use strict;
use warnings;
+use Data::OptList;
use Sub::Exporter;
use Scalar::Util 'blessed';
use Class::MOP 0.60;
-our $VERSION = '0.62_01';
+our $VERSION = '0.93_03';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
my @exports = qw[
- find_meta
+ find_meta
does_role
- search_class_by_role
+ search_class_by_role
+ ensure_all_roles
apply_all_roles
get_all_init_args
get_all_attribute_values
resolve_metatrait_alias
resolve_metaclass_alias
add_method_modifier
+ english_list
+ meta_attribute_alias
+ meta_class_alias
];
Sub::Exporter::setup_exporter({
## some utils for the utils ...
-sub find_meta {
- return unless $_[0];
- return Class::MOP::get_metaclass_by_name(blessed($_[0]) || $_[0]);
-}
+sub find_meta { Class::MOP::class_of(@_) }
## the functions ...
my ($class_or_obj, $role) = @_;
my $meta = find_meta($class_or_obj);
-
+
return unless defined $meta;
return unless $meta->can('does_role');
return 1 if $meta->does_role($role);
sub search_class_by_role {
my ($class_or_obj, $role_name) = @_;
-
+
my $meta = find_meta($class_or_obj);
return unless defined $meta;
foreach my $class ($meta->class_precedence_list) {
-
- my $_meta = find_meta($class);
+
+ my $_meta = find_meta($class);
next unless defined $_meta;
return;
}
+# this can possibly behave in unexpected ways because the roles being composed
+# before being applied could differ from call to call; I'm not sure if or how
+# to document this possible quirk.
+sub ensure_all_roles {
+ my $applicant = shift;
+ _apply_all_roles($applicant, sub { !does_role($applicant, $_) }, @_);
+}
+
sub apply_all_roles {
my $applicant = shift;
+ _apply_all_roles($applicant, undef, @_);
+}
+
+sub _apply_all_roles {
+ my $applicant = shift;
+ my $role_filter = shift;
- Moose->throw_error("Must specify at least one role to apply to $applicant") unless @_;
+ unless (@_) {
+ require Moose;
+ Moose->throw_error("Must specify at least one role to apply to $applicant");
+ }
my $roles = Data::OptList::mkopt( [@_] );
- my $meta = ( blessed $applicant ? $applicant : find_meta($applicant) );
+ foreach my $role (@$roles) {
+ Class::MOP::load_class( $role->[0] );
+ my $meta = Class::MOP::class_of( $role->[0] );
- foreach my $role_spec (@$roles) {
- Class::MOP::load_class( $role_spec->[0] );
+ unless ($meta && $meta->isa('Moose::Meta::Role') ) {
+ require Moose;
+ Moose->throw_error( "You can only consume roles, "
+ . $role->[0]
+ . " is not a Moose role" );
+ }
+ }
+
+ if ( defined $role_filter ) {
+ @$roles = grep { local $_ = $_->[0]; $role_filter->() } @$roles;
}
- ( $_->[0]->can('meta') && $_->[0]->meta->isa('Moose::Meta::Role') )
- || Moose->throw_error("You can only consume roles, "
- . $_->[0]
- . " is not a Moose role")
- foreach @$roles;
+ return unless @$roles;
+
+ my $meta = ( blessed $applicant ? $applicant : find_meta($applicant) );
if ( scalar @$roles == 1 ) {
my ( $role, $params ) = @{ $roles->[0] };
- $role->meta->apply( $meta, ( defined $params ? %$params : () ) );
+ my $role_meta = Class::MOP::class_of($role);
+ $role_meta->apply( $meta, ( defined $params ? %$params : () ) );
}
else {
Moose::Meta::Role->combine( @$roles )->apply($meta);
return +{
map { $_->name => $_->get_value($instance) }
grep { $_->has_value($instance) }
- $class->compute_all_applicable_attributes
+ $class->get_all_attributes
};
}
return +{
map { $_->init_arg => $_->get_value($instance) }
grep { $_->has_value($instance) }
- grep { defined($_->init_arg) }
- $class->compute_all_applicable_attributes
+ grep { defined($_->init_arg) }
+ $class->get_all_attributes
};
}
return resolve_metaclass_alias( @_, trait => 1 );
}
+sub _build_alias_package_name {
+ my ($type, $name, $trait) = @_;
+ return 'Moose::Meta::'
+ . $type
+ . '::Custom::'
+ . ( $trait ? 'Trait::' : '' )
+ . $name;
+}
+
{
my %cache;
return $cache{$cache_key}{$metaclass_name}
if $cache{$cache_key}{$metaclass_name};
- my $possible_full_name
- = 'Moose::Meta::'
- . $type
- . '::Custom::'
- . ( $options{trait} ? "Trait::" : "" )
- . $metaclass_name;
+ my $possible_full_name = _build_alias_package_name(
+ $type, $metaclass_name, $options{trait}
+ );
my $loaded_class = Class::MOP::load_first_existing_class(
$possible_full_name,
sub add_method_modifier {
my ( $class_or_obj, $modifier_name, $args ) = @_;
- my $meta = find_meta($class_or_obj);
+ my $meta
+ = $class_or_obj->can('add_before_method_modifier')
+ ? $class_or_obj
+ : find_meta($class_or_obj);
my $code = pop @{$args};
my $add_modifier_method = 'add_' . $modifier_name . '_method_modifier';
if ( my $method_modifier_type = ref( @{$args}[0] ) ) {
}
}
+sub english_list {
+ my @items = sort @_;
+
+ return $items[0] if @items == 1;
+ return "$items[0] and $items[1]" if @items == 2;
+
+ my $tail = pop @items;
+ my $list = join ', ', @items;
+ $list .= ', and ' . $tail;
+
+ return $list;
+}
+
+sub _caller_info {
+ my $level = @_ ? ($_[0] + 1) : 2;
+ my %info;
+ @info{qw(package file line)} = caller($level);
+ return \%info;
+}
+
+sub _create_alias {
+ my ($type, $name, $trait, $for) = @_;
+ my $package = _build_alias_package_name($type, $name, $trait);
+ Class::MOP::Class->initialize($package)->add_method(
+ register_implementation => sub { $for }
+ );
+}
+
+sub meta_attribute_alias {
+ my ($to, $from) = @_;
+ $from ||= caller;
+ my $meta = Class::MOP::class_of($from);
+ my $trait = $meta->isa('Moose::Meta::Role');
+ _create_alias('Attribute', $to, $trait, $from);
+}
+
+sub meta_class_alias {
+ my ($to, $from) = @_;
+ $from ||= caller;
+ my $meta = Class::MOP::class_of($from);
+ my $trait = $meta->isa('Moose::Meta::Role');
+ _create_alias('Class', $to, $trait, $from);
+}
+
1;
__END__
=head1 DESCRIPTION
-This is a set of utility functions to help working with Moose classes, and
-is used internally by Moose itself. The goal is to provide useful functions
-that for both Moose users and Moose extenders (MooseX:: authors).
-
-This is a relatively new addition to the Moose toolchest, so ideas,
-suggestions and contributions to this collection are most welcome.
-See the L<TODO> section below for a list of ideas for possible functions
-to write.
+This module provides a set of utility functions. Many of these
+functions are intended for use in Moose itself or MooseX modules, but
+some of them may be useful for use in your own code.
=head1 EXPORTED FUNCTIONS
=over 4
-=item B<find_meta ($class_or_obj)>
+=item B<find_meta($class_or_obj)>
-This will attempt to locate a metaclass for the given C<$class_or_obj>
-and return it.
+This method takes a class name or object and attempts to find a
+metaclass for the class, if one exists. It will B<not> create one if it
+does not yet exist.
-=item B<does_role ($class_or_obj, $role_name)>
+=item B<does_role($class_or_obj, $role_name)>
-Returns true if C<$class_or_obj> can do the role C<$role_name>.
+Returns true if C<$class_or_obj> does the given C<$role_name>.
-=item B<search_class_by_role ($class_or_obj, $role_name)>
+The class must already have a metaclass for this to work.
-Returns first class in precedence list that consumed C<$role_name>.
+=item B<search_class_by_role($class_or_obj, $role_name)>
-=item B<apply_all_roles ($applicant, @roles)>
+Returns the first class in the class's precedence list that does
+C<$role_name>, if any.
-Given an C<$applicant> (which can somehow be turned into either a
-metaclass or a metarole) and a list of C<@roles> this will do the
-right thing to apply the C<@roles> to the C<$applicant>. This is
-actually used internally by both L<Moose> and L<Moose::Role>, and the
-C<@roles> will be pre-processed through L<Data::OptList::mkopt>
-to allow for the additional arguments to be passed.
+The class must already have a metaclass for this to work.
+
+=item B<apply_all_roles($applicant, @roles)>
+
+This function applies one or more roles to the given C<$applicant> The
+applicant can be a role name, class name, or object.
+
+The C<$applicant> must already have a metaclass object.
+
+The list of C<@roles> should be a list of names, each of which can be
+followed by an optional hash reference of options (C<-excludes> and
+C<-alias>).
+
+=item B<ensure_all_roles($applicant, @roles)>
+
+This function is similar to L</apply_all_roles>, but only applies roles that
+C<$applicant> does not already consume.
=item B<get_all_attribute_values($meta, $instance)>
-Returns the values of the C<$instance>'s fields keyed by the attribute names.
+Returns a hash reference containing all of the C<$instance>'s
+attributes. The keys are attribute names.
=item B<get_all_init_args($meta, $instance)>
-Returns a hash reference where the keys are all the attributes' C<init_arg>s
-and the values are the instance's fields. Attributes without an C<init_arg>
-will be skipped.
+Returns a hash reference containing all of the C<init_arg> values for
+the instance's attributes. The values are the associated attribute
+values. If an attribute does not have a defined C<init_arg>, it is
+skipped.
+
+This could be useful in cloning an object.
=item B<resolve_metaclass_alias($category, $name, %options)>
=item B<resolve_metatrait_alias($category, $name, %options)>
-Resolve a short name like in e.g.
+Resolves a short name to a full class name. Short names are often used
+when specifying the C<metaclass> or C<traits> option for an attribute:
has foo => (
metaclass => "Bar",
);
-to a full class name.
+The name resolution mechanism is covered in
+L<Moose/Metaclass and Trait Name Resolution>.
+
+=item B<english_list(@items)>
+
+Given a list of scalars, turns them into a proper list in English
+("one and two", "one, two, three, and four"). This is used to help us
+make nicer error messages.
+
+=item B<meta_class_alias($to[, $from])>
+
+=item B<meta_attribute_alias($to[, $from])>
-=item B<add_method_modifier ($class_or_obj, $modifier_name, $args)>
+Create an alias from the class C<$from> (or the current package, if
+C<$from> is unspecified), so that
+L<Moose/Metaclass and Trait Name Resolution> works properly.
=back
=head1 BUGS
-All complex software has bugs lurking in it, and this module is no
-exception. If you find a bug please either email me, or add the bug
-to cpan-RT.
+See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
=head1 COPYRIGHT AND LICENSE
-Copyright 2007-2008 by Infinity Interactive, Inc.
+Copyright 2007-2009 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
-it under the same terms as Perl itself.
+it under the same terms as Perl itself.
=cut
projects / gitmo/Moose.git / blobdiff