use Carp 'confess';
use Scalar::Util 'blessed';
+use B 'svref_2object';
use Moose::Meta::Class;
-our $VERSION = '0.02';
+our $VERSION = '0.04';
-## Attributes
-
-## the meta for the role package
+use base 'Class::MOP::Module';
-__PACKAGE__->meta->add_attribute('_role_meta' => (
- reader => '_role_meta',
- init_arg => ':role_meta'
-));
+## Attributes
## roles
default => sub { [] }
));
+## excluded roles
+
+__PACKAGE__->meta->add_attribute('excluded_roles_map' => (
+ reader => 'get_excluded_roles_map',
+ default => sub { {} }
+));
+
## attributes
__PACKAGE__->meta->add_attribute('attribute_map' => (
default => sub { {} }
));
-## method modifiers
-
-__PACKAGE__->meta->add_attribute('before_method_modifiers' => (
- reader => 'get_before_method_modifiers_map',
- default => sub { {} } # (<name> => [ (CODE) ])
-));
-
-__PACKAGE__->meta->add_attribute('after_method_modifiers' => (
- reader => 'get_after_method_modifiers_map',
- default => sub { {} } # (<name> => [ (CODE) ])
-));
-
-__PACKAGE__->meta->add_attribute('around_method_modifiers' => (
- reader => 'get_around_method_modifiers_map',
- default => sub { {} } # (<name> => [ (CODE) ])
-));
-
-__PACKAGE__->meta->add_attribute('override_method_modifiers' => (
- reader => 'get_override_method_modifiers_map',
- default => sub { {} } # (<name> => CODE)
-));
-
## Methods
-sub new {
- my $class = shift;
- my %options = @_;
- $options{':role_meta'} = Moose::Meta::Class->initialize(
- $options{role_name},
- ':method_metaclass' => 'Moose::Meta::Role::Method'
- );
- my $self = $class->meta->new_object(%options);
- return $self;
-}
+sub method_metaclass { 'Moose::Meta::Role::Method' }
## subroles
push @{$self->get_roles} => $role;
}
+sub calculate_all_roles {
+ my $self = shift;
+ my %seen;
+ grep { !$seen{$_->name}++ } $self, map { $_->calculate_all_roles } @{ $self->get_roles };
+}
+
sub does_role {
my ($self, $role_name) = @_;
(defined $role_name)
return 0;
}
+## excluded roles
+
+sub add_excluded_roles {
+ my ($self, @excluded_role_names) = @_;
+ $self->get_excluded_roles_map->{$_} = undef foreach @excluded_role_names;
+}
+
+sub get_excluded_roles_list {
+ my ($self) = @_;
+ keys %{$self->get_excluded_roles_map};
+}
+
+sub excludes_role {
+ my ($self, $role_name) = @_;
+ exists $self->get_excluded_roles_map->{$role_name} ? 1 : 0;
+}
+
## required methods
sub add_required_methods {
$self->get_required_methods_map->{$_} = undef foreach @methods;
}
+sub remove_required_methods {
+ my ($self, @methods) = @_;
+ delete $self->get_required_methods_map->{$_} foreach @methods;
+}
+
sub get_required_method_list {
my ($self) = @_;
keys %{$self->get_required_methods_map};
exists $self->get_required_methods_map->{$method_name} ? 1 : 0;
}
-## methods
-
-# NOTE:
-# we delegate to some role_meta methods for convience here
-# the Moose::Meta::Role is meant to be a read-only interface
-# to the underlying role package, if you want to manipulate
-# that, just use ->role_meta
+sub _clean_up_required_methods {
+ my $self = shift;
+ foreach my $method ($self->get_required_method_list) {
+ $self->remove_required_methods($method)
+ if $self->has_method($method);
+ }
+}
-sub name { (shift)->_role_meta->name }
-sub version { (shift)->_role_meta->version }
+## methods
-sub get_method { (shift)->_role_meta->get_method(@_) }
-sub has_method { (shift)->_role_meta->has_method(@_) }
-sub alias_method { (shift)->_role_meta->alias_method(@_) }
+sub get_method { (shift)->Moose::Meta::Class::get_method(@_) }
+sub find_method_by_name { (shift)->Moose::Meta::Class::find_method_by_name(@_) }
+sub has_method { (shift)->Moose::Meta::Class::has_method(@_) }
+sub alias_method { (shift)->Moose::Meta::Class::alias_method(@_) }
sub get_method_list {
my ($self) = @_;
grep {
# but they do, so we need to switch Moose::Role
# and Moose to use Sub::Exporter to prevent this
!/^(meta|has|extends|blessed|confess|augment|inner|override|super|before|after|around|with|requires)$/
- } $self->_role_meta->get_method_list;
+ } $self->Moose::Meta::Class::get_method_list;
}
# ... however the items in statis (attributes & method modifiers)
# attributes
sub add_attribute {
- my ($self, $name, %attr_desc) = @_;
- $self->get_attribute_map->{$name} = \%attr_desc;
+ my $self = shift;
+ my $name = shift;
+ my $attr_desc;
+ if (scalar @_ == 1 && ref($_[0]) eq 'HASH') {
+ $attr_desc = $_[0];
+ }
+ else {
+ $attr_desc = { @_ };
+ }
+ $self->get_attribute_map->{$name} = $attr_desc;
}
sub has_attribute {
keys %{$self->get_attribute_map};
}
-# method modifiers
-
-# mimic the metaclass API
-sub add_before_method_modifier { (shift)->_add_method_modifier('before', @_) }
-sub add_around_method_modifier { (shift)->_add_method_modifier('around', @_) }
-sub add_after_method_modifier { (shift)->_add_method_modifier('after', @_) }
-
-sub _add_method_modifier {
- my ($self, $modifier_type, $method_name, $method) = @_;
- my $accessor = "get_${modifier_type}_method_modifiers_map";
- $self->$accessor->{$method_name} = []
- unless exists $self->$accessor->{$method_name};
- push @{$self->$accessor->{$method_name}} => $method;
-}
-
-sub add_override_method_modifier {
- my ($self, $method_name, $method) = @_;
- $self->get_override_method_modifiers_map->{$method_name} = $method;
-}
-
-sub has_before_method_modifiers { (shift)->_has_method_modifiers('before', @_) }
-sub has_around_method_modifiers { (shift)->_has_method_modifiers('around', @_) }
-sub has_after_method_modifiers { (shift)->_has_method_modifiers('after', @_) }
-
-# override just checks for one,..
-# but we can still re-use stuff
-sub has_override_method_modifier { (shift)->_has_method_modifiers('override', @_) }
-sub _has_method_modifiers {
- my ($self, $modifier_type, $method_name) = @_;
- my $accessor = "get_${modifier_type}_method_modifiers_map";
- # NOTE:
- # for now we assume that if it exists,..
- # it has at least one modifier in it
- (exists $self->$accessor->{$method_name}) ? 1 : 0;
-}
-
-sub get_before_method_modifiers { (shift)->_get_method_modifiers('before', @_) }
-sub get_around_method_modifiers { (shift)->_get_method_modifiers('around', @_) }
-sub get_after_method_modifiers { (shift)->_get_method_modifiers('after', @_) }
-
-sub _get_method_modifiers {
- my ($self, $modifier_type, $method_name) = @_;
- my $accessor = "get_${modifier_type}_method_modifiers_map";
- @{$self->$accessor->{$method_name}};
-}
-
-sub get_override_method_modifier {
- my ($self, $method_name) = @_;
- $self->get_override_method_modifiers_map->{$method_name};
-}
+## applying a role to a class ...
-sub get_method_modifier_list {
- my ($self, $modifier_type) = @_;
- my $accessor = "get_${modifier_type}_method_modifiers_map";
- keys %{$self->$accessor};
+sub _check_excluded_roles {
+ my ($self, $other) = @_;
+ if ($other->excludes_role($self->name)) {
+ confess "Conflict detected: " . $other->name . " excludes role '" . $self->name . "'";
+ }
+ foreach my $excluded_role_name ($self->get_excluded_roles_list) {
+ if ($other->does_role($excluded_role_name)) {
+ confess "The class " . $other->name . " does the excluded role '$excluded_role_name'";
+ }
+ else {
+ if ($other->isa('Moose::Meta::Role')) {
+ $other->add_excluded_roles($excluded_role_name);
+ }
+ # else -> ignore it :)
+ }
+ }
}
-## applying a role to a class ...
-
-sub apply {
+sub _check_required_methods {
my ($self, $other) = @_;
-
# NOTE:
# we might need to move this down below the
# the attributes so that we can require any
# that maybe those are somehow exempt from
# the require methods stuff.
foreach my $required_method_name ($self->get_required_method_list) {
- unless ($other->has_method($required_method_name)) {
+
+ unless ($other->find_method_by_name($required_method_name)) {
if ($other->isa('Moose::Meta::Role')) {
$other->add_required_methods($required_method_name);
}
}
}
}
-
+}
+
+sub _apply_attributes {
+ my ($self, $other) = @_;
foreach my $attribute_name ($self->get_attribute_list) {
- # skip it if it has one already
- next if $other->has_attribute($attribute_name);
- # add it, although it could be overriden
- $other->add_attribute(
- $attribute_name,
- %{$self->get_attribute($attribute_name)}
- );
- }
-
- foreach my $method_name ($self->get_method_list) {
- # skip it if it has one already
- next if $other->has_method($method_name);
- # add it, although it could be overriden
- $other->alias_method(
- $method_name,
- $self->get_method($method_name)
- );
+ # it if it has one already
+ if ($other->has_attribute($attribute_name) &&
+ # make sure we haven't seen this one already too
+ $other->get_attribute($attribute_name) != $self->get_attribute($attribute_name)) {
+ # see if we are being composed
+ # into a role or not
+ if ($other->isa('Moose::Meta::Role')) {
+ # all attribute conflicts between roles
+ # result in an immediate fatal error
+ confess "Role '" . $self->name . "' has encountered an attribute conflict " .
+ "during composition. This is fatal error and cannot be disambiguated.";
+ }
+ else {
+ # but if this is a class, we
+ # can safely skip adding the
+ # attribute to the class
+ next;
+ }
+ }
+ else {
+ $other->add_attribute(
+ $attribute_name,
+ $self->get_attribute($attribute_name)
+ );
+ }
}
+}
+
+sub _apply_methods {
+ my ($self, $other) = @_;
+ foreach my $method_name ($self->get_method_list) {
+ # it if it has one already
+ if ($other->has_method($method_name) &&
+ # and if they are not the same thing ...
+ $other->get_method($method_name) != $self->get_method($method_name)) {
+ # see if we are composing into a role
+ if ($other->isa('Moose::Meta::Role')) {
+ # method conflicts between roles result
+ # in the method becoming a requirement
+ $other->add_required_methods($method_name);
+ # NOTE:
+ # we have to remove the method from our
+ # role, if this is being called from combine()
+ # which means the meta is an anon class
+ # this *may* cause problems later, but it
+ # is probably fairly safe to assume that
+ # anon classes will only be used internally
+ # or by people who know what they are doing
+ $other->Moose::Meta::Class::remove_method($method_name)
+ if $other->name =~ /__ANON__/;
+ }
+ else {
+ next;
+ }
+ }
+ else {
+ # add it, although it could be overriden
+ $other->alias_method(
+ $method_name,
+ $self->get_method($method_name)
+ );
+ }
+ }
+}
+
+sub apply {
+ my ($self, $other) = @_;
- foreach my $method_name ($self->get_method_modifier_list('override')) {
- # skip it if it has one already
- next if $other->has_method($method_name);
- # add it, although it could be overriden
- $other->add_override_method_modifier(
- $method_name,
- $self->get_override_method_modifier($method_name),
- $self->name
- );
- }
+ ($other->isa('Moose::Meta::Class') || $other->isa('Moose::Meta::Role'))
+ || confess "You must apply a role to a metaclass, not ($other)";
- foreach my $method_name ($self->get_method_modifier_list('before')) {
- $other->add_before_method_modifier(
- $method_name,
- $_
- ) foreach $self->get_before_method_modifiers($method_name);
- }
+ $self->_check_excluded_roles($other);
+ $self->_check_required_methods($other);
+
+ $self->_apply_attributes($other);
+ $self->_apply_methods($other);
+
+ $other->add_role($self);
+}
+
+my $anon_counter = 0;
+
+sub combine {
+ my ($class, @roles) = @_;
- foreach my $method_name ($self->get_method_modifier_list('after')) {
- $other->add_after_method_modifier(
- $method_name,
- $_
- ) foreach $self->get_after_method_modifiers($method_name);
- }
+ my $pkg_name = __PACKAGE__ . "::__ANON__::" . $anon_counter++;
+ eval "package " . $pkg_name . "; our \$VERSION = '0.00';";
+ die $@ if $@;
- foreach my $method_name ($self->get_method_modifier_list('around')) {
- $other->add_around_method_modifier(
- $method_name,
- $_
- ) foreach $self->get_around_method_modifiers($method_name);
- }
+ my $combined = $class->initialize($pkg_name);
- $other->add_role($self);
+ foreach my $role (@roles) {
+ $role->apply($combined);
+ }
+
+ $combined->_clean_up_required_methods;
+
+ return $combined;
}
package Moose::Meta::Role::Method;
=head1 DESCRIPTION
Moose's Roles are being actively developed, please see L<Moose::Role>
-for more information.
+for more information. For the most part, this has no user-serviceable
+parts inside. It's API is still subject to some change (although
+probably not that much really).
=head1 METHODS
=item B<apply>
+=item B<combine>
+
=back
=over 4
=over 4
+=item B<add_excluded_roles>
+
+=item B<excludes_role>
+
+=item B<get_excluded_roles_list>
+
+=item B<get_excluded_roles_map>
+
+=item B<calculate_all_roles>
+
+=back
+
+=over 4
+
+=item B<method_metaclass>
+
+=item B<find_method_by_name>
+
=item B<get_method>
=item B<has_method>
=item B<add_required_methods>
+=item B<remove_required_methods>
+
=item B<get_required_method_list>
=item B<get_required_methods_map>
=back
-=over 4
-
-=item B<add_after_method_modifier>
-
-=item B<add_around_method_modifier>
-
-=item B<add_before_method_modifier>
-
-=item B<add_override_method_modifier>
-
-=over 4
-
-=back
-
-=item B<has_after_method_modifiers>
-
-=item B<has_around_method_modifiers>
-
-=item B<has_before_method_modifiers>
-
-=item B<has_override_method_modifier>
-
-=over 4
-
-=back
-
-=item B<get_after_method_modifiers>
-
-=item B<get_around_method_modifiers>
-
-=item B<get_before_method_modifiers>
-
-=item B<get_method_modifier_list>
-
-=over 4
-
-=back
-
-=item B<get_override_method_modifier>
-
-=item B<get_after_method_modifiers_map>
-
-=item B<get_around_method_modifiers_map>
-
-=item B<get_before_method_modifiers_map>
-
-=item B<get_override_method_modifiers_map>
-
-=back
-
=head1 BUGS
All complex software has bugs lurking in it, and this module is no
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
-=cut
\ No newline at end of file
+=cut
projects / gitmo/Moose.git / blobdiff