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File:  [LON-CAPA] / loncom / interface / lonmeta.pm
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Sat Oct 21 10:46:35 2000 UTC (23 years, 8 months ago) by www
Branches: MAIN
CVS tags: HEAD
Handler for meta files

    1: # The LearningOnline Network with CAPA
    2: #
    3: # Metadata display handler
    4: #
    5: # (TeX Content Handler
    6: #
    7: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
    8: #
    9: # 10/19,10/21 Gerd Kortemeyer
   10: 
   11: package Apache::lonmeta;
   12: 
   13: use strict;
   14: use Apache::File;
   15: use Apache::Constants qw(:common);
   16: use HTML::TokeParser;
   17: 
   18: 
   19: # ================================================= Unpack metadata into a hash
   20: 
   21: sub unpackagemeta {
   22:     my ($datastring,$fordisplay)=@_;
   23:     my %content=();
   24:     my $parser=HTML::TokeParser->new(\$datastring);
   25:     my $token;
   26:     while ($token=$parser->get_token) {
   27:        if ($token->[0] eq 'S') {
   28: 	   my $entry=$token->[1];
   29:            my $value=$parser->get_text('/'.$entry);
   30:            if (($token->[2]->{'display'}) && ($fordisplay)) {
   31: 	       $value.='__dis__'.$token->[2]->{'display'};
   32:            }
   33:            $content{$entry}=$value;
   34:        }
   35:     }
   36:     return %content;
   37: }
   38: 
   39: # ================================================================ Main Handler
   40: 
   41: sub handler {
   42:   my $r=shift;
   43:   my @metacontents;
   44:   my %content;
   45: 
   46: # ----------------------------------------------------------- Set document type
   47: 
   48:   $r->content_type('text/html');
   49:   $r->send_http_header;
   50: 
   51:   return OK if $r->header_only;
   52: 
   53: # ------------------------------------------------------------------- Read file
   54: 
   55:   {
   56:     my $fh=Apache::File->new($r->filename);
   57:     @metacontents=<$fh>;
   58:   }
   59: 
   60:   %content=&unpackagemeta(join("\n",@metacontents),1);
   61: 
   62: # --------------------------------------------------------------- Render Output
   63:   
   64:   $r->print(<<ENDHEAD);
   65: <html><head><title>Catalog Information</title></head>
   66: <body bgcolor="#FFFFFF">
   67: <h1>Catalog Information</h1>
   68: <h2>$content{'title'}</h2>
   69: <h3>Author(s): $content{'author'}</h3>
   70: <b>Subject:</b> $content{'subject'}<br>
   71: <b>Keyword(s):</b> $content{'keywords'}<br>
   72: <b>Notes:</b> $content{'notes'}<br>
   73: <b>Abstract:</b>
   74: <blockquote>$content{'abstract'}</blockquote>
   75: <hr>
   76: <b>MIME Type:</b> $content{'mime'}<br>
   77: <b>Language:</b> $content{'language'}<br>
   78: <b>Creation Date:</b> $content{'creationdate'}<br>
   79: <b>Last Revision Date:</b> $content{'lastrevisiondate'}<br>
   80: <b>Publisher/Owner:</b> $content{'owner'}<br>
   81: <b>Copyright/Distribution:</b> $content{'copyright'}
   82: <hr>
   83: ENDHEAD
   84:   delete($content{'title'});
   85:   delete($content{'author'});
   86:   delete($content{'subject'});
   87:   delete($content{'keywords'});
   88:   delete($content{'notes'});
   89:   delete($content{'abstract'});
   90:   delete($content{'mime'});
   91:   delete($content{'language'});
   92:   delete($content{'creationdate'});
   93:   delete($content{'lastrevisiondate'});
   94:   delete($content{'owner'});
   95:   delete($content{'copyright'});
   96:   map {
   97:       my ($value,$name)=split(/\_\_dis\_\_/,$content{$_});
   98:       unless ($name) { $name=$_; }
   99:       $r->print('<b>'.$name.':</b> '.$value.'<br>');
  100:   } sort keys %content;
  101:   $r->print('</body></html>');
  102:   return OK;
  103: }
  104: 
  105: 1;
  106: __END__
  107: 
  108: 
  109: 
  110: 
  111: 
  112: 
  113:
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