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- grades a question and sets the global result codes

# The LearningOnline Network with CAPA
# caparesponse definition

package Apache::caparesponse;
use strict;
use capa;

sub BEGIN {
  &Apache::lonxml::register('Apache::caparesponse',('caparesponse'));
}

$Apache::caparesponse::result='';
sub start_caparesponse {
  my ($target,$token,$parstack,$parser,$safeeval)=@_;
  my $args ='';
  if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
  my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
  push (@Apache::inputtags::response,$id);

  #my $envkey;
  #foreach $envkey (sort keys %ENV) {
  #  Apache::lonxml::debug("$envkey ---- $ENV{$envkey}<br>");
  #}
  #Apache::lonxml::debug("\n<br>\nreal caparesponse<br>\n");
}

sub end_caparesponse {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  my $result = '';
  if ( defined $ENV{'form.'.$ENV{'form.request.prefix'}.'submit'}) {
    $Apache::caparesponse::result='';
    $safeeval->share_from('capa',['&caparesponse_capa_check_answer']);
    my $response = $ENV{'form.HWVAL'.$Apache::inputtags::curvalue};
    $Apache::lonhomework::results{"resource.submission.part$Apache::inputtags::part['-1'].response$Apache::inputtags::response['-1']"}=$response;
    &Apache::lonxml::debug("submitted a $response<br>\n");
    &Apache::lonxml::debug($$parstack[$#$parstack] . "\n<br>");
    my $tol=$Apache::inputtags::{'tol'};
    my $expression="&caparesponse_check('".$response."','".
      $$parstack[$#$parstack].
	';my $tol='.$Apache::inputtags::{'tol'}.
	  "');";
    $result = &Apache::run::run($expression,$safeeval);
    
    &Apache::lonxml::debug("\n<br>result:$Apache::caparesponse::result:$result:$Apache::lonxml::curdepth<br>\n");
    
  } else {
    #return "The correct answer is ".&Apache::run::run("{$$parstack['-1'];".'return $answer}',$safeeval)."\n";
  }
  #Apache::lonxml::debug("\n<br>\nreal end caparesponse<br>\n");
  pop @Apache::inputtags::part;
  return '';
}

1;
__END__