Return to caparesponse.pm CVS log

Up to [LON-CAPA] / loncom / homework / caparesponse

- fixing display of numerical/formula/string respons types to make BUG#873 go away
- now longer says 'The correct answers is ...' but rather just puts the correct answer up there, and whenever it would display the computer's answer is says 'Computer's answer now show'

# The LearningOnline Network with CAPA
# caparesponse definition
#
# $Id: caparesponse.pm,v 1.146 2004/06/04 22:06:07 albertel 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/
#

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

BEGIN {
    &Apache::lonxml::register('Apache::caparesponse',('caparesponse','numericalresponse','stringresponse','formularesponse'));
}

sub start_numericalresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    my $id = &Apache::response::start_response($parstack,$safeeval);
    my $result;
    undef %{$safeeval->varglob('LONCAPA::CAPAresponse_args')};
    if ($target eq 'edit') {
	$result.=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::text_arg('Answer:','answer',$token);
	if ($token->[1] eq 'numericalresponse') {
	    $result.=&Apache::edit::text_arg('Incorrect Answers:','incorrect',
					     $token);
	    $result.=&Apache::edit::text_arg('Unit:','unit',$token,5).
		&Apache::loncommon::help_open_topic('Physical_Units');
	    $result.=&Apache::edit::text_arg('Format:','format',$token,4).
		&Apache::loncommon::help_open_topic('Numerical_Response_Format');
	} elsif ($token->[1] eq 'formularesponse') {
	    $result.=&Apache::edit::text_arg('Sample Points:','samples',
					     $token,40).
	      &Apache::loncommon::help_open_topic('Formula_Response_Sampling');
	}
	$result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
	my $constructtag;
	if ($token->[1] eq 'numericalresponse') {
	    $constructtag=&Apache::edit::get_new_args($token,$parstack,
						      $safeeval,'answer',
						      'incorrect','unit',
						      'format');
	} elsif ($token->[1] eq 'formularesponse') {
	    $constructtag=&Apache::edit::get_new_args($token,$parstack,
						      $safeeval,'answer',
						      'samples');
	}
	if ($constructtag) {
	    $result = &Apache::edit::rebuild_tag($token);
	    $result.=&Apache::edit::handle_insert();
	}
    } elsif ($target eq 'meta') {
	$result=&Apache::response::meta_package_write('numericalresponse');
    } elsif ($target eq 'answer' || $target eq 'grade') {
	&Apache::response::reset_params();
    } elsif ($target eq 'web') {
	my $partid = $Apache::inputtags::part;
	my $hideunit=&Apache::lonnet::EXT('resource.'.$partid.'_'.$id.'.turnoffunit');
	&Apache::lonxml::debug("Got unit $hideunit for $partid $id");
	#no way to enter units, with radio buttons
	if (lc($hideunit) eq "yes") {
	    my $unit=&Apache::lonxml::get_param_var('unit',$parstack,
						    $safeeval);
	    if ($unit =~ /\S/) { $result.=" (in $unit) "; }
	}
	if (  &Apache::response::show_answer() ) {
	    my $answertxt;
	    my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
							 $safeeval);
	    my (@formats)=&Apache::lonxml::get_param_var('format',$parstack,
							 $safeeval);
	    my $unit=&Apache::lonxml::get_param_var('unit',$parstack,
						    $safeeval);
	    for (my $i=0; $i <= $#answers; $i++) {
		my $answer=$answers[$i];
		my $format;
		if ($#formats > 0) {
		    $format=$formats[$i];
		} else {
		    $format=$formats[0];
		}
		my $formatted;
		if ((defined($format)) && ($format ne '')) {
		    $format=~s/e/E/g;
		    &Apache::lonxml::debug("formatting with :$format: answer :$answer:");
		    $formatted=sprintf('%.'.$format,$answer).',';
		} else {
		    &Apache::lonxml::debug("no format answer :$answer:");
		    $formatted="$answer,";
		}
		$answertxt.=$formatted;
	    }
	    chop $answertxt;
	    if ($target eq 'web') {
		$answertxt.=" $unit.<br />";
	    }
	    $Apache::inputtags::answertxt{$id}=$answertxt;
	}
    }
    return $result;
}

sub end_numericalresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $increment=1;
    my $result = '';
    if (!$Apache::lonxml::default_homework_loaded) {
	&Apache::lonxml::default_homework_load($safeeval);
    }
    my $tag;
    if (scalar(@$tagstack)) { $tag=$$tagstack[-1]; }
    if ( $target eq 'grade' && defined($ENV{'form.submitted'})) {
	&Apache::response::setup_params($tag,$safeeval);
	$safeeval->share_from('capa',['&caparesponse_capa_check_answer']);
	my $partid = $Apache::inputtags::part;
	my $id = $Apache::inputtags::response['-1'];
	if ($Apache::lonhomework::type eq 'exam' && 
	    $tag eq 'formularesponse') {
	    $increment=&Apache::response::scored_response($partid,$id);
	} else {
	    my $response = &Apache::response::getresponse();
	    if ( $response =~ /[^\s]/) {
		my $ad;
		my %previous = &Apache::response::check_for_previous($response,$partid,$id);
		&Apache::lonxml::debug("submitted a $response<br>\n");
		&Apache::lonxml::debug($$parstack[-1] . "\n<br>");
		
		if ($ENV{'form.submitted'} eq 'scantron') {
		    my $number_of_bubbles = &Apache::lonnet::EXT('resource.'.$partid.'_'.$id.'.numbubbles');
		    if (!$number_of_bubbles) { $number_of_bubbles=8; }
		    my (@formats)=&Apache::lonxml::get_param_var('format',$parstack,$safeeval);
		    my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
		    my (@incorrect)=&Apache::lonxml::get_param_var('incorrect',$parstack,$safeeval);
		    my @values=&make_numerical_bubbles($number_of_bubbles,$target,$answers[0],$formats[0],\@incorrect);
		    $response=$values[$response];
		}
		$Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
		my $args_ref= \%{$safeeval->varglob('LONCAPA::CAPAresponse_args')};
		$$args_ref{'response'}=$response;
		my $hideunit=&Apache::lonnet::EXT('resource.'.$partid.'_'.$id.'.turnoffunit');

		foreach my $arg ('type','tol','sig','ans_fmt','unit','calc',
				 'samples') {
		    $$args_ref{$arg}=
			&Apache::lonxml::get_param($arg,$parstack,$safeeval);
		}
		foreach my $key (keys(%Apache::inputtags::params)) {
		    $$args_ref{$key}=$Apache::inputtags::params{$key};
		}

		#no way to enter units, with radio buttons
		if ($Apache::lonhomework::type eq 'exam' ||
		    lc($hideunit) eq "yes") {
		    delete($$args_ref{'unit'});
		}
		#sig fig don't make much sense either
		if (($Apache::lonhomework::type eq 'exam' ||
		     $ENV{'form.submitted'} eq 'scantron') &&
		    $tag eq 'numericalresponse') {
		    delete($$args_ref{'sig'});
		}

		if ($tag eq 'formularesponse') {
		    $$args_ref{'type'}='fml';
		} elsif ($tag eq 'numericalresponse') {
		    $$args_ref{'type'}='float';
		}
		my @answer=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
		&Apache::lonxml::debug('answer is'.join(':',@answer));
		@{$safeeval->varglob('LONCAPA::CAPAresponse_answer')}=@answer;
		
		($result,my @msgs) = 
		    &Apache::run::run("&caparesponse_check_list()",$safeeval);
		&Apache::lonxml::debug('msgs are'.join(':',@msgs));
		my ($awards)=split(/:/,$result);
		my (@awards) = split(/,/,$awards);
		($ad,my $msg) = &Apache::inputtags::finalizeawards(\@awards,\@msgs);
		&Apache::lonxml::debug('ad is'.$ad);
		if ($ad eq 'SIG_FAIL') {
		    my ($sig_u,$sig_l)=
			&get_sigrange($Apache::inputtags::params{'sig'});
		    $msg=join(':',$msg,$sig_l,$sig_u);
		    &Apache::lonxml::debug("sigs bad $sig_u $sig_l ".
					   $Apache::inputtags::params{'sig'});
		}
		&Apache::lonxml::debug("\n<br>result:$result:$Apache::lonxml::curdepth<br>\n");
		&Apache::response::handle_previous(\%previous,$ad);
		$Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
		$Apache::lonhomework::results{"resource.$partid.$id.awardmsg"}=$msg;
		$result='';
	    }
	}
    } elsif ($target eq 'web' || $target eq 'tex') {
	my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
						     $safeeval);
	my $award = $Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
	my $status = $Apache::inputtags::status['-1'];
	if ($Apache::lonhomework::type eq 'exam') {
	    my $partid=$Apache::inputtags::part;
	    my $id=$Apache::inputtags::response[-1];
	    my $number_of_bubbles = &Apache::lonnet::EXT('resource.'.$partid.'_'.$id.'.numbubbles');
	    if ($Apache::inputtags::params{'numbubbles'}) {
		$number_of_bubbles = $Apache::inputtags::params{'numbubbles'};
	    }
	    if (!$number_of_bubbles) { $number_of_bubbles=8; }
	    
	    my (@formats)=&Apache::lonxml::get_param_var('format',$parstack,
							 $safeeval);
	    my $unit=&Apache::lonxml::get_param_var('unit',$parstack,
						    $safeeval);
	    my (@incorrect)=&Apache::lonxml::get_param_var('incorrect',$parstack,$safeeval);
	    my @bubble_values=&make_numerical_bubbles($number_of_bubbles,
						      $target,$answers[0],
						      $formats[0],\@incorrect);
	    my @alphabet=('A'..'Z');
	    if ($target eq 'web') {
		if ($tag eq 'numericalresponse') {
		    if ($unit=~/\S/) {$result.=' (in '.$unit.')<br /><br />';}
		    $result.= '<table border="1"><tr>';
		    my $previous=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.$id.submission"};
		    for (my $ind=0;$ind<$number_of_bubbles;$ind++) {
			my $checked='';
			if ($previous eq $bubble_values[$ind]) {
			    $checked=" checked='on' ";
			}
			$result.='<td><input type="radio" name="HWVAL_'.$id.
			    '" value="'.$bubble_values[$ind].'" '.$checked
			    .' /><b>'.$alphabet[$ind].'</b>: '.
			    $bubble_values[$ind].'</td>';
		    }
		    $result.='</tr></table>';
		} elsif ($tag eq 'formularesponse') {
		    $result.= '<br /><br /><font color="red">
                           <textarea name="HWVAL_'.$id.'" rows="4" cols="50">
                           </textarea></font> <br /><br />';
		}
	    } elsif ($target eq 'tex') {
		if ((defined $unit) and ($unit=~/\S/) and ($Apache::lonhomework::type eq 'exam')) {
		    $result.=' \textit{(in} \verb|'.$unit.'|\textit{)} ';
		}
		if ($tag eq 'numericalresponse') {
		    my ($celllength,$number_of_tables,@table_range)=
			&get_table_sizes($number_of_bubbles,\@bubble_values);
		    my $j=0;
		    my $cou=0;
		    $result.='\vskip -1 mm \noindent \begin{enumerate}\item[\textbf{'.$Apache::lonxml::counter.'}.]';
		    for (my $i=0;$i<$number_of_tables;$i++) {
			$result.='\vskip -1 mm \noindent \setlength{\tabcolsep}{2 mm}\begin{tabular}{';
			for (my $ind=0;$ind<$table_range[$j];$ind++) {
			    $result.='p{3 mm}p{'.$celllength.' mm}';
			}
			$result.='}';
			for (my $ind=$cou;$ind<$cou+$table_range[$j];$ind++) {
			    $result.='\hskip -4 mm {\small \textbf{'.$alphabet[$ind].'}}$\bigcirc$ & \hskip -3 mm {\small '.$bubble_values[$ind].'} ';
			    if ($ind != $cou+$table_range[$j]-1) {$result.=' & ';}
			}
			$cou += $table_range[$j];
			$j++;
			$result.='\\\\\end{tabular}\vskip 0 mm ';
		    }
		    $result.='\end{enumerate}';
		} else {
		    $result.='\fbox{\fbox{\parbox{\textwidth-5mm}{\strut\\\\\strut\\\\\strut\\\\\strut\\\\}}}';
		    my $repetition = &Apache::response::repetition();
		    $result.='\begin{enumerate}';
		    for (my $i=0;$i<$repetition;$i++) {
			$result.='\item[\textbf{'.($Apache::lonxml::counter+$i).'}.]\textit{Leave blank on scoring form}\vskip 0 mm';
		    }
		    $increment=$repetition;
		    $result.= '\end{enumerate}';
		}
	    }
	}
    } elsif ($target eq 'edit') {
	$result.='</td></tr>'.&Apache::edit::end_table;
    } elsif ($target eq 'answer' || $target eq 'analyze') {
	
	my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
	if ($target eq 'analyze') {
	    push (@{ $Apache::lonhomework::analyze{"parts"} },$part_id);
	    $Apache::lonhomework::analyze{"$part_id.type"} = $tag;
	    my (@incorrect)=&Apache::lonxml::get_param_var('incorrect',$parstack,$safeeval);
	    push (@{ $Apache::lonhomework::analyze{"$part_id.incorrect"} }, @incorrect);
	}
	if (scalar(@$tagstack)) {
	    &Apache::response::setup_params($tag,$safeeval);
	}
	my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
	my (@formats)=&Apache::lonxml::get_param_var('format',$parstack,$safeeval);
	my $unit=&Apache::lonxml::get_param_var('unit',$parstack,$safeeval);
	my $type=&Apache::lonxml::get_param('type',$parstack,$safeeval);
	
	if ($target eq 'answer') {
	    $result.=&Apache::response::answer_header($tag);
	}
	for(my $i=0;$i<=$#answers;$i++) {
	    my $ans=$answers[$i];
	    my $fmt=$formats[0];
	    if (@formats && $#formats) {$fmt=$formats[$i];}
	    my ($high,$low);
	    if ($Apache::inputtags::params{'tol'}) {
		($high,$low)=&get_tolrange($ans,$Apache::inputtags::params{'tol'});
	    }
	    my ($sighigh,$siglow);
	    if ($Apache::inputtags::params{'sig'}) {
		($sighigh,$siglow)=&get_sigrange($Apache::inputtags::params{'sig'});
	    }
	    if ($fmt && $tag eq 'numericalresponse') {
		$fmt=~s/e/E/g;
		$ans = sprintf('%.'.$fmt,$ans);
		if ($high) {
		    $high=sprintf('%.'.$fmt,$high);
		    $low =sprintf('%.'.$fmt,$low);
		}
	    }
	    if ($target eq 'answer') {
		if ($high && $tag eq 'numericalresponse') { $ans.=' ['.$low.','.$high.']'; }
		if (defined($sighigh) && $tag eq 'numericalresponse') {
		    if ($ENV{'form.answer_output_mode'} eq 'tex') {
			$ans.= " Sig $siglow - $sighigh";
		    } else {
			$ans.= " Sig <i>$siglow - $sighigh</i>";
		    }
		}
		$result.=&Apache::response::answer_part($tag,$ans);
	    } elsif ($target eq 'analyze') {
		push (@{ $Apache::lonhomework::analyze{"$part_id.answer"} }, $ans);
		if ($high) {
		    push (@{ $Apache::lonhomework::analyze{"$part_id.ans_high"} }, $high);
		    push (@{ $Apache::lonhomework::analyze{"$part_id.ans_low"} }, $low);
		}
	    }
	}
	if (defined($unit) and ($unit ne '') and
	    $tag eq 'numericalresponse') {
	    if ($target eq 'answer') {
		if ($ENV{'form.answer_output_mode'} eq 'tex') {
		    $result.=&Apache::response::answer_part($tag,
							    " Unit: $unit ");
		} else {
		    $result.=&Apache::response::answer_part($tag,
							    "Unit: <b>$unit</b>");
		}
	    } elsif ($target eq 'analyze') {
		push (@{ $Apache::lonhomework::analyze{"$part_id.unit"} }, $unit);
	    }
	}
	if ($tag eq 'formularesponse' && $target eq 'answer') {
	    my $samples=&Apache::lonxml::get_param('samples',$parstack,$safeeval);
	    $result.=&Apache::response::answer_part($tag,$samples);
	}
	if ($target eq 'answer') {
	    $result.=&Apache::response::answer_footer($tag);
	}
    }
    if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || 
	$target eq 'tex' || $target eq 'analyze') {
	&Apache::lonxml::increment_counter($increment);
    }
    &Apache::response::end_response;
    return $result;
}

sub get_table_sizes {
    my ($number_of_bubbles,$rbubble_values)=@_;
    my $scale=2; #mm for one digit
    my $cell_width=0;
    foreach my $member (@$rbubble_values) {
	my $cell_width_real=0;
	if ($member=~/(\+|-)?(\d*)\.?(\d*)\s*\$\\times\s*10\^{(\+|-)?(\d+)}\$/) {
	    $cell_width_real=(length($2)+length($3)+length($5)+7)*$scale;
	} elsif ($member=~/(\d*)\.?(\d*)(E|e)(\+|-)?(\d*)/) {
	    $cell_width_real=(length($1)+length($2)+length($5)+9)*$scale;
        } elsif ($member=~/(\d*)\.(\d*)/) {
	    $cell_width_real=(length($1)+length($2)+3)*$scale;
	} else {
	    $cell_width_real=(length($member)+1)*$scale*0.9;
	}
	if ($cell_width_real>$cell_width) {$cell_width=$cell_width_real;}
    }
    $cell_width+=8; 
    my $textwidth;
    if ($ENV{'form.textwidth'} ne '') {
	$ENV{'form.textwidth'}=~/(\d*)\.?(\d*)/;
	$textwidth=$1.'.'.$2;
    } else {
	$ENV{'textwidth'}=~/(\d+)\.?(\d*)/;
	$textwidth=$1.'.'.$2;
    }
    my $bubbles_per_line=int($textwidth/$cell_width);
    if (($bubbles_per_line > $number_of_bubbles/2) && ($number_of_bubbles % 2==0)) {$bubbles_per_line=$number_of_bubbles/2;}
    my $number_of_tables = int($number_of_bubbles/$bubbles_per_line);
    my @table_range = ();
    for (my $i=0;$i<$number_of_tables;$i++) {push @table_range,$bubbles_per_line;}
    if ($number_of_bubbles % $bubbles_per_line) {
	$number_of_tables++;
	push @table_range,($number_of_bubbles % $bubbles_per_line);
    }
    $cell_width-=8;
    $cell_width=$cell_width*3/4;
    return ($cell_width,$number_of_tables,@table_range);
}

sub format_number {
    my ($number,$format,$target)=@_;
    my $ans;
    if ($format ne '') {
	$format=~s/e/E/g;
	$ans = sprintf('%.'.$format,$number);
    } else {
	my $format = '';
	#What is the number? (integer,decimal,floating point)
	if ($number=~/^(\d*\.?\d*)(E|e)(\d*)$/) {
	    $format = '3e';
	} elsif ($number=~/^(\d*)\.(\d*)$/) {
	    $format = '4f';
	} elsif ($number=~/^(\d*)$/) {
	    $format = 'd';
	}
	$ans = sprintf('%.'.$format,$number);
    }
    if ($target eq 'tex') {
	if ($ans =~ m/([0-9\.\-\+]+)E([0-9\-\+]+)/ ) {
	    my $number = $1;
	    my $power = $2;
	    $power=~s/^\+//;
	    $power=~s/^(-?)0+(\d+)/$1$2/;
	    $ans=$number.'$\times 10^{'.$power.'}$'; #'stupidemacs
	}
    }
    return $ans;
}

sub make_numerical_bubbles {
    my ($number_of_bubbles,$target,$answer,$format,$incorrect) =@_;
    my @bubble_values = ();
    &Apache::lonxml::debug("answer is $answer incorrect is $incorrect");
    my @oldseed=&Math::Random::random_get_seed();
    if (defined($incorrect) && ref($incorrect)) {
	&Apache::lonxml::debug("inside ".(scalar(@$incorrect)+1 gt $number_of_bubbles));
	if (defined($$incorrect[0]) &&
	    scalar(@$incorrect)+1 >= $number_of_bubbles) {
	    &Apache::lonxml::debug("inside ".(scalar(@$incorrect)+1).":$number_of_bubbles");
	    &Apache::response::setrandomnumber();
	    my @rand_inc=&Math::Random::random_permutation(@$incorrect);
	    @bubble_values=@rand_inc[0..($number_of_bubbles-2)];
	    @bubble_values=sort {$a <=> $b} (@bubble_values,$answer);
	    &Apache::lonxml::debug("Answer was :$answer: returning :".$#bubble_values.": whih are :".join(':',@bubble_values));
	    &Math::Random::random_set_seed(@oldseed);
	    if (defined($format) && $format ne '') {
		foreach my $value (@bubble_values) {
		    $value=&format_number($value,$format,$target);
		}
	    }
	    return @bubble_values;
	}
	if (defined($$incorrect[0]) &&
	    scalar(@$incorrect)+1 < $number_of_bubbles) {
	    &Apache::lonxml::warning("Not enough incorrect answers were specified in the incorrect array, ignoring the specified incorrect answers and instead generating them.");
	}
    }
    my @factors = (1.13,1.17,1.25,1.33,1.45); #default values of factors
    my @powers = (1..$number_of_bubbles);
    &Apache::response::setrandomnumber();
    my $ind=&Math::Random::random_uniform_integer(1,0,$#powers);
    my $power = $powers[$ind];
    $ind=&Math::Random::random_uniform_integer(1,0,$#factors);
    my $factor = $factors[$ind];
    for ($ind=0;$ind<$number_of_bubbles;$ind++) {
	$bubble_values[$ind] = $answer*($factor**($power-$powers[$#powers-$ind]));
	$bubble_values[$ind] = &format_number($bubble_values[$ind],
					       $format,$target);

    }
    &Math::Random::random_set_seed(@oldseed);
    return @bubble_values;
}

sub get_tolrange {
    my ($ans,$tol)=@_;
    my ($high,$low);
    if ($tol =~ /%$/) {
	chop($tol);
	my $change=$ans*($tol/100.0);
	$high=$ans+$change;
	$low=$ans-$change;
    } else {
	$high=$ans+$tol;
	$low=$ans-$tol;
    }
    return ($high,$low);
}

sub get_sigrange {
    my ($sig)=@_;
    &Apache::lonxml::debug("Got a sig of :$sig:");
    my $sig_lbound;
    my $sig_ubound;
    if ($sig eq '') {
	$sig_lbound = 0; #SIG_LB_DEFAULT
	$sig_ubound =15; #SIG_UB_DEFAULT
    } else {
	($sig_lbound,$sig_ubound) = split(/,/,$sig);
	if (!defined($sig_lbound)) {
	    $sig_lbound = 0; #SIG_LB_DEFAULT
	    $sig_ubound =15; #SIG_UB_DEFAULT
	}
	if (!defined($sig_ubound)) { $sig_ubound=$sig_lbound; }
    }
    if (($sig_ubound<$sig_lbound) ||
	($sig_lbound > 15) ||
	($sig =~/(\+|-)/ ) ) {
	my $errormsg=&mt("Invalid Significant figures detected")." ($sig)";
	if ($ENV{'request.state'} eq 'construct') {
	    $errormsg.=
		&Apache::loncommon::help_open_topic('Significant_Figures');
	}
	&Apache::lonxml::error($errormsg);
    }
    return ($sig_ubound,$sig_lbound);
}

sub start_stringresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    my $id = &Apache::response::start_response($parstack,$safeeval);
    if ($target eq 'meta') {
	&Apache::response::start_response($parstack,$safeeval);
	$result=&Apache::response::meta_package_write('stringresponse');
	&Apache::response::end_response();
    } elsif ($target eq 'edit') {
	$result.=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::text_arg('Answer:','answer',$token);
	$result.=&Apache::edit::select_arg('Type:','type',
			 [['cs','Case Sensitive'],['ci','Case Insensitive'],
			  ['mc','Case Insensitive, Any Order'],
			  ['re','Regular Expression']],$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,
						  $safeeval,'answer',
						  'type','answerdisplay');
	if ($constructtag) {
	    $result = &Apache::edit::rebuild_tag($token);
	    $result.=&Apache::edit::handle_insert();
	}
    } elsif ($target eq 'web') {
	if (  &Apache::response::show_answer() ) {
	    $Apache::inputtags::answertxt{$id}=
		&Apache::lonxml::get_param('answer',$parstack,$safeeval);
	} 
    } elsif ($target eq 'answer' || $target eq 'grade') {
	&Apache::response::reset_params();
    }
    return $result;
}

sub end_stringresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $increment=1;
    my $result = '';
    my $part=$Apache::inputtags::part;
    my $id=$Apache::inputtags::response[-1];
    my $answer=&Apache::lonxml::get_param('answer',$parstack,$safeeval);
    my $type=&Apache::lonxml::get_param('type',$parstack,$safeeval);
    my $answerdisplay=&Apache::lonxml::get_param('answerdisplay',$parstack,$safeeval);
    &Apache::lonxml::debug("current $answer ".$token->[2]);
    if (!$Apache::lonxml::default_homework_loaded) {
	&Apache::lonxml::default_homework_load($safeeval);
    }
    if ( $target eq 'grade' && defined($ENV{'form.submitted'})) {
	&Apache::response::setup_params('stringresponse',$safeeval);
	$safeeval->share_from('capa',['&caparesponse_capa_check_answer']);
	if ($Apache::lonhomework::type eq 'exam' ||
	    $ENV{'form.submitted'} eq 'scantron') {
	    $increment=&Apache::response::scored_response($part,$id);
	} else {
	    my $response = &Apache::response::getresponse();
	    if ( $response =~ /[^\s]/) {
		my %previous = &Apache::response::check_for_previous($response,
								    $part,$id);
		&Apache::lonxml::debug("submitted a $response<br>\n");
		&Apache::lonxml::debug($$parstack[-1] . "\n<br>");
		$Apache::lonhomework::results{"resource.$part.$id.submission"}=
		    $response;
		my ($ad,$msg);
		if ($type eq 're' ) { 
		    # if the RE wasn't in a var it likely got munged,
                    # thus grab it from the var directly
#		    my $testans=$token->[2]->{'answer'};
#		    if ($testans !~ m/^\s*\$/) {
#			$answer=$token->[2]->{'answer'};
#		    }
		    ${$safeeval->varglob('LONCAPA::response')}=$response;
		    $result = &Apache::run::run('return $LONCAPA::response=~m'.$answer,$safeeval);
		    &Apache::lonxml::debug("current $response");
		    &Apache::lonxml::debug("current $answer");
		    $ad = ($result) ? 'APPROX_ANS' : 'INCORRECT';
		} else {
		    my $args_ref= 
			\%{$safeeval->varglob('LONCAPA::CAPAresponse_args')};
		
		    $$args_ref{'response'}=$response;
		    &Apache::lonxml::debug("current $response");
		    $$args_ref{'type'}=
			&Apache::lonxml::get_param('type',$parstack,$safeeval);
		    foreach my $key (keys(%Apache::inputtags::params)) {
			$$args_ref{$key}=$Apache::inputtags::params{$key};
		    }
		    &Apache::lonxml::debug('answer is'.join(':',$answer));
		    @{$safeeval->varglob('LONCAPA::CAPAresponse_answer')}=($answer);
		    ($result, my @msgs)=&Apache::run::run("&caparesponse_check_list()",$safeeval);
		    &Apache::lonxml::debug('msgs are'.join(':',@msgs));
		    my ($awards)=split(/:/,$result);
		    my (@awards) = split(/,/,$awards);
		    ($ad,$msg) = &Apache::inputtags::finalizeawards(\@awards,\@msgs);
		    &Apache::lonxml::debug("\n<br>result:$result:$Apache::lonxml::curdepth<br>\n");
		}
		&Apache::response::handle_previous(\%previous,$ad);
		$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$ad;
		$Apache::lonhomework::results{"resource.$part.$id.awardmsg"}=$msg;
	    }
	}
    } elsif ($target eq 'web' || $target eq 'tex') {
	my $award = $Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
	my $status = $Apache::inputtags::status['-1'];
	if ($Apache::lonhomework::type eq 'exam' && $target eq 'tex') {
	    $result.='\fbox{\fbox{\parbox{\textwidth-5mm}{\strut\\\\\strut\\\\\strut\\\\\strut\\\\}}}';
	    $increment = &Apache::response::repetition();
	    $result.='\begin{enumerate}';
	    for (my $i=0;$i<$increment;$i++) {
		$result.='\item[\textbf{'.($Apache::lonxml::counter+$i).
		    '}.]\textit{Leave blank on scoring form}\vskip 0 mm';
	    }
	    $result.= '\end{enumerate}';
	}
    } elsif ($target eq 'answer' || $target eq 'analyze') {
	if ($target eq 'analyze') {
	    push (@{ $Apache::lonhomework::analyze{"parts"} },"$part.$id");
	    $Apache::lonhomework::analyze{"$part.$id.type"} = 'stringresponse';
	}
	&Apache::response::setup_params('stringresponse',$safeeval);
	if ($target eq 'answer') {
	    $result.=&Apache::response::answer_header('stringresponse');
	}
#	foreach my $ans (@answers) {
	    if ($target eq 'answer') {
		$result.=&Apache::response::answer_part('stringresponse',$answer);
	    } elsif ($target eq 'analyze') {
		push (@{ $Apache::lonhomework::analyze{"$part.$id.answer"} },
		      $answer);
	    }
#	}
	my $string='Case Insensitive';
	if ($type eq 'mc') {
	    $string='Multiple Choice';
	} elsif ($type eq 'cs') {
	    $string='Case Sensitive';
	} elsif ($type eq 'ci') {
	    $string='Case Insensitive';
	} elsif ($type eq 're') {
	    $string='Regular Expression';
	}
	if ($target eq 'answer') {
	    if ($ENV{'form.answer_output_mode'} eq 'tex') {
		$result.=&Apache::response::answer_part('stringresponse',
							"$string");
	    } else {
		$result.=&Apache::response::answer_part('stringresponse',
							"<b>$string</b>");
	    }
	} elsif ($target eq 'analyze') {
	    push (@{$Apache::lonhomework::analyze{"$part.$id.str_type"}},
		  $type);
	}
	if ($target eq 'answer') {
	    $result.=&Apache::response::answer_footer('stringresponse');
	}
    } elsif ($target eq 'edit') {
	$result.='</td></tr>'.&Apache::edit::end_table;
    }
    if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || 
	$target eq 'tex' || $target eq 'analyze') {
	&Apache::lonxml::increment_counter($increment);
    }
    &Apache::response::end_response;
    return $result;
}

sub start_formularesponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'meta') {
	&Apache::response::start_response($parstack,$safeeval);
	$result=&Apache::response::meta_package_write('formularesponse');
	&Apache::response::end_response();
    } else {
	$result.=&start_numericalresponse(@_);
    }
    return $result;
}

sub end_formularesponse {
    return end_numericalresponse(@_);
}

1;
__END__