X-Git-Url: http://git.shiar.net/perl/list-index.git/blobdiff_plain/f201c1cafae5e0a87e562961316c7650b0e2231a..b6d480274eff8424a5ee22894a96bba261d3d4ae:/lib/List/Index.pm

diff --git a/lib/List/Index.pm b/lib/List/Index.pm
index 3663c24..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;
 				}
 			}
 		}
@@ -78,6 +83,7 @@ sub rangematch {
 	my ($link) = @_;
 	my ($s1, $s2) = $link =~ /([^-]*) - ([^-]*)/x
 		or return qr/^\Q$link/i;
+	$s1 =~ s/\.$//;
 	my @allow;
 
 	if (length $s1) {
@@ -88,9 +94,12 @@ sub rangematch {
 		my $prefix = '';
 		my $char;
 		for my $i (0 .. length($s1) - 1) {
+			my $lasti = $i == length($s1) - 1;
 			$char = substr $s1, $i, 1;
 			my $next = $char;
-			$next = chr( ord($char) + 1 ) if length $s1 > $i + 1;
+			# do not include prefix character in final range
+			$next = chr( ord($char) + 1 ) unless $lasti;
+
 			my $last = 'z';
 			next if $next gt $last;
 			if (length $s2 > $i) {
@@ -101,10 +110,23 @@ sub rangematch {
 					next if $next gt $last;
 				}
 			}
+
+			if ($char eq '.') {
+				if ($last eq 'z') {
+#					push @allow, $prefix if $i and $lasti;
+#					next;
+				}
+#				if ($last eq 'z') {
+#					push @allow, $prefix if $i and $lasti;
+#					next;
+#				}
+				$next = 'a';
+			}
+
 			push @allow, $prefix."[$next-$last]";
 		}
 		continue {
-			$prefix .= $char;
+			$prefix .= $char eq '.' ? '[^a-z]' : $char;
 		}
 	}
 
@@ -120,11 +142,16 @@ sub rangematch {
 					next if $c1 le $char;
 				}
 			}
-			push @allow, $prefix."(?![$char-$last])"
+
+			if ($char eq '.') {
+				next if $i < length($s2) - 1;
+			}
+
+			push @allow, $prefix.'(?!['.($char eq '.' ? 'a' : $char)."-$last])"
 				if $i or $s1 eq '';
 		}
 		continue {
-			$prefix .= $char;
+			$prefix .= $char eq '.' ? '[^a-z]' : $char;
 		}
 
 		push @allow, $prefix
@@ -142,18 +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