# The LearningOnline Network with CAPA # Page Handler # # (TeX Content Handler # # 05/29/00,05/30 Gerd Kortemeyer) # 08/30,08/31,09/06,09/14,09/15,09/16 Gerd Kortemeyer package Apache::lonpage; use strict; use Apache::Constants qw(:common :http); use Apache::lonnet(); use HTML::TokeParser; use GDBM_File; # -------------------------------------------------------------- Module Globals my %hash; my @rows; # ------------------------------------------------------------------ Euclid gcd sub euclid { my ($e,$f)=@_; my $a; my $b; my $r; if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; } while ($r!=0) { $a=$b; $b=$r; $r=$a%$b; } return $b; } # ------------------------------------------------------------ Build page table sub tracetable { my ($sofar,$rid,$beenhere)=@_; my $further=$sofar; unless ($beenhere=~/\&$rid\&/) { $beenhere.=$rid.'&'; if (defined($hash{'is_map_'.$rid})) { if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) && (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) { my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}}; $sofar= &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}}, '&'.$frid.'&'); $sofar++; if ($hash{'src_'.$frid}) { my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid}); if (($brepriv eq '2') || ($brepriv eq 'F')) { if (defined($rows[$sofar])) { $rows[$sofar].='&'.$frid; } else { $rows[$sofar]=$frid; } } } } } else { $sofar++; if ($hash{'src_'.$rid}) { my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid}); if (($brepriv eq '2') || ($brepriv eq 'F')) { if (defined($rows[$sofar])) { $rows[$sofar].='&'.$rid; } else { $rows[$sofar]=$rid; } } } } if (defined($hash{'to_'.$rid})) { map { my $now=&tracetable($sofar,$hash{'goesto_'.$_},$beenhere); if ($now>$further) { $further=$now; } } split(/\,/,$hash{'to_'.$rid}); } } return $further; } # ================================================================ Main Handler sub handler { my $r=shift; # ------------------------------------------- Set document type for header only if ($r->header_only) { if ($ENV{'browser.mathml'}) { $r->content_type('text/xml'); } else { $r->content_type('text/html'); } $r->send_http_header; return OK; } my $requrl=$r->uri; # ----------------------------------------------------------------- Tie db file if ($ENV{'request.course.fn'}) { my $fn=$ENV{'request.course.fn'}; if (-e "$fn.db") { if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) { # ------------------------------------------------------------------- Hash tied my $firstres=$hash{'map_start_'.$requrl}; my $lastres=$hash{'map_finish_'.$requrl}; if (($firstres) && ($lastres)) { # ----------------------------------------------------------------- Render page @rows=(); &tracetable(0,$firstres,'&'.$lastres.'&'); if ($hash{'src_'.$lastres}) { my $brepriv= &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres}); if (($brepriv eq '2') || ($brepriv eq 'F')) { $rows[$#rows+1]=''.$lastres; } } my $i; my $j; my $lcm=1; my $contents=0; my %ssibody=(); my %ssibgcolor=(); my %ssitext=(); my %ssilink=(); my %ssivlink=(); my %ssialink=(); my %cellemb=(); # --------------------------------------------- Get SSI output, post parameters for ($i=0;$i<=$#rows;$i++) { if ($rows[$i]) { $contents++; my @colcont=split(/\&/,$rows[$i]); $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1)); map { my $src=$hash{'src_'.$_}; $src=~/\.(\w+)$/; $cellemb{$_}=Apache::lonnet::fileembstyle($1); if ($cellemb{$_} eq 'ssi') { # --------------------------------------------------------- This is an SSI cell my $prefix=$_.'_'; my %posthash=('request.prefix' => $prefix); map { if ($_=~/^form.$prefix/) { my $name=$_; $name=~s/^form.$prefix//; $posthash{$name}=$ENV{$_}; } } keys %ENV; my $output=Apache::lonnet::ssi($src,%posthash); my $parser=HTML::TokeParser->new(\$output); my $token; my $bodydef=0; while (($bodydef==0) && ($token=$parser->get_token)) { if ($token->[1] eq 'body') { $bodydef=1 } if ($token->[1] eq 'meta') { } if ($token->[1] eq 'script') { } if ($token->[1] eq 'basefont') { } } if ($output=~/\]*\>(.*)/si) { $output=$1; } $output=~s/\<\/body\>.*//si; $ssibody{$_}=$output; # ---------------------------------------------------------------- End SSI cell } } @colcont; } } unless ($contents) { $r->content_type('text/html'); $r->send_http_header; $r->print('Empty page.'); } else { # ------------------------------------------------------------------ Build page $r->content_type('text/html'); $r->send_http_header; $r->print(''); $r->print(''); for ($i=0;$i<=$#rows;$i++) { if ($rows[$i]) { $r->print("\n"); my @colcont=split(/\&/,$rows[$i]); my $avespan=$lcm/($#colcont+1); for ($j=0;$j<=$#colcont;$j++) { my $rid=$colcont[$j]; $r->print(''); } $r->print(''); } } $r->print("\n
print('>'.$ssibody{$rid}); } elsif ($cellemb{$rid} eq 'img') { $r->print('>'); } $r->print('
"); $r->print(''); # -------------------------------------------------------------------- End page } # ------------------------------------------------------------- End render page } else { $r->content_type('text/html'); $r->send_http_header; $r->print('Page undefined.'); } # ------------------------------------------------------------------ Untie hash unless (untie(%hash)) { &Apache::lonnet::logthis("WARNING: ". "Could not untie coursemap $fn (browse)."); } # -------------------------------------------------------------------- All done return OK; # ----------------------------------------------- Errors, hash could no be tied } } } $ENV{'user.error.msg'}="$requrl:bre:1:1:Course not initialized"; return HTTP_NOT_ACCEPTABLE; } 1; __END__