X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FRole.pm;h=b9f6b38707f1e48ebf09d25266edf40fb0fa6e95;hb=fce211ae5c3943a1b041b9c0985c4daf189fb8a8;hp=90370443e3716c13df4cd008281c69778ede0a9f;hpb=2e92bb89f22acc49ce81b6ec6593d6190559ac45;p=gitmo%2FMouse.git

diff --git a/lib/Mouse/Meta/Role.pm b/lib/Mouse/Meta/Role.pm
index 9037044..b9f6b38 100644
--- a/lib/Mouse/Meta/Role.pm
+++ b/lib/Mouse/Meta/Role.pm
@@ -1,40 +1,24 @@
-#!/usr/bin/env perl
 package Mouse::Meta::Role;
 use strict;
 use warnings;
-use Carp 'confess';
 
-do {
-    my %METACLASS_CACHE;
+use Mouse::Util qw(not_supported);
+use base qw(Mouse::Meta::Module);
 
-    # because Mouse doesn't introspect existing classes, we're forced to
-    # only pay attention to other Mouse classes
-    sub _metaclass_cache {
-        my $class = shift;
-        my $name  = shift;
-        return $METACLASS_CACHE{$name};
-    }
-
-    sub initialize {
-        my $class = shift;
-        my $name  = shift;
-        $METACLASS_CACHE{$name} = $class->new(name => $name)
-            if !exists($METACLASS_CACHE{$name});
-        return $METACLASS_CACHE{$name};
-    }
-};
-
-sub new {
+sub _new {
     my $class = shift;
     my %args  = @_;
 
+    $args{methods}          ||= {};
     $args{attributes}       ||= {};
     $args{required_methods} ||= [];
+    $args{roles}            ||= [];
 
     bless \%args, $class;
 }
 
-sub name { $_[0]->{name} }
+sub get_roles { $_[0]->{roles} }
+
 
 sub add_required_methods {
     my $self = shift;
@@ -49,80 +33,201 @@ sub add_attribute {
     $self->{attributes}->{$name} = $spec;
 }
 
-sub has_attribute { exists $_[0]->{attributes}->{$_[1]}  }
-sub get_attribute_list { keys %{ $_[0]->{attributes} } }
-sub get_attribute { $_[0]->{attributes}->{$_[1]} }
-
-# copied from Class::Inspector
-sub get_method_list {
-    my $self = shift;
-    my $name = $self->name;
+sub _check_required_methods{
+    my($role, $class, $args, @other_roles) = @_;
+
+    if($class->isa('Mouse::Meta::Class')){
+        my $class_name = $class->name;
+        foreach my $method_name(@{$role->{required_methods}}){
+            unless($class_name->can($method_name)){
+                my $role_name       = $role->name;
+                my $has_method      = 0;
+
+                foreach my $another_role_spec(@other_roles){
+                    my $another_role_name = $another_role_spec->[0];
+                    if($role_name ne $another_role_name && $another_role_name->can($method_name)){
+                        $has_method = 1;
+                        last;
+                    }
+                }
+                
+                $role->throw_error("'$role_name' requires the method '$method_name' to be implemented by '$class_name'")
+                    unless $has_method;
+            }
+        }
+    }
 
-    no strict 'refs';
-    # Get all the CODE symbol table entries
-    my @functions = grep !/^meta$/,
-      grep { /\A[^\W\d]\w*\z/o }
-      grep { defined &{"${name}::$_"} }
-      keys %{"${name}::"};
-    wantarray ? @functions : \@functions;
+    return;
 }
 
-sub apply {
-    my $self  = shift;
-    my $selfname = $self->name;
-    my $class = shift;
-    my $classname = $class->name;
+sub _apply_methods{
+    my($role, $class, $args) = @_;
+
+    my $role_name  = $role->name;
+    my $class_name = $class->name;
+    my $alias      = $args->{alias};
 
-    for my $name (@{$self->{required_methods}}) {
-        unless ($classname->can($name)) {
-            confess "'$selfname' requires the method '$name' to be implemented by '$classname'";
+    foreach my $method_name($role->get_method_list){
+        next if $method_name eq 'meta';
+
+        my $code = $role_name->can($method_name);
+        if(do{ no strict 'refs'; defined &{$class_name . '::' . $method_name} }){
+            # XXX what's Moose's behavior?
+        }
+        else{
+            $class->add_method($method_name => $code);
         }
-    }
 
-    {
-        no strict 'refs';
-        for my $name ($self->get_method_list) {
-            next if $name eq 'has' || $name eq 'requires' || $name eq 'meta' || $name eq 'with' || $name eq 'around' || $name eq 'before' || $name eq 'after' || $name eq 'blessed' || $name eq 'extends' || $name eq 'confess' || $name eq 'excludes';
-            if ($classname->can($name)) {
-                # XXX what's Moose's behavior?
-                next;
+        if($alias && $alias->{$method_name}){
+            my $dstname = $alias->{$method_name};
+            if(do{ no strict 'refs'; defined &{$class_name . '::' . $dstname} }){
+                # XXX wat's Moose's behavior?
+            }
+            else{
+                $class->add_method($dstname => $code);
             }
-            *{"${classname}::${name}"} = *{"${selfname}::${name}"};
         }
     }
 
-    for my $name ($self->get_attribute_list) {
-        next if $class->has_attribute($name);
-        my $spec = $self->get_attribute($name);
-        Mouse::Meta::Attribute->create($class, $name, %$spec);
+    return;
+}
+
+sub _apply_attributes{
+    my($role, $class, $args) = @_;
+
+    if ($class->isa('Mouse::Meta::Class')) {
+        # apply role to class
+        for my $attr_name ($role->get_attribute_list) {
+            next if $class->has_attribute($attr_name);
+
+            my $spec = $role->get_attribute($attr_name);
+
+            my $attr_metaclass = 'Mouse::Meta::Attribute';
+            if ( my $metaclass_name = $spec->{metaclass} ) {
+                $attr_metaclass = Mouse::Util::resolve_metaclass_alias(
+                    'Attribute',
+                    $metaclass_name
+                );
+            }
+
+            $attr_metaclass->create($class, $attr_name => %$spec);
+        }
+    } else {
+        # apply role to role
+        for my $attr_name ($role->get_attribute_list) {
+            next if $class->has_attribute($attr_name);
+
+            my $spec = $role->get_attribute($attr_name);
+            $class->add_attribute($attr_name => $spec);
+        }
     }
 
-    for my $modifier_type (qw/before after around/) {
-        my $add_method = "add_${modifier_type}_method_modifier";
-        my $modified = $self->{"${modifier_type}_method_modifiers"};
+    return;
+}
+
+sub _apply_modifiers{
+    my($role, $class, $args) = @_;
+
+    for my $modifier_type (qw/before after around override/) {
+        my $add_modifier = "add_${modifier_type}_method_modifier";
+        my $modifiers    = $role->{"${modifier_type}_method_modifiers"};
 
-        for my $method_name (keys %$modified) {
-            for my $code (@{ $modified->{$method_name} }) {
-                $class->$add_method($method_name => $code);
+        while(my($method_name, $modifier_codes) = each %{$modifiers}){
+            foreach my $code(@{$modifier_codes}){
+                $class->$add_modifier($method_name => $code);
             }
         }
     }
+    return;
 }
 
-for my $modifier_type (qw/before after around/) {
-    no strict 'refs';
-    *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub {
-        my ($self, $method_name, $method) = @_;
+sub _append_roles{
+    my($role, $class, $args) = @_;
 
-        push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} },
-            $method;
-    };
+    my $roles = $class->isa('Mouse::Meta::Class') ? $class->roles : $class->get_roles;
+
+    foreach my $r($role, @{$role->get_roles}){
+        if(!$class->does_role($r->name)){
+            push @{$roles}, $r;
+        }
+    }
+    return;
+}
+
+# Moose uses Application::ToInstance, Application::ToClass, Application::ToRole
+sub apply {
+    my($self, $class, %args) = @_;
+
+    if ($class->isa('Mouse::Object')) {
+        not_supported 'Application::ToInstance';
+    }
+
+    $self->_check_required_methods($class, \%args);
+    $self->_apply_methods($class, \%args);
+    $self->_apply_attributes($class, \%args);
+    $self->_apply_modifiers($class, \%args);
+    $self->_append_roles($class, \%args);
+    return;
+}
+
+sub combine_apply {
+    my(undef, $class, @roles) = @_;
+
+    foreach my $role_spec (@roles) {
+        my($role_name, $args) = @{$role_spec};
+
+        my $role = $role_name->meta;
 
-    *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub {
+        $role->_check_required_methods($class, $args, @roles);
+        $role->_apply_methods($class, $args);
+        $role->_apply_attributes($class, $args);
+        $role->_apply_modifiers($class, $args);
+        $role->_append_roles($class, $args);
+    }
+    return;
+}
+
+for my $modifier_type (qw/before after around override/) {
+
+    my $modifier = "${modifier_type}_method_modifiers";
+    my $add_method_modifier =  sub {
         my ($self, $method_name, $method) = @_;
-        @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] }
+
+        push @{ $self->{$modifier}->{$method_name} ||= [] }, $method;
+        return;
+    };
+    my $has_method_modifiers = sub{
+        my($self, $method_name) = @_;
+        my $m = $self->{$modifier}->{$method_name};
+        return $m && @{$m} != 0;
     };
+    my $get_method_modifiers = sub {
+        my ($self, $method_name) = @_;
+        return @{ $self->{$modifier}->{$method_name} ||= [] }
+    };
+
+    no strict 'refs';
+    *{ 'add_' . $modifier_type . '_method_modifier'  } = $add_method_modifier;
+    *{ 'has_' . $modifier_type . '_method_modifiers' } = $has_method_modifiers;
+    *{ 'get_' . $modifier_type . '_method_modifiers' } = $get_method_modifiers;
 }
 
+# This is currently not passing all the Moose tests.
+sub does_role {
+    my ($self, $role_name) = @_;
+
+    (defined $role_name)
+        || $self->throw_error("You must supply a role name to look for");
+
+    # if we are it,.. then return true
+    return 1 if $role_name eq $self->name;
+    # otherwise.. check our children
+    for my $role (@{ $self->get_roles }) {
+        return 1 if $role->does_role($role_name);
+    }
+    return 0;
+}
+
+
 1;