--- rat/lonpage.pm	2000/08/31 10:14:08	1.2
+++ rat/lonpage.pm	2005/02/17 09:09:57	1.67
@@ -1,105 +1,560 @@
 # The LearningOnline Network with CAPA
 # Page Handler
 #
-# (TeX Content Handler
+# $Id: lonpage.pm,v 1.67 2005/02/17 09:09:57 albertel Exp $
 #
-# 05/29/00,05/30 Gerd Kortemeyer)
-# 08/30,08/31 Gerd Kortemeyer
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
+#
+###
 
 package Apache::lonpage;
 
 use strict;
 use Apache::Constants qw(:common :http);
 use Apache::lonnet();
+use Apache::loncommon();
+use Apache::lonxml();
+use Apache::lonlocal;
+use Apache::lonmenu;
+use HTML::TokeParser;
 use GDBM_File;
+use Apache::lonsequence;
 
 # -------------------------------------------------------------- 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;
+    my $randomout=0;
+    unless ($ENV{'request.role.adv'}) {
+        $randomout = $hash{'randomout_'.$rid};
+    }
     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}}))) {
-	       $sofar=
-                &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
-                '&'.$hash{'map_finish_'.$hash{'src_'.$rid}}.'&');
-               $sofar++;
-               if (defined($rows[$sofar])) {
-                   $rows[$sofar].='&'.$hash{'map_finish_'.$hash{'src_'.$rid}};
-               } else {
-                   $rows[$sofar]=$hash{'map_finish_'.$hash{'src_'.$rid}};
-               }
-	   }
-       } else {
-           $sofar++;
-           if (defined($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});
-       }
+        $beenhere.=$rid.'&';
+        unless ($randomout) {
+            if (defined($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})) {
+	    my $mincond=1;
+            my $next='';
+            foreach (split(/\,/,$hash{'to_'.$rid})) {
+                my $thiscond=
+      &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
+                if ($thiscond>=$mincond) {
+		    if ($next) {
+		        $next.=','.$_.':'.$thiscond;
+                    } else {
+                        $next=$_.':'.$thiscond;
+		    }
+                    if ($thiscond>$mincond) { $mincond=$thiscond; }
+	        }
+            }
+            foreach (split(/\,/,$next)) {
+                my ($linkid,$condval)=split(/\:/,$_);
+                if ($condval>=$mincond) {
+                    my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
+                    if ($now>$further) { $further=$now; }
+	        }
+            }
+        }
     }
     return $further;
 }
 
-
 # ================================================================ Main Handler
 
 sub handler {
   my $r=shift;
 
-# ----------------------------------------------------------- Set document type
+# ------------------------------------------- Set document type for header only
 
-  if ($ENV{'browser.mathml'}) {
-    $r->content_type('text/xml');
-  } else {
-    $r->content_type('text/html');
+  if ($r->header_only) {
+       if ($ENV{'browser.mathml'}) {
+           &Apache::loncommon::content_type($r,'text/xml');
+       } else {
+           &Apache::loncommon::content_type($r,'text/html'); 
+       }
+       $r->send_http_header;
+       return OK;
+   }
+  
+   &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+                                          ['forceselect','launch']);
+  my $number_of_columns = 1;
+  my $requrl=$r->uri;  
+  my $target = $ENV{'form.grade_target'};
+#  &Apache::lonnet::logthis("Got a target of $target");
+  if ($target eq 'meta') {
+      &Apache::loncommon::content_type($r,'text/html');
+      $r->send_http_header;
+      return OK;
   }
-  $r->send_http_header;
-
-  return OK if $r->header_only;
-
-  my $requrl=$r->uri;
 # ----------------------------------------------------------------- Tie db file
-  if ($ENV{'request.course.fn'}) {
+  if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
       my $fn=$ENV{'request.course.fn'};
       if (-e "$fn.db") {
-          if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) {
+          if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
 # ------------------------------------------------------------------- Hash tied
               my $firstres=$hash{'map_start_'.$requrl};
               my $lastres=$hash{'map_finish_'.$requrl};
               if (($firstres) && ($lastres)) {
 # ----------------------------------------------------------------- Render page
 
-		  $r->print("<h2>All is cool.</h2>");
-
                   @rows=();
-                  &tracetable(0,$firstres,'&'.$lastres.'&');
-                  $rows[$#rows+1]=''.$lastres;
+
+                  &tracetable(0,$firstres,'&');
+
+# ------------------------------------------------------------ Add to symb list
 
                   my $i;
+                  my %symbhash=();
                   for ($i=0;$i<=$#rows;$i++) {
-                      $r->print($i.' - '.$rows[$i].'<br>');
-                  }
+		     if ($rows[$i]) {
+                        my @colcont=split(/\&/,$rows[$i]);
+                        foreach (@colcont) {
+                           $symbhash{$hash{'src_'.$_}}='';
+		        }
+		     }
+		  }
+                  &Apache::lonnet::symblist($requrl,%symbhash);
+
+# ------------------------------------------------------------------ Page parms
+
+                  my $j;
+                  my $lcm=1;
+                  my $contents=0;
+                  my $nforms=0;
+                  
+                  my %ssibody=();
+                  my %ssibgcolor=();
+                  my %ssitext=();
+                  my %ssilink=();
+                  my %ssivlink=();
+                  my %ssialink=();
+     
+                  my %metalink=();
+
+                  my %cellemb=();
+
+                  my $allscript='';
+                  my $allmeta='';
+
+                  my $isxml=0;
+                  my $xmlheader='';
+                  my $xmlbody='';
 
+# --------------------------------------------- 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));
+                      foreach (@colcont) {
+                          my $src=$hash{'src_'.$_};
+			  my ($extension)=($src=~/\.(\w+)$/);
+			  if ($hash{'encrypted_'.$_}) {
+			      $src=&Apache::lonenc::encrypted($src);
+			  }
+                          $metalink{$_}=$src.'.meta';
+                          $cellemb{$_}=
+			      &Apache::loncommon::fileembstyle($extension);
+                          if ($cellemb{$_} eq 'ssi') {
+# --------------------------------------------------------- This is an SSI cell
+			      my ($mapid,$resid)=split(/\./,$_);
+			      my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$src);
+			      
+			      my $prefix=$_.'_';
+                              my %posthash=('request.prefix' => $prefix,
+					    'symb' => $symb);
+			      if ($ENV{'form.grade_target'} eq 'tex') {
+				  $posthash{'grade_target'}=$ENV{'form.grade_target'};
+				  $posthash{'textwidth'}=$ENV{'form.textwidth'};
+				  $posthash{'problem_split'}=$ENV{'form.problem_split'};
+				  $posthash{'latex_type'}=$ENV{'form.latex_type'};
+				  $posthash{'rndseed'}=$ENV{'form.rndseed'};
+			      }
+                              if (($ENV{'form.'.$prefix.'submit'}) 
+                               || ($ENV{'form.all_submit'})) {
+                               foreach (keys %ENV) {
+				  if ($_=~/^form.$prefix/) {
+				      my $name=$_;
+                                      $name=~s/^form.$prefix//;
+                                      $posthash{$name}=$ENV{$_};
+                                  }
+                               }
+			      }
+                              my $output=Apache::lonnet::ssi($src,%posthash);
+			      $output=~s|//(\s*<!--)? BEGIN LON-CAPA Internal.+// END LON-CAPA Internal\s*(-->)?\s||gs;
+                              if ($target eq 'tex') {
+				  $output =~ s/^([^&]+)\\begin{document}//;
+				  $output =~ s/\\end{document}//;
+				  $output = '\parbox{\minipagewidth}{ '.$output.' }';
+                                  #some additional cleanup necessary for LateX (due to limitations of table environment 
+				  $output =~ s/(\\vskip\s*\d+mm)\s*(\\\\)+/$1/g;
+			      }
+                              my $parser=HTML::TokeParser->new(\$output);
+                              my $token;
+                              my $thisdir=$src;
+                              my $bodydef=0;
+                              my $thisxml=0;
+                              my @rlinks=();
+                              if ($output=~/\?xml/) {
+                                 $isxml=1;
+                                 $thisxml=1;
+                                 $output=~
+         /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
+                                 $xmlheader=$1;
+			      }
+                              while ($token=$parser->get_token) {
+				if ($token->[0] eq 'S') {
+                                  if ($token->[1] eq 'a') {
+				      if ($token->[2]->{'href'}) {
+                                         $rlinks[$#rlinks+1]=
+					     $token->[2]->{'href'};
+				      }
+				  } elsif ($token->[1] eq 'img') {
+                                         $rlinks[$#rlinks+1]=
+					     $token->[2]->{'src'};
+				  } elsif ($token->[1] eq 'embed') {
+                                         $rlinks[$#rlinks+1]=
+					     $token->[2]->{'src'};
+				  } elsif ($token->[1] eq 'base') {
+				      $thisdir=$token->[2]->{'href'};
+				  } elsif ($token->[1] eq 'body') {
+				      $bodydef=1;
+                                      $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
+                                      $ssitext{$_}=$token->[2]->{'text'};
+                                      $ssilink{$_}=$token->[2]->{'link'};
+                                      $ssivlink{$_}=$token->[2]->{'vlink'};
+                                      $ssialink{$_}=$token->[2]->{'alink'};
+                                      if ($thisxml) {
+					  $xmlbody=$token->[4];
+                                      }
+                                  } elsif ($token->[1] eq 'meta') {
+				    if ($token->[4] !~ m:/>$:) {
+				      $allmeta.="\n".$token->[4].'</meta>';
+				    } else {
+				      $allmeta.="\n".$token->[4];
+				    }
+                                  } elsif (($token->[1] eq 'script') &&
+                                           ($bodydef==0)) {
+				      $allscript.="\n\n"
+                                                .$parser->get_text('/script');
+                                  }
+			        }
+			      }
+                              if ($output=~/\<body[^\>]*\>(.*)/si) {
+                                 $output=$1; 
+                              }
+                              $output=~s/\<\/body\>.*//si;
+                              if ($output=~/\<form/si) {
+				  $nforms++;
+                                  $output=~s/\<form[^\>]*\>//gsi;
+                                  $output=~s/\<\/form[^\>]*\>//gsi;
+                                  $output=~
+				      s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
+                              }
+                              $thisdir=~s/\/[^\/]*$//;
+			      foreach (@rlinks) {
+				  unless (($_=~/^http:\/\//i) ||
+					  ($_=~/^\//) ||
+					  ($_=~/^javascript:/i) ||
+					  ($_=~/^mailto:/i) ||
+					  ($_=~/^\#/)) {
+				      my $newlocation=
+				    &Apache::lonnet::hreflocation($thisdir,$_);
+                     $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
+				  }
+			      }
+# -------------------------------------------------- Deal with Applet codebases
+  $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
+			      $ssibody{$_}=$output;
+# ---------------------------------------------------------------- End SSI cell
+                          }
+                      }
+                     } 
+                  }
+                  unless ($contents) {
+                      &Apache::loncommon::content_type($r,'text/html');
+                      $r->send_http_header;
+                      $r->print('<html>'."\n".
+                                '<head>'."\n".
+                                &Apache::lonmenu::registerurl(1,undef)."\n".
+                                '</head>'."\n".
+                                '<body bgcolor="#FFFFFF" onLoad="'
+                                .&Apache::lonmenu::loadevents.
+                                '" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
+                                 &Apache::lonmenu::menubuttons(undef,$target,1)
+                               );
+                      $r->print(&mt('This page is either empty or it only contains resources that are currently hidden').'. ');
+                      $r->print('<br /><br />'.&mt('Please use the LON-CAPA navigation arrows to move to another item in the course').'.</body></html>');
+                  } else {
+# ------------------------------------------------------------------ Build page
+
+# ---------------------------------------------------------------- Send headers
+		      unless ($target eq 'tex') {
+			  if ($isxml) {
+			      &Apache::loncommon::content_type($r,'text/xml');
+			      $r->send_http_header;
+			      $r->print($xmlheader);
+			  } else {
+			      &Apache::loncommon::content_type($r,'text/html');
+			      $r->send_http_header;
+			      $r->print('<html>');
+			  }
+# ------------------------------------------------------------------------ Head
+			  $r->print("\n<head>\n".$allmeta);
+			  if ($allscript) {
+			      $r->print("\n<script language='JavaScript'>\n".
+					$allscript."\n</script>\n");
+			  }
+			  $r->print(&Apache::lonmenu::registerurl(1,undef));
+			  $r->print("\n</head>\n");
+# ------------------------------------------------------------------ Start body
+			  if ($isxml) {
+			      $r->print($xmlbody);
+			  } else {
+			      $r->print(
+               '<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonmenu::loadevents.
+               '" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
+                              &Apache::lonmenu::menubuttons(undef,$target,1)
+					);
+			  }
+# ------------------------------------------------------------------ Start form
+			  if ($nforms) {
+			      $r->print('<form method="post" action="'.
+					&Apache::lonenc::check_encrypt($requrl)
+					.'">');
+			  }
+		      } elsif ($target eq 'tex') {
+			  $r->print('\documentclass{article}
+                                 \newcommand{\keephidden}[1]{}           
+                                 \usepackage[dvips]{graphicx}
+                                 \usepackage{epsfig}
+                                 \usepackage{calc}
+                                 \usepackage{longtable}
+                                 \begin{document}');
+		      }
+# ----------------------------------------------------------------- Start table
+		      if ($target eq 'tex') {
+			  $r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
+			  if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
+		      } else {
+			  $r->print('<table width="100%" cols="'.$lcm.'" border="0">');
+		      }
+                      for ($i=0;$i<=$#rows;$i++) {
+			if ($rows[$i]) {
+			    unless ($target eq 'tex') {
+				$r->print("\n<tr>");
+			    }
+                          my @colcont=split(/\&/,$rows[$i]);
+                          my $avespan=$lcm/($#colcont+1);
+                          for ($j=0;$j<=$#colcont;$j++) {
+                              my $rid=$colcont[$j];
+                              my $metainfo = '';
+			      my $esrc=&Apache::lonnet::declutter($hash{'src_'.$rid});
+			      my ($mapid,$resid)=split(/\./,$rid);
+			      my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
+			      if ($hash{'encrypted_'.$rid}) {
+				  $symb=&Apache::lonenc::encrypted($symb);
+				  $esrc=&Apache::lonenc::encrypted($esrc);
+			      }
+                              unless ($hash{'src_'.$rid} =~ m-^/uploaded/-) { 
+                                  $metainfo ='<a name="'.&Apache::lonnet::escape($symb).'" />'.
+                                  '<a href="'.$metalink{$rid}.'" target="LONcatInfo">'.
+                                  '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
+                                  '</img></a>';
+                              }
+                              $metainfo .= '<a href="/adm/evaluate?postdata='.
+				  &Apache::lonnet::escape($esrc).
+                                  '" target="LONcatInfo">'.
+                                  '<img src="/adm/lonMisc/eval_button.gif" border=0>'.
+                                  '</img></a>';
+                              if (
+ ($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
+ (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'})) && 
+ ($hash{'src_'.$rid} !~ m-^/uploaded/-)) {
+				  my ($mapid,$resid)=split(/\./,$rid);
+                                 my $symb=
+                &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
+                '___'.$resid.'___'.
+		&Apache::lonnet::declutter($hash{'src_'.$rid});
+                                 $metainfo.=
+                  '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
+#                 '&command=submission" target="LONcatInfo">'.
+                  '&command=submission">'.
+                          '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
+			  '</img></a>'.
+                  '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
+#                  '&command=gradingmenu" target="LONcatInfo">'.
+                  '&command=gradingmenu">'.
+                          '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
+			  '</img></a>'.
+                  '<a href="/adm/parmset?symb='.&Apache::lonnet::escape($symb).
+#                          '" target="LONcatInfo">'.
+                          '" >'.
+                          '<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
+			      '</img></a>';
+                              }
+                              $metainfo.='<br></br>';
+			    unless ($target eq 'tex') {
+				$r->print('<td colspan="'.$avespan.'"');
+			    }
+                              if ($cellemb{$rid} eq 'ssi') {
+				  unless ($target eq 'tex') {
+				      if ($ssibgcolor{$rid}) {
+					  $r->print(' bgcolor="'.
+						    $ssibgcolor{$rid}.'"');
+				      }
+				      $r->print('>'.$metainfo.'<font');
+		    
+				      if ($ssitext{$rid}) {
+					  $r->print(' text="'.$ssitext{$rid}.'"');
+				      }
+				      if ($ssilink{$rid}) {
+					  $r->print(' link="'.$ssilink{$rid}.'"');
+				      }
+				      if ($ssitext{$rid}) {
+					  $r->print(' vlink="'.$ssivlink{$rid}.'"');
+				      }
+				      if ($ssialink{$rid}) {
+					  $r->print(' alink="'.$ssialink{$rid}.'"');
+				      }             
+				      $r->print('>');
+				  }
+                                  $r->print($ssibody{$rid});	
+				  unless ($target eq 'tex') {
+				      $r->print('</font>');
+                                  }
+                                  if ($ENV{'course.'.
+                                      $ENV{'request.course.id'}.
+                                      '.pageseparators'} eq 'yes') {
+                                      unless($target eq 'tex') {
+                                          $r->print('<hr />');
+                                      } else {
+                                          $r->print('\hline');
+                                      }
+				  }
+			      } elsif ($cellemb{$rid} eq 'img') {
+                                  $r->print('>'.$metainfo.'<img src="'.
+                                    $hash{'src_'.$rid}.'"></img>');
+			      } elsif ($cellemb{$rid} eq 'emb') {
+                                  $r->print('>'.$metainfo.'<embed src="'.
+                                    $hash{'src_'.$rid}.'"></embed>');
+                              } elsif (&Apache::lonnet::declutter($hash{'src_'.$rid}) !~/\.(sequence|page)$/) {
+                                  $r->print($metainfo.'<b>'.$hash{'title_'.$rid}.'</b><br />'.
+                                  &mt('It is recommended that you use an up-to-date virus scanner before handling this file.').'</p><p><table>'.
+                                  &Apache::londocs::entryline(0,&mt("Click to download or use your browser's Save Link function"),'/'.&Apache::lonnet::declutter($hash{'src_'.$rid})).'</table></p><br />');
+                              }
+			      unless ($target eq 'tex') {
+				  $r->print('</td>');
+			      } else {
+                                  for (my $incol=1;$incol<=$avespan;$incol++) {
+				      $r->print(' & ');
+				  }
+			      }
+                          }
+			      unless ($target eq 'tex') {
+				  $r->print('</tr>');
+			      } else {
+				  $r->print('REMOVETHEHEADOFLONGTABLE\\\\');
+			      }
+		        }
+                      }
+		      unless ($target eq 'tex') {
+			  $r->print("\n</table>");
+		      } else {
+			  $r->print('\end{longtable}\strut');
+		      }
+# ---------------------------------------------------------------- Submit, etc.
+                      if ($nforms) {
+                          $r->print(
+	                  '<input name="all_submit" value="Submit All" type="'.
+			  (($nforms>1)?'submit':'hidden').'"></input></form>');
+                      }
+		      unless ($target eq 'tex') {
+			  $r->print('</body>'.&Apache::lonxml::xmlend());
+		      } else {
+			  $r->print('\end{document}'.$number_of_columns);
+		      }
+		      &Apache::lonnet::symblist($requrl,%symbhash);
+# -------------------------------------------------------------------- End page
+                  }                  
 # ------------------------------------------------------------- End render page
               } else {
-		  $r->print("<h2>Page undefined.</h2>");
+                  &Apache::loncommon::content_type($r,'text/html');
+                  $r->send_http_header;
+                  &Apache::lonsequence::viewmap($r,$requrl);
               }
 # ------------------------------------------------------------------ Untie hash
               unless (untie(%hash)) {
@@ -112,15 +567,114 @@ sub handler {
           }
       } 
   }
-  $ENV{'user.error.msg'}="$requrl:bre:1:1:Course not initialized";
-  return HTTP_NOT_ACCEPTABLE; 
+  &Apache::loncommon::content_type($r,'text/html');
+  $r->send_http_header;
+  &Apache::lonsequence::viewmap($r,$requrl);
+  return OK; 
 }
 
 1;
 __END__
 
+=head1 NAME
+
+Apache::lonpage - Page Handler
+
+=head1 SYNOPSIS
+
+Invoked by /etc/httpd/conf/srm.conf:
+
+ <LocationMatch "^/res/.*\.page$>
+ SetHandler perl-script
+ PerlHandler Apache::lonpage
+ </LocationMatch>
+
+=head1 INTRODUCTION
+
+This module renders a .page resource.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 HANDLER SUBROUTINE
+
+This routine is called by Apache and mod_perl.
+
+=over 4
+
+=item *
+
+set document type for header only
+
+=item *
+
+tie db file
+
+=item *
+
+render page
+
+=item *
+
+add to symb list
+
+=item *
+
+page parms
+
+=item *
+
+Get SSI output, post parameters
+
+=item *
+
+SSI cell rendering
+
+=item *
+
+Deal with Applet codebases
+
+=item *
+
+Build page
+
+=item *
+
+send headers
+
+=item *
+
+start body
+
+=item *
+
+start form
+
+=item *
+
+start table
+
+=item *
+
+submit element, etc, render page, untie hash
+
+=back
+
+=head1 OTHER SUBROUTINES
+
+=over 4
+
+=item *
+
+euclid() : Euclid's method for determining the greatest common denominator.
+
+=item *
+
+tracetable() : Build page table.
 
+=back
 
+=cut