X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMouse.git;a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FClass.pm;h=2689f85a6f00eef44d854cdf2934a0fd618feda4;hp=8ecb8282e7268d317964bd70890fa3fcdd0472d9;hb=60b5c3be4d0b3bb705df1e8d977f2ce90db6668d;hpb=f7b11a21869769d2b49bba4fa72d33fa54ad0c2e diff --git a/lib/Mouse/Meta/Class.pm b/lib/Mouse/Meta/Class.pm index 8ecb828..2689f85 100644 --- a/lib/Mouse/Meta/Class.pm +++ b/lib/Mouse/Meta/Class.pm @@ -1,47 +1,32 @@ -#!/usr/bin/env perl package Mouse::Meta::Class; use strict; use warnings; -use Scalar::Util 'blessed'; -use Carp 'confess'; +use Mouse::Meta::Method::Constructor; +use Mouse::Meta::Method::Destructor; +use Scalar::Util qw/blessed weaken/; +use Mouse::Util qw/get_linear_isa not_supported/; -use MRO::Compat; +use base qw(Mouse::Meta::Module); -do { - my %METACLASS_CACHE; +sub method_metaclass(){ 'Mouse::Meta::Method' } # required for get_method() - # 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 { + my($class, %args) = @_; -sub new { - my $class = shift; - my %args = @_; + $args{attributes} ||= {}; + $args{methods} ||= {}; + $args{roles} ||= []; - $args{attributes} = {}; $args{superclasses} = do { no strict 'refs'; - \@{ $args{name} . '::ISA' }; + \@{ $args{package} . '::ISA' }; }; bless \%args, $class; } -sub name { $_[0]->{name} } +sub roles { $_[0]->{roles} } sub superclasses { my $self = shift; @@ -54,14 +39,49 @@ sub superclasses { @{ $self->{superclasses} }; } +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 add_attribute { my $self = shift; - my $attr = shift; - $self->{'attributes'}{$attr->name} = $attr; + if (@_ == 1 && blessed($_[0])) { + my $attr = shift @_; + $self->{'attributes'}{$attr->name} = $attr; + } else { + my $names = shift @_; + $names = [$names] if !ref($names); + my $metaclass = 'Mouse::Meta::Attribute'; + my %options = @_; + + if ( my $metaclass_name = delete $options{metaclass} ) { + my $new_class = Mouse::Util::resolve_metaclass_alias( + 'Attribute', + $metaclass_name + ); + if ( $metaclass ne $new_class ) { + $metaclass = $new_class; + } + } + + for my $name (@$names) { + if ($name =~ s/^\+//) { + $metaclass->clone_parent($self, $name, @_); + } + else { + $metaclass->create($self, $name, @_); + } + } + } } -sub compute_all_applicable_attributes { +sub compute_all_applicable_attributes { shift->get_all_attributes(@_) } +sub get_all_attributes { my $self = shift; my (@attr, %seen); @@ -78,18 +98,69 @@ sub compute_all_applicable_attributes { return @attr; } -sub get_attribute_map { $_[0]->{attributes} } -sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } -sub get_attribute { $_[0]->{attributes}->{$_[1]} } +sub linearized_isa { @{ get_linear_isa($_[0]->name) } } -sub linearized_isa { @{ mro::get_linear_isa($_[0]->name) } } +sub new_object { + my $self = shift; + my $args = (@_ == 1) ? $_[0] : { @_ }; + + my $instance = bless {}, $self->name; + + foreach my $attribute ($self->get_all_attributes) { + my $from = $attribute->init_arg; + my $key = $attribute->name; + + if (defined($from) && exists($args->{$from})) { + $args->{$from} = $attribute->coerce_constraint($args->{$from}) + if $attribute->should_coerce; + $attribute->verify_against_type_constraint($args->{$from}); + + $instance->{$key} = $args->{$from}; + + weaken($instance->{$key}) + if ref($instance->{$key}) && $attribute->is_weak_ref; + + if ($attribute->has_trigger) { + $attribute->trigger->($instance, $args->{$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"); + } + } + } + } + return $instance; +} sub clone_object { my $class = shift; my $instance = shift; (blessed($instance) && $instance->isa($class->name)) - || confess "You must pass an instance ($instance) of the metaclass (" . $class->name . ")"; + || $class->throw_error("You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"); $class->clone_instance($instance, @_); } @@ -98,11 +169,11 @@ sub clone_instance { my ($class, $instance, %params) = @_; (blessed($instance)) - || confess "You can only clone instances, \$self is not a blessed instance"; + || $class->throw_error("You can only clone instances, ($instance) is not a blessed instance"); my $clone = bless { %$instance }, ref $instance; - foreach my $attr ($class->compute_all_applicable_attributes()) { + 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}; @@ -114,6 +185,240 @@ sub clone_instance { } +sub make_immutable { + my $self = shift; + my %args = ( + inline_constructor => 1, + inline_destructor => 1, + @_, + ); + + $self->{is_immutable}++; + + if ($args{inline_constructor}) { + $self->add_method('new' => Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self )); + } + + if ($args{inline_destructor}) { + $self->add_method('DESTROY' => Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self )); + } + + # 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 is_immutable { $_[0]->{is_immutable} } +sub is_mutable { !$_[0]->{is_immutable} } + +sub _install_modifier { + my ( $self, $into, $type, $name, $code ) = @_; + + # which is modifer class available? + my $modifier_class = do { + if (eval "require Class::Method::Modifiers::Fast; 1") { + 'Class::Method::Modifiers::Fast'; + } elsif (eval "require Class::Method::Modifiers; 1") { + 'Class::Method::Modifiers'; + } else { + Carp::croak("Method modifiers require the use of Class::Method::Modifiers or Class::Method::Modifiers::Fast. Please install it from CPAN and file a bug report with this application."); + } + }; + my $modifier = $modifier_class->can('_install_modifier'); + + # replace this method itself :) + { + no warnings 'redefine'; + *_install_modifier = sub { + my ( $self, $into, $type, $name, $code ) = @_; + $modifier->( + $into, + $type, + $name, + $code + ); + $self->{methods}{$name}++; # register it to the method map + return; + }; + } + + # call me. for first time. + $self->_install_modifier( $into, $type, $name, $code ); +} + +sub add_before_method_modifier { + my ( $self, $name, $code ) = @_; + $self->_install_modifier( $self->name, 'before', $name, $code ); +} + +sub add_around_method_modifier { + my ( $self, $name, $code ) = @_; + $self->_install_modifier( $self->name, 'around', $name, $code ); +} + +sub add_after_method_modifier { + my ( $self, $name, $code ) = @_; + $self->_install_modifier( $self->name, 'after', $name, $code ); +} + +sub add_override_method_modifier { + my ($self, $name, $code) = @_; + + my $package = $self->name; + + my $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, $body, @_) }); +} + +sub does_role { + my ($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 $meta = Mouse::Meta::Module::class_of($class); + next unless $meta && $meta->can('roles'); + + for my $role (@{ $meta->roles }) { + + return 1 if $role->does_role($role_name); + } + } + + return 0; +} + +sub create { + my ($class, $package_name, %options) = @_; + + (ref $options{superclasses} eq 'ARRAY') + || $class->throw_error("You must pass an ARRAY ref of superclasses") + if exists $options{superclasses}; + + (ref $options{attributes} eq 'ARRAY') + || $class->throw_error("You must pass an ARRAY ref of attributes") + if exists $options{attributes}; + + (ref $options{methods} eq 'HASH') + || $class->throw_error("You must pass a HASH ref of methods") + if exists $options{methods}; + + (ref $options{roles} eq 'ARRAY') + || $class->throw_error("You must pass an ARRAY ref of roles") + if exists $options{roles}; + + # instantiate a module + { + ( defined $package_name && $package_name ) + || $class->throw_error("You must pass a package name"); + + no strict 'refs'; + ${ $package_name . '::VERSION' } = $options{version} if exists $options{version}; + ${ $package_name . '::AUTHORITY' } = $options{authority} if exists $options{authority}; + } + + my %initialize_options = %options; + delete @initialize_options{qw( + package + superclasses + attributes + methods + roles + version + authority + )}; + my $meta = $class->initialize( $package_name => %initialize_options ); + + # FIXME totally lame + $meta->add_method('meta' => sub { + Mouse::Meta::Class->initialize(ref($_[0]) || $_[0]); + }); + + $meta->superclasses(@{$options{superclasses}}) + if exists $options{superclasses}; + + # NOTE: + # process attributes first, so that they can + # install accessors, but locally defined methods + # can then overwrite them. It is maybe a little odd, but + # I think this should be the order of things. + if (exists $options{attributes}) { + foreach my $attr (@{$options{attributes}}) { + Mouse::Meta::Attribute->create($meta, $attr->{name}, %$attr); + } + } + if (exists $options{methods}) { + foreach my $method_name (keys %{$options{methods}}) { + $meta->add_method($method_name, $options{methods}->{$method_name}); + } + } + if (exists $options{roles}){ + Mouse::Util::apply_all_roles($package_name, @{$options{roles}}); + } + return $meta; +} + +{ + my $ANON_CLASS_SERIAL = 0; + my $ANON_CLASS_PREFIX = 'Mouse::Meta::Class::__ANON__::SERIAL::'; + + my %IMMORTAL_ANON_CLASSES; + sub create_anon_class { + my ( $class, %options ) = @_; + + my $cache = $options{cache}; + my $cache_key; + + if($cache){ # anonymous but not mortal + # something like Super::Class|Super::Class::2=Role|Role::1 + $cache_key = join '=' => ( + join('|', @{$options{superclasses} || []}), + join('|', sort @{$options{roles} || []}), + ); + return $IMMORTAL_ANON_CLASSES{$cache_key} if exists $IMMORTAL_ANON_CLASSES{$cache_key}; + } + my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL; + my $meta = $class->create( $package_name, anon_class_id => $ANON_CLASS_SERIAL, %options ); + + if($cache){ + $IMMORTAL_ANON_CLASSES{$cache_key} = $meta; + } + else{ + Mouse::Meta::Module::weaken_metaclass($package_name); + } + return $meta; + } + + sub is_anon_class{ + return exists $_[0]->{anon_class_id}; + } + + + sub DESTROY{ + my($self) = @_; + + my $serial_id = $self->{anon_class_id}; + + return if !$serial_id; + + my $stash = $self->namespace; + + @{$self->{sperclasses}} = (); + %{$stash} = (); + Mouse::Meta::Module::remove_metaclass_by_name($self->name); + + no strict 'refs'; + delete ${$ANON_CLASS_PREFIX}{ $serial_id . '::' }; + + return; + } + +} 1; @@ -142,12 +447,12 @@ Returns the name of the owner class. Gets (or sets) the list of superclasses of the owner class. -=head2 add_attribute Mouse::Meta::Attribute +=head2 add_attribute (Mouse::Meta::Attribute| name => spec) Begins keeping track of the existing L for the owner class. -=head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute) +=head2 get_all_attributes -> (Mouse::Meta::Attribute) Returns the list of all L instances associated with this class and its superclasses. @@ -157,7 +462,13 @@ this class and its superclasses. Returns a mapping of attribute names to their corresponding L objects. -=head2 has_attribute Name -> Boool +=head2 get_attribute_list -> { name => Mouse::Meta::Attribute } + +This 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 method. + +=head2 has_attribute Name -> Bool Returns whether we have a L with the given name. @@ -176,7 +487,8 @@ metaclass. =head2 clone_instance Instance, Parameters -> Instance -Clones the given C and sets any additional parameters. +The clone_instance method has been made private. +The public version is deprecated. =cut