--- loncom/homework/structuretags.pm	2000/08/16 18:32:58	1.3
+++ loncom/homework/structuretags.pm	2000/08/22 16:19:26	1.4
@@ -8,7 +8,7 @@ use strict;
 use Apache::lonnet;
 
 sub BEGIN {
-  &Apache::lonxml::register('Apache::structuretags',('block'));
+  &Apache::lonxml::register('Apache::structuretags',('block','while'));
 }
 
 sub start_block {
@@ -30,5 +30,32 @@ sub start_block {
 sub end_block {
 }
 
+sub start_while {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+
+  my $code = @$parstack[$#$parstack];
+  $code =~ s/\"//g;
+  $code .=';return $condition;';
+
+  print "<H2>WHILE CONDITION = [$code]</H2>";
+  my $result = &Apache::run::run($code,$safeeval);
+  my $bodytext=$$parser[$#$parser]->get_text("/while");
+  if ( $result ) { # condition is TRUE, bodytext is evaluated
+# push the bodytext into parser stack
+     my $tempparser=HTML::TokeParser->new(\$bodytext);
+     push (@$parser,$tempparser);
+  } else { # condition is FALSE initially, skip bodytext
+  }
+  return "";
+}
+
+sub end_while {
+# pop parser from parser stack
+# check if condition is TRUE, 
+#   TRUE  then push content into parser stack
+#   FALSE then continue
+
+}
+
 1;
 __END__