--- loncom/homework/response.pm	2007/08/10 18:16:28	1.174
+++ loncom/homework/response.pm	2007/09/27 19:05:03	1.178
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # various response type definitons response definition
 #
-# $Id: response.pm,v 1.174 2007/08/10 18:16:28 riegler Exp $
+# $Id: response.pm,v 1.178 2007/09/27 19:05:03 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -569,8 +569,7 @@ sub implicit_multiplication {
     $expression=~s/(\d+)(?:x|\*)10(?:\^|\*\*)([\+\-]*\d+)/$1\&\($2\)/gsi;
 # Fill in multiplication signs
 # a b -> a*b;3 b -> 3*b;3 4 -> 3*4
-# The while-pos-construction is necessary for a b c -> a*b*c*d instead of a*b c*d
-    while($expression=~s/([A-Za-z0-9])\s+([A-Za-z0-9])/$1\*$2/gs){pos($expression)--}
+    $expression=~s/([A-Za-z0-9])\s+(?=[A-Za-z0-9])/$1\*/gs;
 # )( -> )*(; ) ( -> )*(
     $expression=~s/\)\s*\(/\)\*\(/gs;
 # 3a -> 3*a; 3( -> 3*(; 3 ( -> 3*(; 3A -> 3*A
@@ -900,6 +899,11 @@ sub getresponse {
 	    }
 	    
 	}
+
+	# save bubbled letter for later
+	$Apache::lonhomework::results{"resource.$part.$id.scantron"}.=
+	    $response;
+
 	if ($resulttype ne 'letter') {
 	    if ($resulttype eq 'A is 1') {
 		$response = $let_to_num{$response}+1;
@@ -914,9 +918,6 @@ sub getresponse {
 		$response = chr(ord($response) + $line * $bubbles_per_line);
 	    }
 	}
-	# save submitted response for later
-	$Apache::lonhomework::results{"resource.$part.$id.scantron"}.=
-	    $response;
 
     } else {
 	$response = $env{$formparm};
@@ -1207,6 +1208,21 @@ sub check_status {
     return 2;
 }
 
+=pod
+
+=item setup_prior_tries_hash($func,$data)
+
+  Foreach each past .submission $func is called with 3 arguments
+     - the mode to set things up for (currently always 'grade')
+     - the stored .submission string
+     - The expansion of $data
+
+  $data is an array ref containing elements that are either
+    - scalars that are other elements of the history hash to pass to $func
+    - ref to data to be passed untouched to $func
+
+=cut
+
 sub setup_prior_tries_hash {
     my ($func,$data) = @_;
     my $part = $Apache::inputtags::part;