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Diff for /loncom/homework/lonhomework.pm between versions 1.104 and 1.163

version 1.104, 2002/12/11 14:44:24 version 1.163, 2004/02/13 21:21:30
Line 24 Line 24
 # /home/httpd/html/adm/gpl.txt  # /home/httpd/html/adm/gpl.txt
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  
 # Guy Albertelli  
 # 11/30 Gerd Kortemeyer  
 # 6/1,8/17,8/18 Gerd Kortemeyer  
 # 7/18 Jeremy Bowers  
   
 package Apache::lonhomework;  package Apache::lonhomework;
 use strict;  use strict;
Line 48  use Apache::optionresponse(); Line 44  use Apache::optionresponse();
 use Apache::imageresponse();  use Apache::imageresponse();
 use Apache::essayresponse();  use Apache::essayresponse();
 use Apache::externalresponse();  use Apache::externalresponse();
   use Apache::rankresponse();
   use Apache::matchresponse();
   use Apache::chemresponse();
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common);
 use HTML::Entities();  use HTML::Entities();
 use Apache::loncommon();  use Apache::loncommon();
   use Apache::lonlocal;
 #use Time::HiRes qw( gettimeofday tv_interval );  #use Time::HiRes qw( gettimeofday tv_interval );
   
 BEGIN {  BEGIN {
   &Apache::lonxml::register_insert();      &Apache::lonxml::register_insert();
 }  }
   
 sub get_target {  sub get_target {
   if ( $ENV{'request.state'} eq "published") {      if (($ENV{'request.state'} eq "published") ||
     if ( defined($ENV{'form.grade_target'}  )    ($ENV{'request.state'} eq "uploaded")) {
  && ($ENV{'form.grade_target'} eq 'tex')) {   if ( defined($ENV{'form.grade_target'}  ) 
       return ($ENV{'form.grade_target'});       && ($ENV{'form.grade_target'} eq 'tex')) {
     } elsif ( defined($ENV{'form.grade_target'}  )       return ($ENV{'form.grade_target'});
  && ($Apache::lonhomework::viewgrades == 'F' )) {   } elsif ( defined($ENV{'form.grade_target'}  ) 
       return ($ENV{'form.grade_target'});    && ($Apache::lonhomework::viewgrades eq 'F' )) {
     }      return ($ENV{'form.grade_target'});
     }
     if ( defined($ENV{'form.submitted'})) {  
       return ('grade', 'web');  
     } else {  
       return ('web');  
     }  
   } elsif ($ENV{'request.state'} eq "construct") {  
     if ( defined($ENV{'form.grade_target'}) ) {  
       return ($ENV{'form.grade_target'});  
     }  
     if ( defined($ENV{'form.preview'})) {  
       if ( defined($ENV{'form.submitted'})) {  
  return ('grade', 'web');  
       } else {  
  return ('web');  
       }  
     } else {  
       if ( $ENV{'form.problemmode'} eq 'View' ||  
    $ENV{'form.problemmode'} eq 'Discard Edits and View') {  
  if ( defined($ENV{'form.submitted'}) &&   if ( defined($ENV{'form.submitted'}) &&
      (!defined($ENV{'form.resetdata'})) ) {       ( !defined($ENV{'form.resetdata'})) &&
   return ('grade', 'web','answer');       ( !defined($ENV{'form.newrandomization'}))) {
       return ('grade', 'web');
  } else {   } else {
   return ('web','answer');      return ('web');
    }
       } elsif ($ENV{'request.state'} eq "construct") {
    if ( defined($ENV{'form.grade_target'}) ) {
       return ($ENV{'form.grade_target'});
    }
    if ( defined($ENV{'form.preview'})) {
       if ( defined($ENV{'form.submitted'})) {
    return ('grade', 'web');
       } else {
    return ('web');
       }
    } else {
       if ( $ENV{'form.problemmode'} eq &mt('View') ||
    $ENV{'form.problemmode'} eq &mt('Discard Edits and View')) {
    if ( defined($ENV{'form.submitted'}) &&
        (!defined($ENV{'form.resetdata'})) &&
        (!defined($ENV{'form.newrandomization'}))) {
       return ('grade', 'web','answer');
    } else {
       return ('web','answer');
    }
       } elsif ( $ENV{'form.problemmode'} eq &mt('Edit') ) {
    if ( $ENV{'form.submitted'} eq 'edit' ) {
       if ( $ENV{'form.submit'} eq &mt('Submit Changes and View') ) {
    return ('modified','web','answer');
       } else {
    return ('modified','edit');
       }
    } else {
       return ('edit');
    }
       } else {
    return ('web');
       }
  }   }
       } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {  
  if ( $ENV{'form.submitted'} eq 'edit' ) {  
   if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {  
     return ('modified','web','answer');  
   } else {  
     return ('modified','edit');  
   }  
  } else {  
   return ('edit');  
  }  
       } else {  
  return ('web');  
       }  
     }      }
   }      return ();
   return ();  
 }  }
   
 sub setup_vars {  sub setup_vars {
   my ($target) = @_;      my ($target) = @_;
   return ';'      return ';'
 #  return ';$external::target='.$target.';';  #  return ';$external::target='.$target.';';
 }  }
   
 sub send_header {  sub send_header {
   my ($request)= @_;      my ($request)= @_;
   $request->print(&Apache::lontexconvert::header());      $request->print(&Apache::lontexconvert::header());
 #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');  #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
 }  }
   
 sub createmenu {  sub createmenu {
   my ($which,$request)=@_;      my ($which,$request)=@_;
   if ($which eq 'grade') {      if ($which eq 'grade') {
     $request->print('<script language="JavaScript">    $request->print('<script language="JavaScript"> 
           hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",            hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
                  "height=350,width=150,menubar=no");                   "height=350,width=150,menubar=no");
           </script>');            </script>');
   }      }
 }  }
   
 sub send_footer {  sub send_footer {
   my ($request)= @_;      my ($request)= @_;
 #  $request->print('</form>');  #  $request->print('</form>');
   $request->print(&Apache::lontexconvert::footer());      $request->print(&Apache::lontexconvert::footer());
 }  }
   
 $Apache::lonxml::browse='';  $Apache::lonxml::browse='';
   
   sub check_ip_acc {
       my ($acc)=@_;
       if (!defined($acc) || $acc =~ /^\s*$/) { return 1; }
       my $allowed=0;
       my $ip=$ENV{'REMOTE_ADDR'};
       my $name;
       foreach my $pattern (split(',',$acc)) {
    if ($pattern =~ /\*$/) {
       #35.8.*
       $pattern=~s/\*//;
       if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
    } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {    
       #35.8.3.[34-56]
       my $low=$2;
       my $high=$3;
       $pattern=$1;
       if ($ip =~ /^\Q$pattern\E/) { 
    my $last=(split(/\./,$ip))[3];
    if ($last <=$high && $last >=$low) { $allowed=1; }
       }
    } elsif ($pattern =~ /^\*/) {
       #*.msu.edu
       $pattern=~s/\*//;
       if (!defined($name)) {
    use Socket;
    my $netaddr=inet_aton($ip);
    ($name)=gethostbyaddr($netaddr,AF_INET);
       }
       if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
    } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
       #127.0.0.1
       if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
    } else {
       #some.name.com
       if (!defined($name)) {
    use Socket;
    my $netaddr=inet_aton($ip);
    ($name)=gethostbyaddr($netaddr,AF_INET);
       }
       if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
    }
    if ($allowed) { last; }
       }
       return $allowed;
   }
 # JB, 9/24/2002: Any changes in this function may require a change  # JB, 9/24/2002: Any changes in this function may require a change
 # in lonnavmaps::resource::getDateStatus.  # in lonnavmaps::resource::getDateStatus.
 sub check_access {  sub check_access {
   my ($id) = @_;      my ($id) = @_;
   my $date ='';      my $date ='';
   my $status;      my $status;
   my $datemsg = '';      my $datemsg = '';
   my $lastdate = '';      my $lastdate = '';
   my $temp;      my $temp;
   my $type;      my $type;
   my $passed;      my $passed;
   &Apache::lonxml::debug("checking for part :$id:");  
   &Apache::lonxml::debug("time:".time);      if ($ENV{'request.state'} eq "construct") {
   foreach $temp ("opendate","duedate","answerdate") {   &Apache::lonxml::debug("in construction ignoring dates");
     $lastdate = $date;   $status='CAN_ANSWER';
     $date = &Apache::lonnet::EXT("resource.$id.$temp");   $datemsg=&mt('is in under construction');
     my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");  # return ($status,$datemsg);
     if ($thistype =~ /^(con_lost|no_such_host)/ ||      }
  $date     =~ /^(con_lost|no_such_host)/) {  
  $status='UNAVAILABLE';      &Apache::lonxml::debug("checking for part :$id:");
  $date="may open later.";      &Apache::lonxml::debug("time:".time);
  return($status,$date);  
     }      if ($ENV{'request.state'} ne "construct") {
     if ($thistype eq 'date_interval') {   my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
  if ($temp eq 'opendate') {   if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
            $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;      $status='INVALID_ACCESS';
         }      $date=&mt("can not be accessed from your location.");
         if ($temp eq 'answerdate') {      return($status,$date);
            $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;   }
         }  
     }   foreach $temp ("opendate","duedate","answerdate") {
     &Apache::lonxml::debug("found :$date: for :$temp:");      $lastdate = $date;
     if ($date eq '') {      $date = &Apache::lonnet::EXT("resource.$id.$temp");
       $date = "an unknown date"; $passed = 0;      my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
     } elsif ($date eq 'con_lost') {      if ($thistype =~ /^(con_lost|no_such_host)/ ||
       $date = "an indeterminate date"; $passed = 0;   $date     =~ /^(con_lost|no_such_host)/) {
     } else {   $status='UNAVAILABLE';
       if (time < $date) { $passed = 0; } else { $passed = 1; }   $date=&mt("may open later.");
       $date = localtime $date;   return($status,$date);
       }
       if ($thistype eq 'date_interval') {
    if ($temp eq 'opendate') {
       $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
    }
    if ($temp eq 'answerdate') {
       $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
    }
       }
       &Apache::lonxml::debug("found :$date: for :$temp:");
       if ($date eq '') {
    $date = &mt("an unknown date"); $passed = 0;
       } elsif ($date eq 'con_lost') {
    $date = &mt("an indeterminate date"); $passed = 0;
       } else {
    if (time < $date) { $passed = 0; } else { $passed = 1; }
    $date = localtime $date;
       }
       if (!$passed) { $type=$temp; last; }
    }
    &Apache::lonxml::debug("have :$type:$passed:");
    if ($passed) {
       $status='SHOW_ANSWER';
       $datemsg=$date;
    } elsif ($type eq 'opendate') {
       $status='CLOSED';
       $datemsg = &mt("will open on")." $date";
    } elsif ($type eq 'duedate') {
       $status='CAN_ANSWER';
       $datemsg = &mt("is due at")." $date";
    } elsif ($type eq 'answerdate') {
       $status='CLOSED';
       $datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
    }
       }
       if ($status eq 'CAN_ANSWER') {
    #check #tries, and if correct.
    my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
    if ( $tries eq '' ) { $tries = '0'; }
    if ( $maxtries eq '' ) { $maxtries = '2'; } 
    if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
    # if (correct and show prob status) or excused then CANNOT_ANSWER
    if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
       &&
       lc($Apache::lonhomework::problemstatus) ne 'no')
      ||
      $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
       $status = 'CANNOT_ANSWER';
    }
       }
   
     #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
     #    (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
     #    return ('UNCHECKEDOUT','needs to be checked out');
     #}
   
   
       &Apache::lonxml::debug("sending back :$status:$datemsg:");
       if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
    &Apache::lonxml::debug("should be allowed to browse a resource when closed");
    $status='CAN_ANSWER';
    $datemsg=&mt('is closed but you are allowed to view it');
     }      }
     if (!$passed) { $type=$temp; last; }  
   }      return ($status,$datemsg);
   &Apache::lonxml::debug("have :$type:$passed:");  
   if ($passed) {  
     $status='SHOW_ANSWER';  
     $datemsg=$date;  
   } elsif ($type eq 'opendate') {  
     $status='CLOSED';  
     $datemsg = "will open on $date";  
   } elsif ($type eq 'duedate') {  
     $status='CAN_ANSWER';  
     $datemsg = "is due at $date";  
   } elsif ($type eq 'answerdate') {  
     $status='CLOSED';  
     $datemsg = "was due on $lastdate, and answers will be available on $date";  
   }  
   if ($status eq 'CAN_ANSWER') {  
     #check #tries  
     my $tries = $Apache::lonhomework::history{"resource.$id.tries"};  
     my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");  
     if ( $tries eq '' ) { $tries = '0'; }  
     if ( $maxtries eq '' ) { $maxtries = '2'; }   
     if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }   
   }  
   
   if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&  
       (!$Apache::lonhomework::history{"resource.0.outtoken"})) {  
       return ('UNCHECKEDOUT','needs to be checked out');  
   }  
   
   
   &Apache::lonxml::debug("sending back :$status:$datemsg:");  
   if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {  
     &Apache::lonxml::debug("should be allowed to browse a resource when closed");  
     $status='CAN_ANSWER';  
     $datemsg='is closed but you are allowed to view it';  
   }  
   if ($ENV{'request.state'} eq "construct") {  
     &Apache::lonxml::debug("in construction ignoring dates");  
     $status='CAN_ANSWER';  
     $datemsg='is in under construction';  
   }  
   return ($status,$datemsg);  
 }  }
   
 sub showhash {  sub showhash {
   my (%hash) = @_;      my (%hash) = @_;
   &showhashsubset(\%hash,'.');      &showhashsubset(\%hash,'.');
   return '';      return '';
   }
   
   sub showarray {
       my ($array)=@_;
       my $string="(";
       foreach my $elm (@{ $array }) {
    if (ref($elm)) {
       if ($elm =~ /ARRAY/ ) {
    $string.=&showarray($elm);
       }
    } else {
       $string.="$elm,"
    }
       }
       chop($string);
       $string.=")";
       return $string;
 }  }
   
 sub showhashsubset {  sub showhashsubset {
   my ($hash,$keyre) = @_;      my ($hash,$keyre) = @_;
   my $resultkey;      my $resultkey;
   foreach $resultkey (sort keys %$hash) {      foreach $resultkey (sort keys %$hash) {
     if ($resultkey =~ /$keyre/) {   if ($resultkey =~ /$keyre/) {
       if (ref($$hash{$resultkey})) {      if (ref($$hash{$resultkey})) {
  if ($$hash{$resultkey} =~ /ARRAY/ ) {   if ($$hash{$resultkey} =~ /ARRAY/ ) {
   my $string="$resultkey ---- (";      &Apache::lonxml::debug("$resultkey ---- ".
   foreach my $elm (@{ $$hash{$resultkey} }) {     &showarray($$hash{$resultkey}));
     $string.="$elm,";   } elsif ($$hash{$resultkey} =~ /HASH/ ) {
   }      &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
   chop($string);      &showhashsubset($$hash{$resultkey},'.');
   &Apache::lonxml::debug("$string)");   } else {
  } else {      &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
   &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");   }
  }      } else {
       } else {   &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
  &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");      }
       }   }
     }      }
   }      &Apache::lonxml::debug("\n<br />restored values^</br>\n");
   &Apache::lonxml::debug("\n<br />restored values^</br>\n");      return '';
   return '';  
 }  }
   
 sub setuppermissions {  sub setuppermissions {
   $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});      $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
   $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});      my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
   return ''      if (! $viewgrades && 
    exists($ENV{'request.course.sec'}) && 
    $ENV{'request.course.sec'} !~ /^\s*$/) {
    $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
                                                  '/'.$ENV{'request.course.sec'});
       }
       $Apache::lonhomework::viewgrades = $viewgrades;
       return ''
 }  }
   
 sub setupheader {  sub setupheader {
   my $request=$_[0];      my $request=$_[0];
   if ($ENV{'browser.mathml'}) {      if ($ENV{'browser.mathml'}) {
     $request->content_type('text/xml');   &Apache::loncommon::content_type($request,'text/xml');
   } else {      } else {
     $request->content_type('text/html');   &Apache::loncommon::content_type($request,'text/html');
   }      }
   if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {      if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
     &Apache::loncommon::no_cache($request);   &Apache::loncommon::no_cache($request);
   }      }
   $request->send_http_header;      $request->send_http_header;
   return OK if $request->header_only;      return OK if $request->header_only;
   return ''      return ''
 }  }
   
 sub handle_save_or_undo {  sub handle_save_or_undo {
   my ($request,$problem,$result) = @_;      my ($request,$problem,$result) = @_;
   my $file    = &Apache::lonnet::filelocation("",$request->uri);      my $file    = &Apache::lonnet::filelocation("",$request->uri);
   my $filebak =$file.".bak";      my $filebak =$file.".bak";
   my $filetmp =$file.".tmp";      my $filetmp =$file.".tmp";
   my $error=0;  
   
   if ($ENV{'form.Undo'} eq 'undo') {  
     my $error=0;      my $error=0;
     if (!copy($file,$filetmp)) { $error=1; }  
     if ((!$error) && (!copy($filebak,$file))) { $error=1; }      &Apache::lonnet::correct_line_ends($result);
     if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }  
     if (!$error) {      if ($ENV{'form.Undo'} eq &mt('undo')) {
       $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");   my $error=0;
     } else {   if (!copy($file,$filetmp)) { $error=1; }
       $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");   if ((!$error) && (!copy($filebak,$file))) { $error=1; }
       $error=1;   if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
     }   if (!$error) {
   } else {      $request->print("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
     my $fs=Apache::File->new(">$filebak");   } else {
     if (defined($fs)) {      $request->print("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
       print $fs $$problem;      $error=1;
       $request->print("<b>Making Backup to $filebak</b><br />");   }
     } else {  
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");  
       $error=2;  
     }  
     my $fh=Apache::File->new(">$file");  
     if (defined($fh)) {  
       print $fh $$result;  
       $request->print("<b>Saving Modifications to $file</b><br />");  
     } else {      } else {
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");   my $fs=Apache::File->new(">$filebak");
       $error|=4;   if (defined($fs)) {
       print $fs $$problem;
       $request->print("<b>".&mt("Making Backup to").
       " $filebak</b><br />");
    } else {
       $request->print("<font color=\"red\" size=\"+1\"><b>".&mt("Unable to make backup")." $filebak</b></font>");
       $error=2;
    }
    my $fh=Apache::File->new(">$file");
    if (defined($fh)) {
       print $fh $$result;
       $request->print("<b>".&mt("Saving Modifications to").
       " $file</b><br />");
    } else {
       $request->print("<font color=\"red\" size=\"+1\"><b>".
       &mt("Unable to write to")." $file</b></font>");
       $error|=4;
    }
     }      }
   }      return $error;
   return $error;  
 }  }
   
 sub analyze_header {  sub analyze_header {
     my ($request) = @_;      my ($request) = @_;
     my $result.='<html><body bgcolor="#FFFFFF">      my $result.='<html>
               <head><title>'.&mt("Analyzing a problem").'</title></head>
               <body bgcolor="#FFFFFF">
             <form name="lonhomework" method="POST" action="'.              <form name="lonhomework" method="POST" action="'.
       $ENV{'request.uri'}.'">      $ENV{'request.uri'}.'">
             <input type="submit" name="problemmode" value="EditXML" />              <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
             <input type="submit" name="problemmode" value="Edit" />              <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
             <hr />              <hr />
             <input type="submit" name="submit" value="View" />              <input type="submit" name="submit" value="'.&mt("View").'" />
             <hr />              <hr />
             List of possible answers:              '.&mt('List of possible answers').':
             </form>';              </form>';
     $request->print($result);      $request->print($result);
     $request->rflush();      $request->rflush();
 }  }
   
   sub analyze_footer {
       my ($request) = @_;
       my $result='</body></html>';
       $request->print($result);
       $request->rflush();
   }
   
 sub analyze {  sub analyze {
     my ($request,$file) = @_;      my ($request,$file) = @_;
     &Apache::lonxml::debug("Analyze");      &Apache::lonxml::debug("Analyze");
Line 339  sub analyze { Line 447  sub analyze {
     my %allparts;      my %allparts;
     my $rndseed=$ENV{'form.rndseed'};      my $rndseed=$ENV{'form.rndseed'};
     &analyze_header($request);      &analyze_header($request);
       my %prog_state=
    &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
         &mt('Getting Problem Variants'),
         $ENV{'form.numtoanalyze'});
     for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {      for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
    &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
    &mt('last problem'));
  my $subresult=&Apache::lonnet::ssi($request->uri,   my $subresult=&Apache::lonnet::ssi($request->uri,
    ('grade_target' => 'analyze'),     ('grade_target' => 'analyze'),
    ('rndseed' => $i));     ('rndseed' => $i+$rndseed));
  &Apache::lonxml::debug(":$subresult:");  
  (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);   (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
  my %analyze=&Apache::lonnet::str2hash($subresult);   my %analyze=&Apache::lonnet::str2hash($subresult);
  &Apache::lonhomework::showhash(%analyze);   my @parts;
  my @parts = @{ $analyze{'parts'} };   if (defined(@{ $analyze{'parts'} })) {
       @parts=@{ $analyze{'parts'} };
    }
  foreach my $part (@parts) {   foreach my $part (@parts) {
     if (!exists($allparts{$part})) {$allparts{$part}=1;};      if (!exists($allparts{$part})) {$allparts{$part}=1;};
     if ($analyze{$part.'.type'} eq 'numericalresponse') {      if ($analyze{$part.'.type'} eq 'numericalresponse' ||
    $analyze{$part.'.type'} eq 'stringresponse' ||
    $analyze{$part.'.type'} eq 'formularesponse'   ) {
  push( @{ $overall{$part.'.answer'} },   push( @{ $overall{$part.'.answer'} },
       [@{ $analyze{$part.'.answer'} }]);        [@{ $analyze{$part.'.answer'} }]);
     }      }
  }   }
     }      }
     foreach my $part (keys(%allparts)) {      &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
  $request->print('<table><tr><td>Part '.$part.'</td></tr>');    &mt('Analyzing Results'));
  foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {      foreach my $part (sort(keys(%allparts))) {
     $request->print('<tr><td>'.join('</td><td>',@{ $answer }).   if (defined(@{ $overall{$part.'.answer'} })) {
     '</td></tr>');      my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
       $request->print('<table><tr><td colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part.'</td></tr>');
       my %frequency;
       foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
    $frequency{join("\0",@{ $answer })}++;
       }
       $request->print('<tr><td colspan="'.($num_cols).'">'.&mt('Answer').'</td><td>'.&mt('Frequency').'</td></tr>');
       foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
    $request->print('<tr><td align="right">'.
    join('</td><td align="right">',split("\0",$answer)).
    '</td><td>('.$frequency{$answer}.
    ')</td></tr>');
       }
       $request->print('</table>');
    } else {
       $request->print('<p>'.&mt('Response').' '.$part.' '.
       &mt('is not analyzable at this time').'</p>');
  }   }
     }      }
       if (scalar(keys(%allparts)) == 0 ) {
    $request->print('<p>'.&mt('Found no analyzable respones in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
       }
       &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
       &analyze_footer($request);
     &Apache::lonhomework::showhash(%overall);      &Apache::lonhomework::showhash(%overall);
     return $result;      return $result;
 }  }
   
 sub editxmlmode {  sub editxmlmode {
   my ($request,$file) = @_;      my ($request,$file) = @_;
   my $result;      my $result;
   my $problem=&Apache::lonnet::getfile($file);      my $problem=&Apache::lonnet::getfile($file);
   if ($problem == -1) {      if ($problem eq -1) {
     &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");   &Apache::lonxml::error("<b> ".&mt('Unable to find').
     $problem='';         " <i>$file</i></b>");
   }   $problem='';
   if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {      }
     my $error=&handle_save_or_undo($request,\$problem,      if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
    \$ENV{'form.editxmltext'});   my $error=&handle_save_or_undo($request,\$problem,
     if (!$error) { $problem=&Apache::lonnet::getfile($file); }         \$ENV{'form.editxmltext'});
   }   if (!$error) { $problem=&Apache::lonnet::getfile($file); }
   &Apache::lonhomework::showhashsubset(\%ENV,'^form');      }
   if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {  
     &Apache::lonhomework::showhashsubset(\%ENV,'^form');      &Apache::lonhomework::showhashsubset(\%ENV,'^form');
     $ENV{'form.problemmode'}='View';      if ( $ENV{'form.submit'} eq &mt('Submit Changes and View') ) {
     &renderpage($request,$file);   &Apache::lonhomework::showhashsubset(\%ENV,'^form');
   } else {   $ENV{'form.problemmode'}='View';
     my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);   &renderpage($request,$file);
     my $xml_help = Apache::loncommon::help_open_topic("Problem_Editor_XML_Index");      } else {
     if ($cols > 80) { $cols = 80; }   my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
     if ($cols < 70) { $cols = 70; }   my $xml_help = '<table><tr><td>'.
     if ($rows < 20) { $rows = 20; }      &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
     $result.='<html><body bgcolor="#FFFFFF">      "Problem Editing Help").
       '</td><td>'.
          &Apache::loncommon::help_open_faq(5).
          &Apache::loncommon::help_open_bug('Authoring').'</td></tr></table>';
    if ($cols > 80) { $cols = 80; }
    if ($cols < 70) { $cols = 70; }
    if ($rows < 20) { $rows = 20; }
    $result.='<html><body bgcolor="#FFFFFF">
             <form name="lonhomework" method="POST" action="'.              <form name="lonhomework" method="POST" action="'.
       $ENV{'request.uri'}.'">      $ENV{'request.uri'}.'">
             <input type="hidden" name="problemmode" value="EditXML" />              <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
             <input type="submit" name="problemmode" value="Discard Edits and View" />              <input type="submit" name="problemmode" value="'.&mt('Discard Edits and View').'" />
             <input type="submit" name="problemmode" value="Edit" />              <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
             <hr />              <hr />
             <input type="submit" name="submit" value="Submit Changes" />              <input type="submit" name="submit" value="'.&mt('Submit Changes').'" />
             <input type="submit" name="submit" value="Submit Changes and View" />              <input type="submit" name="submit" value="'.&mt('Submit Changes and View').'" />
             <input type="submit" name="Undo" value="undo" />              <input type="submit" name="Undo" value="'.&mt('undo').'" />
             <hr />              <hr />
             ' . $xml_help . ' Problem Help<br>              ' . $xml_help . '
             <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.              <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
       &HTML::Entities::encode($problem).'</textarea>      &HTML::Entities::encode($problem).'</textarea>
             </form></body></html>';              </form></body></html>';
     $request->print($result);   $request->print($result);
   }      }
   return '';      return '';
 }  }
   
 sub renderpage {  sub renderpage {
   my ($request,$file) = @_;      my ($request,$file) = @_;
   
   my (@targets) = &get_target();      my (@targets) = &get_target();
   &Apache::lonxml::debug("Running targets ".join(':',@targets));      &Apache::lonhomework::showhashsubset(\%ENV,'form.');
   foreach my $target (@targets) {      &Apache::lonxml::debug("Running targets ".join(':',@targets));
     #my $t0 = [&gettimeofday()];      foreach my $target (@targets) {
     my $problem=&Apache::lonnet::getfile($file);   #my $t0 = [&gettimeofday()];
     if ($problem == -1) {   my $problem=&Apache::lonnet::getfile($file);
       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");   if ($problem eq -1) {
       $problem='';      &Apache::lonxml::error("<b> ".&mt('Unable to find')." <i>$file</i></b>");
     }      $problem='';
    }
     my %mystyle;  
     my $result = '';   my %mystyle;
     &Apache::inputtags::initialize_inputtags();   my $result = '';
     &Apache::outputtags::initialize_outputtags();   if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
     &Apache::edit::initialize_edit();   if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
     if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }   if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
     if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }  
     if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}   &Apache::lonxml::debug("Should be parsing now");
    $result = &Apache::lonxml::xmlparse($request, $target, $problem,
     &Apache::lonxml::debug("Should be parsing now");      &setup_vars($target),%mystyle);
     $result = &Apache::lonxml::xmlparse($request, $target, $problem,   undef($Apache::lonhomework::parsing_a_problem);
  &setup_vars($target),%mystyle);   #$request->print("Result follows:");
    if ($target eq 'modified') {
     #$request->print("Result follows:");      &handle_save_or_undo($request,\$problem,\$result);
     if ($target eq 'modified') {   } else {
       &handle_save_or_undo($request,\$problem,\$result);      if ($target eq 'analyze') {
     } else {   $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
       if ($target eq 'analyze') {   undef(%Apache::lonhomework::analyze);
  $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);      }
  undef(%Apache::lonhomework::analyze);      #my $td=&tv_interval($t0);
       }      #if ( $Apache::lonxml::debug) {
       #my $td=&tv_interval($t0);      #$result =~ s:</body>::;
       #if ( $Apache::lonxml::debug) {      #$result.="<br />Spent $td seconds processing target $target\n</body>";
  #$result =~ s:</body>::;      #}
  #$result.="<br />Spent $td seconds processing target $target\n</body>";      $request->print($result);
       #}      $request->rflush();
       $request->print($result);   }
    #$request->print(":Result ends");
    #my $td=&tv_interval($t0);
     }      }
     #$request->print(":Result ends");  
     #my $td=&tv_interval($t0);  
   }  
 }  }
   
 # with no arg it returns a HTML <option> list of the template titles  # with no arg it returns a HTML <option> list of the template titles
 # with one arg it returns the filename associated with the arg passed  # with one arg it returns the filename associated with the arg passed
 sub get_template_list {  sub get_template_list {
   my ($namewanted,$extension) = @_;      my ($namewanted,$extension) = @_;
   my $result;      my $result;
   my @allnames;      my @allnames;
   &Apache::lonxml::debug("Looking for :$extension:");      &Apache::lonxml::debug("Looking for :$extension:");
   foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {      foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
     my $name=&Apache::lonnet::metadata($file,'title');   my $name=&Apache::lonnet::metadata($file,'title');
     if ($namewanted && ($name eq $namewanted)) {   if ($namewanted && ($name eq $namewanted)) {
       $result=$file;      $result=$file;
       last;      last;
     } else {   } else {
  if ($name) { push (@allnames, $name); }      if ($name) { push (@allnames, $name); }
    }
       }
       if (@allnames && !$result) {
    $result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
       join('</option><option>',sort(@allnames)).'</option>';
     }      }
   }      return $result;
   if (@allnames && !$result) {  
     $result="<option>Select a $extension type</option>\n<option>".  
       join('</option><option>',sort(@allnames)).'</option>';  
   }  
   return $result;  
 }  }
   
 sub newproblem {  sub newproblem {
Line 485  sub newproblem { Line 628  sub newproblem {
     my $extension=$request->uri;      my $extension=$request->uri;
     $extension=~s:^.*\.([\w]+)$:$1:;      $extension=~s:^.*\.([\w]+)$:$1:;
     &Apache::lonxml::debug("Looking for :$extension:");      &Apache::lonxml::debug("Looking for :$extension:");
       my $templatelist=&get_template_list('',$extension);
     if ($ENV{'form.template'} &&      if ($ENV{'form.template'} &&
  $ENV{'form.template'} ne "Select a $extension type") {   $ENV{'form.template'} ne "Select a $extension template") {
  use File::Copy;   use File::Copy;
  my $file = &get_template_list($ENV{'form.template'},$extension);   my $file = &get_template_list($ENV{'form.template'},$extension);
  my $dest = &Apache::lonnet::filelocation("",$request->uri);   my $dest = &Apache::lonnet::filelocation("",$request->uri);
  copy($file,$dest);   copy($file,$dest);
  &renderpage($request,$dest);   &renderpage($request,$dest);
     } elsif($ENV{'form.newfile'}) {      } elsif($ENV{'form.newfile'} && !$templatelist) {
  # I don't like hard-coded filenames but for now, this will work.   # I don't like hard-coded filenames but for now, this will work.
  use File::Copy;   use File::Copy;
  my $templatefilename =    my $templatefilename =
     $request->dir_config('lonIncludes').'/templates/blank.problem';      $request->dir_config('lonIncludes').'/templates/blank.problem';
  &Apache::lonxml::debug("$templatefilename");   &Apache::lonxml::debug("$templatefilename");
  my $dest = &Apache::lonnet::filelocation("",$request->uri);   my $dest = &Apache::lonnet::filelocation("",$request->uri);
  copy($templatefilename,$dest);   copy($templatefilename,$dest);
  &renderpage($request,$dest);   &renderpage($request,$dest);
     } else {      } else {
  my $templatelist=&get_template_list('',$extension);  
  my $url=$request->uri;   my $url=$request->uri;
    my $shownurl=$url;
    $shownurl=~s-^/~-/priv/-;
  my $dest = &Apache::lonnet::filelocation("",$request->uri);   my $dest = &Apache::lonnet::filelocation("",$request->uri);
    my $errormsg;
    if ($ENV{'form.newfile'}) {
       $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
    }
  my $instructions;   my $instructions;
  if ($templatelist) { $instructions=", select a template from the pull-down menu below. Then";}   my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
    if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
    my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
     'resource' => 'resource',
     'requested' => 'The requested file',
     'not exist' => 'currently does not exist',
     'createnew' => 'To create a new',
     'click' => 'click on the',
     'Create' => 'Create',
     'button' => 'button');
  $request->print(<<ENDNEWPROBLEM);   $request->print(<<ENDNEWPROBLEM);
 <body bgcolor="#FFFFFF">  $bodytag
 The requested file $url doesn\'t exist. <br />  <h1>$lt{'create'} $extension $lt{'resource'}</h1>
 To create a new $extension$instructions click on the Create $extension button.  $errormsg
 <form action="$url" method="POST">  $lt{'requested'} <tt>$shownurl</tt> $lt{'not exist'}.
   <p>
   <b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
   </p>
   <p><form action="$url" method="POST">
 ENDNEWPROBLEM  ENDNEWPROBLEM
  if (defined($templatelist)) {   if (defined($templatelist)) {
     $request->print("<select name=\"template\">$templatelist</select>");      $request->print("<select name=\"template\">$templatelist</select>");
  }   }
  $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");   $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
  $request->print("</form></body>");   $request->print("</form></p></body>");
     }      }
     return '';      return '';
 }  }
   
 sub view_or_edit_menu {  sub view_or_edit_menu {
   my ($request) = @_;      my ($request) = @_;
   my $url=$request->uri;      my $url=$request->uri;
   $request->print(<<EDITMENU);      my %lt=&Apache::lonlocal::texthash( 'would' => 'Would you like to',
         'view' => 'View',
         'Edit' => 'edit',
         'or' => 'or',
         'the problem' => 'the problem');
       $request->print(<<EDITMENU);
 <body bgcolor="#FFFFFF">  <body bgcolor="#FFFFFF">
 <form action="$url" method="POST">  <form action="$url" method="POST">
 Would you like to <input type="submit" name="problemmode" value="View"> or  $lt{'would'} <input type="submit" name="problemmode" value="&lt{'view'}">
 <input type="submit" name="problemmode" value="Edit"> the problem.  &lt{'or'} <input type="submit" name="problemmode" value="&lt{'Edit'}">
   &lt{'the problem'}.
 </form>  </form>
 </body>  </body>
 EDITMENU  EDITMENU
 }  }
   
 sub handler {  sub handler {
   #my $t0 = [&gettimeofday()];      #my $t0 = [&gettimeofday()];
   my $request=$_[0];      my $request=$_[0];
       
 #  if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}      $Apache::lonxml::debug=$ENV{'user.debug'};
   $Apache::lonxml::debug=$ENV{'user.debug'};      if (&setupheader($request)) { return OK; }
       $ENV{'request.uri'}=$request->uri;
   if (&setupheader($request)) { return OK; }  
   $ENV{'request.uri'}=$request->uri;      #setup permissions
       $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
       $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
       &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
       # some times multiple problemmodes are submitted, need to select
       # the last one
       &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
       if ( defined($ENV{'form.problemmode'}) &&
    ref($ENV{'form.problemmode'}) ) {
    &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
    my $mode=$ENV{'form.problemmode'}->[-1];
    undef $ENV{'form.problemmode'};
    $ENV{'form.problemmode'}=$mode;
       }
       &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
       my $file=&Apache::lonnet::filelocation("",$request->uri);
   
       #check if we know where we are
       if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
    # if we are browsing we might not be able to know where we are
    if ($Apache::lonhomework::browse ne 'F') {
       #should know where we are, so ask
       if ( &Apache::lonnet::mod_perl_version() == 2 ) {
    &Apache::lonnet::cleanenv();
       }
       $request->internal_redirect('/adm/ambiguous'); return;
    }
       }
   
   #setup permissions      my ($symb) = &Apache::lonxml::whichuser();
   $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});      &Apache::lonxml::debug('symb is '.$symb);
   $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});      if ($ENV{'request.state'} eq "construct" || $symb eq '') {
   &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");   if ($ENV{'form.resetdata'} eq &mt('Reset Submissions') ||
   # some times multiple problemmodes are submitted, need to select      $ENV{'form.resetdata'} eq &mt('New Problem Variation') ||
   # the last one      $ENV{'form.newrandomization'} eq &mt('New Randomization')) {
   &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});      my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
   if ( defined($ENV{'form.problemmode'}) &&      &Apache::lonnet::tmpreset($symb,'',$domain,$name);
        ref($ENV{'form.problemmode'}) ) {      &Apache::lonxml::debug("Attempt reset");
     &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));   }
     my $mode=$ENV{'form.problemmode'}->[-1];      }
     undef $ENV{'form.problemmode'};      if ($ENV{'request.state'} eq "construct") {
     $ENV{'form.problemmode'}=$mode;   if ( -e $file ) {
   }      &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
   &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});      ['problemmode']);
   my $file=&Apache::lonnet::filelocation("",$request->uri);      if (!(defined $ENV{'form.problemmode'})) {
    #first visit to problem in construction space
   #check if we know where we are   #&view_or_edit_menu($request);
   if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {    $ENV{'form.problemmode'}='View';
     # if we are browsing we might not be able to know where we are   &renderpage($request,$file);
     if ($Apache::lonhomework::browse ne 'F') {      } elsif ($ENV{'form.problemmode'} eq &mt('EditXML')) {
       #should know where we are, so ask   &editxmlmode($request,$file);
       $request->internal_redirect('/adm/ambiguous'); return;      } elsif ($ENV{'form.problemmode'} eq &mt('Calculate answers')) {
     }   &analyze($request,$file);
   }      } else {
    &renderpage($request,$file);
   if ($ENV{'request.state'} eq "construct") {      }
     if ($ENV{'form.resetdata'} eq 'Reset Submissions') {   } else {
       my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();      # requested file doesn't exist in contruction space
       &Apache::lonnet::tmpreset($symb,'',$domain,$name);      &newproblem($request);
     }   }
     if ( -e $file ) {  
       if (!(defined $ENV{'form.problemmode'})) {  
  #first visit to problem in construction space  
  #&view_or_edit_menu($request);  
  $ENV{'form.problemmode'}='View';  
  &renderpage($request,$file);  
       } elsif ($ENV{'form.problemmode'} eq 'EditXML') {  
  &editxmlmode($request,$file);  
       } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {  
  &analyze($request,$file);  
       } else {  
  &renderpage($request,$file);  
       }  
     } else {      } else {
       # requested file doesn't exist in contruction space   # just render the page normally outside of construction space
       &newproblem($request);   &Apache::lonxml::debug("not construct");
    &renderpage($request,$file);
     }      }
   } else {      #my $td=&tv_interval($t0);
     # just render the page normally outside of construction space      #&Apache::lonxml::debug("Spent $td seconds processing");
     &Apache::lonxml::debug("not construct");      # &Apache::lonhomework::send_footer($request);
     &renderpage($request,$file);      # always turn off debug messages
   }      $Apache::lonxml::debug=0;
   #my $td=&tv_interval($t0);      return OK;
   #&Apache::lonxml::debug("Spent $td seconds processing");  
   # &Apache::lonhomework::send_footer($request);  
   # always turn off debug messages  
   $Apache::lonxml::debug=0;  
   return OK;  
   
 }  }
   
Removed from v.1.104  
changed lines
  Added in v.1.163

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500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.