use Sub::Name 'subname';
use overload ();
-our $VERSION = '0.20';
+our $VERSION = '0.22';
our $AUTHORITY = 'cpan:STEVAN';
use Moose::Meta::Method::Accessor;
+use Moose::Util ();
use Moose::Util::TypeConstraints ();
use base 'Class::MOP::Attribute';
reader => 'documentation',
predicate => 'has_documentation',
));
+__PACKAGE__->meta->add_attribute('traits' => (
+ reader => 'applied_traits',
+ predicate => 'has_applied_traits',
+));
+
+# NOTE:
+# we need to have a ->does method in here to
+# more easily support traits, and the introspection
+# of those traits. So in order to do this we
+# just alias Moose::Object's version of it.
+# - SL
+*does = \&Moose::Object::does;
sub new {
my ($class, $name, %options) = @_;
return $class->SUPER::new($name, %options);
}
+sub interpolate_class_and_new {
+ my ($class, $name, @args) = @_;
+
+ $class->interpolate_class(@args)->new($name, @args);
+}
+
+sub interpolate_class {
+ my ($class, %options) = @_;
+
+ if ( my $metaclass_name = $options{metaclass} ) {
+ $class = Moose::Util::resolve_metaclass_alias( Attribute => $metaclass_name );
+ }
+
+ if (my $traits = $options{traits}) {
+ my @traits = map {
+ Moose::Util::resolve_metatrait_alias( Attribute => $_ )
+ or
+ $_
+ } @$traits;
+
+ my $anon_class = Moose::Meta::Class->create_anon_class(
+ superclasses => [ $class ],
+ roles => [ @traits ],
+ cache => 1,
+ );
+
+ return $anon_class->name;
+ }
+ else {
+ return $class;
+ }
+}
+
sub clone_and_inherit_options {
my ($self, %options) = @_;
- # you can change default, required, coerce, documentation and lazy
+ # you can change default, required, coerce, documentation, lazy, handles, builder, metaclass and traits
my %actual_options;
- foreach my $legal_option (qw(default coerce required documentation lazy)) {
+ foreach my $legal_option (qw(default coerce required documentation lazy handles builder metaclass traits)) {
if (exists $options{$legal_option}) {
$actual_options{$legal_option} = $options{$legal_option};
delete $options{$legal_option};
}
}
- # handles can only be added, not changed
- if ($options{handles}) {
- confess "You can only add the 'handles' option, you cannot change it"
- if $self->has_handles;
- $actual_options{handles} = $options{handles};
- delete $options{handles};
- }
-
- # isa can be changed, but only if the
- # new type is a subtype
if ($options{isa}) {
my $type_constraint;
if (blessed($options{isa}) && $options{isa}->isa('Moose::Meta::TypeConstraint')) {
$type_constraint = $options{isa};
}
else {
- $type_constraint = Moose::Util::TypeConstraints::find_or_create_type_constraint(
- $options{isa}
- );
+ $type_constraint = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options{isa});
(defined $type_constraint)
|| confess "Could not find the type constraint '" . $options{isa} . "'";
}
- # NOTE:
- # check here to see if the new type
- # is a subtype of the old one
- ($type_constraint->is_subtype_of($self->type_constraint->name))
- || confess "New type constraint setting must be a subtype of inherited one"
- # iff we have a type constraint that is ...
- if $self->has_type_constraint;
- # then we use it :)
+
$actual_options{type_constraint} = $type_constraint;
delete $options{isa};
}
+
+ if ($options{does}) {
+ my $type_constraint;
+ if (blessed($options{does}) && $options{does}->isa('Moose::Meta::TypeConstraint')) {
+ $type_constraint = $options{does};
+ }
+ else {
+ $type_constraint = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options{does});
+ (defined $type_constraint)
+ || confess "Could not find the type constraint '" . $options{does} . "'";
+ }
+
+ $actual_options{type_constraint} = $type_constraint;
+ delete $options{does};
+ }
+
(scalar keys %options == 0)
|| confess "Illegal inherited options => (" . (join ', ' => keys %options) . ")";
$self->clone(%actual_options);
if ($options->{is} eq 'ro') {
$options->{reader} ||= $name;
(!exists $options->{trigger})
- || confess "Cannot have a trigger on a read-only attribute";
+ || confess "Cannot have a trigger on a read-only attribute $name";
}
elsif ($options->{is} eq 'rw') {
$options->{accessor} = $name;
if exists $options->{trigger};
}
else {
- confess "I do not understand this option (is => " . $options->{is} . ")"
+ confess "I do not understand this option (is => " . $options->{is} . ") on attribute $name"
}
}
if (exists $options->{does}) {
if (eval { $options->{isa}->can('does') }) {
($options->{isa}->does($options->{does}))
- || confess "Cannot have an isa option and a does option if the isa does not do the does";
+ || confess "Cannot have an isa option and a does option if the isa does not do the does on attribute $name";
}
else {
- confess "Cannot have an isa option which cannot ->does()";
+ confess "Cannot have an isa option which cannot ->does() on attribute $name";
}
}
$options->{type_constraint} = $options->{isa};
}
else {
- $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_type_constraint(
- $options->{isa} => {
- parent => Moose::Util::TypeConstraints::find_type_constraint('Object'),
- constraint => sub { $_[0]->isa($options->{isa}) }
- }
- );
+ $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options->{isa});
}
}
elsif (exists $options->{does}) {
$options->{type_constraint} = $options->{does};
}
else {
- $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_type_constraint(
- $options->{does} => {
- parent => Moose::Util::TypeConstraints::find_type_constraint('Role'),
- constraint => sub {
- Moose::Util::does_role($_[0], $options->{does})
- }
- }
- );
+ $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options->{does});
}
}
if (exists $options->{coerce} && $options->{coerce}) {
(exists $options->{type_constraint})
- || confess "You cannot have coercion without specifying a type constraint";
- confess "You cannot have a weak reference to a coerced value"
+ || confess "You cannot have coercion without specifying a type constraint on attribute $name";
+ confess "You cannot have a weak reference to a coerced value on attribute $name"
if $options->{weak_ref};
}
if (exists $options->{auto_deref} && $options->{auto_deref}) {
(exists $options->{type_constraint})
- || confess "You cannot auto-dereference without specifying a type constraint";
+ || confess "You cannot auto-dereference without specifying a type constraint on attribute $name";
($options->{type_constraint}->is_a_type_of('ArrayRef') ||
$options->{type_constraint}->is_a_type_of('HashRef'))
- || confess "You cannot auto-dereference anything other than a ArrayRef or HashRef";
+ || confess "You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute $name";
}
if (exists $options->{lazy_build} && $options->{lazy_build} == 1) {
- confess("You can not use lazy_build and default for the same attribute")
+ confess("You can not use lazy_build and default for the same attribute $name")
if exists $options->{default};
$options->{lazy} = 1;
$options->{required} = 1;
if (exists $options->{lazy} && $options->{lazy}) {
(exists $options->{default} || defined $options->{builder} )
- || confess "You cannot have lazy attribute without specifying a default value for it";
+ || confess "You cannot have lazy attribute ($name) without specifying a default value for it";
}
if ( $options->{required} && !( ( !exists $options->{init_arg} || defined $options->{init_arg} ) || exists $options->{default} || defined $options->{builder} ) ) {
- confess "You cannot have a required attribute without a default, builder, or an init_arg";
+ confess "You cannot have a required attribute ($name) without a default, builder, or an init_arg";
}
}
## Slot management
+# FIXME:
+# this duplicates too much code from
+# Class::MOP::Attribute, we need to
+# refactor these bits eventually.
+# - SL
+sub _set_initial_slot_value {
+ my ($self, $meta_instance, $instance, $value) = @_;
+
+ my $slot_name = $self->name;
+
+ return $meta_instance->set_slot_value($instance, $slot_name, $value)
+ unless $self->has_initializer;
+
+ my ($type_constraint, $can_coerce);
+ if ($self->has_type_constraint) {
+ $type_constraint = $self->type_constraint;
+ $can_coerce = ($self->should_coerce && $type_constraint->has_coercion);
+ }
+
+ my $callback = sub {
+ my $val = shift;
+ if ($type_constraint) {
+ $val = $type_constraint->coerce($val)
+ if $can_coerce;
+ $type_constraint->check($val)
+ || confess "Attribute ("
+ . $slot_name
+ . ") does not pass the type constraint because: "
+ . $type_constraint->get_message($val);
+ }
+ $meta_instance->set_slot_value($instance, $slot_name, $val);
+ };
+
+ my $initializer = $self->initializer;
+
+ # most things will just want to set a value, so make it first arg
+ $instance->$initializer($value, $callback, $self);
+}
+
sub set_value {
my ($self, $instance, $value) = @_;
$associated_class->add_method($handle => subname $name, $method_to_call);
}
else {
+ # NOTE:
+ # we used to do a goto here, but the
+ # goto didn't handle failure correctly
+ # (it just returned nothing), so I took
+ # that out. However, the more I thought
+ # about it, the less I liked it doing
+ # the goto, and I prefered the act of
+ # delegation being actually represented
+ # in the stack trace.
+ # - SL
$associated_class->add_method($handle => subname $name, sub {
my $proxy = (shift)->$accessor();
- @_ = ($proxy, @_);
(defined $proxy)
|| confess "Cannot delegate $handle to $method_to_call because " .
"the value of " . $self->name . " is not defined";
- goto &{ $proxy->can($method_to_call) || return };
+ $proxy->$method_to_call(@_);
});
}
}
=item B<new>
+=item B<does>
+
=item B<initialize_instance_slot>
=item B<install_accessors>
=over 4
+=item B<interpolate_class_and_new>
+
+=item B<interpolate_class>
+
+When called as a class method causes interpretation of the C<metaclass> and
+C<traits> options.
+
=item B<clone_and_inherit_options>
This is to support the C<has '+foo'> feature, it clones an attribute
Returns true if this meta-attribute has any documentation.
+=item B<applied_traits>
+
+This will return the ARRAY ref of all the traits applied to this
+attribute, or if no traits have been applied, it returns C<undef>.
+
+=item B<has_applied_traits>
+
+Returns true if this meta-attribute has any traits applied.
+
=back
=head1 BUGS
projects / gitmo/Moose.git / blobdiff