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 Now can be printed in the exam mode. Note that I've changed the numeration to the boxes according to Ed's desire (the same is true with respect to matchresponse problems eather). Needs additional work for the screen output (I did not care about this until this point). Continue.

# The LearningOnline Network with CAPA
# rank style response
#
# $Id: rankresponse.pm,v 1.4 2003/03/19 14:23:38 sakharuk Exp $
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# 2/21 Guy

package Apache::rankresponse;
use strict;
use HTML::Entities();
use Apache::optionresponse;

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

sub start_rankresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    #when in a rank response use these
    &Apache::lonxml::register('Apache::rankresponse',
			      ('foilgroup','foil','conceptgroup'));
    push (@Apache::lonxml::namespace,'rankresponse');
    my $id = &Apache::response::start_response($parstack,$safeeval);
    %Apache::hint::rank=();
    if ($target eq 'meta') {
	$result=&Apache::response::meta_package_write('rankresponse');
    } elsif ($target eq 'edit' ) {
	$result.=&Apache::edit::start_table($token).
	    '<tr><td>'.&Apache::lonxml::description($token)."</td><td>Delete:".
	    &Apache::edit::deletelist($target,$token)
	    ."</td><td>&nbsp".&Apache::edit::end_row()
	    .&Apache::edit::start_spanning_row();
	
	$result.=
	    &Apache::edit::text_arg('Max Number Of Shown Foils:','max',$token,'4').
	    &Apache::edit::select_arg('Randomize Foil Order','randomize',
				      ['yes','no'],$token).
	    &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n";
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'max',
						     'randomize');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

sub end_rankresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
    &Apache::response::end_response;
    pop @Apache::lonxml::namespace;
    &Apache::lonxml::deregister('Apache::rankresponse',
				('foilgroup','foil','conceptgroup'));
    return $result;
}

%Apache::response::foilgroup=();
sub start_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    %Apache::response::foilgroup=();
    $Apache::rankresponse::conceptgroup=0;
    &Apache::response::setrandomnumber();
    return $result;
}

sub end_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
	my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
	my $randomize = &Apache::lonxml::get_param('randomize',$parstack,
						   $safeeval,'-2');
	my $tol = &Apache::lonxml::get_param('tol',$parstack,$safeeval,'-2');
	if (!defined($tol)) { $tol=0; }
	if ($target eq 'web' || $target eq 'tex') {
	    $result=&displayfoils($target,$max,$randomize,$tol);
	} elsif ($target eq 'answer' ) {
	    $result=&displayanswers($max,$randomize,$tol);
	} elsif ( $target eq 'grade') {
	    &grade_response($max,$randomize,$tol);
	}
    }
    return $result;
}

sub get_correct_order {
    my ($tol,@foils) =@_;
    my @correctorder;
    my @value_names;
    foreach my $name (@foils) {
	my @pair=($Apache::response::foilgroup{$name.'.value'},$name);
	push(@value_names,\@pair);
    }
    @value_names =
	sort {
	    if (abs($a->[0] - $b->[0]) > $tol) {return ($a->[0] cmp $b->[0]);}
	    return 0;
	} @value_names;
    my @value_names_tmp=@value_names;
    my $firstpair=shift(@value_names_tmp);
    my $order=1;
    my %order;
    my $count=1;
    my $lastvalue=$firstpair->[0];
    $order{$firstpair->[1]}=$order;
    foreach my $pair (@value_names_tmp) {
	$count++;
	if (abs($pair->[0]-$lastvalue) > $tol ) {
	    $order=$count;
	}
	$order{$pair->[1]}=$order;
	$lastvalue=$pair->[0];
    }
    foreach my $name (@foils) {
	push(@correctorder,$order{$name});
    }
    &Apache::lonhomework::showhash('b' => \@value_names);
    &Apache::lonhomework::showhash('b' => \@correctorder);
    return @correctorder;
}

sub displayanswers {
    my ($max,$randomize,$tol,@opt)=@_;
    if (!defined(@{ $Apache::response::foilgroup{'names'} })) { return; }
    my @names = @{ $Apache::response::foilgroup{'names'} };
    my @whichfoils = &whichfoils($max,$randomize);
    my $result=&Apache::response::answer_header('rankresponse');
    my @correctorder=&get_correct_order($tol,@whichfoils);
    foreach my $order (@correctorder) {
	$result.=&Apache::response::answer_part('rankresponse',$order);
    }
    $result.=&Apache::response::answer_footer('rankresponse');
    return $result;
}

sub check_response_order {
    my (%responsehash)=@_;
    my @order=sort(values(%responsehash));
    my $lastvalue=0;
    my $expected=1;
    my $malformed=0;
    foreach my $current (@order) {
	&Apache::lonxml::debug("$lastvalue $expected $malformed");
	if (!($current == $lastvalue || $current == $expected)) {
	    $malformed=1;
	}
	$expected++;
	$lastvalue=$current;
    }
    return $malformed;
}

sub grade_response {
    my ($max,$randomize,$tol)=@_;
    my (@whichfoils)=&whichfoils($max,$randomize);
    if (!defined($ENV{'form.submitted'})) { return; }
    my %responsehash;
    my %grade;
    my ($temp,$right,$wrong,$ignored)=(0,0,0,0);
    my @correctorder=&get_correct_order($tol,@whichfoils);
    foreach my $name (@whichfoils) {
	my $response = $ENV{'form.HWVAL_'.$Apache::inputtags::response['-1'].":$temp"};
	$responsehash{$name}=$response;
	my $value=shift(@correctorder);
	if ( $response =~ /[^\s]/) {
	    &Apache::lonxml::debug("submitted a $response for $value<br />\n");
	    if ($value eq $response) {
		$grade{$name}='1'; $right++;
	    } else {
		$grade{$name}='0'; $wrong++;
	    }
	} else {
	    $ignored++;
	}
	$temp++;
    }
    my $malformed=&check_response_order(%responsehash);
    my $part=$Apache::inputtags::part;
    my $id = $Apache::inputtags::response['-1'];
    my $responsestr=&Apache::lonnet::hash2str(%responsehash);
    my $gradestr   =&Apache::lonnet::hash2str(%grade);
    my %previous=&Apache::response::check_for_previous($responsestr,
						       $part,$id);
    &Apache::lonxml::debug("Got $right right and $wrong wrong, and $ignored were ignored and was $malformed malformed");
    my $ad;
    if ($malformed) {
	$ad='MISORDERED_RANK';
    } elsif ($wrong==0 && $ignored==0) {
	$ad='EXACT_ANS';
    } elsif ($wrong==0 && $right==0) {
	#nothing submitted
    } else {
	if ($ignored==0) {
	    $ad='INCORRECT';
	} else {
	    $ad='MISSING_ANSWER';
	}
    }
    $Apache::lonhomework::results{"resource.$part.$id.submission"}=
	$responsestr;
    $Apache::lonhomework::results{"resource.$part.$id.submissiongrading"}=$gradestr;
    $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$ad;
    &Apache::response::handle_previous(\%previous,$ad);
}

sub displayfoils {
    my ($target,$max,$randomize,$tol)=@_;
    my $result;
    my @alphabet=('A'..'Z');
    my (@whichfoils)=&whichfoils($max,$randomize);
    my $part=$Apache::inputtags::part;
    my $solved=$Apache::lonhomework::history{"resource.$part.solved"};
    my $status=$Apache::inputtags::status[-1];
    my @whichopt=(1..($#whichfoils+1));
    my @correctorder=&get_correct_order($tol,@whichfoils);
    if (($solved =~ /^correct/) || ($status eq  'SHOW_ANSWER')) {
	foreach my $name (@whichfoils) {
	    my $text=$Apache::response::foilgroup{$name.'.text'};
	    my $value=shift(@correctorder);
	    $result.='<br />'.$value.':'.$text;
	}
    } else {
	my $i = 0;
	my $temp=0;
	my $id=$Apache::inputtags::response[-1];
	my $part=$Apache::inputtags::part;
	my $lastresponse=$Apache::lonhomework::history{"resource.$part.$id.submission"};
	my %lastresponse=&Apache::lonnet::str2hash($lastresponse);
	foreach my $name (@whichfoils) {
	    my $lastopt=$lastresponse{$name};
	    my $optionlist='';
	    if ($target ne 'tex') {$optionlist="<option></option>\n";}
	    my $option;
	    foreach $option (@whichopt) {
		if ($option eq $lastopt) {
		    if ($target ne 'tex') {$optionlist.="<option selected=\"on\">$option</option>\n";}
		} else {
		    if ($target ne 'tex') {$optionlist.="<option>$option</option>\n";}
		}
	    }
	    if ($target ne 'tex') {
		$optionlist='<select name="HWVAL_'.
		    $Apache::inputtags::response[-1].':'.$temp.'">'.
		        $optionlist."</select>\n";
	    } else {
		$optionlist=' '.$temp.' '.$optionlist.' ';
	    }
	    my $text=$Apache::response::foilgroup{$name.'.text'};
	    if ($target ne 'tex') {
		$result.='<br />'.$optionlist.$text."\n";
		if ($Apache::lonhomework::type eq 'exam') {
		    $result.=&Apache::optionresponse::webbubbles(\@alphabet,\@whichopt);
		}
	    } else {
		if ($Apache::lonhomework::type eq 'exam') {
		    $result.=' \framebox[5 mm][s]{\tiny\strut} '.$text."\n";
		    $result.='\begin{enumerate}\item[\textbf{'.$Apache::lonxml::counter.'}.]'.&Apache::optionresponse::bubbles(\@alphabet,\@whichopt).'\end{enumerate}\strut ';
		    &Apache::lonxml::increment_counter();
		} else {
		$result.=' \\\\ \framebox[5 mm][s]{\tiny\strut} '.$text."\n";
		}
	    }
	    $temp++;
	}
    }
    if ($target ne 'tex') {$result.="<br />";} else {$result.=' \\\\ ';}
    return $result;
}

sub getfoilcounts {
    my ($max)=@_;
    # +1 since instructors will count from 1
    my $count = $#{ $Apache::response::foilgroup{'names'} }+1;
    if (&Apache::response::showallfoils()) { $max=$count; }
    if ($count>$max) { $count=$max } 
    &Apache::lonxml::debug("Count is $count from $max");
    return $count;
}

sub whichfoils {
    my ($max,$randomize)=@_;
    $max = &getfoilcounts($max);
 #   &Apache::lonxml::debug("man $max randomize $randomize");
    if (!defined(@{ $Apache::response::foilgroup{'names'} })) { return; }
    my @names = @{ $Apache::response::foilgroup{'names'} };
    my @whichopt =();
    my (%top,@toplist,%bottom,@bottomlist);
    if (!(&Apache::response::showallfoils() || ($randomize eq 'no'))) {
	my $current=0;
	foreach my $name (@names) {
	    $current++;
	    if ($Apache::response::foilgroup{"$name.location"} eq 'top') {
		$top{$name}=$current;
	    } elsif ($Apache::response::foilgroup{"$name.location"} eq
		     'bottom') {
		$bottom{$name}=$current;
	    }
	}
    }
    while ((($#whichopt+1) < $max) && ($#names > -1)) {
#	&Apache::lonxml::debug("Have $#whichopt max is $max");
	my $aopt;
	if (&Apache::response::showallfoils() || ($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;
	} elsif ($bottom{$aopt}) {
	    $bottomlist[$bottom{$aopt}]=$aopt;
	} else {
	    push (@whichopt,$aopt);
	}
    }
#    &Apache::lonxml::debug("Grr, ".$#whichopt.":".$#toplist.':'.$#bottomlist);
    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]) }
    }
    &Apache::lonxml::debug("Grr, ".$#whichopt.":".$#toplist.':'.$#bottomlist);
    return @whichopt;
}

sub start_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    $Apache::rankresponse::conceptgroup=1;
    %Apache::response::conceptgroup=();
    my $result;
    if ($target eq 'edit') {
	$result.=&Apache::edit::tag_start($target,$token,
					  "Concept Grouped Foils");
	$result.=&Apache::edit::text_arg('Concept:','concept',$token,'50').
	    &Apache::edit::end_row().&Apache::edit::start_spanning_row();
    }
    if ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'concept');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

sub end_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    $Apache::rankresponse::conceptgroup=0;
    my $result='';
    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ) {
	#if not there aren't any foils to display and thus no question
	if (defined(@{ $Apache::response::conceptgroup{'names'} })) {
	    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;
	    $Apache::response::foilgroup{"$name.value"} =
		$Apache::response::conceptgroup{"$name.value"};
	    $Apache::response::foilgroup{"$name.text"} =
		$Apache::response::conceptgroup{"$name.text"};
	    $Apache::response::foilgroup{"$name.location"} =
		$Apache::response::conceptgroup{"$name.location"};
	    my $concept = &Apache::lonxml::get_param('concept',$parstack,
						     $safeeval);
	    $Apache::response::foilgroup{"$name.concept"} = $concept;
	    &Apache::lonxml::debug("Selecting $name in $concept");
	    if ($target eq 'web') {
		my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
		push(@{ $Apache::hint::rank{"$part_id.concepts"} },
		     $concept);
		$Apache::hint::rank{"$part_id.concept.$concept"}=
		    $Apache::response::conceptgroup{'names'};
	    }
	}
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::end_table();
    }
    return $result;
}

sub insert_conceptgroup {
    my $result="\n\t\t<conceptgroup concept=\"\">".&insert_foil()."\n\t\t</conceptgroup>\n";
    return $result;
}

sub start_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result='';
    if ($target eq 'web' || $target eq 'tex') {
	&Apache::lonxml::startredirection;
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::tag_start($target,$token,"Foil");
	my $level='-2';
	if ($$tagstack[-2] eq 'conceptgroup') { $level = '-3'; }
	$result.=&Apache::edit::text_arg('Name:','name',$token);
	$result.= &Apache::edit::text_arg('Rank Value:','value',$token,'15');
	my $randomize=&Apache::lonxml::get_param('randomize',$parstack,
						 $safeeval,'-3');
	if ($randomize ne 'no') {
	    $result.=&Apache::edit::select_arg('Location:','location',
					     ['random','top','bottom'],$token);
	}
	$result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'value',
						     'name','location');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

sub end_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $text ='';
    my $result = '';
    if ($target eq 'web' || $target eq 'tex') {
	$text=&Apache::lonxml::endredirection;
    }
    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
	my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
	if ($value ne 'unused') {
	    my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
	    my $location =&Apache::lonxml::get_param('location',$parstack,$safeeval);
	    &Apache::lonxml::debug("Got a name of :$name:");
	    if (!$name) { $name=$Apache::lonxml::curdepth; }
	    &Apache::lonxml::debug("Using a name of :$name:");
	    if ( $Apache::rankresponse::conceptgroup
		 && !&Apache::response::showallfoils() ) {
		push @{ $Apache::response::conceptgroup{'names'} }, $name;
		$Apache::response::conceptgroup{"$name.value"} = $value;
		$Apache::response::conceptgroup{"$name.text"} = $text;
		$Apache::response::conceptgroup{"$name.location"} = $location;
	    } else {
		push @{ $Apache::response::foilgroup{'names'} }, $name;
		$Apache::response::foilgroup{"$name.value"} = $value;
		$Apache::response::foilgroup{"$name.text"} = $text;
		$Apache::response::foilgroup{"$name.location"} = $location;
	    }
	}
    }
    if ($target eq 'edit') {
	$result.= &Apache::edit::tag_end($target,$token,'');
    }
    return $result;
}

sub insert_foil {
    return '
<foil name="" value="unused">
<startouttext />
<endouttext />
</foil>';
}
1;
__END__