package Mouse::Meta::Role;
-use strict;
-use warnings;
+use Mouse::Util qw(:meta); # enables strict and warnings
-use Mouse::Util qw(not_supported);
-use base qw(Mouse::Meta::Module);
+use Mouse::Meta::Module;
+our @ISA = qw(Mouse::Meta::Module);
-sub _new {
+sub method_metaclass;
+
+sub _construct_meta {
my $class = shift;
- my %args = @_;
- $args{methods} ||= {};
- $args{attributes} ||= {};
- $args{required_methods} ||= [];
- $args{roles} ||= [];
+ my %args = @_;
- bless \%args, $class;
-}
+ $args{methods} = {};
+ $args{attributes} = {};
+ $args{required_methods} = [];
+ $args{roles} = [];
-sub get_roles { $_[0]->{roles} }
+ my $self = bless \%args, ref($class) || $class;
+ if($class ne __PACKAGE__){
+ $self->meta->_initialize_object($self, \%args);
+ }
+ return $self;
+}
-sub add_required_methods {
+sub create_anon_role{
my $self = shift;
- my @methods = @_;
- push @{$self->{required_methods}}, @methods;
+ return $self->create(undef, @_);
}
-sub add_attribute {
+sub is_anon_role;
+
+sub get_roles;
+
+sub calculate_all_roles {
my $self = shift;
- my $name = shift;
- my $spec = shift;
- $self->{attributes}->{$name} = $spec;
+ my %seen;
+ return grep { !$seen{ $_->name }++ }
+ ($self, map { $_->calculate_all_roles } @{ $self->get_roles });
}
-sub _check_required_methods{
- my($role, $class, $args, @other_roles) = @_;
-
- if($class->isa('Mouse::Meta::Class')){
- my $class_name = $class->name;
- foreach my $method_name(@{$role->{required_methods}}){
- unless($class_name->can($method_name)){
- my $role_name = $role->name;
- my $has_method = 0;
-
- foreach my $another_role_spec(@other_roles){
- my $another_role_name = $another_role_spec->[0];
- if($role_name ne $another_role_name && $another_role_name->can($method_name)){
- $has_method = 1;
- last;
- }
- }
-
- $role->throw_error("'$role_name' requires the method '$method_name' to be implemented by '$class_name'")
- unless $has_method;
- }
- }
- }
+sub get_required_method_list{
+ return @{ $_[0]->{required_methods} };
+}
+sub add_required_methods {
+ my($self, @methods) = @_;
+ my %required = map{ $_ => 1 } @{$self->{required_methods}};
+ push @{$self->{required_methods}}, grep{ !$required{$_}++ && !$self->has_method($_) } @methods;
return;
}
-sub _apply_methods{
- my($role, $class, $args) = @_;
-
- my $role_name = $role->name;
- my $class_name = $class->name;
- my $alias = $args->{alias};
-
- foreach my $method_name($role->get_method_list){
- next if $method_name eq 'meta';
-
- my $code = $role_name->can($method_name);
- if(do{ no strict 'refs'; defined &{$class_name . '::' . $method_name} }){
- # XXX what's Moose's behavior?
- }
- else{
- $class->add_method($method_name => $code);
- }
-
- if($alias && $alias->{$method_name}){
- my $dstname = $alias->{$method_name};
- if(do{ no strict 'refs'; defined &{$class_name . '::' . $dstname} }){
- # XXX wat's Moose's behavior?
- }
- else{
- $class->add_method($dstname => $code);
- }
- }
- }
-
- return;
+sub requires_method {
+ my($self, $name) = @_;
+ return scalar( grep{ $_ eq $name } @{ $self->{required_methods} } ) != 0;
}
-sub _apply_attributes{
- my($role, $class, $args) = @_;
-
- if ($class->isa('Mouse::Meta::Class')) {
- # apply role to class
- for my $attr_name ($role->get_attribute_list) {
- next if $class->has_attribute($attr_name);
-
- my $spec = $role->get_attribute($attr_name);
-
- my $attr_metaclass = 'Mouse::Meta::Attribute';
- if ( my $metaclass_name = $spec->{metaclass} ) {
- $attr_metaclass = Mouse::Util::resolve_metaclass_alias(
- 'Attribute',
- $metaclass_name
- );
- }
-
- $attr_metaclass->create($class, $attr_name => %$spec);
- }
- } else {
- # apply role to role
- for my $attr_name ($role->get_attribute_list) {
- next if $class->has_attribute($attr_name);
-
- my $spec = $role->get_attribute($attr_name);
- $class->add_attribute($attr_name => $spec);
- }
- }
+sub add_attribute {
+ my $self = shift;
+ my $name = shift;
+ $self->{attributes}->{$name} = (@_ == 1) ? $_[0] : { @_ };
return;
}
-sub _apply_modifiers{
- my($role, $class, $args) = @_;
- for my $modifier_type (qw/before after around override/) {
- my $add_modifier = "add_${modifier_type}_method_modifier";
- my $modifiers = $role->{"${modifier_type}_method_modifiers"};
+# Moose uses Application::ToInstance, Application::ToClass, Application::ToRole
+sub apply {
+ my $self = shift;
+ my $consumer = shift;
- while(my($method_name, $modifier_codes) = each %{$modifiers}){
- foreach my $code(@{$modifier_codes}){
- $class->$add_modifier($method_name => $code);
- }
- }
- }
- return;
+ require 'Mouse/Meta/Role/Application.pm';
+ return Mouse::Meta::Role::Application->new(@_)->apply($self, $consumer);
}
-sub _append_roles{
- my($role, $class, $args) = @_;
-
- my $roles = $class->isa('Mouse::Meta::Class') ? $class->roles : $class->get_roles;
- foreach my $r($role, @{$role->get_roles}){
- if(!$class->does_role($r->name)){
- push @{$roles}, $r;
- }
- }
- return;
-}
+sub combine {
+ my($self, @role_specs) = @_;
-# Moose uses Application::ToInstance, Application::ToClass, Application::ToRole
-sub apply {
- my($self, $class, %args) = @_;
+ require 'Mouse/Meta/Role/Composite.pm';
+ my $composite = Mouse::Meta::Role::Composite->create_anon_role();
- if ($class->isa('Mouse::Object')) {
- not_supported 'Application::ToInstance';
+ foreach my $role_spec (@role_specs) {
+ my($role_name, $args) = @{$role_spec};
+ $role_name->meta->apply($composite, %{$args});
}
-
- $self->_check_required_methods($class, \%args);
- $self->_apply_methods($class, \%args);
- $self->_apply_attributes($class, \%args);
- $self->_apply_modifiers($class, \%args);
- $self->_append_roles($class, \%args);
- return;
+ return $composite;
}
-sub combine_apply {
- my(undef, $class, @roles) = @_;
+sub add_before_method_modifier;
+sub add_around_method_modifier;
+sub add_after_method_modifier;
- foreach my $role_spec (@roles) {
- my($role_name, $args) = @{$role_spec};
+sub get_before_method_modifiers;
+sub get_around_method_modifiers;
+sub get_after_method_modifiers;
- my $role = $role_name->meta;
+sub add_override_method_modifier{
+ my($self, $method_name, $method) = @_;
- $role->_check_required_methods($class, $args, @roles);
- $role->_apply_methods($class, $args);
- $role->_apply_attributes($class, $args);
- $role->_apply_modifiers($class, $args);
- $role->_append_roles($class, $args);
+ if($self->has_method($method_name)){
+ # This error happens in the override keyword or during role composition,
+ # so I added a message, "A local method of ...", only for compatibility (gfx)
+ $self->throw_error("Cannot add an override of method '$method_name' "
+ . "because there is a local version of '$method_name'"
+ . "(A local method of the same name as been found)");
}
- return;
+
+ $self->{override_method_modifiers}->{$method_name} = $method;
}
-for my $modifier_type (qw/before after around override/) {
-
- my $modifier = "${modifier_type}_method_modifiers";
- my $add_method_modifier = sub {
- my ($self, $method_name, $method) = @_;
-
- push @{ $self->{$modifier}->{$method_name} ||= [] }, $method;
- return;
- };
- my $has_method_modifiers = sub{
- my($self, $method_name) = @_;
- my $m = $self->{$modifier}->{$method_name};
- return $m && @{$m} != 0;
- };
- my $get_method_modifiers = sub {
- my ($self, $method_name) = @_;
- return @{ $self->{$modifier}->{$method_name} ||= [] }
- };
-
- no strict 'refs';
- *{ 'add_' . $modifier_type . '_method_modifier' } = $add_method_modifier;
- *{ 'has_' . $modifier_type . '_method_modifiers' } = $has_method_modifiers;
- *{ 'get_' . $modifier_type . '_method_modifiers' } = $get_method_modifiers;
+sub get_override_method_modifier {
+ my ($self, $method_name) = @_;
+ return $self->{override_method_modifiers}->{$method_name};
}
-# This is currently not passing all the Moose tests.
sub does_role {
my ($self, $role_name) = @_;
(defined $role_name)
|| $self->throw_error("You must supply a role name to look for");
+ $role_name = $role_name->name if ref $role_name;
+
# if we are it,.. then return true
return 1 if $role_name eq $self->name;
# otherwise.. check our children
return 0;
}
-
1;
+__END__
+
+=head1 NAME
+
+Mouse::Meta::Role - The Mouse Role metaclass
+
+=head1 VERSION
+
+This document describes Mouse version 0.70
+
+=head1 DESCRIPTION
+
+This class is a meta object protocol for Mouse roles,
+which is a subset of Moose::Meta:::Role.
+
+=head1 SEE ALSO
+
+L<Moose::Meta::Role>
+=cut
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