package Mouse::Meta::Role;
-use strict;
-use warnings;
-use Carp 'confess';
+use Mouse::Util qw(:meta); # enables strict and warnings
-use Mouse::Util qw(version authority identifier);
+use Mouse::Meta::Module;
+our @ISA = qw(Mouse::Meta::Module);
-do {
- my %METACLASS_CACHE;
+sub method_metaclass;
- # because Mouse doesn't introspect existing classes, we're forced to
- # only pay attention to other Mouse classes
- sub _metaclass_cache {
- my $class = shift;
- my $name = shift;
- return $METACLASS_CACHE{$name};
- }
-
- sub initialize {
- my $class = shift;
- my $name = shift;
- $METACLASS_CACHE{$name} = $class->new(name => $name)
- if !exists($METACLASS_CACHE{$name});
- return $METACLASS_CACHE{$name};
- }
-};
-
-sub new {
+sub _construct_meta {
my $class = shift;
+
my %args = @_;
- $args{attributes} ||= {};
- $args{required_methods} ||= [];
- $args{roles} ||= [];
+ $args{methods} = {};
+ $args{attributes} = {};
+ $args{required_methods} = [];
+ $args{roles} = [];
- bless \%args, $class;
-}
+ my $self = bless \%args, ref($class) || $class;
+ if($class ne __PACKAGE__){
+ $self->meta->_initialize_object($self, \%args);
+ }
-sub name { $_[0]->{name} }
+ 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 is_anon_role;
+sub get_roles;
-sub add_attribute {
+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 has_attribute { exists $_[0]->{attributes}->{$_[1]} }
-sub get_attribute_list { keys %{ $_[0]->{attributes} } }
-sub get_attribute { $_[0]->{attributes}->{$_[1]} }
+sub get_required_method_list{
+ return @{ $_[0]->{required_methods} };
+}
-# copied from Class::Inspector
-sub get_method_list {
+sub add_required_methods {
+ my($self, @methods) = @_;
+ my %required = map{ $_ => 1 } @{$self->{required_methods}};
+ push @{$self->{required_methods}}, grep{ !$required{$_}++ && !$self->has_method($_) } @methods;
+ return;
+}
+
+sub requires_method {
+ my($self, $name) = @_;
+ return scalar( grep{ $_ eq $name } @{ $self->{required_methods} } ) != 0;
+}
+
+sub add_attribute {
my $self = shift;
- my $name = $self->name;
-
- no strict 'refs';
- # Get all the CODE symbol table entries
- my @functions =
- grep !/^(?:has|with|around|before|after|augment|inner|override|super|blessed|extends|confess|excludes|requires)$/,
- grep { defined &{"${name}::$_"} }
- keys %{"${name}::"};
- wantarray ? @functions : \@functions;
+ my $name = shift;
+
+ $self->{attributes}->{$name} = (@_ == 1) ? $_[0] : { @_ };
+ return;
}
+
# Moose uses Application::ToInstance, Application::ToClass, Application::ToRole
sub apply {
- my $self = shift;
- my $selfname = $self->name;
- my $class = shift;
- my $classname = $class->name;
- my %args = @_;
-
- if ($class->isa('Mouse::Object')) {
- Carp::croak('Mouse does not support Application::ToInstance yet');
- }
+ my $self = shift;
+ my $consumer = shift;
- if ($class->isa('Mouse::Meta::Class')) {
- for my $name (@{$self->{required_methods}}) {
- unless ($classname->can($name)) {
- confess "'$selfname' requires the method '$name' to be implemented by '$classname'";
- }
- }
- }
+ require 'Mouse/Meta/Role/Application.pm';
+ return Mouse::Meta::Role::Application->new(@_)->apply($self, $consumer);
+}
- {
- no strict 'refs';
- for my $name ($self->get_method_list) {
- next if $name eq 'meta';
-
- my $class_function = "${classname}::${name}";
- my $role_function = "${selfname}::${name}";
- if (defined &$class_function) {
- # XXX what's Moose's behavior?
- #next;
- } else {
- *{$class_function} = \&{$role_function};
- }
- if ($args{alias} && $args{alias}->{$name}) {
- my $dstname = $args{alias}->{$name};
- unless ($classname->can($dstname)) {
- *{"${classname}::${dstname}"} = \&$role_function;
- }
- }
- }
- }
- if ($class->isa('Mouse::Meta::Class')) {
- # apply role to class
- for my $name ($self->get_attribute_list) {
- next if $class->has_attribute($name);
- my $spec = $self->get_attribute($name);
-
- my $metaclass = 'Mouse::Meta::Attribute';
- if ( my $metaclass_name = $spec->{metaclass} ) {
- my $new_class = Mouse::Util::resolve_metaclass_alias(
- 'Attribute',
- $metaclass_name
- );
- if ( $metaclass ne $new_class ) {
- $metaclass = $new_class;
- }
- }
-
- $metaclass->create($class, $name, %$spec);
- }
- } else {
- # apply role to role
- # XXX Room for speed improvement
- for my $name ($self->get_attribute_list) {
- next if $class->has_attribute($name);
- my $spec = $self->get_attribute($name);
- $class->add_attribute($name, $spec);
- }
- }
+sub combine {
+ my($self, @role_specs) = @_;
- # XXX Room for speed improvement in role to role
- for my $modifier_type (qw/before after around override/) {
- my $add_method = "add_${modifier_type}_method_modifier";
- my $modified = $self->{"${modifier_type}_method_modifiers"};
+ require 'Mouse/Meta/Role/Composite.pm';
+ my $composite = Mouse::Meta::Role::Composite->create_anon_role();
- for my $method_name (keys %$modified) {
- for my $code (@{ $modified->{$method_name} }) {
- $class->$add_method($method_name => $code);
- }
- }
+ foreach my $role_spec (@role_specs) {
+ my($role_name, $args) = @{$role_spec};
+ $role_name->meta->apply($composite, %{$args});
}
-
- # append roles
- push @{ $class->roles }, $self, @{ $self->roles };
+ return $composite;
}
-sub combine_apply {
- my(undef, $class, @roles) = @_;
- my $classname = $class->name;
-
- if ($class->isa('Mouse::Meta::Class')) {
- for my $role_spec (@roles) {
- my $self = $role_spec->[0]->meta;
- for my $name (@{$self->{required_methods}}) {
- unless ($classname->can($name)) {
- my $method_required = 0;
- for my $role (@roles) {
- $method_required = 1 if $self->name ne $role->[0] && $role->[0]->can($name);
- }
- confess "'".$self->name."' requires the method '$name' to be implemented by '$classname'"
- unless $method_required;
- }
- }
- }
- }
+sub add_before_method_modifier;
+sub add_around_method_modifier;
+sub add_after_method_modifier;
- {
- no strict 'refs';
- for my $role_spec (@roles) {
- my $self = $role_spec->[0]->meta;
- my $selfname = $self->name;
- my %args = %{ $role_spec->[1] };
- for my $name ($self->get_method_list) {
- next if $name eq 'meta';
-
- my $class_function = "${classname}::${name}";
- my $role_function = "${selfname}::${name}";
- if (defined &$class_function) {
- # XXX what's Moose's behavior?
- #next;
- } else {
- *$class_function = *$role_function;
- }
- if ($args{alias} && $args{alias}->{$name}) {
- my $dstname = $args{alias}->{$name};
- unless ($classname->can($dstname)) {
- *{"${classname}::${dstname}"} = \&$role_function;
- }
- }
- }
- }
- }
+sub get_before_method_modifiers;
+sub get_around_method_modifiers;
+sub get_after_method_modifiers;
+sub add_override_method_modifier{
+ my($self, $method_name, $method) = @_;
- if ($class->isa('Mouse::Meta::Class')) {
- # apply role to class
- for my $role_spec (@roles) {
- my $self = $role_spec->[0]->meta;
- for my $name ($self->get_attribute_list) {
- next if $class->has_attribute($name);
- my $spec = $self->get_attribute($name);
-
- my $metaclass = 'Mouse::Meta::Attribute';
- if ( my $metaclass_name = $spec->{metaclass} ) {
- my $new_class = Mouse::Util::resolve_metaclass_alias(
- 'Attribute',
- $metaclass_name
- );
- if ( $metaclass ne $new_class ) {
- $metaclass = $new_class;
- }
- }
-
- $metaclass->create($class, $name, %$spec);
- }
- }
- } else {
- # apply role to role
- # XXX Room for speed improvement
- for my $role_spec (@roles) {
- my $self = $role_spec->[0]->meta;
- for my $name ($self->get_attribute_list) {
- next if $class->has_attribute($name);
- my $spec = $self->get_attribute($name);
- $class->add_attribute($name, $spec);
- }
- }
+ if($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)");
}
- # XXX Room for speed improvement in role to role
- for my $modifier_type (qw/before after around override/) {
- my $add_method = "add_${modifier_type}_method_modifier";
- for my $role_spec (@roles) {
- my $self = $role_spec->[0]->meta;
- my $modified = $self->{"${modifier_type}_method_modifiers"};
-
- for my $method_name (keys %$modified) {
- for my $code (@{ $modified->{$method_name} }) {
- $class->$add_method($method_name => $code);
- }
- }
- }
- }
-
- # append roles
- my %role_apply_cache;
- my $apply_roles = $class->roles;
- for my $role_spec (@roles) {
- my $self = $role_spec->[0]->meta;
- push @$apply_roles, $self unless $role_apply_cache{$self}++;
- for my $role (@{ $self->roles }) {
- push @$apply_roles, $role unless $role_apply_cache{$role}++;
- }
- }
+ $self->{override_method_modifiers}->{$method_name} = $method;
}
-for my $modifier_type (qw/before after around override/) {
- no strict 'refs';
- *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub {
- my ($self, $method_name, $method) = @_;
-
- push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} },
- $method;
- };
-
- *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub {
- my ($self, $method_name, $method) = @_;
- @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] }
- };
+sub get_override_method_modifier {
+ my ($self, $method_name) = @_;
+ return $self->{override_method_modifiers}->{$method_name};
}
-sub roles { $_[0]->{roles} }
-
-
-# This is currently not passing all the Moose tests.
sub does_role {
my ($self, $role_name) = @_;
(defined $role_name)
- || confess "You must supply a role name to look for";
+ || $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;
-
- for my $role (@{ $self->{roles} }) {
+ # otherwise.. check our children
+ for my $role (@{ $self->get_roles }) {
return 1 if $role->does_role($role_name);
}
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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