--- loncom/interface/spreadsheet/Spreadsheet.pm	2003/12/05 22:24:20	1.21.2.1
+++ loncom/interface/spreadsheet/Spreadsheet.pm	2005/04/29 18:13:07	1.43
@@ -1,5 +1,5 @@
 #
-# $Id: Spreadsheet.pm,v 1.21.2.1 2003/12/05 22:24:20 matthew Exp $
+# $Id: Spreadsheet.pm,v 1.43 2005/04/29 18:13:07 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -48,6 +48,8 @@ Spreadsheet
 package Apache::Spreadsheet;
 
 use strict;
+#use warnings FATAL=>'all';
+#no warnings 'uninitialized';
 use Apache::Constants qw(:common :http);
 use Apache::lonnet;
 use Safe;
@@ -57,6 +59,7 @@ use HTML::Entities();
 use HTML::TokeParser;
 use Spreadsheet::WriteExcel;
 use Time::HiRes;
+use Apache::lonlocal;
 
 ##
 ## Package Variables
@@ -83,6 +86,15 @@ sub new {
     my ($stype) = ($class =~ /Apache::(.*)$/);
     #
     my ($name,$domain,$filename,$usymb)=@_;
+    if (defined($usymb) && ref($usymb)) {
+        $usymb = $usymb->symb;
+    }
+    if (! defined($name) || $name eq '') {
+        $name = $env{'user.name'};
+    }
+    if (! defined($domain) || $domain eq '') {
+        $domain = $env{'user.domain'};
+    }
     #
     my $self = {
         name     => $name,
@@ -90,13 +102,13 @@ sub new {
         type     => $stype,
         symb     => $usymb,
         errorlog => '',
-        maxrow   => '',
-        cid      => $ENV{'request.course.id'},
-        cnum     => $ENV{'course.'.$ENV{'request.course.id'}.'.num'},
-        cdom     => $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
-        chome    => $ENV{'course.'.$ENV{'request.course.id'}.'.home'},
-        coursedesc => $ENV{'course.'.$ENV{'request.course.id'}.'.description'},
-        coursefilename => $ENV{'request.course.fn'},
+        maxrow   => 0,
+        cid      => $env{'request.course.id'},
+        cnum     => $env{'course.'.$env{'request.course.id'}.'.num'},
+        cdom     => $env{'course.'.$env{'request.course.id'}.'.domain'},
+        chome    => $env{'course.'.$env{'request.course.id'}.'.home'},
+        coursedesc => $env{'course.'.$env{'request.course.id'}.'.description'},
+        coursefilename => $env{'request.course.fn'},
         #
         # Flags
         temporary => 0,  # true if this sheet has been modified but not saved
@@ -120,8 +132,8 @@ sub new {
     #
     # Load in the spreadsheet definition
     $self->filename($filename);
-    if (exists($ENV{'form.workcopy'}) && 
-        $self->{'type'} eq $ENV{'form.workcopy'}) {
+    if (exists($env{'form.workcopy'}) && 
+        $self->{'type'} eq $env{'form.workcopy'}) {
         $self->load_tmp();
     } else {
         $self->load();
@@ -148,8 +160,8 @@ sub filename {
             $newfilename !~ /\w/ || $newfilename eq '') {
             my $key = 'course.'.$self->{'cid'}.'.spreadsheet_default_'.
                 $self->{'type'};
-            if (exists($ENV{$key}) && $ENV{$key} ne '') {
-                $newfilename = $ENV{$key};
+            if (exists($env{$key}) && $env{$key} ne '') {
+                $newfilename = $env{$key};
             } else {
                 $newfilename = 'default_'.$self->{'type'};
             }
@@ -157,7 +169,8 @@ sub filename {
         if ($newfilename !~ /\w/ || $newfilename =~ /^\W*$/) {
             $newfilename = 'default_'.$self->{'type'};
         }
-        if ($newfilename !~ /^default\.$self->{'type'}$/ ) {
+        if ($newfilename !~ /^default\.$self->{'type'}$/ &&
+            $newfilename !~ /^\/res\/(.*)spreadsheet$/) {
             if ($newfilename !~ /_$self->{'type'}$/) {
                 $newfilename =~ s/[\s_]*$//;
                 $newfilename .= '_'.$self->{'type'};
@@ -229,6 +242,16 @@ sub initialize {
     # the descendents of the spreadsheet class.
 }
 
+sub clear_package {
+    # This method is here to remind you that it will be overridden by
+    # the descendents of the spreadsheet class.
+}
+
+sub cleanup {
+    my $self = shift();
+    $self->clear_package();
+}
+
 sub initialize_spreadsheet_package {
     &load_spreadsheet_expirationdates();
     &clear_spreadsheet_definition_cache();
@@ -236,10 +259,10 @@ sub initialize_spreadsheet_package {
 
 sub load_spreadsheet_expirationdates {
     undef %expiredates;
-    my $cid=$ENV{'request.course.id'};
+    my $cid=$env{'request.course.id'};
     my @tmp = &Apache::lonnet::dump('nohist_expirationdates',
-                                    $ENV{'course.'.$cid.'.domain'},
-                                    $ENV{'course.'.$cid.'.num'});
+                                    $env{'course.'.$cid.'.domain'},
+                                    $env{'course.'.$cid.'.num'});
     if (lc($tmp[0]) !~ /^error/){
         %expiredates = @tmp;
     }
@@ -248,6 +271,7 @@ sub load_spreadsheet_expirationdates {
 sub check_expiration_time {
     my $self = shift;
     my ($time)=@_;
+    return 0 if (! defined($time));
     my ($key1,$key2,$key3,$key4,$key5);
     # Description of keys
     #
@@ -286,18 +310,26 @@ Returns the safe space required by a Spr
 =cut
 
 ######################################################
+{ 
+
+    my $safeeval;
+
 sub initialize_safe_space {
-    my $self = shift;
-    my $safeeval = new Safe(shift);
-    my $safehole = new Safe::Hole;
-    $safeeval->permit("entereval");
-    $safeeval->permit(":base_math");
-    $safeeval->permit("sort");
-    $safeeval->deny(":base_io");
-    $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
-    $safehole->wrap(\&mask,$safeeval,'&mask');
-    $safeeval->share('$@');
-    my $code=<<'ENDDEFS';
+  my $self = shift;
+  my $usection = &Apache::lonnet::getsection($self->{'domain'},
+                                             $self->{'name'},
+                                             $env{'request.course.id'});
+  if (! defined($safeeval)) {
+      $safeeval = new Safe(shift);
+      my $safehole = new Safe::Hole;
+      $safeeval->permit("entereval");
+      $safeeval->permit(":base_math");
+      $safeeval->permit("sort");
+      $safeeval->deny(":base_io");
+      $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&Apache::lonnet::EXT');
+      $safehole->wrap(\&mask,$safeeval,'&mask');
+      $safeeval->share('$@');
+      my $code=<<'ENDDEFS';
 # ---------------------------------------------------- Inside of the safe space
 #
 # f: formulas
@@ -353,6 +385,25 @@ $errormsg = '';
 
 =pod
 
+=item EXT(parameter)
+
+Calls the system EXT function to determine the value of the given parameter.
+
+=cut
+
+#-------------------------------------------------------
+sub EXT {
+    my ($parameter) = @_;
+    return '' if (! defined($parameter) || $parameter eq '');
+    $parameter =~ s/^parameter\./resource\./;
+    my $value = &Apache::lonnet::EXT($parameter,$symb,$domain,$name,$usection);
+    return $value;
+}
+
+#-------------------------------------------------------
+
+=pod
+
 =item NUM(range)
 
 returns the number of items in the range.
@@ -362,7 +413,7 @@ returns the number of items in the range
 #-------------------------------------------------------
 sub NUM {
     my $mask=&mask(@_);
-    my $num= $#{@{grep(/$mask/,keys(%sheet_values))}}+1;
+    my $num= $#{@{grep(eval("/$mask/"),keys(%sheet_values))}}+1;
     return $num;   
 }
 
@@ -379,7 +430,7 @@ sub BIN {
     my ($low,$high,$lower,$upper)=@_;
     my $mask=&mask($lower,$upper);
     my $num=0;
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
         if (($sheet_values{$_}>=$low) && ($sheet_values{$_}<=$high)) {
             $num++;
         }
@@ -401,7 +452,7 @@ returns the sum of items in the range.
 sub SUM {
     my $mask=&mask(@_);
     my $sum=0;
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
         $sum+=$sheet_values{$_};
     }
     return $sum;   
@@ -422,7 +473,7 @@ sub MEAN {
     my $mask=&mask(@_);
     my $sum=0; 
     my $num=0;
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
         $sum+=$sheet_values{$_};
         $num++;
     }
@@ -447,14 +498,14 @@ compute the standard deviation of the it
 sub STDDEV {
     my $mask=&mask(@_);
     my $sum=0; my $num=0;
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
         $sum+=$sheet_values{$_};
         $num++;
     }
     unless ($num>1) { return undef; }
     my $mean=$sum/$num;
     $sum=0;
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
         $sum+=($sheet_values{$_}-$mean)**2;
     }
     return sqrt($sum/($num-1));    
@@ -474,7 +525,7 @@ compute the product of the items in the
 sub PROD {
     my $mask=&mask(@_);
     my $prod=1;
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
         $prod*=$sheet_values{$_};
     }
     return $prod;   
@@ -494,7 +545,7 @@ compute the maximum of the items in the
 sub MAX {
     my $mask=&mask(@_);
     my $max='-';
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
         unless ($max) { $max=$sheet_values{$_}; }
         if (($sheet_values{$_}>$max) || ($max eq '-')) { 
             $max=$sheet_values{$_}; 
@@ -517,7 +568,7 @@ compute the minimum of the items in the
 sub MIN {
     my $mask=&mask(@_);
     my $min='-';
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
         unless ($max) { $max=$sheet_values{$_}; }
         if (($sheet_values{$_}<$min) || ($min eq '-')) { 
             $min=$sheet_values{$_}; 
@@ -542,10 +593,10 @@ sub SUMMAX {
     my ($num,$lower,$upper)=@_;
     my $mask=&mask($lower,$upper);
     my @inside=();
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
 	push (@inside,$sheet_values{$_});
     }
-    @inside=sort(@inside);
+    @inside=sort {$a <=> $b} (@inside);
     my $sum=0; my $i;
     for ($i=$#inside;(($i>$#inside-$num) && ($i>=0));$i--) { 
         $sum+=$inside[$i];
@@ -569,10 +620,10 @@ sub SUMMIN {
     my ($num,$lower,$upper)=@_;
     my $mask=&mask($lower,$upper);
     my @inside=();
-    foreach (grep /$mask/,keys(%sheet_values)) {
+    foreach (grep eval("/$mask/"),keys(%sheet_values)) {
 	$inside[$#inside+1]=$sheet_values{$_};
     }
-    @inside=sort(@inside);
+    @inside=sort {$a <=> $b} (@inside);
     my $sum=0; my $i;
     for ($i=0;(($i<$num) && ($i<=$#inside));$i++) { 
         $sum+=$inside[$i];
@@ -595,7 +646,6 @@ parametername should be a string such as
 sub MINPARM {
     my ($expression) = @_;
     my $min = undef;
-    study($expression);
     foreach $parameter (keys(%c)) {
         next if ($parameter !~ /$expression/);
         if ((! defined($min)) || ($min > $c{$parameter})) {
@@ -620,7 +670,6 @@ parametername should be a string such as
 sub MAXPARM {
     my ($expression) = @_;
     my $max = undef;
-    study($expression);
     foreach $parameter (keys(%c)) {
         next if ($parameter !~ /$expression/);
         if ((! defined($min)) || ($max < $c{$parameter})) {
@@ -664,20 +713,25 @@ sub calc {
 
 # ------------------------------------------- End of "Inside of the safe space"
 ENDDEFS
-    $safeeval->reval($code);
+        $safeeval->reval($code);
+    }
     $self->{'safe'} = $safeeval;
     $self->{'root'} = $self->{'safe'}->root();
     #
     # Place some of the %$self  items into the safe space except the safe space
     # itself
     my $initstring = '';
-    foreach (qw/name domain type usymb cid csec coursefilename
+    foreach (qw/name domain type symb cid csec coursefilename
              cnum cdom chome uhome/) {
         $initstring.= qq{\$$_="$self->{$_}";};
     }
+    $initstring.=qq{\$usection="$usection";};
     $self->{'safe'}->reval($initstring);
     return $self;
 }
+
+}
+
 ######################################################
 
 =pod
@@ -691,6 +745,17 @@ ENDDEFS
 
 ######################################################
 
+=pod
+
+=item  &mask($lower,$upper)
+
+Inputs: $lower and $upper, cell names ("X12" or "a150") or globs ("X*").
+
+Returns:  Regular expression matching spreadsheet cells that are within
+the rectangle defined by $lower and $upper.  Due to the nature of the
+regular expression this result must be used inside an eval().
+
+=cut
 
 ######################################################
 {
@@ -705,78 +770,62 @@ sub mask {
     }
     $upper = $lower if (! defined($upper));
     #
-    my ($la,$ld) = ($lower=~/([A-Za-z]|\*)(\d+|\*)/);
-    my ($ua,$ud) = ($upper=~/([A-Za-z]|\*)(\d+|\*)/);
+    my ($la,$ld) = ($lower=~/([A-z]|\*)(\d+|\*)/);
+    my ($ua,$ud) = ($upper=~/([A-z]|\*)(\d+|\*)/);
     #
     my $alpha='';
     my $num='';
     #
+    # Do not put parenthases around $alpha.
+    # $num depends on the value in $1.
     if (($la eq '*') || ($ua eq '*')) {
-        $alpha='[A-Za-z]';
+        $alpha='[A-z]';
     } else {
-       if (($la=~/[A-Z]/) && ($ua=~/[A-Z]/) ||
-           ($la=~/[a-z]/) && ($ua=~/[a-z]/)) {
-          $alpha='['.$la.'-'.$ua.']';
-       } else {
-          $alpha='['.$la.'-Za-'.$ua.']';
-       }
-    }   
-    if (($ld eq '*') || ($ud eq '*')) {
-	$num='\d+';
+        if ($la gt $ua) {
+            my $tmp = $ua;
+            $ua = $la;
+            $la = $ua;
+        }
+        $alpha=qq/[$la-$ua]/;
+    }
+    if ($ld ne '*' && $ud ne '*') {
+        # Make sure $ld <= $ud
+        if ($ld > $ud) {
+            my $tmp = $ud;
+            $ud = $ld;
+            $ld = $tmp;
+        }
+        # Here we make a regular expression using some advanced regexp
+        # abilities.
+        # (\d+) will match the digits of the cell name and dump them in
+        #     to $1
+        # (?(?{ ... code ...} pattern_if_true | pattern_if_false)) will
+        #     choose pattern_if_true if { ... code ... } is true and
+        #     pattern_if_false if { ... code ... } is false.
+        # In this case, pattern_if_true is empty.  pattern_if_false is 
+        #     'donotmatch' and will not match our cells because none of 
+        #     them end with donotmatch.  
+        # Unfortunately, the use of this type of regular expression 
+        #     requires that each match be wrapped in an eval().  Search for
+        #     $mask in this module for examples
+        $num = '(\d+)(?(?{$1>= '.$ld.' && $1<='.$ud.'})|donotmatch)';
     } else {
-        if (length($ld)!=length($ud)) {
-           $num.='(';
-	   foreach ($ld=~m/\d/g) {
-              $num.='['.$_.'-9]';
-	   }
-           if (length($ud)-length($ld)>1) {
-              $num.='|\d{'.(length($ld)+1).','.(length($ud)-1).'}';
-	   }
-           $num.='|';
-           foreach ($ud=~m/\d/g) {
-               $num.='[0-'.$_.']';
-           }
-           $num.=')';
-       } else {
-           my @lda=($ld=~m/\d/g);
-           my @uda=($ud=~m/\d/g);
-           my $i; 
-           my $j=0; 
-           my $notdone=1;
-           for ($i=0;($i<=$#lda)&&($notdone);$i++) {
-               if ($lda[$i]==$uda[$i]) {
-		   $num.=$lda[$i];
-                   $j=$i;
-               } else {
-                   $notdone=0;
-               }
-           }
-           if ($j<$#lda-1) {
-	       $num.='('.$lda[$j+1];
-               for ($i=$j+2;$i<=$#lda;$i++) {
-                   $num.='['.$lda[$i].'-9]';
-               }
-               if ($uda[$j+1]-$lda[$j+1]>1) {
-		   $num.='|['.($lda[$j+1]+1).'-'.($uda[$j+1]-1).']\d{'.
-                   ($#lda-$j-1).'}';
-               }
-	       $num.='|'.$uda[$j+1];
-               for ($i=$j+2;$i<=$#uda;$i++) {
-                   $num.='[0-'.$uda[$i].']';
-               }
-               $num.=')';
-           } else {
-               if ($lda[-1]!=$uda[-1]) {
-                  $num.='['.$lda[-1].'-'.$uda[-1].']';
-	       }
-           }
-       }
+        $num = '(\d+)';
     }
-    my $expression ='^'.$alpha.$num."\$";
+    my $expression = '^'.$alpha.$num.'$';
     $memoizer{$key} = $expression;
     return $expression;
 }
 
+#
+# Debugging routine
+sub dump_memoized_values {
+    while (my ($key,$value) = each(%memoizer)) {
+        &Apache::lonnet::logthis('memoizer: '.$key.' = '.$value);
+    }
+    return;
+}
+
 }
 
 ##
@@ -827,7 +876,6 @@ sub expandnamed {
         my @matches = ();
         my @values = ();
         $#matches = -1;
-        study $expression;
         while (my($parameter,$value) = each(%{$self->{'constants'}})) {
             next if ($parameter !~ /$expression/);
             push(@matches,$parameter);
@@ -889,7 +937,8 @@ sub sett {
             $t{$cell}=~s/(^|[^\"\'])([A-Za-z]\d+)/$1\$sheet_values\{\'$2\'\}/g;
             $t{$cell}=~s/(^|[^\"\'])\[([^\]]+)\]/$1.$self->expandnamed($2)/ge;
         } elsif  ( $col  =~ /^[A-Z]$/  ) {
-            if ($formula !~ /^\!/ && exists($self->{'constants'}->{$cell})) {
+            if ($formula !~ /^\!/ && exists($self->{'constants'}->{$cell})
+		&& $self->{'constants'}->{$cell} ne '') {
                 my $data = $self->{'constants'}->{$cell};
                 $t{$cell} = $data;
             }
@@ -1127,7 +1176,6 @@ sub calcsheet {
     return $result;
 }
 
-
 sub set_badcalc {
     my $self = shift();
     $self->{'badcalc'} =1;
@@ -1165,7 +1213,6 @@ sub calcerror {
     return;
 }
 
-
 ###########################################################
 ##
 ## Output Helpers
@@ -1174,18 +1221,30 @@ sub calcerror {
 sub display {
     my $self = shift;
     my ($r) = @_;
-    $self->compute($r);
     my $outputmode = 'html';
-    if ($ENV{'form.output_format'} =~ /^(html|excel|csv)$/) {
-        $outputmode = $ENV{'form.output_format'};
+    foreach ($self->output_options()) {
+        if ($env{'form.output_format'} eq $_->{'value'}) {
+            $outputmode = $_->{'value'};
+            last;
+        }
     }
     if ($outputmode eq 'html') {
+        $self->compute($r);
         $self->outsheet_html($r);
+    } elsif ($outputmode eq 'htmlclasslist') {
+        # No computation neccessary...  This is kludgy
+        $self->outsheet_htmlclasslist($r);
     } elsif ($outputmode eq 'excel') {
+        $self->compute($r);
         $self->outsheet_excel($r);
     } elsif ($outputmode eq 'csv') {
+        $self->compute($r);
         $self->outsheet_csv($r);
+    } elsif ($outputmode eq 'xml') {
+#        $self->compute($r);
+        $self->outsheet_xml($r);
     }
+    $self->cleanup();
     return;
 }
 
@@ -1197,7 +1256,7 @@ sub html_report_error {
     my $Str = '';
     if ($self->badcalc()) {
         $Str = '<h3 style="color:red">'.
-            'An error occurred while calculating this spreadsheet'.
+            &mt('An error occurred while calculating this spreadsheet').
             "</h3>\n".
             '<pre>'.$self->calcerror()."</pre>\n";
     }
@@ -1208,7 +1267,7 @@ sub html_export_row {
     my $self = shift();
     my ($color) = @_;
     $color = '#CCCCFF' if (! defined($color));
-    my $allowed = &Apache::lonnet::allowed('mgr',$ENV{'request.course.id'});
+    my $allowed = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
     my $row_html;
     my @rowdata = $self->get_row(0);
     foreach my $cell (@rowdata) {
@@ -1225,7 +1284,7 @@ sub html_export_row {
 
 sub html_template_row {
     my $self = shift();
-    my $allowed = &Apache::lonnet::allowed('mgr',$ENV{'request.course.id'});
+    my $allowed = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
     my ($num_uneditable,$importcolor) = @_;
     my $row_html;
     my @rowdata = $self->get_template_row();
@@ -1262,7 +1321,7 @@ sub html_editable_cell {
     } elsif ($value =~ /^\s*$/ ) {
         $value = '<font color="'.$bgcolor.'">#</font>';
     } else {
-        $value = &HTML::Entities::encode($value) if ($value !~/&nbsp;/);
+        $value = &HTML::Entities::encode($value,'<>&"') if ($value !~/&nbsp;/);
     }
     return $value if (! $allowed);
     #
@@ -1285,14 +1344,14 @@ sub html_editable_cell {
 sub html_uneditable_cell {
     my ($cell,$bgcolor) = @_;
     my $value = (defined($cell) ? $cell->{'value'} : '');
-    $value = &HTML::Entities::encode($value) if ($value !~/&nbsp;/);
+    $value = &HTML::Entities::encode($value,'<>&"') if ($value !~/&nbsp;/);
     return '&nbsp;'.$value.'&nbsp;';
 }
 
 sub html_row {
     my $self = shift();
     my ($num_uneditable,$row,$exportcolor,$importcolor) = @_;
-    my $allowed = &Apache::lonnet::allowed('mgr',$ENV{'request.course.id'});
+    my $allowed = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
     my @rowdata = $self->get_row($row);
     my $num_cols_output = 0;
     my $row_html;
@@ -1316,30 +1375,42 @@ sub html_row {
 
 sub html_header {
     my $self = shift;
-    return '' if (! $ENV{'request.role.adv'});
+    return '' if (! $env{'request.role.adv'});
     return "<table>\n".
-        '<tr><th align="center">Output Format</th><tr>'."\n".
-        '<tr><td>'.&output_selector()."</td></tr>\n".
+        '<tr><th align="center">'.&mt('Output Format').'</th></tr>'."\n".
+        '<tr><td>'.$self->output_selector()."</td></tr>\n".
         "</table>\n";
 }
 
+##
+## Default output types are HTML, Excel, and CSV
+sub output_options {
+    my $self = shift();
+    return  ({value       => 'html',
+              description => 'HTML'},
+             {value       => 'excel',
+              description => 'Excel'},
+#             {value       => 'xml',
+#              description => 'XML'},
+             {value       => 'csv',
+              description => 'Comma Separated Values'},);
+}
+
 sub output_selector {
+    my $self = shift();
     my $output_selector = '<select name="output_format" size="3">'."\n";
     my $default = 'html';
-    if (exists($ENV{'form.output_format'})) {
-        $default = $ENV{'form.output_format'} 
+    if (exists($env{'form.output_format'})) {
+        $default = $env{'form.output_format'} 
     } else {
-        $ENV{'form.output_format'} = $default;
+        $env{'form.output_format'} = $default;
     }
-    foreach (['html','HTML'],
-             ['excel','Excel'],
-             ['csv','Comma Seperated Values']) {
-        my ($name,$description) = @{$_};
-        $output_selector.=qq{<option value="$name"};
-        if ($name eq $default) {
+    foreach  ($self->output_options()) {
+        $output_selector.='<option value="'.$_->{'value'}.'"';
+        if ($_->{'value'} eq $default) {
             $output_selector .= ' selected';
         }
-        $output_selector .= ">$description</option>\n";
+        $output_selector .= ">".&mt($_->{'description'})."</option>\n";
     }
     $output_selector .= "</select>\n";
     return $output_selector;
@@ -1363,38 +1434,28 @@ sub excel_output_row {
     return;
 }
 
-sub create_excel_spreadsheet {
+#
+# This routine is just a stub 
+sub outsheet_htmlclasslist {
     my $self = shift;
     my ($r) = @_;
-    my $filename = '/prtspool/'.
-        $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
-        time.'_'.rand(1000000000).'.xls';
-    my $workbook  = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
-    if (! defined($workbook)) {
-        $r->log_error("Error creating excel spreadsheet $filename: $!");
-        $r->print("Problems creating new Excel file.  ".
-                  "This error has been logged.  ".
-                  "Please alert your LON-CAPA administrator");
-        return undef;
-    }
-    #
-    # The excel spreadsheet stores temporary data in files, then put them
-    # together.  If needed we should be able to disable this (memory only).
-    # The temporary directory must be specified before calling 'addworksheet'.
-    # File::Temp is used to determine the temporary directory.
-    $workbook->set_tempdir('/home/httpd/perl/tmp');
-    #
-    # Determine the name to give the worksheet
-    return ($workbook,$filename);
+    $r->print('<h2>'.&mt("This output is not supported").'</h2>');
+    $r->rflush();
+    return;
 }
 
 sub outsheet_excel {
     my $self = shift;
     my ($r) = @_;
-    $r->print("<h2>Preparing Excel Spreadsheet</h2>");
+    my $connection = $r->connection();
     #
-    # Create excel worksheet
-    my ($workbook,$filename) = $self->create_excel_spreadsheet($r);
+    $r->print($self->html_report_error());
+    $r->rflush();
+    #
+    $r->print("<h2>".&mt('Preparing Excel Spreadsheet')."</h2>");
+    #
+    # Create excel workbook
+    my ($workbook,$filename,$format)=&Apache::loncommon::create_workbook($r);
     return if (! defined($workbook));
     #
     # Create main worksheet
@@ -1405,21 +1466,22 @@ sub outsheet_excel {
     # Write excel header
     foreach my $value ($self->get_title()) {
         $cols_output = 0;
-        $worksheet->write($rows_output++,$cols_output,$value);
+        $worksheet->write($rows_output++,$cols_output,$value,$format->{'h1'});
     }
     $rows_output++;    # skip a line
     #
     # Write summary/export row
     $cols_output = 0;
-    $self->excel_output_row($worksheet,0,$rows_output++,'Summary');
+    $self->excel_output_row($worksheet,0,$rows_output++,'Summary',
+                            $format->{'b'});
     $rows_output++;    # skip a line
     #
-    $self->excel_rows($worksheet,$cols_output,$rows_output);
+    $self->excel_rows($connection,$worksheet,$cols_output,$rows_output,
+                      $format);
     #
     #
     # Close the excel file
     $workbook->close();
-    $r->print($self->html_report_error());
     #
     # Write a link to allow them to download it
     $r->print('<br />'.
@@ -1433,19 +1495,24 @@ sub outsheet_excel {
 sub outsheet_csv   {
     my $self = shift;
     my ($r) = @_;
+    my $connection = $r->connection();
+    #
+    $r->print($self->html_report_error());
+    $r->rflush();
+    #
     my $csvdata = '';
     my @Values;
     #
     # Open the csv file
     my $filename = '/prtspool/'.
-        $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
+        $env{'user.name'}.'_'.$env{'user.domain'}.'_'.
         time.'_'.rand(1000000000).'.csv';
     my $file;
     unless ($file = Apache::File->new('>'.'/home/httpd'.$filename)) {
         $r->log_error("Couldn't open $filename for output $!");
-        $r->print("Problems occured in writing the csv file.  ".
+        $r->print(&mt("Problems occured in writing the csv file.  ".
                   "This error has been logged.  ".
-                  "Please alert your LON-CAPA administrator.");
+                  "Please alert your LON-CAPA administrator."));
         $r->print("<pre>\n".$csvdata."</pre>\n");
         return 0;
     }
@@ -1456,13 +1523,12 @@ sub outsheet_csv   {
     }
     #
     # Output the body of the spreadsheet
-    $self->csv_rows($file);
+    $self->csv_rows($connection,$file);
     #
     # Close the csv file
     close($file);
-    $r->print($self->html_report_error());
     $r->print('<br /><br />'.
-              '<a href="'.$filename.'">Your CSV spreadsheet.</a>'."\n");
+              '<a href="'.$filename.'">'.&mt('Your CSV spreadsheet.').'</a>'."\n");
     #
     return 1;
 }
@@ -1498,17 +1564,20 @@ sub outsheet_xml   {
     ## But not on this day
     my $Str = '<spreadsheet type="'.$self->{'type'}.'">'."\n";
     while (my ($cell,$formula) = each(%{$self->{'formulas'}})) {
-        if ($cell =~ /^template_(\d+)/) {
+        if ($cell =~ /^template_(\w+)/) {
             my $col = $1;
             $Str .= '<template col="'.$col.'">'.$formula.'</template>'."\n";
         } else {
-            my ($row,$col) = ($cell =~ /^([A-z])(\d+)/);
+            my ($col,$row) = ($cell =~ /^([A-z])(\d+)/);
             next if (! defined($row) || ! defined($col));
-            $Str .= '<field row="'.$row.'" col="'.$col.'" >'.$formula.'</cell>'
+            next if ($row != 0);
+            $Str .= 
+                '<field row="'.$row.'" col="'.$col.'" >'.$formula.'</field>'
                 ."\n";
         }
     }
     $Str.="</spreadsheet>";
+    $r->print("<pre>\n\n\n".$Str."\n\n\n</pre>");
     return $Str;
 }
 
@@ -1535,8 +1604,7 @@ sub parse_sheet {
                 $formulas{$cell} = $formula;
                 $sources{$cell}  = $source if (defined($source));
                 $parser->get_text('/field');
-            }
-            if ($token->[1] eq 'template') {
+            } elsif ($token->[1] eq 'template') {
                 $formulas{'template_'.$token->[2]->{'col'}}=
                     $parser->get_text('/template');
             }
@@ -1590,7 +1658,7 @@ sub load {
         # Not cached, need to read
         if (! defined($filename)) {
             $formulas = $self->load_system_default_sheet();
-        } elsif($self->filename() =~ /^\/res\/.*\.spreadsheet$/) {
+        } elsif($filename =~ /^\/res\/.*\.spreadsheet$/) {
             # Load a spreadsheet definition file
             my $sheetxml=&Apache::lonnet::getfile
                 (&Apache::lonnet::filelocation('',$filename));
@@ -1631,7 +1699,7 @@ sub load {
 sub set_row_sources {
     my $self = shift;
     while (my ($cell,$value) = each(%{$self->{'formulas'}})) {
-        next if ($cell !~ /^A(\d+)/ && $1 > 0);
+        next if ($cell !~ /^A(\d+)/ || $1 < 1);
         my $row = $1;
         $self->{'row_source'}->{$row} = $value;
     }
@@ -1653,6 +1721,9 @@ sub set_row_numbers {
 ##
 sub exportrow {
     my $self = shift;
+    if (exists($self->{'badcalc'}) && $self->{'badcalc'}) {
+        return ();
+    }
     my @exportarray;
     foreach my $column (@UC_Columns) {
         push(@exportarray,$self->value($column.'0'));
@@ -1683,7 +1754,7 @@ sub save {
         my $reply = &Apache::lonnet::put($filename,\%f,$cdom,$cnum);
         return $reply if ($reply ne 'ok');
         $reply = &Apache::lonnet::put($stype.'_spreadsheets',
-                     {$filename => $ENV{'user.name'}.'@'.$ENV{'user.domain'}},
+                     {$filename => $env{'user.name'}.'@'.$env{'user.domain'}},
                                       $cdom,$cnum);
         return $reply if ($reply ne 'ok');
         if ($makedef) { 
@@ -1693,8 +1764,10 @@ sub save {
             return $reply if ($reply ne 'ok');
         } 
         if ($self->is_default()) {
-            &Apache::lonnet::expirespread('','',$self->{'type'},'');
-            if ($self->{'type'} eq 'assesscalc') {
+            if ($self->{'type'} eq 'studentcalc') {
+                &Apache::lonnet::expirespread('','','studentcalc','');
+            } elsif ($self->{'type'} eq 'assesscalc') {
+                &Apache::lonnet::expirespread('','','assesscalc','');
                 &Apache::lonnet::expirespread('','','studentcalc','');
             }
         }
@@ -1707,8 +1780,8 @@ sub save {
 
 sub save_tmp {
     my $self = shift;
-    my $filename=$ENV{'user.name'}.'_'.
-        $ENV{'user.domain'}.'_spreadsheet_'.$self->{'symb'}.'_'.
+    my $filename=$env{'user.name'}.'_'.
+        $env{'user.domain'}.'_spreadsheet_'.$self->{'symb'}.'_'.
            $self->{'filename'};
     $filename=~s/\W/\_/g;
     $filename=$Apache::lonnet::tmpdir.$filename.'.tmp';
@@ -1727,8 +1800,8 @@ sub save_tmp {
 
 sub load_tmp {
     my $self = shift;
-    my $filename=$ENV{'user.name'}.'_'.
-        $ENV{'user.domain'}.'_spreadsheet_'.$self->{'symb'}.'_'.
+    my $filename=$env{'user.name'}.'_'.
+        $env{'user.domain'}.'_spreadsheet_'.$self->{'symb'}.'_'.
             $self->{'filename'};
     $filename=~s/\W/\_/g;
     $filename=$Apache::lonnet::tmpdir.$filename.'.tmp';
@@ -1786,9 +1859,9 @@ sub othersheets {
                                       $self->{'cdom'}, $self->{'cnum'});
     my ($tmp) = keys(%results);
     if ($tmp =~ /^(con_lost|error|no_such_host)/i ) {
-        @alternatives = ('Default');
+        @alternatives = (&mt('Default'));
     } else {
-        @alternatives = ('Default', sort (keys(%results)));
+        @alternatives = (&mt('Default'), sort (keys(%results)));
     }
     return @alternatives; 
 }