--- loncom/interface/spreadsheet/assesscalc.pm	2003/11/11 15:36:28	1.28
+++ loncom/interface/spreadsheet/assesscalc.pm	2004/02/03 22:44:02	1.32
@@ -1,5 +1,5 @@
 #
-# $Id: assesscalc.pm,v 1.28 2003/11/11 15:36:28 matthew Exp $
+# $Id: assesscalc.pm,v 1.32 2004/02/03 22:44:02 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -368,7 +368,7 @@ sub parmval {
 
 sub get_html_title {
     my $self = shift;
-    my ($assess_title,$name,$time) = $self->get_title();
+    my ($assess_title,$name,$time) = $self->get_full_title();
     my $title = '<h1>'.$assess_title.'</h1>'.
         '<h2>'.$name.', '.
         &Apache::loncommon::aboutmewrapper
@@ -380,17 +380,21 @@ sub get_html_title {
 
 sub get_title {
     my $self = shift;
-    my @title = ();
     if (($self->{'symb'} eq '_feedback') ||
         ($self->{'symb'} eq '_evaluation') ||
         ($self->{'symb'} eq '_discussion') ||
         ($self->{'symb'} eq '_tutoring')) {
         my $assess_title = ucfirst($self->{'symb'});
         $assess_title =~ s/^_//;
-        push(@title,$assess_title);
+        return $assess_title;
     } else {
-        push(@title,&Apache::lonnet::gettitle($self->{'symb'}));
+        return &Apache::lonnet::gettitle($self->{'symb'});
     }
+}
+
+sub get_full_title {
+    my $self = shift;
+    my @title = ($self->get_title());
     # Look up the users identifying information
     # Get the users information
     my %userenv = &Apache::loncoursedata::GetUserName($self->{'name'},
@@ -415,6 +419,10 @@ sub parent_link {
 sub outsheet_html {
     my $self = shift;
     my ($r) = @_;
+    ####################################
+    # Report any calculation errors    #
+    ####################################
+    $r->print($self->html_report_error());
     ###################################
     # Determine table structure
     ###################################
@@ -523,7 +531,7 @@ sub csv_rows {
     # writes the meat of the spreadsheet to an excel worksheet.  Called
     # by Spreadsheet::outsheet_excel;
     my $self = shift;
-    my ($filehandle) = @_;
+    my ($connection,$filehandle) = @_;
     #
     # Write a header row
     $self->csv_output_row($filehandle,undef,
@@ -546,12 +554,13 @@ sub excel_rows {
     # writes the meat of the spreadsheet to an excel worksheet.  Called
     # by Spreadsheet::outsheet_excel;
     my $self = shift;
-    my ($worksheet,$cols_output,$rows_output) = @_;
+    my ($connection,$worksheet,$cols_output,$rows_output) = @_;
+    return if (! ref($worksheet));
     #
     # Write a header row
     $cols_output = 0;
     foreach my $value ('Parameter','Description','Value') {
-        $worksheet->write($rows_output,$cols_output++,&mt($value));
+        $worksheet->write($rows_output,$cols_output++,$value);
     }
     $rows_output++;    
     #
@@ -772,7 +781,10 @@ sub compute {
     while (my ($parm,$value) = each(%parameters)) {
         my $cell = 'A'.$self->get_row_number_from_key($parm);
         $f{$cell} = $parm;
-        $value = '"'.$value.'"' if ($value =~/[^0-9.]/);
+        if ($parm =~ /_submission$/ && $value =~ /(\{|\})/) {
+            $value = 'witheld';
+        }
+        $value = 'q{'.$value.'}' if ($value =~/([^\d\.]|\.\.)/);
         $c{$parm} = $value;
     }
     $self->formulas(\%f);
@@ -907,13 +919,20 @@ sub export_data {
         $self->compute($r);
     }
     if ($connection->aborted()) { $self->cleanup(); return; }
-    my @Data = @{$Exportrows{$symb}->{$self->{'filename'}}};
-    if ($Data[0] =~ /^(.*)___=___/) {
-        $self->{'sheetname'} = $1;
-        $Data[0] =~ s/^(.*)___=___//;
-    }
-    for (my $i=0;$i<$#Data;$i++) {
-        $Data[$i]="'".$Data[$i]."'" if ($Data[$i]=~/\D/ && defined($Data[$i]));
+    my @Data;
+    if ($self->badcalc()) {
+        @Data = ();
+    } else {
+        @Data = @{$Exportrows{$symb}->{$self->{'filename'}}};
+        if ($Data[0] =~ /^(.*)___=___/) {
+            $self->{'sheetname'} = $1;
+            $Data[0] =~ s/^(.*)___=___//;
+        }
+        for (my $i=0;$i<$#Data;$i++) {
+            if ($Data[$i]=~/\D/ && defined($Data[$i])) {
+                $Data[$i]="'".$Data[$i]."'";
+            }
+        }
     }
     return @Data;
 }
@@ -936,6 +955,11 @@ sub save_export_data {
     return if ($self->temporary());
     my $student = $self->{'name'}.':'.$self->{'domain'};
     my $symb    = $self->{'symb'};
+    if ($self->badcalc()){
+        # do not save data away when calculations have not been done properly.
+        delete($Exportrows{$symb});
+        return;
+    }
     if (! exists($Exportrows{$symb}) || 
         ! exists($Exportrows{$symb}->{$self->{'filename'}})) {
         return;