# The LearningOnline Network with CAPA # Construct and maintain state and binary representation of course for user # # (Server for RAT Maps # # (Edit Handler for RAT Maps # (TeX Content Handler # # 05/29/00,05/30 Gerd Kortemeyer) # 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, # 9/2,9/4,9/29,9/30,10/2,10/11,10/30,10/31, # 11/1,11/2,11/14,11/16,11/22,12/28, # 07/05/01,08/30 Gerd Kortemeyer package Apache::lonuserstate; use strict; use Apache::Constants qw(:common :http); use Apache::File; use HTML::TokeParser; use Apache::lonnet(); use GDBM_File; use Apache::lonmsg; use Safe; use Safe::Hole; use Opcode; # ---------------------------------------------------- Globals for this package my $pc; # Package counter my %hash; # The big tied hash my %parmhash;# The hash with the parameters my @cond; # Array with all of the conditions my $errtext; # variable with all errors my $retfurl; # variable with the very first URL in the course # --------------------------------------------------------- Loads map from disk sub loadmap { my $uri=shift; if ($hash{'map_pc_'.$uri}) { return OK; } $pc++; my $lpc=$pc; $hash{'map_pc_'.$uri}=$lpc; $hash{'map_id_'.$lpc}=$uri; my $fn='/home/httpd/html'.$uri; unless (($fn=~/\.sequence$/) || ($fn=~/\.page$/)) { $errtext.="Invalid map: $fn\n"; return OK; } my $ispage=($fn=~/\.page$/); unless (-e $fn) { my $returned=Apache::lonnet::repcopy($fn); unless ($returned eq OK) { $errtext.="Could not import: $fn - "; if ($returned eq HTTP_SERVICE_UNAVAILABLE) { $errtext.="Server unavailable\n"; } if ($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 $token; my $linkpc=0; $fn=~/\.(\w+)$/; $hash{'map_type_'.$lpc}=$1; while ($token = $parser->get_token) { if ($token->[0] eq 'S') { if ($token->[1] eq 'resource') { # -------------------------------------------------------------------- Resource my $rid=$lpc.'.'.$token->[2]->{'id'}; $hash{'kind_'.$rid}='res'; $hash{'title_'.$rid}=$token->[2]->{'title'}; my $turi=$token->[2]->{'src'}; unless ($ispage) { $turi=~/\.(\w+)$/; my $embstyle=&Apache::lonnet::fileembstyle($1); if ($token->[2]->{'external'} eq 'true') { $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//; } else { my $embstyle=&Apache::lonnet::fileembstyle($1); if (($embstyle eq 'img') || ($embstyle eq 'emb')) { $turi='/adm/wrapper'.$turi; } } } $hash{'src_'.$rid}=$turi; if (defined($hash{'ids_'.$turi})) { $hash{'ids_'.$turi}.=','.$rid; } else { $hash{'ids_'.$turi}=''.$rid; } if ($token->[2]->{'external'} eq 'true') { $hash{'ext_'.$rid}='true:'; } else { $hash{'ext_'.$rid}='false:'; } if ($token->[2]->{'type'}) { $hash{'type_'.$rid}=$token->[2]->{'type'}; if ($token->[2]->{'type'} eq 'start') { $hash{'map_start_'.$uri}="$rid"; } if ($token->[2]->{'type'} eq 'finish') { $hash{'map_finish_'.$uri}="$rid"; } } else { $hash{'type_'.$rid}='normal'; } if (($turi=~/\.sequence$/) || ($turi=~/\.page$/)) { $hash{'is_map_'.$rid}=1; &loadmap($turi); } } elsif ($token->[1] eq 'condition') { # ------------------------------------------------------------------- Condition my $rid=$lpc.'.'.$token->[2]->{'id'}; $hash{'kind_'.$rid}='cond'; $cond[$#cond+1]=$token->[2]->{'value'}; $hash{'condid_'.$rid}=$#cond; if ($token->[2]->{'type'}) { $cond[$#cond].=':'.$token->[2]->{'type'}; } else { $cond[$#cond].=':normal'; } } elsif ($token->[1] eq 'link') { # ----------------------------------------------------------------------- Links $linkpc++; my $linkid=$lpc.'.'.$linkpc; my $goesto=$lpc.'.'.$token->[2]->{'to'}; my $comesfrom=$lpc.'.'.$token->[2]->{'from'}; my $undercond=0; if ($token->[2]->{'condition'}) { $undercond=$lpc.'.'.$token->[2]->{'condition'}; } $hash{'goesto_'.$linkid}=$goesto; $hash{'comesfrom_'.$linkid}=$comesfrom; $hash{'undercond_'.$linkid}=$undercond; if (defined($hash{'to_'.$comesfrom})) { $hash{'to_'.$comesfrom}.=','.$linkid; } else { $hash{'to_'.$comesfrom}=''.$linkid; } if (defined($hash{'from_'.$goesto})) { $hash{'from_'.$goesto}.=','.$linkid; } else { $hash{'from_'.$goesto}=''.$linkid; } } elsif ($token->[1] eq 'param') { # ------------------------------------------------------------------- Parameter my $referid=$lpc.'.'.$token->[2]->{'to'}; my $part=$token->[2]->{'part'}; unless ($part) { $part=0; } my $newparam= &Apache::lonnet::escape($token->[2]->{'type'}).':'. &Apache::lonnet::escape($part.'.'. $token->[2]->{'name'}).'='. &Apache::lonnet::escape($token->[2]->{'value'}); if (defined($hash{'param_'.$referid})) { $hash{'param_'.$referid}.='&'.$newparam; } else { $hash{'param_'.$referid}=''.$newparam; } } } } } else { $errtext.='Map not loaded: The file does not exist. '; } } # --------------------------------------------------------- Simplify expression sub simplify { my $expression=shift; # (8)=8 $expression=~s/\((\d+)\)/$1/g; # 8&8=8 $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g; # 8|8=8 $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g; # (5&3)&4=5&3&4 $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g; # (((5&3)|(4&6)))=((5&3)|(4&6)) $expression=~ s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g; # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2) $expression=~ s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g; return $expression; } # -------------------------------------------------------- Build condition hash sub traceroute { my ($sofar,$rid,$beenhere)=@_; $sofar=simplify($sofar); unless ($beenhere=~/\&$rid\&/) { $beenhere.=$rid.'&'; if ($retfurl eq '') { $retfurl=$hash{'src_'.$rid}; } if (defined($hash{'conditions_'.$rid})) { $hash{'conditions_'.$rid}=simplify( '('.$hash{'conditions_'.$rid}.')|('.$sofar.')'); } else { $hash{'conditions_'.$rid}=$sofar; } if (defined($hash{'is_map_'.$rid})) { if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) { &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&'); if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) { $sofar= $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}}; } } } if (defined($hash{'to_'.$rid})) { map { my $further=$sofar; if ($hash{'undercond_'.$_}) { if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) { $further=simplify('('.$further.')&('. $hash{'condid_'.$hash{'undercond_'.$_}}.')'); } else { $errtext.='Undefined condition ID: ' .$hash{'undercond_'.$_}.'. '; } } &traceroute($further,$hash{'goesto_'.$_},$beenhere); } split(/\,/,$hash{'to_'.$rid}); } } } # ------------------------------ Cascading conditions, quick access, parameters sub accinit { my ($uri,$short,$fn)=@_; my %acchash=(); my %captured=(); my $condcounter=0; $acchash{'acc.cond.'.$short.'.0'}=0; map { if ($_=~/^conditions/) { my $expr=$hash{$_}; map { my $sub=$_; my $orig=$_; $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/; my $factor=$1; $sub=~s/$factor//g; $sub=~s/^\(/\($factor\(/; $sub.=')'; $sub=simplify($sub); $orig=~s/(\W)/\\$1/g; $expr=~s/$orig/$sub/; } ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g); $hash{$_}=$expr; unless (defined($captured{$expr})) { $condcounter++; $captured{$expr}=$condcounter; $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr; } } elsif ($_=~/^param_(\d+)\.(\d+)/) { my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}). '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2}); map { my ($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); } split(/\&/,$hash{$_}); } } keys %hash; map { if ($_=~/^ids/) { map { my $resid=$_; my $uri=$hash{'src_'.$resid}; $uri=~s/^\/adm\/wrapper//; my @uriparts=split(/\//,$uri); my $urifile=$uriparts[$#uriparts]; $#uriparts--; my $uripath=join('/',@uriparts); $uripath=~s/^\/res\///; if ($uripath) { 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}=~ /(\&$urifile\:[^\&]*)/) { my $replace=$1; $acchash{'acc.res.'.$short.'.'.$uripath} =~s/$replace/$replace\|$uricond/; } else { $acchash{'acc.res.'.$short.'.'.$uripath}.= $urifile.':'.$uricond.'&'; } } else { $acchash{'acc.res.'.$short.'.'.$uripath}= '&'.$urifile.':'.$uricond.'&'; } } } split(/\,/,$hash{$_}); } } keys %hash; my $courseuri=$uri; $courseuri=~s/^\/res\///; &Apache::lonnet::delenv('(acc\.|httpref\.)'); &Apache::lonnet::appenv(%acchash, "request.course.id" => $short, "request.course.fn" => $fn, "request.course.uri" => $courseuri); } # ---------------------------------------------------- Read map and all submaps sub readmap { my $short=shift; $short=~s/^\///; my %cenv=&Apache::lonnet::coursedescription($short); my $fn=$cenv{'fn'}; my $uri; $short=~s/\//\_/g; unless ($uri=$cenv{'url'}) { &Apache::lonnet::logthis("WARNING: ". "Could not load course $short."); return 'No course data available.'; } @cond=('true:normal'); unlink($fn.'.db'); unlink($fn.'_symb.db'); unlink($fn.'.state'); unlink($fn.'parms.db'); $retfurl=''; if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) && (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT,0640))) { %hash=(); %parmhash=(); $errtext=''; $pc=0; loadmap($uri); if (defined($hash{'map_start_'.$uri})) { &traceroute('0',$hash{'map_start_'.$uri},'&'); &accinit($uri,$short,$fn); } unless ((untie(%hash)) && (untie(%parmhash))) { &Apache::lonnet::logthis("WARNING: ". "Could not untie coursemap $fn for $uri."); } { my $cfh; if ($cfh=Apache::File->new(">$fn.state")) { print $cfh join("\n",@cond); } else { &Apache::lonnet::logthis("WARNING: ". "Could not write statemap $fn for $uri."); } } } else { &Apache::lonnet::logthis("WARNING: ". "Could not tie coursemap $fn for $uri."); } &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext); return ($retfurl,$errtext); } # ------------------------------------------------------- Evaluate state string sub evalstate { my $fn=$ENV{'request.course.fn'}.'.state'; my $state='2'; 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'); map { my $line=$_; chomp($line); my ($condition,$weight)=split(/\:/,$_); if ($safeeval->reval($condition)) { if ($weight eq 'force') { $state.='3'; } else { $state.='2'; } } else { if ($weight eq 'stop') { $state.='0'; } else { $state.='1'; } } } @conditions; } &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state); return $state; } 1; __END__