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Diff for /loncom/xml/run.pm between versions 1.10 and 1.54

version 1.10, 2000/11/14 22:24:38 version 1.54, 2005/11/15 20:50:26
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";  $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
 # gerd's old method interpolates unset vars  my %_LONCAPA_INTERNAL_oldexpressions=();
 # $safeeval->reval('return qq('.$expression.');');  while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
   unless (defined $expression) { return ''; }      $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
   my $result = '';      $_ =~s/  # $1 will be the variable reference or subroutine name
   $@='';              ((?:\$|\&) #look for a starting $ or &
   $safeeval->reval('$_=q|'.$expression.'|;');               (?:[\#|\$]* #support $$ or $#$ etc.
   if ($@ eq '') {                [A-Za-z][\w]*| # get variable name
     $safeeval->reval('{'.$decls.'$_=~s/(\$[A-Za-z]\w*)/(defined(eval($1))?eval($1):$1)/ge;}');                \{[A-Za-z][\w]*\})) # for ${a}
     if ($@ eq '') {               # $2 is 0 or more array dereferences []
       $result = $safeeval->reval('return $_;');               #             or  hash dereferences {}
     } else {               # the ^$ and ^& is because we do this iteratively
       &Apache::lonxml::error("substitution on:$expression:with:$decls:caused");               #    $a[$c] becomes $a[3] which then evaluates
     }               ([\[\{][^\$\&\]\}]+[\]\}])*?
   } else {               # $3 is the list of arguments
     &Apache::lonxml::error("defining:$expression:caused");               (\([^\$\&\)]+\))*?
   }                  # only match the above if there is not { [ ( coming up
   if ($@ ne '') {&Apache::lonxml::error($@);}                  # Why? (I.e. this fails &a(1)[2]
   return $result                  (?=[^\[\{\(]|$)/
    my ($__LC__a,$__LC__b,$__LC__c)=($1,$2,$3);
    my $__LC__prefix;
    my $__LC__result;
    while (1) {
        { 
    use strict;
    no strict "vars";
    if (eval(defined(eval($__LC__a.$__LC__b)))) {
        $__LC__result= $__LC__prefix.eval($__LC__a.$__LC__b.$__LC__c);
        last;
    }
        }
        $__LC__prefix.=substr($__LC__a,0,1,"");
        if ($__LC__a!~m-^(\$|&|\#)-) { last; }
    }
    if (!defined($__LC__result)) {
        $__LC__result=$__LC__prefix.$__LC__a.$__LC__b.$__LC__c;
    }
    $__LC__result;
                     /sexg;
       if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
 }  }
   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 = '';
   $safeeval->reval('{'.$decls.';&evaluate(q|'.$expression.'|);}');      $@='';
   if ($@ eq '') {      $Apache::run::timeout=0;
     $result = $safeeval->reval('return $_;');      $main::SIG{'ALRM'} = sub {
   } else {   $Apache::run::timeout=1;
     &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");   die("timeout");
   }        };
   return $result      my $innererror;
       eval {
    &Apache::lonxml::start_alarm();
    $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
    "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
    $innererror=$@;
    &Apache::lonxml::end_alarm();
       };
       my $error=$@; 
       if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
    $result = $safeeval->reval('return $_;');
    chomp $result;
       } else {
    if ($Apache::run::timeout) {
       $error = 'Code ran too long. It ran for more than '.
    $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
    }
    &Apache::lonxml::error('substitution on <pre>'.
          &HTML::Entities::encode($expression,'<>&"').
          '</pre> with <pre>'.
          &HTML::Entities::encode($decls,'<>&"').
          '</pre> caused <pre>'.
          &HTML::Entities::encode($error,'<>&"').' '.
          &HTML::Entities::encode($innererror,'<>&"').
          '</pre>');
       }
       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");    $Apache::run::timeout=1;
     &Apache::lonxml::error($@);    die("timeout");
   }      };
   return $result;      my $innererror;
       eval {
    &Apache::lonxml::start_alarm();
    @result=$safeeval->reval($code);
    $innererror=$@;
    &Apache::lonxml::end_alarm();
       };
       my $error=$@;
       if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
    if ($Apache::run::timeout) {
       $error = 'Code ran too long. It ran for more than '.
    $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
    }
    my $errormsg='<pre>'.&HTML::Entities::encode($error,'<>&"').' '.
       &HTML::Entities::encode($innererror,'<>&"').
       '</pre> occured while running <pre>';
    $code=&HTML::Entities::encode($code,'<>&"');
    if ($innererror=~/line (\d+)/) {
       my $linenumber=$1;
       my @code=split("\n",$code);
       $code[$linenumber-1]='<b><font color="red">'.
    $code[$linenumber-1].'</font></b>';
       $code=join("\n",@code);
    }
    &Apache::lonxml::error($errormsg.$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 (($symname!~ /^(INC|SIG)/) && ($symname!~/\027/) &&
       ($symname!~/^\_/) && ($symname!~/\:$/)) {
       my $line;
       if ($safeeval->reval('defined($'.$symname.')')) {
    if ($symname =~ /^\w/) {
       $line.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
    }
       }
       if ($safeeval->reval('defined(@'.$symname.')')) {
    $line.='@'.$symname.'=('.
       $safeeval->reval('join(",",@'.$symname.')').")"."\n";
       }
       if ($safeeval->reval('defined(%'.$symname.')')) {
    $line.='%'.$symname.'=(';
    $line.=$safeeval->reval('join(",",map { $_."=>".$'.
    $symname.'{$_} } sort keys %'.
    $symname.')').")"."\n";
       }
       if ($line ne '') {
    $line=&HTML::Entities::encode($line,'<>&"');
    $line=~s|\n|<br />|g;
    $dump.=$line;
       }
    }
       }
       $dump.='';
       return $dump;
 }  }
   
 1;  1;
Removed from v.1.10  
changed lines
  Added in v.1.54

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