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Annotation of loncom/xml/run.pm, revision 1.21

1.2       albertel    1: package Apache::run;
1.21    ! www         2: #
        !             3: # $Id: gplheader.pl,v 1.1 2001/11/29 18:19:27 www 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: #
1.1       sakharuk   27: 
1.10      albertel   28: sub evaluateold {
1.4       albertel   29:   my ($expression,$safeeval,$decls) = @_;
1.15      albertel   30: # print "inside2 evaluate $decls with $expression<br />\n";
1.3       albertel   31: # gerd's old method interpolates unset vars
1.5       albertel   32: # $safeeval->reval('return qq('.$expression.');');
                     33:   unless (defined $expression) { return ''; }
1.7       albertel   34:   my $result = '';
                     35:   $@='';
1.9       sakharuk   36:   $safeeval->reval('$_=q|'.$expression.'|;');
1.7       albertel   37:   if ($@ eq '') {
1.9       sakharuk   38:     $safeeval->reval('{'.$decls.'$_=~s/(\$[A-Za-z]\w*)/(defined(eval($1))?eval($1):$1)/ge;}');
1.7       albertel   39:     if ($@ eq '') {
                     40:       $result = $safeeval->reval('return $_;');
                     41:     } else {
1.10      albertel   42:       &Apache::lonxml::error("substitution on:$expression:with:$decls:caused");
1.7       albertel   43:     }
                     44:   } else {
                     45:     &Apache::lonxml::error("defining:$expression:caused");
                     46:   }
                     47:   if ($@ ne '') {&Apache::lonxml::error($@);}
1.10      albertel   48:   return $result
                     49: }
                     50: 
1.11      albertel   51: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
                     52:   my %oldexpressions=();
                     53:   while (!$oldexpressions{$_}) {
                     54:     $oldexpressions{$_}=1;
1.13      www        55:     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
1.11      albertel   56:   }
                     57: ENDEVALUATE
                     58: 
1.10      albertel   59: sub evaluate {
                     60:   my ($expression,$safeeval,$decls) = @_;
                     61:   unless (defined $expression) { return ''; }
1.16      albertel   62:   if (!$Apache::lonxml::evaluate) { return $expression; }
1.10      albertel   63:   my $result = '';
                     64:   $@='';
1.11      albertel   65:   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
                     66: 		   "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
                     67: #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
1.10      albertel   68:   if ($@ eq '') {
                     69:     $result = $safeeval->reval('return $_;');
1.13      www        70:     chomp $result;
1.10      albertel   71:   } else {
                     72:     &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");
                     73:   }  
1.7       albertel   74:   return $result
1.2       albertel   75: }
                     76: 
                     77: sub run {
1.18      albertel   78:   my ($code,$safeeval,$hideerrors) = @_;
1.3       albertel   79: #  print "inside run\n";
1.7       albertel   80:   $@='';
1.14      albertel   81:   my (@result)=$safeeval->reval($code);
1.18      albertel   82:   if ($@ ne '' && !$hideerrors) {
                     83:     &Apache::lonxml::error(":$code:caused");
                     84:     &Apache::lonxml::error($@);
1.7       albertel   85:   }
1.14      albertel   86:   if ( $#result < '1') {
                     87:     return $result[0];
                     88:   } else {
                     89:     &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
                     90:     return (@result);
                     91:   }
1.2       albertel   92: }
                     93: 
1.19      albertel   94: sub dump {
                     95:   my ($target,$safeeval)=@_;
                     96:   my $dump='';
                     97:   foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
                     98:     if (($symname!~/^\_/) && ($symname!~/\:$/)) {
1.20      albertel   99:       if ($safeeval->reval('defined($'.$symname.')')) {
1.19      albertel  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: 
1.2       albertel  118: 1;
                    119: __END__;