package Mouse::Meta::Class;
-use strict;
-use warnings;
+use Mouse::Util qw/:meta/; # enables strict and warnings
-use Scalar::Util qw/blessed weaken/;
+use Scalar::Util ();
-use Mouse::Util qw/:meta get_linear_isa not_supported/;
-
-use Mouse::Meta::Method::Constructor;
-use Mouse::Meta::Method::Destructor;
use Mouse::Meta::Module;
our @ISA = qw(Mouse::Meta::Module);
-sub method_metaclass(){ 'Mouse::Meta::Method' } # required for get_method()
+our @CARP_NOT = qw(Mouse); # trust Mouse
+
+sub attribute_metaclass;
+sub method_metaclass;
+
+sub constructor_class;
+sub destructor_class;
+
sub _construct_meta {
my($class, %args) = @_;
- $args{attributes} ||= {};
- $args{methods} ||= {};
- $args{roles} ||= [];
+ $args{attributes} = {};
+ $args{methods} = {};
+ $args{roles} = [];
$args{superclasses} = do {
no strict 'refs';
\@{ $args{package} . '::ISA' };
};
- #return Mouse::Meta::Class->initialize($class)->new_object(%args)
- # if $class ne __PACKAGE__;
-
- return bless \%args, ref($class) || $class;
+ my $self = bless \%args, ref($class) || $class;
+ if(ref($self) ne __PACKAGE__){
+ $self->meta->_initialize_object($self, \%args);
+ }
+ return $self;
}
sub create_anon_class{
return $self->create(undef, @_);
}
-sub is_anon_class{
- return exists $_[0]->{anon_serial_id};
-}
+sub is_anon_class;
-sub roles { $_[0]->{roles} }
+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 @_;
- @{ $self->{superclasses} } = @_;
+ foreach my $super(@_){
+ Mouse::Util::load_class($super);
+ my $meta = Mouse::Util::get_metaclass_by_name($super);
+ next if $self->verify_superclass($super, $meta);
+ $self->_reconcile_with_superclass_meta($meta);
+ }
+ return @{ $self->{superclasses} } = @_;
}
return @{ $self->{superclasses} };
}
-sub find_method_by_name{
+sub verify_superclass {
+ my($self, $super, $super_meta) = @_;
+
+ if(defined $super_meta) {
+ if(Mouse::Util::is_a_metarole($super_meta)){
+ $self->throw_error("You cannot inherit from a Mouse Role ($super)");
+ }
+ }
+ else {
+ # The metaclass of $super is not initialized.
+ # i.e. it might be Mouse::Object, a mixin package (e.g. Exporter),
+ # or a foreign class including Moose classes.
+ # See also Mouse::Foreign::Meta::Role::Class.
+ my $mm = $super->can('meta');
+ if(!($mm && $mm == \&Mouse::Util::meta)) {
+ if($super->can('new') or $super->can('DESTROY')) {
+ $self->inherit_from_foreign_class($super);
+ }
+ }
+ return 1; # always ok
+ }
+
+ return $self->isa(ref $super_meta); # checks metaclass compatibility
+}
+
+sub inherit_from_foreign_class {
+ my($class, $super) = @_;
+ Carp::carp("You inherit from non-Mouse class ($super),"
+ . " but it is unlikely to work correctly."
+ . " Please consider using MouseX::Foreign");
+ return;
+}
+
+my @MetaClassTypes = (
+ 'attribute', # Mouse::Meta::Attribute
+ 'method', # Mouse::Meta::Method
+ 'constructor', # Mouse::Meta::Method::Constructor
+ 'destructor', # Mouse::Meta::Method::Destructor
+);
+
+sub _reconcile_with_superclass_meta {
+ my($self, $other) = @_;
+
+ # find incompatible traits
+ my %metaroles;
+ foreach my $metaclass_type(@MetaClassTypes){
+ my $accessor = $self->can($metaclass_type . '_metaclass')
+ || $self->can($metaclass_type . '_class');
+
+ my $other_c = $other->$accessor();
+ my $self_c = $self->$accessor();
+
+ if(!$self_c->isa($other_c)){
+ $metaroles{$metaclass_type}
+ = [ $self_c->meta->_collect_roles($other_c->meta) ];
+ }
+ }
+
+ $metaroles{class} = [$self->meta->_collect_roles($other->meta)];
+
+ #use Data::Dumper; print Data::Dumper->new([\%metaroles], ['*metaroles'])->Indent(1)->Dump;
+
+ require Mouse::Util::MetaRole;
+ $_[0] = Mouse::Util::MetaRole::apply_metaroles(
+ for => $self,
+ class_metaroles => \%metaroles,
+ );
+ return;
+}
+
+sub _collect_roles {
+ my ($self, $other) = @_;
+
+ # find common ancestor
+ my @self_lin_isa = $self->linearized_isa;
+ my @other_lin_isa = $other->linearized_isa;
+
+ my(@self_anon_supers, @other_anon_supers);
+ push @self_anon_supers, shift @self_lin_isa while $self_lin_isa[0]->meta->is_anon_class;
+ push @other_anon_supers, shift @other_lin_isa while $other_lin_isa[0]->meta->is_anon_class;
+
+ my $common_ancestor = $self_lin_isa[0] eq $other_lin_isa[0] && $self_lin_isa[0];
+
+ if(!$common_ancestor){
+ $self->throw_error(sprintf '%s cannot have %s as a super class because of their metaclass incompatibility',
+ $self->name, $other->name);
+ }
+
+ my %seen;
+ return sort grep { !$seen{$_}++ } ## no critic
+ (map{ $_->name } map{ $_->meta->calculate_all_roles } @self_anon_supers),
+ (map{ $_->name } map{ $_->meta->calculate_all_roles } @other_anon_supers),
+ ;
+}
+
+
+sub find_method_by_name {
my($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;
$self->linearized_isa;
}
+sub find_attribute_by_name {
+ my($self, $name) = @_;
+ defined($name)
+ or $self->throw_error('You must define an attribute name to find');
+ foreach my $attr($self->get_all_attributes) {
+ return $attr if $attr->name eq $name;
+ }
+ return undef;
+}
+
sub add_attribute {
my $self = shift;
my($attr, $name);
- if(blessed $_[0]){
+ if(Scalar::Util::blessed($_[0])){
$attr = $_[0];
$attr->isa('Mouse::Meta::Attribute')
or $self->throw_error('You must provide a name for the attribute');
if ($name =~ s/^\+//) { # inherited attributes
- my $inherited_attr;
-
- foreach my $class($self->linearized_isa){
- my $meta = Mouse::Meta::Module::get_metaclass_by_name($class) or next;
- $inherited_attr = $meta->get_attribute($name) and last;
- }
-
- defined($inherited_attr)
+ 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 = $inherited_attr->clone_and_inherit_options($name, \%args);
+ $attr = $inherited_attr->clone_and_inherit_options(%args);
}
else{
- my($attribute_class, @traits) = Mouse::Meta::Attribute->interpolate_class($name, \%args);
+ my($attribute_class, @traits) = $self->attribute_metaclass->interpolate_class(\%args);
$args{traits} = \@traits if @traits;
- $attr = $attribute_class->new($name, \%args);
+ $attr = $attribute_class->new($name, %args);
}
}
- weaken( $attr->{associated_class} = $self );
+ Scalar::Util::weaken( $attr->{associated_class} = $self );
- $self->{attributes}{$attr->name} = $attr;
+ # install accessors first
$attr->install_accessors();
- if(_MOUSE_VERBOSE && !$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 { shift->get_all_attributes(@_) }
-sub get_all_attributes {
- my $self = shift;
- my (@attr, %seen);
+ # then register the attribute to the metaclass
+ $attr->{insertion_order} = keys %{ $self->{attributes} };
+ $self->{attributes}{$name} = $attr;
+ delete $self->{_mouse_cache}; # clears internal cache
- for my $class ($self->linearized_isa) {
- my $meta = $self->_metaclass_cache($class)
- or next;
-
- for my $name (keys %{ $meta->get_attribute_map }) {
- next if $seen{$name}++;
- push @attr, $meta->get_attribute($name);
- }
+ if(!$attr->{associated_methods} && ($attr->{is} || '') ne 'bare'){
+ Carp::carp(qq{Attribute ($name) of class }.$self->name
+ .qq{ has no associated methods (did you mean to provide an "is" argument?)});
}
-
- return @attr;
-}
-
-sub linearized_isa { @{ get_linear_isa($_[0]->name) } }
-
-sub new_object {
- my $self = shift;
- my %args = (@_ == 1 ? %{$_[0]} : @_);
-
- my $instance = bless {}, $self->name;
-
- $self->_initialize_instance($instance, \%args);
- return $instance;
+ return $attr;
}
-sub _initialize_instance{
- my($self, $instance, $args) = @_;
-
- my @triggers_queue;
-
- foreach my $attribute ($self->get_all_attributes) {
- my $from = $attribute->init_arg;
- my $key = $attribute->name;
-
- if (defined($from) && exists($args->{$from})) {
- $instance->{$key} = $attribute->_coerce_and_verify($args->{$from});
-
- weaken($instance->{$key})
- if ref($instance->{$key}) && $attribute->is_weak_ref;
-
- if ($attribute->has_trigger) {
- push @triggers_queue, [ $attribute->trigger, $instance->{$from} ];
- }
- }
- else {
- if ($attribute->has_default || $attribute->has_builder) {
- unless ($attribute->is_lazy) {
- my $default = $attribute->default;
- my $builder = $attribute->builder;
- my $value = $attribute->has_builder
- ? $instance->$builder
- : ref($default) eq 'CODE'
- ? $default->($instance)
- : $default;
-
- $value = $attribute->coerce_constraint($value)
- if $attribute->should_coerce;
- $attribute->verify_against_type_constraint($value);
-
- $instance->{$key} = $value;
-
- weaken($instance->{$key})
- if ref($instance->{$key}) && $attribute->is_weak_ref;
- }
- }
- else {
- if ($attribute->is_required) {
- $self->throw_error("Attribute (".$attribute->name.") is required");
- }
- }
- }
- }
-
- foreach my $trigger_and_value(@triggers_queue){
- my($trigger, $value) = @{$trigger_and_value};
- $trigger->($instance, $value);
- }
-
- if($self->is_anon_class){
- $instance->{__METACLASS__} = $self;
+sub _calculate_all_attributes {
+ my($self) = @_;
+ my %seen;
+ my @all_attrs;
+ foreach my $class($self->linearized_isa) {
+ my $meta = Mouse::Util::get_metaclass_by_name($class) or next;
+ my @attrs = grep { !$seen{$_->name}++ } values %{$meta->{attributes}};
+ @attrs = sort {
+ $b->{insertion_order} <=> $a->{insertion_order}
+ } @attrs;
+ push @all_attrs, @attrs;
}
-
- return $instance;
+ return [reverse @all_attrs];
}
-sub clone_object {
- my $class = shift;
- my $instance = shift;
- my %params = (@_ == 1) ? %{$_[0]} : @_;
+sub linearized_isa;
- (blessed($instance) && $instance->isa($class->name))
- || $class->throw_error("You must pass an instance of the metaclass (" . $class->name . "), not ($instance)");
+sub new_object;
+sub clone_object;
- my $clone = bless { %$instance }, ref $instance;
+sub immutable_options {
+ my ( $self, @args ) = @_;
- foreach my $attr ($class->get_all_attributes()) {
- if ( defined( my $init_arg = $attr->init_arg ) ) {
- if (exists $params{$init_arg}) {
- $clone->{ $attr->name } = $params{$init_arg};
- }
- }
- }
-
- return $clone;
-}
-
-sub clone_instance {
- my ($class, $instance, %params) = @_;
-
- Carp::cluck('clone_instance has been deprecated. Use clone_object instead')
- if _MOUSE_VERBOSE;
- return $class->clone_object($instance, %params);
+ return (
+ inline_constructor => 1,
+ inline_destructor => 1,
+ constructor_name => 'new',
+ @args,
+ );
}
sub make_immutable {
my $self = shift;
- my %args = (
- inline_constructor => 1,
- inline_destructor => 1,
- @_,
- );
+ my %args = $self->immutable_options(@_);
$self->{is_immutable}++;
if ($args{inline_constructor}) {
- $self->add_method('new' => Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self ));
+ $self->add_method($args{constructor_name} =>
+ Mouse::Util::load_class($self->constructor_class)
+ ->_generate_constructor($self, \%args));
}
if ($args{inline_destructor}) {
- $self->add_method('DESTROY' => Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self ));
+ $self->add_method(DESTROY =>
+ Mouse::Util::load_class($self->destructor_class)
+ ->_generate_destructor($self, \%args));
}
- # Moose's make_immutable returns true allowing calling code to skip setting an explicit true value
- # at the end of a source file.
+ # Moose's make_immutable returns true allowing calling code to skip
+ # setting an explicit true value at the end of a source file.
return 1;
}
-sub make_mutable { not_supported }
+sub make_mutable {
+ my($self) = @_;
+ $self->{is_immutable} = 0;
+ return;
+}
-sub is_immutable { $_[0]->{is_immutable} }
-sub is_mutable { !$_[0]->{is_immutable} }
+sub is_immutable;
+sub is_mutable { !$_[0]->is_immutable }
-sub _install_modifier_pp{
- my( $self, $into, $type, $name, $code ) = @_;
+sub _install_modifier {
+ 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");
+ or $self->throw_error("The method '$name' was not found in the inheritance hierarchy for $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->(@_) }
+ my(@before, @after, @around);
+ my $cache = $original;
+ my $modified = sub {
+ if(@before) {
+ for my $c (@before) { $c->(@_) }
+ }
+ unless(@after) {
+ return $cache->(@_);
+ }
if(wantarray){ # list context
my @rval = $cache->(@_);
return;
}
-sub _install_modifier {
- my ( $self, $into, $type, $name, $code ) = @_;
-
- # load Class::Method::Modifiers first
- my $no_cmm_fast = do{
- local $@;
- eval q{ require Class::Method::Modifiers::Fast };
- $@;
- };
-
- 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, $into, $type, $name, $code ) = @_;
- $install_modifier->(
- $into,
- $type,
- $name,
- $code
- );
- $self->{methods}{$name}++; # register it to the method map
- return;
- };
- }
-
- # replace this method itself :)
- {
- no warnings 'redefine';
- *_install_modifier = $impl;
- }
-
- $self->$impl( $into, $type, $name, $code );
-}
-
sub add_before_method_modifier {
my ( $self, $name, $code ) = @_;
- $self->_install_modifier( $self->name, 'before', $name, $code );
+ $self->_install_modifier( 'before', $name, $code );
}
sub add_around_method_modifier {
my ( $self, $name, $code ) = @_;
- $self->_install_modifier( $self->name, 'around', $name, $code );
+ $self->_install_modifier( 'around', $name, $code );
}
sub add_after_method_modifier {
my ( $self, $name, $code ) = @_;
- $self->_install_modifier( $self->name, 'after', $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 $body = $package->can($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 { $code->($package, $body, @_) });
+ $self->add_method($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 {
(defined $role_name)
|| $self->throw_error("You must supply a role name to look for");
+ $role_name = $role_name->name if ref $role_name;
+
for my $class ($self->linearized_isa) {
- my $meta = Mouse::Meta::Module::class_of($class);
- next unless $meta && $meta->can('roles');
+ my $meta = Mouse::Util::get_metaclass_by_name($class)
+ or next;
for my $role (@{ $meta->roles }) {
}
1;
-
__END__
=head1 NAME
Mouse::Meta::Class - The Mouse class metaclass
+=head1 VERSION
+
+This document describes Mouse version 0.76
+
+=head1 DESCRIPTION
+
+This class is a meta object protocol for Mouse classes,
+which is a subset of Moose::Meta:::Class.
+
=head1 METHODS
=head2 C<< initialize(ClassName) -> Mouse::Meta::Class >>
=head1 SEE ALSO
+L<Mouse::Meta::Module>
+
L<Moose::Meta::Class>
L<Class::MOP::Class>