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version 1.60, 2001/09/14 20:14:12 version 1.176, 2004/05/26 22:45:57
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   # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler  # The LON-CAPA Homework handler
 # Guy Albertelli  #
 # 11/30 Gerd Kortemeyer  # $Id$
 # 6/1,8/17,8/18 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::lonhomework;  package Apache::lonhomework;
 use strict;  use strict;
 use Apache::style;  use Apache::style();
 use Apache::lonxml;  use Apache::lonxml();
 use Apache::lonnet;  use Apache::lonnet();
 use Apache::inputtags;  use Apache::lonplot();
 use Apache::structuretags;  use Apache::inputtags();
 use Apache::randomlabel;  use Apache::structuretags();
 use Apache::response;  use Apache::randomlabel();
 use Apache::hint;  use Apache::response();
 use Apache::outputtags;  use Apache::hint();
   use Apache::outputtags();
   use Apache::caparesponse();
   use Apache::radiobuttonresponse();
   use Apache::optionresponse();
   use Apache::imageresponse();
   use Apache::essayresponse();
   use Apache::externalresponse();
   use Apache::rankresponse();
   use Apache::matchresponse();
   use Apache::chemresponse();
   use Apache::drawimage();
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common);
   use HTML::Entities();
   use Apache::loncommon();
   use Apache::lonlocal;
 #use Time::HiRes qw( gettimeofday tv_interval );  #use Time::HiRes qw( gettimeofday tv_interval );
   
 sub 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 $ENV{'form.submitted'}) {   ($ENV{'request.state'} eq "uploaded")) {
       return ('grade', 'web');   if ( defined($ENV{'form.grade_target'}  ) 
     } else {       && ($ENV{'form.grade_target'} eq 'tex')) {
       return ('web');      return ($ENV{'form.grade_target'});
     }   } elsif ( defined($ENV{'form.grade_target'}  ) 
   } elsif ($ENV{'request.state'} eq "construct") {    && ($Apache::lonhomework::viewgrades eq 'F' )) {
     if ( defined $ENV{'form.preview'}) {      return ($ENV{'form.grade_target'});
       if ( defined $ENV{'form.submitted'}) {   }
  return ('grade', 'web');  
       } else {   if ( defined($ENV{'form.submitted'}) &&
  return ('web');       ( !defined($ENV{'form.resetdata'})) &&
       }       ( !defined($ENV{'form.newrandomization'}))) {
     } else {      return ('grade', 'web');
       if ( $ENV{'form.problemmode'} eq 'View' ) {  
  if ( defined $ENV{'form.submitted'}) {  
   return ('grade', 'web','answer');  
  } else {   } else {
   return ('web','answer');      return ('web');
  }   }
       } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {      } elsif ($ENV{'request.state'} eq "construct") {
  if ( $ENV{'form.submitted'} eq 'edit' ) {   if ( defined($ENV{'form.grade_target'}) ) {
   return ('modified','edit');      return ($ENV{'form.grade_target'});
    }
    if ( defined($ENV{'form.preview'})) {
       if ( defined($ENV{'form.submitted'})) {
    return ('grade', 'web');
       } else {
    return ('web');
       }
  } else {   } else {
   return ('edit');      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');
       }
  }   }
       } 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 $allowed;
   }
   # JB, 9/24/2002: Any changes in this function may require a change
   # in lonnavmaps::resource::getDateStatus.
 sub check_access {  sub check_access {
   my ($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:");  
   foreach $temp ("opendate","duedate","answerdate") {      if ($ENV{'request.state'} eq "construct") {
     $lastdate = $date;   if ($ENV{'form.problemstate'}) {
     $date = &Apache::lonnet::EXT("resource.$id.$temp");      if ($ENV{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
     &Apache::lonxml::debug("found :$date: for :$temp:");   if ( ! ($ENV{'form.problemstate'} eq 'CANNOT_ANSWER_correct' &&
     if ($date eq '') {   lc($Apache::lonhomework::problemstatus) eq 'no')) {
       $date = "an unknown date"; $passed = 0;      return ('CANNOT_ANSWER',
     } elsif ($date eq 'con_lost') {      &mt('is in this state due to author settings.'));
       $date = "an indeterminate date"; $passed = 0;   }
     } else {      } else {
       if (time < $date) { $passed = 0; } else { $passed = 1; }   return ($ENV{'form.problemstate'},
       $date = localtime $date;   &mt('is in this state due to author settings.'));
       }
    }
    &Apache::lonxml::debug("in construction ignoring dates");
    $status='CAN_ANSWER';
    $datemsg=&mt('is in under construction');
   # return ($status,$datemsg);
       }
   
       &Apache::lonxml::debug("checking for part :$id:");
       &Apache::lonxml::debug("time:".time);
   
       if ($ENV{'request.state'} ne "construct") {
    my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
    if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
       $status='INVALID_ACCESS';
       $date=&mt("can not be accessed from your location.");
       return($status,$date);
    }
   
    foreach $temp ("opendate","duedate","answerdate") {
       $lastdate = $date;
       $date = &Apache::lonnet::EXT("resource.$id.$temp");
       my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
       if ($thistype =~ /^(con_lost|no_such_host)/ ||
    $date     =~ /^(con_lost|no_such_host)/) {
    $status='UNAVAILABLE';
    $date=&mt("may open later.");
    return($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 '' && 
        $ENV{'request.state'} ne 'construct') { $maxtries = '2'; } 
    if ($maxtries && $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) = @_;
   my $resultkey;      &showhashsubset(\%hash,'.');
   foreach $resultkey (sort keys %hash) {      return '';
     &Apache::lonxml::debug("$resultkey ---- $hash{$resultkey}");  }
   }  
   &Apache::lonxml::debug("\n<br />restored values^</br>\n");  sub showarray {
   return '';      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 {
       my ($hash,$keyre) = @_;
       my $resultkey;
       foreach $resultkey (sort keys %$hash) {
    if ($resultkey =~ /$keyre/) {
       if (ref($$hash{$resultkey})) {
    if ($$hash{$resultkey} =~ /ARRAY/ ) {
       &Apache::lonxml::debug("$resultkey ---- ".
      &showarray($$hash{$resultkey}));
    } elsif ($$hash{$resultkey} =~ /HASH/ ) {
       &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
       &showhashsubset($$hash{$resultkey},'.');
    } else {
       &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
    }
       } else {
    &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
       }
    }
       }
       &Apache::lonxml::debug("\n<br />restored values^</br>\n");
       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');
   }      }
   $request->send_http_header;      if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
   return OK if $request->header_only;   &Apache::loncommon::no_cache($request);
   return ''      }
       $request->send_http_header;
       return OK if $request->header_only;
       return ''
 }  }
   
 sub handle_save_or_undo {  sub handle_save_or_undo {
   my ($request,$problem,$result) = @_;      my ($request,$problem,$result) = @_;
   my $fileout = &Apache::lonnet::filelocation("",$request->uri);      my $file    = &Apache::lonnet::filelocation("",$request->uri);
   my $filesave=$fileout.".bak";      my $filebak =$file.".bak";
       my $filetmp =$file.".tmp";
   if ($ENV{'form.Undo'} eq 'undo') {      my $error=0;
     if (copy($filesave,$fileout)) {  
       $request->print("<b>Undid changes, Copied $filesave to $fileout<br /></b>");      &Apache::lonnet::correct_line_ends($result);
   
       if ($ENV{'form.Undo'} eq &mt('undo')) {
    my $error=0;
    if (!copy($file,$filetmp)) { $error=1; }
    if ((!$error) && (!copy($filebak,$file))) { $error=1; }
    if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
    if (!$error) {
       &Apache::lonxml::info("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
    } else {
       &Apache::lonxml::info("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
       $error=1;
    }
     } else {      } else {
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to undo, unable to copy $filesave to $fileout<br /></b></font>");   my $fs=Apache::File->new(">$filebak");
    if (defined($fs)) {
       print $fs $$problem;
       &Apache::lonxml::info("<b>".&mt("Making Backup to").
     " $filebak</b>");
    } else {
       &Apache::lonxml::info("<font color=\"red\" size=\"+1\"><b>".&mt("Unable to make backup")." $filebak</b></font>");
       $error=2;
    }
    my $fh=Apache::File->new(">$file");
    if (defined($fh)) {
       print $fh $$result;
       &Apache::lonxml::info("<b>".&mt("Saving Modifications to").
     " $file</b>");
    } else {
       &Apache::lonxml::info("<font color=\"red\" size=\"+1\"><b>".
     &mt("Unable to write to")." $file</b></font>");
       $error|=4;
    }
     }      }
   } else {      return $error;
     my $fs=Apache::File->new(">$filesave");  }
     if (defined($fs)) {  
       print $fs $$problem;  sub analyze_header {
       $request->print("<b>Making Backup to $filesave</b><br />");      my ($request) = @_;
     } else {      my $result.='<html>
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filesave</b></font>");              <head><title>'.&mt("Analyzing a problem").'</title></head>
               <body bgcolor="#FFFFFF">'.&Apache::lonxml::message_location().'
               <form name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($ENV{'request.uri'},'<>&"').'">
               <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
               <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
               <hr />
               <input type="submit" name="submit" value="'.&mt("View").'" />
               <hr />
               </form>';
       &Apache::lonxml::add_messages(\$result);
       $request->print($result);
       $request->rflush();
   }
   
   sub analyze_footer {
       my ($request) = @_;
       my $result='</body></html>';
       $request->print($result);
       $request->rflush();
   }
   
   sub analyze {
       my ($request,$file) = @_;
       &Apache::lonxml::debug("Analyze");
       my $result;
       my %overall;
       my %allparts;
       my $rndseed=$ENV{'form.rndseed'};
       &analyze_header($request);
       my %prog_state=
    &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
         &mt('Getting Problem Variants'),
         $ENV{'form.numtoanalyze'},
         'inline',undef);
       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,
      ('grade_target' => 'analyze'),
      ('rndseed' => $i+$rndseed));
    (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
    my %analyze=&Apache::lonnet::str2hash($subresult);
    my @parts;
    if (defined(@{ $analyze{'parts'} })) {
       @parts=@{ $analyze{'parts'} };
    }
    foreach my $part (@parts) {
       if (!exists($allparts{$part})) {$allparts{$part}=1;};
       if ($analyze{$part.'.type'} eq 'numericalresponse' ||
    $analyze{$part.'.type'} eq 'stringresponse' ||
    $analyze{$part.'.type'} eq 'formularesponse'   ) {
    push( @{ $overall{$part.'.answer'} },
         [@{ $analyze{$part.'.answer'} }]);
       }
    }
       }
       &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
     &mt('Analyzing Results'));
       $request->print('<hr />'.&mt('List of possible answers').': ');
       foreach my $part (sort(keys(%allparts))) {
    if (defined(@{ $overall{$part.'.answer'} })) {
       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>');
     }      }
     my $fh=Apache::File->new(">$fileout");      &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
     if (defined($fh)) {      &analyze_footer($request);
       print $fh $$result;      &Apache::lonhomework::showhash(%overall);
       $request->print("<b>Saving Modifications to $fileout</b><br />");      return $result;
   }
   
   sub editxmlmode {
       my ($request,$file) = @_;
       my $result;
       my $problem=&Apache::lonnet::getfile($file);
       if ($problem eq -1) {
    &Apache::lonxml::error("<b> ".&mt('Unable to find').
          " <i>$file</i></b>");
    $problem='';
       }
       if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
    my $error=&handle_save_or_undo($request,\$problem,
          \$ENV{'form.editxmltext'});
    if (!$error) { $problem=&Apache::lonnet::getfile($file); }
       }
       &Apache::lonhomework::showhashsubset(\%ENV,'^form');
       if ( $ENV{'form.submit'} eq &mt('Submit Changes and View') ) {
    &Apache::lonhomework::showhashsubset(\%ENV,'^form');
    $ENV{'form.problemmode'}='View';
    &renderpage($request,$file);
     } else {      } else {
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $fileout</b></font>");   my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
    my $xml_help = '<table><tr><td>'.
       &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
       "Problem Editing Help").
       '</td><td>'.
          &Apache::loncommon::help_open_faq(5).
          &Apache::loncommon::help_open_bug('Authoring').'</td></tr></table>';
    if ($cols > 80) { $cols = 80; }
    if ($cols < 70) { $cols = 70; }
    if ($rows < 20) { $rows = 20; }
    $result.='<html><body bgcolor="#FFFFFF">'.
       &Apache::lonxml::message_location().'
               <form name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($ENV{'request.uri'},'<>&"').'">
               <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
               <input type="submit" name="problemmode" accesskey="d" value="'.&mt('Discard Edits and View').'" />
               <input type="submit" name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
               <hr />
               <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
               <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
               <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
               <hr />
               ' . $xml_help . '
               <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
       &HTML::Entities::encode($problem,'<>&"').'</textarea>
               </form></body></html>';
    &Apache::lonxml::add_messages(\$result);
    $request->print($result);
     }      }
   }      return '';
 }  }
   
 sub renderpage {  sub renderpage {
   my ($request,$file) = @_;      my ($request,$file) = @_;
   
   my (@targets) = &get_target();      my (@targets) = &get_target();
   foreach my $target (@targets) {      &Apache::lonhomework::showhashsubset(\%ENV,'form.');
     #my $t0 = [&gettimeofday()];      &Apache::lonxml::debug("Running targets ".join(':',@targets));
     my $problem=&Apache::lonnet::getfile($file);      my $overall_result;
     if ($problem == -1) {      foreach my $target (@targets) {
       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");   #my $t0 = [&gettimeofday()];
       $problem='';   my $problem=&Apache::lonnet::getfile($file);
     }   if ($problem eq -1) {
       &Apache::lonxml::error("<b> ".&mt('Unable to find')." <i>$file</i></b>");
       $problem='';
    }
   
     my %mystyle;   my %mystyle;
     my $result = '';   my $result = '';
     &Apache::inputtags::initialize_inputtags;   if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
     &Apache::edit::initialize_edit;   if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
     if ($target eq 'web') {   if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
       if (&Apache::lonnet::symbread() eq '') {  
  if ($ENV{'request.state'} eq "construct") {   &Apache::lonxml::debug("Should be parsing now");
    $result = &Apache::lonxml::xmlparse($request, $target, $problem,
       &setup_vars($target),%mystyle);
    undef($Apache::lonhomework::parsing_a_problem);
    #$request->print("Result follows:");
    if ($target eq 'modified') {
       &handle_save_or_undo($request,\$problem,\$result);
  } else {   } else {
   $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");      if ($target eq 'analyze') {
    $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
    undef(%Apache::lonhomework::analyze);
       }
       #my $td=&tv_interval($t0);
       #if ( $Apache::lonxml::debug) {
       #$result =~ s:</body>::;
       #$result.="<br />Spent $td seconds processing target $target\n</body>";
       #}
   #    $request->print($result);
       $overall_result.=$result;
   #    $request->rflush();
  }   }
       }   #$request->print(":Result ends");
       #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }   #my $td=&tv_interval($t0);
     }  
     if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }  
   
     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');  
     if ($default == -1) {  
       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");  
       $default='';  
     }      }
     $result = &Apache::lonxml::xmlparse($target, $problem,      &Apache::lonxml::add_messages(\$overall_result);
  $default.&setup_vars($target),%mystyle);      $request->print($overall_result);   
       $request->rflush();   
     #$request->print("Result follows:");  
     if ($target eq 'modified') {  
       &handle_save_or_undo($request,\$problem,\$result);  
     } else {  
       #my $td=&tv_interval($t0);  
       #if ( $Apache::lonxml::debug) {  
  #$result =~ s:</body>::;  
  #$result.="<br />Spent $td seconds processing target $target\n</body>";  
       #}  
       $request->print($result);  
     }  
     #$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 $result;
   &Apache::lonxml::debug("Looking for :$extension:");      my @allnames;
   foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {      &Apache::lonxml::debug("Looking for :$extension:");
     my $name=&Apache::lonnet::metadata($file,'title');      foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
     if ($namewanted && ($name eq $namewanted)) {   my $name=&Apache::lonnet::metadata($file,'title');
       $result=$file;   if ($namewanted && ($name eq $namewanted)) {
       last;      $result=$file;
     } else {      last;
       $result.="<option>$name</option>";   } else {
       if ($name) { push (@allnames, $name); }
    }
     }      }
   }      if (@allnames && !$result) {
   return $result;   $result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
       join('</option><option>',sort(@allnames)).'</option>';
       }
       return $result;
 }  }
   
 sub newproblem {  sub newproblem {
   my ($request) = @_;      my ($request) = @_;
       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 :$extension:");  
   if ($ENV{'form.template'}) {  
     use File::Copy;  
     my $file = &get_template_list($ENV{'form.template'},$extension);  
     my $dest = &Apache::lonnet::filelocation("",$request->uri);  
     copy($file,$dest);  
     &renderpage($request,$file);  
   } else {  
     my $templatelist=&get_template_list('',$extension);      my $templatelist=&get_template_list('',$extension);
     my $url=$request->uri;      if ($ENV{'form.template'} &&
     my $dest = &Apache::lonnet::filelocation("",$request->uri);   $ENV{'form.template'} ne "Select a $extension template") {
     $request->print(<<ENDNEWPROBLEM);   use File::Copy;
 <body bgcolor="#FFFFFF">   my $file = &get_template_list($ENV{'form.template'},$extension);
 The request file $url doesn\'t exist. You can create a new $extension <br />   my $dest = &Apache::lonnet::filelocation("",$request->uri);
 <form action="$url" method="POST">   copy($file,$dest);
 <input type="submit" value="New $extension"><br />   &renderpage($request,$dest);
 <select name="template">      } elsif($ENV{'form.newfile'} && !$templatelist) {
 $templatelist   # I don't like hard-coded filenames but for now, this will work.
 </select>   use File::Copy;
 </form>   my $templatefilename =
 </body>      $request->dir_config('lonIncludes').'/templates/blank.problem';
    &Apache::lonxml::debug("$templatefilename");
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    copy($templatefilename,$dest);
    &renderpage($request,$dest);
       } else {
    my $url=&HTML::Entities::encode($request->uri,'<>&"');
    my $shownurl=$url;
    $shownurl=~s-^/~-/priv/-;
    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 $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
    if ($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);
   $bodytag
   <h1>$lt{'create'} $extension $lt{'resource'}</h1>
   $errormsg
   $lt{'requested'} <tt>$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)) {
       $request->print("<select name=\"template\">$templatelist</select>");
   return '';   }
    $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
    $request->print("</form></p></body>");
       }
       return '';
 }  }
   
 sub view_or_edit_menu {  sub view_or_edit_menu {
   my ($request) = @_;      my ($request) = @_;
   my $url=$request->uri;      my $url=&HTML::Entities::encode($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" accesskey="v" value="&lt{'view'}">
 <input type="submit" name="problemmode" value="Edit"> the problem.  &lt{'or'} <input type="submit" name="problemmode" accesskey="e" 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'};
       if (&setupheader($request)) { return OK; }
   if (&setupheader($request)) { return OK; }      $ENV{'request.uri'}=$request->uri;
   $ENV{'request.uri'}=$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' && 
       $ENV{'request.state'} ne "construct") {
       #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') ||
       $ENV{'form.resetdata'} eq &mt('New Problem Variation') ||
   my $file=&Apache::lonnet::filelocation("",$request->uri);      $ENV{'form.newrandomization'} eq &mt('New Randomization')) {
       my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
   #check if we know where we are      &Apache::lonnet::tmpreset($symb,'',$domain,$name);
   if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {       &Apache::lonxml::debug("Attempt reset");
     # if we are browsing we might not be able to know where we are   }
     if ($Apache::lonhomework::browse ne 'F') {      }
       #should know where we are, so ask      if ($ENV{'request.state'} eq "construct") {
       $request->internal_redirect('/adm/ambiguous'); return;   if ( -e $file ) {
     }      &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
   }      ['problemmode']);
       if (!(defined $ENV{'form.problemmode'})) {
   if ($ENV{'request.state'} eq "construct") {   #first visit to problem in construction space
     if ( -e $file ) {   #&view_or_edit_menu($request);
       if (!(defined $ENV{'form.problemmode'})) {   $ENV{'form.problemmode'}='View';
  #first visit to problem in construction space   &renderpage($request,$file);
  &view_or_edit_menu($request);      } elsif ($ENV{'form.problemmode'} eq &mt('EditXML')) {
  #&renderpage($request,$file);   &editxmlmode($request,$file);
       } else {      } elsif ($ENV{'form.problemmode'} eq &mt('Calculate answers')) {
  &renderpage($request,$file);   &analyze($request,$file);
       }      } else {
    &renderpage($request,$file);
       }
    } else {
       # requested file doesn't exist in contruction space
       &newproblem($request);
    }
     } else {      } else {
       # requested file doesn't exist in contruction space   # just render the page normally outside of construction space
       &newproblem($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 $td seconds processing");
     &renderpage($request,$file);      # &Apache::lonhomework::send_footer($request);
   }      # always turn off debug messages
   #my $td=&tv_interval($t0);      $Apache::lonxml::debug=0;
   #&Apache::lonxml::debug("Spent $td seconds processing");      return OK;
   # &Apache::lonhomework::send_footer($request);  
   # always turn off debug messages  
   $Apache::lonxml::debug=0;  
   return OK;  
   
 }  }
   
Removed from v.1.60  
changed lines
  Added in v.1.176

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