# 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 Gerd Kortemeyer
package Apache::lonpage;
use strict;
use Apache::Constants qw(:common :http);
use Apache::lonnet();
use GDBM_File;
# -------------------------------------------------------------- Module Globals
my %hash;
my @rows;
my %ssibody=();
my %ssibgcolor=();
my %ssitext=();
my %ssilink=();
my %ssivlink=();
my %ssialink=();
my %cellemb=();
# ------------------------------------------------------------ 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 $further;
}
sub cell {
my ($r,$colspan,$rid)=@_;
$r->print('<td colspan="'.$colspan.'"');
if ($cellemb{$rid} eq 'ssi') {
$r->print('>'.$ssibody{$rid});
} elsif ($cellemb{$rid} eq 'img') {
$r->print('><img src="'.$hash{'src_'.$rid}.'">');
}
$r->print('</td>');
}
# ================================================================ 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 $maxcols=-1;
# --------------------------------------------- Get SSI output, post parameters
for ($i=0;$i<=$#rows;$i++) {
if ($rows[$i]) {
my @colcont=split(/\&/,$rows[$i]);
$maxcols=$#colcont>$maxcols?$#colcont:$maxcols;
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);
$ssibody{$_}=$output;
# ---------------------------------------------------------------- End SSI cell
}
} @colcont;
}
}
if ($maxcols<0) {
$r->content_type('text/html');
$r->send_http_header;
$r->print('<html><body>Empty page.</body></html>');
} else {
# ------------------------------------------------------------------ Build page
$maxcols++;
$r->content_type('text/html');
$r->send_http_header;
$r->print('<html><body>');
$r->print('<table cols="'.$maxcols.'" rows="'.
$#rows.'" border="0">');
for ($i=0;$i<=$#rows;$i++) {
if ($rows[$i]) {
$r->print("\n<tr>");
my @colcont=split(/\&/,$rows[$i]);
my $avespan=int($maxcols/($#colcont+1));
my $lastspan=$maxcols-$avespan*$#colcont;
for ($j=0;$j<$#colcont;$j++) {
&cell($r,$avespan,$colcont[$j]);
}
&cell($r,$lastspan,$colcont[$#colcont]);
$r->print('</tr>');
}
}
$r->print("\n</table>");
$r->print('</body></html>');
# -------------------------------------------------------------------- End page
}
# ------------------------------------------------------------- End render page
} else {
$r->content_type('text/html');
$r->send_http_header;
$r->print('<html><body>Page undefined.</body></html>');
}
# ------------------------------------------------------------------ Untie hash
unless (untie(%hash)) {
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not untie coursemap $fn (browse).</font>");
}
# -------------------------------------------------------------------- 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__
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