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    1: # The LearningOnline Network with CAPA
    2: # mutliple choice style responses
    3: 
    4: package Apache::radiobuttonresponse;
    5: use strict;
    6: 
    7: sub BEGIN {
    8:   &Apache::lonxml::register('Apache::radiobuttonresponse',('radiobuttonresponse'));
    9: }
   10: 
   11: sub start_radiobuttonresponse {
   12:   my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
   13:   #when in a radiobutton response use these
   14:   &Apache::lonxml::register('Apache::radiobuttonresponse',('foilgroup','foil'));
   15:   my $id = &Apache::response::start_response($parstack,$safeeval);
   16:   return '';
   17: }
   18: 
   19: sub end_radiobuttonresponse {
   20:   &Apache::response::end_response;
   21:   return '';
   22: }
   23: 
   24: %Apache::response::foilgroup={};
   25: sub start_foilgroup {
   26:   %Apache::response::foilgroup={};
   27:   return '';
   28: }
   29: 
   30: sub setrandomnumber {
   31:   my $rndseed=&Apache::lonnet::rndseed();
   32:   $rndseed=unpack("%32i",$rndseed);
   33:   $rndseed=$rndseed
   34:     +&Apache::lonnet::numval($Apache::inputtags::part)
   35:       +&Apache::lonnet::numval($Apache::inputtags::response['-1']);
   36:   srand($rndseed);
   37:   return '';
   38: }
   39: 
   40: sub end_foilgroup {
   41:   my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
   42:   
   43:   my $result;
   44:   if ($target ne 'meta') {
   45:     my $name;
   46:     &setrandomnumber();
   47:     my ($truecnt,$falsecnt,$max) = &getfoilcounts($parstack,$safeeval);
   48:     my $count=0;
   49:     # we will add in 1 of the true statements
   50:     if (($falsecnt+1)>$max) { $count=$max } else { $count=$falsecnt+1; }
   51:     my $answer = int(rand ($count));
   52:     &Apache::lonxml::debug("Answer is $answer, $count from $max, $falsecnt");
   53:     if ($target eq 'web') {
   54:       $result=&displayfoils($max,$answer);
   55:     } elsif ( $target eq 'grade') {
   56:       if ( defined $ENV{'form.submitted'}) {
   57: 	my $response = $ENV{'form.HWVAL'.$Apache::inputtags::response['-1']};
   58: 	if ( $response =~ /[^\s]/) {
   59: 	  my $id = $Apache::inputtags::response['-1'];
   60: 	  $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}=$response;
   61: 	  &Apache::lonxml::debug("submitted a $response<br>\n");
   62: 	  if ($response == $answer) {
   63: 	    $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}='EXACT_ANS';
   64: 	  } else {
   65: 	    $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}='INCORRECT';
   66: 	  }
   67: 	}
   68:       }
   69:     }
   70:   }
   71:   return $result;
   72: }
   73: 
   74: sub getfoilcounts {
   75:   my ($parstack,$safeeval)=@_;
   76:   my $rrargs ='';
   77:   if ( $#$parstack > 0 ) { $rrargs=$$parstack['-2']; }
   78:   my $max = &Apache::run::run("{$rrargs;".'return $max}',$safeeval);
   79:   my @names = @{ $Apache::response::foilgroup{'names'} };
   80:   my $truecnt=0;
   81:   my $falsecnt=0;
   82:   my $name;
   83: 
   84:   foreach $name (@names) {
   85:     if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
   86:       $truecnt++;
   87:     } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
   88:       $falsecnt++;
   89:     }
   90:   }
   91:   return ($truecnt,$falsecnt,$max);
   92: }
   93: 
   94: sub displayfoils {
   95:   my ($max,$answer)=@_;
   96:   my @names = @{ $Apache::response::foilgroup{'names'} };
   97:   my @truelist;
   98:   my @falselist;
   99:   my $result;
  100:   my $name;
  101: 
  102:   foreach $name (@names) {
  103:     #result.="<br><b>$name</b> is <i> $Apache::response::foilgroup{$name.'.value'} </i>";
  104:     if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
  105:       push (@truelist,$name);
  106:     } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
  107:       push (@falselist,$name);
  108:     } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {
  109:     } else {
  110:       &Apache::lonxml::error("Unknown state $Apache::response::foilgroup{$name.'.value'} for $name in <foilgroup>");
  111:     }
  112:   }
  113:   my $whichtrue = rand $#truelist;
  114:   &Apache::lonxml::debug("Max is $max, From $#truelist elms, picking $whichtrue");
  115:   my @whichfalse =();
  116:   while ((($#whichfalse+2) < $max) && ($#falselist > -1)) {
  117:     my $afalse=rand $#falselist;
  118:     &Apache::lonxml::debug("From $#falselist elms, picking $afalse");
  119:     $afalse=splice(@falselist,$afalse,1);
  120:     &Apache::lonxml::debug("Picked $afalse");
  121:     push (@whichfalse,$afalse);
  122:   }
  123:   splice(@whichfalse,$answer,0,$truelist[$whichtrue]);
  124:   my $temp=0;
  125:   &Apache::lonxml::debug("the true statement is $answer");
  126:   foreach $name (@whichfalse) {
  127:     $result.="<br /><input type=\"radio\" name=\"HWVAL$Apache::inputtags::response['-1']\" value=\"$temp\">".$Apache::response::foilgroup{$name.'.text'}."</input>\n";
  128:     $temp++;
  129:   }
  130:   return $result."<br />";
  131: }
  132: 
  133: sub start_foil {
  134:   $Apache::lonxml::redirection--;
  135:   return '';
  136: }
  137: 
  138: sub end_foil {
  139:   my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  140:   if ($target eq 'web' || $target eq 'grade') {
  141:     my $args ='';
  142:     if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
  143:     my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);
  144:     push @{ $Apache::response::foilgroup{'names'} }, $name;
  145:     my $value = &Apache::run::run("{$args;".'return $value}',$safeeval);
  146:     $Apache::response::foilgroup{"$name.value"} = $value;
  147:     $Apache::response::foilgroup{"$name.text"} = $Apache::lonxml::outputstack;
  148:   }
  149:   
  150:   $Apache::lonxml::redirection++;
  151:   if ($Apache::lonxml::redirection == 1) { 
  152:     $Apache::lonxml::outputstack=''; 
  153:   }
  154:   return '';
  155: }
  156: 
  157: 1;
  158: __END__
  159: