Split role application to a module like Moose

[gitmo/Mouse.git] / lib / Mouse / Meta / Role.pm

diff --git a/lib/Mouse/Meta/Role.pm b/lib/Mouse/Meta/Role.pm
index 8e42641..fe6575e 100644 (file)
--- a/lib/Mouse/Meta/Role.pm
+++ b/lib/Mouse/Meta/Role.pm
@@ -1,53 +1,155 @@
-#!/usr/bin/env perl
 package Mouse::Meta::Role;
-use strict;
-use warnings;
-
-do {
-    my %METACLASS_CACHE;
-
-    # 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};
-    }
+use Mouse::Util qw(:meta); # enables strict and warnings
 
-    sub initialize {
-        my $class = shift;
-        my $name  = shift;
-        $METACLASS_CACHE{$name} = $class->new(name => $name)
-            if !exists($METACLASS_CACHE{$name});
-        return $METACLASS_CACHE{$name};
-    }
-};
+use Mouse::Meta::Module;
+our @ISA = qw(Mouse::Meta::Module);
+
+sub method_metaclass;
 
-sub new {
+sub _construct_meta {
     my $class = shift;
+
     my %args  = @_;
 
-    bless \%args, $class;
+    $args{methods}          = {};
+    $args{attributes}       = {};
+    $args{required_methods} = [];
+    $args{roles}            = [];
+
+    my $self = bless \%args, ref($class) || $class;
+    if($class ne __PACKAGE__){
+        $self->meta->_initialize_object($self, \%args);
+    }
+
+    return $self;
+}
+
+sub create_anon_role{
+    my $self = shift;
+    return $self->create(undef, @_);
+}
+
+sub is_anon_role;
+
+sub get_roles;
+
+sub calculate_all_roles {
+    my $self = shift;
+    my %seen;
+    return grep { !$seen{ $_->name }++ }
+           ($self, map  { $_->calculate_all_roles } @{ $self->get_roles });
+}
+
+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($_) } @methods;
+    return;
+}
+
+sub requires_method {
+    my($self, $name) = @_;
+    return scalar( grep{ $_ eq $name } @{ $self->{required_methods} } ) != 0;
 }
 
-sub name { $_[0]->{name} }
+sub add_attribute {
+    my $self = shift;
+    my $name = shift;
 
-sub has_attribute { exists $_[0]->{attributes}->{$_[1]}  }
-sub add_attribute { $_[0]->{attributes}->{$_[1]} = $_[2] }
-sub get_attribute_list {
+    $self->{attributes}->{$name} = (@_ == 1) ? $_[0] : { @_ };
+    return;
 }
 
+
+# Moose uses Application::ToInstance, Application::ToClass, Application::ToRole
 sub apply {
-    my $self  = shift;
-    my $class = shift;
-    my $pkg   = shift;
+    my $self     = shift;
+    my $consumer = shift;
+
+    require 'Mouse/Meta/Role/Application.pm';
+    return Mouse::Meta::Role::Application->new(@_)->apply($self, $consumer);
+}
+
 
-    for my $name ($self->get_attribute_list) {
-        my $attr = $self->get_attribute($name);
-        Mouse::Meta::Attribute->create($pkg, $name, $attr);
+sub combine {
+    my($self, @role_specs) = @_;
+
+    require 'Mouse/Meta/Role/Composite.pm';
+    my $composite = Mouse::Meta::Role::Composite->create_anon_role();
+
+    foreach my $role_spec (@role_specs) {
+        my($role_name, $args) = @{$role_spec};
+        $role_name->meta->apply($composite, %{$args});
+    }
+    return $composite;
+}
+
+sub add_before_method_modifier;
+sub add_around_method_modifier;
+sub add_after_method_modifier;
+
+sub get_before_method_modifiers;
+sub get_around_method_modifiers;
+sub get_after_method_modifiers;
+
+sub add_override_method_modifier{
+    my($self, $method_name, $method) = @_;
+
+    if($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)");
     }
 
+    $self->{override_method_modifiers}->{$method_name} = $method;
+}
+
+sub get_override_method_modifier {
+    my ($self, $method_name) = @_;
+    return $self->{override_method_modifiers}->{$method_name};
+}
+
+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
+    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