X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FClass.pm;h=0e23430021da4b6af780e110e118757bc81e3def;hb=c12fb37bf5ea5c545ebb61d2fb031d414ddb73a2;hp=42f824e57f91d018a6b7908efc210905820f756b;hpb=66eea168570f52254def2675f86706336ab9bd8a;p=gitmo%2FMouse.git diff --git a/lib/Mouse/Meta/Class.pm b/lib/Mouse/Meta/Class.pm index 42f824e..0e23430 100644 --- a/lib/Mouse/Meta/Class.pm +++ b/lib/Mouse/Meta/Class.pm @@ -1,11 +1,12 @@ -#!/usr/bin/env perl package Mouse::Meta::Class; use strict; use warnings; -use Scalar::Util 'blessed'; - -use MRO::Compat; +use Mouse::Meta::Method::Constructor; +use Mouse::Meta::Method::Destructor; +use Scalar::Util qw/blessed weaken/; +use Mouse::Util qw/get_linear_isa version authority identifier/; +use Carp 'confess'; do { my %METACLASS_CACHE; @@ -19,23 +20,36 @@ do { } sub initialize { - my $class = shift; - my $name = shift; + my $class = blessed($_[0]) || $_[0]; + my $name = $_[1]; + $METACLASS_CACHE{$name} = $class->new(name => $name) if !exists($METACLASS_CACHE{$name}); return $METACLASS_CACHE{$name}; } + + # Means of accessing all the metaclasses that have + # been initialized thus far + sub get_all_metaclasses { %METACLASS_CACHE } + sub get_all_metaclass_instances { values %METACLASS_CACHE } + sub get_all_metaclass_names { keys %METACLASS_CACHE } + sub get_metaclass_by_name { $METACLASS_CACHE{$_[0]} } + sub store_metaclass_by_name { $METACLASS_CACHE{$_[0]} = $_[1] } + sub weaken_metaclass { weaken($METACLASS_CACHE{$_[0]}) } + sub does_metaclass_exist { exists $METACLASS_CACHE{$_[0]} && defined $METACLASS_CACHE{$_[0]} } + sub remove_metaclass_by_name { $METACLASS_CACHE{$_[0]} = undef } }; 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; } @@ -53,14 +67,88 @@ 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; +} + +sub has_method { + my $self = shift; + my $name = shift; + $self->name->can($name); +} + +# copied from Class::Inspector +my $get_methods_for_class = sub { + my $self = shift; + my $name = shift; + + no strict 'refs'; + # Get all the CODE symbol table entries + my @functions = + grep !/^(?:has|with|around|before|after|augment|inner|blessed|extends|confess|override|super)$/, + grep { defined &{"${name}::$_"} } + keys %{"${name}::"}; + push @functions, keys %{$self->{'methods'}->{$name}} if $self; + wantarray ? @functions : \@functions; +}; + +sub get_method_list { + my $self = shift; + $get_methods_for_class->($self, $self->name); +} + +sub get_all_method_names { + my $self = shift; + my %uniq; + return grep { $uniq{$_}++ == 0 } + map { $get_methods_for_class->(undef, $_) } + $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); @@ -80,8 +168,229 @@ sub compute_all_applicable_attributes { sub get_attribute_map { $_[0]->{attributes} } sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } sub get_attribute { $_[0]->{attributes}->{$_[1]} } +sub get_attribute_list { + my $self = shift; + keys %{$self->get_attribute_map}; +} + +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->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 make_immutable { + my $self = shift; + my %args = ( + inline_constructor => 1, + @_, + ); + + my $name = $self->name; + $self->{is_immutable}++; + + if ($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 { confess "Mouse does not currently support 'make_mutable'" } + +sub is_immutable { $_[0]->{is_immutable} } + +sub attribute_metaclass { "Mouse::Meta::Class" } -sub linearized_isa { @{ mro::get_linear_isa($_[0]->name) } } +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 strict 'refs'; + no warnings 'redefine'; + *{__PACKAGE__ . '::_install_modifier'} = sub { + my ( $self, $into, $type, $name, $code ) = @_; + $modifier->( + $into, + $type, + $name, + $code + ); + }; + } + + # 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 $pkg = $self->name; + my $method = "${pkg}::${name}"; + + # Class::Method::Modifiers won't do this for us, so do it ourselves + + my $body = $pkg->can($name) + or confess "You cannot override '$method' because it has no super method"; + + no strict 'refs'; + *$method = sub { $code->($pkg, $body, @_) }; +} + + +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 $class ($self->linearized_isa) { + next unless $class->can('meta') and $class->meta->can('roles'); + 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; @@ -110,12 +419,12 @@ 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. @@ -125,7 +434,13 @@ 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. @@ -137,5 +452,14 @@ 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