X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMouse.git;a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FAttribute.pm;h=71a2bbdf178659ab4c40eb3d155210f13efa9a6d;hp=d356c74ffd14824a5cfef14104de178b011d33ec;hb=1372fcc0864d73696fe1b926d489b455be26229e;hpb=df77fd72ab8342a9406153b271fa8358e1a5fcae

diff --git a/lib/Mouse/Meta/Attribute.pm b/lib/Mouse/Meta/Attribute.pm
index d356c74..71a2bbd 100644
--- a/lib/Mouse/Meta/Attribute.pm
+++ b/lib/Mouse/Meta/Attribute.pm
@@ -1,14 +1,12 @@
 package Mouse::Meta::Attribute;
-use strict;
-use warnings;
+use Mouse::Util qw(:meta); # enables strict and warnings
 
 use Carp ();
 
-use Mouse::Util qw(:meta);
-
 use Mouse::Meta::TypeConstraint;
 use Mouse::Meta::Method::Accessor;
 
+
 sub _process_options{
     my($class, $name, $args) = @_;
 
@@ -82,8 +80,7 @@ sub _process_options{
         $args->{type_constraint} = Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($args->{isa});
     }
     elsif(exists $args->{does}){
-        # TODO
-        # $args->{type_constraint} = Mouse::Util::TypeConstraints::find_or_create_does_type_constraint($args->{does});
+        $args->{type_constraint} = Mouse::Util::TypeConstraints::find_or_create_does_type_constraint($args->{does});
     }
     $tc = $args->{type_constraint};
 
@@ -208,7 +205,7 @@ sub _create_args { # DEPRECATED
 }
 
 sub interpolate_class{
-    my($class, $name, $args) = @_;
+    my($class, $args) = @_;
 
     if(my $metaclass = delete $args->{metaclass}){
         $class = Mouse::Util::resolve_metaclass_alias( Attribute => $metaclass );
@@ -217,17 +214,21 @@ sub interpolate_class{
     my @traits;
     if(my $traits_ref = delete $args->{traits}){
 
-        for (my $i = 0; $i < @{$traits_ref}; $i++) {
-            my $trait = Mouse::Util::resolve_metaclass_alias(Attribute => $traits_ref->[$i], trait => 1);
+        local $@;
+        eval{
+            for (my $i = 0; $i < @{$traits_ref}; $i++) {
+                my $trait = Mouse::Util::resolve_metaclass_alias(Attribute => $traits_ref->[$i], trait => 1);
 
-            next if $class->does($trait);
+                next if $class->does($trait);
 
-            push @traits, $trait;
+                push @traits, $trait;
 
-            # are there options?
-            push @traits, $traits_ref->[++$i]
-                if ref($traits_ref->[$i+1]);
-        }
+                # are there options?
+                push @traits, $traits_ref->[++$i]
+                    if ref($traits_ref->[$i+1]);
+            }
+        };
+        warn "Fatal error in traits: $@" if _MOUSE_VERBOSE;
 
         if (@traits) {
             $class = Mouse::Meta::Class->create_anon_class(
@@ -251,7 +252,7 @@ sub canonicalize_args{ # DEPRECATED
     return %args;
 }
 
-sub create {
+sub create { # DEPRECATED
     my ($self, $class, $name, %args) = @_;
 
     Carp::cluck("$self->create has been deprecated."
@@ -266,15 +267,12 @@ sub _coerce_and_verify {
     my($self, $value, $instance) = @_;
 
     my $type_constraint = $self->{type_constraint};
-
-    return $value if !$type_constraint;
+    return $value if !defined $type_constraint;
 
     if ($self->should_coerce && $type_constraint->has_coercion) {
         $value = $type_constraint->coerce($value);
     }
 
-    return $value if $type_constraint->check($value);
-
     $self->verify_against_type_constraint($value);
 
     return $value;
@@ -284,7 +282,7 @@ sub verify_against_type_constraint {
     my ($self, $value) = @_;
 
     my $type_constraint = $self->{type_constraint};
-    return 1 if !$type_constraint;;
+    return 1 if !$type_constraint;
     return 1 if $type_constraint->check($value);
 
     $self->verify_type_constraint_error($self->name, $value, $type_constraint);
@@ -292,7 +290,8 @@ sub verify_against_type_constraint {
 
 sub verify_type_constraint_error {
     my($self, $name, $value, $type) = @_;
-    $self->throw_error("Attribute ($name) does not pass the type constraint because: " . $type->get_message($value));
+    $self->throw_error("Attribute ($name) does not pass the type constraint because: "
+        . $type->get_message($value));
 }
 
 sub coerce_constraint { # DEPRECATED
@@ -304,26 +303,13 @@ sub coerce_constraint { # DEPRECATED
     return Mouse::Util::TypeConstraints->typecast_constraints($_[0]->associated_class->name, $type, $_[1]);
 }
 
-sub _canonicalize_handles {
-    my $self    = shift;
-    my $handles = shift;
-
-    if (ref($handles) eq 'HASH') {
-        return %$handles;
-    }
-    elsif (ref($handles) eq 'ARRAY') {
-        return map { $_ => $_ } @$handles;
-    }
-    else {
-        $self->throw_error("Unable to canonicalize the 'handles' option with $handles");
-    }
-}
-
 sub clone_and_inherit_options{
-    my $self = shift;
-    my $name = shift;
+    my($self, %args) = @_;
+
+    my($attribute_class, @traits) = ref($self)->interpolate_class(\%args);
 
-    return ref($self)->new($name, %{$self}, (@_ == 1) ? %{$_[0]} : @_);
+    $args{traits} = \@traits if @traits;
+    return $attribute_class->new($self->name, %{$self}, %args);
 }
 
 sub clone_parent { # DEPRECATED
@@ -354,10 +340,10 @@ sub get_parent_args { # DEPRECATED
 }
 
 
-sub get_read_method { # DEPRECATED
+sub get_read_method {
     $_[0]->{reader} || $_[0]->{accessor}
 }
-sub get_write_method { # DEPRECATED
+sub get_write_method {
     $_[0]->{writer} || $_[0]->{accessor}
 }
 
@@ -373,7 +359,7 @@ sub get_read_method_ref{
             $metaclass->name->can($reader);
         }
         else{
-            Mouse::Meta::Method::Accessor->_generate_reader($self, undef, $metaclass);
+            $self->accessor_metaclass->_generate_reader($self, $metaclass);
         }
     };
 }
@@ -390,32 +376,73 @@ sub get_write_method_ref{
             $metaclass->name->can($reader);
         }
         else{
-            Mouse::Meta::Method::Accessor->_generate_writer($self, undef, $metaclass);
+            $self->accessor_metaclass->_generate_writer($self, $metaclass);
         }
     };
 }
 
+sub _canonicalize_handles {
+    my($self, $handles) = @_;
+
+    if (ref($handles) eq 'HASH') {
+        return %$handles;
+    }
+    elsif (ref($handles) eq 'ARRAY') {
+        return map { $_ => $_ } @$handles;
+    }
+    elsif (ref($handles) eq 'Regexp') {
+        my $class_or_role = ($self->{isa} || $self->{does})
+            || $self->throw_error("Cannot delegate methods based on a Regexp without a type constraint (isa)");
+
+        my $meta = Mouse::Meta::Class->initialize("$class_or_role"); # "" for stringify
+        return map  { $_ => $_ }
+               grep { $_ ne 'meta' && !Mouse::Object->can($_) && $_ =~ $handles }
+                   $meta->isa('Mouse::Meta::Class') ? $meta->get_all_method_names : $meta->get_method_list;
+    }
+    else {
+        $self->throw_error("Unable to canonicalize the 'handles' option with $handles");
+    }
+}
+
+
 sub associate_method{
     my ($attribute, $method) = @_;
     $attribute->{associated_methods}++;
     return;
 }
 
+sub accessor_metaclass(){ 'Mouse::Meta::Method::Accessor' }
+
 sub install_accessors{
     my($attribute) = @_;
 
-    my $metaclass       = $attribute->{associated_class};
+    my $metaclass      = $attribute->{associated_class};
+    my $accessor_class = $attribute->accessor_metaclass;
 
-    foreach my $type(qw(accessor reader writer predicate clearer handles)){
+    foreach my $type(qw(accessor reader writer predicate clearer)){
         if(exists $attribute->{$type}){
-            my $installer    = '_generate_' . $type;
+            my $generator = '_generate_' . $type;
+            my $code      = $accessor_class->$generator($attribute, $metaclass);
+            $metaclass->add_method($attribute->{$type} => $code);
+            $attribute->associate_method($code);
+        }
+    }
+
+    # install delegation
+    if(exists $attribute->{handles}){
+        my %handles = $attribute->_canonicalize_handles($attribute->{handles});
+        my $reader  = $attribute->get_read_method_ref;
 
-            Mouse::Meta::Method::Accessor->$installer($attribute, $attribute->{$type}, $metaclass);
+        while(my($handle_name, $method_to_call) = each %handles){
+            my $code = $accessor_class->_generate_delegation($attribute, $metaclass,
+                $reader, $handle_name, $method_to_call);
 
-            $attribute->{associated_methods}++;
+            $metaclass->add_method($handle_name => $code);
+            $attribute->associate_method($code);
         }
     }
 
+
     if($attribute->can('create') != \&create){
         # backword compatibility
         $attribute->create($metaclass, $attribute->name, %{$attribute});
@@ -439,6 +466,10 @@ __END__
 
 Mouse::Meta::Attribute - The Mouse attribute metaclass
 
+=head1 VERSION
+
+This document describes Mouse version 0.39
+
 =head1 METHODS
 
 =head2 C<< new(%options) -> Mouse::Meta::Attribute >>
@@ -562,13 +593,13 @@ on success, otherwise C<confess>es.
 Creates a new attribute in the owner class, inheriting options from parent classes.
 Accessors and helper methods are installed. Some error checking is done.
 
-=item C<< get_read_method_ref >>
-
-=item C<< get_write_method_ref >>
-
-Returns the subroutine reference of a method suitable for reading or
-writing the attribute's value in the associated class. These methods
-always return a subroutine reference, regardless of whether or not the
+=head2 C<< get_read_method_ref >>
+
+=head2 C<< get_write_method_ref >>
+
+Returns the subroutine reference of a method suitable for reading or
+writing the attribute's value in the associated class. These methods
+always return a subroutine reference, regardless of whether or not the
 attribute is read- or write-only.
 
 =head1 SEE ALSO