--- loncom/homework/structuretags.pm	2000/07/25 21:27:30	1.1
+++ loncom/homework/structuretags.pm	2000/10/11 21:03:27	1.9
@@ -1,6 +1,4 @@
-# The LearningOnline Network with CAPA
-# <script> definiton
-
+# The LearningOnline Network with CAPA # <script> definiton
 
 package Apache::structuretags; 
 
@@ -8,7 +6,21 @@ use strict;
 use Apache::lonnet;
 
 sub BEGIN {
-  &Apache::lonxml::register('Apache::structuretags',('block'));
+  &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem'));
+}
+
+sub start_problem {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  my $args ='';
+  if ( $#$parstack > -1 ) {
+    $args=$$parstack[$#$parstack];
+  }
+  my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);
+  return "<title>$name</title>\n<body bgcolor=#FFFFFF>\n"
+}
+
+sub end_problem {
+  return "</body>\n";
 }
 
 sub start_block {
@@ -17,9 +29,12 @@ sub start_block {
   my $code = @$parstack[$#$parstack];
   $code =~ s/\"//g;
   $code .=';return $condition;';
+#  print "<br>$code<br>";
   my $result = &Apache::run::run($code,$safeeval);
   if ( ! $result ) { 
-    my $skip=$parser->get_text("/block");
+#    my $skip=$$parser[$#$parser]->get_text("/block");
+    my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
+#    print "skipped $skip";
   }
   return "";
 }
@@ -27,5 +42,90 @@ 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;';
+
+  push( @Apache::structuretags::whileconds, $code); 
+  my $result = &Apache::run::run($code,$safeeval);
+  my $bodytext=$$parser[$#$parser]->get_text("/while");
+  push( @Apache::structuretags::whilebody, $bodytext);
+  if ( $result ) { 
+    &Apache::lonxml::newparser($parser,\$bodytext);
+  }
+  return "";
+}
+
+sub end_while {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  my $code = pop @Apache::structuretags::whileconds;
+  my $bodytext = pop @Apache::structuretags::whilebody;
+  my $result = &Apache::run::run($code,$safeeval);
+  if ( $result ) { 
+    &Apache::lonxml::newparser($parser,\$bodytext);
+  } 
+  return "";
+}
+
+# <randomlist> 
+#  <tag1>..</tag1>
+#  <tag2>..</tag2>
+#  <tag3>..</tag3>
+#  ... 
+# </randomlist>
+sub start_randomlist {
+  my ($target,$token,$parstack,$parser,$safeeval)=@_;
+  my $body= &Apache::lonxml::get_all_text("/randomlist",$$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[ $idx_arr[$_] ]";
+  }
+
+  &Apache::lonxml::newparser($parser,\$bodytext);
+  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__
