-#!/usr/bin/env perl
package Mouse::Meta::Class;
-use strict;
-use warnings;
+use Mouse::Util qw/:meta get_linear_isa not_supported/; # enables strict and warnings
-use Scalar::Util 'blessed';
+use Scalar::Util qw/blessed weaken/;
-use MRO::Compat;
+use Mouse::Meta::Module;
+our @ISA = qw(Mouse::Meta::Module);
-do {
- my %METACLASS_CACHE;
+sub attribute_metaclass;
+sub method_metaclass;
- # 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 constructor_class;
+sub destructor_class;
- sub initialize {
- my $class = shift;
- my $name = shift;
- $METACLASS_CACHE{$name} = $class->new(name => $name)
- if !exists($METACLASS_CACHE{$name});
- return $METACLASS_CACHE{$name};
- }
-};
+my @MetaClassTypes = qw(
+ attribute_metaclass
+ method_metaclass
+ constructor_class
+ destructor_class
+);
-sub new {
- my $class = shift;
- my %args = @_;
+sub _construct_meta {
+ my($class, %args) = @_;
$args{attributes} = {};
+ $args{methods} = {};
+ $args{roles} = [];
+
$args{superclasses} = do {
no strict 'refs';
- \@{ $args{name} . '::ISA' };
+ \@{ $args{package} . '::ISA' };
};
- bless \%args, $class;
+ my $self = bless \%args, ref($class) || $class;
+ if(ref($self) ne __PACKAGE__){
+ $self->meta->_initialize_object($self, \%args);
+ }
+ return $self;
}
-sub name { $_[0]->{name} }
+sub create_anon_class{
+ my $self = shift;
+ return $self->create(undef, @_);
+}
+
+sub is_anon_class;
+
+sub roles;
+
+sub calculate_all_roles {
+ my $self = shift;
+ my %seen;
+ return grep { !$seen{ $_->name }++ }
+ map { $_->calculate_all_roles } @{ $self->roles };
+}
sub superclasses {
my $self = shift;
if (@_) {
- Mouse::load_class($_) for @_;
+ foreach my $super(@_){
+ Mouse::Util::load_class($super);
+ my $meta = Mouse::Util::get_metaclass_by_name($super);
+
+ next if not defined $meta;
+
+ if(Mouse::Util::is_a_metarole($meta)){
+ $self->throw_error("You cannot inherit from a Mouse Role ($super)");
+ }
+
+ next if $self->isa(ref $meta); # _superclass_meta_is_compatible
+
+ $self->_reconcile_with_superclass_meta($meta);
+ }
@{ $self->{superclasses} } = @_;
}
- @{ $self->{superclasses} };
+ return @{ $self->{superclasses} };
+}
+
+sub _reconcile_with_superclass_meta {
+ my($self, $super_meta) = @_;
+
+ # find incompatible traits
+ my @incompatibles;
+ foreach my $metaclass_type(@MetaClassTypes){
+ my $super_c = $super_meta->$metaclass_type();
+ my $self_c = $self->$metaclass_type();
+
+ if(!$super_c->isa($self_c)){
+ push @incompatibles, ($metaclass_type => $super_c);
+ }
+ }
+
+ my @roles;
+ foreach my $role($super_meta->meta->calculate_all_roles){
+ if(!$self->meta->does_role($role->name)){
+ push @roles, $role->name;
+ }
+ }
+
+ #print "reconcile($self vs. $super_meta; @roles; @incompatibles)\n";
+
+ require Mouse::Util::MetaRole;
+ Mouse::Util::MetaRole::apply_metaclass_roles(
+ for_class => $self,
+ metaclass => ref $super_meta,
+ metaclass_roles => \@roles,
+ @incompatibles,
+ );
+ return;
+}
+
+sub find_method_by_name{
+ my($self, $method_name) = @_;
+ defined($method_name)
+ or $self->throw_error('You must define a method name to find');
+
+ foreach my $class( $self->linearized_isa ){
+ my $method = $self->initialize($class)->get_method($method_name);
+ return $method if defined $method;
+ }
+ return undef;
+}
+
+sub get_all_methods {
+ my($self) = @_;
+ return map{ $self->find_method_by_name($_) } $self->get_all_method_names;
+}
+
+sub get_all_method_names {
+ my $self = shift;
+ my %uniq;
+ return grep { $uniq{$_}++ == 0 }
+ map { Mouse::Meta::Class->initialize($_)->get_method_list() }
+ $self->linearized_isa;
+}
+
+sub find_attribute_by_name{
+ my($self, $name) = @_;
+ my $attr;
+ foreach my $class($self->linearized_isa){
+ my $meta = Mouse::Util::get_metaclass_by_name($class) or next;
+ $attr = $meta->get_attribute($name) and last;
+ }
+ return $attr;
}
sub add_attribute {
my $self = shift;
- my $attr = shift;
- $self->{'attributes'}{$attr->name} = $attr;
+ my($attr, $name);
+
+ if(blessed $_[0]){
+ $attr = $_[0];
+
+ $attr->isa('Mouse::Meta::Attribute')
+ || $self->throw_error("Your attribute must be an instance of Mouse::Meta::Attribute (or a subclass)");
+
+ $name = $attr->name;
+ }
+ else{
+ # _process_attribute
+ $name = shift;
+
+ my %args = (@_ == 1) ? %{$_[0]} : @_;
+
+ defined($name)
+ or $self->throw_error('You must provide a name for the attribute');
+
+ if ($name =~ s/^\+//) { # inherited attributes
+ my $inherited_attr = $self->find_attribute_by_name($name)
+ or $self->throw_error("Could not find an attribute by the name of '$name' to inherit from in ".$self->name);
+
+ $attr = $inherited_attr->clone_and_inherit_options(%args);
+ }
+ else{
+ my($attribute_class, @traits) = $self->attribute_metaclass->interpolate_class(\%args);
+ $args{traits} = \@traits if @traits;
+
+ $attr = $attribute_class->new($name, %args);
+ }
+ }
+
+ weaken( $attr->{associated_class} = $self );
+
+ $self->{attributes}{$attr->name} = $attr;
+ $attr->install_accessors();
+
+ if(Mouse::Util::_MOUSE_VERBOSE && !$attr->{associated_methods} && ($attr->{is} || '') ne 'bare'){
+ Carp::cluck(qq{Attribute (}.$attr->name.qq{) of class }.$self->name.qq{ has no associated methods (did you mean to provide an "is" argument?)});
+ }
+ return $attr;
}
-sub compute_all_applicable_attributes {
+sub compute_all_applicable_attributes { # DEPRECATED
+ Carp::cluck('compute_all_applicable_attributes() has been deprecated. Use get_all_attributes() instead');
+
+ return shift->get_all_attributes(@_)
+}
+
+sub linearized_isa;
+
+sub new_object;
+
+sub clone_object {
+ my $class = shift;
+ my $object = shift;
+ my $args = $object->Mouse::Object::BUILDARGS(@_);
+
+ (blessed($object) && $object->isa($class->name))
+ || $class->throw_error("You must pass an instance of the metaclass (" . $class->name . "), not ($object)");
+
+ my $cloned = bless { %$object }, ref $object;
+ $class->_initialize_object($cloned, $args);
+
+ return $cloned;
+}
+
+sub clone_instance { # DEPRECATED
+ my ($class, $instance, %params) = @_;
+
+ Carp::cluck('clone_instance() has been deprecated. Use clone_object() instead');
+
+ return $class->clone_object($instance, %params);
+}
+
+
+sub immutable_options {
+ my ( $self, @args ) = @_;
+
+ return (
+ inline_constructor => 1,
+ inline_destructor => 1,
+ constructor_name => 'new',
+ @args,
+ );
+}
+
+
+sub make_immutable {
my $self = shift;
- my (@attr, %seen);
+ my %args = $self->immutable_options(@_);
+
+ $self->{is_immutable}++;
+
+ $self->{strict_constructor} = $args{strict_constructor};
+
+ if ($args{inline_constructor}) {
+ my $c = $self->constructor_class;
+ Mouse::Util::load_class($c);
+ $self->add_method($args{constructor_name} =>
+ $c->_generate_constructor($self, \%args));
+ }
+
+ if ($args{inline_destructor}) {
+ my $c = $self->destructor_class;
+ Mouse::Util::load_class($c);
+ $self->add_method(DESTROY =>
+ $c->_generate_destructor($self, \%args));
+ }
+
+ # Moose's make_immutable returns true allowing calling code to skip setting an explicit true value
+ # at the end of a source file.
+ return 1;
+}
+
+sub make_mutable {
+ my($self) = @_;
+ $self->{is_immutable} = 0;
+ return;
+}
+
+sub is_immutable;
+sub is_mutable { !$_[0]->is_immutable }
+
+sub _install_modifier_pp{
+ my( $self, $type, $name, $code ) = @_;
+ my $into = $self->name;
+
+ my $original = $into->can($name)
+ or $self->throw_error("The method '$name' is not found in the inheritance hierarchy for class $into");
+
+ my $modifier_table = $self->{modifiers}{$name};
+
+ if(!$modifier_table){
+ my(@before, @after, @around, $cache, $modified);
+
+ $cache = $original;
+
+ $modified = sub {
+ for my $c (@before) { $c->(@_) }
+
+ if(wantarray){ # list context
+ my @rval = $cache->(@_);
+
+ for my $c(@after){ $c->(@_) }
+ return @rval;
+ }
+ elsif(defined wantarray){ # scalar context
+ my $rval = $cache->(@_);
+
+ for my $c(@after){ $c->(@_) }
+ return $rval;
+ }
+ else{ # void context
+ $cache->(@_);
+
+ for my $c(@after){ $c->(@_) }
+ return;
+ }
+ };
+
+ $self->{modifiers}{$name} = $modifier_table = {
+ original => $original,
+
+ before => \@before,
+ after => \@after,
+ around => \@around,
+
+ cache => \$cache, # cache for around modifiers
+ };
+
+ $self->add_method($name => $modified);
+ }
+
+ if($type eq 'before'){
+ unshift @{$modifier_table->{before}}, $code;
+ }
+ elsif($type eq 'after'){
+ push @{$modifier_table->{after}}, $code;
+ }
+ else{ # around
+ push @{$modifier_table->{around}}, $code;
+
+ my $next = ${ $modifier_table->{cache} };
+ ${ $modifier_table->{cache} } = sub{ $code->($next, @_) };
+ }
+
+ return;
+}
+
+sub _install_modifier {
+ my ( $self, $type, $name, $code ) = @_;
+
+ # load Class::Method::Modifiers first
+ my $no_cmm_fast = do{
+ local $@;
+ eval q{ use Class::Method::Modifiers::Fast 0.041 () };
+ $@;
+ };
+
+ my $impl;
+ if($no_cmm_fast){
+ $impl = \&_install_modifier_pp;
+ }
+ else{
+ my $install_modifier = Class::Method::Modifiers::Fast->can('install_modifier');
+ $impl = sub {
+ my ( $self, $type, $name, $code ) = @_;
+ my $into = $self->name;
+ $install_modifier->($into, $type, $name, $code);
+
+ $self->add_method($name => do{
+ no strict 'refs';
+ \&{ $into . '::' . $name };
+ });
+ return;
+ };
+ }
+
+ # replace this method itself :)
+ {
+ no warnings 'redefine';
+ *_install_modifier = $impl;
+ }
+
+ $self->$impl( $type, $name, $code );
+}
+
+sub add_before_method_modifier {
+ my ( $self, $name, $code ) = @_;
+ $self->_install_modifier( 'before', $name, $code );
+}
+
+sub add_around_method_modifier {
+ my ( $self, $name, $code ) = @_;
+ $self->_install_modifier( 'around', $name, $code );
+}
+
+sub add_after_method_modifier {
+ my ( $self, $name, $code ) = @_;
+ $self->_install_modifier( 'after', $name, $code );
+}
+
+sub add_override_method_modifier {
+ my ($self, $name, $code) = @_;
+
+ if($self->has_method($name)){
+ $self->throw_error("Cannot add an override method if a local method is already present");
+ }
+
+ my $package = $self->name;
+
+ my $super_body = $package->can($name)
+ or $self->throw_error("You cannot override '$name' because it has no super method");
+
+ $self->add_method($name => sub {
+ local $Mouse::SUPER_PACKAGE = $package;
+ local $Mouse::SUPER_BODY = $super_body;
+ local @Mouse::SUPER_ARGS = @_;
+
+ $code->(@_);
+ });
+ return;
+}
+
+sub add_augment_method_modifier {
+ my ($self, $name, $code) = @_;
+ if($self->has_method($name)){
+ $self->throw_error("Cannot add an augment method if a local method is already present");
+ }
+
+ my $super = $self->find_method_by_name($name)
+ or $self->throw_error("You cannot augment '$name' because it has no super method");
+
+ my $super_package = $super->package_name;
+ my $super_body = $super->body;
+
+ $self->add_method($name => sub{
+ local $Mouse::INNER_BODY{$super_package} = $code;
+ local $Mouse::INNER_ARGS{$super_package} = [@_];
+ $super_body->(@_);
+ });
+ return;
+}
+
+sub does_role {
+ my ($self, $role_name) = @_;
+
+ (defined $role_name)
+ || $self->throw_error("You must supply a role name to look for");
for my $class ($self->linearized_isa) {
- my $meta = $self->_metaclass_cache($class)
+ my $meta = Mouse::Util::get_metaclass_by_name($class)
or next;
- for my $name (keys %{ $meta->get_attribute_map }) {
- next if $seen{$name}++;
- push @attr, $meta->get_attribute($name);
+ for my $role (@{ $meta->roles }) {
+
+ return 1 if $role->does_role($role_name);
}
}
- return @attr;
+ return 0;
}
-sub get_attribute_map { $_[0]->{attributes} }
-sub has_attribute { exists $_[0]->{attributes}->{$_[1]} }
-sub get_attribute { $_[0]->{attributes}->{$_[1]} }
-
-sub linearized_isa { @{ mro::get_linear_isa($_[0]->name) } }
-
1;
-
__END__
=head1 NAME
-Mouse::Meta::Class - hook into the Mouse MOP
+Mouse::Meta::Class - The Mouse class metaclass
-=head1 METHODS
+=head1 VERSION
-=head2 initialize ClassName -> Mouse::Meta::Class
+This document describes Mouse version 0.50_01
-Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only
-one instance should exist for a given class.
+=head1 METHODS
-=head2 new %args -> Mouse::Meta::Class
+=head2 C<< initialize(ClassName) -> Mouse::Meta::Class >>
-Creates a new Mouse::Meta::Class. Don't call this directly.
+Finds or creates a C<Mouse::Meta::Class> instance for the given ClassName. Only
+one instance should exist for a given class.
-=head2 name -> ClassName
+=head2 C<< name -> ClassName >>
Returns the name of the owner class.
-=head2 superclasses -> [ClassName]
+=head2 C<< superclasses -> ClassNames >> C<< superclass(ClassNames) >>
Gets (or sets) the list of superclasses of the owner class.
-=head2 add_attribute Mouse::Meta::Attribute
+=head2 C<< add_method(name => CodeRef) >>
+
+Adds a method to the owner class.
+
+=head2 C<< has_method(name) -> Bool >>
+
+Returns whether we have a method with the given name.
+
+=head2 C<< get_method(name) -> Mouse::Meta::Method | undef >>
+
+Returns a L<Mouse::Meta::Method> with the given name.
+
+Note that you can also use C<< $metaclass->name->can($name) >> for a method body.
+
+=head2 C<< get_method_list -> Names >>
+
+Returns a list of method names which are defined in the local class.
+If you want a list of all applicable methods for a class, use the
+C<get_all_methods> method.
+
+=head2 C<< get_all_methods -> (Mouse::Meta::Method) >>
+
+Return the list of all L<Mouse::Meta::Method> instances associated with
+the class and its superclasses.
+
+=head2 C<< add_attribute(name => spec | Mouse::Meta::Attribute) >>
Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner
class.
-=head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute)
+=head2 C<< has_attribute(Name) -> Bool >>
+
+Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
+
+=head2 C<< get_attribute Name -> Mouse::Meta::Attribute | undef >>
+
+Returns the L<Mouse::Meta::Attribute> with the given name.
+
+=head2 C<< get_attribute_list -> Names >>
+
+Returns a list of attribute names which are defined in the local
+class. If you want a list of all applicable attributes for a class,
+use the C<get_all_attributes> method.
+
+=head2 C<< get_all_attributes -> (Mouse::Meta::Attribute) >>
Returns the list of all L<Mouse::Meta::Attribute> instances associated with
this class and its superclasses.
-=head2 get_attribute_map -> { name => Mouse::Meta::Attribute }
+=head2 C<< linearized_isa -> [ClassNames] >>
-Returns a mapping of attribute names to their corresponding
-L<Mouse::Meta::Attribute> objects.
+Returns the list of classes in method dispatch order, with duplicates removed.
-=head2 has_attribute Name -> Boool
+=head2 C<< new_object(Parameters) -> Instance >>
-Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
+Creates a new instance.
-=head2 get_attribute Name -> Mouse::Meta::Attribute | undef
+=head2 C<< clone_object(Instance, Parameters) -> Instance >>
-Returns the L<Mouse::Meta::Attribute> with the given name.
+Clones the given instance which must be an instance governed by this
+metaclass.
-=head2 linearized_isa -> [ClassNames]
+=head2 C<< throw_error(Message, Parameters) >>
-Returns the list of classes in method dispatch order, with duplicates removed.
+Throws an error with the given message.
+
+=head1 SEE ALSO
+
+L<Mouse::Meta::Module>
+
+L<Moose::Meta::Class>
+
+L<Class::MOP::Class>
=cut
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