From: gfx <g.psy.va@gmail.com>
Date: Fri, 14 Aug 2009 00:33:14 +0000 (+0900)
Subject: Make "use Moose -extends => [@superclasses]" establish is-a relationship at compile... 
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=e0abefb7a09a8e8e8f5d6070dfcb556ac23c7919;p=gitmo%2FMoose.git

Make "use Moose -extends => [@superclasses]" establish is-a relationship at compile time.
---

diff --git a/lib/Moose/Exporter.pm b/lib/Moose/Exporter.pm
index c8265bc..7ec2dc0 100644
--- a/lib/Moose/Exporter.pm
+++ b/lib/Moose/Exporter.pm
@@ -373,6 +373,9 @@ sub _make_import_sub {
             'Class' => $metaclass
         ) if defined $metaclass && length $metaclass;
 
+        my $superclasses;
+        ( $superclasses, @_ ) = _strip_extends(@_);
+
         # Normally we could look at $_[0], but in some weird cases
         # (involving goto &Moose::import), $_[0] ends as something
         # else (like Squirrel).
@@ -406,6 +409,16 @@ sub _make_import_sub {
             $did_init_meta = 1;
         }
 
+        if(@{$superclasses}){
+            if($did_init_meta){
+                $CALLER->meta->superclasses(@{$superclasses});
+            }
+            else{
+                require Moose;
+                Moose->throw_error("Cannot provide -extends when $class does not have an init_meta() method");
+            }
+        }
+
         if ( $did_init_meta && @{$traits} ) {
             # The traits will use Moose::Role, which in turn uses
             # Moose::Exporter, which in turn sets $CALLER, so we need
@@ -451,6 +464,20 @@ sub _strip_metaclass {
     return ( $metaclass, @_ );
 }
 
+sub _strip_extends {
+    my $idx = first_index { $_ eq '-extends' } @_;
+
+    return ( [], @_ ) unless $idx >= 0 && $#_ >= $idx + 1;
+
+    my $superclasses = $_[ $idx + 1 ];
+
+    splice @_, $idx, 2;
+
+    $superclasses = [ $superclasses ] unless ref $superclasses;
+
+    return ( $superclasses, @_ );
+}
+
 sub _apply_meta_traits {
     my ( $class, $traits ) = @_;