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=7b03c6f6104833ac99a5cc6f423ed237235bf49f;hp=42f824e57f91d018a6b7908efc210905820f756b;hb=e128626c409797822ffd8a4079f833eb3dc0fd37;hpb=66eea168570f52254def2675f86706336ab9bd8a diff --git a/lib/Mouse/Meta/Class.pm b/lib/Mouse/Meta/Class.pm index 42f824e..7b03c6f 100644 --- a/lib/Mouse/Meta/Class.pm +++ b/lib/Mouse/Meta/Class.pm @@ -1,141 +1,558 @@ -#!/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 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 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 method. + +=head2 C<< get_all_methods -> (Mouse::Meta::Method) >> + +Return the list of all L instances associated with +the class and its superclasses. + +=head2 C<< add_attribute(name => spec | Mouse::Meta::Attribute) >> Begins keeping track of the existing L for the owner class. -=head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute) +=head2 C<< has_attribute(Name) -> Bool >> + +Returns whether we have a L with the given name. + +=head2 C<< get_attribute Name -> Mouse::Meta::Attribute | undef >> + +Returns the L 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 method. + +=head2 C<< get_all_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 } +=head2 C<< linearized_isa -> [ClassNames] >> -Returns a mapping of attribute names to their corresponding -L 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 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 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 + +L + +L =cut