X-Git-Url: http://git.shiar.net/perl/list-index.git/blobdiff_plain/df37e7ec6afd25d57679dc37999a36887d2247ca..20b084d596ff3d71a76dbc55a9f458911b4b8415:/lib/List/Index.pm

diff --git a/lib/List/Index.pm b/lib/List/Index.pm
index e30beef..574613e 100644
--- a/lib/List/Index.pm
+++ b/lib/List/Index.pm
@@ -28,12 +28,15 @@ sub ranges {
 	while ($offset < @$self) {
 		my $link = substr $self->[$offset], 0, $length;
 		if ($context) {
-			my $trim = 1;
+			# take a value slightly before the current offset
 			my $before = $offset > $context ? $self->[$offset - $context] : '.';
+			# see how much of it matches the current link
+			my $trim = 1;
 			for my $match (split //, $before) {
 				scalar $link =~ /\G\Q$match/g or last;
 				$trim++;
 			}
+			# truncate link upto where the earlier value starts to differ
 			substr($link, $trim) = '' unless $trim > length $link;
 		}