:
779: # Sequences end pages are constructed entities. They require that the
780: # map that defines _them_ be loaded as well into the hash...with this resourcde
781: # as the base of the nesting.
782: # Resources like that are also marked with is_map_id => 1 entries.
783: #
784:
785: if (($turi=~/\.sequence$/) ||
786: ($turi=~/\.page$/)) {
787: $hash{'is_map_'.$rid}=1;
788: if ((!$hiddenurl{$rid}) || (&is_advanced($courseid))) {
789: &loadmap($turi,$rid,$courseid);
790: }
791: }
792: return $token->[2]->{'id'};
793: }
794:
795: #-------------------------------------------------------------------- link
796: # Links define how you are allowed to move from one resource to another.
797: # They are the transition edges in the directed graph that a map is.
798: # This sub takes informatino from a <link> tag and constructs the
799: # navigation bits and pieces of a map. There is no requirement that the
800: # resources that are linke are already defined, however clearly the map is
801: # badly broken if they are not _eventually_ defined.
802: #
803: # Note that links can be unconditional or conditional.
804: #
805: # Parameters:
806: # linkpc - The link counter for this level of map nesting (this is
807: # reset to zero by loadmap prior to starting to process
808: # links for map).
809: # lpc - The map level ocounter (how deeply nested this map is in
810: # the hierarchy of maps that are recursively read in.
811: # to - resource id (within the XML) of the target of the edge.
812: # from - resource id (within the XML) of the source of the edge.
813: # condition- id of condition associated with the edge (also within the XML).
814: #
815:
816: sub make_link {
817: my ($linkpc,$lpc,$to,$from,$condition) = @_;
818:
819: # Compute fully qualified ids for the link, the
820: # and from/to by prepending lpc.
821: #
822:
823: my $linkid=$lpc.'.'.$linkpc;
824: my $goesto=$lpc.'.'.$to;
825: my $comesfrom=$lpc.'.'.$from;
826: my $undercond=0;
827:
828:
829: # If there is a condition, qualify it with the level counter.
830:
831: if ($condition) {
832: $undercond=$lpc.'.'.$condition;
833: }
834:
835: # Links are represnted by:
836: # goesto_.fuullyqualifedlinkid => fully qualified to
837: # comesfrom.fullyqualifiedlinkid => fully qualified from
838: # undercond_.fullyqualifiedlinkid => fully qualified condition id.
839:
840: $hash{'goesto_'.$linkid}=$goesto;
841: $hash{'comesfrom_'.$linkid}=$comesfrom;
842: $hash{'undercond_'.$linkid}=$undercond;
843:
844: # In addition:
845: # to_.fully qualified from => comma separated list of
846: # link ids with that from.
847: # Similarly:
848: # from_.fully qualified to => comma separated list of link ids`
849: # with that to.
850: # That allows us given a resource id to know all edges that go to it
851: # and leave from it.
852: #
853:
854: if (defined($hash{'to_'.$comesfrom})) {
855: $hash{'to_'.$comesfrom}.=','.$linkid;
856: } else {
857: $hash{'to_'.$comesfrom}=''.$linkid;
858: }
859: if (defined($hash{'from_'.$goesto})) {
860: $hash{'from_'.$goesto}.=','.$linkid;
861: } else {
862: $hash{'from_'.$goesto}=''.$linkid;
863: }
864: }
865:
866: # ------------------------------------------------------------------- Condition
867: #
868: # Processes <condition> tags, storing sufficient information about them
869: # in the hash so that they can be evaluated and used to conditionalize
870: # what is presented to the student.
871: #
872: # these can have the following attributes
873: #
874: # id = A unique identifier of the condition within the map.
875: #
876: # value = Is a perl script-let that, when evaluated in safe space
877: # determines whether or not the condition is true.
878: # Normally this takes the form of a test on an Apache::lonnet::EXT call
879: # to find the value of variable associated with a resource in the
880: # map identified by a mapalias.
881: # Here's a fragment of XML code that illustrates this:
882: #
883: # <param to="5" value="mainproblem" name="parameter_0_mapalias" type="string" />
884: # <resource src="" id="1" type="start" title="Start" />
885: # <resource src="/res/msu/albertel/b_and_c/p1.problem" id="5" title="p1.problem" />
886: # <condition value="&EXT('user.resource.resource.0.tries','mainproblem')
887: # <2 " id="61" type="stop" />
888: # <link to="5" index="1" from="1" condition="61" />
889: #
890: # In this fragment:
891: # - The param tag establishes an alias to resource id 5 of 'mainproblem'.
892: # - The resource that is the start of the map is identified.
893: # - The resource tag identifies the resource associated with this tag
894: # and gives it the id 5.
895: # - The condition is true if the tries variable associated with mainproblem
896: # is less than 2 (that is the user has had more than 2 tries).
897: # The condition type is a stop condition which inhibits(?) the associated
898: # link if the condition is false.
899: # - The link to resource 5 from resource 1 is affected by this condition.
900: #
901: # type = Type of the condition. The type determines how the condition affects the
902: # link associated with it and is one of
903: # - 'force'
904: # - 'stop'
905: # anything else including not supplied..which treated as:
906: # - 'normal'.
907: # Presumably maps get created by the resource assembly tool and therefore
908: # illegal type values won't squirm their way into the XML.
909: #
910: # Side effects:
911: # - The kind_level-qualified-condition-id hash element is set to 'cond'.
912: # - The condition text is pushed into the cond array and its element number is
913: # set in the condid_level-qualified-condition-id element of the hash.
914: # - The condition type is colon appneded to the cond array element for this condition.
915: sub parse_condition {
916: my ($token,$lpc) = @_;
917: my $rid=$lpc.'.'.$token->[2]->{'id'};
918:
919: $hash{'kind_'.$rid}='cond';
920:
921: my $condition = $token->[2]->{'value'};
922: $condition =~ s/[\n\r]+/ /gs;
923: push(@cond, $condition);
924: $hash{'condid_'.$rid}=$#cond;
925: if ($token->[2]->{'type'}) {
926: $cond[$#cond].=':'.$token->[2]->{'type'};
927: } else {
928: $cond[$#cond].=':normal';
929: }
930: }
931:
932: # ------------------------------------------------------------------- Parameter
933: # Parse a <parameter> tag in the map.
934: # Parmameters:
935: # $token Token array for a start tag from HTML::TokeParser
936: # [0] = 'S'
937: # [1] = tagname ("param")
938: # [2] = Hash of {attribute} = values.
939: # [3] = Array of the keys in [2].
940: # [4] = unused.
941: # $lpc Current map nesting level.a
942: #
943: # Typical attributes:
944: # to=n - Number of the resource the parameter applies to.
945: # type=xx - Type of parameter value (e.g. string_yesno or int_pos).
946: # name=xxx - Name of parameter (e.g. parameter_randompick or parameter_randomorder).
947: # value=xxx - value of the parameter.
948:
949: sub parse_param {
950: my ($token,$lpc) = @_;
951: my $referid=$lpc.'.'.$token->[2]->{'to'}; # Resource param applies to.
952: my $name=$token->[2]->{'name'}; # Name of parameter
953: my $part;
954:
955:
956: if ($name=~/^parameter_(.*)_/) {
957: $part=$1;
958: } else {
959: $part=0;
960: }
961:
962: # Peel the parameter_ off the parameter name.
963:
964: $name=~s/^.*_([^_]*)$/$1/;
965:
966: # The value is:
967: # type.part.name.value
968:
969: my $newparam=
970: &escape($token->[2]->{'type'}).':'.
971: &escape($part.'.'.$name).'='.
972: &escape($token->[2]->{'value'});
973:
974: # The hash key is param_resourceid.
975: # Multiple parameters for a single resource are & separated in the hash.
976:
977:
978: if (defined($hash{'param_'.$referid})) {
979: $hash{'param_'.$referid}.='&'.$newparam;
980: } else {
981: $hash{'param_'.$referid}=''.$newparam;
982: }
983: #
984: # These parameters have to do with randomly selecting
985: # resources, therefore a separate hash is also created to
986: # make it easy to locate them when actually computing the resource set later on
987: # See the code conditionalized by ($randomize) in loadmap().
988:
989: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) { # Random selection turned on
990: $randompick{$referid}=$token->[2]->{'value'};
991: }
992: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) { # Randomseed provided.
993: $randompickseed{$referid}=$token->[2]->{'value'};
994: }
995: if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) { # Random order turned on.
996: $randomorder{$referid}=$token->[2]->{'value'};
997: }
998:
999: # These parameters have to do with how the URLs of resources are presented to
1000: # course members(?). encrypturl presents encypted url's while
1001: # hiddenresource hides the URL.
1002: #
1003:
1004: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
1005: if ($token->[2]->{'value'}=~/^yes$/i) {
1006: $encurl{$referid}=1;
1007: }
1008: }
1009: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
1010: if ($token->[2]->{'value'}=~/^yes$/i) {
1011: $hiddenurl{$referid}=1;
1012: }
1013: }
1014: }
1015: #
1016: # Parse mapalias parameters.
1017: # these are tags of the form:
1018: # <param to="nn"
1019: # value="some-alias-for-resourceid-nn"
1020: # name="parameter_0_mapalias"
1021: # type="string" />
1022: # A map alias is a textual name for a resource:
1023: # - The to attribute identifies the resource (this gets level qualified below)
1024: # - The value attributes provides the alias string.
1025: # - name must be of the regexp form: /^parameter_(0_)*mapalias$/
1026: # - e.g. the string 'parameter_' followed by 0 or more "0_" strings
1027: # terminating with the string 'mapalias'.
1028: # Examples:
1029: # 'parameter_mapalias', 'parameter_0_mapalias', parameter_0_0_mapalias'
1030: # Invalid to ids are silently ignored.
1031: #
1032: # Parameters:
1033: # token - The token array fromthe HMTML::TokeParser
1034: # lpc - The current map level counter.
1035: #
1036: sub parse_mapalias_param {
1037: my ($token,$lpc) = @_;
1038:
1039: # Fully qualify the to value and ignore the alias if there is no
1040: # corresponding resource.
1041:
1042: my $referid=$lpc.'.'.$token->[2]->{'to'};
1043: return if (!exists($hash{'src_'.$referid}));
1044:
1045: # If this is a valid mapalias parameter,
1046: # Append the target id to the count_mapalias element for that
1047: # alias so that we can detect doubly defined aliases
1048: # e.g.:
1049: # <param to="1" value="george" name="parameter_0_mapalias" type="string" />
1050: # <param to="2" value="george" name="parameter_0_mapalias" type="string" />
1051: #
1052: # The example above is trivial but the case that's important has to do with
1053: # constructing a map that includes a nested map where the nested map may have
1054: # aliases that conflict with aliases established in the enclosing map.
1055: #
1056: # ...and create/update the hash mapalias entry to actually store the alias.
1057: #
1058:
1059: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
1060: &count_mapalias($token->[2]->{'value'},$referid);
1061: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
1062: }
1063: }
1064:
1065: # --------------------------------------------------------- Simplify expression
1066:
1067:
1068: #
1069: # Someone should really comment this to describe what it does to what and why.
1070: #
1071: sub simplify {
1072: my $expression=shift;
1073: # (0&1) = 1
1074: $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
1075: # (8)=8
1076: $expression=~s/\(([_\.\d]+)\)/$1/g;
1077: # 8&8=8
1078: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
1079: # 8|8=8
1080: $expression=~s/([^_\.\d])([_\.\d]+)(?:\|\2)+([^_\.\d])/$1$2$3/g;
1081: # (5&3)&4=5&3&4
1082: $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
1083: # (((5&3)|(4&6)))=((5&3)|(4&6))
1084: $expression=~
1085: s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
1086: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
1087: $expression=~
1088: s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
1089: return $expression;
1090: }
1091:
1092: # -------------------------------------------------------- Build condition hash
1093:
1094: #
1095: # Traces a route recursively through the map after it has been loaded
1096: # (I believe this really visits each resourcde that is reachable fromt he
1097: # start top node.
1098: #
1099: # - Marks hidden resources as hidden.
1100: # - Marks which resource URL's must be encrypted.
1101: # - Figures out (if necessary) the first resource in the map.
1102: # - Further builds the chunks of the big hash that define how
1103: # conditions work
1104: #
1105: # Note that the tracing strategy won't visit resources that are not linked to
1106: # anything or islands in the map (groups of resources that form a path but are not
1107: # linked in to the path that can be traced from the start resource...but that's ok
1108: # because by definition, those resources are not reachable by users of the course.
1109: #
1110: # Parameters:
1111: # sofar - _URI of the prior entry or 0 if this is the top.
1112: # rid - URI of the resource to visit.
1113: # beenhere - list of resources (each resource enclosed by &'s) that have
1114: # already been visited.
1115: # encflag - If true the resource that resulted in a recursive call to us
1116: # has an encoded URL (which means contained resources should too).
1117: # hdnflag - If true,the resource that resulted in a recursive call to us
1118: # was hidden (which means contained resources should be hidden too).
1119: # Returns
1120: # new value indicating how far the map has been traversed (the sofar).
1121: #
1122: sub traceroute {
1123: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
1124: my $newsofar=$sofar=simplify($sofar);
1125:
1126: unless ($beenhere=~/\&\Q$rid\E\&/) {
1127: $beenhere.=$rid.'&';
1128: my ($mapid,$resid)=split(/\./,$rid);
1129: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
1130: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
1131:
1132: if ($hdnflag || lc($hidden) eq 'yes') {
1133: $hiddenurl{$rid}=1;
1134: }
1135: if (!$hdnflag && lc($hidden) eq 'no') {
1136: delete($hiddenurl{$rid});
1137: }
1138:
1139: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
1140: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
1141:
1142: if (($retfrid eq '') && ($hash{'src_'.$rid})
1143: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
1144: $retfrid=$rid;
1145: }
1146:
1147: if (defined($hash{'conditions_'.$rid})) {
1148: $hash{'conditions_'.$rid}=simplify(
1149: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
1150: } else {
1151: $hash{'conditions_'.$rid}=$sofar;
1152: }
1153:
1154: # if the expression is just the 0th condition keep it
1155: # otherwise leave a pointer to this condition expression
1156:
1157: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
1158:
1159: # Recurse if the resource is a map:
1160:
1161: if (defined($hash{'is_map_'.$rid})) {
1162: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
1163: $sofar=$newsofar=
1164: &traceroute($sofar,
1165: $hash{'map_start_'.$hash{'src_'.$rid}},
1166: $beenhere,
1167: $encflag || $encurl{$rid},
1168: $hdnflag || $hiddenurl{$rid});
1169: }
1170: }
1171:
1172: # Processes links to this resource:
1173: # - verify the existence of any conditionals on the link to here.
1174: # - Recurse to any resources linked to us.
1175: #
1176: if (defined($hash{'to_'.$rid})) {
1177: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1178: my $further=$sofar;
1179: #
1180: # If there's a condition associated with this link be sure
1181: # it's been defined else that's an error:
1182: #
1183: if ($hash{'undercond_'.$id}) {
1184: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
1185: $further=simplify('('.'_'.$rid.')&('.
1186: $hash{'condid_'.$hash{'undercond_'.$id}}.')');
1187: } else {
1188: $errtext.= '<br />'.
1189: &mt('Undefined condition ID: [_1]',
1190: $hash{'undercond_'.$id});
1191: }
1192: }
1193: # Recurse to resoruces that have to's to us.
1194: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
1195: $encflag,$hdnflag);
1196: }
1197: }
1198: }
1199: return $newsofar;
1200: }
1201:
1202: # ------------------------------ Cascading conditions, quick access, parameters
1203:
1204: #
1205: # Seems a rather strangely named sub given what the comment above says it does.
1206:
1207:
1208: sub accinit {
1209: my ($uri,$short,$fn)=@_;
1210: my %acchash=();
1211: my %captured=();
1212: my $condcounter=0;
1213: $acchash{'acc.cond.'.$short.'.0'}=0;
1214:
1215: # This loop is only interested in conditions and
1216: # parameters in the big hash:
1217:
1218: foreach my $key (keys(%hash)) {
1219:
1220: # conditions:
1221:
1222: if ($key=~/^conditions/) {
1223: my $expr=$hash{$key};
1224:
1225: # try to find and factor out common sub-expressions
1226: # Any subexpression that is found is simplified, removed from
1227: # the original condition expression and the simplified sub-expression
1228: # substituted back in to the epxression..I'm not actually convinced this
1229: # factors anything out...but instead maybe simplifies common factors(?)
1230:
1231: foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
1232: my $orig=$sub;
1233:
1234: my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
1235: next if (!defined($factor));
1236:
1237: $sub=~s/\Q$factor\E//g;
1238: $sub=~s/^\(/\($factor\(/;
1239: $sub.=')';
1240: $sub=simplify($sub);
1241: $expr=~s/\Q$orig\E/$sub/;
1242: }
1243: $hash{$key}=$expr;
1244:
1245: # If not yet seen, record in acchash and that we've seen it.
1246:
1247: unless (defined($captured{$expr})) {
1248: $condcounter++;
1249: $captured{$expr}=$condcounter;
1250: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
1251: }
1252: # Parameters:
1253:
1254: } elsif ($key=~/^param_(\d+)\.(\d+)/) {
1255: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
1256: $hash{'src_'.$1.'.'.$2});
1257: foreach my $param (split(/\&/,$hash{$key})) {
1258: my ($typename,$value)=split(/\=/,$param);
1259: my ($type,$name)=split(/\:/,$typename);
1260: $parmhash{$prefix.'.'.&unescape($name)}=
1261: &unescape($value);
1262: $parmhash{$prefix.'.'.&unescape($name).'.type'}=
1263: &unescape($type);
1264: }
1265: }
1266: }
1267: # This loop only processes id entries in the big hash.
1268:
1269: foreach my $key (keys(%hash)) {
1270: if ($key=~/^ids/) {
1271: foreach my $resid (split(/\,/,$hash{$key})) {
1272: my $uri=$hash{'src_'.$resid};
1273: my ($uripath,$urifile) =
1274: &Apache::lonnet::split_uri_for_cond($uri);
1275: if ($uripath) {
1276: my $uricond='0';
1277: if (defined($hash{'conditions_'.$resid})) {
1278: $uricond=$captured{$hash{'conditions_'.$resid}};
1279: }
1280: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
1281: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
1282: /(\&\Q$urifile\E\:[^\&]*)/) {
1283: my $replace=$1;
1284: my $regexp=$replace;
1285: #$regexp=~s/\|/\\\|/g;
1286: $acchash{'acc.res.'.$short.'.'.$uripath} =~
1287: s/\Q$regexp\E/$replace\|$uricond/;
1288: } else {
1289: $acchash{'acc.res.'.$short.'.'.$uripath}.=
1290: $urifile.':'.$uricond.'&';
1291: }
1292: } else {
1293: $acchash{'acc.res.'.$short.'.'.$uripath}=
1294: '&'.$urifile.':'.$uricond.'&';
1295: }
1296: }
1297: }
1298: }
1299: }
1300: $acchash{'acc.res.'.$short.'.'}='&:0&';
1301: my $courseuri=$uri;
1302: $courseuri=~s/^\/res\///;
1303: my $regexp = 1;
1304: &Apache::lonnet::delenv('(acc\.|httpref\.)',$regexp);
1305: &Apache::lonnet::appenv(\%acchash);
1306: }
1307:
1308: # ---------------- Selectively delete from randompick maps and hidden url parms
1309:
1310: sub hiddenurls {
1311: my $randomoutentry='';
1312: foreach my $rid (keys(%randompick)) {
1313: my $rndpick=$randompick{$rid};
1314: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
1315: # ------------------------------------------- put existing resources into array
1316: my @currentrids=();
1317: foreach my $key (sort(keys(%hash))) {
1318: if ($key=~/^src_($mpc\.\d+)/) {
1319: if ($hash{'src_'.$1}) { push @currentrids, $1; }
1320: }
1321: }
1322: # rids are number.number and we want to numercially sort on
1323: # the second number
1324: @currentrids=sort {
1325: my (undef,$aid)=split(/\./,$a);
1326: my (undef,$bid)=split(/\./,$b);
1327: $aid <=> $bid;
1328: } @currentrids;
1329: next if ($#currentrids<$rndpick);
1330: # -------------------------------- randomly eliminate the ones that should stay
1331: my (undef,$id)=split(/\./,$rid);
1332: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
1333: my $setcode;
1334: if (defined($randomizationcode{$rid})) {
1335: if ($env{'form.CODE'} eq '') {
1336: $env{'form.CODE'} = $randomizationcode{$rid};
1337: $setcode = 1;
1338: }
1339: }
1340: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
1341: if ($setcode) {
1342: undef($env{'form.CODE'});
1343: undef($setcode);
1344: }
1345: &Apache::lonnet::setup_random_from_rndseed($rndseed);
1346: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
1347: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
1348: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
1349: # -------------------------------------------------------- delete the leftovers
1350: for (my $k=0; $k<=$#currentrids; $k++) {
1351: if ($currentrids[$k]) {
1352: $hash{'randomout_'.$currentrids[$k]}=1;
1353: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
1354: if ($rescount{$mapid}) {
1355: $rescount{$mapid} --;
1356: }
1357: if ($hash{'is_map_'.$currentrids[$k]}) {
1358: if ($mapcount{$mapid}) {
1359: $mapcount{$mapid} --;
1360: }
1361: }
1362: $randomoutentry.='&'.
1363: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
1364: $resid,
1365: $hash{'src_'.$currentrids[$k]}
1366: ).'&';
1367: }
1368: }
1369: }
1370: # ------------------------------ take care of explicitly hidden urls or folders
1371: foreach my $rid (keys(%hiddenurl)) {
1372: $hash{'randomout_'.$rid}=1;
1373: my ($mapid,$resid)=split(/\./,$rid);
1374: if ($rescount{$mapid}) {
1375: $rescount{$mapid} --;
1376: }
1377: if ($hash{'is_map_'.$rid}) {
1378: if ($mapcount{$mapid}) {
1379: $mapcount{$mapid} --;
1380: }
1381: }
1382: $randomoutentry.='&'.
1383: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
1384: $hash{'src_'.$rid}).'&';
1385: }
1386: # --------------------------------------- append randomout entry to environment
1387: if ($randomoutentry) {
1388: &Apache::lonnet::appenv({'acc.randomout' => $randomoutentry});
1389: }
1390: }
1391:
1392: # -------------------------------------- populate big hash with map breadcrumbs
1393:
1394: # Create map_breadcrumbs_$pc from map_hierarchy_$pc by omitting intermediate
1395: # maps not shown in Course Contents table.
1396:
1397: sub mapcrumbs {
1398: foreach my $key (keys(%rescount)) {
1399: if ($hash{'map_hierarchy_'.$key}) {
1400: my $skipnext = 0;
1401: foreach my $id (split(/,/,$hash{'map_hierarchy_'.$key}),$key) {
1402: unless ($skipnext) {
1403: $hash{'map_breadcrumbs_'.$key} .= "$id,";
1404: }
1405: unless (($id == 0) || ($id == 1)) {
1406: if ((!$rescount{$id}) || ($rescount{$id} == 1 && $mapcount{$id} == 1)) {
1407: $skipnext = 1;
1408: } else {
1409: $skipnext = 0;
1410: }
1411: }
1412: }
1413: $hash{'map_breadcrumbs_'.$key} =~ s/,$//;
1414: }
1415: }
1416: }
1417:
1418: # ---------------------------------------------------- Read map and all submaps
1419:
1420: sub readmap {
1421: my ($short,$critmsg_check) = @_;
1422: $short=~s/^\///;
1423:
1424: # TODO: Hidden dependency on current user:
1425:
1426: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
1427:
1428: my $fn=$cenv{'fn'};
1429: my $uri;
1430: $short=~s/\//\_/g;
1431: unless ($uri=$cenv{'url'}) {
1432: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1433: "Could not load course $short.</font>");
1434: return ('',&mt('No course data available.'));;
1435: }
1436: @cond=('true:normal');
1437:
1438: unless (open(LOCKFILE,">","$fn.db.lock")) {
1439: #
1440: # Most likely a permissions problem on the lockfile or its directory.
1441: #
1442: $retfurl = '';
1443: return ($retfurl,'<br />'.&mt('Map not loaded - Lock file could not be opened when reading map:').' <tt>'.$fn.'</tt>.');
1444: }
1445: my $lock=0;
1446: my $gotstate=0;
1447:
1448: # If we can get the lock without delay any files there are idle
1449: # and from some prior request. We'll kill them off and regenerate them:
1450:
1451: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
1452: $lock=1; # Remember that we hold the lock.
1453: &unlink_tmpfiles($fn);
1454: }
1455: undef %randompick;
1456: undef %randompickseed;
1457: undef %randomorder;
1458: undef %randomizationcode;
1459: undef %hiddenurl;
1460: undef %encurl;
1461: undef %rescount;
1462: undef %mapcount;
1463: $retfrid='';
1464: $errtext='';
1465: my ($untiedhash,$untiedparmhash,$tiedhash,$tiedparmhash); # More state flags.
1466:
1467: # if we got the lock, regenerate course regnerate empty files and tie them.
1468:
1469: if ($lock) {
1470: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
1471: $tiedhash = 1;
1472: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
1473: $tiedparmhash = 1;
1474: $gotstate = &build_tmp_hashes($uri,
1475: $fn,
1476: $short,
1477: \%cenv); # TODO: Need to provide requested user@dom
1478: unless ($gotstate) {
1479: &Apache::lonnet::logthis('Failed to write statemap at first attempt '.$fn.' for '.$uri.'.</font>');
1480: }
1481: $untiedparmhash = untie(%parmhash);
1482: unless ($untiedparmhash) {
1483: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1484: 'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
1485: }
1486: }
1487: $untiedhash = untie(%hash);
1488: unless ($untiedhash) {
1489: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1490: 'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
1491: }
1492: }
1493: flock(LOCKFILE,LOCK_UN); # RF: this is what I don't get unless there are other
1494: # unlocked places the remainder happens..seems like if we
1495: # just kept the lock here the rest of the code would have
1496: # been much easier?
1497: }
1498: unless ($lock && $tiedhash && $tiedparmhash) {
1499: # if we are here it is likely because we are already trying to
1500: # initialize the course in another child, busy wait trying to
1501: # tie the hashes for the next 90 seconds, if we succeed forward
1502: # them on to navmaps, if we fail, throw up the Could not init
1503: # course screen
1504: #
1505: # RF: I'm not seeing the case where the ties/unties can fail in a way
1506: # that can be remedied by this. Since we owned the lock seems
1507: # Tie/untie failures are a result of something like a permissions problem instead?
1508: #
1509:
1510: # In any vent, undo what we did manage to do above first:
1511: if ($lock) {
1512: # Got the lock but not the DB files
1513: flock(LOCKFILE,LOCK_UN);
1514: $lock = 0;
1515: }
1516: if ($tiedhash) {
1517: unless($untiedhash) {
1518: untie(%hash);
1519: }
1520: }
1521: if ($tiedparmhash) {
1522: unless($untiedparmhash) {
1523: untie(%parmhash);
1524: }
1525: }
1526: # Log our failure:
1527:
1528: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1529: "Could not tie coursemap $fn for $uri.</font>");
1530: $tiedhash = '';
1531: $tiedparmhash = '';
1532: my $i=0;
1533:
1534: # Keep on retrying the lock for 90 sec until we succeed.
1535:
1536: while($i<90) {
1537: $i++;
1538: sleep(1);
1539: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
1540:
1541: # Got the lock, tie the hashes...the assumption in this code is
1542: # that some other worker thread has created the db files quite recently
1543: # so no load is needed:
1544:
1545: $lock = 1;
1546: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
1547: $tiedhash = 1;
1548: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
1549: $tiedparmhash = 1;
1550: if (-e "$fn.state") {
1551: $retfurl='/adm/navmaps';
1552:
1553: # BUG BUG: Side effect!
1554: # Should conditionalize on something so that we can use this
1555: # to load maps for courses that are not current?
1556: #
1557: &Apache::lonnet::appenv({"request.course.id" => $short,
1558: "request.course.fn" => $fn,
1559: "request.course.uri" => $uri,
1560: "request.course.tied" => time});
1561:
1562: $untiedhash = untie(%hash);
1563: $untiedparmhash = untie(%parmhash);
1564: $gotstate = 1;
1565: last;
1566: }
1567: $untiedparmhash = untie(%parmhash);
1568: }
1569: $untiedhash = untie(%hash);
1570: }
1571: }
1572: }
1573: if ($lock) {
1574: flock(LOCKFILE,LOCK_UN);
1575: $lock = 0;
1576: if ($tiedparmhash) {
1577: unless ($untiedparmhash) {
1578: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1579: 'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
1580: }
1581: }
1582: if ($tiedparmhash) {
1583: unless ($untiedhash) {
1584: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1585: 'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
1586: }
1587: }
1588: }
1589: }
1590: # I think this branch of code is all about what happens if we just did the stuff above,
1591: # but found that the state file did not exist...again if we'd just held the lock
1592: # would that have made this logic simpler..as generating all the files would be
1593: # an atomic operation with respect to the lock.
1594: #
1595: unless ($gotstate) {
1596: $lock = 0;
1597: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1598: 'Could not read statemap '.$fn.' for '.$uri.'.</font>');
1599: &unlink_tmpfiles($fn);
1600: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
1601: $lock=1;
1602: }
1603: undef %randompick;
1604: undef %randompickseed;
1605: undef %randomorder;
1606: undef %randomizationcode;
1607: undef %hiddenurl;
1608: undef %encurl;
1609: undef %rescount;
1610: undef %mapcount;
1611: $errtext='';
1612: $retfrid='';
1613: #
1614: # Once more through the routine of tying and loading and so on.
1615: #
1616: if ($lock) {
1617: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
1618: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
1619: $gotstate = &build_tmp_hashes($uri,$fn,$short,\%cenv); # TODO: User dependent?
1620: unless ($gotstate) {
1621: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1622: 'Failed to write statemap at second attempt '.$fn.' for '.$uri.'.</font>');
1623: }
1624: unless (untie(%parmhash)) {
1625: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1626: 'Could not untie coursemap parmhash '.$fn.'.db for '.$uri.'.</font>');
1627: }
1628: } else {
1629: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1630: 'Could not tie coursemap '.$fn.'__parms.db for '.$uri.'.</font>');
1631: }
1632: unless (untie(%hash)) {
1633: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1634: 'Could not untie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
1635: }
1636: } else {
1637: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1638: 'Could not tie coursemap '.$fn.'.db for '.$uri.'.</font>');
1639: }
1640: flock(LOCKFILE,LOCK_UN);
1641: $lock = 0;
1642: } else {
1643: # Failed to get the immediate lock.
1644:
1645: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1646: 'Could not obtain lock to tie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
1647: }
1648: }
1649: close(LOCKFILE);
1650: unless (($errtext eq '') || ($env{'request.course.uri'} =~ m{^/uploaded/})) {
1651: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},
1652: $errtext); # TODO: User dependent?
1653: }
1654: # ------------------------------------------------- Check for critical messages
1655:
1656: # Depends on user must parameterize this as well..or separate as this is:
1657: # more part of determining what someone sees on entering a course?
1658: # When lonuserstate::readmap() is called from lonroles.pm, i.e.,
1659: # after selecting a role in a course, critical_redirect will be called,
1660: # unless the course has a blocking event in effect, which suppresses
1661: # critical message checking (users without evb priv).
1662: #
1663:
1664: if ($critmsg_check) {
1665: my ($redirect,$url) = &Apache::loncommon::critical_redirect();
1666: if ($redirect) {
1667: $retfurl = $url;
1668: }
1669: }
1670: return ($retfurl,$errtext);
1671: }
1672:
1673: #
1674: # This sub is called when the course hash and the param hash have been tied and
1675: # their lock file is held.
1676: # Parameters:
1677: # $uri - URI that identifies the course.
1678: # $fn - The base path/filename of the files that make up the context
1679: # being built.
1680: # $short - Short course name.
1681: # $cenvref - Reference to the course environment hash returned by
1682: # Apache::lonnet::coursedescription
1683: #
1684: # Assumptions:
1685: # The globals
1686: # %hash, %paramhash are tied to their gdbm files and we hold the lock on them.
1687: #
1688: sub build_tmp_hashes {
1689: my ($uri,$fn,$short,$cenvref) = @_;
1690:
1691: unless(ref($cenvref) eq 'HASH') {
1692: return;
1693: }
1694: my %cenv = %{$cenvref};
1695: my $gotstate = 0;
1696: %hash=(); # empty the global course and parameter hashes.
1697: %parmhash=();
1698: $errtext=''; # No error messages yet.
1699: $pc=0;
1700: &clear_mapalias_count();
1701: &processversionfile(%cenv);
1702:
1703: # URI Of the map file.
1704:
1705: my $furi=&Apache::lonnet::clutter($uri);
1706: #
1707: # the map staring points.
1708: #
1709: $hash{'src_0.0'}=&versiontrack($furi);
1710: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
1711: $hash{'ids_'.$furi}='0.0';
1712: $hash{'is_map_0.0'}=1;
1713:
1714: # Load the map.. note that loadmap may implicitly recurse if the map contains
1715: # sub-maps.
1716:
1717:
1718: &loadmap($uri,'0.0',$short);
1719:
1720: # The code below only executes if there is a starting point for the map>
1721: # Q/BUG??? If there is no start resource for the map should that be an error?
1722: #
1723:
1724: if (defined($hash{'map_start_'.$uri})) {
1725: &Apache::lonnet::appenv({"request.course.id" => $short,
1726: "request.course.fn" => $fn,
1727: "request.course.uri" => $uri,
1728: "request.course.tied" => time});
1729: $env{'request.course.id'}=$short;
1730: &traceroute('0',$hash{'map_start_'.$uri},'&');
1731: &accinit($uri,$short,$fn);
1732: &hiddenurls();
1733: &mapcrumbs();
1734: }
1735: $errtext .= &get_mapalias_errors();
1736: # ------------------------------------------------------- Put versions into src
1737: foreach my $key (keys(%hash)) {
1738: if ($key=~/^src_/) {
1739: $hash{$key}=&putinversion($hash{$key});
1740: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
1741: my ($type, $url) = ($1,$2);
1742: my $value = $hash{$key};
1743: $hash{$type.&putinversion($url)}=$value;
1744: }
1745: }
1746: # ---------------------------------------------------------------- Encrypt URLs
1747: foreach my $id (keys(%encurl)) {
1748: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
1749: $hash{'encrypted_'.$id}=1;
1750: }
1751: # ----------------------------------------------- Close hashes to finally store
1752: # --------------------------------- Routine must pass this point, no early outs
1753: $hash{'first_rid'}=$retfrid;
1754: my ($mapid,$resid)=split(/\./,$retfrid);
1755: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
1756: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
1757: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
1758: if ($hash{'encrypted_'.$retfrid}) {
1759: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
1760: }
1761: $hash{'first_url'}=$retfurl;
1762: # ---------------------------------------------------- Store away initial state
1763: {
1764: my $cfh;
1765: if (open($cfh,">","$fn.state")) {
1766: print $cfh join("\n",@cond);
1767: $gotstate = 1;
1768: } else {
1769: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
1770: "Could not write statemap $fn for $uri.</font>");
1771: }
1772: }
1773: return $gotstate;
1774: }
1775:
1776: sub unlink_tmpfiles {
1777: my ($fn) = @_;
1778: my $file_dir = dirname($fn);
1779:
1780: if ("$file_dir/" eq LONCAPA::tempdir()) {
1781: my @files = qw (.db _symb.db .state _parms.db);
1782: foreach my $file (@files) {
1783: if (-e $fn.$file) {
1784: unless (unlink($fn.$file)) {
1785: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
1786: "Could not unlink ".$fn.$file."</font>");
1787: }
1788: }
1789: }
1790: }
1791: return;
1792: }
1793:
1794: # ------------------------------------------------------- Evaluate state string
1795:
1796: sub evalstate {
1797: my $fn=$env{'request.course.fn'}.'.state';
1798: my $state='';
1799: if (-e $fn) {
1800: my @conditions=();
1801: {
1802: open(my $fh,"<",$fn);
1803: @conditions=<$fh>;
1804: close($fh);
1805: }
1806: my $safeeval = new Safe;
1807: my $safehole = new Safe::Hole;
1808: $safeeval->permit("entereval");
1809: $safeeval->permit(":base_math");
1810: $safeeval->deny(":base_io");
1811: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
1812: foreach my $line (@conditions) {
1813: chomp($line);
1814: my ($condition,$weight)=split(/\:/,$line);
1815: if ($safeeval->reval($condition)) {
1816: if ($weight eq 'force') {
1817: $state.='3';
1818: } else {
1819: $state.='2';
1820: }
1821: } else {
1822: if ($weight eq 'stop') {
1823: $state.='0';
1824: } else {
1825: $state.='1';
1826: }
1827: }
1828: }
1829: }
1830: &Apache::lonnet::appenv({'user.state.'.$env{'request.course.id'} => $state});
1831: return $state;
1832: }
1833:
1834: # This block seems to have code to manage/detect doubly defined
1835: # aliases in maps.
1836:
1837: {
1838: my %mapalias_cache;
1839: sub count_mapalias {
1840: my ($value,$resid) = @_;
1841: push(@{ $mapalias_cache{$value} }, $resid);
1842: }
1843:
1844: sub get_mapalias_errors {
1845: my $error_text;
1846: foreach my $mapalias (sort(keys(%mapalias_cache))) {
1847: next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1);
1848: my $count;
1849: my $which =
1850: join('</li><li>',
1851: map {
1852: my $id = $_;
1853: if (exists($hash{'src_'.$id})) {
1854: $count++;
1855: }
1856: my ($mapid) = split(/\./,$id);
1857: &mt('Resource [_1][_2]in Map [_3]',
1858: $hash{'title_'.$id},'<br />',
1859: $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}});
1860: } (@{ $mapalias_cache{$mapalias} }));
1861: next if ($count < 2);
1862: $error_text .= '<div class="LC_error">'.
1863: &mt('Error: Found the mapalias "[_1]" defined multiple times.',
1864: $mapalias).
1865: '</div><ul><li>'.$which.'</li></ul>';
1866: }
1867: &clear_mapalias_count();
1868: return $error_text;
1869: }
1870: sub clear_mapalias_count {
1871: undef(%mapalias_cache);
1872: }
1873: }
1874: 1;
1875: __END__
1876:
1877: =head1 NAME
1878:
1879: Apache::lonuserstate - Construct and maintain state and binary representation
1880: of course for user
1881:
1882: =head1 SYNOPSIS
1883:
1884: Invoked by lonroles.pm.
1885:
1886: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
1887:
1888: =head1 INTRODUCTION
1889:
1890: This module constructs and maintains state and binary representation
1891: of course for user.
1892:
1893: This is part of the LearningOnline Network with CAPA project
1894: described at http://www.lon-capa.org.
1895:
1896: =head1 SUBROUTINES
1897:
1898: =over
1899:
1900: =item loadmap()
1901:
1902: Loads map from disk
1903:
1904: =item simplify()
1905:
1906: Simplify expression
1907:
1908: =item traceroute()
1909:
1910: Build condition hash
1911:
1912: =item accinit()
1913:
1914: Cascading conditions, quick access, parameters
1915:
1916: =item readmap()
1917:
1918: Read map and all submaps
1919:
1920: =item evalstate()
1921:
1922: Evaluate state string
1923:
1924: =back
1925:
1926: =cut
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