package Role::Tiny;
sub _getglob { \*{$_[0]} }
+sub _getstash { \%{"$_[0]::"} }
use strict;
use warnings FATAL => 'all';
our %APPLIED_TO;
our %COMPOSED;
+# inlined from Moo::_Utils - update that first.
+
sub _load_module {
- return 1 if $_[0]->can('can');
(my $proto = $_[0]) =~ s/::/\//g;
- require "${proto}.pm";
+ return 1 if $INC{"${proto}.pm"};
+ # can't just ->can('can') because a sub-package Foo::Bar::Baz
+ # creates a 'Baz::' key in Foo::Bar's symbol table
+ return 1 if grep !/::$/, keys %{_getstash($_[0])||{}};
+ { local $@; require "${proto}.pm"; }
return 1;
}
+{ # \[] is REF, not SCALAR. \v1 is VSTRING (thanks to doy for that one)
+ my %reftypes = map +($_ => 1), qw(SCALAR REF VSTRING);
+ sub _is_scalar_ref { $reftypes{ref($_[0])} }
+}
+
sub import {
my $target = caller;
- my $me = $_[0];
+ my $me = shift;
strictures->import;
return if $INFO{$target}; # already exported into this package
# get symbol table reference
# install before/after/around subs
foreach my $type (qw(before after around)) {
*{_getglob "${target}::${type}"} = sub {
- require Class::Method::Modifiers;
+ { local $@; require Class::Method::Modifiers; }
push @{$INFO{$target}{modifiers}||=[]}, [ $type => @_ ];
};
}
};
*{_getglob "${target}::with"} = sub {
die "Only one role supported at a time by with" if @_ > 1;
- $me->apply_role_to_package($_[0], $target);
+ $me->apply_role_to_package($target, $_[0]);
};
- # grab all *non-constant* (ref eq 'SCALAR') subs present
+ # grab all *non-constant* (stash slot is not a scalarref) subs present
# in the symbol table and store their refaddrs (no need to forcibly
# inflate constant subs into real subs) - also add '' to here (this
# is used later)
@{$INFO{$target}{not_methods}={}}{
- '', map { *$_{CODE}||() } grep !(ref eq 'SCALAR'), values %$stash
+ '', map { *$_{CODE}||() } grep !ref($_), values %$stash
} = ();
# a role does itself
$APPLIED_TO{$target} = { $target => undef };
}
sub apply_role_to_package {
- my ($me, $role, $to) = @_;
+ my ($me, $to, $role) = @_;
_load_module($role);
die "No roles supplied!" unless @roles;
- my $new_name = join('+', $superclass, my $compose_name = join '+', @roles);
+ my $new_name = join(
+ '__WITH__', $superclass, my $compose_name = join '__AND__', @roles
+ );
+
return $new_name if $COMPOSED{class}{$new_name};
foreach my $role (@roles) {
die "${role} is not a Role::Tiny" unless my $info = $INFO{$role};
}
- if ($] > 5.010) {
- require mro;
+ if ($] >= 5.010) {
+ { local $@; require mro; }
} else {
- require MRO::Compat;
+ { local $@; require MRO::Compat; }
}
my @composable = map $me->_composable_package_for($_), reverse @roles;
) {
push @mod_base, "sub ${modified} { shift->next::method(\@_) }";
}
- eval(my $code = join "\n", "package ${base_name};", @mod_base);
- die "Evaling failed: $@\nTrying to eval:\n${code}" if $@;
+ {
+ local $@;
+ eval(my $code = join "\n", "package ${base_name};", @mod_base);
+ die "Evaling failed: $@\nTrying to eval:\n${code}" if $@;
+ }
$me->_install_modifiers($composed_name, $modifiers);
$COMPOSED{role}{$composed_name} = 1;
return $composed_name;
my $code = *{$stash->{$_}}{CODE};
# rely on the '' key we added in import for "no code here"
exists $not_methods->{$code||''} ? () : ($_ => $code)
- } grep !(ref($stash->{$_}) eq 'SCALAR'), keys %$stash
+ } grep !ref($stash->{$_}), keys %$stash
};
};
}
# determine already extant methods of target
my %has_methods;
@has_methods{grep
- +((ref($stash->{$_}) eq 'SCALAR') || (*{$stash->{$_}}{CODE})),
+ +(ref($stash->{$_}) || *{$stash->{$_}}{CODE}),
keys %$stash
} = ();
}
1;
+
+=head1 NAME
+
+Role::Tiny - Roles. Like a nouvelle cusine portion size slice of Moose.
+
+=head1 SYNOPSIS
+
+ package Some::Role;
+
+ use Role::Tiny;
+
+ sub foo { ... }
+
+ sub bar { ... }
+
+ 1;
+
+else where
+
+ package Some::Class;
+
+ use Role::Tiny::With;
+
+ # bar gets imported, but not foo
+ with 'Some::Role';
+
+ sub foo { ... }
+
+ 1;
+
+=head1 DESCRIPTION
+
+C<Role::Tiny> is a minimalist role composition tool.
+
+=head1 ROLE COMPOSITION
+
+Role composition can be thought of as much more clever and meaningful multiple
+inheritance. The basics of this implementation of roles is:
+
+=over 2
+
+=item *
+
+If a method is already defined on a class, that method will not be composed in
+from the role.
+
+=item *
+
+If a method that the role L</requires> to be implemented is not implemented,
+role application will fail loudly.
+
+=back
+
+Unlike L<Class::C3>, where the B<last> class inherited from "wins," role
+composition is the other way around, where first wins. In a more complete
+system (see L<Moose>) roles are checked to see if they clash. The goal of this
+is to be much simpler, hence disallowing composition of multiple roles at once.
+
+=head1 METHODS
+
+=head2 apply_role_to_package
+
+ Role::Tiny->apply_role_to_package('Some::Package', 'Some::Role');
+
+Composes role with package. See also L<Role::Tiny::With>.
+
+=head2 apply_roles_to_object
+
+ Role::Tiny->apply_roles_to_object($foo, qw(Some::Role1 Some::Role2));
+
+Composes roles in order into object directly. Object is reblessed into the
+resulting class.
+
+=head2 create_class_with_roles
+
+ Role::Tiny->create_class_with_roles('Some::Base', qw(Some::Role1 Some::Role2));
+
+Creates a new class based on base, with the roles composed into it in order.
+New class is returned.
+
+=head1 SUBROUTINES
+
+=head2 does_role
+
+ if (Role::Tiny::does_role($foo, 'Some::Role')) {
+ ...
+ }
+
+Returns true if class has been composed with role.
+
+This subroutine is also installed as ->does on any class a Role::Tiny is
+composed into unless that class already has an ->does method, so
+
+ if ($foo->does_role('Some::Role')) {
+ ...
+ }
+
+will work for classes but to test a role, one must use ::does_role directly
+
+=head1 IMPORTED SUBROUTINES
+
+=head2 requires
+
+ requires qw(foo bar);
+
+Declares a list of methods that must be defined to compose role.
+
+=head2 with
+
+ with 'Some::Role1';
+ with 'Some::Role2';
+
+Composes another role into the current role. Only one role may be composed in
+at a time to allow the code to remain as simple as possible.
+
+=head2 before
+
+ before foo => sub { ... };
+
+See L<< Class::Method::Modifiers/before method(s) => sub { ... } >> for full
+documentation.
+
+=head2 around
+
+ around foo => sub { ... };
+
+See L<< Class::Method::Modifiers/around method(s) => sub { ... } >> for full
+documentation.
+
+=head2 after
+
+ after foo => sub { ... };
+
+See L<< Class::Method::Modifiers/after method(s) => sub { ... } >> for full
+documentation.
+
+=head1 AUTHORS
+
+See L<Moo> for authors.
+
+=head1 COPYRIGHT AND LICENSE
+
+See L<Moo> for the copyright and license.
+
+=cut
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