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- defined needs to use ()

    1: package Apache::run;
    2: #
    3: # $Id: run.pm,v 1.22 2001/12/11 15:48:51 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: sub evaluateold {
   29:   my ($expression,$safeeval,$decls) = @_;
   30: # print "inside2 evaluate $decls with $expression<br />\n";
   31: # gerd's old method interpolates unset vars
   32: # $safeeval->reval('return qq('.$expression.');');
   33:   unless (defined($expression)) { return ''; }
   34:   my $result = '';
   35:   $@='';
   36:   $safeeval->reval('$_=q|'.$expression.'|;');
   37:   if ($@ eq '') {
   38:     $safeeval->reval('{'.$decls.'$_=~s/(\$[A-Za-z]\w*)/(defined(eval($1))?eval($1):$1)/ge;}');
   39:     if ($@ eq '') {
   40:       $result = $safeeval->reval('return $_;');
   41:     } else {
   42:       &Apache::lonxml::error("substitution on:$expression:with:$decls:caused");
   43:     }
   44:   } else {
   45:     &Apache::lonxml::error("defining:$expression:caused");
   46:   }
   47:   if ($@ ne '') {&Apache::lonxml::error($@);}
   48:   return $result
   49: }
   50: 
   51: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
   52:   my %oldexpressions=();
   53:   while (!$oldexpressions{$_}) {
   54:     $oldexpressions{$_}=1;
   55:     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
   56:   }
   57: ENDEVALUATE
   58: 
   59: sub evaluate {
   60:   my ($expression,$safeeval,$decls) = @_;
   61:   unless (defined($expression)) { return ''; }
   62:   if (!$Apache::lonxml::evaluate) { return $expression; }
   63:   my $result = '';
   64:   $@='';
   65:   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
   66: 		   "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
   67: #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
   68:   if ($@ eq '') {
   69:     $result = $safeeval->reval('return $_;');
   70:     chomp $result;
   71:   } else {
   72:     &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");
   73:   }  
   74:   return $result
   75: }
   76: 
   77: sub run {
   78:   my ($code,$safeeval,$hideerrors) = @_;
   79: #  print "inside run\n";
   80:   $@='';
   81:   my (@result)=$safeeval->reval($code);
   82:   if ($@ ne '' && !$hideerrors) {
   83:     &Apache::lonxml::error(":$code:caused");
   84:     &Apache::lonxml::error($@);
   85:   }
   86:   if ( $#result < '1') {
   87:     return $result[0];
   88:   } else {
   89:     &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
   90:     return (@result);
   91:   }
   92: }
   93: 
   94: sub dump {
   95:   my ($target,$safeeval)=@_;
   96:   my $dump='';
   97:   foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
   98:     if (($symname!~/^\_/) && ($symname!~/\:$/)) {
   99:       if ($safeeval->reval('defined($'.$symname.')')) {
  100: 	$dump.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
  101:       }	
  102:       if ($safeeval->reval('defined(@'.$symname.')')) {
  103: 	$dump.='@'.$symname.'=('.
  104: 	  $safeeval->reval('join(",",@'.$symname.')').")\n";
  105:       }
  106:       if ($safeeval->reval('defined(%'.$symname.')')) {
  107: 	$dump.='%'.$symname.'=(';
  108: 	$dump.=$safeeval->reval('join(",",map { $_."=>".$'.
  109: 				$symname.'{$_} } sort keys %'.
  110: 				$symname.')').")\n";
  111:       }
  112:     }
  113:   }
  114:   $dump.='';
  115:   return $dump;
  116: }
  117: 
  118: 1;
  119: __END__;