add missing files

[gitmo/MooseX-Types.git] / lib / MooseX / Types / Combine.pm

diff --git a/lib/MooseX/Types/Combine.pm b/lib/MooseX/Types/Combine.pm
new file mode 100644 (file)
index 0000000..a0fbe34
--- /dev/null
+++ b/lib/MooseX/Types/Combine.pm
@@ -0,0 +1,83 @@
+=head1 NAME
+
+MooseX::Types::Combine - Combine type libraries for exporting
+
+=cut
+
+package MooseX::Types::Combine;
+
+use strict;
+use warnings;
+use Class::MOP ();
+
+=head1 SYNOPSIS
+
+    package CombinedTypeLib;
+
+    use base 'MooseX::Types::Combined';
+
+    __PACKAGE__->provide_types_from(qw/TypeLib1 TypeLib2/);
+
+    package UserClass;
+
+    use CombinedTypeLib qw/Type1 Type2 ... /;
+
+=head1 DESCRIPTION
+
+Allows you to export types from multiple type libraries. 
+
+Libraries on the right side of the type libs passed to L</provide_types_from>
+take precedence over those on the left in case of conflicts.
+
+=cut
+
+sub import {
+    my ($class, @types) = @_;
+    my $caller = caller;
+
+    my @type_libs = $class->provide_types_from;
+    Class::MOP::load_class($_) for @type_libs;
+
+    my %types = map {
+        my $lib = $_;
+        map +($_ => $lib), $lib->type_names
+    } @type_libs;
+
+    my %from;
+    push @{ $from{ $types{ $_ } } }, $_ for @types;
+
+    $_->import({ -into => $caller }, @{ $from{ $_ } })
+        for keys %from;
+}
+
+=head1 CLASS METHODS
+
+=head2 provide_types_from
+
+Sets or returns a list of type libraries to re-export from.
+
+=cut
+
+sub provide_types_from {
+    my ($class, @libs) = @_;
+
+    my $store =
+     do { no strict 'refs'; \@{ "${class}::__MOOSEX_TYPELIBRARY_LIBRARIES" } };
+
+    @$store = @libs if @libs;
+
+    @$store;
+}
+
+=head1 SEE ALSO
+
+L<MooseX::Types>
+
+=head1 LICENSE
+
+This program is free software; you can redistribute it and/or modify
+it under the same terms as perl itself.
+
+=cut
+
+1;