5 use base qw(Role::Tiny);
7 require Moo::sification;
9 BEGIN { *INFO = \%Role::Tiny::INFO }
17 return if $INFO{$target}; # already exported into this package
18 # get symbol table reference
19 my $stash = do { no strict 'refs'; \%{"${target}::"} };
20 _install_coderef "${target}::has" => "Moo::Role::has" => sub {
21 my ($name, %spec) = @_;
22 ($INFO{$target}{accessor_maker} ||= do {
23 require Method::Generate::Accessor;
24 Method::Generate::Accessor->new
25 })->generate_method($target, $name, \%spec);
26 push @{$INFO{$target}{attributes}||=[]}, $name, \%spec;
27 $me->_maybe_reset_handlemoose($target);
29 # install before/after/around subs
30 foreach my $type (qw(before after around)) {
31 *{_getglob "${target}::${type}"} = sub {
32 require Class::Method::Modifiers;
33 push @{$INFO{$target}{modifiers}||=[]}, [ $type => @_ ];
34 $me->_maybe_reset_handlemoose($target);
37 *{_getglob "${target}::requires"} = sub {
38 push @{$INFO{$target}{requires}||=[]}, @_;
39 $me->_maybe_reset_handlemoose($target);
41 *{_getglob "${target}::with"} = sub {
42 $me->apply_roles_to_package($target, @_);
43 $me->_maybe_reset_handlemoose($target);
45 # grab all *non-constant* (stash slot is not a scalarref) subs present
46 # in the symbol table and store their refaddrs (no need to forcibly
47 # inflate constant subs into real subs) - also add '' to here (this
48 # is used later) with a map to the coderefs in case of copying or re-use
49 my @not_methods = ('', map { *$_{CODE}||() } grep !ref($_), values %$stash);
50 @{$INFO{$target}{not_methods}={}}{@not_methods} = @not_methods;
52 $Role::Tiny::APPLIED_TO{$target} = { $target => undef };
54 if ($INC{'Moo/HandleMoose.pm'}) {
55 Moo::HandleMoose::inject_fake_metaclass_for($target);
59 sub _maybe_reset_handlemoose {
60 my ($class, $target) = @_;
61 if ($INC{"Moo/HandleMoose.pm"}) {
62 Moo::HandleMoose::maybe_reinject_fake_metaclass_for($target);
66 sub _inhale_if_moose {
67 my ($self, $role) = @_;
73 and $meta = Class::MOP::class_of($role)
77 and $meta = Mouse::Util::find_meta($role)
80 $INFO{$role}{methods} = {
81 map +($_ => $role->can($_)),
82 grep !$meta->get_method($_)->isa('Class::MOP::Method::Meta'),
83 $meta->get_method_list
85 $Role::Tiny::APPLIED_TO{$role} = {
86 map +($_->name => 1), $meta->calculate_all_roles
88 $INFO{$role}{requires} = [ $meta->get_required_method_list ];
89 $INFO{$role}{attributes} = [
90 map +($_ => $meta->get_attribute($_)), $meta->get_attribute_list
92 my $mods = $INFO{$role}{modifiers} = [];
93 foreach my $type (qw(before after around)) {
94 # Mouse pokes its own internals so we have to fall back to doing
95 # the same thing in the absence of the Moose API method
97 $meta->can("get_${type}_method_modifiers_map")
98 or sub { shift->{"${type}_method_modifiers"} }
100 foreach my $method (keys %$map) {
101 foreach my $mod (@{$map->{$method}}) {
102 push @$mods, [ $type => $method => $mod ];
106 require Class::Method::Modifiers if @$mods;
107 $INFO{$role}{inhaled_from_moose} = 1;
111 sub _maybe_make_accessors {
112 my ($self, $role, $target) = @_;
114 if ($INFO{$role}{inhaled_from_moose}
116 and $m = Moo->_accessor_maker_for($target)
117 and ref($m) ne 'Method::Generate::Accessor') {
118 $self->_make_accessors($role, $target);
122 sub _make_accessors_if_moose {
123 my ($self, $role, $target) = @_;
124 if ($INFO{$role}{inhaled_from_moose}) {
125 $self->_make_accessors($role, $target);
129 sub _make_accessors {
130 my ($self, $role, $target) = @_;
131 my $acc_gen = ($Moo::MAKERS{$target}{accessor} ||= do {
132 require Method::Generate::Accessor;
133 Method::Generate::Accessor->new
135 my $con_gen = $Moo::MAKERS{$target}{constructor};
136 my @attrs = @{$INFO{$role}{attributes}||[]};
137 while (my ($name, $spec) = splice @attrs, 0, 2) {
138 # needed to ensure we got an index for an arrayref based generator
140 $spec = $con_gen->all_attribute_specs->{$name};
142 $acc_gen->generate_method($target, $name, $spec);
146 sub apply_roles_to_package {
147 my ($me, $to, @roles) = @_;
148 $me->_inhale_if_moose($_) for @roles;
149 $me->SUPER::apply_roles_to_package($to, @roles);
152 sub apply_single_role_to_package {
153 my ($me, $to, $role) = @_;
154 $me->_inhale_if_moose($role);
155 $me->_handle_constructor($to, $INFO{$role}{attributes});
156 $me->_maybe_make_accessors($role, $to);
157 $me->SUPER::apply_single_role_to_package($to, $role);
160 sub create_class_with_roles {
161 my ($me, $superclass, @roles) = @_;
164 '__WITH__', $superclass, my $compose_name = join '__AND__', @roles
167 return $new_name if $Role::Tiny::COMPOSED{class}{$new_name};
169 $me->_inhale_if_moose($_) for @roles;
173 and $m = Moo->_accessor_maker_for($superclass)
174 and ref($m) ne 'Method::Generate::Accessor') {
175 # old fashioned way time.
176 *{_getglob("${new_name}::ISA")} = [ $superclass ];
177 $me->apply_roles_to_package($new_name, @roles);
183 $me->SUPER::create_class_with_roles($superclass, @roles);
185 foreach my $role (@roles) {
186 die "${role} is not a Role::Tiny" unless my $info = $INFO{$role};
189 $Moo::MAKERS{$new_name} = {};
191 $me->_handle_constructor(
192 $new_name, [ map @{$INFO{$_}{attributes}||[]}, @roles ], $superclass
198 sub _composable_package_for {
199 my ($self, $role) = @_;
200 my $composed_name = 'Role::Tiny::_COMPOSABLE::'.$role;
201 return $composed_name if $Role::Tiny::COMPOSED{role}{$composed_name};
202 $self->_make_accessors_if_moose($role, $composed_name);
203 $self->SUPER::_composable_package_for($role);
206 sub _install_single_modifier {
207 my ($me, @args) = @_;
208 _install_modifier(@args);
211 sub _handle_constructor {
212 my ($me, $to, $attr_info, $superclass) = @_;
213 return unless $attr_info && @$attr_info;
215 push @{$INFO{$to}{attributes}||=[]}, @$attr_info;
217 # only fiddle with the constructor if the target is a Moo class
219 and my $con = Moo->_constructor_maker_for($to, $superclass)) {
220 # shallow copy of the specs since the constructor will assign an index
221 $con->register_attribute_specs(map ref() ? { %$_ } : $_, @$attr_info);
230 Moo::Role - Minimal Object Orientation support for Roles
254 # bar gets imported, but not foo
263 C<Moo::Role> builds upon L<Role::Tiny>, so look there for most of the
264 documentation on how this works. The main addition here is extra bits to make
265 the roles more "Moosey;" which is to say, it adds L</has>.
267 =head1 IMPORTED SUBROUTINES
269 See L<Role::Tiny/IMPORTED SUBROUTINES> for all the other subroutines that are
270 imported by this module.
278 Declares an attribute for the class to be composed into. See
279 L<Moo/has> for all options.
283 See L<Moo> for authors.
285 =head1 COPYRIGHT AND LICENSE
287 See L<Moo> for the copyright and license.