--- loncom/homework/response.pm	2006/01/21 08:17:51	1.135
+++ loncom/homework/response.pm	2008/11/25 13:16:17	1.208
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # various response type definitons response definition
 #
-# $Id: response.pm,v 1.135 2006/01/21 08:17:51 albertel Exp $
+# $Id: response.pm,v 1.208 2008/11/25 13:16:17 jms Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -26,19 +26,42 @@
 # http://www.lon-capa.org/
 #
 
+=pod
+
+=head1 NAME
+
+Apache::resonse.pm
+
+=head1 SYNOPSIS
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+
+=head1 NOTABLE SUBROUTINES
+
+=over
+
+=item 
+
+=back
+
+=cut
+
+
 package Apache::response;
 use strict;
 use Apache::lonlocal;
 use Apache::lonnet;
+use Apache::lonmaxima();
 
 BEGIN {
-    &Apache::lonxml::register('Apache::response',('responseparam','parameter','dataresponse','customresponse'));
+    &Apache::lonxml::register('Apache::response',('responseparam','parameter','dataresponse','customresponse','mathresponse'));
 }
 
 sub start_response {
     my ($parstack,$safeeval)=@_;
-    my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
-    if ($id eq '') { $id = $Apache::lonxml::curdepth; }
+    my $id = &Apache::lonxml::get_id($parstack,$safeeval);
     if ($#Apache::inputtags::import > -1) {
 	&Apache::lonxml::debug("Turning :$id: into");
 	$id = join('_',@Apache::inputtags::import).'_'.$id;
@@ -69,8 +92,7 @@ sub end_response {
 
 sub start_hintresponse {
     my ($parstack,$safeeval)=@_;
-    my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
-    if ($id eq '') { $id = $Apache::lonxml::curdepth; }
+    my $id = &Apache::lonxml::get_id($parstack,$safeeval);
     push (@Apache::inputtags::hint,$id);
     push (@Apache::inputtags::hintlist,$id);
     push (@Apache::inputtags::paramstack,[%Apache::inputtags::params]);
@@ -130,11 +152,13 @@ sub setrandomnumber {
 	}
 	$shift_amt=scalar(@Apache::inputtags::responselist);
     } elsif ($Apache::lonhomework::parsing_a_task) {
-	$id1=$Apache::bridgetask::dimension;
-	if (!$ignore_id2 && defined($Apache::bridgetask::instance[-1])) {
-	    $id2=$Apache::bridgetask::instance[-1];
+	$id1=&Apache::bridgetask::get_dim_id();
+	if (!$ignore_id2 && ref($Apache::bridgetask::instance{$id1})) {
+	    $id2=$Apache::bridgetask::instance{$id1}[-1];
+	    $shift_amt=scalar(@{$Apache::bridgetask::instance{$id1}});
+	} else {
+	    $shift_amt=0;
 	}
-	$shift_amt=scalar(@Apache::bridgetask::instance);
     } 
     &Apache::lonxml::debug("id1: $id1, id2: $id2, shift_amt: $shift_amt");
     if (!$rand_alg || $rand_alg eq '32bit' || $rand_alg eq '64bit' ||
@@ -216,23 +240,26 @@ sub meta_stores_write {
 }
 
 sub mandatory_part_meta {
-#
-# Autogenerate metadata for mandatory
-# input (from RAT or lonparmset) and 
-# output (to lonspreadsheet)
-# of each part
+=pod
+
+=item meta_part_order
+
+Autogenerate metadata for mandatory
+input (from RAT or lonparmset) and 
+output (to lonspreadsheet)
+of each part
 #
     return
-#    &meta_parameter_write('opendate','date_start','',
-#                          'Opening Date').
-#    &meta_parameter_write('duedate','date_end','',
-#                          'Due Date').
-#    &meta_parameter_write('answerdate','date_start','',
-#                          'Show Answer Date').
-#    &meta_parameter_write('weight','int_zeropos','',
-#                          'Available Points').
-#    &meta_parameter_write('maxtries','int_pos','',
-#                          'Maximum Number of Tries').
+   &meta_parameter_write('opendate','date_start','',
+                         'Opening Date').
+   &meta_parameter_write('duedate','date_end','',
+                         'Due Date').
+   &meta_parameter_write('answerdate','date_start','',
+                         'Show Answer Date').
+   &meta_parameter_write('weight','int_zeropos','',
+                         'Available Points').
+   &meta_parameter_write('maxtries','int_pos','',
+                         'Maximum Number of Tries').
 	&meta_package_write('part').
         &meta_stores_write('solved','string',
 			   'Problem Status').
@@ -240,10 +267,12 @@ sub mandatory_part_meta {
 			   'Number of Attempts').
         &meta_stores_write('awarded','float',
 			   'Partial Credit Factor');
-#
-# Note: responseid-specific data 'submission' and 'awarddetail'
-# not available to spreadsheet -> skip here
-#
+
+Note: responseid-specific data 'submission' and 'awarddetail'
+not available to spreadsheet -> skip here
+
+=cut
+
 }
 
 sub meta_part_order {
@@ -264,11 +293,14 @@ sub meta_response_order {
 }
 
 sub check_for_previous {
-    my ($curresponse,$partid,$id) = @_;
+    my ($curresponse,$partid,$id,$last) = @_;
     my %previous;
     $previous{'used'} = 0;
     foreach my $key (sort(keys(%Apache::lonhomework::history))) {
 	if ($key =~ /resource\.$partid\.$id\.submission$/) {
+	    if ( $last && $key =~ /^(\d+):/ ) {
+		next if ($1 >= $last);
+	    }
 	    &Apache::lonxml::debug("Trying $key");
 	    my $pastresponse=$Apache::lonhomework::history{$key};
 	    if ($pastresponse eq $curresponse) {
@@ -306,7 +338,7 @@ sub handle_previous {
 }
 
 sub view_or_modify {
-    my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+    my ($symb,$courseid,$domain,$name) = &Apache::lonnet::whichuser();
     my $myself=0;
     if ( ($name eq $env{'user.name'}) && ($domain eq $env{'user.domain'}) ) {
 	$myself=1;
@@ -340,7 +372,7 @@ sub end_dataresponse {
     if ( $target eq 'web' ) {
     } elsif ($target eq 'grade' ) {
 	if ( defined $env{'form.submitted'}) {
-	    my ($symb,$courseid,$domain,$name)=&Apache::lonxml::whichuser();
+	    my ($symb,$courseid,$domain,$name)=&Apache::lonnet::whichuser();
 	    my $allowed=&Apache::lonnet::allowed('mgr',$courseid);
 	    if ($allowed) {
 		&Apache::response::setup_params('dataresponse',$safeeval);
@@ -367,13 +399,14 @@ sub start_customresponse {
     my $id = &Apache::response::start_response($parstack,$safeeval);
     push(@Apache::lonxml::namespace,'customresponse');
     my $result;
-    undef($Apache::response::custom_answer);
+    @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;
+	    $Apache::inputtags::answertxt{$id}=[$answer];
 	}
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_start($target,$token);
@@ -386,7 +419,6 @@ sub start_customresponse {
 						  $safeeval,'answerdisplay');
 	if ($constructtag) {
 	    $result = &Apache::edit::rebuild_tag($token);
-	    $result.=&Apache::edit::handle_insert();
 	}
     } elsif ($target eq 'answer' || $target eq 'grade') {
 	&Apache::response::reset_params();
@@ -403,8 +435,11 @@ sub end_customresponse {
     my $id=$Apache::inputtags::response[-1];
     if ( $target eq 'grade' && &Apache::response::submitted() ) {
 	my $response = &Apache::response::getresponse();
-	if ( $response =~ /[^\s]/ && 
-	     $Apache::response::custom_answer_type eq 'loncapa/perl') {
+	if ($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);
 	    }
@@ -416,7 +451,7 @@ sub end_customresponse {
 	    ${$safeeval->varglob('LONCAPA::customresponse_submission')}=
 		$response;
 	    
-	    my $award = &Apache::run::run('{ my $submission=$LONCAPA::customresponse_submission;'.$Apache::response::custom_answer.'}',$safeeval);
+	    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';
@@ -429,25 +464,199 @@ sub end_customresponse {
 		    $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' || $target eq 'analyze') {
+	&Apache::lonxml::increment_counter(&Apache::response::repetition(),
+					   "$part.$id");
+	if ($target eq 'analyze') {
+            $Apache::lonhomework::analyze{"$part.$id.type"} = 'customresponse';
+	    &Apache::lonhomework::set_bubble_lines();
+	}
     }
     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 format_prior_response_custom {
+    my ($mode,$answer) =@_;
+    return '<span class="LC_prior_custom">'.
+	    &HTML::Entities::encode($answer,'"<>&').'</span>';
+}
+
+sub start_mathresponse {
+    my ($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).
+                 &Apache::loncommon::help_open_topic('Maxima_Argument_Array');
+        $result.=&Apache::edit::text_arg('Libraries:',
+                                         'libraries',$token).
+                 &Apache::loncommon::help_open_topic('Maxima_Libraries');
+	$result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+    } elsif ($target eq 'modified') {
+	my $constructtag;
+	$constructtag=&Apache::edit::get_new_args($token,$parstack,
+						  $safeeval,'answerdisplay','cas','args','libraries');
+	if ($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 $result;
+}
+
+sub edit_mathresponse_button {
+    my ($id,$field)=@_;
+    my $button=&mt('Edit Answer');
+#    my $helplink=&Apache::loncommon::help_open_topic('Formula_Editor');
+    my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
+    return(<<ENDFORMULABUTTON);
+<script language="JavaScript">
+function edit_${id}_${field} (textarea) {
+    thenumber = textarea;
+    thedata = document.forms['lonhomework'].elements[textarea].value;
+    newwin = window.open("/adm/dragmath/applet/MaximaPopup.html","","width=565,height=400,resizable");
+}
+</script>
+<a href="javascript:edit_${id}_${field}('${field}');void(0);"><img class="stift" src='$iconpath/stift.gif' alt='$button' title='$button'/></a>
+ENDFORMULABUTTON
+}
+
+sub end_mathresponse {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $result;
+    my $part=$Apache::inputtags::part;
+    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,
+                                                      &Apache::lonxml::get_param('libraries',$parstack,$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"}=
+		    $error;
+	    }
+	}
+    }
+    if ($target eq 'web') {
+	&setup_prior_tries_hash(\&format_prior_response_math);
+        my $partid = $Apache::inputtags::part;
+        my $id = $Apache::inputtags::response[-1];
+        if (($Apache::inputtags::status['-1'] eq 'CAN_ANSWER')
+           && (&Apache::lonnet::EXT('resource.'.$partid.'_'.$id.'.turnoffeditor') ne 'yes')) {
+            $result.=&edit_mathresponse_button($id,"HWVAL_$id");
+        }
+    }
+
+    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 $result;
+}
+
+sub format_prior_response_math {
+    my ($mode,$answer) =@_;
+    return '<span class="LC_prior_math">'.
+	    &HTML::Entities::encode($answer,'"<>&').'</span>';
+}
+
+sub implicit_multiplication {
+    my ($expression)=@_;
+# Escape scientific notation, so 3e8 does not become 3*e*8
+# 3e8 -> 3&8; 3e-8 -> 3&-8; 3E+8 -> e&+8
+    $expression=~s/(\d+)e([\+\-]*\d+)/$1\&\($2\)/gsi;
+# 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/([A-Za-z0-9])\s+(?=[A-Za-z0-9])/$1\*/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/([A-Za-z0-9])\s+\(/$1\*\(/gs;
+# )a -> )*a; )3 -> )*3; ) 3 -> )*3
+    $expression=~s/\)\s*([A-Za-z0-9])/\)\*$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;
-    $Apache::response::custom_answer=
-	&Apache::lonxml::get_all_text_unbalanced("/answer",$parser);
-    $Apache::response::custom_answer_type=
-	lc(&Apache::lonxml::get_param('type',$parstack,$safeeval));
-    $Apache::response::custom_answer_type =~ s/\s+//g;
+    push(@Apache::response::custom_answer,
+	&Apache::lonxml::get_all_text_unbalanced("/answer",$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,
+					  $Apache::response::custom_answer[-1],
 					  '',80,4);
     } elsif ( $target eq "modified" ) {
 	$result=$token->[4].&Apache::edit::modifiedfield('/answer',$parser);
@@ -499,7 +708,7 @@ sub start_responseparam {
 	    }
 	}
 	if (defined($optionlist)) {
-	    $result.='Use template: <select name="'.
+	    $result.=&mt('Use template:').' <select name="'.
 		&Apache::edit::html_element_name('parameter_package').'">'.
 		    '<option value=""></option>'.$optionlist.'</select><br />';
 	}
@@ -524,11 +733,11 @@ sub start_responseparam {
 		$Apache::lonnet::packagetab{"$tag&$name&display"};
 	    $token->[2]->{'default'}=
 		$Apache::lonnet::packagetab{"$tag&$name&default"};
+            $token->[3] = ['name','type','description','default'];
 	    $constructtag=1;
 	}
 	if ($constructtag) {
 	    $result = &Apache::edit::rebuild_tag($token);
-	    $result.=&Apache::edit::handle_insert();
 	}
     } elsif ($target eq 'grade' || $target eq 'answer' || $target eq 'web' ||
 	     $target eq 'tex' || $target eq 'analyze' ) {
@@ -566,7 +775,7 @@ sub setup_params {
     if ($env{'request.state'} eq 'construct') { return; }
     my %paramlist=();
     foreach my $key (keys(%Apache::lonnet::packagetab)) {
-	if ($key =~ /^$tag/) {
+	if ($key =~ /^\Q$tag\E/) {
 	    my ($package,$name) = split(/&/,$key);
 	    $paramlist{$name}=1;
 	}
@@ -594,9 +803,10 @@ sub setup_params {
 
 {
     my @answer_bits;
+    my $need_row_start;
 
 sub answer_header {
-    my ($type,$increment) = @_;
+    my ($type,$increment,$rows) = @_;
     my $result;
     if ($env{'form.answer_output_mode'} eq 'tex') {
 	undef(@answer_bits);
@@ -609,34 +819,62 @@ sub answer_header {
 	}
 	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. ')</td>';
+	    $result .= $td.($Apache::lonxml::counter+$increment). ')</td>';
 	} else {
-	    $result .= '<td>Answer for Part:'.$Apache::inputtags::part.'</td>';
+	    $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 {
-    my ($type,$answer) = @_;
+    my ($type,$answer,$args) = @_;
     my $result;
     if ($env{'form.answer_output_mode'} eq 'tex') {
-	my $to_use='|';
-	foreach my $value (32..126) {
-	    my $char=pack('c',$value);
-	    if ($answer !~ /\Q$char\E/) {
-		$to_use=$char;
-		last;
+	if (!$args->{'no_verbatim'}) {
+	    my $to_use='|';
+	    foreach my $value (32..126) {
+		my $char=pack('c',$value);
+		if ($answer !~ /\Q$char\E/) {
+		    $to_use=$char;
+		    last;
+		}
 	    }
+            my $fullanswer=$answer;
+            $answer='';
+            foreach my $element (split(/[\;]/,$fullanswer)) {
+	       if ($element ne '') {
+	 	  $answer.= '\verb'.$to_use.$element.$to_use.' \newline';
+	       }
+            }
 	}
 	if ($answer ne '') {
-	    push(@answer_bits,'\verb'.$to_use.$answer.$to_use);
+	    push(@answer_bits,$answer);
 	}
     } else {
-	$result = '<td>'.$answer.'</td>';
+	if ($need_row_start) {
+	    $result .= '<tr>';
+	    $need_row_start = 0;
+	}
+	$result .= '<td>'.$answer.'</td>';
     }
     return $result;
 }
@@ -645,12 +883,17 @@ sub answer_footer {
     my ($type) = @_;
     my $result;
     if ($env{'form.answer_output_mode'} eq 'tex') {
-	my $columns = scalar(@answer_bits);
-	$result  = ' \vskip 0 mm \noindent \begin{tabular}{|'.'c|'x$columns.'}\hline ';
-	$result .= join(' & ',@answer_bits);
-	$result .= ' \\\\ \\hline \end{tabular} \vskip 0 mm ';
+	$result  = ' \vskip 0 mm \noindent \begin{tabular}{|p{1.5cm}|p{6.8cm}|}\hline ';
+	$result .= $answer_bits[0].'&\vspace*{-4mm}\begin{itemize}';
+        for (my $i=1;$i<=$#answer_bits;$i++) {
+            $result.='\item '.$answer_bits[$i].'\vspace*{-7mm}';
+        }
+	$result .= ' \end{itemize} \\\\ \hline \end{tabular} \vskip 0 mm ';
     } else {
-	$result = '</tr></table>';
+	if (!$need_row_start) {
+	    $result .= '</tr>';
+	}
+	$result .= '</table>';
     }
     return $result;
 }
@@ -659,7 +902,7 @@ sub answer_footer {
 
 sub showallfoils {
     if (defined($env{'form.showallfoils'})) {
-	my ($symb)=&Apache::lonxml::whichuser();
+	my ($symb)=&Apache::lonnet::whichuser();
 	if (($env{'request.state'} eq 'construct') || 
 	    ($env{'user.adv'} && $symb eq '')      ||
             ($Apache::lonhomework::viewgrades) ) {
@@ -670,14 +913,44 @@ sub showallfoils {
     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 - (defaults to 1) if a problem has more than one bubble
+            response, pass in the number of the bubble wanted, (the
+            first bubble associated with a problem has an offset of 1,
+            the second bubble is 2
+
+  $resulttype - undef    -> a number between 0 and 25
+                'A is 1' -> a number between 1 and 26
+                'letter' -> a letter between 'A' and 'Z'
+  $lines  - undef problem only needs a single line of bubbles.
+            nonzero  Problem wants the first nonempty response in 
+                      $lines lines of bubbles.
+  $bubbles_per_line - Must be provided if lines is defined.. number of
+                      bubbles on a line.
+
+=cut
+
 sub getresponse {
-    my ($temp,$resulttype)=@_;
+    my ($offset,$resulttype, $lines, $bubbles_per_line)=@_;
     my $formparm='form.HWVAL_'.$Apache::inputtags::response['-1'];
     my $response;
-    if (!defined($temp)) {
-	$temp=1;
+    if (!defined($offset)) {
+	$offset=1;
     } else {
-	$formparm.=":$temp";
+	$formparm.=":$offset";
+    }
+    if (!defined($lines)) {
+	$lines = 1;
     }
     my %let_to_num=('A'=>0,'B'=>1,'C'=>2,'D'=>3,'E'=>4,'F'=>5,'G'=>6,'H'=>7,
 		    'I'=>8,'J'=>9,'K'=>10,'L'=>11,'M'=>12,'N'=>13,'O'=>14,
@@ -686,8 +959,17 @@ sub getresponse {
     if ($env{'form.submitted'} eq 'scantron') {
 	my $part  = $Apache::inputtags::part;
 	my $id    = $Apache::inputtags::response[-1];
-	$response = $env{'scantron.'.($Apache::lonxml::counter+$temp-1).
-			 '.answer'};
+	
+	my $line;
+	for ($line = 0; $line < $lines; $line++) {
+	    my $theline = $Apache::lonxml::counter+$offset-1+$line;
+	    $response = $env{"scantron.$theline.answer"};
+	    if ((defined($response)) && ($response ne "") && ($response ne " ")) {
+		last;
+	    }
+	    
+	}
+
 	# save bubbled letter for later
 	$Apache::lonhomework::results{"resource.$part.$id.scantron"}.=
 	    $response;
@@ -697,13 +979,35 @@ sub getresponse {
 	    } else {
 		$response = $let_to_num{$response};
 	    }
+	    if ($response ne "") {
+		$response += $line * $bubbles_per_line;
+	    }
+	} else {
+	    if ($response ne "") {
+		$response = chr(ord($response) + $line * $bubbles_per_line);
+	    }
 	}
+
     } else {
 	$response = $env{$formparm};
     }
+    # 
+    #  If we have a nonempty answer, correct the numeric value
+    #  of the answer for the line on which it was found.
+    #
+
     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");
@@ -713,6 +1017,30 @@ sub 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();
@@ -787,7 +1115,7 @@ sub show_answer {
     my $award  = $Apache::lonhomework::history{"resource.$part.solved"};
     my $status = $Apache::inputtags::status[-1];
     return  ( ($award =~ /^correct/
-	       && lc($Apache::lonhomework::problemstatus) ne 'no')
+	       && &Apache::lonhomework::show_problem_status())
 	      || $status eq "SHOW_ANSWER");
 }
 
@@ -849,6 +1177,19 @@ sub pick_foil_for_concept {
 
 }
 
+=pod
+
+=item get_response_param()
+
+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
+	$default   - Default value for the paramter.
+
+=cut
+
 sub get_response_param {
     my ($id,$name,$default)=@_;
     my $parameter;
@@ -873,15 +1214,21 @@ sub submitted {
     if ($who eq 'scantron') { return 0; }
     # if the Submit Answer button for this particular part was pressed
     my $partid=$Apache::inputtags::part;
-    if (defined($env{'form.submit_'.$partid})) { return 1; }
+    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
+    # otherwise no submission occurred
     return 0;
 }
 
 sub add_to_gradingqueue {
-    my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+    my ($symb,$courseid,$domain,$name) = &Apache::lonnet::whichuser();
     if (   $courseid eq ''
 	|| $symb eq ''
 	|| $env{'request.state'} eq 'construct'
@@ -903,17 +1250,24 @@ sub add_to_gradingqueue {
     }
 }
 
-# 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
+=pod 
+
+=item check_status()
+
+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
+
+=cut
+
 sub check_status {
     my ($id)=@_;
-    if (!$id) {	$id=$Apache::linputtags::part; }
+    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");
@@ -933,6 +1287,53 @@ sub check_status {
     return 2;
 }
 
+=pod
+
+=item setup_prior_tries_hash($func,$data)
+
+  Foreach each past .submission $func is called with 3 arguments
+     - the mode to set things up for (currently always 'grade')
+     - the stored .submission string
+     - The expansion of $data
+
+  $data is an array ref containing elements that are either
+    - scalars that are other elements of the history hash to pass to $func
+    - ref to data to be passed untouched to $func
+
+=cut
+
+sub setup_prior_tries_hash {
+    my ($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;
 __END__
  
+=pod
+
+=back
+
+=cut
\ No newline at end of file