--- loncom/interface/spreadsheet/Spreadsheet.pm	2005/05/15 04:02:17	1.48
+++ loncom/interface/spreadsheet/Spreadsheet.pm	2006/04/06 16:43:49	1.66
@@ -1,5 +1,5 @@
 #
-# $Id: Spreadsheet.pm,v 1.48 2005/05/15 04:02:17 albertel Exp $
+# $Id: Spreadsheet.pm,v 1.66 2006/04/06 16:43:49 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -85,7 +85,7 @@ sub new {
     my $class = ref($this) || $this;
     my ($stype) = ($class =~ /Apache::(.*)$/);
     #
-    my ($name,$domain,$filename,$usymb)=@_;
+    my ($name,$domain,$filename,$usymb,$section)=@_;
     if (defined($usymb) && ref($usymb)) {
         $usymb = $usymb->symb;
     }
@@ -95,10 +95,15 @@ sub new {
     if (! defined($domain) || $domain eq '') {
         $domain = $env{'user.domain'};
     }
+    if (! defined($section) || $section eq '') {
+        $section = &Apache::lonnet::getsection($domain,$name,
+					       $env{'request.course.id'});
+    }
     #
     my $self = {
         name     => $name,
         domain   => $domain,
+        section  => $section,
         type     => $stype,
         symb     => $usymb,
         errorlog => '',
@@ -111,7 +116,8 @@ sub new {
         #
         # Flags
         temporary => 0,  # true if this sheet has been modified but not saved
-        new_rows  => 0, # true if this sheet has new rows
+        new_rows  => 0,  # true if this sheet has new rows
+	loaded    => 0,  # true if the formulas have been loaded
         #
         # blackout is used to determine if any data needs to be hidden from the
         # student.
@@ -126,15 +132,8 @@ sub new {
     };
     #
     bless($self,$class);
-    #
-    # Load in the spreadsheet definition
     $self->filename($filename);
-    if (exists($env{'form.workcopy'}) && 
-        $self->{'type'} eq $env{'form.workcopy'}) {
-        $self->load_tmp();
-    } else {
-        $self->load();
-    }
+    #
     return $self;
 }
 
@@ -197,6 +196,8 @@ sub make_default {
             {'spreadsheet_default_'.$self->{'type'} => $self->filename()},
                                      $self->{'cdom'},$self->{'cnum'});
     return $result if ($result ne 'ok');
+    &Apache::lonnet::appenv('course.'.$self->{'cid'}.'.spreadsheet_default_'.
+			    $self->{'type'} => $self->filename());
     my $symb = $self->{'symb'};
     $symb = '' if (! defined($symb));
     &Apache::lonnet::expirespread('','',$self->{'type'},$symb);    
@@ -217,16 +218,8 @@ course environment.  Returns 0 otherwise
 sub is_default {
     my $self = shift;
     # Check to find out if we are the default spreadsheet (filenames match)
-    my $default_filename = '';
-    my %tmphash = &Apache::lonnet::get('environment',
-                                       ['spreadsheet_default_'.
-                                        $self->{'type'}],
-                                       $self->{'cdom'},
-                                       $self->{'cnum'});
-    my ($tmp) = keys(%tmphash);
-    if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
-        $default_filename = $tmphash{'spreadsheet_default_'.$self->{'type'}};
-    }
+    my $default_filename = $env{'course.'.$self->{'cid'}.
+				    '.spreadsheet_default_'.$self->{'type'}};
     if ($default_filename =~ /^\s*$/) {
         $default_filename = 'default_'.$self->{'type'};
     }
@@ -390,10 +383,12 @@ Calls the system EXT function to determi
 
 #-------------------------------------------------------
 sub EXT {
-    my ($parameter) = @_;
+    my ($parameter,$specific_symb) = @_;
     return '' if (! defined($parameter) || $parameter eq '');
     $parameter =~ s/^parameter\./resource\./;
-    my $value = &Apache::lonnet::EXT($parameter,$symb,$domain,$name,$usection);
+    if ($specific_symb eq '') { $specific_symb = $symb; }
+    my $value = &Apache::lonnet::EXT($parameter,$specific_symb,$domain,$name,
+				     $usection);
     return $value;
 }
 
@@ -709,7 +704,7 @@ sub get_values {
 	}
 	return \@values;
     } else {
-	$num = '(\d+)';
+	$num = '([1-9]\d*)';
     }
     if (($la eq '*') || ($ua eq '*')) {
         $alpha='[A-z]';
@@ -818,7 +813,7 @@ sub expandnamed {
                 $result.=$thissum.'+';
             } 
             $result=~s/\+$//;
-            return $result;
+            return '('.$result.')';
         } else {
 	    return 0;
         }
@@ -974,15 +969,32 @@ sub formulas {
         $self->{'formulas'} = $formulas;
         $self->{'rows'} = [];
         $self->{'template_cells'} = [];
+	$self->{'loaded'} = 1;
         return;
     } else {
+	$self->check_formulas_loaded();
         return %{$self->{'formulas'}};
     }
 }
 
+sub check_formulas_loaded {
+    my $self=shift;
+    if (!$self->{'loaded'}) {
+	$self->{'loaded'}=1;
+	# Load in the spreadsheet definition
+	if (exists($env{'form.workcopy'}) && 
+	    $self->{'type'} eq $env{'form.workcopy'}) {
+	    $self->load_tmp();
+	} else {
+	    $self->load();
+	}
+    }
+}
+
 sub set_formula {
     my $self = shift;
     my ($cell,$formula) = @_;
+    $self->check_formulas_loaded();
     $self->{'formulas'}->{$cell}=$formula;
     return;
 }
@@ -992,7 +1004,7 @@ sub set_formula {
 ##
 sub formulas_keys {
     my $self = shift;
-    my @keys = keys(%{$self->{'formulas'}});
+    $self->check_formulas_loaded();
     return keys(%{$self->{'formulas'}});
 }
 
@@ -1003,6 +1015,7 @@ sub formulas_keys {
 sub formula {
     my $self = shift;
     my $cell = shift;
+    $self->check_formulas_loaded();
     if (defined($cell) && exists($self->{'formulas'}->{$cell})) {
         return $self->{'formulas'}->{$cell};
     }
@@ -1081,6 +1094,7 @@ sub rebuild_stats {
     my $self = shift;
     $self->{'rows'}=[];
     $self->{'template_cells'}=[];
+    $self->check_formulas_loaded();
     while (my ($cell,$formula) = each(%{$self->{'formulas'}})) {
         push(@{$self->{'rows'}},$1) if ($cell =~ /^A(\d+)/ && $1 != 0);
         push(@{$self->{'template_cells'}},$1) if ($cell =~ /^template_(\w+)/);
@@ -1186,12 +1200,19 @@ sub display {
             last;
         }
     }
+    $self->{outputmode} = $outputmode;
     if ($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 'source') {
+        # No computation necessary. Rumor has it that this is some
+        # sort of kludge w.r.t. not "computing". It's also
+        # a bit of of a kludge that we call "outsheet_html" and 
+        # let the 'outputmode' cause the outputting of source.
+        $self->outsheet_html($r);
     } elsif ($outputmode eq 'excel') {
         $self->compute($r);
         $self->outsheet_excel($r);
@@ -1231,10 +1252,12 @@ sub html_export_row {
     foreach my $cell (@rowdata) {
         if ($cell->{'name'} =~ /^[A-Z]/) {
 	    $row_html .= '<td bgcolor="'.$color.'">'.
-                &html_editable_cell($cell,$color,$allowed).'</td>';
+                &html_editable_cell($cell,$color,$allowed,
+                                    $self->{outputmode} eq 'source').'</td>';
         } else {
 	    $row_html .= '<td bgcolor="#DDCCFF">'.
-                &html_editable_cell($cell,'#DDCCFF',$allowed).'</td>';
+                &html_editable_cell($cell,'#DDCCFF',$allowed,
+                                    $self->{outputmode} eq 'source').'</td>';
         }
     }
     return $row_html;
@@ -1254,14 +1277,15 @@ sub html_template_row {
                 &html_uneditable_cell($cell,'#FFDDDD',$allowed).'</td>';
         } else {
 	    $row_html .= '<td bgcolor="#EOFFDD">'.
-                &html_editable_cell($cell,'#EOFFDD',$allowed).'</td>';
+                &html_editable_cell($cell,'#EOFFDD',$allowed,
+                                    $self->{outputmode} eq 'source').'</td>';
         }
     }
     return $row_html;
 }
 
 sub html_editable_cell {
-    my ($cell,$bgcolor,$allowed) = @_;
+    my ($cell,$bgcolor,$allowed,$showsource) = @_;
     my $result;
     my ($name,$formula,$value);
     if (defined($cell)) {
@@ -1271,7 +1295,13 @@ sub html_editable_cell {
     }
     $name    = '' if (! defined($name));
     $formula = '' if (! defined($formula));
-    if (! defined($value)) {
+    if ($showsource) {
+        if (!defined($formula) || $formula =~ /^\s*$/) {
+            $value = '<font color="'.$bgcolor.'">#</font>';
+        } else {
+            $value = &HTML::Entities::encode($formula, '<>&"');
+        }
+    } elsif (! defined($value)) {
         $value = '<font color="'.$bgcolor.'">#</font>';
         if ($formula ne '') {
             $value = '<i>undefined value</i>';
@@ -1324,7 +1354,8 @@ sub html_row {
 	    $row_html .= &html_uneditable_cell($cell,'#FFDDDD');
 	} else {
 	    $row_html .= '<td bgcolor="#EOFFDD">';
-	    $row_html .= &html_editable_cell($cell,'#E0FFDD',$allowed);
+	    $row_html .= &html_editable_cell($cell,'#E0FFDD',$allowed,
+                                             $self->{outputmode} eq 'source');
 	}
 	$row_html .= '</td>';
     }
@@ -1348,6 +1379,8 @@ sub output_options {
               description => 'HTML'},
              {value       => 'excel',
               description => 'Excel'},
+             {value       => 'source',
+              description => 'Show Source'},
 #             {value       => 'xml',
 #              description => 'XML'},
              {value       => 'csv',
@@ -1521,6 +1554,7 @@ sub outsheet_xml   {
     ## Will be rendered for the user
     ## But not on this day
     my $Str = '<spreadsheet type="'.$self->{'type'}.'">'."\n";
+    $self->check_formulas_loaded();
     while (my ($cell,$formula) = each(%{$self->{'formulas'}})) {
         if ($cell =~ /^template_(\w+)/) {
             my $col = $1;
@@ -1611,6 +1645,10 @@ sub load {
     my ($formulas);
     if (exists($spreadsheets{$cachekey})) {
         $formulas = $spreadsheets{$cachekey}->{'formulas'};
+	$self->formulas($formulas);
+        $self->{'row_source'}=$spreadsheets{$cachekey}->{'row_source'};
+        $self->{'row_numbers'}=$spreadsheets{$cachekey}->{'row_numbers'};
+        $self->{'maxrow'}=$spreadsheets{$cachekey}->{'maxrow'};
     } else {
         # Not cached, need to read
         if (! defined($filename)) {
@@ -1644,17 +1682,38 @@ sub load {
                 $formulas = $self->load_system_default_sheet();
             }
         }
-        $filename=$self->filename(); # filename may have changed
-        $cachekey = join('_',($cnum,$cdom,$stype,$filename));
-        %{$spreadsheets{$cachekey}->{'formulas'}} = %{$formulas};
-    }
-    $self->formulas($formulas);
-    $self->set_row_sources();
-    $self->set_row_numbers();
+	$self->formulas($formulas);
+	$self->set_row_sources();
+	$self->set_row_numbers();
+	$self->cache_sheet($formulas);
+    }
+}
+
+sub cache_sheet {
+    my $self = shift;
+    my ($formulas) = @_;
+    my $stype = $self->{'type'};
+    my $cnum  = $self->{'cnum'};
+    my $cdom  = $self->{'cdom'};
+    #
+    my $filename = $self->filename();
+    my $cachekey = join('_',($cnum,$cdom,$stype,$filename));
+
+    if (ref($formulas) eq 'HASH') {
+	%{$spreadsheets{$cachekey}->{'formulas'}} = %{$formulas};
+    }
+    if (ref($self->{'row_source'})) {
+	%{$spreadsheets{$cachekey}->{'row_source'}} =%{$self->{'row_source'}};
+    }
+    if (ref($self->{'row_numbers'})) {
+	%{$spreadsheets{$cachekey}->{'row_numbers'}}=%{$self->{'row_numbers'}};
+    }
+    $spreadsheets{$cachekey}->{'maxrow'} = $self->{'maxrow'};
 }
 
 sub set_row_sources {
     my $self = shift;
+    $self->check_formulas_loaded();
     while (my ($cell,$value) = each(%{$self->{'formulas'}})) {
         next if ($cell !~ /^A(\d+)/ || $1 < 1);
         my $row = $1;
@@ -1665,6 +1724,7 @@ sub set_row_sources {
 
 sub set_row_numbers {
     my $self = shift;
+    $self->check_formulas_loaded();
     while (my ($cell,$value) = each(%{$self->{'formulas'}})) {
 	next if ($cell !~ /^A(\d+)$/);
         next if (! defined($value));
@@ -1700,9 +1760,8 @@ sub save {
         my $cnum  = $self->{'cnum'};
         my $cdom  = $self->{'cdom'};
         my $filename    = $self->{'filename'};
-        my $cachekey = join('_',($cnum,$cdom,$stype,$filename));
         # Cache new sheet
-        %{$spreadsheets{$cachekey}->{'formulas'}}=%f;
+	$self->cache_sheet(\%f);
         # Write sheet
         foreach (keys(%f)) {
             delete($f{$_}) if ($f{$_} eq 'import');
@@ -1718,6 +1777,8 @@ sub save {
                                 {'spreadsheet_default_'.$stype => $filename },
                                           $cdom,$cnum);
             return $reply if ($reply ne 'ok');
+	    &Apache::lonnet::appenv('course.'.$self->{'cid'}.'.spreadsheet_default_'.
+				    $self->{'type'} => $self->filename());
         } 
         if ($self->is_default()) {
             if ($self->{'type'} eq 'studentcalc') {