package Role::Tiny;
sub _getglob { \*{$_[0]} }
+sub _getstash { \%{"$_[0]::"} }
use strict;
use warnings FATAL => 'all';
+our $VERSION = '1.000000'; # 1.0.0
+$VERSION = eval $VERSION;
+
our %INFO;
our %APPLIED_TO;
our %COMPOSED;
+# Module state workaround totally stolen from Zefram's Module::Runtime.
+
+BEGIN {
+ *_WORK_AROUND_BROKEN_MODULE_STATE = "$]" < 5.009 ? sub(){1} : sub(){0};
+}
+
+sub Role::Tiny::__GUARD__::DESTROY {
+ delete $INC{$_[0]->[0]} if @{$_[0]};
+}
+
sub _load_module {
- return 1 if $_[0]->can('can');
(my $proto = $_[0]) =~ s/::/\//g;
- require "${proto}.pm";
+ $proto .= '.pm';
+ return 1 if $INC{$proto};
+ # 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])||{}};
+ my $guard = _WORK_AROUND_BROKEN_MODULE_STATE
+ && bless([ $proto ], 'Role::Tiny::__GUARD__');
+ require $proto;
+ pop @$guard if _WORK_AROUND_BROKEN_MODULE_STATE;
return 1;
}
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
};
*{_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 ($] > 5.010) {
+ if ($] >= 5.010) {
require mro;
} else {
require MRO::Compat;
) {
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;
-=pod
+=head1 NAME
+
+Role::Tiny - Roles. Like a nouvelle cusine portion size slice of Moose.
=head1 SYNOPSIS
package Some::Class;
- require Role::Tiny;
+ use Role::Tiny::With;
# bar gets imported, but not foo
- Role::Tiny->apply_role_to_package('Some::Role', __PACKAGE__);
+ with 'Some::Role';
sub foo { ... }
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
=head2 apply_role_to_package
- Role::Tiny->apply_role_to_package('Some::Role', 'Some::Package');
+ Role::Tiny->apply_role_to_package('Some::Package', 'Some::Role');
-Composes role with package
+Composes role with package. See also L<Role::Tiny::With>.
=head2 apply_roles_to_object
See L<< Class::Method::Modifiers/after method(s) => sub { ... } >> for full
documentation.
+=head1 AUTHOR
+
+mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>
+
+=head1 CONTRIBUTORS
+
+dg - David Leadbeater (cpan:DGL) <dgl@dgl.cx>
+
+frew - Arthur Axel "fREW" Schmidt (cpan:FREW) <frioux@gmail.com>
+
+hobbs - Andrew Rodland (cpan:ARODLAND) <arodland@cpan.org>
+
+jnap - John Napiorkowski (cpan:JJNAPIORK) <jjn1056@yahoo.com>
+
+ribasushi - Peter Rabbitson (cpan:RIBASUSHI) <ribasushi@cpan.org>
+
+chip - Chip Salzenberg (cpan:CHIPS) <chip@pobox.com>
+
+ajgb - Alex J. G. Burzyński (cpan:AJGB) <ajgb@cpan.org>
+
+doy - Jesse Luehrs (cpan:DOY) <doy at tozt dot net>
+
+perigrin - Chris Prather (cpan:PERIGRIN) <chris@prather.org>
+
+=head1 COPYRIGHT
+
+Copyright (c) 2010-2012 the Role::Tiny L</AUTHOR> and L</CONTRIBUTORS>
+as listed above.
+
+=head1 LICENSE
+
+This library is free software and may be distributed under the same terms
+as perl itself.
+
+=cut
projects / gitmo/Role-Tiny.git / blobdiff