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- fixes BUG#494 (Don't interpolate students reponse)

    1: package Apache::run;
    2: #
    3: # $Id: run.pm,v 1.31 2002/06/24 21:23:26 albertel Exp $
    4: #
    5: # Copyright Michigan State University Board of Trustees
    6: #
    7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    8: #
    9: # LON-CAPA is free software; you can redistribute it and/or modify
   10: # it under the terms of the GNU General Public License as published by
   11: # the Free Software Foundation; either version 2 of the License, or
   12: # (at your option) any later version.
   13: #
   14: # LON-CAPA is distributed in the hope that it will be useful,
   15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   17: # GNU General Public License for more details.
   18: #
   19: # You should have received a copy of the GNU General Public License
   20: # along with LON-CAPA; if not, write to the Free Software
   21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   22: #
   23: # /home/httpd/html/adm/gpl.txt
   24: #
   25: # http://www.lon-capa.org/
   26: #
   27: 
   28: use HTML::Entities;
   29: 
   30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
   31:   my %_LONCAPA_INTERNAL_oldexpressions=();
   32:   while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
   33:     $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
   34:     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
   35:     if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
   36:   }
   37: ENDEVALUATE
   38: 
   39: sub evaluate {
   40:   my ($expression,$safeeval,$decls) = @_;
   41:   unless (defined($expression)) { return ''; }
   42:   if ($Apache::lonxml::evaluate < 1) { return $expression; }
   43:   my $result = '';
   44:   $@='';
   45:   if ($Apache::lonxml::request) {
   46:     $Apache::lonxml::request->hard_timeout("Apache::run::run, evaluation $code");
   47:   }
   48:   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
   49: 		   "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
   50:   if ($Apache::lonxml::request) { $Apache::lonxml::request->kill_timeout; }
   51: #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
   52:   my $error=$@;
   53:   if ($@ eq '') {
   54:     $result = $safeeval->reval('return $_;');
   55:     chomp $result;
   56:   } else {
   57:     &Apache::lonxml::error('substitution on <pre>'.$expression.
   58: 			   '</pre> with <pre>'.$decls.
   59: 			   '</pre> caused <pre>'.$error);
   60:   }  
   61:   return $result
   62: }
   63: 
   64: sub run {
   65:   my ($code,$safeeval,$hideerrors) = @_;
   66: #  print "inside run\n";
   67:   $@='';
   68:   if ($Apache::lonxml::request) {
   69:     $Apache::lonxml::request->hard_timeout("Apache::run::run, evaluation $code");
   70:   }
   71:   my (@result)=$safeeval->reval($code);
   72:   if ($Apache::lonxml::request) { $Apache::lonxml::request->kill_timeout; }
   73:   my $error=$@;
   74:   if ($error ne '' && !$hideerrors) {
   75:     &Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).
   76: 			   '</pre> occured while running <pre>'.
   77: 			   &HTML::Entities::encode($code).'</pre>');
   78:   }
   79:   if ( $#result < '1') {
   80:     return $result[0];
   81:   } else {
   82:     &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
   83:     return (@result);
   84:   }
   85: }
   86: 
   87: sub dump {
   88:   my ($target,$safeeval)=@_;
   89:   my $dump='';
   90:   foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
   91:     if (($symname!~/^\_/) && ($symname!~/\:$/)) {
   92:       my $line;
   93:       if ($safeeval->reval('defined($'.$symname.')')) {
   94: 	$line='$'.$symname.'='.$safeeval->reval('$'.$symname);
   95:       }	
   96:       if ($safeeval->reval('defined(@'.$symname.')')) {
   97: 	$line='@'.$symname.'=('.
   98: 	  $safeeval->reval('join(",",@'.$symname.')').")";
   99:       }
  100:       if ($safeeval->reval('defined(%'.$symname.')')) {
  101: 	$line='%'.$symname.'=(';
  102: 	$line.=$safeeval->reval('join(",",map { $_."=>".$'.
  103: 				$symname.'{$_} } sort keys %'.
  104: 				$symname.')').")"
  105:       }
  106:       if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />\n"; }
  107:     }
  108:   }
  109:   $dump.='';
  110:   return $dump;
  111: }
  112: 
  113: 1;
  114: __END__;