7 use Scalar::Util 'blessed';
11 our $VERSION = '0.04';
12 our $AUTHORITY = 'cpan:STEVAN';
20 get_all_attribute_values
23 Sub::Exporter::setup_exporter({
25 groups => { all => \@exports }
28 ## some utils for the utils ...
32 return Class::MOP::get_metaclass_by_name(blessed($_[0]) || $_[0]);
38 my ($class_or_obj, $role) = @_;
40 my $meta = find_meta($class_or_obj);
42 return unless defined $meta;
44 return 1 if $meta->does_role($role);
48 sub search_class_by_role {
49 my ($class_or_obj, $role_name) = @_;
51 my $meta = find_meta($class_or_obj);
53 return unless defined $meta;
55 foreach my $class ($meta->class_precedence_list) {
57 my $_meta = find_meta($class);
59 next unless defined $_meta;
61 foreach my $role (@{ $_meta->roles || [] }) {
62 return $class if $role->name eq $role_name;
70 my $applicant = shift;
72 confess "Must specify at least one role to apply to $applicant" unless @_;
74 my $roles = Data::OptList::mkopt([ @_ ]);
79 my $meta = (blessed $applicant ? $applicant : find_meta($applicant));
81 foreach my $role_spec (@$roles) {
82 Class::MOP::load_class($role_spec->[0]);
85 ($_->[0]->can('meta') && $_->[0]->meta->isa('Moose::Meta::Role'))
86 || confess "You can only consume roles, " . $_->[0] . " is not a Moose role"
89 if (scalar @$roles == 1) {
90 my ($role, $params) = @{$roles->[0]};
91 $role->meta->apply($meta, (defined $params ? %$params : ()));
94 Moose::Meta::Role->combine(
100 # instance deconstruction ...
102 sub get_all_attribute_values {
103 my ($class, $instance) = @_;
105 map { $_->name => $_->get_value($instance) }
106 grep { $_->has_value($instance) }
107 $class->compute_all_applicable_attributes
111 sub get_all_init_args {
112 my ($class, $instance) = @_;
114 map { $_->init_arg => $_->get_value($instance) }
115 grep { $_->has_value($instance) }
116 grep { defined($_->init_arg) }
117 $class->compute_all_applicable_attributes
121 sub resolve_metatrait_alias {
122 resolve_metaclass_alias( @_, trait => 1 );
125 sub resolve_metaclass_alias {
126 my ( $type, $metaclass_name, %options ) = @_;
128 if ( my $resolved = eval {
129 my $possible_full_name = 'Moose::Meta::' . $type . '::Custom::' . ( $options{trait} ? "Trait::" : "" ) . $metaclass_name;
131 Class::MOP::load_class($possible_full_name);
133 $possible_full_name->can('register_implementation')
134 ? $possible_full_name->register_implementation
135 : $possible_full_name;
139 Class::MOP::load_class($metaclass_name);
140 return $metaclass_name;
153 Moose::Util - Utilities for working with Moose classes
157 use Moose::Util qw/find_meta does_role search_class_by_role/;
159 my $meta = find_meta($object) || die "No metaclass found";
161 if (does_role($object, $role)) {
162 print "The object can do $role!\n";
165 my $class = search_class_by_role($object, 'FooRole');
166 print "Nearest class with 'FooRole' is $class\n";
170 This is a set of utility functions to help working with Moose classes, and
171 is used internally by Moose itself. The goal is to provide useful functions
172 that for both Moose users and Moose extenders (MooseX:: authors).
174 This is a relatively new addition to the Moose toolchest, so ideas,
175 suggestions and contributions to this collection are most welcome.
176 See the L<TODO> section below for a list of ideas for possible functions
179 =head1 EXPORTED FUNCTIONS
183 =item B<find_meta ($class_or_obj)>
185 This will attempt to locate a metaclass for the given C<$class_or_obj>
188 =item B<does_role ($class_or_obj, $role_name)>
190 Returns true if C<$class_or_obj> can do the role C<$role_name>.
192 =item B<search_class_by_role ($class_or_obj, $role_name)>
194 Returns first class in precedence list that consumed C<$role_name>.
196 =item B<apply_all_roles ($applicant, @roles)>
198 Given an C<$applicant> (which can somehow be turned into either a
199 metaclass or a metarole) and a list of C<@roles> this will do the
200 right thing to apply the C<@roles> to the C<$applicant>. This is
201 actually used internally by both L<Moose> and L<Moose::Role>, and the
202 C<@roles> will be pre-processed through L<Data::OptList::mkopt>
203 to allow for the additional arguments to be passed.
205 =item B<get_all_attribute_values($meta, $instance)>
207 Returns the values of the C<$instance>'s fields keyed by the attribute names.
209 =item B<get_all_init_args($meta, $instance)>
211 Returns a hash reference where the keys are all the attributes' C<init_arg>s
212 and the values are the instance's fields. Attributes without an C<init_arg>
215 =item B<resolve_metaclass_alias($category, $name, %options)>
217 =item B<resolve_metatrait_alias($category, $name, %options)>
219 Resolve a short name like in e.g.
225 to a full class name.
231 Here is a list of possible functions to write
235 =item discovering original method from modified method
237 =item search for origin class of a method or attribute
243 All complex software has bugs lurking in it, and this module is no
244 exception. If you find a bug please either email me, or add the bug
249 Anders Nor Berle E<lt>debolaz@gmail.comE<gt>
251 B<with contributions from:>
253 Robert (phaylon) Sedlacek
257 =head1 COPYRIGHT AND LICENSE
259 Copyright 2007-2008 by Infinity Interactive, Inc.
261 L<http://www.iinteractive.com>
263 This library is free software; you can redistribute it and/or modify
264 it under the same terms as Perl itself.