X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FRole%2FTiny.pm;h=8ddc074a458e6e1f5c17196e948377914c6cd2f9;hb=385f50873b724645e2fea1da9d53baea5f6d782c;hp=93d2a7fe7005c7520118b47f369ed9b7e94324da;hpb=5febcf4da59801cd25facc5f576eadf924b7a4fc;p=gitmo%2FRole-Tiny.git diff --git a/lib/Role/Tiny.pm b/lib/Role/Tiny.pm index 93d2a7f..8ddc074 100644 --- a/lib/Role/Tiny.pm +++ b/lib/Role/Tiny.pm @@ -1,25 +1,47 @@ 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]; - strictures->import; + my $me = shift; + strict->import; + warnings->import(FATAL => 'all'); return if $INFO{$target}; # already exported into this package # get symbol table reference my $stash = do { no strict 'refs'; \%{"${target}::"} }; @@ -35,21 +57,21 @@ sub import { }; *{_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); @@ -84,15 +106,18 @@ sub create_class_with_roles { 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 $role (@roles) { _load_module($role); - die "${role} is not a Role::Tiny" unless my $info = $INFO{$role}; + die "${role} is not a Role::Tiny" unless $INFO{$role}; } - if ($] > 5.010) { + if ($] >= 5.010) { require mro; } else { require MRO::Compat; @@ -102,7 +127,7 @@ sub create_class_with_roles { *{_getglob("${new_name}::ISA")} = [ @composable, $superclass ]; - my @info = map +($INFO{$_} ? $INFO{$_} : ()), @roles; + my @info = map $INFO{$_}, @roles; $me->_check_requires( $new_name, $compose_name, @@ -133,8 +158,13 @@ sub _composable_package_for { ) { 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 $@; + my $e; + { + local $@; + eval(my $code = join "\n", "package ${base_name};", @mod_base); + $e = "Evaling failed: $@\nTrying to eval:\n${code}" if $@; + } + die $e if $e; $me->_install_modifiers($composed_name, $modifiers); $COMPOSED{role}{$composed_name} = 1; return $composed_name; @@ -165,7 +195,7 @@ sub _concrete_methods_of { 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 %$stash }; }; } @@ -189,7 +219,7 @@ sub _install_methods { # determine already extant methods of target my %has_methods; @has_methods{grep - +((ref($stash->{$_}) eq 'SCALAR') || (*{$stash->{$_}}{CODE})), + +(ref($stash->{$_}) || *{$stash->{$_}}{CODE}), keys %$stash } = (); @@ -222,7 +252,9 @@ sub does_role { 1; -=pod +=head1 NAME + +Role::Tiny - Roles. Like a nouvelle cuisine portion size slice of Moose. =head1 SYNOPSIS @@ -240,10 +272,10 @@ else where 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 { ... } @@ -270,6 +302,8 @@ from the role. If a method that the role L to be implemented is not implemented, role application will fail loudly. +=back + Unlike L, where the B class inherited from "wins," role composition is the other way around, where first wins. In a more complete system (see L) roles are checked to see if they clash. The goal of this @@ -279,9 +313,9 @@ is to be much simpler, hence disallowing composition of multiple roles at once. =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. =head2 apply_roles_to_object @@ -297,16 +331,25 @@ resulting class. Creates a new class based on base, with the roles composed into it in order. New class is returned. -=head1 IMPORTED METHODS +=head1 SUBROUTINES =head2 does_role - if ($foo->does_role('Some::Role')) { + if (Role::Tiny::does_role($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('Some::Role')) { + ... + } + +will work for classes but to test a role, one must use ::does_role directly + =head1 IMPORTED SUBROUTINES =head2 requires @@ -344,3 +387,38 @@ documentation. See L<< Class::Method::Modifiers/after method(s) => sub { ... } >> for full documentation. +=head1 AUTHOR + +mst - Matt S. Trout (cpan:MSTROUT) + +=head1 CONTRIBUTORS + +dg - David Leadbeater (cpan:DGL) + +frew - Arthur Axel "fREW" Schmidt (cpan:FREW) + +hobbs - Andrew Rodland (cpan:ARODLAND) + +jnap - John Napiorkowski (cpan:JJNAPIORK) + +ribasushi - Peter Rabbitson (cpan:RIBASUSHI) + +chip - Chip Salzenberg (cpan:CHIPS) + +ajgb - Alex J. G. Burzyński (cpan:AJGB) + +doy - Jesse Luehrs (cpan:DOY) + +perigrin - Chris Prather (cpan:PERIGRIN) + +=head1 COPYRIGHT + +Copyright (c) 2010-2012 the Role::Tiny L and L +as listed above. + +=head1 LICENSE + +This library is free software and may be distributed under the same terms +as perl itself. + +=cut