X-Git-Url: http://git.shiar.net/perl/list-index.git/blobdiff_plain/20b084d596ff3d71a76dbc55a9f458911b4b8415..ab9917512865cf7070b364a1b0f07f32a3b49e3f:/lib/List/Index.pm

diff --git a/lib/List/Index.pm b/lib/List/Index.pm
index 574613e..47ef0da 100644
--- a/lib/List/Index.pm
+++ b/lib/List/Index.pm
@@ -28,16 +28,33 @@ sub ranges {
 	while ($offset < @$self) {
 		my $link = substr $self->[$offset], 0, $length;
 		if ($context) {
-			# 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++;
+			{
+				# 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 $link;
+			}
+
+			if ($offset + $context < $#$self) {
+				# take a value after the current offset
+				my $after = $self->[$offset + $context];
+				# see how much of it matches the current link
+				my $trim = 1;
+				for my $match (split //, $after) {
+					scalar $link =~ /\G\Q$match/g or last;
+					$trim++;
+				}
+				# use this link if it's shorter
+				if ($trim < length $link) {
+					$link = substr $after, 0, $trim;
+				}
 			}
-			# truncate link upto where the earlier value starts to differ
-			substr($link, $trim) = '' unless $trim > length $link;
 		}
 
 		push @links, [$link];