version 1.27, 2002/05/03 22:30:54
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version 1.62, 2013/12/04 15:57:15
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Line 26 package Apache::run;
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Line 26 package Apache::run;
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# |
# |
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use HTML::Entities; |
use HTML::Entities; |
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use Apache::lonlocal; |
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$Apache::run::EVALUATE_STRING=<<'ENDEVALUATE'; |
$Apache::run::EVALUATE_STRING=<<'ENDEVALUATE'; |
my %_LONCAPA_INTERNAL_oldexpressions=(); |
my %_LONCAPA_INTERNAL_oldexpressions=(); |
my $i=0; |
while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) { |
while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) { |
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$_LONCAPA_INTERNAL_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/ # $1 will be the variable reference or subroutine name |
if ($i++ > 10 ) { last; } |
((?:\$|\&) #look for a starting $ or & |
} |
(?:[\#|\$]* #support $$ or $#$ etc. |
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[A-Za-z][\w]*| # get variable name |
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\{[A-Za-z][\w]*\})) # for ${a} |
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# $2 is 0 or more array dereferences [] |
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# or hash dereferences {} |
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# the ^$ and ^& is because we do this iteratively |
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# $a[$c] becomes $a[3] which then evaluates |
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([\[\{][^\$\&\]\}]+[\]\}])*? |
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# $3 is the list of arguments |
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(\([^\$\&\)]+\))*? |
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# only match the above if there is not { [ ( coming up |
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# Why? (I.e. this fails &a(1)[2] |
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(?=[^\[\{\(]|$)/ |
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my ($__LC__a,$__LC__b,$__LC__c)=($1,$2,$3); |
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my $__LC__prefix; |
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my $__LC__result; |
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while (1) { |
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if ($__LC__a =~ m-^&(theta|pi|rho)$-) { last; } |
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{ |
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use strict; |
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no strict "vars"; |
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if (eval(defined(eval($__LC__a.$__LC__b)))) { |
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$__LC__result= $__LC__prefix.eval($__LC__a.$__LC__b.$__LC__c); |
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last; |
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} |
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} |
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$__LC__prefix.=substr($__LC__a,0,1,""); |
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if ($__LC__a!~m-^(\$|&|\#)-) { last; } |
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} |
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if (!defined($__LC__result)) { |
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$__LC__result=$__LC__prefix.$__LC__a.$__LC__b.$__LC__c; |
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} |
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$__LC__result; |
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/sexg; |
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if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;} |
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} |
ENDEVALUATE |
ENDEVALUATE |
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sub evaluate { |
sub evaluate { |
my ($expression,$safeeval,$decls) = @_; |
my ($expression,$safeeval,$decls) = @_; |
unless (defined($expression)) { return ''; } |
unless (defined($expression)) { return ''; } |
if (!$Apache::lonxml::evaluate) { return $expression; } |
if ($Apache::lonxml::evaluate < 1) { return $expression; } |
my $result = ''; |
my $result = ''; |
$@=''; |
$@=''; |
$safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression. |
$Apache::run::timeout=0; |
"\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}'); |
local $main::SIG{'ALRM'} = sub { |
# $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}'); |
$Apache::run::timeout=1; |
my $error=$@; |
die("timeout"); |
if ($@ eq '') { |
}; |
$result = $safeeval->reval('return $_;'); |
my $innererror; |
chomp $result; |
eval { |
} else { |
&Apache::lonxml::start_alarm(); |
&Apache::lonxml::error('substitution on <pre>'.$expression. |
$safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression. |
'</pre> with <pre>'.$decls. |
"\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}'); |
'</pre> caused <pre>'.$error); |
$innererror=$@; |
} |
&Apache::lonxml::end_alarm(); |
return $result |
}; |
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my $error=$@; |
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if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) { |
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$result = $safeeval->reval('return $_;'); |
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chomp $result; |
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} else { |
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if ($Apache::run::timeout) { |
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$error = |
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&mt('Code ran too long. It ran for more than [_1] seconds.', |
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$Apache::lonnet::perlvar{'lonScriptTimeout'}); |
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} |
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&Apache::lonxml::error( |
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&mt('Substitution on [_1] with [_2] caused:', |
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'<pre>'. &HTML::Entities::encode($expression,'<>&"').'</pre>', |
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'<pre>'.&HTML::Entities::encode($decls,'<>&"').'</pre>') |
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.'<br />' |
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.'<pre>'.&HTML::Entities::encode($error,'<>&"').' ' |
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.&HTML::Entities::encode($innererror,'<>&"').'</pre>'); |
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} |
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return $result; |
} |
} |
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sub run { |
sub run { |
my ($code,$safeeval,$hideerrors) = @_; |
my ($code,$safeeval,$hideerrors) = @_; |
# print "inside run\n"; |
my @result; |
$@=''; |
$@=''; |
my (@result)=$safeeval->reval($code); |
$Apache::run::timeout=0; |
my $error=$@; |
local $main::SIG{'ALRM'} = sub { |
if ($error ne '' && !$hideerrors) { |
$Apache::run::timeout=1; |
&Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error). |
die("timeout"); |
'</pre> occured while running <pre>'. |
}; |
&HTML::Entities::encode($code).'</pre>'); |
my $innererror; |
} |
eval { |
if ( $#result < '1') { |
&Apache::lonxml::start_alarm(); |
return $result[0]; |
@result=$safeeval->reval($code); |
} else { |
$innererror=$@; |
&Apache::lonxml::debug("<b>Got lots results</b>:$#result:"); |
&Apache::lonxml::end_alarm(); |
return (@result); |
}; |
} |
my $error=$@; |
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if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) { |
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if ($Apache::run::timeout) { |
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$error = &mt('Code ran too long. It ran for more than [_1] seconds.', |
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$Apache::lonnet::perlvar{'lonScriptTimeout'}); |
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} |
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$code=&HTML::Entities::encode($code,'<>&"'); |
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if ($innererror=~/line (\d+)/) { |
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my $linenumber=$1; |
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my @code=split("\n",$code); |
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if ($linenumber < scalar(@code)) { |
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$code[$linenumber-1]= |
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'<span style="color:red;font-weight:bold;">'. |
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$code[$linenumber-1].'</span>'; |
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} |
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$code=join("\n",@code); |
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} |
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&Apache::lonxml::error( |
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'<pre>'.&HTML::Entities::encode($error,'<>&"').' '. |
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&HTML::Entities::encode($innererror,'<>&"'). |
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'</pre>' |
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.&mt('This occurred while running: [_1]', |
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'<pre>'.$code.'</pre>')); |
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} |
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if ( $#result < '1') { |
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return $result[0]; |
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} else { |
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&Apache::lonxml::debug("<b>Got lots results</b>:$#result:"); |
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return (@result); |
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} |
} |
} |
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sub dump { |
sub dump { |
my ($target,$safeeval)=@_; |
my ($target,$safeeval)=@_; |
my $dump=''; |
my $dump=''; |
foreach my $symname (sort keys %{$safeeval->varglob('main::')}) { |
foreach my $symname (sort keys %{$safeeval->varglob('main::')}) { |
if (($symname!~/^\_/) && ($symname!~/\:$/)) { |
if (($symname!~ /^(INC|SIG)/) && ($symname!~/\027/) && |
my $line; |
($symname!~/^\_/) && ($symname!~/\:$/)) { |
if ($safeeval->reval('defined($'.$symname.')')) { |
my $line; |
$line='$'.$symname.'='.$safeeval->reval('$'.$symname); |
if ($safeeval->reval('defined($'.$symname.')')) { |
} |
if ($symname =~ /^\w/) { |
if ($safeeval->reval('defined(@'.$symname.')')) { |
$line.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n"; |
$line='@'.$symname.'=('. |
} |
$safeeval->reval('join(",",@'.$symname.')').")"; |
} |
} |
if ($safeeval->reval('@'.$symname)) { |
if ($safeeval->reval('defined(%'.$symname.')')) { |
$line.='@'.$symname.'=('. |
$line='%'.$symname.'=('; |
$safeeval->reval('join(",",@'.$symname.')').")"."\n"; |
$line.=$safeeval->reval('join(",",map { $_."=>".$'. |
} |
$symname.'{$_} } sort keys %'. |
if ($safeeval->reval('%'.$symname)) { |
$symname.')').")" |
$line.='%'.$symname.'=('; |
} |
$line.=$safeeval->reval('join(",",map { $_."=>".$'. |
if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />\n"; } |
$symname.'{$_} } sort keys %'. |
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$symname.')').")"."\n"; |
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} |
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if ($line ne '') { |
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$line=&HTML::Entities::encode($line,'<>&"'); |
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$line=~s|\n|<br />|g; |
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$dump.=$line; |
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} |
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} |
} |
} |
} |
$dump.=''; |
$dump.=''; |
return $dump; |
return $dump; |
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} |
} |
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1; |
1; |
__END__; |
__END__; |
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=pod |
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=head1 NAME |
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Apache::run.pm |
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=head1 SYNOPSIS |
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Used to prevent poorly written problems from |
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causing lingering after effects |
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This is part of the LearningOnline Network with CAPA project |
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described at http://www.lon-capa.org. |
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=head1 NOTABLE SUBROUTINES |
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=over |
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=item run(), dump(), evaluate() |
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=back |
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=cut |
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