package Moose::Meta::Role::Application::ToClass;
use strict;
use warnings;
use metaclass;
use Carp 'confess';
use Scalar::Util 'blessed';
use Data::Dumper;
our $VERSION = '0.01';
our $AUTHORITY = 'cpan:STEVAN';
use base 'Moose::Meta::Role::Application';
sub apply {
my ($self, $role, $class) = @_;
$self->SUPER::apply($role, $class);
$class->add_role($role);
}
sub check_role_exclusions {
my ($self, $role, $class) = @_;
if ($class->excludes_role($role->name)) {
confess "Conflict detected: " . $class->name . " excludes role '" . $role->name . "'";
}
foreach my $excluded_role_name ($role->get_excluded_roles_list) {
if ($class->does_role($excluded_role_name)) {
confess "The class " . $class->name . " does the excluded role '$excluded_role_name'";
}
}
}
sub check_required_methods {
my ($self, $role, $class) = @_;
# NOTE:
# we might need to move this down below the
# the attributes so that we can require any
# attribute accessors. However I am thinking
# that maybe those are somehow exempt from
# the require methods stuff.
foreach my $required_method_name ($role->get_required_method_list) {
if (!$class->find_method_by_name($required_method_name)) {
next if $self->is_aliased_method($required_method_name);
confess "'" . $role->name . "' requires the method '$required_method_name' " .
"to be implemented by '" . $class->name . "'";
}
else {
# NOTE:
# we need to make sure that the method is
# not a method modifier, because those do
# not satisfy the requirements ...
my $method = $class->find_method_by_name($required_method_name);
# check if it is a generated accessor ...
(!$method->isa('Class::MOP::Method::Accessor'))
|| confess "'" . $role->name . "' requires the method '$required_method_name' " .
"to be implemented by '" . $class->name . "', the method is only an attribute accessor";
# NOTE:
# All other tests here have been removed, they were tests
# for overriden methods and before/after/around modifiers.
# But we realized that for classes any overriden or modified
# methods would be backed by a real method of that name
# (and therefore meet the requirement). And for roles, the
# overriden and modified methods are "in statis" and so would
# not show up in this test anyway (and as a side-effect they
# would not fufill the requirement, which is exactly what we
# want them to do anyway).
# - SL
}
}
}
sub check_required_attributes {
}
sub apply_attributes {
my ($self, $role, $class) = @_;
foreach my $attribute_name ($role->get_attribute_list) {
# it if it has one already
if ($class->has_attribute($attribute_name) &&
# make sure we haven't seen this one already too
$class->get_attribute($attribute_name) != $role->get_attribute($attribute_name)) {
next;
}
else {
$class->add_attribute(
$attribute_name,
$role->get_attribute($attribute_name)
);
}
}
}
sub apply_methods {
my ($self, $role, $class) = @_;
foreach my $method_name ($role->get_method_list) {
next if $self->is_method_excluded($method_name);
# it if it has one already
if ($class->has_method($method_name) &&
# and if they are not the same thing ...
$class->get_method($method_name)->body != $role->get_method($method_name)->body) {
next;
}
else {
# add it, although it could be overriden
$class->alias_method(
$method_name,
$role->get_method($method_name)
);
}
if ($self->is_method_aliased($method_name)) {
my $aliased_method_name = $self->get_method_aliases->{$method_name};
# it if it has one already
if ($class->has_method($aliased_method_name) &&
# and if they are not the same thing ...
$class->get_method($aliased_method_name)->body != $role->get_method($method_name)->body) {
confess "Cannot create a method alias if a local method of the same name exists";
}
$class->alias_method(
$aliased_method_name,
$role->get_method($method_name)
);
}
}
# we must reset the cache here since
# we are just aliasing methods, otherwise
# the modifiers go wonky.
$class->reset_package_cache_flag;
}
sub apply_override_method_modifiers {
my ($self, $role, $class) = @_;
foreach my $method_name ($role->get_method_modifier_list('override')) {
# it if it has one already then ...
if ($class->has_method($method_name)) {
next;
}
else {
# if this is not a role, then we need to
# find the original package of the method
# so that we can tell the class were to
# find the right super() method
my $method = $role->get_override_method_modifier($method_name);
my ($package) = Class::MOP::get_code_info($method);
# if it is a class, we just add it
$class->add_override_method_modifier($method_name, $method, $package);
}
}
}
sub apply_method_modifiers {
my ($self, $modifier_type, $role, $class) = @_;
my $add = "add_${modifier_type}_method_modifier";
my $get = "get_${modifier_type}_method_modifiers";
foreach my $method_name ($role->get_method_modifier_list($modifier_type)) {
$class->$add(
$method_name,
$_
) foreach $role->$get($method_name);
}
}
1;
__END__
=pod
=head1 NAME
Moose::Meta::Role::Application::ToClass
=head1 DESCRIPTION
=head2 METHODS
=over 4
=item B<new>
=item B<meta>
=item B<apply>
=item B<check_role_exclusions>
=item B<check_required_methods>
=item B<check_required_attributes>
=item B<apply_attributes>
=item B<apply_methods>
=item B<apply_method_modifiers>
=item B<apply_override_method_modifiers>
=back
=head1 BUGS
All complex software has bugs lurking in it, and this module is no
exception. If you find a bug please either email me, or add the bug
to cpan-RT.
=head1 AUTHOR
Stevan Little E<lt>stevan@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut