use Scalar::Util directly

[gitmo/Mouse.git] / lib / Mouse / Role.pm

diff --git a/lib/Mouse/Role.pm b/lib/Mouse/Role.pm
index 3392f3e..37007e5 100644 (file)
--- a/lib/Mouse/Role.pm
+++ b/lib/Mouse/Role.pm
@@ -2,50 +2,146 @@
 package Mouse::Role;
 use strict;
 use warnings;
+use base 'Exporter';
 
-use Sub::Exporter;
 use Carp 'confess';
+use Scalar::Util 'blessed';
 
-do {
-    my $CALLER;
-
-    my %exports = (
-        extends => sub {
-            return sub {
-                confess "Role does not currently support 'extends'";
-            }
-        },
-        before => sub {
-            return sub { }
-        },
-        after => sub {
-            return sub { }
-        },
-        around => sub {
-            return sub { }
-        },
-        has => sub {
-            return sub { }
-        },
-    );
-
-    my $exporter = Sub::Exporter::build_exporter({
-        exports => \%exports,
-        groups  => { default => [':all'] },
-    });
-
-    sub import {
-        $CALLER = caller;
-
-        strict->import;
-        warnings->import;
-
-        goto $exporter;
+use Mouse::Meta::Role;
+
+our @EXPORT = qw(before after around has extends with requires excludes confess blessed);
+
+sub before {
+    my $meta = Mouse::Meta::Role->initialize(caller);
+
+    my $code = pop;
+    for (@_) {
+        $meta->add_before_method_modifier($_ => $code);
+    }
+}
+
+sub after {
+    my $meta = Mouse::Meta::Role->initialize(caller);
+
+    my $code = pop;
+    for (@_) {
+        $meta->add_after_method_modifier($_ => $code);
     }
+}
 
-    sub unimport {
+sub around {
+    my $meta = Mouse::Meta::Role->initialize(caller);
+
+    my $code = pop;
+    for (@_) {
+        $meta->add_around_method_modifier($_ => $code);
     }
-};
+}
+
+sub has {
+    my $meta = Mouse::Meta::Role->initialize(caller);
+
+    my $name = shift;
+    my %opts = @_;
+
+    $meta->add_attribute($name => \%opts);
+}
+
+sub extends  { confess "Roles do not support 'extends'" }
+
+sub with     {
+    my $meta = Mouse::Meta::Role->initialize(caller);
+    my $role  = shift;
+    my $args  = shift || {};
+    confess "Mouse::Role only supports 'with' on individual roles at a time" if @_ || !ref $args;
+
+    Mouse::load_class($role);
+    $role->meta->apply($meta, %$args);
+}
+
+sub requires {
+    my $meta = Mouse::Meta::Role->initialize(caller);
+    Carp::croak "Must specify at least one method" unless @_;
+    $meta->add_required_methods(@_);
+}
+
+sub excludes { confess "Mouse::Role does not currently support 'excludes'" }
+
+sub import {
+    strict->import;
+    warnings->import;
+
+    my $caller = caller;
+    my $meta = Mouse::Meta::Role->initialize(caller);
+
+    no strict 'refs';
+    no warnings 'redefine';
+    *{$caller.'::meta'} = sub { $meta };
+
+    Mouse::Role->export_to_level(1, @_);
+}
+
+sub unimport {
+    my $caller = caller;
+
+    no strict 'refs';
+    for my $keyword (@EXPORT) {
+        delete ${ $caller . '::' }{$keyword};
+    }
+}
 
 1;
 
+__END__
+
+=head1 NAME
+
+Mouse::Role
+
+=head1 KEYWORDS
+
+=head2 meta -> Mouse::Meta::Role
+
+Returns this role's metaclass instance.
+
+=head2 before (method|methods) => Code
+
+Sets up a "before" method modifier. See L<Moose/before> or
+L<Class::Method::Modifiers/before>.
+
+=head2 after (method|methods) => Code
+
+Sets up an "after" method modifier. See L<Moose/after> or
+L<Class::Method::Modifiers/after>.
+
+=head2 around (method|methods) => Code
+
+Sets up an "around" method modifier. See L<Moose/around> or
+L<Class::Method::Modifiers/around>.
+
+=head2 has (name|names) => parameters
+
+Sets up an attribute (or if passed an arrayref of names, multiple attributes) to
+this role. See L<Mouse/has>.
+
+=head2 confess error -> BOOM
+
+L<Carp/confess> for your convenience.
+
+=head2 blessed value -> ClassName | undef
+
+L<Scalar::Util/blessed> for your convenience.
+
+=head1 MISC
+
+=head2 import
+
+Importing Mouse::Role will give you sugar.
+
+=head2 unimport
+
+Please unimport Mouse (C<no Mouse::Role>) so that if someone calls one of the
+keywords (such as L</has>) it will break loudly instead breaking subtly.
+
+=cut
+