-#!/usr/bin/env perl
package Mouse::Meta::Role;
use strict;
use warnings;
+use Carp 'confess';
+
+use base qw(Mouse::Meta::Module);
do {
my %METACLASS_CACHE;
}
sub initialize {
- my $class = shift;
- my $name = shift;
- $METACLASS_CACHE{$name} = $class->new(name => $name)
- if !exists($METACLASS_CACHE{$name});
- return $METACLASS_CACHE{$name};
+ my($class, $package_name, @args) = @_;
+
+ ($package_name && !ref($package_name))\r
+ || confess("You must pass a package name and it cannot be blessed");\r
+
+ return $METACLASS_CACHE{$package_name}
+ ||= $class->_new(package => $package_name, @args);
}
};
-sub new {
+sub _new {
my $class = shift;
my %args = @_;
- $args{attributes} ||= {};
+ $args{methods} ||= {};
+ $args{attributes} ||= {};
+ $args{required_methods} ||= [];
+ $args{roles} ||= [];
bless \%args, $class;
}
-sub name { $_[0]->{name} }
+sub add_required_methods {
+ my $self = shift;
+ my @methods = @_;
+ push @{$self->{required_methods}}, @methods;
+}
sub add_attribute {
my $self = shift;
sub get_attribute_list { keys %{ $_[0]->{attributes} } }
sub get_attribute { $_[0]->{attributes}->{$_[1]} }
+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)){
+ $has_method = 1;
+ last;
+ }
+ }
+
+ confess "'$role_name' requires the method '$method_name' to be implemented by '$class_name'"
+ unless $has_method;
+ }
+ }
+ }
+
+ return;
+}
+
+sub _apply_methods{
+ my($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 => $code);
+ }
+ }
+ }
+
+ return;
+}
+
+sub _apply_attributes{
+ my($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 => $spec);
+ }
+ }
+
+ return;
+}
+
+sub _apply_modifiers{
+ my($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"};
+
+ while(my($method_name, $modifier_codes) = each %{$modifiers}){
+ foreach my $code(@{$modifier_codes}){
+ $class->$add_modifier($method_name => $code);
+ }
+ }
+ }
+ return;
+}
+
+sub _append_roles{
+ my($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;
+}
+
+# Moose uses Application::ToInstance, Application::ToClass, Application::ToRole
sub apply {
- my $self = shift;
- my $class = shift;
+ my($self, $class, %args) = @_;
- for my $name ($self->get_attribute_list) {
- next if $class->has_attribute($name);
- my $spec = $self->get_attribute($name);
- Mouse::Meta::Attribute->create($class, $name, %$spec);
+ if ($class->isa('Mouse::Object')) {
+ Carp::croak('Mouse does not support Application::ToInstance yet');
}
+
+ $self->_check_required_methods($class, \%args);
+ $self->_apply_methods($class, \%args);
+ $self->_apply_attributes($class, \%args);
+ $self->_apply_modifiers($class, \%args);
+ $self->_append_roles($class, \%args);
+ return;
}
-for my $modifier_type (qw/before after around/) {
- no strict 'refs';
- *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub {
- my ($self, $method_name, $method) = @_;
+sub combine_apply {
+ my(undef, $class, @roles) = @_;
- push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} },
- $method;
- };
+ foreach my $role_spec (@roles) {
+ my($role_name, $args) = @{$role_spec};
+
+ my $role = $role_name->meta;
+
+ $role->_check_required_methods($class, $args, @roles);
+ $role->_apply_methods($class, $args);
+ $role->_apply_attributes($class, $args);
+ $role->_apply_modifiers($class, $args);
+ $role->_append_roles($class, $args);
+ }
+ return;
+}
- *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub {
+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) = @_;
- @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] }
+
+ push @{ $self->{$modifier}->{$method_name} ||= [] }, $method;
+ return;
+ };
+ 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;
+ *{ 'get_' . $modifier_type . '_method_modifiers' } = $get_method_modifiers;
+}
+
+sub get_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";
+
+ # if we are it,.. then return true
+ return 1 if $role_name eq $self->name;
+ # otherwise.. check our children
+ for my $role (@{ $self->get_roles }) {
+ return 1 if $role->does_role($role_name);
+ }
+ return 0;
}
+
1;
projects / gitmo/Mouse.git / blobdiff