with "MooseRole";

[gitmo/Moo.git] / lib / Moo / Role.pm

diff --git a/lib/Moo/Role.pm b/lib/Moo/Role.pm
index 7a7cae1..e55836d 100644 (file)
--- a/lib/Moo/Role.pm
+++ b/lib/Moo/Role.pm
@@ -11,6 +11,7 @@ our %INFO;
 sub import {
   my $target = caller;
   strictures->import;
+  return if $INFO{$target}; # already exported into this package
   # get symbol table reference
   my $stash = do { no strict 'refs'; \%{"${target}::"} };
   *{_getglob "${target}::has"} = sub {
@@ -21,21 +22,76 @@ sub import {
     })->generate_method($target, $name, \%spec);
     $INFO{$target}{attributes}{$name} = \%spec;
   };
+  if ($INC{'Moo/HandleMoose.pm'}) {
+    Moo::HandleMoose::inject_fake_metaclass_for($target);
+  }
   goto &Role::Tiny::import;
 }
 
+sub _inhale_if_moose {
+  my ($self, $role) = @_;
+  _load_module($role);
+  if (!$INFO{$role} and $INC{"Moose.pm"}) {
+    if (my $meta = Class::MOP::class_of($role)) {
+      $INFO{$role}{methods} = {
+        map +($_ => $role->can($_)), $meta->get_method_list
+      };
+      $Role::Tiny::APPLIED_TO{$role} = {
+        map +($_->name => 1), $meta->calculate_all_roles
+      };
+      $INFO{$role}{requires} = [ $meta->get_required_method_list ];
+      $INFO{$role}{attributes} = {
+        map +($_ => $meta->get_attribute($_)), $meta->get_attribute_list
+      };
+      my $mods = $INFO{$role}{modifiers} = [];
+      foreach my $type (qw(before after around)) {
+        my $map = $meta->${\"get_${type}_method_modifiers_map"};
+        foreach my $method (keys %$map) {
+          foreach my $mod (@{$map->{$method}}) {
+            push @$mods, [ $type => $method => $mod ];
+          }
+        }
+      }
+      require Class::Method::Modifiers if @$mods;
+      $INFO{$role}{inhaled_from_moose} = 1;
+    }
+  }
+}
+
+sub _make_accessors_if_moose {
+  my ($self, $role, $target) = @_;
+  if ($INFO{$role}{inhaled_from_moose}) {
+    if (my $attrs = $INFO{$role}{attributes}) {
+      my $acc_gen = ($Moo::MAKERS{$target}{accessor} ||= do {
+        require Method::Generate::Accessor;
+        Method::Generate::Accessor->new
+      });
+      foreach my $name (keys %{$attrs}) {
+        $acc_gen->generate_method($target, $name, $attrs->{$name});
+      }
+    }
+  }
+}
+
 sub apply_role_to_package {
-  my ($me, $role, $to) = @_;
-  $me->SUPER::apply_role_to_package($role, $to);
+  my ($me, $to, $role) = @_;
+  $me->_inhale_if_moose($role);
+  $me->_make_accessors_if_moose($role, $to);
+  $me->SUPER::apply_role_to_package($to, $role);
   $me->_handle_constructor($to, $INFO{$role}{attributes});
 }
 
 sub create_class_with_roles {
   my ($me, $superclass, @roles) = @_;
 
-  my $new_name = join('+', $superclass, my $compose_name = join '+', @roles);
+  my $new_name = join(
+    '__WITH__', $superclass, my $compose_name = join '__AND__', @roles
+  );
+
   return $new_name if $Role::Tiny::COMPOSED{class}{$new_name};
 
+  $me->_inhale_if_moose($_) for @roles;
+
   require Sub::Quote;
 
   $me->SUPER::create_class_with_roles($superclass, @roles);
@@ -44,30 +100,103 @@ sub create_class_with_roles {
     die "${role} is not a Role::Tiny" unless my $info = $INFO{$role};
   }
 
+  $Moo::MAKERS{$new_name} = {};
+
   $me->_handle_constructor(
-    $new_name, { map %{$INFO{$_}{attributes}||{}}, @roles }
+    $new_name, { map %{$INFO{$_}{attributes}||{}}, @roles }, $superclass
   );
 
   return $new_name;
 }
 
+sub _composable_package_for {
+  my ($self, $role) = @_;
+  my $composed_name = 'Role::Tiny::_COMPOSABLE::'.$role;
+  return $composed_name if $Role::Tiny::COMPOSED{role}{$composed_name};
+  $self->_make_accessors_if_moose($role, $composed_name);
+  $self->SUPER::_composable_package_for($role);
+}
+
 sub _install_single_modifier {
   my ($me, @args) = @_;
   _install_modifier(@args);
 }
 
 sub _handle_constructor {
-  my ($me, $to, $attr_info) = @_;
+  my ($me, $to, $attr_info, $superclass) = @_;
   return unless $attr_info && keys %$attr_info;
   if ($INFO{$to}) {
     @{$INFO{$to}{attributes}||={}}{keys %$attr_info} = values %$attr_info;
   } else {
     # only fiddle with the constructor if the target is a Moo class
     if ($INC{"Moo.pm"}
-        and my $con = Moo->_constructor_maker_for($to)) {
+        and my $con = Moo->_constructor_maker_for($to, $superclass)) {
       $con->register_attribute_specs(%$attr_info);
     }
   }
 }
 
 1;
+
+=head1 NAME
+
+Moo::Role - Minimal Object Orientation support for Roles
+
+=head1 SYNOPSIS
+
+ package My::Role;
+
+ use Moo::Role;
+
+ sub foo { ... }
+
+ sub bar { ... }
+
+ has baz => (
+   is => 'ro',
+ );
+
+ 1;
+
+else where
+
+ package Some::Class;
+
+ use Moo;
+
+ # bar gets imported, but not foo
+ with('My::Role');
+
+ sub foo { ... }
+
+ 1;
+
+=head1 DESCRIPTION
+
+C<Moo::Role> builds upon L<Role::Tiny>, so look there for most of the
+documentation on how this works.  The main addition here is extra bits to make
+the roles more "Moosey;" which is to say, it adds L</has>.
+
+=head1 IMPORTED SUBROUTINES
+
+See L<Role::Tiny/IMPORTED SUBROUTINES> for all the other subroutines that are
+imported by this module.
+
+=head2 has
+
+ has attr => (
+   is => 'ro',
+ );
+
+Declares an attribute for the class to be composed into.  See
+L<Moo/has> for all options.
+
+=head1 AUTHORS
+
+See L<Moo> for authors.
+
+=head1 COPYRIGHT AND LICENSE
+
+See L<Moo> for the copyright and license.
+
+=cut