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Diff for /rat/lonuserstate.pm between versions 1.12 and 1.95

version 1.12, 2000/10/20 14:43:53 version 1.95, 2005/07/15 12:29:07
Line 1 Line 1
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # Construct and maintain state and binary representation of course for user  # Construct and maintain state and binary representation of course for user
 #  #
 # (Server for RAT Maps  # $Id$
 #  #
 # (Edit Handler for RAT Maps  # Copyright Michigan State University Board of Trustees
 # (TeX Content Handler  
 #  #
 # 05/29/00,05/30 Gerd Kortemeyer)  # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
 # 7/1 Gerd Kortemeyer)  
 # 7/1,7/3,7/4,7/7,7/8,7/10 Gerd Kortemeyer)  
 #  #
 # 7/15,7/17,7/18,8/1,8/2,8/4,8/5,8/21,8/22,8/23,8/30,  # LON-CAPA is free software; you can redistribute it and/or modify
 # 9/2,9/4,9/29,9/30,10/2,10/11 Gerd Kortemeyer  # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   #
   ###
   
 package Apache::lonuserstate;  package Apache::lonuserstate;
   
   # ------------------------------------------------- modules used by this module
 use strict;  use strict;
 use Apache::Constants qw(:common :http);  use Apache::Constants qw(:common :http);
 use Apache::File;  
 use HTML::TokeParser;  use HTML::TokeParser;
 use Apache::lonnet();  use Apache::lonnet;
   use Apache::loncommon();
 use GDBM_File;  use GDBM_File;
 use Apache::lonmsg;  use Apache::lonmsg;
   use Safe;
   use Safe::Hole;
   use Opcode;
   use Apache::lonenc;
   
 # ---------------------------------------------------- Globals for this package  # ---------------------------------------------------- Globals for this package
   
 my $pc;      # Package counter  my $pc;      # Package counter
 my %hash;    # The big tied hash  my %hash;    # The big tied hash
   my %parmhash;# The hash with the parameters
 my @cond;    # Array with all of the conditions  my @cond;    # Array with all of the conditions
 my $errtext; # variable with all errors  my $errtext; # variable with all errors
   my $retfurl; # variable with the very first URL in the course
   my %randompick; # randomly picked resources
   my %randompickseed; # optional seed for randomly picking resources
   my %encurl; # URLs in this folder are supposed to be encrypted
   my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
   
   # ----------------------------------- Remove version from URL and store in hash
   
   sub versiontrack {
       my $uri=shift;
       if ($uri=~/\.(\d+)\.\w+$/) {
    my $version=$1;
    $uri=~s/\.\d+\.(\w+)$/\.$1/;
           unless ($hash{'version_'.$uri}) {
       $hash{'version_'.$uri}=$version;
    }
       }
       return $uri;
   }
   
   # -------------------------------------------------------------- Put in version
   
   sub putinversion {
       my $uri=shift;
       my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
       if ($hash{'version_'.$uri}) {
    my $version=$hash{'version_'.$uri};
    if ($version eq 'mostrecent') { return $uri; }
    if ($version eq &Apache::lonnet::getversion(
    &Apache::lonnet::filelocation('',$uri))) 
                { return $uri; }
    $uri=~s/\.(\w+)$/\.$version\.$1/;
       }
       &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
       return $uri;
   }
   
   # ----------------------------------------- Processing versions file for course
   
   sub processversionfile {
       my %cenv=@_;
       my %versions=&Apache::lonnet::dump('resourceversions',
          $cenv{'domain'},
          $cenv{'num'});
       foreach (keys %versions) {
    if ($_=~/^error\:/) { return; }
    $hash{'version_'.$_}=$versions{$_};
       }
   }
   
 # --------------------------------------------------------- Loads map from disk  # --------------------------------------------------------- Loads map from disk
   
Line 41  sub loadmap { Line 110  sub loadmap {
     $hash{'map_pc_'.$uri}=$lpc;      $hash{'map_pc_'.$uri}=$lpc;
     $hash{'map_id_'.$lpc}=$uri;      $hash{'map_id_'.$lpc}=$uri;
   
     my $fn='/home/httpd/html'.$uri;  # Determine and check filename
       my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
   
       my $ispage=($fn=~/\.page$/);
   
     unless (($fn=~/\.sequence$/) ||      unless (($fn=~/\.sequence$/) ||
             ($fn=~/\.page$/)) {               ($fn=~/\.page$/)) { 
        $errtext.="Invalid map: $fn\n";   $errtext.="Invalid map: $fn\n";
        return OK;    return OK; 
     }      }
   
     unless (-e $fn) {      my $instr=&Apache::lonnet::getfile($fn);
  my $returned=Apache::lonnet::repcopy($fn);  
         unless ($returned eq OK) {      unless ($instr eq -1) {
            $errtext.="Could not import: $fn - ";  
            if ($returned eq HTTP_SERVICE_UNAVAILABLE) {  # Successfully got file, parse it
       $errtext.="Server unavailable\n";  
            }  
            if ($returned eq HTTP_NOT_FOUND) {  
       $errtext.="File not found\n";  
            }  
            if ($returned eq FORBIDDEN) {  
       $errtext.="Access forbidden\n";  
            }  
            return OK;  
        }  
     }  
   
     if (-e $fn) {  
         my @content;  
         {  
     my $fh=Apache::File->new($fn);  
             @content=<$fh>;  
         }  
         my $instr=join('',@content);  
         my $parser = HTML::TokeParser->new(\$instr);          my $parser = HTML::TokeParser->new(\$instr);
    $parser->attr_encoded(1);
         my $token;          my $token;
   
         my $linkpc=0;          my $linkpc=0;
Line 86  sub loadmap { Line 141  sub loadmap {
     if ($token->[0] eq 'S') {      if ($token->[0] eq 'S') {
                 if ($token->[1] eq 'resource') {                  if ($token->[1] eq 'resource') {
 # -------------------------------------------------------------------- Resource  # -------------------------------------------------------------------- Resource
                       if ($token->[2]->{'type'} eq 'zombie') { next; }
                     my $rid=$lpc.'.'.$token->[2]->{'id'};                      my $rid=$lpc.'.'.$token->[2]->{'id'};
   
                     $hash{'kind_'.$rid}='res';                      $hash{'kind_'.$rid}='res';
                     $hash{'title_'.$rid}=$token->[2]->{'title'};                      $hash{'title_'.$rid}=$token->[2]->{'title'};
                     my $turi=$token->[2]->{'src'};                      my $turi=&versiontrack($token->[2]->{'src'});
                     $hash{'src_'.$rid}=$turi;                      if ($token->[2]->{'version'}) {
    unless ($hash{'version_'.$turi}) {
                     if (defined($hash{'ids_'.$turi})) {      $hash{'version_'.$turi}=$1;
                         $hash{'ids_'.$turi}.=','.$rid;   }
       }
       my $title=$token->[2]->{'title'};
       $title=~s/\&colon\;/\:/gs;
   #    my $symb=&Apache::lonnet::encode_symb($uri,
   #  $token->[2]->{'id'},
   #  $turi);
   #    &Apache::lonnet::do_cache_new('title',$symb,$title);
                       unless ($ispage) {
                           $turi=~/\.(\w+)$/;
                           my $embstyle=&Apache::loncommon::fileembstyle($1);
                           if ($token->[2]->{'external'} eq 'true') { # external
                               $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
                           } elsif ($turi=~/^\/*uploaded\//) { # uploaded
       if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
                                   $turi='/adm/wrapper'.$turi;
       } elsif ($embstyle eq 'ssi') {
    #do nothing with these
       } elsif ($turi!~/\.(sequence|page)$/) {
    $turi='/adm/coursedocs/showdoc'.$turi;
                               }
                           } elsif ($turi=~/\S/) { # normal non-empty internal resource
       my $mapdir=$uri;
       $mapdir=~s/[^\/]+$//;
       $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
       if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
    $turi='/adm/wrapper'.$turi;
       }
                           }
       }
   # Store reverse lookup, remove query string
       my $idsuri=$turi;
       $idsuri=~s/\?.+$//;
                       if (defined($hash{'ids_'.$idsuri})) {
                           $hash{'ids_'.$idsuri}.=','.$rid;
                     } else {                      } else {
                         $hash{'ids_'.$turi}=''.$rid;                          $hash{'ids_'.$idsuri}=''.$rid;
                     }                      }
                  
                       if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
    $turi.='?register=1';
       }
   
                     if ($token->[2]->{'src'}=~/\/\//) {                      $hash{'src_'.$rid}=$turi;
   
                       if ($token->[2]->{'external'} eq 'true') {
                         $hash{'ext_'.$rid}='true:';                          $hash{'ext_'.$rid}='true:';
                     } else {                      } else {
                         $hash{'ext_'.$rid}='false:';                          $hash{'ext_'.$rid}='false:';
Line 165  sub loadmap { Line 260  sub loadmap {
                     } else {                      } else {
                         $hash{'from_'.$goesto}=''.$linkid;                          $hash{'from_'.$goesto}=''.$linkid;
                     }                      }
                 }                   } elsif ($token->[1] eq 'param') {
   # ------------------------------------------------------------------- Parameter
   
                       my $referid=$lpc.'.'.$token->[2]->{'to'};
       my $name=$token->[2]->{'name'};
       my $part;
       if ($name=~/^parameter_(.*)_/) {
    $part=$1;
       } else {
    $part=0;
       }
       $name=~s/^.*_([^_]*)$/$1/;
                       my $newparam=
    &Apache::lonnet::escape($token->[2]->{'type'}).':'.
    &Apache::lonnet::escape($part.'.'.$name).'='.
    &Apache::lonnet::escape($token->[2]->{'value'});
                       if (defined($hash{'param_'.$referid})) {
                           $hash{'param_'.$referid}.='&'.$newparam;
                       } else {
                           $hash{'param_'.$referid}=''.$newparam;
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
    $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
    $randompick{$referid}=$token->[2]->{'value'};
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
    $randompick{$referid}=$token->[2]->{'value'};
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
    if ($token->[2]->{'value'}=~/^yes$/i) {
       $encurl{$referid}=1;
    }
                       }
                       if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
    if ($token->[2]->{'value'}=~/^yes$/i) {
       $hiddenurl{$referid}=1;
    }
                       }
                   } 
   
             }              }
         }          }
   
     } else {      } else {
         $errtext.='Map not loaded: The file does not exist. ';          $errtext.='Map not loaded: The file ('.$fn.') does not exist. ';
     }      }
 }  }
   
 # --------------------------------------------------------- Simplify expression  # --------------------------------------------------------- Simplify expression
   
 sub simplify {  sub simplify {
    my $expression=shift;      my $expression=shift;
 # (8)=8  # (8)=8
    $expression=~s/\((\d+)\)/$1/g;      $expression=~s/\((\d+)\)/$1/g;
 # 8&8=8  # 8&8=8
    $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;      $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
 # 8|8=8  # 8|8=8
    $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;      $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
 # (5&3)&4=5&3&4  # (5&3)&4=5&3&4
    $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;      $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
 # (((5&3)|(4&6)))=((5&3)|(4&6))  # (((5&3)|(4&6)))=((5&3)|(4&6))
    $expression=~      $expression=~
        s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;   s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
 # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)  # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
    $expression=~      $expression=~
        s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;   s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
    return $expression;      return $expression;
 }  }
   
 # -------------------------------------------------------- Build condition hash  # -------------------------------------------------------- Build condition hash
   
 sub traceroute {  sub traceroute {
     my ($sofar,$rid,$beenhere)=@_;      my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
     $sofar=simplify($sofar);      my $newsofar=$sofar=simplify($sofar);
     unless ($beenhere=~/\&$rid\&/) {      unless ($beenhere=~/\&$rid\&/) {
        $beenhere.=$rid.'&';     $beenhere.=$rid.'&';  
        if (defined($hash{'conditions_'.$rid})) {   my ($mapid,$resid)=split(/\./,$rid);
    $hash{'conditions_'.$rid}=simplify(   my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
    my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
   
    if ($hdnflag || lc($hidden) eq 'yes') {
       $hiddenurl{$rid}=1;
    }
    if (!$hdnflag && lc($hidden) eq 'no') {
       delete($hiddenurl{$rid});
    }
   
    my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
    if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
    if (($retfurl eq '') && ($hash{'src_'.$rid})
       && ($hash{'src_'.$rid}!~/\.sequence$/)) {
       $retfurl=$hash{'src_'.$rid}.(($hash{'src_'.$rid}=~/\?/)?'&':'?').
    'symb='.$symb;
    }
    if (defined($hash{'conditions_'.$rid})) {
       $hash{'conditions_'.$rid}=simplify(
            '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');             '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
        } else {   } else {
            $hash{'conditions_'.$rid}=$sofar;      $hash{'conditions_'.$rid}=$sofar;
        }   }
        if (defined($hash{'is_map_'.$rid})) {   $newsofar=$hash{'conditions_'.$rid};
            if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {   if (defined($hash{'is_map_'.$rid})) {
        &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');      if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
                if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {   $sofar=$newsofar=
    $sofar=      &traceroute($sofar,
                   $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};   $hash{'map_start_'.$hash{'src_'.$rid}},'&',
                }   $encflag || $encurl{$rid},
            }   $hdnflag || $hiddenurl{$rid});
        }      }
        if (defined($hash{'to_'.$rid})) {   }
           map {   if (defined($hash{'to_'.$rid})) {
       foreach (split(/\,/,$hash{'to_'.$rid})) {
  my $further=$sofar;   my $further=$sofar;
                 if ($hash{'undercond_'.$_}) {                  if ($hash{'undercond_'.$_}) {
    if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {      if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
         $further=simplify('('.$further.')&('.   $further=simplify('('.$further.')&('.
                               $hash{'condid_'.$hash{'undercond_'.$_}}.')');    $hash{'condid_'.$hash{'undercond_'.$_}}.')');
    } else {      } else {
                        $errtext.='Undefined condition ID: '   $errtext.='Undefined condition ID: '
                                  .$hash{'undercond_'.$_}.'. ';      .$hash{'undercond_'.$_}.'. ';
                    }      }
                 }                  }
                 &traceroute($further,$hash{'goesto_'.$_},$beenhere);                  $newsofar=&traceroute($further,$hash{'goesto_'.$_},$beenhere,
           } split(/\,/,$hash{'to_'.$rid});        $encflag,$hdnflag);
        }      }
    }
     }      }
       return $newsofar;
 }  }
   
 # ------------------------------------------ Cascading conditions, quick access  # ------------------------------ Cascading conditions, quick access, parameters
   
 sub accinit {  sub accinit {
     my ($uri,$short,$fn)=@_;      my ($uri,$short,$fn)=@_;
Line 244  sub accinit { Line 400  sub accinit {
     my %captured=();      my %captured=();
     my $condcounter=0;      my $condcounter=0;
     $acchash{'acc.cond.'.$short.'.0'}=0;      $acchash{'acc.cond.'.$short.'.0'}=0;
     map {      foreach (keys %hash) {
        if ($_=~/^conditions/) {   if ($_=~/^conditions/) {
   my $expr=$hash{$_};      my $expr=$hash{$_};
           map {      foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
              my $sub=$_;   my $sub=$_;
              my $orig=$_;   my $orig=$_;
              $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;   $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
              my $factor=$1;   my $factor=$1;
              $sub=~s/$factor//g;   $sub=~s/$factor//g;
              $sub=~s/^\(/\($factor\(/;   $sub=~s/^\(/\($factor\(/;
      $sub.=')';   $sub.=')';
              $sub=simplify($sub);   $sub=simplify($sub);
              $orig=~s/(\W)/\\$1/g;   $orig=~s/(\W)/\\$1/g;
       $expr=~s/$orig/$sub/;   $expr=~s/$orig/$sub/;
   } ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g);      }
           $hash{$_}=$expr;      $hash{$_}=$expr;
           unless (defined($captured{$expr})) {      unless (defined($captured{$expr})) {
       $condcounter++;   $condcounter++;
               $captured{$expr}=$condcounter;   $captured{$expr}=$condcounter;
               $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;   $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
           }       } 
         }   } elsif ($_=~/^param_(\d+)\.(\d+)/) {
     } keys %hash;      my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
     map {      $hash{'src_'.$1.'.'.$2});
       foreach (split(/\&/,$hash{$_})) {
    my ($typename,$value)=split(/\=/,$_);
    my ($type,$name)=split(/\:/,$typename);
    $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
       &Apache::lonnet::unescape($value);
    $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
       &Apache::lonnet::unescape($type);
       }
    }
       }
       foreach (keys %hash) {
  if ($_=~/^ids/) {   if ($_=~/^ids/) {
     my $resid=$hash{$_};      foreach (split(/\,/,$hash{$_})) {
             my $uri=$hash{'src_'.$resid};   my $resid=$_;
             my @uriparts=split(/\//,$uri);   my $uri=$hash{'src_'.$resid};
             my $urifile=$uriparts[$#uriparts];   $uri=~s/^\/adm\/wrapper//;
             $#uriparts--;   $uri=&Apache::lonnet::declutter($uri);
             my $uripath=join('/',@uriparts);   my @uriparts=split(/\//,$uri);
             $uripath=~s/^\/res\///;   my $urifile=$uriparts[$#uriparts];
             if (defined($hash{'conditions_'.$resid})) {   $#uriparts--;
   $urifile.=':'.$captured{$hash{'conditions_'.$resid}};   my $uripath=join('/',@uriparts);
             } else {   if ($uripath) {
                 $urifile.=':0';      my $uricond='0';
       if (defined($hash{'conditions_'.$resid})) {
    $uricond=$captured{$hash{'conditions_'.$resid}};
       }
       if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
    if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
       /(\&\Q$urifile\E\:[^\&]*)/) {
       my $replace=$1;
       my $regexp=$replace;
       #$regexp=~s/\|/\\\|/g;
       $acchash{'acc.res.'.$short.'.'.$uripath}
       =~s/\Q$regexp\E/$replace\|$uricond/;
    } else {
       $acchash{'acc.res.'.$short.'.'.$uripath}.=
    $urifile.':'.$uricond.'&';
    }
       } else {
    $acchash{'acc.res.'.$short.'.'.$uripath}=
       '&'.$urifile.':'.$uricond.'&';
       }
    } 
       }
    }
       }
       $acchash{'acc.res.'.$short.'.'}='&:0&';
       my $courseuri=$uri;
       $courseuri=~s/^\/res\///;
       &Apache::lonnet::delenv('(acc\.|httpref\.)');
       &Apache::lonnet::appenv(%acchash);
   }
   
   # ---------------- Selectively delete from randompick maps and hidden url parms
   
   sub hiddenurls {
       my $randomoutentry='';
       foreach my $rid (keys %randompick) {
           my $rndpick=$randompick{$rid};
           my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
   # ------------------------------------------- put existing resources into array
           my @currentrids=();
           foreach (sort(keys(%hash))) {
       if ($_=~/^src_($mpc\.\d+)/) {
    if ($hash{'src_'.$1}) { push @currentrids, $1; }
             }              }
             if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {          }
  $acchash{'acc.res.'.$short.'.'.$uripath}.=$urifile.'&';   # rids are number.number and we want to numercially sort on 
             } else {          # the second number
                 $acchash{'acc.res.'.$short.'.'.$uripath}='&'.$urifile.'&';   @currentrids=sort {
       my (undef,$aid)=split(/\./,$a);
       my (undef,$bid)=split(/\./,$b);
       $aid <=> $bid;
    } @currentrids;
           next if ($#currentrids<$rndpick);
   # -------------------------------- randomly eliminate the ones that should stay
    my (undef,$id)=split(/\./,$rid);
           if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
    my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
    &Apache::lonnet::setup_random_from_rndseed($rndseed);
    my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
           for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
    #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
   # -------------------------------------------------------- delete the leftovers
           for (my $k=0; $k<=$#currentrids; $k++) {
               if ($currentrids[$k]) {
    $hash{'randomout_'.$currentrids[$k]}=1;
                   my ($mapid,$resid)=split(/\./,$currentrids[$k]);
                   $randomoutentry.='&'.
       &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
    $resid,
    $hash{'src_'.$currentrids[$k]}
    ).'&';
             }              }
         }          }
     } keys %hash;      }
     my $courseuri=$uri;  # ------------------------------ take care of explicitly hidden urls or folders
     $courseuri=~s/^\/res\///;      foreach my $rid (keys %hiddenurl) {
     &Apache::lonnet::appenv(%acchash,   $hash{'randomout_'.$rid}=1;
                             "request.course.id"  => $short,   my ($mapid,$resid)=split(/\./,$rid);
                             "request.course.fn"  => $fn,   $randomoutentry.='&'.
                             "request.course.uri" => $courseuri);       &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
    $hash{'src_'.$rid}).'&';
       }
   # --------------------------------------- append randomout entry to environment
       if ($randomoutentry) {
    &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
       }
 }  }
   
 # ---------------------------------------------------- Read map and all submaps  # ---------------------------------------------------- Read map and all submaps
   
 sub readmap {  sub readmap {
    my $short=shift;      my $short=shift;
    $short=~s/^\///;      $short=~s/^\///;
    my %cenv=&Apache::lonnet::coursedescription($short);      my %cenv=&Apache::lonnet::coursedescription($short);
    my $fn=$cenv{'fn'};      my $fn=$cenv{'fn'};
    my $uri;      my $uri;
    $short=~s/\//\_/g;      $short=~s/\//\_/g;
    unless ($uri=$cenv{'url'}) {       unless ($uri=$cenv{'url'}) { 
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".   &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                        "Could not load course $short.</font>");    "Could not load course $short.</font>"); 
       return 'No course data available.';   return 'No course data available.';
    }      }
    @cond=('true:normal');      @cond=('true:normal');
    unlink($fn.'.db');      #unlink($fn.'.db');
    unlink($fn.'_symb.db');      #unlink($fn.'_symb.db');
    unlink($fn.'.state');      unlink($fn.'.state');
    if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) {      unlink($fn.'parms.db');
     %hash=();      undef %randompick;
     $errtext='';      undef %hiddenurl;
     $pc=0;      undef %encurl;
     loadmap($uri);      $retfurl='';
     if (defined($hash{'map_start_'.$uri})) {      if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
         &traceroute('0',$hash{'map_start_'.$uri},'&');   (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
         &accinit($uri,$short,$fn);   %hash=();
     }   %parmhash=();
     unless (untie(%hash)) {   $errtext='';
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".   $pc=0;
                        "Could not untie coursemap $fn for $uri.</font>");    &processversionfile(%cenv);
     }   my $furi=&Apache::lonnet::clutter($uri);
     {   $hash{'src_0.0'}=&versiontrack($furi);
      my $cfh;   $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
      if ($cfh=Apache::File->new(">$fn.state")) {   $hash{'ids_'.$furi}='0.0';
         print $cfh join("\n",@cond);   $hash{'is_map_0.0'}=1;
      } else {   loadmap($uri);
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".   if (defined($hash{'map_start_'.$uri})) {
                        "Could not write statemap $fn for $uri.</font>");       &Apache::lonnet::appenv("request.course.id"  => $short,
      }      "request.course.fn"  => $fn,
     }        "request.course.uri" => $uri);
    } else {      &traceroute('0',$hash{'map_start_'.$uri},'&');
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".      &accinit($uri,$short,$fn);
                        "Could not tie coursemap $fn for $uri.</font>");       &hiddenurls();
    }   }
    &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);  # ------------------------------------------------------- Put versions into src
    return $errtext;   foreach (keys %hash) {
       if ($_=~/^src\_/) {
    $hash{$_}=&putinversion($hash{$_});
       }
    }
   # ---------------------------------------------------------------- Encrypt URLs
    foreach (keys %encurl) {
   #    $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
       $hash{'encrypted_'.$_}=1;
    }
   # ----------------------------------------------- Close hashes to finally store
   # --------------------------------- Routine must pass this point, no early outs
    $hash{'first_url'}=$retfurl;
    unless ((untie(%hash)) && (untie(%parmhash))) {
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".
        "Could not untie coursemap $fn for $uri.</font>"); 
    }
   # ---------------------------------------------------- Store away initial state
    {
       my $cfh;
       if (open($cfh,">$fn.state")) {
    print $cfh join("\n",@cond);
       } else {
    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
    "Could not write statemap $fn for $uri.</font>"); 
       }
    }  
       } else {
    # if we are here it is likely because we are already trying to 
    # initialize the course in another child, busy wait trying to 
    # tie the hashes for the next 90 seconds, if we succeed forward 
    # them on to navmaps, if we fail, throw up the Could not init 
    # course screen
    untie(%hash);
    untie(%parmhash);
    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
    "Could not tie coursemap $fn for $uri.</font>"); 
    my $i=0;
    while($i<90) {
       $i++;
       sleep(1);
       if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
    if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
       $retfurl='/adm/navmaps';
       &Apache::lonnet::appenv("request.course.id"  => $short,
       "request.course.fn"  => $fn,
       "request.course.uri" => $uri);
       untie(%hash);
       untie(%parmhash);
       last;
    }
       }
       untie(%hash);
       untie(%parmhash);
    }
       }
       &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
   # ------------------------------------------------- Check for critical messages
   
       my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
      $env{'user.name'});
       if ($what[0]) {
    if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
       $retfurl='/adm/email?critical=display';
           }
       }
       return ($retfurl,$errtext);
 }  }
    
   # ------------------------------------------------------- Evaluate state string
   
   sub evalstate {
       my $fn=$env{'request.course.fn'}.'.state';
       my $state='';
       if (-e $fn) {
    my @conditions=();
    {
       my $fh=Apache::File->new($fn);
       @conditions=<$fh>;
    }  
    my $safeeval = new Safe;
    my $safehole = new Safe::Hole;
    $safeeval->permit("entereval");
    $safeeval->permit(":base_math");
    $safeeval->deny(":base_io");
    $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
    foreach my $line (@conditions) {
       chomp($line);
       my ($condition,$weight)=split(/\:/,$line);
       if ($safeeval->reval($condition)) {
    if ($weight eq 'force') {
       $state.='3';
    } else {
       $state.='2';
    }
       } else {
    if ($weight eq 'stop') {
       $state.='0';
    } else {
       $state.='1';
    }
       }
    }
       }
       &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
       return $state;
   }
   
 1;  1;
 __END__  __END__
   
   =head1 NAME
   
   Apache::lonuserstate - Construct and maintain state and binary representation
   of course for user
   
   =head1 SYNOPSIS
   
   Invoked by lonroles.pm.
   
   &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
   
   =head1 INTRODUCTION
   
   This module constructs and maintains state and binary representation
   of course for user.
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   =head1 HANDLER SUBROUTINE
   
   There is no handler subroutine.
   
   =head1 OTHER SUBROUTINES
   
   =over 4
   
   =item *
   
   loadmap() : Loads map from disk
   
   =item *
   
   simplify() : Simplify expression
   
   =item *
   
   traceroute() : Build condition hash
   
   =item *
   
   accinit() : Cascading conditions, quick access, parameters
   
   =item *
   
   readmap() : Read map and all submaps
   
   =item *
   
   evalstate() : Evaluate state string
   
   =back
   
   =cut
Removed from v.1.12  
changed lines
  Added in v.1.95

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