--- loncom/xml/run.pm	2000/10/30 20:05:19	1.9
+++ loncom/xml/run.pm	2001/11/07 22:29:17	1.20
@@ -1,8 +1,8 @@
 package Apache::run;
 
-sub evaluate {
+sub evaluateold {
   my ($expression,$safeeval,$decls) = @_;
-# print "inside2 evaluate $decls with $expression<br>\n";
+# print "inside2 evaluate $decls with $expression<br />\n";
 # gerd's old method interpolates unset vars
 # $safeeval->reval('return qq('.$expression.');');
   unless (defined $expression) { return ''; }
@@ -14,7 +14,7 @@ sub evaluate {
     if ($@ eq '') {
       $result = $safeeval->reval('return $_;');
     } else {
-      &Apache::lonxml::error("substituion on:$expression:with:$decls:caused");
+      &Apache::lonxml::error("substitution on:$expression:with:$decls:caused");
     }
   } else {
     &Apache::lonxml::error("defining:$expression:caused");
@@ -23,16 +23,71 @@ sub evaluate {
   return $result
 }
 
+$Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';  
+  my %oldexpressions=();
+  while (!$oldexpressions{$_}) {
+    $oldexpressions{$_}=1;
+    $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
+  }
+ENDEVALUATE
+
+sub evaluate {
+  my ($expression,$safeeval,$decls) = @_;
+  unless (defined $expression) { return ''; }
+  if (!$Apache::lonxml::evaluate) { return $expression; }
+  my $result = '';
+  $@='';
+  $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
+		   "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
+#  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');
+  if ($@ eq '') {
+    $result = $safeeval->reval('return $_;');
+    chomp $result;
+  } else {
+    &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");
+  }  
+  return $result
+}
+
 sub run {
-  my ($code,$safeeval) = @_;
+  my ($code,$safeeval,$hideerrors) = @_;
 #  print "inside run\n";
   $@='';
-  my $result=$safeeval->reval($code);
-  if ($@ ne '') { 
-    &Apache::lonxml::error(":$code:caused"); 
-    &Apache::lonxml::error($@); 
+  my (@result)=$safeeval->reval($code);
+  if ($@ ne '' && !$hideerrors) {
+    &Apache::lonxml::error(":$code:caused");
+    &Apache::lonxml::error($@);
+  }
+  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!~/\:$/)) {
+      if ($safeeval->reval('defined($'.$symname.')')) {
+	$dump.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
+      }	
+      if ($safeeval->reval('defined @'.$symname)) {
+	$dump.='@'.$symname.'=('.
+	  $safeeval->reval('join(",",@'.$symname.')').")\n";
+      }
+      if ($safeeval->reval('defined %'.$symname)) {
+	$dump.='%'.$symname.'=(';
+	$dump.=$safeeval->reval('join(",",map { $_."=>".$'.
+				$symname.'{$_} } sort keys %'.
+				$symname.')').")\n";
+      }
+    }
   }
-  return $result;
+  $dump.='';
+  return $dump;
 }
 
 1;