X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMouse.git;a=blobdiff_plain;f=lib%2FMouse%2FRole.pm;h=987239763cee603e176c84cb664ed77faebc79bd;hp=f5da880057290a877f1c35b22b10b6a41e6d205d;hb=6d28c5cf89bfd4c00e675e95aff6c31b61aeb805;hpb=8da998d9d52f4f1bed58f3b196cccbd725959c56

diff --git a/lib/Mouse/Role.pm b/lib/Mouse/Role.pm
index f5da880..9872397 100644
--- a/lib/Mouse/Role.pm
+++ b/lib/Mouse/Role.pm
@@ -1,39 +1,223 @@
-#!/usr/bin/env perl
 package Mouse::Role;
 use strict;
 use warnings;
+use base 'Exporter';
 
-use Sub::Exporter;
 use Carp 'confess';
+use Scalar::Util 'blessed';
 
-do {
-    my $CALLER;
+use Mouse::Util qw(load_class not_supported);
+use Mouse ();
 
-    my %exports = (
-        extends => sub {
-            return sub {
-                confess "Mouse::Role does not currently support 'extends'";
-            }
-        },
-    );
+our @EXPORT = qw(before after around super override inner augment has extends with requires excludes confess blessed);
+our %is_removable = map{ $_ => undef } @EXPORT;
+delete $is_removable{confess};
+delete $is_removable{blessed};
 
-    my $exporter = Sub::Exporter::build_exporter({
-        exports => \%exports,
-        groups  => { default => [':all'] },
+sub before {
+    my $meta = Mouse::Meta::Role->initialize(scalar caller);
+
+    my $code = pop;
+    for (@_) {
+        $meta->add_before_method_modifier($_ => $code);
+    }
+}
+
+sub after {
+    my $meta = Mouse::Meta::Role->initialize(scalar caller);
+
+    my $code = pop;
+    for (@_) {
+        $meta->add_after_method_modifier($_ => $code);
+    }
+}
+
+sub around {
+    my $meta = Mouse::Meta::Role->initialize(scalar caller);
+
+    my $code = pop;
+    for (@_) {
+        $meta->add_around_method_modifier($_ => $code);
+    }
+}
+
+
+sub super {
+    return unless $Mouse::SUPER_BODY; 
+    $Mouse::SUPER_BODY->(@Mouse::SUPER_ARGS);
+}
+
+sub override {
+    my $classname = caller;
+    my $meta = Mouse::Meta::Role->initialize($classname);
+
+    my $name = shift;
+    my $code = shift;
+    my $fullname = "${classname}::${name}";
+
+    defined &$fullname
+        && $meta->throw_error("Cannot add an override of method '$fullname' "
+                            . "because there is a local version of '$fullname'");
+
+    $meta->add_override_method_modifier($name => sub {
+        local $Mouse::SUPER_PACKAGE = shift;
+        local $Mouse::SUPER_BODY = shift;
+        local @Mouse::SUPER_ARGS = @_;
+
+        $code->(@_);
     });
+}
+
+# We keep the same errors messages as Moose::Role emits, here.
+sub inner {
+    Carp::croak "Roles cannot support 'inner'";
+}
+
+sub augment {
+    Carp::croak "Roles cannot support 'augment'";
+}
 
-    sub import {
-        $CALLER = caller;
+sub has {
+    my $meta = Mouse::Meta::Role->initialize(scalar caller);
 
-        strict->import;
-        warnings->import;
+    my $name = shift;
+    my %opts = @_;
 
-        goto $exporter;
+    $meta->add_attribute($name => \%opts);
+}
+
+sub extends  {
+    Carp::croak "Roles do not support 'extends'"
+}
+
+sub with     {
+    my $meta = Mouse::Meta::Role->initialize(scalar caller);
+    Mouse::Util::apply_all_roles($meta->name, @_);
+}
+
+sub requires {
+    my $meta = Mouse::Meta::Role->initialize(scalar caller);
+    $meta->throw_error("Must specify at least one method") unless @_;
+    $meta->add_required_methods(@_);
+}
+
+sub excludes {
+    not_supported;
+}
+
+sub import {
+    my $class = shift;
+
+    strict->import;
+    warnings->import;
+
+    my $caller = caller;
+
+    # we should never export to main
+    if ($caller eq 'main') {
+        warn qq{$class does not export its sugar to the 'main' package.\n};
+        return;
     }
 
-    sub unimport {
+    Mouse::Meta::Role->initialize($caller)->add_method(meta => sub {
+        return Mouse::Meta::Role->initialize(ref($_[0]) || $_[0]);
+    });
+
+    Mouse::Role->export_to_level(1, @_);
+}
+
+sub unimport {
+    my $caller = caller;
+
+    my $stash = do{
+        no strict 'refs';
+        \%{$caller . '::'}
+    };
+
+    for my $keyword (@EXPORT) {
+        my $code;
+        if(exists $is_removable{$keyword}
+            && ($code = $caller->can($keyword))
+            && (Mouse::Util::get_code_info($code))[0] eq __PACKAGE__){
+
+            delete $stash->{$keyword};
+        }
     }
-};
+    return;
+}
 
 1;
 
+__END__
+
+=head1 NAME
+
+Mouse::Role - define a role in Mouse
+
+=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>.
+
+=over 4
+
+=item B<super>
+
+Sets up the "super" keyword. See L<Moose/super>.
+
+=item B<override ($name, &sub)>
+
+Sets up an "override" method modifier. See L<Moose/Role/override>.
+
+=item B<inner>
+
+This is not supported and emits an error. See L<Moose/Role>.
+
+=item B<augment ($name, &sub)>
+
+This is not supported and emits an error. See L<Moose/Role>.
+
+=back
+
+=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
+