Return to run.pm CVS log

Up to [LON-CAPA] / loncom / xml

- should only create 1 merror message to the instructor

    1: package Apache::run;
    2: #
    3: # $Id: run.pm,v 1.23 2002/02/15 21:33:12 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:   return $result
   48: }
   49: 
   50: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
   51:   my %oldexpressions=();
   52:   while (!$oldexpressions{$_}) {
   53:     $oldexpressions{$_}=1;
   54:     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
   55:   }
   56: ENDEVALUATE
   57: 
   58: sub evaluate {
   59:   my ($expression,$safeeval,$decls) = @_;
   60:   unless (defined($expression)) { return ''; }
   61:   if (!$Apache::lonxml::evaluate) { return $expression; }
   62:   my $result = '';
   63:   $@='';
   64:   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
   65: 		   "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
   66: #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
   67:   if ($@ eq '') {
   68:     $result = $safeeval->reval('return $_;');
   69:     chomp $result;
   70:   } else {
   71:     &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");
   72:   }  
   73:   return $result
   74: }
   75: 
   76: sub run {
   77:   my ($code,$safeeval,$hideerrors) = @_;
   78: #  print "inside run\n";
   79:   $@='';
   80:   my (@result)=$safeeval->reval($code);
   81:   if ($@ ne '' && !$hideerrors) {
   82:     &Apache::lonxml::error(":$@: occured while running :$code:");
   83:   }
   84:   if ( $#result < '1') {
   85:     return $result[0];
   86:   } else {
   87:     &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
   88:     return (@result);
   89:   }
   90: }
   91: 
   92: sub dump {
   93:   my ($target,$safeeval)=@_;
   94:   my $dump='';
   95:   foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
   96:     if (($symname!~/^\_/) && ($symname!~/\:$/)) {
   97:       if ($safeeval->reval('defined($'.$symname.')')) {
   98: 	$dump.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
   99:       }	
  100:       if ($safeeval->reval('defined(@'.$symname.')')) {
  101: 	$dump.='@'.$symname.'=('.
  102: 	  $safeeval->reval('join(",",@'.$symname.')').")\n";
  103:       }
  104:       if ($safeeval->reval('defined(%'.$symname.')')) {
  105: 	$dump.='%'.$symname.'=(';
  106: 	$dump.=$safeeval->reval('join(",",map { $_."=>".$'.
  107: 				$symname.'{$_} } sort keys %'.
  108: 				$symname.')').")\n";
  109:       }
  110:     }
  111:   }
  112:   $dump.='';
  113:   return $dump;
  114: }
  115: 
  116: 1;
  117: __END__;