X-Git-Url: http://git.shiar.net/perl/list-index.git/blobdiff_plain/1c9de66914ea7bf8525df6f5285b649c006477b9..b6d480274eff8424a5ee22894a96bba261d3d4ae:/lib/List/Index.pm

diff --git a/lib/List/Index.pm b/lib/List/Index.pm
index dca0d1f..06c2727 100644
--- a/lib/List/Index.pm
+++ b/lib/List/Index.pm
@@ -23,14 +23,15 @@ sub ranges {
 	my $pages    = $options->{pages   } || 1 + int $#$self / $pagesize;
 
 	$pagesize = @$self / $pages;
-	my $offset = $pagesize;
+	my $offset = $pagesize + .5;
+	my $penalty = 0;
 	my @links = ('');
 	while ($offset < @$self) {
 		my $link = substr $self->[$offset], 0, $length;
 		if ($context) {
-			{
+			if ($offset > $context - 1 + $penalty) {
 				# take a value slightly before the current offset
-				my $before = $offset > $context ? $self->[$offset - $context] : '.';
+				my $before = $self->[$offset - $context - 1 + $penalty];
 				# see how much of it matches the current link
 				my $trim = 1;
 				for my $match (split //, $before) {
@@ -41,6 +42,7 @@ sub ranges {
 				substr($link, $trim) = '' unless $trim > length $link;
 			}
 
+			$penalty = 0;
 			if ($offset + $context < $#$self) {
 				# take a value after the current offset
 				my $after = $self->[$offset + $context];
@@ -53,6 +55,9 @@ sub ranges {
 				# use this link if it's shorter
 				if ($trim < length $link) {
 					$link = substr $after, 0, $trim;
+#					$offset += $context + 1;
+					$self->[$offset + ++$penalty] =~ /^\Q$link/
+						while $offset + $penalty < $#$self;
 				}
 			}
 		}
@@ -164,18 +169,18 @@ __END__
 
 =head1 NAME
 
-List::Index - Paginate alphabetic entries by finding minimal prefixes
+List::Index - Find and apply prefix ranges to paginate keywords
 
 =head1 SYNOPSIS
 
 	use List::Index;
 	my $index = List::Index->new(\@values);
 	my @pages = $index->ranges({pagesize => 50});
-	printf '<a href="?q=%s-%s">%1$s</a> ', @$_ for @pages;
+	say "<a href='?q=$_'>$_</a>" for @pages;
 
 	use List::Index 'rangematch';
-	my $limit = rangematch('b-bmq');  # matches prefix like 'baa'..'bmq'
-	@results = grep { $limit } @results;
+	my $limit = rangematch('b-bmq');  # ge 'b' && le 'bmq'
+	@request = grep { $limit } @values;
 
 =head1 DESCRIPTION