added attribute metaclass support.

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

diff --git a/lib/Mouse.pm b/lib/Mouse.pm
index 18c60d1..4731125 100644 (file)
--- a/lib/Mouse.pm
+++ b/lib/Mouse.pm
@@ -4,7 +4,7 @@ use warnings;
 use 5.006;
 use base 'Exporter';
 
-our $VERSION = '0.15';
+our $VERSION = '0.18';
 
 BEGIN {
     if ($ENV{MOUSE_DEBUG}) {
@@ -23,7 +23,7 @@ use Mouse::Meta::Class;
 use Mouse::Object;
 use Mouse::Util::TypeConstraints;
 
-our @EXPORT = qw(extends has before after around blessed confess with);
+our @EXPORT = qw(extends has before after around override super blessed confess with);
 
 sub extends { Mouse::Meta::Class->initialize(caller)->superclasses(@_) }
 
@@ -32,13 +32,25 @@ sub has {
 
     my $names = shift;
     $names = [$names] if !ref($names);
+    my $metaclass = 'Mouse::Meta::Attribute';
+    my %options = @_;
+
+    if ( my $metaclass_name = delete $options{metaclass} ) {
+        my $new_class = Mouse::Util::resolve_metaclass_alias(
+            'Attribute',
+            $metaclass_name
+        );
+        if ( $metaclass ne $new_class ) {
+            $metaclass = $new_class;
+        }
+    }
 
     for my $name (@$names) {
         if ($name =~ s/^\+//) {
-            Mouse::Meta::Attribute->clone_parent($meta, $name, @_);
+            $metaclass->clone_parent($meta, $name, @_);
         }
         else {
-            Mouse::Meta::Attribute->create($meta, $name, @_);
+            $metaclass->create($meta, $name, @_);
         }
     }
 }
@@ -77,6 +89,36 @@ sub with {
     Mouse::Util::apply_all_roles((caller)[0], @_);
 }
 
+our $SUPER_PACKAGE;
+our $SUPER_BODY;
+our @SUPER_ARGS;
+
+sub super {
+    # This check avoids a recursion loop - see
+    # t/100_bugs/020_super_recursion.t
+    return if defined $SUPER_PACKAGE && $SUPER_PACKAGE ne caller();
+    return unless $SUPER_BODY; $SUPER_BODY->(@SUPER_ARGS);
+}
+
+sub override {
+    my $meta = Mouse::Meta::Class->initialize(caller);
+    my $pkg = $meta->name;
+
+    my $name = shift;
+    my $code = shift;
+
+    my $body = $pkg->can($name)
+        or confess "You cannot override '$name' because it has no super method";
+
+    $meta->add_method($name => sub {
+        local $SUPER_PACKAGE = $pkg;
+        local @SUPER_ARGS = @_;
+        local $SUPER_BODY = $body;
+
+        $code->(@_);
+    });
+}
+
 sub import {
     my $class = shift;
 
@@ -214,11 +256,9 @@ Mouse aims to alleviate this by providing a subset of Moose's
 functionality, faster. In particular, L<Moose/has> is missing only a few
 expert-level features.
 
-We're also going as light on dependencies as possible. Most functions we use
-from L<Scalar::Util> are copied into this dist. L<Scalar::Util> is required if
-you'd like weak references; there's simply no way to do it from pure Perl.
-L<Class::Method::Modifiers> is required if you want support for L</before>,
-L</after>, and L</around>.
+We're also going as light on dependencies as possible.
+L<Class::Method::Modifiers> or L<Data::Util> is required if you want support
+for L</before>, L</after>, and L</around>.
 
 =head2 MOOSE COMPAT
 
@@ -231,8 +271,15 @@ The idea is that, if you need the extra power, you should be able to run
 C<s/Mouse/Moose/g> on your codebase and have nothing break. To that end,
 nothingmuch has written L<Squirrel> (part of this distribution) which will act
 as Mouse unless Moose is loaded, in which case it will act as Moose.
+L<Any::Moose> is a more high-tech L<Squirrel>.
+
+=head2 MouseX
+
+Please don't copy MooseX code to MouseX. If you need extensions, you really
+should upgrade to Moose. We don't need two parallel sets of extensions!
 
-Mouse also has the blessings of Moose's author, stevan.
+If you really must write a Mouse extension, please contact the Moose mailing
+list or #moose on IRC beforehand.
 
 =head1 KEYWORDS