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version 1.51, 2001/08/06 18:24:37 version 1.134, 2003/06/13 20:50:57
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 # The LON-CAPA homework handler  # The LearningOnline Network with CAPA
 #   # The LON-CAPA Homework handler
 # Handles homework.  
 #  #
 # YEAR=2000  # $Id$
 # 7/25,8/2,8/7,8/8,8/11,9/14,9/19,10/2,10/5,10/11,11/7,11/21 Guy Albertelli  #
   # 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/
   #
   # Guy Albertelli
 # 11/30 Gerd Kortemeyer  # 11/30 Gerd Kortemeyer
 # 12/4,12/8,12/12,12/15,12/19,12/21 Guy Albertelli  # 6/1,8/17,8/18 Gerd Kortemeyer
 # YEAR=2001  # 7/18 Jeremy Bowers
 # 1/6,1/8,1/9,1/10,1/11,1/12,1/15,1/25,2/7,2/13,2/19,4/16,4/26 Guy Albertelli  
 # 5/4,5/13,5/21 Guy Albertelli  
 # 6/1 Gerd Kortemeyer  
 # 6/5,6/12,6/26,7/2,7/18 Guy Albertelli  
 # 8/6 Scott Harrison  
   
 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::response;  use Apache::structuretags();
 use Apache::hint;  use Apache::randomlabel();
 use Apache::outputtags;  use Apache::response();
   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::Constants qw(:common);  use Apache::Constants qw(:common);
   use HTML::Entities();
   use Apache::loncommon();
 #use Time::HiRes qw( gettimeofday tv_interval );  #use Time::HiRes qw( gettimeofday tv_interval );
   
 # ======================================================================= BEGIN  BEGIN {
 sub BEGIN {  
   &Apache::lonxml::register_insert();    &Apache::lonxml::register_insert();
 }  }
   
 # =============================================== Get target (returns an array)  
 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($ENV{'form.grade_target'}  ) 
    && ($ENV{'form.grade_target'} eq 'tex')) {
         return ($ENV{'form.grade_target'});
       } elsif ( defined($ENV{'form.grade_target'}  ) 
    && ($Apache::lonhomework::viewgrades eq 'F' )) {
         return ($ENV{'form.grade_target'});
       }
    
       if ( defined($ENV{'form.submitted'}) &&
    ( !defined($ENV{'form.resetdata'}))) {
         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'}) &&
        (!defined($ENV{'form.resetdata'})) ) {
     return ('grade', 'web','answer');
  } else {   } else {
     return ('web');    return ('web','answer');
  }   }
     } elsif ($ENV{'request.state'} eq "construct") {        } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
  if ( defined $ENV{'form.preview'}) {   if ( $ENV{'form.submitted'} eq 'edit' ) {
     if ( defined $ENV{'form.submitted'}) {    if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
  return ('grade','web');      return ('modified','web','answer');
     } else {    } else {
  return ('web');      return ('modified','edit');
     }    }
  } else {   } else {
     if ( $ENV{'form.problemmode'} eq 'View' ) {    return ('edit');
  if ( defined $ENV{'form.submitted'}) {  
     return ('grade','web');  
  } else {  
     return ('web');  
  }  
     } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {  
  if ( $ENV{'form.submitted'} eq 'edit' ) {  
     return ('modified','edit');  
  } else {  
     return ('edit');  
  }  
     } else {  
  return ('web');  
     }  
  }   }
         } else {
    return ('web');
         }
     }      }
     return ();    }
     return ();
 }  }
   
 # ===================================== Set up variables (return scalar string)  
 sub setup_vars {  sub setup_vars {
     my ($target) = @_;    my ($target) = @_;
     return ';'    return ';'
 #  return ';$external::target='.$target.';';  #  return ';$external::target='.$target.';';
 }  }
   
 # ================================================================= Send header  
 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.'">');
 }  }
   
 # ================================================================= Create menu  
 sub createmenu {  sub createmenu {
     my ($which,$request) = @_;    my ($which,$request)=@_;
     if ($which eq 'grade') {    if ($which eq 'grade') {
  $request->print('<script language="JavaScript">'."\n".      $request->print('<script language="JavaScript"> 
         'hwkmenu=window.open("/res/adm/pages/homeworkmenu.html'.            hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
       '","homeworkremote","height=350,width=150,menubar=no");'.                   "height=350,width=150,menubar=no");
       '</script>');            </script>');
     }    }
 }  }
   
 # ================================================================= Send footer  
 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='';
   
 # =============================================== Check date (returns an array)  # JB, 9/24/2002: Any changes in this function may require a change
 sub check_date {  # in lonnavmaps::resource::getDateStatus.
     my ($id) = @_;  sub check_access {
     my $date ='';    my ($id) = @_;
     my $status = '';    my $date ='';
     my $datemsg = '';    my $status;
     my $lastdate = '';    my $datemsg = '';
     my $temp;    my $lastdate = '';
     my $type;    my $temp;
     my $passed;    my $type;
     &Apache::lonxml::debug("checking for part :$id:");    my $passed;
     foreach $temp ("opendate","duedate","answerdate") {  
  $lastdate = $date;    if ($ENV{'request.state'} eq "construct") {
  $date = &Apache::lonnet::EXT("resource.$id.$temp");      &Apache::lonxml::debug("in construction ignoring dates");
  &Apache::lonxml::debug("found :$date: for :$temp:");      $status='CAN_ANSWER';
  if ($date eq '') {      $datemsg='is in under construction';
     $date = "an unknown date"; $passed = 0;      return ($status,$datemsg);
  } elsif ($date eq 'con_lost') {    }
     $date = "an indeterminate date"; $passed = 0;  
  } else {    &Apache::lonxml::debug("checking for part :$id:");
     if (time < $date) { $passed = 0; } else { $passed = 1; }    &Apache::lonxml::debug("time:".time);
     $date = localtime $date;    foreach $temp ("opendate","duedate","answerdate") {
  }      $lastdate = $date;
  if (!$passed) { $type = $temp; last; }      $date = &Apache::lonnet::EXT("resource.$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';
    $date="may open later.";
    return($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 = "an unknown date"; $passed = 0;
       } elsif ($date eq 'con_lost') {
         $date = "an indeterminate date"; $passed = 0;
       } else {
         if (time < $date) { $passed = 0; } else { $passed = 1; }
         $date = localtime $date;
     }      }
     &Apache::lonxml::debug("have :$type:$passed:");      if (!$passed) { $type=$temp; last; }
     if ($passed) {    }
  $status = 'SHOW_ANSWER';    &Apache::lonxml::debug("have :$type:$passed:");
  $datemsg = $date;    if ($passed) {
     } elsif ($type eq 'opendate') {      $status='SHOW_ANSWER';
  $status = 'CLOSED';      $datemsg=$date;
  $datemsg = "will open on $date";    } elsif ($type eq 'opendate') {
     } elsif ($type eq 'duedate') {      $status='CLOSED';
  $status = 'CAN_ANSWER';      $datemsg = "will open on $date";
  $datemsg = "is due at $date";    } elsif ($type eq 'duedate') {
     } elsif ($type eq 'answerdate') {      $status='CAN_ANSWER';
  $status = 'CLOSED';      $datemsg = "is due at $date";
  $datemsg = "was due on $lastdate, and answers will be available on ".    } elsif ($type eq 'answerdate') {
            "$date";      $status='CLOSED';
     }      $datemsg = "was due on $lastdate, and answers will be available on $date";
     if ($status eq 'CAN_ANSWER') {    }
  #check #tries    if ($status eq 'CAN_ANSWER') {
  my $tries = $Apache::lonhomework::history{"resource.$id.tries"};      #check #tries, and if correct.
  my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");      my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
  if ( $tries eq '' ) { $tries = '0'; }      my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
  if ( $maxtries eq '' ) { $maxtries = '2'; }       if ( $tries eq '' ) { $tries = '0'; }
  if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }       if ( $maxtries eq '' ) { $maxtries = '2'; } 
     }      if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
     &Apache::lonxml::debug("sending back :$status:$datemsg:");      # if (correct and show prob status) or excused then CANNOT_ANSWER
     if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {      if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
  &Apache::lonxml::debug("should be allowed to browse a resource when ".   &&
        "closed");   lc($Apache::lonhomework::problemstatus) ne 'no')
  $status = 'CAN_ANSWER';         ||
  $datemsg = 'is closed but you are allowed to view it';         $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
     }   $status = 'CANNOT_ANSWER';
     if ($ENV{'request.state'} eq "construct") {  
  &Apache::lonxml::debug("in construction ignoring dates");  
  $status = 'CAN_ANSWER';  
  $datemsg = 'is in under construction';  
     }      }
     return ($status,$datemsg);    }
   
     #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';
     }
   
     return ($status,$datemsg);
 }  }
   
 # ================================================================== Shows hash  
 sub showhash {  sub showhash {
     my (%hash) = @_;    my (%hash) = @_;
     my $resultkey;    &showhashsubset(\%hash,'.');
     foreach $resultkey (sort keys %hash) {    return '';
  &Apache::lonxml::debug("$resultkey ---- $hash{$resultkey}");  }
   
   sub showarray {
       my ($array)=@_;
       my $string="(";
       foreach my $elm (@{ $array }) {
    if (ref($elm)) {
       if ($elm =~ /ARRAY/ ) {
    $string.=&showarray($elm);
       }
    } else {
       $string.="$elm,"
    }
     }      }
     &Apache::lonxml::debug("\n<br />restored values^</br>\n");      chop($string);
     return '';      $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 '';
 }  }
   
 # =========================================================== Setup permissions  
 sub setuppermissions {  sub setuppermissions {
     $Apache::lonhomework::browse = &Apache::lonnet::allowed('bre',    $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
      $ENV{'request.filename'});    my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
     $Apache::lonhomework::viewgrades = &Apache::lonnet::allowed('vgr',    if (! $viewgrades && 
     $ENV{'request.course.id'});        exists($ENV{'request.course.sec'}) && 
     return '';        $ENV{'request.course.sec'} !~ /^\s*$/) {
         $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
                                                  '/'.$ENV{'request.course.sec'});
     }
     $Apache::lonhomework::viewgrades = $viewgrades;
     return ''
 }  }
   
 # ================================================================ Setup header  
 sub setupheader {  sub setupheader {
     my $request = $_[0];      my $request=$_[0];
     if ($ENV{'browser.mathml'}) {      if ($ENV{'browser.mathml'}) {
  $request->content_type('text/xml');   $request->content_type('text/xml');
     } else {      } else {
  $request->content_type('text/html');   $request->content_type('text/html');
     }      }
       $request->content_encoding('UTF-8');
       if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
    &Apache::loncommon::no_cache($request);
       }
     $request->send_http_header;      $request->send_http_header;
     return OK if $request->header_only;      return OK if $request->header_only;
     return '';      return ''
 }  }
   
 # ========================================================= Handle save or undo  
 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";
     if ($ENV{'form.Undo'} eq 'undo') {    my $filetmp =$file.".tmp";
  if (copy($filesave,$fileout)) {    my $error=0;
     $request->print("<b>Undid changes, Copied $filesave to $fileout".  
     "<br /></b>");    if ($ENV{'form.Undo'} eq 'undo') {
  } else {      my $error=0;
     $request->print("<font color=\"red\" size=\"+1\"><b>Unable to ".      if (!copy($file,$filetmp)) { $error=1; }
     "undo, unable to copy $filesave to $fileout<br ".      if ((!$error) && (!copy($filebak,$file))) { $error=1; }
     "/></b></font>");      if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
  }      if (!$error) {
         $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
     } else {      } else {
  my $fs=Apache::File->new(">$filesave");        $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
  if (defined($fs)) {        $error=1;
     print $fs $$problem;  
     $request->print("<b>Making Backup to $filesave</b><br />");  
  } else {  
     $request->print("<font color=\"red\" size=\"+1\"><b>Unable to ".  
     "make backup $filesave</b></font>");  
  }  
  my $fh=Apache::File->new(">$fileout");  
  if (defined($fh)) {  
     print $fh $$result;  
     $request->print("<b>Saving Modifications to $fileout</b><br />");  
  } else {  
     $request->print("<font color=\"red\" size=\"+1\"><b>Unable to ".  
     "write to $fileout</b></font>");  
  }  
     }      }
     } else {
       my $fs=Apache::File->new(">$filebak");
       if (defined($fs)) {
         print $fs $$problem;
         $request->print("<b>Making Backup to $filebak</b><br />");
       } else {
         $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
         $error=2;
       }
       my $fh=Apache::File->new(">$file");
       if (defined($fh)) {
         print $fh $$result;
         $request->print("<b>Saving Modifications to $file</b><br />");
       } else {
         $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
         $error|=4;
       }
     }
     return $error;
 }  }
   
 # ================================================================= Render page  sub analyze_header {
 sub renderpage {      my ($request) = @_;
       my $result.='<html>
               <head><title>Analyzing a problem</title></head>
               <body bgcolor="#FFFFFF">
               <form name="lonhomework" method="POST" action="'.
         $ENV{'request.uri'}.'">
               <input type="submit" name="problemmode" value="EditXML" />
               <input type="submit" name="problemmode" value="Edit" />
               <hr />
               <input type="submit" name="submit" value="View" />
               <hr />
               List of possible answers:
               </form>';
       $request->print($result);
       $request->rflush();
   }
   
   sub analyze_footer {
       my ($request) = @_;
       my $result='</body></html>';
       $request->print($result);
       $request->rflush();
   }
   
   sub analyze {
     my ($request,$file) = @_;      my ($request,$file) = @_;
           &Apache::lonxml::debug("Analyze");
     my (@targets) = &get_target();      my $result;
     foreach my $target (@targets) {      my %overall;
  #my $t0 = [&gettimeofday()];      my %allparts;
  my $problem=&Apache::lonnet::getfile($file);      my $rndseed=$ENV{'form.rndseed'};
  if ($problem == -1) {      &analyze_header($request);
     &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");      my %prog_state=
     $problem='';   &Apache::lonhtmlcommon::Create_PrgWin($request,'Analyze Progress',
  }        'Getting Problem Variants',
         $ENV{'form.numtoanalyze'});
  my %mystyle;      for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
  my $result = '';   &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
  &Apache::inputtags::initialize_inputtags;   'last problem');
  &Apache::edit::initialize_edit;   my $subresult=&Apache::lonnet::ssi($request->uri,
  %Apache::lonhomework::results=();     ('grade_target' => 'analyze'),
  %Apache::lonhomework::history=&Apache::lonnet::restore();     ('rndseed' => $i+$rndseed));
  #ignore error conditions   (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
  my ($temp)=keys %Apache::lonhomework::history ;   my %analyze=&Apache::lonnet::str2hash($subresult);
  if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }    my @parts;
  if ($target eq 'web') {   if (defined(@{ $analyze{'parts'} })) {
     if (&Apache::lonnet::symbread() eq '') {      @parts=@{ $analyze{'parts'} };
  if ($ENV{'request.state'} eq "construct") {   }
     $request->print("In construction space, submissions ".   foreach my $part (@parts) {
     "ignored<br />");      if (!exists($allparts{$part})) {$allparts{$part}=1;};
  } else {      if ($analyze{$part.'.type'} eq 'numericalresponse' ||
     $request->print("Browsing or <a href=\"/adm/ambiguous\">".   $analyze{$part.'.type'} eq 'stringresponse' ||
     "ambiguous</a> reference, submissions ".   $analyze{$part.'.type'} eq 'formularesponse'   ) {
     "ignored<br />");   push( @{ $overall{$part.'.answer'} },
  }        [@{ $analyze{$part.'.answer'} }]);
     }      }
     #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }  
  }  
  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,      }
     $default.&setup_vars($target),      &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
     %mystyle);    'Analyzing Results');
  #$request->print("Result follows:");      foreach my $part (sort(keys(%allparts))) {
  if ($target eq 'modified') {   if (defined(@{ $overall{$part.'.answer'} })) {
     &handle_save_or_undo($request,\$problem,\$result);      my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
       $request->print('<table><tr><td colspan="'.($num_cols+1).'">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).'">Answer</td><td>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 {   } else {
     #my $td=&tv_interval($t0);      $request->print('<p>Part '.$part.
     #if ( $Apache::lonxml::debug) {      ' is not analyzable at this time</p>');
     #$result =~ s:</body>::;  
     #$result.="<br />Spent $td seconds processing target $target\n</body>";  
     #}  
     $request->print($result);  
  }  
  #$request->print(":Result ends");  
  if ($target eq 'grade') { &showhash(%Apache::lonhomework::results); }  
   
  #store new values  
  my ($temp) = keys %Apache::lonhomework::results;  
  if ( $temp ne '' ) {  
     &Apache::lonxml::debug("Store return message:".  
       &Apache::lonnet::cstore(\%Apache::lonhomework::results));  
  }   }
  #my $td=&tv_interval($t0);  
     }      }
       if (scalar(keys(%allparts)) == 0 ) {
    $request->print('<p>Found no analyzable parts in this problem,
                            currently only Numerical, Formula and String response
                            styles are supported.</p>');
       }
       &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
       &analyze_footer($request);
       &Apache::lonhomework::showhash(%overall);
       return $result;
   }
   
   sub editxmlmode {
     my ($request,$file) = @_;
     my $result;
     my $problem=&Apache::lonnet::getfile($file);
     if ($problem eq -1) {
       &Apache::lonxml::error("<b> Unable to find <i>$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 'Submit Changes and View' ) {
       &Apache::lonhomework::showhashsubset(\%ENV,'^form');
       $ENV{'form.problemmode'}='View';
       &renderpage($request,$file);
     } else {
       my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
       my $xml_help = '<table><tr><td>'.
    &Apache::loncommon::help_open_topic("Problem_Editor_XML_Index",'Problem Editing Help')
       .'</td><td>'.
    &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
       undef,undef,600)
       .'</td><td>'.
           &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
       undef,undef,600)
       .'</td></tr></table>';
       if ($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="'.
         $ENV{'request.uri'}.'">
               <input type="hidden" name="problemmode" value="EditXML" />
               <input type="submit" name="problemmode" value="Discard Edits and View" />
               <input type="submit" name="problemmode" value="Edit" />
               <hr />
               <input type="submit" name="submit" value="Submit Changes" />
               <input type="submit" name="submit" value="Submit Changes and View" />
               <input type="submit" name="Undo" value="undo" />
               <hr />
               ' . $xml_help . '
               <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
         &HTML::Entities::encode($problem).'</textarea>
               </form></body></html>';
       $request->print($result);
     }
     return '';
   }
   
   sub renderpage {
     my ($request,$file) = @_;
   
     my (@targets) = &get_target();
     &Apache::lonxml::debug("Running targets ".join(':',@targets));
     foreach my $target (@targets) {
       #my $t0 = [&gettimeofday()];
       my $problem=&Apache::lonnet::getfile($file);
       if ($problem eq -1) {
         &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
         $problem='';
       }
   
       my %mystyle;
       my $result = '';
       if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
       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, $problem,
    &setup_vars($target),%mystyle);
       undef($Apache::lonhomework::parsing_a_problem);
       #$request->print("Result follows:");
       if ($target eq 'modified') {
         &handle_save_or_undo($request,\$problem,\$result);
       } else {
         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);
         $request->rflush();
       }
       #$request->print(":Result ends");
       #my $td=&tv_interval($t0);
     }
 }  }
   
 # =========================================================== Get template list  
 # 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 $file    &Apache::lonxml::debug("Looking for :$extension:");
  (</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 {
     $result.="<option>$name</option>";   if ($name) { push (@allnames, $name); }
  }  
     }      }
     return $result;    }
     if (@allnames && !$result) {
       $result="<option>Select a $extension template</option>\n<option>".
    join('</option><option>',sort(@allnames)).'</option>';
     }
     return $result;
 }  }
   
 # ================================================================= New problem  
 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'}) {      my $templatelist=&get_template_list('',$extension);
       if ($ENV{'form.template'} &&
    $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($request,$file);   &renderpage($request,$dest);
       } elsif($ENV{'form.newfile'} && !$templatelist) {
    # I don't like hard-coded filenames but for now, this will work.
    use File::Copy;
    my $templatefilename =
       $request->dir_config('lonIncludes').'/templates/blank.problem';
    &Apache::lonxml::debug("$templatefilename");
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    copy($templatefilename,$dest);
    &renderpage($request,$dest);
     } else {      } else {
  my $templatelist = &get_template_list('',$extension);   my $url=$request->uri;
  my $url = $request->uri;  
  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">You did not select a template.</font></p>'."\n";
    }
    my $instructions;
    if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
  $request->print(<<ENDNEWPROBLEM);   $request->print(<<ENDNEWPROBLEM);
 <body bgcolor="#FFFFFF">  <body bgcolor="#FFFFFF">
 The request file $url doesn\'t exist. You can create a new $extension <br />  <h1>Creating a new $extension resource</h1>
 <form action="$url" method="POST">  $errormsg
 <input type="submit" value="New $extension"><br />  The requested file <tt>$url</tt> currently does not exist.
 <select name="template">  <p>
 $templatelist  <b>To create a new $extension$instructions click on the "Create $extension" button.</b>
 </select>  </p>
 </form>  <p><form action="$url" method="POST">
 </body>  
 ENDNEWPROBLEM  ENDNEWPROBLEM
   }   if (defined($templatelist)) {
       $request->print("<select name=\"template\">$templatelist</select>");
   return '';   }
    $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"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 $url=$request->uri;
     $request->print(<<EDITMENU);    $request->print(<<EDITMENU);
 <body bgcolor="#FFFFFF">  <body bgcolor="#FFFFFF">
 <form action="$url" method="POST">  <form action="$url" method="POST">
 Would you like to <input type="submit" name="problemmode" value="View"> or  Would you like to <input type="submit" name="problemmode" value="View"> or
Line 367  Would you like to <input type="submit" n Line 631  Would you like to <input type="submit" n
 EDITMENU  EDITMENU
 }  }
   
 # ===================================================================== Handler  
 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    #setup permissions
     $Apache::lonhomework::browse = &Apache::lonnet::allowed('bre',    $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
      $ENV{'request.filename'});    $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
     $Apache::lonhomework::viewgrades = &Apache::lonnet::allowed('vgr',    &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
     $ENV{'request.course.id'});    # some times multiple problemmodes are submitted, need to select
     &Apache::lonxml::debug("Permissions:".    # the last one
    $Apache::lonhomework::browse.":".    &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
    $Apache::lonhomework::viewgrades.":");    if ( defined($ENV{'form.problemmode'}) &&
          ref($ENV{'form.problemmode'}) ) {
     my $file = &Apache::lonnet::filelocation("",$request->uri);      &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
       my $mode=$ENV{'form.problemmode'}->[-1];
     #check if we know where we are      undef $ENV{'form.problemmode'};
     if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {       $ENV{'form.problemmode'}=$mode;
  # if we are browsing we might not be able to know where we are    }
  if ($Apache::lonhomework::browse ne 'F') {    &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
     #should know where we are, so ask    my $file=&Apache::lonnet::filelocation("",$request->uri);
     $request->internal_redirect('/adm/ambiguous'); return;  
  }    #check if we know where we are
     if ($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
         $request->internal_redirect('/adm/ambiguous'); return;
     }      }
     }
   
     if ($ENV{'request.state'} eq "construct") {    my ($symb) = &Apache::lonxml::whichuser();
  if ( -e $file ) {    &Apache::lonxml::debug('symb is '.$symb);
     if (!(defined $ENV{'form.problemmode'})) {    if ($ENV{'request.state'} eq "construct" || $symb eq '') {
  #first visit to problem in construction space        if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
  &view_or_edit_menu($request);    $ENV{'form.resetdata'} eq 'New Problem Variation' ) {
  #&renderpage($request,$file);    my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
     } else {    &Apache::lonnet::tmpreset($symb,'',$domain,$name);
  &renderpage($request,$file);  
       }        }
  } else {    }
     # requested file doesn't exist in contruction space    if ($ENV{'request.state'} eq "construct") {
     &newproblem($request);      if ( -e $file ) {
  }        if (!(defined $ENV{'form.problemmode'})) {
     } else {   #first visit to problem in construction space
  # just render the page normally outside of construction space   #&view_or_edit_menu($request);
    $ENV{'form.problemmode'}='View';
    &renderpage($request,$file);
         } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
    &editxmlmode($request,$file);
         } elsif ($ENV{'form.problemmode'} eq 'Calculate answers') {
    &analyze($request,$file);
         } else {
  &renderpage($request,$file);   &renderpage($request,$file);
         }
       } else {
         # requested file doesn't exist in contruction space
         &newproblem($request);
     }      }
     #my $td=&tv_interval($t0);    } else {
     #&Apache::lonxml::debug("Spent $td seconds processing");      # just render the page normally outside of construction space
     # &Apache::lonhomework::send_footer($request);      &Apache::lonxml::debug("not construct");
     # always turn off debug messages      &renderpage($request,$file);
     $Apache::lonxml::debug=0;    }
     return OK;    #my $td=&tv_interval($t0);
     #&Apache::lonxml::debug("Spent $td seconds processing");
     # &Apache::lonhomework::send_footer($request);
     # always turn off debug messages
     $Apache::lonxml::debug=0;
     return OK;
   
 }  }
   
 1;  1;
   
 __END__  __END__
Removed from v.1.51  
changed lines
  Added in v.1.134

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