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Diff for /loncom/homework/response.pm between versions 1.54 and 1.169

version 1.54, 2001/12/07 23:59:08 version 1.169, 2007/05/31 09:43:46
Line 25 Line 25
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 # 11/23,11/24,11/28 Gerd Kortemeyer  
 # Guy Albertelli  
 # 08/04,08/07 Gerd Kortemeyer  
   
 package Apache::response;  package Apache::response;
 use strict;  use strict;
   use Apache::lonlocal;
   use Apache::lonnet;
   use Apache::lonmaxima();
   
 sub BEGIN {  BEGIN {
   &Apache::lonxml::register('Apache::response',('responseparam','caparesponse','numericalresponse','formularesponse','stringresponse','radiobuttonresponse','optionresponse','imageresponse','essayresponse','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;   &Apache::lonxml::debug("New  :$id:");
     &Apache::lonxml::debug("New  :$id:");      }
   }      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 '' && 
   return $id;   !$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;
 }  }
   
 sub end_response {  sub end_response {
   pop @Apache::inputtags::response;      #pop @Apache::inputtags::response;
   @Apache::inputtags::inputlist=();      @Apache::inputtags::inputlist=();
   return '';      return '';
 }  }
   
 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);
   return $id;      push (@Apache::inputtags::paramstack,[%Apache::inputtags::params]);
       return $id;
 }  }
   
 sub end_hintresponse {  sub end_hintresponse {
   pop @Apache::inputtags::response;      pop @Apache::inputtags::hint;
   return '';      if (defined($Apache::inputtags::paramstack[-1])) {
    %Apache::inputtags::params=
       @{ pop(@Apache::inputtags::paramstack) };
       }
       return '';
   }
   
   my @randomseeds;
   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.");
       }
 }  }
   
 # used by response to set the non-safe space random number generator to something  
 # that is stable and unique based on the part number and response number  
 sub setrandomnumber {  sub setrandomnumber {
   my $rndseed;      my ($ignore_id2) = @_;
   if ($ENV{'request.state'} eq "construct") {      my $rndseed;
     $rndseed=$ENV{'form.rndseed'};      $rndseed=&Apache::structuretags::setup_rndseed();
     if (!$rndseed) { $rndseed=time; }      if (!defined($rndseed)) { $rndseed=&Apache::lonnet::rndseed(); }
   } else {      &Apache::lonxml::debug("randseed $rndseed");
     $rndseed=&Apache::lonnet::rndseed();      #  $rndseed=unpack("%32i",$rndseed);
   }      my $rand_alg=&Apache::lonnet::get_rand_alg();
   &Apache::lonxml::debug("randseed $rndseed");      my ($rndmod,$rndmod2);
 #  $rndseed=unpack("%32i",$rndseed);  
   $rndseed=$rndseed      my ($id1,$id2,$shift_amt);
     +(&Apache::lonnet::numval($Apache::inputtags::part) << 10);      if ($Apache::lonhomework::parsing_a_problem) {
   if (defined($Apache::inputtags::response['-1'])) {   $id1=$Apache::inputtags::part;
     $rndseed=$rndseed   if (defined($Apache::inputtags::response[-1])) {
       +&Apache::lonnet::numval($Apache::inputtags::response['-1']);      $id2=$Apache::inputtags::response[-1];
   }   }
   srand($rndseed);   $shift_amt=scalar(@Apache::inputtags::responselist);
   &Apache::lonxml::debug("randseed $rndseed");      } elsif ($Apache::lonhomework::parsing_a_task) {
   return '';   $id1=&Apache::bridgetask::get_dim_id();
    if (!$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) << $shift );
    }
       } else {
    ($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;
    if($Apache::lonnet::_64bit) {
       use integer;
       $rndseed=(($rndseed<<32)>>32);
    }
       }
       &Apache::lonxml::debug("randseed $rndmod $rndseed");
       &Apache::lonnet::setup_random_from_rndseed($rndseed);
       return '';
 }  }
   
 sub meta_parameter_write {  sub meta_parameter_write {
Line 98  sub meta_parameter_write { Line 180  sub meta_parameter_write {
     my $partref=$Apache::inputtags::part;      my $partref=$Apache::inputtags::part;
     my $result='<parameter part="'.$Apache::inputtags::part.'"';      my $result='<parameter part="'.$Apache::inputtags::part.'"';
     if (defined($Apache::inputtags::response[-1])) {      if (defined($Apache::inputtags::response[-1])) {
       $result.=            ' id="'.$Apache::inputtags::response[-1].'"';   $result.=            ' id="'.$Apache::inputtags::response[-1].'"';
       $partref.='_'.$Apache::inputtags::response[-1];   $partref.='_'.$Apache::inputtags::response[-1];
     }      }
     $result.=            ' name="'.$name.'"'.      $result.=            ' name="'.$name.'"'.
                          ' type="'.$type.'"'.                           ' type="'.$type.'"'.
 ($default?' default="'.$default.'"':'').  (defined($default)?' default="'.$default.'"':'').
 ($display?' display="'.$display.' [Part: '.$partref.']"':'')  (defined($display)?' display="'.$display.' [Part: '.$partref.']"':'')
              .'></parameter>'               .'></parameter>'
              ."\n";               ."\n";
     return $result;      return $result;
Line 114  sub meta_package_write { Line 196  sub meta_package_write {
     my $name=shift;      my $name=shift;
     my $result = '<parameter part="'.$Apache::inputtags::part.'"';      my $result = '<parameter part="'.$Apache::inputtags::part.'"';
     if(defined($Apache::inputtags::response[-1])) {      if(defined($Apache::inputtags::response[-1])) {
       $result.=              ' id="'.$Apache::inputtags::response[-1].'"';   $result.= ' id="'.$Apache::inputtags::response[-1].'"';
     }      }
     $result.=' package="'.$name.'"></parameter>'."\n";      $result.=' package="'.$name.'"></parameter>'."\n";
     return $result;      return $result;
Line 125  sub meta_stores_write { Line 207  sub meta_stores_write {
     my $partref=$Apache::inputtags::part;      my $partref=$Apache::inputtags::part;
     my $result = '<stores part="'.$Apache::inputtags::part.'"';      my $result = '<stores part="'.$Apache::inputtags::part.'"';
     if (defined($Apache::inputtags::response[-1])) {      if (defined($Apache::inputtags::response[-1])) {
       $result.=           ' id="'.$Apache::inputtags::response[-1].'"';   $result.=           ' id="'.$Apache::inputtags::response[-1].'"';
       $partref.='_'.$Apache::inputtags::response[-1];   $partref.='_'.$Apache::inputtags::response[-1];
     }      }
     $result.=          ' name="'.$name.'"'.      $result.=          ' name="'.$name.'"'.
                        ' type="'.$type.'"'.                         ' type="'.$type.'"'.
Line 141  sub mandatory_part_meta { Line 223  sub mandatory_part_meta {
 # output (to lonspreadsheet)  # output (to lonspreadsheet)
 # of each part  # of each part
 #  #
  return      return
 #    &meta_parameter_write('opendate','date_start','',  #    &meta_parameter_write('opendate','date_start','',
 #                          'Opening Date').  #                          'Opening Date').
 #    &meta_parameter_write('duedate','date_end','',  #    &meta_parameter_write('duedate','date_end','',
Line 152  sub mandatory_part_meta { Line 234  sub mandatory_part_meta {
 #                          'Available Points').  #                          'Available Points').
 #    &meta_parameter_write('maxtries','int_pos','',  #    &meta_parameter_write('maxtries','int_pos','',
 #                          'Maximum Number of Tries').  #                          'Maximum Number of Tries').
     &meta_package_write('part').   &meta_package_write('part').
     &meta_stores_write('solved','string',          &meta_stores_write('solved','string',
                           'Problem Status').     'Problem Status').
     &meta_stores_write('tries','int_zeropos',          &meta_stores_write('tries','int_zeropos',
                           'Number of Attempts').     'Number of Attempts').
     &meta_stores_write('awarded','float',          &meta_stores_write('awarded','float',
           'Partial Credit Factor');     'Partial Credit Factor');
 #  #
 # Note: responseid-specific data 'submission' and 'awarddetail'  # Note: responseid-specific data 'submission' and 'awarddetail'
 # not available to spreadsheet -> skip here  # not available to spreadsheet -> skip here
 #  #
 }  }
   
   sub meta_part_order {
       if (@Apache::inputtags::partlist) {
    my @parts=@Apache::inputtags::partlist;
    shift(@parts);
    return '<partorder>'.join(',',@parts).'</partorder>'."\n";
       } else {
    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) = @_;
   my %previous;      my %previous;
   $previous{'used'} = 0;      $previous{'used'} = 0;
   foreach my $key (reverse(sort(keys(%Apache::lonhomework::history)))) {      foreach my $key (sort(keys(%Apache::lonhomework::history))) {
     if ($key =~ /resource\.$partid\.$id\.submission/) {   if ($key =~ /resource\.$partid\.$id\.submission$/) {
       &Apache::lonxml::debug("Trying $key");      if ( $last && $key =~ /^(\d+):/ ) {
       my $pastresponse=$Apache::lonhomework::history{$key};   next if ($1 >= $last);
       if ($pastresponse eq $curresponse) {      }
  $previous{'used'} = 1;      &Apache::lonxml::debug("Trying $key");
  my $history;      my $pastresponse=$Apache::lonhomework::history{$key};
  if ( $key =~ /^(\d+):/ ) {      if ($pastresponse eq $curresponse) {
   $history=$1;   $previous{'used'} = 1;
   $previous{'award'} = $Apache::lonhomework::history{"$history:resource.$partid.$id.awarddetail"};   my $history;
   $previous{'last'}='0';   if ( $key =~ /^(\d+):/ ) {
  } else {      $history=$1;
   $previous{'award'} = $Apache::lonhomework::history{"resource.$partid.$id.awarddetail"};      $previous{'award'} = $Apache::lonhomework::history{"$history:resource.$partid.$id.awarddetail"};
   $previous{'last'}='1';      $previous{'last'}='0';
       push(@{ $previous{'version'} },$history);
    } else {
       $previous{'award'} = $Apache::lonhomework::history{"resource.$partid.$id.awarddetail"};
       $previous{'last'}='1';
    }
    if (! $previous{'award'} ) { $previous{'award'} = 'UNKNOWN'; }
    &Apache::lonxml::debug("got a match :$previous{'award'}:$previous{'used'}:");
       }
  }   }
  if (! $previous{'award'} ) { $previous{'award'} = 'UNKNOWN'; }  
  &Apache::lonxml::debug("got a match :$previous{'award'}:$previous{'used'}:");  
  last;  
       }  
     }      }
   }      &Apache::lonhomework::showhash(%previous);
   return %previous;      return %previous;
 }  }
   
 sub handle_previous {  sub handle_previous {
   my ($previous,$ad)=@_;      my ($previous,$ad)=@_;
   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,$$previous{'version'});
       push(@Apache::inputtags::previous,'PREVIOUSLY_USED');   } elsif ($Apache::lonhomework::type ne 'survey') {
       push(@Apache::inputtags::previous,'PREVIOUSLY_USED');
       push(@Apache::inputtags::previous_version,$$previous{'version'});
    }
     }      }
   }  
 }  }
   
 sub start_caparesponse {  sub view_or_modify {
   require Apache::caparesponse;       my ($symb,$courseid,$domain,$name) = &Apache::lonnet::whichuser();
   import Apache::caparesponse;       my $myself=0;
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      if ( ($name eq $env{'user.name'}) && ($domain eq $env{'user.domain'}) ) {
 #  print "\n<br />\nsimple caparesponse\n";   $myself=1;
   return &Apache::caparesponse::start_caparesponse($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);      }
       my $vgr=&Apache::lonnet::allowed('vgr',$courseid);
       my $mgr=&Apache::lonnet::allowed('vgr',$courseid);
       if ($mgr) { return "M"; }
       if ($vgr) { return "V"; }
       if ($myself) { return "V"; }
       return '';
 }  }
   
 sub start_stringresponse {  sub start_dataresponse {
   require Apache::caparesponse;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   import Apache::caparesponse;      my $id = &Apache::response::start_response($parstack,$safeeval);
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my $result;
   return &Apache::caparesponse::start_stringresponse($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);      if ($target eq 'web') {
    $result = $token->[2]->{'display'}.':';
       } elsif ($target eq 'meta') {
    $result = &Apache::response::meta_stores_write($token->[2]->{'name'},
          $token->[2]->{'type'},
          $token->[2]->{'display'});
    $result .= &Apache::response::meta_package_write('dataresponse');
       }
       return $result;
 }  }
   
 sub start_formularesponse {  sub end_dataresponse {
   require Apache::caparesponse;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   import Apache::caparesponse;      my $result;
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      if ( $target eq 'web' ) {
   return &Apache::caparesponse::start_formularesponse($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);      } elsif ($target eq 'grade' ) {
    if ( defined $env{'form.submitted'}) {
       my ($symb,$courseid,$domain,$name)=&Apache::lonnet::whichuser();
       my $allowed=&Apache::lonnet::allowed('mgr',$courseid);
       if ($allowed) {
    &Apache::response::setup_params('dataresponse',$safeeval);
    my $partid = $Apache::inputtags::part;
    my $id = $Apache::inputtags::response['-1'];
    my $response = $env{'form.HWVAL_'.$id};
    my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
    if ( $response =~ /[^\s]/) {
       $Apache::lonhomework::results{"resource.$partid.$id.$name"}=$response;
       $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
       $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}='SUBMITTED';
    }
       } else {
    $result='Not Permitted to change values.'
       }
    }
       }
       &Apache::response::end_response;
       return $result;
 }  }
   
 sub start_numericalresponse {  sub start_customresponse {
   require Apache::caparesponse;       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   import Apache::caparesponse;       my $id = &Apache::response::start_response($parstack,$safeeval);
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      push(@Apache::lonxml::namespace,'customresponse');
   return &Apache::caparesponse::start_numericalresponse      my $result;
     ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);      @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);
    $result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($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 start_radiobuttonresponse {  sub end_customresponse {
   require Apache::radiobuttonresponse;       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   import Apache::radiobuttonresponse;       my $result;
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my $part=$Apache::inputtags::part;
   return &Apache::radiobuttonresponse::start_radiobuttonresponse($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);      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 = &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"}=
    $award;
       if ($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());
       }
       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 start_optionresponse {  sub format_prior_response_custom {
   require Apache::optionresponse;       my ($mode,$answer) =@_;
   import Apache::optionresponse;       return '<span class="LC_prior_custom">'.
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      &HTML::Entities::encode($answer,'"<>&').'</span>';
   return &Apache::optionresponse::start_optionresponse($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);  }
   
   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);
    $result.=&Apache::edit::select_arg('Algebra System:',
      'cas',
      ['maxima'],
      $token);
    $result.=&Apache::edit::text_arg('Argument Array:',
    'args',$token);
    $result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag;
    $constructtag=&Apache::edit::get_new_args($token,$parstack,
     $safeeval,'answerdisplay','cas','args');
    if ($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 start_imageresponse {  sub end_mathresponse {
   require Apache::imageresponse;       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   import Apache::imageresponse;       my $result;
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my $part=$Apache::inputtags::part;
   return &Apache::imageresponse::start_imageresponse($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);      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);
               }
       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);
       }
   
 sub start_essayresponse {      pop(@Apache::lonxml::namespace);
   require Apache::essayresponse;       pop(@Apache::response::custom_answer);
   import Apache::essayresponse;       pop(@Apache::response::custom_answer_type);
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      &Apache::lonxml::deregister('Apache::response',('answer'));
   return &Apache::essayresponse::start_essayresponse($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);      &Apache::response::end_response();
       return $result;
 }  }
   
 sub view_or_modify {  sub format_prior_response_math {
   my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();      my ($mode,$answer) =@_;
   my $myself=0;      return '<span class="LC_prior_math">'.
   if ( ($name eq $ENV{'user.name'}) && ($domain eq $ENV{'user.domain'}) ) {      &HTML::Entities::encode($answer,'"<>&').'</span>';
     $myself=1;  }
   }  
   my $vgr=&Apache::lonnet::allowed('vgr',$courseid);  sub implicit_multiplication {
   my $mgr=&Apache::lonnet::allowed('vgr',$courseid);      my ($expression)=@_;
   if ($mgr) { return "M"; }  # Escape scientific notation, so 3e8 does not become 3*e*8
   if ($vgr) { return "V"; }  # 3e8 -> 3&8; 3e-8 -> 3&-8; 3E+8 -> e&+8
   if ($myself) { return "V"; }      $expression=~s/(\d+)e([\+\-]*\d+)/$1\&\($2\)/gsi;
   return '';  # 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/(\w)\s+(\w)/$1\*$2/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/(\w)\s+\(/$1\*\(/gs;
   # )a -> )*a; )3 -> )*3; ) 3 -> )*3
       $expression=~s/\)\s*(\w)/\)\*$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 start_dataresponse {  sub end_answer {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $id = &Apache::response::start_response($parstack,$safeeval);      if ($target eq 'edit' ) {
   my $result;   return &Apache::edit::end_table();
   if ($target eq 'web') {      }
     $result = $token->[2]->{'display'}.':';  
   } elsif ($target eq 'meta') {  
     $result = &Apache::response::meta_stores_write($token->[2]->{'name'},  
    $token->[2]->{'type'},  
    $token->[2]->{'display'});  
     $result .= &Apache::response::meta_package_write('dataresponse');  
   }  
   return $result;  
 }  }
   
 sub end_dataresponse {  sub decide_package {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($tagstack)=@_;
   my $result;      my $package;
   if ( $target eq 'web' ) {      if ($$tagstack[-1] eq 'parameter') {
   } elsif ($target eq 'grade' ) {   $package='part';
     if ( defined $ENV{'form.submitted'}) {      } else {
       my ($symb,$courseid,$domain,$name)=&Apache::lonxml::whichuser();   my $i=-1;
       my $allowed=&Apache::lonnet::allowed('mgr',$courseid);   while (defined($$tagstack[$i])) {
       if ($allowed) {      if ($$tagstack[$i] =~ /(response|hint)$/) {
  &Apache::response::setup_params('datasubmission');   $package=$$tagstack[$i];
  my $partid = $Apache::inputtags::part;   last;
  my $id = $Apache::inputtags::response['-1'];      }
  my $response = $ENV{'form.HWVAL'.$id};      $i--;
  my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);   }
  if ( $response =~ /[^\s]/) {      }
   $Apache::lonhomework::results{"resource.$partid.$id.$name"}=      return $package;
     $response;  
   $Apache::lonhomework::results{  
  "resource.$partid.$id.submission"}=  
   $response;  
   $Apache::lonhomework::results{  
  "resource.$partid.$id.awarddetail"}=  
   'SUBMITTED';  
  }  
       } else {  
  $result='Not Permitted to change values.'  
       }  
     }  
   }  
   &Apache::response::end_response;  
   return $result;  
 }  }
   
 sub start_responseparam {  sub start_responseparam {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $result='';      my $result='';
   if ($target eq 'meta') {      if ($target eq 'meta') {
     $result = &meta_parameter_write($token->[2]->{'name'},   $result = &meta_parameter_write($token->[2]->{'name'},
     $token->[2]->{'type'},   $token->[2]->{'type'},
     $token->[2]->{'default'},   $token->[2]->{'default'},
     $token->[2]->{'description'});   $token->[2]->{'description'});
   } elsif ($target eq 'edit') {      } elsif ($target eq 'edit') {
     $result.=&Apache::edit::tag_start($target,$token,   $result.=&Apache::edit::tag_start($target,$token);
       &Apache::lonxml::description($token));   my $optionlist;
     $result.=&Apache::edit::text_arg('Name:','name',$token).   my $package=&decide_package($tagstack);
       &Apache::edit::text_arg('Type:','type',$token).   foreach my $key (sort(keys(%Apache::lonnet::packagetab))) {
  &Apache::edit::text_arg('Description:','description',$token).      if ($key =~ /^\Q$package\E&(.*)&display$/) {
   &Apache::edit::text_arg('Default:','default',$token).   $optionlist.='<option value="'.$1.'">'.
     "</td></tr>";      $Apache::lonnet::packagetab{$key}.'</option>';
     $result.=&Apache::edit::end_table;      }
   } elsif ($target eq 'modified') {   }
     my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,   if (defined($optionlist)) {
  'name','type','description',      $result.='Use template: <select name="'.
  'default');   &Apache::edit::html_element_name('parameter_package').'">'.
     if ($constructtag) {      '<option value=""></option>'.$optionlist.'</select><br />';
       $result = &Apache::edit::rebuild_tag($token);   }
       $result.=&Apache::edit::handle_insert();   $result.=&Apache::edit::text_arg('Name:','name',$token).
     }      &Apache::edit::text_arg('Type:','type',$token).
   } elsif ($target eq 'grade') {   &Apache::edit::text_arg('Description:','description',$token).
     if ($ENV{'request.state'} eq 'construct') {      &Apache::edit::text_arg('Default:','default',$token).
       my $name    = &Apache::lonxml::get_param('name',$parstack,$safeeval);   "</td></tr>";
       my $default = &Apache::lonxml::get_param('default',$parstack,$safeeval);   $result.=&Apache::edit::end_table;
       $Apache::inputtags::params{$name}=$default;      } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'name','type',
        'description','default');
    my $element=&Apache::edit::html_element_name('parameter_package');
    if (defined($env{"form.$element"}) && $env{"form.$element"} ne '') {
       my $name=$env{"form.$element"};
       my $tag=&decide_package($tagstack);
       $token->[2]->{'name'}=$name;
       $token->[2]->{'type'}=
    $Apache::lonnet::packagetab{"$tag&$name&type"};
       $token->[2]->{'description'}=
    $Apache::lonnet::packagetab{"$tag&$name&display"};
       $token->[2]->{'default'}=
    $Apache::lonnet::packagetab{"$tag&$name&default"};
       $constructtag=1;
    }
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
    }
       } elsif ($target eq 'grade' || $target eq 'answer' || $target eq 'web' ||
        $target eq 'tex' || $target eq 'analyze' ) {
    if ($env{'request.state'} eq 'construct') {
       my $name   =&Apache::lonxml::get_param('name',$parstack,$safeeval);
       my $default=&Apache::lonxml::get_param('default',$parstack,
        $safeeval);
       if ($name) {$Apache::inputtags::params{$name}=$default;}
    }
     }      }
   }      return $result;
   return $result;  
 }  }
   
 sub end_responseparam {  sub end_responseparam {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   if ($target eq 'edit') { return ('','no'); }      if ($target eq 'edit') { return ('','no'); }
   return '';      return '';
   }
   
   sub start_parameter {
       return &start_responseparam(@_);
   }
   
   sub end_parameter {
       return &end_responseparam(@_);
   }
   
   sub reset_params {
       %Apache::inputtags::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; }
   @Apache::inputtags::params=();      my %paramlist=();
   my %paramlist=();      foreach my $key (keys(%Apache::lonnet::packagetab)) {
   foreach my $key (keys(%Apache::lonnet::packagetab)) {   if ($key =~ /^\Q$tag\E/) {
     if ($key =~ /^$tag/) {      my ($package,$name) = split(/&/,$key);
       my ($package,$name) = split(/&/,$key);      $paramlist{$name}=1;
       $paramlist{$name}=1;   }
     }  
   }  
   foreach my $key (keys(%paramlist)) {  
     my $entry= 'resource.'.$Apache::inputtags::part;  
     if (defined($Apache::inputtags::response[-1])) {  
       $entry.='_'.$Apache::inputtags::response[-1];  
     }      }
     $entry.='.'.$key;      foreach my $key (keys(%paramlist)) {
     &Apache::lonxml::debug("looking for $entry");   my $entry= 'resource.'.$Apache::inputtags::part;
     my $value = &Apache::lonnet::EXT("$entry");   if (defined($Apache::inputtags::response[-1])) {
     &Apache::lonxml::debug("$key has value :$value:");      $entry.='_'.$Apache::inputtags::response[-1];
     if ($value eq 'con_lost' || $value =~ /^error:/) {   }
       &Apache::lonxml::debug("using nothing");   $entry.='.'.$key;
       $Apache::inputtags::params{$key}='';   &Apache::lonxml::debug("looking for $entry");
     } else {   my $value = &Apache::lonnet::EXT("$entry");
       &Apache::lonxml::debug("using value");   &Apache::lonxml::debug("$key has value :$value:");
       $Apache::inputtags::params{$key}=$value;   if ($value eq 'con_lost' || $value =~ /^error:/) {
       &Apache::lonxml::debug("using nothing");
       $Apache::inputtags::params{$key}='';
    } else {
       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;
    }
     }      }
   }  
 }  }
   
   {
       my @answer_bits;
       my $need_row_start;
   
 sub answer_header {  sub answer_header {
   my ($type) = @_;      my ($type,$increment,$rows) = @_;
   my $result;      my $result;
   if ($type eq 'optionresponse' || $type eq 'radiobuttonresponse' ) {      if ($env{'form.answer_output_mode'} eq 'tex') {
     $result = '<table border="1"><tr><th>Answer for Part:'.   undef(@answer_bits);
       $Apache::inputtags::part. '</th></tr><tr>'."\n";   my $bit;
   } else {   if ($Apache::lonhomework::type eq 'exam') {
     $result = '<table border="1"><tr><td>Answer for Part:'.      $bit = ($Apache::lonxml::counter+$increment).') ';
       $Apache::inputtags::part. '</td>'."\n";   } else {
   }      $bit .= ' Answer for Part: \verb|'.
   return $result;   $Apache::inputtags::part.'| ';
    }
    push(@answer_bits,$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 $result;
       if ($env{'form.answer_output_mode'} eq 'tex') {
    # FIXME ... need to do something with tex mode
       } else {
    $result .= "</tr>";
    $need_row_start = 1;
       }
       return $result;
 }  }
   
 sub answer_part {  sub answer_part {
   my ($type,$answer) = @_;      my ($type,$answer,$args) = @_;
   my $result;      my $result;
   if ($type eq 'optionresponse' || $type eq 'radiobuttonresponse') {      if ($env{'form.answer_output_mode'} eq 'tex') {
     $result = '<td>'.$answer.'</td>';   if (!$args->{'no_verbatim'}) {
   } else {      my $to_use='|';
     $result = '<td>'.$answer.'</td>';      foreach my $value (32..126) {
   }   my $char=pack('c',$value);
   return $result;   if ($answer !~ /\Q$char\E/) {
       $to_use=$char;
       last;
    }
       }
       if ($answer ne '') {
    $answer = '\verb'.$to_use.$answer.$to_use;
       }
    }
    if ($answer ne '') {
       push(@answer_bits,$answer);
    }
       } else {
    if ($need_row_start) {
       $result .= '<tr>';
       $need_row_start = 0;
    }
    $result .= '<td>'.$answer.'</td>';
       }
       return $result;
 }  }
   
 sub answer_footer {  sub answer_footer {
   my ($type) = @_;      my ($type) = @_;
   my $result;      my $result;
   if ($type eq 'optionresponse' || $type eq 'radiobuttonresponse') {      if ($env{'form.answer_output_mode'} eq 'tex') {
     $result = '</tr></table>';   my $columns = scalar(@answer_bits);
   } else {   $result  = ' \vskip 0 mm \noindent \begin{tabular}{|'.'c|'x$columns.'}\hline ';
     $result = '</tr></table>';   $result .= join(' & ',@answer_bits);
   }   $result .= ' \\\\ \\hline \end{tabular} \vskip 0 mm ';
   return $result;      } else {
    $result = '</tr></table>';
       }
       return $result;
   }
   
   }
   
   sub showallfoils {
       if (defined($env{'form.showallfoils'})) {
    my ($symb)=&Apache::lonnet::whichuser();
    if (($env{'request.state'} eq 'construct') || 
       ($env{'user.adv'} && $symb eq '')      ||
               ($Apache::lonhomework::viewgrades) ) {
       return 1;
    }
       }
       if ($Apache::lonhomework::type eq 'survey') { return 1; }
       return 0;
   }
   
   =pod
   
   =item &getresponse($offset,$resulttype);
   
   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 - if a problem has more than one bubble response, pass in the number
               of the bubble wanted
     $resulttype - undef    -> a number between 0 and 25
                   'A is 1' -> a number between 1 and 26
                   'letter' -> a letter between 'A' and 'Z'
   
   =cut
   
   sub getresponse {
       my ($offset,$resulttype)=@_;
       my $formparm='form.HWVAL_'.$Apache::inputtags::response['-1'];
       my $response;
       if (!defined($offset)) {
    my $temp=1;
       } else {
    $formparm.=":$offset";
       }
       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,
       'P'=>15,'Q'=>16,'R'=>17,'S'=>18,'T'=>19,'U'=>20,'V'=>21,
       'W'=>22,'X'=>23,'Y'=>24,'Z'=>25);
       if ($env{'form.submitted'} eq 'scantron') {
    my $part  = $Apache::inputtags::part;
    my $id    = $Apache::inputtags::response[-1];
    $response = $env{'scantron.'.($Apache::lonxml::counter+$offset-1).
    '.answer'};
    # save bubbled letter for later
    $Apache::lonhomework::results{"resource.$part.$id.scantron"}.=
       $response;
    if ($resulttype ne 'letter') {
       if ($resulttype eq 'A is 1') {
    $response = $let_to_num{$response}+1;
       } else {
    $response = $let_to_num{$response};
       }
    }
       } else {
    $response = $env{$formparm};
       }
       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 {
       my $id = $Apache::inputtags::part;
       my $weight = &Apache::lonnet::EXT("resource.$id.weight");
       if (!defined($weight) || ($weight eq '')) { $weight=1; }
       my $repetition = int($weight/10);
       if ($weight % 10 != 0) { $repetition++; } 
       return $repetition;
   }
   
   =pod
   
   =item &scored_response($part_id,$response_id);
   
   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 {
       my ($part,$id)=@_;
       my $repetition=&repetition();
       my $score=0;
       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);
    if ($increase ne '') { $score+=$increase+1; }
       }
       my $weight = &Apache::lonnet::EXT("resource.$part.weight");
       if (!defined($weight) || $weight eq '' || $weight eq 0) { $weight = 1; }
       my $pcr=$score/$weight;
       $Apache::lonhomework::results{"resource.$part.$id.awarded"}=$pcr;
       $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=
    'ASSIGNED_SCORE';
       return $repetition;
   }
   
   sub whichorder {
       my ($max,$randomize,$showall,$hash)=@_;
       #&Apache::lonxml::debug("man $max randomize $randomize");
       if (!defined(@{ $$hash{'names'} })) { return; }
       my @names = @{ $$hash{'names'} };
       my @whichopt =();
       my (%top,@toplist,%bottom,@bottomlist);
       if (!($showall || ($randomize eq 'no'))) {
    my $current=0;
    foreach my $name (@names) {
       $current++;
       if ($$hash{"$name.location"} eq 'top') {
    $top{$name}=$current;
       } elsif ($$hash{"$name.location"} eq 'bottom') {
    $bottom{$name}=$current;
       }
    }
       }
       my $topcount=0;
       my $bottomcount=0;
       while (((scalar(@whichopt)+$topcount+$bottomcount) < $max || $showall)
      && ($#names > -1)) {
    #&Apache::lonxml::debug("Have $#whichopt max is $max");
    my $aopt;
    if ($showall || ($randomize eq 'no')) {
       $aopt=0;
    } else {
       $aopt=int(&Math::Random::random_uniform() * ($#names+1));
    }
    #&Apache::lonxml::debug("From $#whichopt $max $#names elms, picking $aopt");
    $aopt=splice(@names,$aopt,1);
    #&Apache::lonxml::debug("Picked $aopt");
    if ($top{$aopt}) {
       $toplist[$top{$aopt}]=$aopt;
       $topcount++;
    } elsif ($bottom{$aopt}) {
       $bottomlist[$bottom{$aopt}]=$aopt;
       $bottomcount++;
    } else {
       push (@whichopt,$aopt);
    }
       }
       for (my $i=0;$i<=$#toplist;$i++) {
    if ($toplist[$i]) { unshift(@whichopt,$toplist[$i]) }
       }
       for (my $i=0;$i<=$#bottomlist;$i++) {
    if ($bottomlist[$i]) { push(@whichopt,$bottomlist[$i]) }
       }
       return @whichopt;
   }
   
   sub show_answer {
       my $part   = $Apache::inputtags::part;
       my $award  = $Apache::lonhomework::history{"resource.$part.solved"};
       my $status = $Apache::inputtags::status[-1];
       return  ( ($award =~ /^correct/
          && lc($Apache::lonhomework::problemstatus) ne 'no')
         || $status eq "SHOW_ANSWER");
   }
   
   sub analyze_store_foilgroup {
       my ($shown,$attrs)=@_;
       my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
       foreach my $name (@{ $Apache::response::foilgroup{'names'} }) {
    if (defined($Apache::lonhomework::analyze{"$part_id.foil.value.$name"})) { next; }
    push (@{ $Apache::lonhomework::analyze{"$part_id.foils"} },$name);
    foreach my $attr (@$attrs) {
       $Apache::lonhomework::analyze{"$part_id.foil.".$attr.".$name"} =
    $Apache::response::foilgroup{"$name.".$attr};
    }
       }
       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 {
       my ($target,$attrs,$hinthash,$parstack,$safeeval)=@_;
       if (not defined(@{ $Apache::response::conceptgroup{'names'} })) { return; }
       my @names = @{ $Apache::response::conceptgroup{'names'} };
       my $pick=int(&Math::Random::random_uniform() * ($#names+1));
       my $name=$names[$pick];
       push @{ $Apache::response::foilgroup{'names'} }, $name;
       foreach my $attr (@$attrs) {
    $Apache::response::foilgroup{"$name.".$attr} =
       $Apache::response::conceptgroup{"$name.".$attr};
       }
       my $concept = &Apache::lonxml::get_param('concept',$parstack,$safeeval);
       $Apache::response::foilgroup{"$name.concept"} = $concept;
       &Apache::lonxml::debug("Selecting $name in $concept");
       my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
       if ($target eq 'analyze') {
    push (@{ $Apache::lonhomework::analyze{"$part_id.concepts"} },
         $concept);
    $Apache::lonhomework::analyze{"$part_id.concept.$concept"}=
       $Apache::response::conceptgroup{'names'};
    foreach my $name (@{ $Apache::response::conceptgroup{'names'} }) {
       push (@{ $Apache::lonhomework::analyze{"$part_id.foils"} },
     $name);
       foreach my $attr (@$attrs) {
    $Apache::lonhomework::analyze{"$part_id.foil.$attr.$name"}=
       $Apache::response::conceptgroup{"$name.$attr"};
       }
    }
       }
       push(@{ $hinthash->{"$part_id.concepts"} },$concept);
       $hinthash->{"$part_id.concept.$concept"}=
    $Apache::response::conceptgroup{'names'};
   
   }
   #------------------------------------------------------------
   #
   #  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
   #  $default   - Default value for the paramter.
   #
   #  
   #
   sub get_response_param {
       my ($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 occured
       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");
       }
   }
   
   # 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
   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;
   }
   
   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;
Removed from v.1.54  
changed lines
  Added in v.1.169

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