-#!/usr/bin/env perl
package Mouse::Meta::Role;
use strict;
use warnings;
+use Carp 'confess';
+
+use Mouse::Util qw(version authority identifier);
do {
my %METACLASS_CACHE;
my $class = shift;
my %args = @_;
- $args{attributes} ||= {};
+ $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;
my $name = shift;
sub get_attribute_list { keys %{ $_[0]->{attributes} } }
sub get_attribute { $_[0]->{attributes}->{$_[1]} }
+# copied from Class::Inspector
+sub get_method_list {
+ 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;
+}
+
+# Moose uses Application::ToInstance, Application::ToClass, Application::ToRole
sub apply {
my $self = shift;
+ my $selfname = $self->name;
my $class = shift;
- my $pkg = $class->name;
+ my $classname = $class->name;
+ my %args = @_;
+
+ if ($class->isa('Mouse::Object')) {
+ Carp::croak('Mouse does not support Application::ToInstance yet');
+ }
+
+ 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'";
+ }
+ }
+ }
+
+ {
+ 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);
+ }
+ }
+
+ # 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"};
+
+ for my $method_name (keys %$modified) {
+ for my $code (@{ $modified->{$method_name} }) {
+ $class->$add_method($method_name => $code);
+ }
+ }
+ }
+
+ # append roles
+ push @{ $class->roles }, $self, @{ $self->roles };
+}
- for my $name ($self->get_attribute_list) {
- next if $class->has_attribute($name);
- my $spec = $self->get_attribute($name);
- Mouse::Meta::Attribute->create($pkg, $name, %$spec);
+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;
+ }
+ }
+ }
+ }
+
+ {
+ 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}"} = \&$role_function;
+ }
+ }
+ }
+ }
+ }
+
+
+ if ($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);
+ }
+ }
+ }
+
+ # 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}++;
+ }
}
}
+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 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;
+
+ for my $role (@{ $self->{roles} }) {
+ return 1 if $role->does_role($role_name);
+ }
+ return 0;
+}
+
+
1;
projects / gitmo/Mouse.git / blobdiff