--- loncom/xml/run.pm	2001/12/11 15:48:51	1.22
+++ loncom/xml/run.pm	2002/05/23 21:12:44	1.28
@@ -1,6 +1,6 @@
 package Apache::run;
 #
-# $Id: run.pm,v 1.22 2001/12/11 15:48:51 albertel Exp $
+# $Id: run.pm,v 1.28 2002/05/23 21:12:44 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -25,34 +25,15 @@ package Apache::run;
 # http://www.lon-capa.org/
 #
 
-sub evaluateold {
-  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
-}
+use HTML::Entities;
 
 $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
-  my %oldexpressions=();
-  while (!$oldexpressions{$_}) {
-    $oldexpressions{$_}=1;
+  my %_LONCAPA_INTERNAL_oldexpressions=();
+  my $i=0;
+  while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
+    $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
+    if ($i++ > 10 ) { last; }
   }
 ENDEVALUATE
 
@@ -65,11 +46,14 @@ sub evaluate {
   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
 		   "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
 #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
+  my $error=$@;
   if ($@ eq '') {
     $result = $safeeval->reval('return $_;');
     chomp $result;
   } else {
-    &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");
+    &Apache::lonxml::error('substitution on <pre>'.$expression.
+			   '</pre> with <pre>'.$decls.
+			   '</pre> caused <pre>'.$error);
   }  
   return $result
 }
@@ -78,10 +62,14 @@ sub run {
   my ($code,$safeeval,$hideerrors) = @_;
 #  print "inside run\n";
   $@='';
+  $Apache::lonxml::request->hard_timeout("Apache::run::run, evaluation $code");
   my (@result)=$safeeval->reval($code);
-  if ($@ ne '' && !$hideerrors) {
-    &Apache::lonxml::error(":$code:caused");
-    &Apache::lonxml::error($@);
+  $Apache::lonxml::request->kill_timeout;
+  my $error=$@;
+  if ($error ne '' && !$hideerrors) {
+    &Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).
+			   '</pre> occured while running <pre>'.
+			   &HTML::Entities::encode($code).'</pre>');
   }
   if ( $#result < '1') {
     return $result[0];
@@ -96,19 +84,21 @@ sub dump {
   my $dump='';
   foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
     if (($symname!~/^\_/) && ($symname!~/\:$/)) {
+      my $line;
       if ($safeeval->reval('defined($'.$symname.')')) {
-	$dump.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
+	$line='$'.$symname.'='.$safeeval->reval('$'.$symname);
       }	
       if ($safeeval->reval('defined(@'.$symname.')')) {
-	$dump.='@'.$symname.'=('.
-	  $safeeval->reval('join(",",@'.$symname.')').")\n";
+	$line='@'.$symname.'=('.
+	  $safeeval->reval('join(",",@'.$symname.')').")";
       }
       if ($safeeval->reval('defined(%'.$symname.')')) {
-	$dump.='%'.$symname.'=(';
-	$dump.=$safeeval->reval('join(",",map { $_."=>".$'.
+	$line='%'.$symname.'=(';
+	$line.=$safeeval->reval('join(",",map { $_."=>".$'.
 				$symname.'{$_} } sort keys %'.
-				$symname.')').")\n";
+				$symname.')').")"
       }
+      if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />\n"; }
     }
   }
   $dump.='';