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=afe92940c085a385a7861c6cd2aecb6796889a8d;hp=ea7c8960c99d0888a239e76790c0bf54248070b2;hb=815f725aeff0bd44da8d75e7cd4ac456e9e60238;hpb=306290e864ac23e5f1692c8495b0c173081a1ebb diff --git a/lib/Mouse/Meta/Class.pm b/lib/Mouse/Meta/Class.pm index ea7c896..afe9294 100644 --- a/lib/Mouse/Meta/Class.pm +++ b/lib/Mouse/Meta/Class.pm @@ -1,12 +1,24 @@ -#!/usr/bin/env perl package Mouse::Meta::Class; use strict; use warnings; -use MRO::Compat; +use Mouse::Meta::Method::Constructor; +use Mouse::Meta::Method::Destructor; +use Scalar::Util qw/blessed/; +use Mouse::Util qw/get_linear_isa/; +use Carp 'confess'; do { my %METACLASS_CACHE; + + # 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; @@ -18,13 +30,14 @@ do { sub new { my $class = shift; - my %args = @_; + my %args = @_; $args{attributes} = {}; $args{superclasses} = do { no strict 'refs'; \@{ $args{name} . '::ISA' }; }; + $args{roles} ||= []; bless \%args, $class; } @@ -42,6 +55,34 @@ sub superclasses { @{ $self->{superclasses} }; } +sub add_method { + my $self = shift; + my $name = shift; + my $code = shift; + + my $pkg = $self->name; + + no strict 'refs'; + no warnings 'redefine'; + $self->{'methods'}->{$name}++; # Moose stores meta object here. + *{ $pkg . '::' . $name } = $code; +} + +# copied from Class::Inspector +sub get_method_list { + my $self = shift; + my $name = $self->name; + + no strict 'refs'; + # Get all the CODE symbol table entries + my @functions = + grep !/^(?:has|with|around|before|after|blessed|extends|confess)$/, + grep { defined &{"${name}::$_"} } + keys %{"${name}::"}; + push @functions, keys %{$self->{'methods'}->{$name}}; + wantarray ? @functions : \@functions; +} + sub add_attribute { my $self = shift; my $attr = shift; @@ -49,10 +90,201 @@ sub add_attribute { $self->{'attributes'}{$attr->name} = $attr; } +sub compute_all_applicable_attributes { + my $self = shift; + my (@attr, %seen); + + 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); + } + } + + return @attr; +} + 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($_[0]->name) } } +sub linearized_isa { @{ get_linear_isa($_[0]->name) } } + +sub clone_object { + my $class = shift; + my $instance = shift; + + (blessed($instance) && $instance->isa($class->name)) + || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"; + + $class->clone_instance($instance, @_); +} + +sub clone_instance { + my ($class, $instance, %params) = @_; + + (blessed($instance)) + || confess "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()) { + if ( defined( my $init_arg = $attr->init_arg ) ) { + if (exists $params{$init_arg}) { + $clone->{ $attr->name } = $params{$init_arg}; + } + } + } + + return $clone; + +} + +sub make_immutable { + my $self = shift; + my %args = @_; + my $name = $self->name; + $self->{is_immutable}++; + $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 )); + } +} + +sub make_mutable { confess "Mouse does not currently support 'make_mutable'" } + +sub is_immutable { $_[0]->{is_immutable} } + +sub attribute_metaclass { "Mouse::Meta::Class" } + +sub _install_modifier { + my ( $self, $into, $type, $name, $code ) = @_; + if (eval "require Class::Method::Modifiers::Fast; 1") { + Class::Method::Modifiers::Fast::_install_modifier( + $into, + $type, + $name, + $code + ); + } + else { + require Class::Method::Modifiers; + Class::Method::Modifiers::_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 roles { $_[0]->{roles} } + +sub does_role { + my ($self, $role_name) = @_; + + (defined $role_name) + || confess "You must supply a role name to look for"; + + for my $role (@{ $self->{roles} }) { + return 1 if $role->name eq $role_name; + } + + return 0; +} + +sub create { + my ($self, $package_name, %options) = @_; + + (ref $options{superclasses} eq 'ARRAY') + || confess "You must pass an ARRAY ref of superclasses" + if exists $options{superclasses}; + + (ref $options{attributes} eq 'ARRAY') + || confess "You must pass an ARRAY ref of attributes" + if exists $options{attributes}; + + (ref $options{methods} eq 'HASH') + || confess "You must pass a HASH ref of methods" + if exists $options{methods}; + + do { + ( defined $package_name && $package_name ) + || confess "You must pass a package name"; + + my $code = "package $package_name;"; + $code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';" + if exists $options{version}; + $code .= "\$$package_name\:\:AUTHORITY = '" . $options{authority} . "';" + if exists $options{authority}; + + eval $code; + confess "creation of $package_name failed : $@" if $@; + }; + + my %initialize_options = %options; + delete @initialize_options{qw( + package + superclasses + attributes + methods + version + authority + )}; + my $meta = $self->initialize( $package_name => %initialize_options ); + + # FIXME totally lame + $meta->add_method('meta' => sub { + $self->initialize(ref($_[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}); + } + } + return $meta; +} + +{ + my $ANON_CLASS_SERIAL = 0; + my $ANON_CLASS_PREFIX = 'Mouse::Meta::Class::__ANON__::SERIAL::'; + sub create_anon_class { + my ( $class, %options ) = @_; + my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL; + return $class->create( $package_name, %options ); + } +} 1; @@ -86,11 +318,20 @@ Gets (or sets) the list of superclasses of the owner class. Begins keeping track of the existing L for the owner class. +=head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute) + +Returns the list of all L instances associated with +this class and its superclasses. + =head2 get_attribute_map -> { name => Mouse::Meta::Attribute } Returns a mapping of attribute names to their corresponding L objects. +=head2 has_attribute Name -> Bool + +Returns whether we have a L with the given name. + =head2 get_attribute Name -> Mouse::Meta::Attribute | undef Returns the L with the given name. @@ -99,5 +340,14 @@ Returns the L with the given name. Returns the list of classes in method dispatch order, with duplicates removed. +=head2 clone_object Instance -> Instance + +Clones the given C which must be an instance governed by this +metaclass. + +=head2 clone_instance Instance, Parameters -> Instance + +Clones the given C and sets any additional parameters. + =cut