use strict;
use warnings;
-use Scalar::Util ();
+use Scalar::Util 'blessed';
use Carp 'confess';
use Sub::Name 'subname';
-our $VERSION = '0.01';
+use Sub::Exporter;
+
+our $VERSION = '0.07';
+our $AUTHORITY = 'cpan:STEVAN';
+
+use Moose ();
use Moose::Meta::Role;
+use Moose::Util::TypeConstraints;
+
+{
+ my ( $CALLER, %METAS );
+
+ sub _find_meta {
+ my $role = $CALLER;
+
+ return $METAS{$role} if exists $METAS{$role};
+
+ # make a subtype for each Moose class
+ subtype $role
+ => as 'Role'
+ => where { $_->does($role) }
+ => optimize_as { blessed($_[0]) && $_[0]->can('does') && $_[0]->does($role) }
+ unless find_type_constraint($role);
+
+ my $meta;
+ if ($role->can('meta')) {
+ $meta = $role->meta();
+ (blessed($meta) && $meta->isa('Moose::Meta::Role'))
+ || confess "You already have a &meta function, but it does not return a Moose::Meta::Role";
+ }
+ else {
+ $meta = Moose::Meta::Role->initialize($role);
+ $meta->alias_method('meta' => sub { $meta });
+ }
+
+ return $METAS{$role} = $meta;
+ }
+
+
+ my %exports = (
+ extends => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::extends' => sub {
+ confess "Moose::Role does not currently support 'extends'"
+ };
+ },
+ with => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::with' => sub (@) {
+ my (@roles) = @_;
+ confess "Must specify at least one role" unless @roles;
+ Class::MOP::load_class($_) for @roles;
+ ($_->can('meta') && $_->meta->isa('Moose::Meta::Role'))
+ || confess "You can only consume roles, $_ is not a Moose role"
+ foreach @roles;
+ if (scalar @roles == 1) {
+ $roles[0]->meta->apply($meta);
+ }
+ else {
+ Moose::Meta::Role->combine(
+ map { $_->meta } @roles
+ )->apply($meta);
+ }
+ };
+ },
+ requires => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::requires' => sub (@) {
+ confess "Must specify at least one method" unless @_;
+ $meta->add_required_methods(@_);
+ };
+ },
+ excludes => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::excludes' => sub (@) {
+ confess "Must specify at least one role" unless @_;
+ $meta->add_excluded_roles(@_);
+ };
+ },
+ has => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::has' => sub ($;%) {
+ my ($name, %options) = @_;
+ $meta->add_attribute($name, %options)
+ };
+ },
+ before => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::before' => sub (@&) {
+ my $code = pop @_;
+ $meta->add_before_method_modifier($_, $code) for @_;
+ };
+ },
+ after => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::after' => sub (@&) {
+ my $code = pop @_;
+ $meta->add_after_method_modifier($_, $code) for @_;
+ };
+ },
+ around => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::around' => sub (@&) {
+ my $code = pop @_;
+ $meta->add_around_method_modifier($_, $code) for @_;
+ };
+ },
+ super => sub {
+ {
+ no strict 'refs';
+ $Moose::SUPER_SLOT{$CALLER} = \*{"${CALLER}::super"};
+ }
+ my $meta = _find_meta();
+ return subname 'Moose::Role::super' => sub {};
+ },
+ override => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::override' => sub ($&) {
+ my ($name, $code) = @_;
+ $meta->add_override_method_modifier($name, $code);
+ };
+ },
+ inner => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::inner' => sub {
+ confess "Moose::Role cannot support 'inner'";
+ };
+ },
+ augment => sub {
+ my $meta = _find_meta();
+ return subname 'Moose::Role::augment' => sub {
+ confess "Moose::Role cannot support 'augment'";
+ };
+ },
+ confess => sub {
+ return \&Carp::confess;
+ },
+ blessed => sub {
+ return \&Scalar::Util::blessed;
+ }
+ );
+
+ my $exporter = Sub::Exporter::build_exporter({
+ exports => \%exports,
+ groups => {
+ default => [':all']
+ }
+ });
+
+ sub import {
+ $CALLER =
+ ref $_[1] && defined $_[1]->{into} ? $_[1]->{into}
+ : ref $_[1]
+ && defined $_[1]->{into_level} ? caller( $_[1]->{into_level} )
+ : caller();
+
+
+ strict->import;
+ warnings->import;
+
+ # we should never export to main
+ return if $CALLER eq 'main';
+
+ goto $exporter;
+ };
-sub import {
- shift;
- my $pkg = caller();
-
- # we should never export to main
- return if $pkg eq 'main';
-
- Moose::Util::TypeConstraints->import($pkg);
-
- my $meta;
- if ($pkg->can('meta')) {
- $meta = $pkg->meta();
- (blessed($meta) && $meta->isa('Moose::Meta::Role'))
- || confess "Whoops, not møøsey enough";
- }
- else {
- $meta = Moose::Meta::Role->new(role_name => $pkg);
- $meta->role_meta->add_method('meta' => sub { $meta })
- }
-
- # NOTE:
- # &alias_method will install the method, but it
- # will not name it with
-
- # handle superclasses
- $meta->role_meta->alias_method('extends' => subname 'Moose::Role::extends' => sub {
- confess "Moose::Role does not currently support 'extends'"
- });
-
- # handle attributes
- $meta->role_meta->alias_method('has' => subname 'Moose::Role::has' => sub {
- my ($name, %options) = @_;
- $meta->add_attribute($name, %options)
- });
-
- # handle method modifers
- $meta->role_meta->alias_method('before' => subname 'Moose::Role::before' => sub {
- my $code = pop @_;
- $meta->add_before_method_modifier($_, $code) for @_;
- });
- $meta->role_meta->alias_method('after' => subname 'Moose::Role::after' => sub {
- my $code = pop @_;
- $meta->add_after_method_modifier($_, $code) for @_;
- });
- $meta->role_meta->alias_method('around' => subname 'Moose::Role::around' => sub {
- my $code = pop @_;
- $meta->add_around_method_modifier($_, $code) for @_;
- });
-
- $meta->role_meta->alias_method('super' => subname 'Moose::Role::super' => sub {});
- $meta->role_meta->alias_method('override' => subname 'Moose::Role::override' => sub {
- my ($name, $code) = @_;
- $meta->add_override_method_modifier($name, $code);
- });
-
- $meta->role_meta->alias_method('inner' => subname 'Moose::Role::inner' => sub {
- confess "Moose::Role does not currently support 'inner'";
- });
- $meta->role_meta->alias_method('augment' => subname 'Moose::Role::augment' => sub {
- confess "Moose::Role does not currently support 'augment'";
- });
-
- # we recommend using these things
- # so export them for them
- $meta->role_meta->alias_method('confess' => \&Carp::confess);
- $meta->role_meta->alias_method('blessed' => \&Scalar::Util::blessed);
}
1;
=head1 SYNOPSIS
package Eq;
- use strict;
- use warnings;
- use Moose::Role;
-
- sub equal { confess "equal must be implemented" }
-
- sub no_equal {
+ use Moose::Role; # automatically turns on strict and warnings
+
+ requires 'equal';
+
+ sub no_equal {
my ($self, $other) = @_;
!$self->equal($other);
}
-
+
# ... then in your classes
-
+
package Currency;
- use strict;
- use warnings;
- use Moose;
-
+ use Moose; # automatically turns on strict and warnings
+
with 'Eq';
-
+
sub equal {
my ($self, $other) = @_;
- $other->as_float == $other->as_float;
+ $self->as_float == $other->as_float;
}
=head1 DESCRIPTION
-This is currently a very early release of Perl 6 style Roles for
-Moose, it should be considered experimental and incomplete.
+Role support in Moose is pretty solid at this point. However, the best
+documentation is still the the test suite. It is fairly safe to assume Perl 6
+style behavior and then either refer to the test suite, or ask questions on
+#moose if something doesn't quite do what you expect.
+
+We are planning writing some more documentation in the near future, but nothing
+is ready yet, sorry.
+
+=head1 EXPORTED FUNCTIONS
+
+Moose::Role currently supports all of the functions that L<Moose> exports, but
+differs slightly in how some items are handled (see L<CAVEATS> below for
+details).
-This feature is being actively developed, but $work is currently
-preventing me from paying as much attention to it as I would like.
-So I am releasing it in hopes people will help me on this I<hint hint>.
+Moose::Role also offers two role-specific keyword exports:
-If you are interested in helping, please come to #moose on irc.perl.org
-and we can talk.
+=over 4
+
+=item B<requires (@method_names)>
+
+Roles can require that certain methods are implemented by any class which
+C<does> the role.
+
+=item B<excludes (@role_names)>
+
+Roles can C<exclude> other roles, in effect saying "I can never be combined
+with these C<@role_names>". This is a feature which should not be used
+lightly.
+
+=back
=head1 CAVEATS
-Currently, the role support has a number of caveats. They are as follows:
+Role support has only a few caveats:
=over 4
=item *
-There is no support for Roles consuming other Roles. The details of this
-are not totally worked out yet, but it will mostly follow what is set out
-in the Perl 6 Synopsis 12.
+Roles cannot use the C<extends> keyword; it will throw an exception for now.
+The same is true of the C<augment> and C<inner> keywords (not sure those
+really make sense for roles). All other Moose keywords will be I<deferred>
+so that they can be applied to the consuming class.
=item *
-At this time classes I<can> consume more than one Role, but they are simply
-applied one after another in the order you ask for them. This is incorrect
-behavior, the roles should be merged first, and conflicts determined, etc.
-However, if your roles do not have any conflicts, then things will work just
-fine.
-
-=item *
+Role composition does its best to B<not> be order-sensitive when it comes to
+conflict resolution and requirements detection. However, it is order-sensitive
+when it comes to method modifiers. All before/around/after modifiers are
+included whenever a role is composed into a class, and then applied in the order
+in which the roles are used. This also means that there is no conflict for
+before/around/after modifiers.
-I want to have B<required> methods, which is unlike Perl 6 roles, and more
-like the original Traits on which roles are based. This would be similar
-in behavior to L<Class::Trait>. These are not yet implemented or course.
+In most cases, this will be a non-issue; however, it is something to keep in
+mind when using method modifiers in a role. You should never assume any
+ordering.
=item *
-Roles cannot use the C<extends> keyword, it will throw an exception for now.
-The same is true of the C<augment> and C<inner> keywords (not sure those
-really make sense for roles). All other Moose keywords will be I<deferred>
-so that they can be applied to the consuming class.
+The C<requires> keyword currently only works with actual methods. A method
+modifier (before/around/after and override) will not count as a fufillment
+of the requirement, and neither will an autogenerated accessor for an attribute.
-=back
+It is likely that attribute accessors will eventually be allowed to fufill those
+requirements, or we will introduce a C<requires_attr> keyword of some kind
+instead. This decision has not yet been finalized.
-Basically thats all I can think of for now, I am sure there are more though.
+=back
=head1 BUGS
-All complex software has bugs lurking in it, and this module is no
+All complex software has bugs lurking in it, and this module is no
exception. If you find a bug please either email me, or add the bug
to cpan-RT.
Stevan Little E<lt>stevan@iinteractive.comE<gt>
+Christian Hansen E<lt>chansen@cpan.orgE<gt>
+
=head1 COPYRIGHT AND LICENSE
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
-it under the same terms as Perl itself.
+it under the same terms as Perl itself.
-=cut
\ No newline at end of file
+=cut
projects / gitmo/Moose.git / blobdiff