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Diff for /loncom/xml/run.pm between versions 1.15 and 1.32

version 1.15, 2001/02/19 20:43:00 version 1.32, 2003/03/24 22:43:31
Line 1 Line 1
 package Apache::run;  package Apache::run;
   #
   # $Id$
   #
   # Copyright Michigan State University Board of Trustees
   #
   # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   #
   # LON-CAPA is free software; you can redistribute it and/or modify
   # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   #
   
 sub evaluateold {  use HTML::Entities;
   my ($expression,$safeeval,$decls) = @_;  
 # print "inside2 evaluate $decls with $expression<br />\n";  
 # gerd's old method interpolates unset vars  
 # $safeeval->reval('return qq('.$expression.');');  
   unless (defined $expression) { return ''; }  
   my $result = '';  
   $@='';  
   $safeeval->reval('$_=q|'.$expression.'|;');  
   if ($@ eq '') {  
     $safeeval->reval('{'.$decls.'$_=~s/(\$[A-Za-z]\w*)/(defined(eval($1))?eval($1):$1)/ge;}');  
     if ($@ eq '') {  
       $result = $safeeval->reval('return $_;');  
     } else {  
       &Apache::lonxml::error("substitution on:$expression:with:$decls:caused");  
     }  
   } else {  
     &Apache::lonxml::error("defining:$expression:caused");  
   }  
   if ($@ ne '') {&Apache::lonxml::error($@);}  
   return $result  
 }  
   
 $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';    $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
   my %oldexpressions=();    my %_LONCAPA_INTERNAL_oldexpressions=();
   while (!$oldexpressions{$_}) {    while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
     $oldexpressions{$_}=1;      $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;      $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
       if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
   }    }
 ENDEVALUATE  ENDEVALUATE
   
 sub evaluate {  sub evaluate {
   my ($expression,$safeeval,$decls) = @_;      my ($expression,$safeeval,$decls) = @_;
   unless (defined $expression) { return ''; }      unless (defined($expression)) { return ''; }
   my $result = '';      if ($Apache::lonxml::evaluate < 1) { return $expression; }
   $@='';      my $result = '';
   print $decls      $@='';
   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.      $Apache::run::timeout=0;
    "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');      $main::SIG{'ALRM'} = sub {
 #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');   $Apache::run::timeout=1;
   if ($@ eq '') {   Apache->request->print("timeout<br /> \n");
     $result = $safeeval->reval('return $_;');      };
     chomp $result;      eval {
   } else {   alarm(Apache->request->server->timeout);
     &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
   }     "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
   return $result   alarm(0);
       };
       my $error=$@;
       if ($error eq '' && !$Apache::run::timeout) {
    $result = $safeeval->reval('return $_;');
    chomp $result;
       } else {
    if ($Apache::run::timeout) {
       $error = 'Code ran too long. It ran for more than '.
    Apache->request->server->timeout.' seconds';
    }
    &Apache::lonxml::error('substitution on <pre>'.$expression.
          '</pre> with <pre>'.$decls.
          '</pre> caused <pre>'.$error);
       }
       return $result
 }  }
   
 sub run {  sub run {
   my ($code,$safeeval) = @_;      my ($code,$safeeval,$hideerrors) = @_;
 #  print "inside run\n";      my @result;
   $@='';      $@='';
   my (@result)=$safeeval->reval($code);      $Apache::run::timeout=0;
   if ($@ ne '') {       $main::SIG{'ALRM'} = sub {
     &Apache::lonxml::error(":$code:caused");    $Apache::run::timeout=1;
     &Apache::lonxml::error($@);    Apache->request->print("timeout<br /> \n");
   }      };
   if ( $#result < '1') {      eval {
     return $result[0];   alarm(Apache->request->server->timeout);
   } else {   @result=$safeeval->reval($code);
     &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");   alarm(0);
     return (@result);      };
       my $error=$@;
       if (($Apache::run::timeout || $error ne '') && !$hideerrors) {
    if ($Apache::run::timeout) {
       $error = 'Code ran too long. It ran for more than '.
    Apache->request->server->timeout.' seconds';
    }
    &Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).
          '</pre> occured while running <pre>'.
          &HTML::Entities::encode($code).'</pre>');
       }
       if ( $#result < '1') {
    return $result[0];
       } else {
    &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
    return (@result);
       }
   }
   
   sub dump {
     my ($target,$safeeval)=@_;
     my $dump='';
     foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
       if (($symname!~/^\_/) && ($symname!~/\:$/)) {
         my $line;
         if ($safeeval->reval('defined($'.$symname.')')) {
    $line='$'.$symname.'='.$safeeval->reval('$'.$symname);
         }
         if ($safeeval->reval('defined(@'.$symname.')')) {
    $line='@'.$symname.'=('.
     $safeeval->reval('join(",",@'.$symname.')').")";
         }
         if ($safeeval->reval('defined(%'.$symname.')')) {
    $line='%'.$symname.'=(';
    $line.=$safeeval->reval('join(",",map { $_."=>".$'.
    $symname.'{$_} } sort keys %'.
    $symname.')').")"
         }
         if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />\n"; }
       }
   }    }
     $dump.='';
     return $dump;
 }  }
   
 1;  1;
Removed from v.1.15  
changed lines
  Added in v.1.32

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