--- loncom/interface/Attic/lonspreadsheet.pm	2000/12/04 19:38:35	1.3
+++ loncom/interface/Attic/lonspreadsheet.pm	2000/12/11 18:33:24	1.13
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Spreadsheet/Grades Display Handler
 #
-# 11/11,11/15,11/27,12/04 Gerd Kortemeyer
+# 11/11,11/15,11/27,12/04,12/05,12/06,12/07,12/08,12/09,12/11 Gerd Kortemeyer
 
 package Apache::lonspreadsheet;
 
@@ -10,40 +10,79 @@ use Safe;
 use Safe::Hole;
 use Opcode;
 use Apache::lonnet;
-use Apache::Constants qw(:common);
+use Apache::Constants qw(:common :http);
 use HTML::TokeParser;
+use GDBM_File;
 
 #
-# f: formulas
-# t: intermediate format (from f after sett)
-# v: output values (from t after calcv)
+# These cache hashes need to be independent of user, resource and course
+# (user and course are in the keys)
 #
+use vars qw(%spreadsheets %courserdatas %userrdatas);
+#
+# These global hashes are dependent on user, course and resource, 
+# and need to be initialized every time when a sheet is calculated
+#
+my %courseopt;
+my %useropt;
+my %parmhash;
+my $csec;
+my $uname;
+my $udom;
 
-use vars qw(%v %t %f);
-
+# =============================================================================
+# ===================================== Implements an instance of a spreadsheet
 
-sub deffunc {
-    my $safeeval=shift;
+sub initsheet {
+    my $safeeval = new Safe;
+    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');
     my $code=<<'ENDDEFS';
 # ---------------------------------------------------- Inside of the safe space
 
+#
+# f: formulas
+# t: intermediate format (variable references expanded)
+# v: output values
+# c: preloaded constants (A-column)
+# rl: row label
+
+%v=(); 
+%t=();
+%f=();
+%c=();
+%rl=();
+
+$maxrow=0;
+$sheettype='';
+$filename='';
+
 sub mask {
     my ($lower,$upper)=@_;
 
-    $lower=~/([A-Z]|\*)(\d+|\*)/;
+    $lower=~/([A-Za-z]|\*)(\d+|\*)/;
     my $la=$1;
     my $ld=$2;
 
-    $upper=~/([A-Z]|\*)(\d+|\*)/;
+    $upper=~/([A-Za-z]|\*)(\d+|\*)/;
     my $ua=$1;
     my $ud=$2;
     my $alpha='';
     my $num='';
 
     if (($la eq '*') || ($ua eq '*')) {
-       $alpha='[A-Z]';
+       $alpha='[A-Za-z]';
     } else {
-       $alpha='['.$la.'-'.$ua.']';
+       if (($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 '*')) {
@@ -65,11 +104,13 @@ sub mask {
        } else {
            my @lda=($ld=~m/\d/g);
            my @uda=($ud=~m/\d/g);
-           my $i; $j=0;
-           for ($i=0;$i<=$#lda;$i++) {
+           my $i; $j=0; $notdone=1;
+           for ($i=0;($i<=$#lda)&&($notdone);$i++) {
                if ($lda[$i]==$uda[$i]) {
 		   $num.=$lda[$i];
                    $j=$i;
+               } else {
+                   $notdone=0;
                }
            }
            if ($j<$#lda-1) {
@@ -87,14 +128,15 @@ sub mask {
                }
                $num.=')';
            } else {
-               $num.='['.$lda[$#lda].'-'.$uda[$#uda].']';
+               if ($lda[$#lda]!=$uda[$#uda]) {
+                  $num.='['.$lda[$#lda].'-'.$uda[$#uda].']';
+	       }
            }
        }
     }
-    return '^'.$alpha.$num.'$';
+    return '^'.$alpha.$num."\$";
 }
 
-
 sub NUM {
     my $mask=mask(@_);
     my $num=0;
@@ -215,37 +257,33 @@ sub SUMMIN {
     return $sum;   
 }
 
-
-# ------------------------------------------- End of "Inside of the safe space"
-ENDDEFS
-    $safeeval->reval($code);
-}
-
-# --------------------------------------------------------- Initialize t from f
-
 sub sett {
     %t=();
     map {
 	if ($f{$_}) {
-	    $t{$_}=$f{$_};
-            $t{$_}=~s/\.+/\,/g;
-            $t{$_}=~s/(^|[^\"\'])([A-Z]\d+)/$1\$v\{\'$2\'\}/g;
+            if ($_=~/^A/) {
+	        unless ($f{$_}=~/^\!/) {
+		    $t{$_}=$c{$_};
+                }
+            } else {
+	       $t{$_}=$f{$_};
+               $t{$_}=~s/\.\.+/\,/g;
+               $t{$_}=~s/(^|[^\"\'])([A-Za-z]\d+)/$1\$v\{\'$2\'\}/g;
+            }
         }
     } keys %f;
 }
 
-# ------------------------------------------------------------ Calculate values
-
-sub calcv {
-    my $safeeval=shift;
+sub calc {
     %v=();
+    &sett();
     my $notfinished=1;
     my $depth=0;
     while ($notfinished) {
 	$notfinished=0;
         map {
             my $old=$v{$_};
-            $v{$_}=$safeeval->reval($t{$_});
+            $v{$_}=eval($t{$_});
 	    if ($@) {
 		%v=();
                 return $@;
@@ -261,18 +299,188 @@ sub calcv {
     return '';
 }
 
-# ------------------------------------------------------------ Read spreadsheet
+sub outrow {
+    my $n=shift;
+    my @cols=();
+    if ($n) {
+       $cols[0]=$rl{$f{'A'.$n}};
+    } else {
+       $cols[0]='<b><font size=+1>Export</font></b>';
+    }
+    map {
+        my $fm=$f{$_.$n};
+        $fm=~s/[\'\"]/\&\#34;/g;
+        $cols[$#cols+1]="'$_$n','$fm'".'___eq___'.$v{$_.$n};
+    } ('A','B','C','D','E','F','G','H','I','J','K','L','M',
+       'N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
+       'a','b','c','d','e','f','g','h','i','j','k','l','m',
+       'n','o','p','q','r','s','t','u','v','w','x','y','z');
+    return @cols;
+}
 
-sub readf {
-    my $fn=shift;
-    %f=();
-    my $content;
-    {
-      my $fh=Apache::File->new($fn);
-      $content=join('',<$fh>);
+# ------------------------------------------- End of "Inside of the safe space"
+ENDDEFS
+    $safeeval->reval($code);
+    return $safeeval;
+}
+
+# ------------------------------------------------ Add or change formula values
+
+sub setformulas {
+    my ($safeeval,@f)=@_;
+    $safeeval->reval('%f='."('".join("','",@f)."');");
+}
+
+# ------------------------------------------------ Add or change formula values
+
+sub setconstants {
+    my ($safeeval,@c)=@_;
+    $safeeval->reval('%c='."('".join("','",@c)."');");
+}
+
+# ------------------------------------------------ Add or change formula values
+
+sub setrowlabels {
+    my ($safeeval,@rl)=@_;
+    $safeeval->reval('%rl='."('".join("','",@rl)."');");
+}
+
+# ------------------------------------------------------- Calculate spreadsheet
+
+sub calcsheet {
+    my $safeeval=shift;
+    $safeeval->reval('&calc();');
+}
+
+# ------------------------------------------------------------------ Get values
+
+sub getvalues {
+    my $safeeval=shift;
+    return $safeeval->reval('%v');
+}
+
+# ---------------------------------------------------------------- Get formulas
+
+sub getformulas {
+    my $safeeval=shift;
+    return $safeeval->reval('%f');
+}
+
+# -------------------------------------------------------------------- Set type
+
+sub settype {
+    my ($safeeval,$type)=@_;
+    $safeeval->reval('$sheettype="'.$type.'";');
+}
+
+# -------------------------------------------------------------------- Get type
+
+sub gettype {
+    my $safeeval=shift;
+    return $safeeval->reval('$sheettype');
+}
+# ------------------------------------------------------------------ Set maxrow
+
+sub setmaxrow {
+    my ($safeeval,$row)=@_;
+    $safeeval->reval('$maxrow='.$row.';');
+}
+
+# ------------------------------------------------------------------ Get maxrow
+
+sub getmaxrow {
+    my $safeeval=shift;
+    return $safeeval->reval('$maxrow');
+}
+
+# ---------------------------------------------------------------- Set filename
+
+sub setfilename {
+    my ($safeeval,$fn)=@_;
+    $safeeval->reval('$filename="'.$fn.'";');
+}
+
+# ---------------------------------------------------------------- Get filename
+
+sub getfilename {
+    my $safeeval=shift;
+    return $safeeval->reval('$filename');
+}
+    
+# ========================================================== End of Spreadsheet
+# =============================================================================
+
+
+# --------------------------------------------- Produce output row n from sheet
+
+sub rown {
+    my ($safeeval,$n)=@_;
+    my $defaultbg=((($n-1)/5)==int(($n-1)/5))?'#E0E0':'#FFFF';
+    my $rowdata="\n<tr><td><b><font size=+1>$n</font></b></td>";
+    my $showf=0;
+    map {
+       my $bgcolor=$defaultbg.((($showf-1)/5==int(($showf-1)/5))?'99':'DD');
+       my ($fm,$vl)=split(/\_\_\_eq\_\_\_/,$_);
+       if ($showf==0) { $vl=$_; }
+       if ($showf<=1) { $bgcolor='#FFDDDD'; }
+       if (($n==0) && ($showf<=26)) { $bgcolor='#CCCCFF'; } 
+       if ($showf>1) {
+	   if ($vl eq '') {
+	       $vl='<font size=+2 color='.$bgcolor.'>&#35;</font>';
+           }
+           $rowdata.=
+       '<td bgcolor='.$bgcolor.'><a href="javascript:celledit('.$fm.');">'.$vl.
+	       '</a></td>';
+       } else {
+           $rowdata.='<td bgcolor='.$bgcolor.'>&nbsp;'.$vl.'&nbsp;</td>';
+       }
+       $showf++;
+    } $safeeval->reval('&outrow('.$n.')');
+    return $rowdata.'</tr>';
+}
+
+# ------------------------------------------------------------- Print out sheet
+
+sub outsheet {
+    my $safeeval=shift;
+    my $tabledata='<table border=2><tr><td colspan=2>&nbsp;</td>'.
+                  '<td bgcolor=#FFDDDD><b>A Import</b></td>';
+    map {
+        $tabledata.="<td><b><font size=+1>$_</font></b></td>";
+    } ('B','C','D','E','F','G','H','I','J','K','L','M',
+       'N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
+       'a','b','c','d','e','f','g','h','i','j','k','l','m',
+       'n','o','p','q','r','s','t','u','v','w','x','y','z');
+    $tabledata.='</tr>';
+    my $row;
+    my $maxrow=&getmaxrow($safeeval);
+    for ($row=0;$row<=$maxrow;$row++) {
+        $tabledata.=&rown($safeeval,$row);
+    }
+    $tabledata.='</table>';
+}
+
+
+
+# --------------------------------------- Read spreadsheet formulas from a file
+
+sub readsheet {
+    my ($safeeval,$fn)=@_;
+    &setfilename($safeeval,$fn);
+    $fn=~/\.(\w+)/;
+    &settype($safeeval,$1);
+    my %f=();
+    unless ($spreadsheets{$fn}) {
+       $spreadsheets{$fn}='';
+       {
+         my $fh;
+         if ($fh=Apache::File->new($fn)) {
+            $spreadsheets{$fn}=join('',<$fh>);
+         }
+       }
     }
     {
-      my $parser=HTML::TokeParser->new(\$content);
+      my $parser=HTML::TokeParser->new(\$spreadsheets{$fn});
       my $token;
       while ($token=$parser->get_token) {
          if ($token->[0] eq 'S') {
@@ -283,6 +491,42 @@ sub readf {
          }
       }
     }
+    &setformulas($safeeval,%f);
+}
+
+# ----------------------------------------------- Make a temp copy of the sheet
+
+sub tmpwrite {
+    my ($safeeval,$tmpdir,$symb)=@_;
+    my $fn=$uname.'_'.$udom.'_spreadsheet_'.&getfilename($safeeval);
+    $fn=~s/\W/\_/g;
+    $fn=$tmpdir.$fn.'.tmp';
+    my $fh;
+    if ($fh=Apache::File->new('>'.$fn)) {
+	print $fh join("\n",&getformulas($safeeval));
+    }
+}
+
+# ---------------------------------------------------------- Read the temp copy
+
+sub tmpread {
+    my ($safeeval,$tmpdir,$symb,$nfield,$nform)=@_;
+    my $fn=$uname.'_'.$udom.'_spreadsheet_'.&getfilename($safeeval);
+    $fn=~s/\W/\_/g;
+    $fn=$tmpdir.$fn.'.tmp';
+    my $fh;
+    my %fo=();
+    if ($fh=Apache::File->new($fn)) {
+        my $name;
+        while ($name=<$fh>) {
+	    chomp($name);
+            my $value=<$fh>;
+            chomp($value);
+            $fo{$name}=$value;
+        }
+    }
+    $fo{$nfield}=$nform;
+    &setformulas($safeeval,%fo);
 }
 
 # --------------------------------------------------------------- Read metadata
@@ -312,66 +556,409 @@ sub readmeta {
     return %returnhash;
 }
 
+# ================================================================== Parameters
+# -------------------------------------------- Figure out a cascading parameter
 
-# ------------------------------------------------------------ Returns safeeval
+sub parmval {
+    my ($what,$symb)=@_;
 
-sub init {
+    unless ($symb) { return ''; }
+    my $result='';
 
-    %v=();
-    %t=();
-    %f=();
-    my $safeeval = new Safe;
-    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');
-    $safeeval->share('%v','%t','%f');
-    &deffunc($safeeval);
+    my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
+# ----------------------------------------------------- Cascading lookup scheme
+       my $rwhat=$what;
+       $what=~s/^parameter\_//;
+       $what=~s/\_/\./;
+
+       my $symbparm=$symb.'.'.$what;
+       my $mapparm=$mapname.'___(all).'.$what;
+
+       my $seclevel=
+            $ENV{'request.course.id'}.'.['.
+		$csec.'].'.$what;
+       my $seclevelr=
+            $ENV{'request.course.id'}.'.['.
+		$csec.'].'.$symbparm;
+       my $seclevelm=
+            $ENV{'request.course.id'}.'.['.
+		$csec.'].'.$mapparm;
+
+       my $courselevel=
+            $ENV{'request.course.id'}.'.'.$what;
+       my $courselevelr=
+            $ENV{'request.course.id'}.'.'.$symbparm;
+       my $courselevelm=
+            $ENV{'request.course.id'}.'.'.$mapparm;
+
+# ---------------------------------------------------------- fourth, check user
+      
+      if ($uname) { 
 
-    return $safeeval;
+       if ($useropt{$courselevelr}) { return $useropt{$courselevelr}; }
+
+       if ($useropt{$courselevelm}) { return $useropt{$courselevelm}; }
+
+       if ($useropt{$courselevel}) { return $useropt{$courselevel}; }
+
+      }
+
+# --------------------------------------------------------- third, check course
+     
+       if ($csec) {
+ 
+        if ($courseopt{$seclevelr}) { return $courseopt{$seclevelr}; }
+
+        if ($courseopt{$seclevelm}) { return $courseopt{$seclevelm}; }  
+
+        if ($courseopt{$seclevel}) { return $courseopt{$seclevel}; }
+  
+      }
+
+       if ($courseopt{$courselevelr}) { return $courseopt{$courselevelr}; }
+
+       if ($courseopt{$courselevelm}) { return $courseopt{$courselevelm}; }
+
+       if ($courseopt{$courselevel}) { return $courseopt{$courselevel}; }
+
+# ----------------------------------------------------- second, check map parms
+
+       my $thisparm=$parmhash{$symbparm};
+       if ($thisparm) { return $thisparm; }
+
+# -------------------------------------------------------- first, check default
+
+       return &Apache::lonnet::metadata($fn,$rwhat.'.default');
+        
 }
 
-# -----------------------------------------------------------------------------
 
-sub handler {
+# ----------------------------------------------------------------- Update rows
+
+sub updaterows {
+    my $safeeval=shift;
+    my %bighash;
+# -------------------------------------------------------------------- Tie hash
+      if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
+                       &GDBM_READER,0640)) {
+# --------------------------------------------------------- Get all assessments
+
+	my %allkeys=();
+        my %allassess=();
+
+        my $stype=&gettype($safeeval);
 
+        map {
+	    if ($_=~/^src\_(\d+)\.(\d+)$/) {
+	       my $mapid=$1;
+               my $resid=$2;
+               my $id=$mapid.'.'.$resid;
+               my $srcf=$bighash{$_};
+               if ($srcf=~/\.(problem|exam|quiz|assess|survey|form)$/) {
+                 my $symb=
+                     &Apache::lonnet::declutter($bighash{'map_id_'.$mapid}).
+			    '___'.$resid.'___'.
+			    &Apache::lonnet::declutter($srcf);
+		 $allassess{$symb}=$bighash{'title_'.$id};
+
+                 if ($stype eq 'assesscalc') {
+                   map {
+                       if (($_=~/^stores\_(.*)/) || ($_=~/^parameter\_(.*)/)) {
+			  my $key=$_;
+                          my $display=
+			      &Apache::lonnet::metadata($srcf,$key.'.display');
+                          unless ($display) {
+                              $display=
+			         &Apache::lonnet::metadata($srcf,$key.'.name');
+                          }
+                          $allkeys{$key}=$display;
+		       }
+                   } split(/\,/,&Apache::lonnet::metadata($srcf,'keys'));
+	         }
+	      }
+	   }
+        } keys %bighash;
+        untie(%bighash);
+    
+#
+# %allkeys has a list of storage and parameter displays by unikey
+# %allassess has a list of all resource displays by symb
+#
+# -------------------- Find discrepancies between the course row table and this
+#
+        my %f=&getformulas($safeeval);
+        my $changed=0;
+
+        my %current=();
+        if ($stype eq 'assesscalc') {
+	    %current=%allkeys;
+        } elsif ($stype eq 'studentcalc') {
+            %current=%allassess;
+        }
+
+        my $maxrow=0;
+        my %existing=();
+
+# ----------------------------------------------------------- Now obsolete rows
+	map {
+	    if ($_=~/^A(\d+)/) {
+                $maxrow=($1>$maxrow)?$1:$maxrow;
+                $existing{$f{$_}}=1;
+		unless (defined($current{$f{$_}})) {
+		   $f{$_}='!!! Obsolete';
+                   $changed=1;
+                }
+            }
+        } keys %f;
+
+# -------------------------------------------------------- New and unknown keys
+     
+        map {
+            unless ($existing{$_}) {
+		$changed=1;
+                $maxrow++;
+                $f{'A'.$maxrow}=$_;
+            }
+        } keys %current;        
+     
+        if ($changed) { &setformulas($safeeval,%f); }
+
+        &setmaxrow($safeeval,$maxrow);
+        &setrowlabels($safeeval,%current);
+
+    } else {
+        return 'Could not access course data';
+    }
+}
+
+# ------------------------------------------------ Load data for one assessment
+
+sub rowaassess {
+    my ($safeeval,$symb)=@_;
+    my $uhome=&Apache::lonnet::homeserver($uname,$udom);
+    my $namespace;
+    unless ($namespace=$ENV{'request.course.id'}) { return ''; }
+
+# ----------------------------------------------------------- Get stored values
+    my $answer=&Apache::lonnet::reply(
+       "restore:$udom:$uname:$namespace:$symb",$uhome);
+    my %returnhash=();
+    map {
+	my ($name,$value)=split(/\=/,$_);
+        $returnhash{&Apache::lonnet::unescape($name)}=
+                    &Apache::lonnet::unescape($value);
+    } split(/\&/,$answer);
+    my $version;
+    for ($version=1;$version<=$returnhash{'version'};$version++) {
+       map {
+          $returnhash{$_}=$returnhash{$version.':'.$_};
+       } split(/\:/,$returnhash{$version.':keys'});
+    }
+# ----------------------------- returnhash now has all stores for this resource
+
+# ---------------------------- initialize coursedata and userdata for this user
+    %courseopt=();
+    %useropt=();
+    my $uhome=&Apache::lonnet::homeserver($uname,$udom);
+    unless ($uhome eq 'no_host') { 
+# -------------------------------------------------------------- Get coursedata
+      unless
+        ((time-$courserdatas{$ENV{'request.course.id'}.'.last_cache'})<120) {
+         my $reply=&Apache::lonnet::reply('dump:'.
+              $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
+              $ENV{'course.'.$ENV{'request.course.id'}.'.num'}.':resourcedata',
+              $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
+         if ($reply!~/^error\:/) {
+            $courserdatas{$ENV{'request.course.id'}}=$reply;
+            $courserdatas{$ENV{'request.course.id'}.'.last_cache'}=time;
+         }
+      }
+      map {
+         my ($name,$value)=split(/\=/,$_);
+         $courseopt{&Apache::lonnet::unescape($name)}=
+                    &Apache::lonnet::unescape($value);  
+      } split(/\&/,$courserdatas{$ENV{'request.course.id'}});
+# --------------------------------------------------- Get userdata (if present)
+      unless
+        ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<120) {
+         my $reply=
+       &Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
+         if ($reply!~/^error\:/) {
+	     $userrdatas{$uname.'___'.$udom}=$reply;
+	     $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
+         }
+      }
+      map {
+         my ($name,$value)=split(/\=/,$_);
+         $useropt{&Apache::lonnet::unescape($name)}=
+                  &Apache::lonnet::unescape($value);
+      } split(/\&/,$userrdatas{$uname.'___'.$udom});
+   }
+# -- now courseopt, useropt initialized for this user and course (used parmval)
+
+    my %c=();
+    my %f=&getformulas($safeeval);
+    map {
+	if ($_=~/^A/) {
+            unless ($f{$_}=~/^\!/) {
+  	       if ($f{$_}=~/^parameter/) {
+	          $c{$_}=&parmval($f{$_},$symb);
+	       } else {
+ 	          $c{$_}=$returnhash{$f{$_}};
+	       }
+	   }
+        }
+    } keys %f;
+
+    &setconstants($safeeval,%c);
+}
+
+# --------------------------------------------------------- Various form fields
+
+sub textfield {
+    my ($title,$name,$value)=@_;
+    return "\n<p><b>$title:</b><br>".
+           '<input type=text name="'.$name.'" size=80 value="'.$value.'">';
+}
+
+sub hiddenfield {
+    my ($name,$value)=@_;
+    return "\n".'<input type=hidden name="'.$name.'" value="'.$value.'">';
+}
+
+sub selectbox {
+    my ($title,$name,$value,%options)=@_;
+    my $selout="\n<p><b>$title:</b><br>".'<select name="'.$name.'">';
+    map {
+        $selout.='<option value="'.$_.'"';
+        if ($_ eq $value) { $selout.=' selected'; }
+        $selout.='>'.$options{$_}.'</option>';
+    } sort keys %options;
+    return $selout.'</select>';
+}
+
+# ==================================== Sub handler to get export of assessments
+
+# ================================================================ Main handler
+
+sub handler {
     my $r=shift;
 
-  $r->content_type('text/html');
-  $r->send_http_header;
+    $uname='';
+    $udom='';
+    $csec='';
+
+   if ($r->header_only) {
+      $r->content_type('text/html');
+      $r->send_http_header;
+      return OK;
+   }
+
+# ----------------------------------------------------- Needs to be in a course
+
+  if (($ENV{'request.course.fn'}) || 
+      ($ENV{'request.state'} eq 'construct')) { 
+
+# --------------------------- Get query string for limited number of parameters
+    map {
+       my ($name, $value) = split(/=/,$_);
+       $value =~ tr/+/ /;
+       $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
+       if (($name eq 'uname') || ($name eq 'udom') || ($name eq 'usymb')) {
+           unless ($ENV{'form.'.$name}) {
+              $ENV{'form.'.$name}=$value;
+	   }
+       }
+    } (split(/&/,$ENV{'QUERY_STRING'}));
 
-  $r->print('<html><head><title>LON-CAPA Spreadsheet</title></head>');
-  $r->print('<body bgcolor="#FFFFFF">');
- 
-    my $safeeval=init();
+# ------------------------------------------- Nothing there? Must be login user
 
-    $f{'A3'}=5;
-    $f{'A4'}=3;
-    $f{'A5'}=8;
-    $f{'E100'}=5;
-    $f{'C3'}='A3+6';
-    $f{'B4'}='8+int(C3/3)';
-    $f{'C7'}='A3+B4';
-    $f{'G8'}='MEAN("E*")';
-    $f{'G5'}='A3+SUMMIN(2,"A*")';
-    $f{'G6'}='A3+SUM("A*")';
-    $f{'G7'}='STDDEV("A*")';
-    $f{'G9'}='NUM("G*")';
-    $f{'H10'}='MEAN("E*")';
-    $f{'G10'}='BIN(3,5,"A*")';
-    &sett();
-    $r->print(&calcv($safeeval)."\n");
-    $r->print($v{'C7'}."\n");
-    $r->print($t{'G5'}.' - '.$v{'G5'}."\n");
-    $r->print($t{'G6'}.' - '.$v{'G6'}."\n");
-    $r->print($t{'G7'}.' - '.$v{'G7'}."\n");
-    $r->print($t{'G8'}.' - '.$v{'G8'}."\n");
-    $r->print($t{'G9'}.' - '.$v{'G9'}."\n");
-    $r->print($t{'G10'}.' - '.$v{'G10'}."\n");
+    unless ($ENV{'form.uname'}) {
+	$uname=$ENV{'user.name'};
+        $udom=$ENV{'user.domain'};
+    } else {
+        $uname=$ENV{'form.uname'};
+        $udom=$ENV{'form.udom'};
+    }
+# ------------------------------------------------------------------- Open page
+
+    $r->content_type('text/html');
+    $r->header_out('Cache-control','no-cache');
+    $r->header_out('Pragma','no-cache');
+    $r->send_http_header;
+
+    $r->print('<html><head><title>LON-CAPA Spreadsheet</title>');
+    $r->print(<<ENDSCRIPT);
+<script language="JavaScript">
+
+    function celledit(cn,cf) {
+        var cnf=prompt(cn,cf);
+	if (cnf!=null) {
+	    document.sheet.unewfield.value=cn;
+            document.sheet.unewformula.value=cnf;
+            document.sheet.submit();
+        }
+    }
+
+</script>
+ENDSCRIPT
+    $r->print('</head><body bgcolor="#FFFFFF">'.
+       '<form action="'.$r->uri.'" name=sheet method=post>'.
+       &hiddenfield('uname',$ENV{'form.uname'}).
+       &hiddenfield('udom',$ENV{'form.udom'}).
+       &hiddenfield('usymb',$ENV{'form.usymb'}).
+       &hiddenfield('unewfield','').
+       &hiddenfield('unewformula',''));
+    my $sheetone=initsheet();
+    if ($ENV{'form.unewfield'}) {
+        $r->print('<h2>Modified Workcopy</h2>');
+        $ENV{'form.unewformula'}=~s/\'/\"/g;
+        $r->print('New formula: '.$ENV{'form.unewfield'}.'='.
+                  $ENV{'form.unewformula'}.'<br>');
+	&tmpread($sheetone,$r->dir_config('lonDaemons').'/tmp/',
+                 $ENV{'form.usymb'},
+                 $ENV{'form.unewfield'},$ENV{'form.unewformula'});
+        &setfilename($sheetone,$r->filename);
+        $r->filename=~/\.(\w+)/;
+        &settype($sheetone,$1);
+    } else {
+        &readsheet($sheetone,$r->filename);
+    }
+    if (tie(%parmhash,'GDBM_File',
+       $ENV{'request.course.fn'}.'_parms.db',&GDBM_READER,0640)) {
+       $csec=&Apache::lonnet::usection($udom,$uname,$ENV{'request.course.id'});
+       if ($csec eq '-1') {
+          $r->print('<h3><font color=red>'.
+   "User '$uname' at domain '$udom' not a student in this course</font></h3>");
+       }
+       &updaterows($sheetone);
+       untie(%parmhash);
+   } else {
+       $r->print('<h3><font color=red>'.
+	   'Could not initialize import fields (not in a course)</font></h3>');
+   }
+   &tmpwrite($sheetone,$r->dir_config('lonDaemons').'/tmp/',
+              $ENV{'form.usymb'});
+    $r->print("<b>User '$uname' at domain '$udom' for '".
+              $ENV{'course.'.$ENV{'request.course.id'}.'.description'}."'");
+    if ($csec) {
+       $r->print(", group/section '$csec'");
+    }
+    $r->print("</b>\n");
+    if (&gettype($sheetone) eq 'assesscalc') {
+	&rowaassess($sheetone,$ENV{'form.usymb'});
+    }
+    &calcsheet($sheetone);
+    $r->print(&outsheet($sheetone));
+
+    $r->print('</form></body></html>');
 
-    $r->print('</body></html>');
+  } else {
+# ----------------------------- Not in a course, or not allowed to modify parms
+      $ENV{'user.error.msg'}=
+        $r->uri.":opa:0:0:Cannot modify spreadsheet";
+      return HTTP_NOT_ACCEPTABLE; 
+  }
     return OK;
 }