[BACK]Return to response.pm CVS log [TXT] [DIR] Up to [LON-CAPA] / loncom / homework

Diff for /loncom/homework/response.pm between versions 1.90 and 1.220

version 1.90, 2004/02/09 19:38:00 version 1.220, 2010/11/24 00:10:06
Line 26 Line 26
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
   
   =pod
   
   =head1 NAME
   
   Apache::response.pm
   
   =head1 SYNOPSIS
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   
   =head1 NOTABLE SUBROUTINES
   
   =over
   
   =item 
   
   =back
   
   =cut
   
   
 package Apache::response;  package Apache::response;
 use strict;  use strict;
   use Apache::lonlocal;
   use Apache::lonnet;
   use Apache::lonmaxima();
   use Apache::lonr();
   
 BEGIN {  BEGIN {
     &Apache::lonxml::register('Apache::response',('responseparam','parameter','dataresponse'));      &Apache::lonxml::register('Apache::response',('responseparam','parameter','dataresponse','customresponse','mathresponse'));
 }  }
   
 sub start_response {  sub start_response {
     my ($parstack,$safeeval)=@_;      my ($parstack,$safeeval)=@_;
     my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);      my $id = &Apache::lonxml::get_id($parstack,$safeeval);
     if ($id eq '') { $id = $Apache::lonxml::curdepth; }  
     if ($#Apache::inputtags::import > -1) {      if ($#Apache::inputtags::import > -1) {
  &Apache::lonxml::debug("Turning :$id: into");   &Apache::lonxml::debug("Turning :$id: into");
  $id = join('_',@Apache::inputtags::import).'_'.$id;   $id = join('_',@Apache::inputtags::import).'_'.$id;
Line 45  sub start_response { Line 71  sub start_response {
     push (@Apache::inputtags::response,$id);      push (@Apache::inputtags::response,$id);
     push (@Apache::inputtags::responselist,$id);      push (@Apache::inputtags::responselist,$id);
     @Apache::inputtags::inputlist=();      @Apache::inputtags::inputlist=();
       if ($Apache::inputtags::part eq '' && 
    !$Apache::lonhomework::ignore_response_errors) {
    &Apache::lonxml::error(&HTML::Entities::encode(&mt("Found a <*response> outside of a <part> in a <part>ed problem"),'<>&"'));
       }
       if ($Apache::inputtags::response_with_no_part &&
    $Apache::inputtags::part ne '0') {
    &Apache::lonxml::error(&HTML::Entities::encode(&mt("<*response>s are both inside of <part> and outside of <part>, this is not a valid problem, errors in grading may occur."),'<>&"').'<br />');
       }
       if ($Apache::inputtags::part eq '0') {
    $Apache::inputtags::response_with_no_part=1;
       }
     return $id;      return $id;
 }  }
   
Line 56  sub end_response { Line 93  sub end_response {
   
 sub start_hintresponse {  sub start_hintresponse {
     my ($parstack,$safeeval)=@_;      my ($parstack,$safeeval)=@_;
     my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);      my $id = &Apache::lonxml::get_id($parstack,$safeeval);
     if ($id eq '') { $id = $Apache::lonxml::curdepth; }      push (@Apache::inputtags::hint,$id);
     push (@Apache::inputtags::response,$id);      push (@Apache::inputtags::hintlist,$id);
     push (@Apache::inputtags::responselist,$id);  
     push (@Apache::inputtags::paramstack,[%Apache::inputtags::params]);      push (@Apache::inputtags::paramstack,[%Apache::inputtags::params]);
     return $id;      return $id;
 }  }
   
 sub end_hintresponse {  sub end_hintresponse {
     pop @Apache::inputtags::response;      pop @Apache::inputtags::hint;
     if (defined($Apache::inputtags::paramstack[-1])) {      if (defined($Apache::inputtags::paramstack[-1])) {
  %Apache::inputtags::params=   %Apache::inputtags::params=
     @{ pop(@Apache::inputtags::paramstack) };      @{ pop(@Apache::inputtags::paramstack) };
Line 73  sub end_hintresponse { Line 109  sub end_hintresponse {
     return '';      return '';
 }  }
   
 # used by response to set the non-safe space random number generator to something  my @randomseeds;
 # that is stable and unique based on the part number and response number  sub pushrandomnumber {
       my $rand_alg=&Apache::lonnet::get_rand_alg();
       if (!$rand_alg || $rand_alg eq '32bit' || $rand_alg eq '64bit' ||
    $rand_alg eq '64bit2') {
    # do nothing
       } else {
    my @seed=&Math::Random::random_get_seed();
    push(@randomseeds,\@seed);
       }
       &Apache::response::setrandomnumber(@_);
   }
   sub poprandomnumber {
       my $rand_alg=&Apache::lonnet::get_rand_alg();
       if (!$rand_alg || $rand_alg eq '32bit' || $rand_alg eq '64bit' ||
    $rand_alg eq '64bit2') {
    return;
       }
       my $seed=pop(@randomseeds);
       if ($seed) {
    &Math::Random::random_set_seed(@$seed);
       } else {
    &Apache::lonxml::error("Unable to restore random algorithm.");
       }
   }
   
 sub setrandomnumber {  sub setrandomnumber {
       my ($ignore_id2) = @_;
     my $rndseed;      my $rndseed;
     $rndseed=&Apache::structuretags::setup_rndseed();      $rndseed=&Apache::structuretags::setup_rndseed();
     if (!defined($rndseed)) { $rndseed=&Apache::lonnet::rndseed(); }      if (!defined($rndseed)) { $rndseed=&Apache::lonnet::rndseed(); }
     &Apache::lonxml::debug("randseed $rndseed");      &Apache::lonxml::debug("randseed $rndseed");
     #  $rndseed=unpack("%32i",$rndseed);      #  $rndseed=unpack("%32i",$rndseed);
     my $rndmod=(&Apache::lonnet::numval($Apache::inputtags::part) << 10);      my $rand_alg=&Apache::lonnet::get_rand_alg();
     if (defined($Apache::inputtags::response['-1'])) {      my ($rndmod,$rndmod2);
  $rndmod+=&Apache::lonnet::numval($Apache::inputtags::response[-1]);  
     }      my ($id1,$id2,$shift_amt);
     if ($rndseed =~/,/) {      if ($Apache::lonhomework::parsing_a_problem) {
  {   $id1=$Apache::inputtags::part;
     use integer;   if (defined($Apache::inputtags::response[-1])) {
     my ($num1,$num2)=split(/,/,$rndseed);      $id2=$Apache::inputtags::response[-1];
     $num1+=$rndmod;   }
     $num2+=$rndmod;   $shift_amt=scalar(@Apache::inputtags::responselist);
     $rndseed="$num1,$num2";      } elsif ($Apache::lonhomework::parsing_a_task) {
    $id1=&Apache::bridgetask::get_dim_id();
    if (!$ignore_id2 && ref($Apache::bridgetask::instance{$id1})) {
       $id2=$Apache::bridgetask::instance{$id1}[-1];
       $shift_amt=scalar(@{$Apache::bridgetask::instance{$id1}});
    } else {
       $shift_amt=0;
    }
       } 
       &Apache::lonxml::debug("id1: $id1, id2: $id2, shift_amt: $shift_amt");
       if (!$rand_alg || $rand_alg eq '32bit' || $rand_alg eq '64bit' ||
    $rand_alg eq '64bit2') {
    $rndmod=(&Apache::lonnet::numval($id1) << 10);
    if (defined($id2)) { $rndmod+=&Apache::lonnet::numval($id2); }
       } elsif ($rand_alg eq '64bit3') {
    $rndmod=(&Apache::lonnet::numval2($id1) << 10);
    if (defined($id2)) { $rndmod+=&Apache::lonnet::numval2($id2); }
       } elsif ($rand_alg eq '64bit4') {
    my $shift=(4*$shift_amt)%30;
    $rndmod=(&Apache::lonnet::numval3($id1) << (($shift+15)%30));
    if (defined($id2)) {
       $rndmod+=(&Apache::lonnet::numval3($id2) << $shift );
  }   }
     } else {      } else {
    ($rndmod,$rndmod2)=&Apache::lonnet::digest("$id1,$id2");
       }
   
       if ($rndseed =~/([,:])/) {
    my $char=$1;
    use integer;
    my ($num1,$num2)=split(/\Q$char\E/,$rndseed);
    $num1+=$rndmod;
    $num2+= ((defined($rndmod2)) ? $rndmod2 : $rndmod);
    if($Apache::lonnet::_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
    $rndseed=$num1.$char.$num2;
       } else {
  $rndseed+=$rndmod;   $rndseed+=$rndmod;
    if($Apache::lonnet::_64bit) {
       use integer;
       $rndseed=(($rndseed<<32)>>32);
    }
     }      }
       &Apache::lonxml::debug("randseed $rndmod $rndseed");
     &Apache::lonnet::setup_random_from_rndseed($rndseed);      &Apache::lonnet::setup_random_from_rndseed($rndseed);
     &Apache::lonxml::debug("randseed $rndseed");  
     return '';      return '';
 }  }
   
Line 142  sub meta_stores_write { Line 240  sub meta_stores_write {
       "></stores>\n";        "></stores>\n";
 }  }
   
   =pod
   
   =item mandatory_part_meta()
   
   Autogenerate metadata for mandatory
   input (from RAT or lonparmset) and
   output (to lonspreadsheet)
   of each part
   
   Note: responseid-specific data 'submission' and 'awarddetail'
   not available to spreadsheet -> skip here
   
   =cut
   
   
 sub mandatory_part_meta {  sub mandatory_part_meta {
 #      return &meta_package_write('part').
 # Autogenerate metadata for mandatory             &meta_stores_write('solved','string','Problem Status').
 # input (from RAT or lonparmset) and              &meta_stores_write('tries','int_zeropos','Number of Attempts').
 # output (to lonspreadsheet)             &meta_stores_write('awarded','float','Partial Credit Factor');
 # of each part  
 #  
     return  
 #    &meta_parameter_write('opendate','date_start','',  
 #                          'Opening Date').  
 #    &meta_parameter_write('duedate','date_end','',  
 #                          'Due Date').  
 #    &meta_parameter_write('answerdate','date_start','',  
 #                          'Show Answer Date').  
 #    &meta_parameter_write('weight','int_zeropos','',  
 #                          'Available Points').  
 #    &meta_parameter_write('maxtries','int_pos','',  
 #                          'Maximum Number of Tries').  
  &meta_package_write('part').  
         &meta_stores_write('solved','string',  
    'Problem Status').  
         &meta_stores_write('tries','int_zeropos',  
    'Number of Attempts').  
         &meta_stores_write('awarded','float',  
    'Partial Credit Factor');  
 #  
 # Note: responseid-specific data 'submission' and 'awarddetail'  
 # not available to spreadsheet -> skip here  
 #  
 }  }
   
 sub meta_part_order {  sub meta_part_order {
     if (@Apache::inputtags::partlist) {      if (@Apache::inputtags::partlist) {
  my @parts=@Apache::inputtags::partlist;   my @parts=@Apache::inputtags::partlist;
  shift(@parts);   shift(@parts);
  return '<partorder>'.join(',',@parts).'</partorder>';   return '<partorder>'.join(',',@parts).'</partorder>'."\n";
     } else {      } else {
  return '<partorder>0</partorder>';   return '<partorder>0</partorder>'."\n";
       }
   }
   
   sub meta_response_order {
       if (@Apache::inputtags::responselist) {
    return '<responseorder>'.join(',',@Apache::inputtags::responselist).
       '</responseorder>'."\n";
     }      }
 }  }
   
 sub check_for_previous {  sub check_for_previous {
     my ($curresponse,$partid,$id) = @_;      my ($curresponse,$partid,$id,$last,$type) = @_;
     my %previous;      my %previous;
     $previous{'used'} = 0;      $previous{'used'} = 0;
     foreach my $key (sort(keys(%Apache::lonhomework::history))) {      foreach my $key (sort(keys(%Apache::lonhomework::history))) {
  if ($key =~ /resource\.$partid\.$id\.submission/) {   if ($key =~ /resource\.\Q$partid\E\.\Q$id\E\.submission$/) {
       if ( $last && $key =~ /^(\d+):/ ) {
    next if ($1 >= $last);
       }
     &Apache::lonxml::debug("Trying $key");      &Apache::lonxml::debug("Trying $key");
     my $pastresponse=$Apache::lonhomework::history{$key};      my $pastresponse=$Apache::lonhomework::history{$key};
     if ($pastresponse eq $curresponse) {      if ($pastresponse eq $curresponse) {
Line 204  sub check_for_previous { Line 303  sub check_for_previous {
     $previous{'last'}='1';      $previous{'last'}='1';
  }   }
  if (! $previous{'award'} ) { $previous{'award'} = 'UNKNOWN'; }   if (! $previous{'award'} ) { $previous{'award'} = 'UNKNOWN'; }
                   if ($previous{'award'} eq 'INTERNAL_ERROR') { $previous{'used'}=0; }
  &Apache::lonxml::debug("got a match :$previous{'award'}:$previous{'used'}:");   &Apache::lonxml::debug("got a match :$previous{'award'}:$previous{'used'}:");
     }              } elsif ($type eq 'ci') {
                   if (lc($pastresponse) eq lc($curresponse)) {
                       if ($key =~ /^(\d+):/) {
                           push (@{$previous{'versionci'}},$1);
                           $previous{'awardci'} = $Apache::lonhomework::history{"resource.$partid.$id.awarddetail"};
                           $previous{'usedci'} = 1;
                       }
                   }
               }
  }   }
     }      }
     &Apache::lonhomework::showhash(%previous);      &Apache::lonhomework::showhash(%previous);
Line 217  sub handle_previous { Line 325  sub handle_previous {
     if ($$previous{'used'} && ($$previous{'award'} eq $ad) ) {      if ($$previous{'used'} && ($$previous{'award'} eq $ad) ) {
  if ($$previous{'last'}) {   if ($$previous{'last'}) {
     push(@Apache::inputtags::previous,'PREVIOUSLY_LAST');      push(@Apache::inputtags::previous,'PREVIOUSLY_LAST');
  } else {      push(@Apache::inputtags::previous_version,$$previous{'version'});
    } elsif (($Apache::lonhomework::type ne 'survey') &&
                    ($Apache::lonhomework::type ne 'surveycred') &&
                    ($Apache::lonhomework::type ne 'anonsurvey') &&
                    ($Apache::lonhomework::type ne 'anonsurveycred')) { 
     push(@Apache::inputtags::previous,'PREVIOUSLY_USED');      push(@Apache::inputtags::previous,'PREVIOUSLY_USED');
       push(@Apache::inputtags::previous_version,$$previous{'version'});
  }   }
  push(@Apache::inputtags::previous_version,$$previous{'version'});  
     }      }
 }  }
   
 sub view_or_modify {  sub view_or_modify {
     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();      my ($symb,$courseid,$domain,$name) = &Apache::lonnet::whichuser();
     my $myself=0;      my $myself=0;
     if ( ($name eq $ENV{'user.name'}) && ($domain eq $ENV{'user.domain'}) ) {      if ( ($name eq $env{'user.name'}) && ($domain eq $env{'user.domain'}) ) {
  $myself=1;   $myself=1;
     }      }
     my $vgr=&Apache::lonnet::allowed('vgr',$courseid);      my $vgr=&Apache::lonnet::allowed('vgr',$courseid);
Line 258  sub end_dataresponse { Line 370  sub end_dataresponse {
     my $result;      my $result;
     if ( $target eq 'web' ) {      if ( $target eq 'web' ) {
     } elsif ($target eq 'grade' ) {      } elsif ($target eq 'grade' ) {
  if ( defined $ENV{'form.submitted'}) {   if ( defined $env{'form.submitted'}) {
     my ($symb,$courseid,$domain,$name)=&Apache::lonxml::whichuser();      my ($symb,$courseid,$domain,$name)=&Apache::lonnet::whichuser();
     my $allowed=&Apache::lonnet::allowed('mgr',$courseid);      my $allowed=&Apache::lonnet::allowed('mgr',$courseid);
     if ($allowed) {      if ($allowed) {
  &Apache::response::setup_params('dataresponse');   &Apache::response::setup_params('dataresponse',$safeeval);
  my $partid = $Apache::inputtags::part;   my $partid = $Apache::inputtags::part;
  my $id = $Apache::inputtags::response['-1'];   my $id = $Apache::inputtags::response['-1'];
  my $response = $ENV{'form.HWVAL_'.$id};   my $response = $env{'form.HWVAL_'.$id};
  my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);   my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
  if ( $response =~ /[^\s]/) {   if ( $response =~ /[^\s]/) {
     $Apache::lonhomework::results{"resource.$partid.$id.$name"}=$response;      $Apache::lonhomework::results{"resource.$partid.$id.$name"}=$response;
Line 281  sub end_dataresponse { Line 393  sub end_dataresponse {
     return $result;      return $result;
 }  }
   
   sub start_customresponse {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $id = &Apache::response::start_response($parstack,$safeeval);
       push(@Apache::lonxml::namespace,'customresponse');
       my $result;
       @Apache::response::custom_answer=();
       @Apache::response::custom_answer_type=();
       &Apache::lonxml::register('Apache::response',('answer'));
       if ($target eq 'web') {
     if (  &Apache::response::show_answer() ) {
       my $answer = &Apache::lonxml::get_param('answerdisplay',$parstack,
      $safeeval);
       $Apache::inputtags::answertxt{$id}=[$answer];
    }
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token);
    $result.=&Apache::edit::text_arg('String to display for answer:',
    'answerdisplay',$token,'50');
    $result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag;
    $constructtag=&Apache::edit::get_new_args($token,$parstack,
     $safeeval,'answerdisplay');
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
    }
       } elsif ($target eq 'answer' || $target eq 'grade') {
    &Apache::response::reset_params();
       } elsif ($target eq 'meta') {
    $result .= &Apache::response::meta_package_write('customresponse');
       }
       return $result;
   }
   
   sub end_customresponse {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $result;
       my $part=$Apache::inputtags::part;
       my $id=$Apache::inputtags::response[-1];
       if ( $target eq 'grade' && &Apache::response::submitted() ) {
    my $response = &Apache::response::getresponse();
    if ($Apache::lonhomework::type eq 'exam' ||
       &Apache::response::submitted('scantron')) {
       &Apache::response::scored_response($part,$id);
    } elsif ( $response =~ /[^\s]/ && 
     $Apache::response::custom_answer_type[-1] eq 'loncapa/perl') {
       if (!$Apache::lonxml::default_homework_loaded) {
    &Apache::lonxml::default_homework_load($safeeval);
       }
       my %previous = &Apache::response::check_for_previous($response,
    $part,$id);
       $Apache::lonhomework::results{"resource.$part.$id.submission"}=
    $response;
       my $error;
       ${$safeeval->varglob('LONCAPA::customresponse_submission')}=
    $response;
       
       my ($award,$score) = &Apache::run::run('{ my $submission=$LONCAPA::customresponse_submission;'.$Apache::response::custom_answer[-1].'}',$safeeval);
       if (!&Apache::inputtags::valid_award($award)) {
    $error = $award;
    $award = 'ERROR';
       }
       &Apache::response::handle_previous(\%previous,$award);
       $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=
    $award;
               if ($award eq 'ASSIGNED_SCORE') {
                   $Apache::lonhomework::results{"resource.$part.$id.awarded"}=1.0*$score;
               }
       if ($error) {
    $Apache::lonhomework::results{"resource.$part.$id.awardmsg"}=
       $error;
       }
    }
       } elsif ( $target eq 'answer') {
    $result  = &Apache::response::answer_header('customresponse');
    my $answer = &Apache::lonxml::get_param('answerdisplay',$parstack,
    $safeeval);
    if ($env{'form.answer_output_mode'} ne 'tex') {
       $answer = '<b>'.$answer.'</b>';
    }
    $result .= &Apache::response::answer_part('customresponse',$answer);
    $result .= &Apache::response::answer_footer('customresponse');
       }
       if ($target eq 'web') {
    &setup_prior_tries_hash(\&format_prior_response_math);
       }
       if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || 
    $target eq 'tex' || $target eq 'analyze') {
    &Apache::lonxml::increment_counter(&Apache::response::repetition(),
      "$part.$id");
    if ($target eq 'analyze') {
               $Apache::lonhomework::analyze{"$part.$id.type"} = 'customresponse';
       &Apache::lonhomework::set_bubble_lines();
    }
       }
       pop(@Apache::lonxml::namespace);
       pop(@Apache::response::custom_answer);
       pop(@Apache::response::custom_answer_type);
       &Apache::lonxml::deregister('Apache::response',('answer'));
       &Apache::response::end_response();
       return $result;
   }
   
   sub format_prior_response_custom {
       my ($mode,$answer) =@_;
       return '<span class="LC_prior_custom">'.
       &HTML::Entities::encode($answer,'"<>&').'</span>';
   }
   
   sub start_mathresponse {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $id = &Apache::response::start_response($parstack,$safeeval);
       push(@Apache::lonxml::namespace,'mathresponse');
       my $result;
       @Apache::response::custom_answer=();
       @Apache::response::custom_answer_type=();
       &Apache::lonxml::register('Apache::response',('answer'));
       if ($target eq 'web') {
     if (  &Apache::response::show_answer() ) {
       my $answer = &Apache::lonxml::get_param('answerdisplay',$parstack,
      $safeeval);
       $Apache::inputtags::answertxt{$id}=[$answer];
    }
   
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token);
    $result.=&Apache::edit::text_arg('String to display for answer:',
    'answerdisplay',$token,'50');
    $result.=&Apache::edit::select_arg('Algebra System:',
      'cas',
      ['maxima','R'],
      $token);
    $result.=&Apache::edit::text_arg('Argument Array:',
    'args',$token).
                    &Apache::loncommon::help_open_topic('Maxima_Argument_Array');
           $result.=&Apache::edit::text_arg('Libraries:',
                                            'libraries',$token).
                    &Apache::loncommon::help_open_topic('Maxima_Libraries');
    $result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag;
    $constructtag=&Apache::edit::get_new_args($token,$parstack,
     $safeeval,'answerdisplay','cas','args','libraries');
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
    }
       } elsif ($target eq 'answer' || $target eq 'grade') {
    &Apache::response::reset_params();
       } elsif ($target eq 'meta') {
    $result .= &Apache::response::meta_package_write('mathresponse');
       }
       return $result;
   }
   
   sub edit_mathresponse_button {
       my ($id,$field)=@_;
       my $button=&mt('Edit Answer');
   #    my $helplink=&Apache::loncommon::help_open_topic('Formula_Editor');
       my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
       return(<<ENDFORMULABUTTON);
   <script type="text/javascript" language="JavaScript">
   function edit_${id}_${field} (textarea) {
       thenumber = textarea;
       thedata = document.forms['lonhomework'].elements[textarea].value;
       newwin = window.open("/adm/dragmath/applet/MaximaPopup.html","","width=565,height=400,resizable");
   }
   </script>
   <a href="javascript:edit_${id}_${field}('${field}');void(0);"><img class="stift" src="$iconpath/stift.gif" alt="$button" title="$button" /></a>
   ENDFORMULABUTTON
   }
   
   sub end_mathresponse {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $result;
       my $part=$Apache::inputtags::part;
       my $id=$Apache::inputtags::response[-1];
       if ( $target eq 'grade' && &Apache::response::submitted() ) {
    my $response = &Apache::response::getresponse();
    if ( $response =~ /[^\s]/ ) {
       if (!$Apache::lonxml::default_homework_loaded) {
    &Apache::lonxml::default_homework_load($safeeval);
       }
       my %previous = &Apache::response::check_for_previous($response,
    $part,$id);
       $Apache::lonhomework::results{"resource.$part.$id.submission"}=
    $response;
       my $error;
       my $award;
       my $cas = &Apache::lonxml::get_param('cas',$parstack,$safeeval);
               if ($cas eq 'maxima') {
                   my $args = [&Apache::lonxml::get_param_var('args',$parstack,$safeeval)];
                   $award=&Apache::lonmaxima::maxima_run($Apache::response::custom_answer[-1],$response,$args,
                                                         &Apache::lonxml::get_param('libraries',$parstack,$safeeval));
               }
               if ($cas eq 'R') {
                   my $args = [&Apache::lonxml::get_param_var('args',$parstack,$safeeval)];
                   $award=&Apache::lonr::r_run($Apache::response::custom_answer[-1],$response,$args,
                                               &Apache::lonxml::get_param('libraries',$parstack,$safeeval));
               }
   
       if (!&Apache::inputtags::valid_award($award)) {
    $error = $award;
    $award = 'ERROR';
       }
       &Apache::response::handle_previous(\%previous,$award);
       $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=
    $award;
       if ($error) {
    $Apache::lonhomework::results{"resource.$part.$id.awardmsg"}=
       $error;
       }
    }
       }
       if ($target eq 'web') {
    &setup_prior_tries_hash(\&format_prior_response_math);
           my $partid = $Apache::inputtags::part;
           my $id = $Apache::inputtags::response[-1];
           if (($Apache::inputtags::status['-1'] eq 'CAN_ANSWER')
              && (&Apache::lonnet::EXT('resource.'.$partid.'_'.$id.'.turnoffeditor') ne 'yes')) {
               $result.=&edit_mathresponse_button($id,"HWVAL_$id");
           }
       }
   
       pop(@Apache::lonxml::namespace);
       pop(@Apache::response::custom_answer);
       pop(@Apache::response::custom_answer_type);
       &Apache::lonxml::deregister('Apache::response',('answer'));
       &Apache::response::end_response();
       return $result;
   }
   
   sub format_prior_response_math {
       my ($mode,$answer) =@_;
       return '<span class="LC_prior_math">'.
       &HTML::Entities::encode($answer,'"<>&').'</span>';
   }
   
   sub implicit_multiplication {
       my ($expression)=@_;
   # Escape scientific notation, so 3e8 does not become 3*e*8
   # 3e8 -> 3&8; 3e-8 -> 3&-8; 3E+8 -> e&+8
       $expression=~s/(\d+)e([\+\-]*\d+)/$1\&\($2\)/gsi;
   # 3x10^8 -> 3&8; 3*10^-8 -> 3&-8
       $expression=~s/(\d+)(?:x|\*)10(?:\^|\*\*)([\+\-]*\d+)/$1\&\($2\)/gsi;
   # Fill in multiplication signs
   # a b -> a*b;3 b -> 3*b;3 4 -> 3*4
       $expression=~s/([A-Za-z0-9])\s+(?=[A-Za-z0-9])/$1\*/gs;
   # )( -> )*(; ) ( -> )*(
       $expression=~s/\)\s*\(/\)\*\(/gs;
   # 3a -> 3*a; 3( -> 3*(; 3 ( -> 3*(; 3A -> 3*A
       $expression=~s/(\d)\s*([a-zA-Z\(])/$1\*$2/gs;
   # a ( -> a*(
       $expression=~s/([A-Za-z0-9])\s+\(/$1\*\(/gs;
   # )a -> )*a; )3 -> )*3; ) 3 -> )*3
       $expression=~s/\)\s*([A-Za-z0-9])/\)\*$1/gs;
   # 3&8 -> 3e8; 3&-4 -> 3e-4
       $expression=~s/(\d+)\&\(([\+\-]*\d+)\)/$1e$2/gs;
       return $expression;
   }
   
   sub start_answer {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $result;
       push(@Apache::response::custom_answer,
    &Apache::lonxml::get_all_text_unbalanced("/answer",$parser));
       push(@Apache::response::custom_answer_type,
    lc(&Apache::lonxml::get_param('type',$parstack,$safeeval)));
       $Apache::response::custom_answer_type[-1] =~ s/\s+//g;
       if ($target eq "edit" ) {
    $result=&Apache::edit::tag_start($target,$token,'Answer algorithm');
    $result.=&Apache::edit::editfield($token->[1],
     $Apache::response::custom_answer[-1],
     '',80,4);
       } elsif ( $target eq "modified" ) {
    $result=$token->[4].&Apache::edit::modifiedfield('/answer',$parser);
       }
       return $result;
   }
   
   sub end_answer {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       if ($target eq 'edit' ) {
    return &Apache::edit::end_table();
       }
   }
   
 sub decide_package {  sub decide_package {
     my ($tagstack)=@_;      my ($tagstack)=@_;
     my $package;      my $package;
Line 318  sub start_responseparam { Line 716  sub start_responseparam {
     }      }
  }   }
  if (defined($optionlist)) {   if (defined($optionlist)) {
     $result.='Use template: <select name="'.      $result.=&mt('Use template:').' <select name="'.
  &Apache::edit::html_element_name('parameter_package').'">'.   &Apache::edit::html_element_name('parameter_package').'">'.
     '<option value=""></option>'.$optionlist.'</select><br />';      '<option value=""></option>'.$optionlist.'</select><br />';
  }   }
Line 333  sub start_responseparam { Line 731  sub start_responseparam {
      $safeeval,'name','type',       $safeeval,'name','type',
      'description','default');       'description','default');
  my $element=&Apache::edit::html_element_name('parameter_package');   my $element=&Apache::edit::html_element_name('parameter_package');
  if (defined($ENV{"form.$element"}) && $ENV{"form.$element"} ne '') {   if (defined($env{"form.$element"}) && $env{"form.$element"} ne '') {
     my $name=$ENV{"form.$element"};      my $name=$env{"form.$element"};
     my $tag=&decide_package($tagstack);      my $tag=&decide_package($tagstack);
     $token->[2]->{'name'}=$name;      $token->[2]->{'name'}=$name;
     $token->[2]->{'type'}=      $token->[2]->{'type'}=
Line 343  sub start_responseparam { Line 741  sub start_responseparam {
  $Apache::lonnet::packagetab{"$tag&$name&display"};   $Apache::lonnet::packagetab{"$tag&$name&display"};
     $token->[2]->{'default'}=      $token->[2]->{'default'}=
  $Apache::lonnet::packagetab{"$tag&$name&default"};   $Apache::lonnet::packagetab{"$tag&$name&default"};
               $token->[3] = ['name','type','description','default'];
     $constructtag=1;      $constructtag=1;
  }   }
  if ($constructtag) {   if ($constructtag) {
     $result = &Apache::edit::rebuild_tag($token);      $result = &Apache::edit::rebuild_tag($token);
     $result.=&Apache::edit::handle_insert();  
  }   }
     } elsif ($target eq 'grade' || $target eq 'answer' || $target eq 'web' ||      } elsif ($target eq 'grade' || $target eq 'answer' || $target eq 'web' ||
      $target eq 'tex' || $target eq 'analyze' ) {       $target eq 'tex' || $target eq 'analyze' ) {
  if ($ENV{'request.state'} eq 'construct') {   if ($env{'request.state'} eq 'construct') {
     my $name   =&Apache::lonxml::get_param('name',$parstack,$safeeval);      my $name   =&Apache::lonxml::get_param('name',$parstack,$safeeval);
     my $default=&Apache::lonxml::get_param('default',$parstack,      my $default=&Apache::lonxml::get_param('default',$parstack,
      $safeeval);       $safeeval);
Line 368  sub end_responseparam { Line 766  sub end_responseparam {
 }  }
   
 sub start_parameter {  sub start_parameter {
     my $result = &start_responseparam(@_);      return &start_responseparam(@_);
     return $result;  
 }  }
   
 sub end_parameter {  sub end_parameter {
     my $result = &end_responseparam(@_);      return &end_responseparam(@_);
     return $result;  
 }  }
   
 sub reset_params {  sub reset_params {
Line 382  sub reset_params { Line 778  sub reset_params {
 }  }
   
 sub setup_params {  sub setup_params {
     my ($tag) = @_;      my ($tag,$safeeval) = @_;
   
     if ($ENV{'request.state'} eq 'construct') { return; }      if ($env{'request.state'} eq 'construct') { return; }
     my %paramlist=();      my %paramlist=();
     foreach my $key (keys(%Apache::lonnet::packagetab)) {      foreach my $key (keys(%Apache::lonnet::packagetab)) {
  if ($key =~ /^$tag/) {   if ($key =~ /^\Q$tag\E/) {
     my ($package,$name) = split(/&/,$key);      my ($package,$name) = split(/&/,$key);
     $paramlist{$name}=1;      $paramlist{$name}=1;
  }   }
Line 405  sub setup_params { Line 801  sub setup_params {
     &Apache::lonxml::debug("using nothing");      &Apache::lonxml::debug("using nothing");
     $Apache::inputtags::params{$key}='';      $Apache::inputtags::params{$key}='';
  } else {   } else {
     &Apache::lonxml::debug("using value");      my $string="{return qq\0".$value."\0}";
       my $newvalue=&Apache::run::run($string,$safeeval,1);
       if (defined($newvalue)) { $value=$newvalue; }
     $Apache::inputtags::params{$key}=$value;      $Apache::inputtags::params{$key}=$value;
  }   }
     }      }
 }  }
   
   {
       my @answer_bits;
       my $need_row_start;
   
 sub answer_header {  sub answer_header {
       my ($type,$increment,$rows) = @_;
       my $result;
       if ($env{'form.answer_output_mode'} eq 'tex') {
    undef(@answer_bits);
    my $bit;
    if ($Apache::lonhomework::type eq 'exam') {
       $bit = ($Apache::lonxml::counter+$increment).') ';
    } else {
       $bit .= ' Answer for Part: \verb|'.
    $Apache::inputtags::part.'| ';
    }
    push(@answer_bits,$bit);
       } else {
    my $td = '<td '.(defined($rows)?'rowspan="'.$rows.'"':'').'>';
    $result  = '<table border="1"><tr>';
    if ($Apache::lonhomework::type eq 'exam') {
       $result .= $td.($Apache::lonxml::counter+$increment). ')</td>';
    } else {
       $result .= $td.&mt('Answer for Part: [_1]',
          $Apache::inputtags::part).'</td>';
    }
    $result .= "\n";
    $need_row_start = 0;
       }
       return $result;
   }
   
   sub next_answer {
     my ($type) = @_;      my ($type) = @_;
     my $result;      my $result;
     if ($ENV{'form.answer_output_mode'} eq 'tex') {      if ($env{'form.answer_output_mode'} eq 'tex') {
  $result = ' \vskip 0 mm \begin{tabular}{|c|}\hline Answer for Part: \verb|'.   # FIXME ... need to do something with tex mode
                   $Apache::inputtags::part.'| \\\\ \hline ';  
     } else {      } else {
  $result = '<table border="1"><tr><td>Answer for Part:'.   $result .= "</tr>";
     $Apache::inputtags::part. '</td>'."\n";   $need_row_start = 1;
     }      }
     return $result;      return $result;
 }  }
   
 sub answer_part {  sub answer_part {
     my ($type,$answer) = @_;      my ($type,$answer,$args) = @_;
     my $result;      my $result;
     if ($ENV{'form.answer_output_mode'} eq 'tex') {      if ($env{'form.answer_output_mode'} eq 'tex') {
  $result = ' \verb|'.$answer.'|\\\\ \hline ';   if (!$args->{'no_verbatim'}) {
       my $to_use='|';
       foreach my $value (32..126) {
    my $char=pack('c',$value);
    if ($answer !~ /\Q$char\E/) {
       $to_use=$char;
       last;
    }
       }
               my $fullanswer=$answer;
               $answer='';
               foreach my $element (split(/[\;]/,$fullanswer)) {
          if ($element ne '') {
     $answer.= '\verb'.$to_use.$element.$to_use.' \newline';
          }
               }
    }
    if ($answer ne '') {
       push(@answer_bits,$answer);
    }
     } else {      } else {
  $result = '<td>'.$answer.'</td>';   if ($need_row_start) {
       $result .= '<tr>';
       $need_row_start = 0;
    }
    $result .= '<td>'.$answer.'</td>';
     }      }
     return $result;      return $result;
 }  }
Line 438  sub answer_part { Line 890  sub answer_part {
 sub answer_footer {  sub answer_footer {
     my ($type) = @_;      my ($type) = @_;
     my $result;      my $result;
     if ($ENV{'form.answer_output_mode'} eq 'tex') {      if ($env{'form.answer_output_mode'} eq 'tex') {
  $result = ' \end{tabular} \vskip 0 mm ';   $result  = ' \vskip 0 mm \noindent \begin{tabular}{|p{1.5cm}|p{6.8cm}|}\hline ';
    $result .= $answer_bits[0].'&\vspace*{-4mm}\begin{itemize}';
           for (my $i=1;$i<=$#answer_bits;$i++) {
               $result.='\item '.$answer_bits[$i].'\vspace*{-7mm}';
           }
    $result .= ' \end{itemize} \\\\ \hline \end{tabular} \vskip 0 mm ';
     } else {      } else {
  $result = '</tr></table>';   if (!$need_row_start) {
       $result .= '</tr>';
    }
    $result .= '</table>';
     }      }
     return $result;      return $result;
 }  }
   
   }
   
 sub showallfoils {  sub showallfoils {
     my $return=0;      if (defined($env{'form.showallfoils'})) {
     if (defined($ENV{'form.showallfoils'}) &&   my ($symb)=&Apache::lonnet::whichuser();
  $ENV{'request.state'} eq 'construct') {   if (($env{'request.state'} eq 'construct') || 
  $return=1;      ($env{'user.adv'} && $symb eq '')      ||
               ($Apache::lonhomework::viewgrades) ) {
       return 1;
    }
     }      }
     return $return;      if ($Apache::lonhomework::type eq 'survey') { return 1; }
       if ($Apache::lonhomework::type eq 'surveycred') { return 1; }
       if ($Apache::lonhomework::type eq 'anonsurvey') { return 1; }
       if ($Apache::lonhomework::type eq 'anonsurveycred') { return 1; }
   
       return 0;
 }  }
   
   =pod
   
   =item &getresponse();
   
   Retreives the current submitted response, helps out in the case of
   scantron mode.
   
   Returns either the exact text of the submission, or a bubbled response
   converted to something usable.
   
   Optional Arguments:
     $offset - (defaults to 1) if a problem has more than one bubble
               response, pass in the number of the bubble wanted, (the
               first bubble associated with a problem has an offset of 1,
               the second bubble is 2
   
     $resulttype - undef    -> a number between 0 and 25
                   'A is 1' -> a number between 1 and 26
                   'letter' -> a letter between 'A' and 'Z'
     $lines  - undef problem only needs a single line of bubbles.
               nonzero  Problem wants the first nonempty response in 
                         $lines lines of bubbles.
     $bubbles_per_line - Must be provided if lines is defined.. number of
                         bubbles on a line.
   
   =cut
   
 sub getresponse {  sub getresponse {
     my ($temp,$resulttype)=@_;      my ($offset,$resulttype, $lines, $bubbles_per_line)=@_;
     my $formparm='form.HWVAL_'.$Apache::inputtags::response['-1'];      my $formparm='form.HWVAL_'.$Apache::inputtags::response['-1'];
     my $response;      my $response;
     if (!defined($temp)) {      if (!defined($offset)) {
  $temp=1;   $offset=1;
     } else {      } else {
  $formparm.=":$temp";   $formparm.=":$offset";
       }
       if (!defined($lines)) {
    $lines = 1;
     }      }
     my %let_to_num=('A'=>0,'B'=>1,'C'=>2,'D'=>3,'E'=>4,'F'=>5,'G'=>6,'H'=>7,      my %let_to_num=('A'=>0,'B'=>1,'C'=>2,'D'=>3,'E'=>4,'F'=>5,'G'=>6,'H'=>7,
     'I'=>8,'J'=>9,'K'=>10,'L'=>11,'M'=>12,'N'=>13,'O'=>14,      'I'=>8,'J'=>9,'K'=>10,'L'=>11,'M'=>12,'N'=>13,'O'=>14,
     'P'=>15,'Q'=>16,'R'=>17,'S'=>18,'T'=>19,'U'=>20,'V'=>21,      'P'=>15,'Q'=>16,'R'=>17,'S'=>18,'T'=>19,'U'=>20,'V'=>21,
     'W'=>22,'X'=>23,'Y'=>24,'Z'=>25);      'W'=>22,'X'=>23,'Y'=>24,'Z'=>25);
     if ($ENV{'form.submitted'} eq 'scantron') {      if ($env{'form.submitted'} eq 'scantron') {
  my $part  = $Apache::inputtags::part;   my $part  = $Apache::inputtags::part;
  my $id    = $Apache::inputtags::response[-1];   my $id    = $Apache::inputtags::response[-1];
  $response = $ENV{'scantron.'.($Apache::lonxml::counter+$temp-1).  
  '.answer'};   my $line;
    my $startline = $env{'form.scantron_questnum_start.'.$part.'.'.$id};
           if (!$startline) {
               $startline = $Apache::lonxml::counter;
           }
    for ($line = 0; $line < $lines; $line++) {
               my $theline = $startline+$offset-1+$line;
       $response = $env{"scantron.$theline.answer"};
       if ((defined($response)) && ($response ne "") && ($response ne " ")) {
    last;
       }
    
    }
   
  # save bubbled letter for later   # save bubbled letter for later
  $Apache::lonhomework::results{"resource.$part.$id.scantron"}.=   $Apache::lonhomework::results{"resource.$part.$id.scantron"}.=
     $response;      $response;
  if ($resulttype ne 'letter') {   if ($resulttype ne 'letter') {
     $response = $let_to_num{$response};      if ($resulttype eq 'A is 1') {
    $response = $let_to_num{$response}+1;
       } else {
    $response = $let_to_num{$response};
       }
       if ($response ne "") {
    $response += $line * $bubbles_per_line;
       }
    } else {
       if ($response ne "") {
    $response = chr(ord($response) + $line * $bubbles_per_line);
       }
  }   }
   
     } else {      } else {
  $response = $ENV{$formparm};   $response = $env{$formparm};
     }      }
       # 
       #  If we have a nonempty answer, correct the numeric value
       #  of the answer for the line on which it was found.
       #
   
     return $response;      return $response;
 }  }
   
   =pod
   
   =item &repetition();
   
   Returns the number of lines that are required to encode the weight.
   (Currently expects that there are 10 bubbles per line)
   
   =cut
   
 sub repetition {  sub repetition {
     my $id = $Apache::inputtags::part;      my $id = $Apache::inputtags::part;
     my $weight = &Apache::lonnet::EXT("resource.$id.weight");      my $weight = &Apache::lonnet::EXT("resource.$id.weight");
     my $repetition = int $weight/9;      if (!defined($weight) || ($weight eq '')) { $weight=1; }
     if ($weight % 9 != 0) {$repetition++;}       my $repetition = int($weight/10);
       if ($weight % 10 != 0) { $repetition++; } 
     return $repetition;      return $repetition;
 }  }
   
   =pod
   
   =item &scored_response();
   
   Sets the results hash elements
   
      resource.$part_id.$response_id.awarded - to the floating point
        number between 0 and 1 that was awarded on the bubbled input
   
      resource.$part_id.$response_id.awarddetail - to 'ASSIGNED_SCORE'
   
   Returns
   
      the number of bubble sheet lines that were used (and likely need to
        be passed to &Apache::lonxml::increment_counter()
   
   Arguments
   
      $part_id - id of the part to grade
      $response_id - id of the response to grade
     
   
   =cut
   
 sub scored_response {  sub scored_response {
     my ($part,$id)=@_;      my ($part,$id)=@_;
     my $repetition=&repetition();      my $repetition=&repetition();
     my $score=0;      my $score=0;
     for (my $i=0;$i<$repetition;$i++) {      for (my $i=0;$i<$repetition;$i++) {
    # A is 1, B is 2, etc. (get response return 0-9 and then we add 1)
  my $increase=&Apache::response::getresponse($i+1);   my $increase=&Apache::response::getresponse($i+1);
  if ($increase ne '') { $score+=$increase+1; }   if ($increase ne '') { $score+=$increase+1; }
     }      }
     my $weight = &Apache::lonnet::EXT("resource.$part.weight");      my $weight = &Apache::lonnet::EXT("resource.$part.weight");
       if (!defined($weight) || $weight eq '' || $weight eq 0) { $weight = 1; }
     my $pcr=$score/$weight;      my $pcr=$score/$weight;
     $Apache::lonhomework::results{"resource.$part.$id.awarded"}=$pcr;      $Apache::lonhomework::results{"resource.$part.$id.awarded"}=$pcr;
     $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=      $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=
Line 565  sub show_answer { Line 1131  sub show_answer {
     my $award  = $Apache::lonhomework::history{"resource.$part.solved"};      my $award  = $Apache::lonhomework::history{"resource.$part.solved"};
     my $status = $Apache::inputtags::status[-1];      my $status = $Apache::inputtags::status[-1];
     return  ( ($award =~ /^correct/      return  ( ($award =~ /^correct/
        && lc($Apache::lonhomework::problemstatus) ne 'no')         && &Apache::lonhomework::show_problem_status())
       || $status eq "SHOW_ANSWER");        || $status eq "SHOW_ANSWER");
 }  }
   
Line 583  sub analyze_store_foilgroup { Line 1149  sub analyze_store_foilgroup {
     push (@{ $Apache::lonhomework::analyze{"$part_id.shown"} }, @{ $shown });      push (@{ $Apache::lonhomework::analyze{"$part_id.shown"} }, @{ $shown });
 }  }
   
   sub check_if_computed {
       my ($token,$parstack,$safeeval,$name)=@_;
       my $value = &Apache::lonxml::get_param($name,$parstack,$safeeval);
       if (ref($token->[2]) eq 'HASH' && $value ne $token->[2]{$name}) {
    my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
    $Apache::lonhomework::analyze{"$part_id.answercomputed"} = 1;
       }
   }
   
 sub pick_foil_for_concept {  sub pick_foil_for_concept {
     my ($target,$attrs,$hinthash,$parstack,$safeeval)=@_;      my ($target,$attrs,$hinthash,$parstack,$safeeval)=@_;
     if (not defined(@{ $Apache::response::conceptgroup{'names'} })) { return; }      if (not defined(@{ $Apache::response::conceptgroup{'names'} })) { return; }
Line 618  sub pick_foil_for_concept { Line 1193  sub pick_foil_for_concept {
   
 }  }
   
   =pod
   
   =item get_response_param()
   
   Get a parameter associated with a problem.
   Parameters:
    $id        - the id of the paramater, either a part id, 
                 or a partid and responspe id joined by _
    $name      - Name of the parameter to fetch
    $default   - Default value for the paramter.
   
   =cut
   
   sub get_response_param {
       my ($id,$name,$default)=@_;
       my $parameter;
       if ($env{'request.state'} eq 'construct' &&
    defined($Apache::inputtags::params{$name})) {
    $parameter=$Apache::inputtags::params{$name};
       } else {
    $parameter=&Apache::lonnet::EXT("resource.$id.$name");
       }
       if (!defined($parameter) || $parameter eq '') {
    $parameter = $default;
       }
       return $parameter;
   }
   
   sub submitted {
       my ($who)=@_;
       
       # when scatron grading any submission is a submission
       if ($env{'form.submitted'} eq 'scantron') { return 1; }
       # if the caller only cared if this was a scantron submission
       if ($who eq 'scantron') { return 0; }
       # if the Submit Answer button for this particular part was pressed
       my $partid=$Apache::inputtags::part;
       if ($env{'form.submitted'} eq "part_$partid") {
    return 1;
       }
       if ($env{'form.submitted'} eq "yes"
    && defined($env{'form.submit_'.$partid})) {
    return 1;
       }
       # Submit All button on a .page was pressed
       if (defined($env{'form.all_submit'})) { return 1; }
       # otherwise no submission occurred
       return 0;
   }
   
   sub add_to_gradingqueue {
       my ($symb,$courseid,$domain,$name) = &Apache::lonnet::whichuser();
       if (   $courseid eq ''
    || $symb eq ''
    || $env{'request.state'} eq 'construct'
    || $Apache::lonhomework::type ne 'problem') {
    return;
       }
   
       my %queue_info = ( 'type' => 'problem',
          'time' => time);
   
       if (exists($Apache::lonhomework::history{"resource.0.checkedin.slot"})) {
    $queue_info{'slot'}=
        $Apache::lonhomework::history{"resource.0.checkedin.slot"};
       }
   
       my $result=&Apache::bridgetask::add_to_queue('gradingqueue',\%queue_info);
       if ($result ne 'ok') {
    &Apache::lonxml::error("add_to_queue said $result");
       }
   }
   
   =pod 
   
   =item check_status()
   
   basically undef and 0 (both false) mean that they still have work to do
   and all true values mean that they can't do any more work
   
    a return of undef means it is unattempted
    a return of 0 means it is attmpted and wrong but still has tries
    a return of 1 means it is marked correct
    a return of 2 means they have exceed maximum number of tries
    a return of 3 means it after the answer date
   
   =cut
   
   sub check_status {
       my ($id)=@_;
       if (!defined($id)) { $id=$Apache::inputtags::part; }
       my $curtime=&Apache::lonnet::EXT('system.time');
       my $opendate=&Apache::lonnet::EXT("resource.$id.opendate");
       my $duedate=&Apache::lonnet::EXT("resource.$id.duedate");
       my $answerdate=&Apache::lonnet::EXT("resource.$id.answerdate");
       if ( $opendate && $curtime > $opendate &&
            $duedate && $curtime > $duedate &&
            $answerdate && $curtime > $answerdate) {
           return 3;
       }
       my $status=&Apache::lonnet::EXT("user.resource.resource.$id.solved");
       if ($status =~ /^correct/) { return 1; }
       if (!$status) { return undef; }
       my $maxtries=&Apache::lonnet::EXT("resource.$id.maxtries");
       if ($maxtries eq '') { $maxtries=2; }
       my $curtries=&Apache::lonnet::EXT("user.resource.resource.$id.tries");
       if ($curtries < $maxtries) { return 0; }
       return 2;
   }
   
   =pod
   
   =item setup_prior_tries_hash()
   
     Foreach each past .submission $func is called with 3 arguments
        - the mode to set things up for (currently always 'grade')
        - the stored .submission string
        - The expansion of $data
   
     $data is an array ref containing elements that are either
       - scalars that are other elements of the history hash to pass to $func
       - ref to data to be passed untouched to $func
   
   =cut
   
   sub setup_prior_tries_hash {
       my ($func,$data) = @_;
       my $part = $Apache::inputtags::part;
       my $id   = $Apache::inputtags::response[-1];
       foreach my $i (1..$Apache::lonhomework::history{'version'}) {
    my $sub_key   = "$i:resource.$part.$id.submission";
    next if (!exists($Apache::lonhomework::history{$sub_key}));
    my @other_data;
    foreach my $datum (@{ $data }) {
       if (ref($datum)) {
    push(@other_data,$datum);
       } else {
    my $info_key = "$i:resource.$part.$id.$datum";
    push(@other_data,$Apache::lonhomework::history{$info_key});
       }
    }
   
    my $output =
       &$func('grade',
      $Apache::lonhomework::history{$sub_key},
      \@other_data);
    if (defined($output)) {
       $Apache::inputtags::submission_display{$sub_key} = $output;
    }
       }
   }
   
 1;  1;
 __END__  __END__
     
   =pod
   
   =cut
Removed from v.1.90  
changed lines
  Added in v.1.220

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>