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 method_metaclass { 'Moose::Meta::Role::Method' }
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};
+ my $modifiers = $self->$accessor->{$method_name};
+ # NOTE:
+ # check to see that we aren't adding the
+ # same code twice. We err in favor of the
+ # first on here, this may not be as expected
+ foreach my $modifier (@{$modifiers}) {
+ return if $modifier == $method;
+ }
+ push @{$modifiers} => $method;
+}
+
+sub add_override_method_modifier {
+ my ($self, $method_name, $method) = @_;
+ (!$self->has_method($method_name))
+ || confess "Cannot add an override of method '$method_name' " .
+ "because there is a local version of '$method_name'";
+ $self->get_override_method_modifiers_map->{$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};
+}
+
+sub get_method_modifier_list {
+ my ($self, $modifier_type) = @_;
+ my $accessor = "get_${modifier_type}_method_modifiers_map";
+ keys %{$self->$accessor};
+}
## applying a role to a class ...
"to be implemented by '" . $other->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 = $other->get_method($required_method_name);
+ # check if it is an override or a generated accessor ..
+ (!$method->isa('Moose::Meta::Method::Overriden') &&
+ !$method->isa('Class::MOP::Attribute::Accessor'))
+ || confess "'" . $self->name . "' requires the method '$required_method_name' " .
+ "to be implemented by '" . $other->name . "', the method is only a method modifier";
+ # before/after/around methods are a little trickier
+ # since we wrap the original local method (if applicable)
+ # so we need to check if the original wrapped method is
+ # from the same package, and not a wrap of the super method
+ if ($method->isa('Class::MOP::Method::Wrapped')) {
+ ($method->get_original_method->package_name eq $other->name)
+ || confess "'" . $self->name . "' requires the method '$required_method_name' " .
+ "to be implemented by '" . $other->name . "', the method is only a method modifier";
+ }
+ }
}
}
}
}
+sub _apply_override_method_modifiers {
+ my ($self, $other) = @_;
+ foreach my $method_name ($self->get_method_modifier_list('override')) {
+ # it if it has one already then ...
+ if ($other->has_method($method_name)) {
+ # if it is being composed into another role
+ # we have a conflict here, because you cannot
+ # combine an overriden method with a locally
+ # defined one
+ if ($other->isa('Moose::Meta::Role')) {
+ confess "Role '" . $self->name . "' has encountered an 'override' method conflict " .
+ "during composition (A local method of the same name as been found). This " .
+ "is fatal error.";
+ }
+ else {
+ # if it is a class, then we
+ # just ignore this here ...
+ next;
+ }
+ }
+ else {
+ # if no local method is found, then we
+ # must check if we are a role or class
+ if ($other->isa('Moose::Meta::Role')) {
+ # if we are a role, we need to make sure
+ # we dont have a conflict with the role
+ # we are composing into
+ if ($other->has_override_method_modifier($method_name) &&
+ $other->get_override_method_modifier($method_name) != $self->get_override_method_modifier($method_name)) {
+ confess "Role '" . $self->name . "' has encountered an 'override' method conflict " .
+ "during composition (Two 'override' methods of the same name encountered). " .
+ "This is fatal error.";
+ }
+ else {
+ # if there is no conflict,
+ # just add it to the role
+ $other->add_override_method_modifier(
+ $method_name,
+ $self->get_override_method_modifier($method_name)
+ );
+ }
+ }
+ 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 = $self->get_override_method_modifier($method_name);
+ my $package = svref_2object($method)->GV->STASH->NAME;
+ # if it is a class, we just add it
+ $other->add_override_method_modifier($method_name, $method, $package);
+ }
+ }
+ }
+}
+
+sub _apply_method_modifiers {
+ my ($self, $modifier_type, $other) = @_;
+ my $add = "add_${modifier_type}_method_modifier";
+ my $get = "get_${modifier_type}_method_modifiers";
+ foreach my $method_name ($self->get_method_modifier_list($modifier_type)) {
+ $other->$add(
+ $method_name,
+ $_
+ ) foreach $self->$get($method_name);
+ }
+}
+
+sub _apply_before_method_modifiers { (shift)->_apply_method_modifiers('before' => @_) }
+sub _apply_around_method_modifiers { (shift)->_apply_method_modifiers('around' => @_) }
+sub _apply_after_method_modifiers { (shift)->_apply_method_modifiers('after' => @_) }
+
sub apply {
my ($self, $other) = @_;
$self->_check_required_methods($other);
$self->_apply_attributes($other);
- $self->_apply_methods($other);
+ $self->_apply_methods($other);
+
+ $self->_apply_override_method_modifiers($other);
+ $self->_apply_before_method_modifiers($other);
+ $self->_apply_around_method_modifiers($other);
+ $self->_apply_after_method_modifiers($other);
$other->add_role($self);
}
=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
projects / gitmo/Moose.git / blobdiff