--- loncom/homework/structuretags.pm	2000/08/25 14:40:47	1.5
+++ loncom/homework/structuretags.pm	2000/09/18 15:43:38	1.7
@@ -1,5 +1,4 @@
-# The LearningOnline Network with CAPA
-# <script> definiton
+# The LearningOnline Network with CAPA # <script> definiton
 
 package Apache::structuretags; 
 
@@ -7,7 +6,7 @@ use strict;
 use Apache::lonnet;
 
 sub BEGIN {
-  &Apache::lonxml::register('Apache::structuretags',('block','while'));
+  &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist'));
 }
 
 sub start_block {
@@ -44,7 +43,6 @@ sub start_while {
      my $tempparser=HTML::TokeParser->new(\$bodytext);
      push (@$parser,$tempparser);
   }
-
   return "";
 }
 
@@ -60,5 +58,62 @@ sub end_while {
   return "";
 }
 
+# <randomlist> 
+#  <tag1>..</tag1>
+#  <tag2>..</tag2>
+#  <tag3>..</tag3>
+#  ... 
+# </randomlist>
+sub start_randomlist {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  my $body= &Apache::lonxml::get_all_text("randomlist",$$parser[$#$parser]);
+  my $b_parser= HTML::TokeParser->new(\$body);
+  my $b_tok;
+  my @randomlist;
+  my $list_item;
+
+  while($b_tok = $b_parser->get_token() ) {
+    if($b_tok->[0] eq 'S') { # start tag
+    # get content of the tag until matching end tag
+    # get all text upto the matching tag
+    # and push the content into @randomlist
+      $list_item = &Apache::lonxml::get_all_text($b_tok->[1],$b_parser);
+      $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
+      push(@randomlist,$list_item);
+   #  print "<BR><B>START-TAG $b_tok->[1], $b_tok->[4], $list_item</B>";
+    }
+    if($b_tok->[0] eq 'T') { # text
+    # what to do with text in between tags?
+      #  print "<B>TEXT $b_tok->[1]</B><BR>";
+    }
+    # if($b_tok->[0] eq 'E') { # end tag, should not happen
+      #  print "<B>END-TAG $b_tok->[1]</B><BR>";
+    # }
+  }
+  my @idx_arr = (0 .. $#randomlist);
+  &Apache::structuretags::shuffle(\@idx_arr);
+  my $bodytext = '';
+  for(0 .. $#randomlist) {
+    $bodytext .= "$randomlist[ $idx_arr[$_] ]";
+  }
+  my $tempparser=HTML::TokeParser->new(\$bodytext);
+  push (@$parser,$tempparser);
+  return "";
+}
+
+sub shuffle {
+    my $a=shift;
+    my $i;
+    for($i=@$a;--$i;) {
+      my $j=int rand($i+1);
+      next if $i == $j;
+      @$a[$i,$j] = @$a[$j,$i];
+    }
+}
+
+sub end_randomlist {
+}
+
+
 1;
 __END__