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Annotation of loncom/xml/run.pm, revision 1.27

1.2       albertel    1: package Apache::run;
1.21      www         2: #
1.27    ! albertel    3: # $Id: run.pm,v 1.26 2002/04/10 15:22:02 albertel Exp $
1.21      www         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: #
1.1       sakharuk   27: 
1.26      albertel   28: use HTML::Entities;
                     29: 
1.11      albertel   30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
1.24      albertel   31:   my %_LONCAPA_INTERNAL_oldexpressions=();
                     32:   my $i=0;
                     33:   while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
                     34:     $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
1.13      www        35:     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
1.24      albertel   36:     if ($i++ > 10 ) { last; }
1.11      albertel   37:   }
                     38: ENDEVALUATE
                     39: 
1.10      albertel   40: sub evaluate {
                     41:   my ($expression,$safeeval,$decls) = @_;
1.22      albertel   42:   unless (defined($expression)) { return ''; }
1.16      albertel   43:   if (!$Apache::lonxml::evaluate) { return $expression; }
1.10      albertel   44:   my $result = '';
                     45:   $@='';
1.11      albertel   46:   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
                     47: 		   "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
                     48: #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
1.26      albertel   49:   my $error=$@;
1.10      albertel   50:   if ($@ eq '') {
                     51:     $result = $safeeval->reval('return $_;');
1.13      www        52:     chomp $result;
1.10      albertel   53:   } else {
1.26      albertel   54:     &Apache::lonxml::error('substitution on <pre>'.$expression.
                     55: 			   '</pre> with <pre>'.$decls.
                     56: 			   '</pre> caused <pre>'.$error);
1.10      albertel   57:   }  
1.7       albertel   58:   return $result
1.2       albertel   59: }
                     60: 
                     61: sub run {
1.18      albertel   62:   my ($code,$safeeval,$hideerrors) = @_;
1.3       albertel   63: #  print "inside run\n";
1.7       albertel   64:   $@='';
1.14      albertel   65:   my (@result)=$safeeval->reval($code);
1.26      albertel   66:   my $error=$@;
                     67:   if ($error ne '' && !$hideerrors) {
                     68:     &Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).
                     69: 			   '</pre> occured while running <pre>'.
                     70: 			   &HTML::Entities::encode($code).'</pre>');
1.7       albertel   71:   }
1.14      albertel   72:   if ( $#result < '1') {
                     73:     return $result[0];
                     74:   } else {
                     75:     &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
                     76:     return (@result);
                     77:   }
1.2       albertel   78: }
                     79: 
1.19      albertel   80: sub dump {
                     81:   my ($target,$safeeval)=@_;
                     82:   my $dump='';
                     83:   foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
                     84:     if (($symname!~/^\_/) && ($symname!~/\:$/)) {
1.27    ! albertel   85:       my $line;
1.20      albertel   86:       if ($safeeval->reval('defined($'.$symname.')')) {
1.27    ! albertel   87: 	$line='$'.$symname.'='.$safeeval->reval('$'.$symname);
1.19      albertel   88:       }	
1.22      albertel   89:       if ($safeeval->reval('defined(@'.$symname.')')) {
1.27    ! albertel   90: 	$line='@'.$symname.'=('.
        !            91: 	  $safeeval->reval('join(",",@'.$symname.')').")";
1.19      albertel   92:       }
1.22      albertel   93:       if ($safeeval->reval('defined(%'.$symname.')')) {
1.27    ! albertel   94: 	$line='%'.$symname.'=(';
        !            95: 	$line.=$safeeval->reval('join(",",map { $_."=>".$'.
1.19      albertel   96: 				$symname.'{$_} } sort keys %'.
1.27    ! albertel   97: 				$symname.')').")"
1.19      albertel   98:       }
1.27    ! albertel   99:       if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />\n"; }
1.19      albertel  100:     }
                    101:   }
                    102:   $dump.='';
                    103:   return $dump;
                    104: }
                    105: 
1.2       albertel  106: 1;
                    107: __END__;