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Up to [LON-CAPA] / loncom / xml

- added code to check for and report errors

    1: package Apache::run;
    2: 
    3: sub evaluate {
    4:   my ($expression,$safeeval,$decls) = @_;
    5: # print "inside2 evaluate $decls with $expression<br>\n";
    6: # gerd's old method interpolates unset vars
    7: # $safeeval->reval('return qq('.$expression.');');
    8:   unless (defined $expression) { return ''; }
    9:   my $result = '';
   10:   $@='';
   11:   $safeeval->reval('$_=\''.$expression.'\';');
   12:   if ($@ eq '') {
   13:     $safeeval->reval('{'.$decls.'$_=~s/(\$\{?[A-Za-z]\w*\}?)/(defined(eval($1))?eval($1):$1)/ge;}');
   14:     if ($@ eq '') {
   15:       $result = $safeeval->reval('return $_;');
   16:     } else {
   17:       &Apache::lonxml::error("substituion on:$expression:with:$decls:caused");
   18:     }
   19:   } else {
   20:     &Apache::lonxml::error("defining:$expression:caused");
   21:   }
   22:   if ($@ ne '') {&Apache::lonxml::error($@);}
   23:   return $result
   24: }
   25: 
   26: sub run {
   27:   my ($code,$safeeval) = @_;
   28: #  print "inside run\n";
   29:   $@='';
   30:   my $result=$safeeval->reval($code);
   31:   if ($@ ne '') { 
   32:     &Apache::lonxml::error(":$code:caused"); 
   33:     &Apache::lonxml::error($@); 
   34:   }
   35:   return $result;
   36: }
   37: 
   38: 1;
   39: __END__;