# The LearningOnline Network with CAPA
# 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 Gerd Kortemeyer
package Apache::lonratsrv;
use strict;
use Apache::Constants qw(:common);
use Apache::File;
use HTML::TokeParser;
# ---------------------------------------------------------- Escape Quote Chars
sub qtescape {
my $str=shift;
$str =~ s/([\"\%])/"%".unpack('H2',$1)/eg;
return $str;
}
# ----------------------------------------------------- Un-Escape Special Chars
sub unescape {
my $str=shift;
$str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
return $str;
}
# --------------------------------------------------------- Loads map from disk
sub loadmap {
my ($fn,$errtext)=@_;
my $outstr='';
my @content=();
my @obj=();
my @links=();
if (-e $fn) {
{
my $fh=Apache::File->new($fn);
@content=<$fh>;
}
my $instr=join('',@content);
my $parser = HTML::TokeParser->new(\$instr);
my $token;
my $graphmode=0;
$fn=~/\.(\w+)$/;
$outstr="mode<:>$1";
while ($token = $parser->get_token) {
if ($token->[0] eq 'S') {
if ($token->[1] eq 'map') {
$graphmode=($token->[2]->{'mode'} eq 'rat/graphical');
} elsif ($token->[1] eq 'resource') {
} elsif ($token->[1] eq 'condition') {
} elsif ($token->[1] eq 'link') {
$outstr.='<&>objlinks';
if ($graphmode) {
$outstr.='<:>'.$token->[2]->{'index'};
@links[$token->[2]->{'index'}]=1;
} else {
my $i=1;
while (($i<=$#links) && ($links[$i]==1)) { $i++; }
$outstr.='<:>'.$i;
}
$outstr.='<:>'.$token->[2]->{'from'}.
'<:>'.$token->[2]->{'to'};
if ($token->[2]->{'condition'}) {
$outstr.='<:>'.$token->[2]->{'condition'};
} else {
$outstr.='<:>0';
}
} elsif ($graphmode) {
}
}
}
} else {
$errtext.='Map not loaded: The file does not exist.';
}
return($outstr,$errtext);
}
# ----------------------------------------------------------- Saves map to disk
sub savemap {
my ($fn,$errtext)=@_;
if (($fn=~/\.course$/) ||
($fn=~/\.sequence$/) ||
($fn=~/\.page$/)) {
# ------------------------------------------------------------- Deal with input
my @tags=split(/<&>/,$ENV{'form.output'});
my $outstr='';
my $graphdef=0;
if ($tags[0] eq 'graphdef<:>yes') {
$outstr='<map mode="rat/graphical">'."\n";
$graphdef=1;
} else {
$outstr="<map>\n";
}
map {
my @parts=split(/<:>/,$_);
if ($parts[0] eq 'objcont') {
my @comp=split(/:/,$parts[$#parts]);
# --------------------------------------------------------------- Logical input
if ($comp[$#comp] eq 'res') {
$comp[0]=~s/\&\#(\d+)\;/pack("C",$1)/eg;
$comp[1]=~s/\&\#(\d+)\;/pack("C",$1)/eg;
if ($comp[2] eq 'true') {
if ($comp[1]!~/^http\:\/\//) {
$comp[1]='http://'.$comp[1];
}
} else {
if ($comp[1]=~/^http\:\/\//) {
$comp[1]=~s/^http\:\/\/[^\/]*\//\//;
}
}
$outstr.='<resource id="'.$parts[1].'" src="'
.qtescape($comp[1]).'"';
if (($comp[3] ne '') && ($comp[3] ne 'normal')) {
$outstr.=' type="'.$comp[3].'"';
}
if ($comp[0] ne '') {
$outstr.=' title="'.qtescape($comp[0]).'"';
}
$outstr.="></resource>\n";
} elsif ($comp[$#comp] eq 'cond') {
$outstr.='<condition id="'.$parts[1].'"';
if (($comp[1] ne '') && ($comp[1] ne 'normal')) {
$outstr.=' type="'.$comp[1].'"';
}
$outstr.=' value="'.qtescape($comp[0]).'"';
$outstr.="></condition>\n";
}
} elsif ($parts[0] eq 'objlinks') {
my @comp=split(/:/,$parts[$#parts]);
$outstr.='<link';
$outstr.=' from="'.$comp[0].'"';
$outstr.=' to="'.$comp[1].'"';
if (($comp[2] ne '') && ($comp[2]!=0)) {
$outstr.=' condition="'.$comp[2].'"';
}
$outstr.=' index="'.$parts[1].'"';
$outstr.="></link>\n";
} elsif (($parts[0] ne '') && ($graphdef)) {
# ------------------------------------------------------------- Graphical input
$outstr.='<'.$parts[0];
if ($#parts==2) {
$outstr.=' index="'.$parts[1].'"';
}
$outstr.=' value="'.qtescape($parts[$#parts]).'"></'.
$parts[0].">\n";
}
} @tags;
$outstr.="</map>\n";
{
my $fh;
if ($fh=Apache::File->new(">$fn")) {
print $fh $outstr;
$errtext.="Map saved as $fn.";
} else {
$errtext.='Could not write file $fn. Map not saved.';
}
}
} else {
# -------------------------------------------- Cannot write to that file, error
$errtext.='Map not saved: The specified path does not exist.';
}
return $errtext;
}
# ================================================================ Main Handler
sub handler {
my $r=shift;
$r->content_type('text/html');
$r->send_http_header;
return OK if $r->header_only;
my $url=$r->uri;
$url=~/\/(\w+)\/ratserver$/;
my $mode=$1;
$url=~s/\/loadonly\/ratserver$/\/save\/ratserver/;
my $fn=$r->filename;
my $errtext='';
my $outtext='';
if ($mode ne 'loadonly') {
$errtext=&savemap($fn,$errtext);
}
($outtext,$errtext)=&loadmap($fn,$errtext);
$r->print(<<ENDDOCUMENT);
<html>
<body bgcolor="#FFFFFF">
<form name=storage method=post action="$url">
<input type=hidden name=output value="$outtext">
</form>
ENDDOCUMENT
if ($errtext ne '') {
$r->print(<<ENDSCRIPT);
<script>
alert("$errtext");
</script>
ENDSCRIPT
}
$r->print("</body>\n</html>\n");
return OK;
}
1;
__END__
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