-#!/usr/bin/env perl
package Mouse::Meta::Role;
use strict;
use warnings;
-do {
- my %METACLASS_CACHE;
+use Mouse::Util qw(not_supported);
+use base qw(Mouse::Meta::Module);
- # 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 method_metaclass(){ 'Mouse::Meta::Role::Method' } # required for get_method()
-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 get_roles { $_[0]->{roles} }
+
+sub get_required_method_list{
+ return @{ $_[0]->{required_methods} };
+}
+
+sub add_required_methods {
+ my $self = shift;
+ my @methods = @_;
+ push @{$self->{required_methods}}, @methods;
+}
+
+sub requires_method {
+ my($self, $name) = @_;
+ return scalar( grep{ $_ eq $name } @{ $self->{required_methods} } ) != 0;
+}
sub add_attribute {
my $self = shift;
my $name = shift;
- my $spec = shift;
- $self->{attributes}->{$name} = $spec;
+
+ $self->{attributes}->{$name} = (@_ == 1) ? $_[0] : { @_ };
+}
+
+sub _check_required_methods{
+ my($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;
+ }
+ }
+ }
+
+ return;
}
-sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
-sub get_attribute_list { keys %{ $_[0]->{attributes} } }
-sub get_attribute { $_[0]->{attributes}->{$_[1]} }
+sub _apply_methods{
+ my($role, $class, $args) = @_;
+
+ my $role_name = $role->name;
+ my $class_name = $class->name;
+
+ my $alias = (exists $args->{alias} && !exists $args->{-alias}) ? $args->{alias} : $args->{-alias};
+ my $excludes = (exists $args->{excludes} && !exists $args->{-excludes}) ? $args->{excludes} : $args->{-excludes};
+
+ my %exclude_map;
+
+ if(defined $excludes){
+ if(ref $excludes){
+ %exclude_map = map{ $_ => undef } @{$excludes};
+ }
+ else{
+ $exclude_map{$excludes} = undef;
+ }
+ }
+
+ foreach my $method_name($role->get_method_list){
+ next if $method_name eq 'meta';
+
+ my $code = $role_name->can($method_name);
+
+ if(!exists $exclude_map{$method_name}){
+ if(!$class->has_method($method_name)){
+ $class->add_method($method_name => $code);
+ }
+ }
+
+ if($alias && $alias->{$method_name}){
+ my $dstname = $alias->{$method_name};
+
+ my $slot = do{ no strict 'refs'; \*{$class_name . '::' . $dstname} };
+ if(defined(*{$slot}{CODE}) && *{$slot}{CODE} != $code){
+ $class->throw_error("Cannot create a method alias if a local method of the same name exists");
+ }
+ 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 $code(ref($modifier_codes) eq 'ARRAY' ? @{$modifier_codes} : $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, $class, %args) = @_;
+
+ if ($class->isa('Mouse::Object')) {
+ not_supported 'Application::ToInstance';
+ }
+
+ $self->_check_required_methods($class, \%args);
+ $self->_apply_methods($class, \%args);
+ $self->_apply_attributes($class, \%args);
+ $self->_apply_modifiers($class, \%args);
+ $self->_append_roles($class, \%args);
+ return;
+}
+
+sub combine_apply {
+ my(undef, $class, @roles) = @_;
+
+ 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;
+}
+
+for my $modifier_type (qw/before after around/) {
+
+ 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} ||= [] }
+ };
- 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);
+ no strict 'refs';
+ *{ 'add_' . $modifier_type . '_method_modifier' } = $add_method_modifier;
+ *{ 'has_' . $modifier_type . '_method_modifiers' } = $has_method_modifiers;
+ *{ 'get_' . $modifier_type . '_method_modifiers' } = $get_method_modifiers;
+}
+
+sub add_override_method_modifier{
+ my($self, $method_name, $method) = @_;
+
+ (!$self->has_method($method_name))\r
+ || $self->throw_error("Cannot add an override of method '$method_name' " .\r
+ "because there is a local version of '$method_name'");
+
+ $self->{override_method_modifiers}->{$method_name} = $method;
+}
+
+sub has_override_method_modifier {\r
+ my ($self, $method_name) = @_;\r
+ return exists $self->{override_method_modifiers}->{$method_name};\r
+}\r
+\r
+sub get_override_method_modifier {\r
+ my ($self, $method_name) = @_;\r
+ return $self->{override_method_modifiers}->{$method_name};\r
+}
+
+sub get_method_modifier_list {
+ my($self, $modifier_type) = @_;
+
+ return keys %{ $self->{$modifier_type . '_method_modifiers'} };
+}
+
+# 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");
+
+ # 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