7 use Scalar::Util 'blessed';
10 our $VERSION = '0.73';
11 $VERSION = eval $VERSION;
12 our $AUTHORITY = 'cpan:STEVAN';
20 get_all_attribute_values
21 resolve_metatrait_alias
22 resolve_metaclass_alias
27 Sub::Exporter::setup_exporter({
29 groups => { all => \@exports }
32 ## some utils for the utils ...
36 return Class::MOP::get_metaclass_by_name(blessed($_[0]) || $_[0]);
42 my ($class_or_obj, $role) = @_;
44 my $meta = find_meta($class_or_obj);
46 return unless defined $meta;
47 return unless $meta->can('does_role');
48 return 1 if $meta->does_role($role);
52 sub search_class_by_role {
53 my ($class_or_obj, $role_name) = @_;
55 my $meta = find_meta($class_or_obj);
57 return unless defined $meta;
59 foreach my $class ($meta->class_precedence_list) {
61 my $_meta = find_meta($class);
63 next unless defined $_meta;
65 foreach my $role (@{ $_meta->roles || [] }) {
66 return $class if $role->name eq $role_name;
74 my $applicant = shift;
78 Moose->throw_error("Must specify at least one role to apply to $applicant");
81 my $roles = Data::OptList::mkopt( [@_] );
83 my $meta = ( blessed $applicant ? $applicant : find_meta($applicant) );
85 foreach my $role_spec (@$roles) {
86 Class::MOP::load_class( $role_spec->[0] );
89 foreach my $role (@$roles) {
90 unless (Class::MOP::class_of($role->[0])->isa('Moose::Meta::Role') ) {
93 Moose->throw_error( "You can only consume roles, "
95 . " is not a Moose role" );
99 if ( scalar @$roles == 1 ) {
100 my ( $role, $params ) = @{ $roles->[0] };
101 $role->meta->apply( $meta, ( defined $params ? %$params : () ) );
104 Moose::Meta::Role->combine( @$roles )->apply($meta);
108 # instance deconstruction ...
110 sub get_all_attribute_values {
111 my ($class, $instance) = @_;
113 map { $_->name => $_->get_value($instance) }
114 grep { $_->has_value($instance) }
115 $class->compute_all_applicable_attributes
119 sub get_all_init_args {
120 my ($class, $instance) = @_;
122 map { $_->init_arg => $_->get_value($instance) }
123 grep { $_->has_value($instance) }
124 grep { defined($_->init_arg) }
125 $class->compute_all_applicable_attributes
129 sub resolve_metatrait_alias {
130 return resolve_metaclass_alias( @_, trait => 1 );
136 sub resolve_metaclass_alias {
137 my ( $type, $metaclass_name, %options ) = @_;
139 my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' );
140 return $cache{$cache_key}{$metaclass_name}
141 if $cache{$cache_key}{$metaclass_name};
143 my $possible_full_name
147 . ( $options{trait} ? "Trait::" : "" )
150 my $loaded_class = Class::MOP::load_first_existing_class(
155 return $cache{$cache_key}{$metaclass_name}
156 = $loaded_class->can('register_implementation')
157 ? $loaded_class->register_implementation
162 sub add_method_modifier {
163 my ( $class_or_obj, $modifier_name, $args ) = @_;
164 my $meta = find_meta($class_or_obj);
165 my $code = pop @{$args};
166 my $add_modifier_method = 'add_' . $modifier_name . '_method_modifier';
167 if ( my $method_modifier_type = ref( @{$args}[0] ) ) {
168 if ( $method_modifier_type eq 'Regexp' ) {
169 my @all_methods = $meta->get_all_methods;
171 = grep { $_->name =~ @{$args}[0] } @all_methods;
172 $meta->$add_modifier_method( $_->name, $code )
173 for @matched_methods;
177 $meta->$add_modifier_method( $_, $code ) for @{$args};
184 return $items[0] if @items == 1;
185 return "$items[0] and $items[1]" if @items == 2;
187 my $tail = pop @items;
188 my $list = join ', ', @items;
189 $list .= ', and ' . $tail;
202 Moose::Util - Utilities for working with Moose classes
206 use Moose::Util qw/find_meta does_role search_class_by_role/;
208 my $meta = find_meta($object) || die "No metaclass found";
210 if (does_role($object, $role)) {
211 print "The object can do $role!\n";
214 my $class = search_class_by_role($object, 'FooRole');
215 print "Nearest class with 'FooRole' is $class\n";
219 This module provides a set of utility functions. Many of these
220 functions are intended for use in Moose itself or MooseX modules, but
221 some of them may be useful for use in your own code.
223 =head1 EXPORTED FUNCTIONS
227 =item B<find_meta($class_or_obj)>
229 This method takes a class name or object and attempts to find a
230 metaclass for the class, if one exists. It will not create one if it
233 =item B<does_role($class_or_obj, $role_name)>
235 Returns true if C<$class_or_obj> does the given C<$role_name>.
237 The class must already have a metaclass for this to work.
239 =item B<search_class_by_role($class_or_obj, $role_name)>
241 Returns the first class in the class's precedence list that does
242 C<$role_name>, if any.
244 The class must already have a metaclass for this to work.
246 =item B<apply_all_roles($applicant, @roles)>
248 This function applies one or more roles to the given C<$applicant> The
249 applicant can be a role name, class name, or object.
251 The C<$applicant> must already have a metaclass object.
253 The list of C<@roles> should be a list of names, each of which can be
254 followed by an optional hash reference of options (C<exclude> and
257 =item B<get_all_attribute_values($meta, $instance)>
259 Returns a hash reference containing all of the C<$instance>'s
260 attributes. The keys are attribute names.
262 =item B<get_all_init_args($meta, $instance)>
264 Returns a hash reference containing all of the C<init_arg> values for
265 the instance's attributes. The values are the associated attribute
266 values. If an attribute does not have a defined C<init_arg>, it is
269 This could be useful in cloning an object.
271 =item B<resolve_metaclass_alias($category, $name, %options)>
273 =item B<resolve_metatrait_alias($category, $name, %options)>
275 Resolves a short name to a full class name. Short names are often used
276 when specifying the C<metaclass> or C<traits> option for an attribute:
282 The name resolution mechanism is covered in L<Moose/Trait Name
285 =item B<english_list(@items)>
287 Given a list of scalars, turns them into a proper list in English
288 ("one and two", "one, two, three, and four"). This is used to help us
289 make nicer error messages.
295 Here is a list of possible functions to write
299 =item discovering original method from modified method
301 =item search for origin class of a method or attribute
307 All complex software has bugs lurking in it, and this module is no
308 exception. If you find a bug please either email me, or add the bug
313 Anders Nor Berle E<lt>debolaz@gmail.comE<gt>
315 B<with contributions from:>
317 Robert (phaylon) Sedlacek
321 =head1 COPYRIGHT AND LICENSE
323 Copyright 2007-2009 by Infinity Interactive, Inc.
325 L<http://www.iinteractive.com>
327 This library is free software; you can redistribute it and/or modify
328 it under the same terms as Perl itself.