+++: rangematch() fixes

[perl/list-index.git] / lib / List / Index.pm

diff --git a/lib/List/Index.pm b/lib/List/Index.pm
index 89fdc75c83fa3c7b8709734f6b0403aeee087048..9c86bc3e62ca39787ee6d4aa98ac28b18a1b223f 100644 (file)
--- a/lib/List/Index.pm
+++ b/lib/List/Index.pm
@@ -6,7 +6,7 @@ use warnings;
 
 use Exporter 'import';
 
-our $VERSION = '1.00';
+our $VERSION = '1.01';
 our @EXPORT_OK = qw(rangematch);
 
 sub new {
@@ -60,32 +60,49 @@ sub rangematch {
 
        if (length $s1) {
                my $prefix = '';
-               my $c1;
+               my $char;
                for my $i (0 .. length($s1) - 1) {
-                       $c1 = substr $s1, $i, 1;
-                       my $c2 = length $s2 <= $i ? undef : substr $s2, $i, 1;
-                       my $next = $i + 1 >= length($s1) ? $c1 : chr( ord($c1) + 1 );
-                       my $last = defined $c2 && $i == 0 ? chr( ord($c2) - (length $s2 > 1) ) : 'z';
-                       $next le $last or next if defined $c2;
+                       $char = substr $s1, $i, 1;
+                       my $next = $char;
+                       $next = chr( ord($char) + 1 ) if length $s1 > $i + 1;
+                       my $last = 'z';
+                       if (length $s2 > $i) {
+                               if ($s2 =~ /^\Q$prefix/) {
+                                       $last = substr $s2, $i, 1;
+                                       next if $char eq $last;
+                                       $last = chr( ord($last) - (length $s2 > 1) );
+                                       next if $next gt $last;
+                               }
+                       }
                        push @allow, $prefix."[$next-$last]";
                }
                continue {
-                       $prefix .= $c1;
+                       $prefix .= $char;
                }
        }
 
        if (length $s2) {
                my $prefix = '';
+               my $char;
                for my $i (0 .. length($s2) - 1) {
-                       my $c1 = length $s1 <= $i ? undef : substr $s1, $i, 1;
-                       my $c2 = substr $s2, $i, 1;
+                       $char = substr $s2, $i, 1;
                        my $last = 'z';
-                       push @allow, "$prefix(?![$c2-$last])"
+                       if (length $s1 > $i) {
+                               my $c1 = substr $s1, $i, 1;
+                               if ($s1 =~ /^\Q$prefix/) {
+                                       next if $c1 eq $char;
+                               }
+                       }
+                       push @allow, $prefix."(?![$char-$last])"
                                if $i or $s1 eq '';
-                       $prefix .= $c2;
                }
+               continue {
+                       $prefix .= $char;
+               }
+
                push @allow, $prefix
-                       unless length $s1 > length $s2 or length $s1 != 0 && length $s2 == 1; #TODO
+                       if $s2 =~ /^\Q$prefix/ and $s1 le $s2
+                       and not (length $s2 == 1 && length $s1 >= length $s2 && $s1 ne $s2);
        }
 
        my $match = sprintf @allow <= 1 ? '%s' : '(?:%s)', join('|', @allow);
@@ -105,7 +122,11 @@ List::Index - Paginate alphabetic entries by finding minimal prefixes
        use List::Index;
        my $index = List::Index->new(\@values);
        my @pages = $index->ranges({pagesize => 50});
-       printf '<a href="?start=%s&amp;end=%s">%1$s</a> ', @$_ for @pages;
+       printf '<a href="?q=%s-%s">%1$s</a> ', @$_ for @pages;
+
+       use List::Index 'rangematch';
+       my $limit = rangematch('b-bmq');  # matches prefix like 'baa'..'bmq'
+       @results = grep { $limit } @results;
 
 =head1 DESCRIPTION