--- rat/lonpage.pm	2000/10/02 21:33:40	1.10
+++ rat/lonpage.pm	2002/07/01 15:02:19	1.43
@@ -1,19 +1,54 @@
 # The LearningOnline Network with CAPA
 # Page Handler
 #
+# $Id: lonpage.pm,v 1.43 2002/07/01 15:02:19 sakharuk Exp $
+#
+# 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/
+#
 # (TeX Content Handler
 #
+# YEAR=2000
 # 05/29/00,05/30 Gerd Kortemeyer)
 # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
-# 10/02 Gerd Kortemeyer
+# 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16,
+# YEAR=2001
+# 08/13/01,08/30,10/1 Gerd Kortemeyer
+# 12/16 Scott Harrison
+# YEAR=2002
+# 03/19 Gerd Kortemeyer
+#
+###
 
 package Apache::lonpage;
 
 use strict;
 use Apache::Constants qw(:common :http);
 use Apache::lonnet();
+use Apache::loncommon();
+use Apache::lonxml();
 use HTML::TokeParser;
 use GDBM_File;
+use Apache::lonsequence;
 
 # -------------------------------------------------------------- Module Globals
 my %hash;
@@ -74,10 +109,28 @@ sub tracetable {
        }
 
        if (defined($hash{'to_'.$rid})) {
-          map {
-              my $now=&tracetable($sofar,$hash{'goesto_'.$_},$beenhere);
-              if ($now>$further) { $further=$now; }
-          } split(/\,/,$hash{'to_'.$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 $further;
@@ -94,15 +147,19 @@ sub handler {
        if ($ENV{'browser.mathml'}) {
            $r->content_type('text/xml');
        } else {
-           $r->content_type('text/html');
+           $r->content_type('text/html'); 
        }
        $r->send_http_header;
        return OK;
    }
-
-  my $requrl=$r->uri;
+  
+   &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+                                          ['forceselect','launch']);
+  my $number_of_columns = 1;
+  my $requrl=$r->uri;  
+  my $target = $ENV{'form.grade_target'};
 # ----------------------------------------------------------------- Tie db file
-  if ($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_READER,0640)) {
@@ -130,9 +187,9 @@ sub handler {
                   for ($i=0;$i<=$#rows;$i++) {
 		     if ($rows[$i]) {
                         my @colcont=split(/\&/,$rows[$i]);
-                        map {
+                        foreach (@colcont) {
                            $symbhash{$hash{'src_'.$_}}='';
-		        } @colcont;
+		        }
 		     }
 		  }
                   &Apache::lonnet::symblist($requrl,%symbhash);
@@ -150,6 +207,9 @@ sub handler {
                   my %ssilink=();
                   my %ssivlink=();
                   my %ssialink=();
+     
+                  my %metalink=();
+
                   my %cellemb=();
 
                   my $allscript='';
@@ -166,29 +226,32 @@ sub handler {
 		      $contents++;
                       my @colcont=split(/\&/,$rows[$i]);
                       $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
-                      map {
+                      foreach (@colcont) {
                           my $src=$hash{'src_'.$_};
                           $src=~/\.(\w+)$/;
-                          $cellemb{$_}=Apache::lonnet::fileembstyle($1);
+                          $metalink{$_}=$src.'.meta';
+                          $cellemb{$_}=Apache::loncommon::fileembstyle($1);
                           if ($cellemb{$_} eq 'ssi') {
 # --------------------------------------------------------- This is an SSI cell
 			      my $prefix=$_.'_';
                               my %posthash=('request.prefix' => $prefix);
                               if (($ENV{'form.'.$prefix.'submit'}) 
                                || ($ENV{'form.all_submit'})) {
-                               map {
+                               foreach (keys %ENV) {
 				  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 $thisdir=$src;
                               my $bodydef=0;
                               my $thisxml=0;
+                              my @rlinks=();
                               if ($output=~/\?xml/) {
                                  $isxml=1;
                                  $thisxml=1;
@@ -196,9 +259,22 @@ sub handler {
          /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
                                  $xmlheader=$1;
 			      }
-                              while (($bodydef==0) &&
-                                     ($token=$parser->get_token)) {
-				  if ($token->[1] eq 'body') {
+                              while ($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'};
                                       $ssitext{$_}=$token->[2]->{'text'};
@@ -208,15 +284,19 @@ sub handler {
                                       if ($thisxml) {
 					  $xmlbody=$token->[4];
                                       }
-                                  }
-                                  if ($token->[1] eq 'meta') {
+                                  } elsif ($token->[1] eq 'meta') {
+				    if ($token->[4] !~ m:/>$:) {
 				      $allmeta.="\n".$token->[4].'</meta>';
-                                  }
-                                  if ($token->[1] eq 'script') {
+				    } 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; 
                               }
@@ -225,12 +305,27 @@ sub handler {
 				  $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;
 			      $ssibody{$_}=$output;
-
 # ---------------------------------------------------------------- End SSI cell
                           }
-                      } @colcont;
+                      }
                      } 
                   }
                   unless ($contents) {
@@ -241,86 +336,176 @@ sub handler {
 # ------------------------------------------------------------------ Build page
 
 # ---------------------------------------------------------------- Send headers
-                      if ($isxml) {
-			  $r->content_type('text/xml');
-                          $r->send_http_header;
-                          $r->print($xmlheader);
-		      } else {
-                          $r->content_type('text/html');
-                          $r->send_http_header;
-                          $r->print('<html>');
-		      }
+		      unless ($target eq 'tex') {
+			  if ($isxml) {
+			      $r->content_type('text/xml');
+			      $r->send_http_header;
+			      $r->print($xmlheader);
+			  } else {
+			      $r->content_type('text/html');
+			      $r->send_http_header;
+			      $r->print('<html>');
+			  }
 # ------------------------------------------------------------------------ Head
-                      $r->print("\n<head>\n".$allmeta);
-                      if ($allscript) {
-			  $r->print("\n<script>\n".$allscript."\n</script>\n");
-                      }
-                      $r->print("\n</head>\n");
+			  $r->print("\n<head>\n".$allmeta);
+			  $allscript=~
+			      s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
+			  if ($allscript) {
+			      $r->print("\n<script language='JavaScript'>\n".
+					$allscript."\n</script>\n");
+			  }
+			  $r->print(&Apache::lonxml::registerurl(1,undef));
+			  $r->print("\n</head>\n");
 # ------------------------------------------------------------------ Start body
-                      if ($isxml) {
-                          $r->print($xmlbody);
-                      } else {
-			  $r->print('<body bgcolor="#FFFFFF">');
-                      }
+			  if ($isxml) {
+			      $r->print($xmlbody);
+			  } else {
+			      $r->print('<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonxml::loadevents.'" onUnload="'.&Apache::lonxml::unloadevents.'">');
+			  }
 # ------------------------------------------------------------------ Start form
-                      if ($nforms) {
-			  $r->print('<form method="post" action="'.
-				    $requrl.'">');
-                      }
+			  if ($nforms) {
+			      $r->print('<form method="post" action="'.
+					$requrl.'">');
+			  }
+		      } else {
+			  $r->print('\documentclass[letterpaper]{article}
+                                 \newcommand{\keephidden}[1]{}           
+                                 \usepackage[dvips]{graphicx}
+                                 \usepackage{epsfig}
+                                 \usepackage{calc}
+                                 \usepackage{longtable}
+                                 \begin{document}');
+		      }
 # ----------------------------------------------------------------- Start table
-                      $r->print('<table cols="'.$lcm.'" border="0">');
+		      if ($target eq 'tex') {
+			  $r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
+			  if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
+		      } else {
+			  $r->print('<table cols="'.$lcm.'" border="0">');
+		      }
                       for ($i=0;$i<=$#rows;$i++) {
 			if ($rows[$i]) {
-                          $r->print("\n<tr>");
+			    unless ($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];
-                              $r->print('<td colspan="'.$avespan.'"');
+                              my $metainfo='<a href="'.
+                                    $metalink{$rid}.'" target="LONcatInfo">'.
+                          '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
+			  '</img></a><a href="/adm/evaluate?postdata='.
+      &Apache::lonnet::escape(&Apache::lonnet::declutter($hash{'src_'.$rid}))
+      .'" 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'}))) {
+				  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">'.
+                          '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
+			  '</img></a>'.
+                  '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
+                  '&command=gradingmenu" target="LONcatInfo">'.
+                          '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
+			  '</img></a>'.
+                  '<a href="/adm/parmset?symb='.&Apache::lonnet::escape($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') {
-				  if ($ssibgcolor{$rid}) {
-                                     $r->print(' bgcolor="'.
-                                               $ssibgcolor{$rid}.'"');
-                                  }
-                                  $r->print('><font');
-                                  if ($ssitext{$rid}) {
-				     $r->print(' text="'.$ssitext{$rid}.'"');
-                                  }
-                                  if ($ssilink{$rid}) {
-				     $r->print(' link="'.$ssilink{$rid}.'"');
+				  unless ($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') {
+				      $r->print('</font>');
                                   }
-                                  if ($ssitext{$rid}) {
-				     $r->print(' vlink="'.$ssivlink{$rid}.'"');
-                                  }
-                                  if ($ssialink{$rid}) {
-				     $r->print(' alink="'.$ssialink{$rid}.'"');
-                                  }
-                            
-                                  $r->print('>'.$ssibody{$rid}.'</font>');
-                              } elsif ($cellemb{$rid} eq 'img') {
-                                  $r->print('><img src="'.
+                                  if ($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>');
+                              }
+			      unless ($target eq 'tex') {
+				  $r->print('</td>');
+			      } else {
+                                  for (my $incol=1;$incol<=$avespan;$incol++) {
+				      $r->print(' & ');
+				  }
 			      }
-                              $r->print('</td>');
                           }
-                          $r->print('</tr>');
+			      unless ($target eq 'tex') {
+				  $r->print('</tr>');
+			      } else {
+				  $r->print('REMOVETHEHEADOFLONGTABLE\\\\');
+			      }
 		        }
                       }
-                      $r->print("\n</table>");
+		      unless ($target eq 'tex') {
+			  $r->print("\n</table>");
+		      } else {
+			  $r->print('\end{longtable}');
+		      }
 # ---------------------------------------------------------------- Submit, etc.
                       if ($nforms) {
                           $r->print(
 	                  '<input name="all_submit" value="Submit All" type="'.
 			  (($nforms>1)?'submit':'hidden').'"></input></form>');
                       }
-                      $r->print('</body></html>');
+		      unless ($target eq 'tex') {
+			  $r->print('</body>'.&Apache::lonxml::xmlend());
+		      } else {
+			  $r->print('\end{document}'.$number_of_columns);
+		      }
 # -------------------------------------------------------------------- End page
                   }                  
 # ------------------------------------------------------------- End render page
               } else {
                   $r->content_type('text/html');
                   $r->send_http_header;
-		  $r->print('<html><body>Page undefined.</body></html>');
+                  &Apache::lonsequence::viewmap($r,$requrl);
               }
 # ------------------------------------------------------------------ Untie hash
               unless (untie(%hash)) {
@@ -333,15 +518,114 @@ sub handler {
           }
       } 
   }
-  $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
-  return HTTP_NOT_ACCEPTABLE; 
+  $r->content_type('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