use Class::MOP;
-use Carp 'confess';
+use Carp ();
+use List::Util qw( first );
+use List::MoreUtils qw( any all uniq );
use Scalar::Util 'weaken', 'blessed';
-our $VERSION = '0.55_01';
+our $VERSION = '0.67';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
use Moose::Meta::Method::Overriden;
use Moose::Meta::Method::Augmented;
+use Moose::Error::Default;
use base 'Class::MOP::Class';
default => sub { [] }
));
+__PACKAGE__->meta->add_attribute('constructor_class' => (
+ accessor => 'constructor_class',
+ default => 'Moose::Meta::Method::Constructor',
+));
+
+__PACKAGE__->meta->add_attribute('destructor_class' => (
+ accessor => 'destructor_class',
+ default => 'Moose::Meta::Method::Destructor',
+));
+
+__PACKAGE__->meta->add_attribute('error_class' => (
+ accessor => 'error_class',
+ default => 'Moose::Error::Default',
+));
+
+
sub initialize {
my $class = shift;
my $pkg = shift;
my ($self, $package_name, %options) = @_;
(ref $options{roles} eq 'ARRAY')
- || confess "You must pass an ARRAY ref of roles"
+ || $self->throw_error("You must pass an ARRAY ref of roles", data => $options{roles})
if exists $options{roles};
-
+ my $roles = delete $options{roles};
+
my $class = $self->SUPER::create($package_name, %options);
-
- if (exists $options{roles}) {
- Moose::Util::apply_all_roles($class, @{$options{roles}});
+
+ if ($roles) {
+ Moose::Util::apply_all_roles( $class, @$roles );
}
return $class;
}
+sub check_metaclass_compatibility {
+ my $self = shift;
+
+ if ( my @supers = $self->superclasses ) {
+ $self->_fix_metaclass_incompatibility(@supers);
+ }
+
+ $self->SUPER::check_metaclass_compatibility(@_);
+}
+
my %ANON_CLASSES;
sub create_anon_class {
# something like Super::Class|Super::Class::2=Role|Role::1
my $cache_key = join '=' => (
- join('|', sort @{$options{superclasses} || []}),
- join('|', sort @{$options{roles} || []}),
+ join('|', @{$options{superclasses} || []}),
+ join('|', sort @{$options{roles} || []}),
);
if ($cache_ok && defined $ANON_CLASSES{$cache_key}) {
sub add_role {
my ($self, $role) = @_;
(blessed($role) && $role->isa('Moose::Meta::Role'))
- || confess "Roles must be instances of Moose::Meta::Role";
+ || $self->throw_error("Roles must be instances of Moose::Meta::Role", data => $role);
push @{$self->roles} => $role;
}
sub does_role {
my ($self, $role_name) = @_;
(defined $role_name)
- || confess "You must supply a role name to look for";
+ || $self->throw_error("You must supply a role name to look for");
foreach my $class ($self->class_precedence_list) {
next unless $class->can('meta') && $class->meta->can('roles');
foreach my $role (@{$class->meta->roles}) {
sub excludes_role {
my ($self, $role_name) = @_;
(defined $role_name)
- || confess "You must supply a role name to look for";
+ || $self->throw_error("You must supply a role name to look for");
foreach my $class ($self->class_precedence_list) {
next unless $class->can('meta');
# NOTE:
}
sub new_object {
- my $class = shift;
+ my $class = shift;
my $params = @_ == 1 ? $_[0] : {@_};
- my $self = $class->SUPER::new_object($params);
- foreach my $attr ($class->compute_all_applicable_attributes()) {
- # if we have a trigger, then ...
- if ($attr->can('has_trigger') && $attr->has_trigger) {
- # make sure we have an init-arg ...
- if (defined(my $init_arg = $attr->init_arg)) {
- # now make sure an init-arg was passes ...
- if (exists $params->{$init_arg}) {
- # and if get here, fire the trigger
- $attr->trigger->(
- $self,
- # check if there is a coercion
- ($attr->should_coerce
- # and if so, we need to grab the
- # value that is actually been stored
- ? $attr->get_read_method_ref->($self)
- # otherwise, just get the value from
- # the constructor params
- : $params->{$init_arg}),
- $attr
- );
- }
- }
- }
+ my $self = $class->SUPER::new_object($params);
+
+ foreach my $attr ( $class->compute_all_applicable_attributes() ) {
+
+ next unless $attr->can('has_trigger') && $attr->has_trigger;
+
+ my $init_arg = $attr->init_arg;
+
+ next unless defined $init_arg;
+
+ next unless exists $params->{$init_arg};
+
+ $attr->trigger->(
+ $self,
+ (
+ $attr->should_coerce
+ ? $attr->get_read_method_ref->($self)
+ : $params->{$init_arg}
+ ),
+ $attr
+ );
}
+
return $self;
}
return $instance;
}
-# FIXME:
-# This is ugly
-sub get_method_map {
- my $self = shift;
-
- my $current = Class::MOP::check_package_cache_flag($self->name);
-
- if (defined $self->{'_package_cache_flag'} && $self->{'_package_cache_flag'} == $current) {
- return $self->{'methods'};
- }
-
- $self->{_package_cache_flag} = $current;
-
- my $map = $self->{'methods'};
-
- my $class_name = $self->name;
- my $method_metaclass = $self->method_metaclass;
-
- my %all_code = $self->get_all_package_symbols('CODE');
-
- foreach my $symbol (keys %all_code) {
- my $code = $all_code{$symbol};
-
- next if exists $map->{$symbol} &&
- defined $map->{$symbol} &&
- $map->{$symbol}->body == $code;
-
- my ($pkg, $name) = Class::MOP::get_code_info($code);
-
- if ($pkg->can('meta')
- # NOTE:
- # we don't know what ->meta we are calling
- # here, so we need to be careful cause it
- # just might blow up at us, or just complain
- # loudly (in the case of Curses.pm) so we
- # just be a little overly cautious here.
- # - SL
- && eval { no warnings; blessed($pkg->meta) }
- && $pkg->meta->isa('Moose::Meta::Role')) {
- #my $role = $pkg->meta->name;
- #next unless $self->does_role($role);
- }
- else {
-
- # NOTE:
- # in 5.10 constant.pm the constants show up
- # as being in the right package, but in pre-5.10
- # they show up as constant::__ANON__ so we
- # make an exception here to be sure that things
- # work as expected in both.
- # - SL
- unless ($pkg eq 'constant' && $name eq '__ANON__') {
- next if ($pkg || '') ne $class_name ||
- (($name || '') ne '__ANON__' && ($pkg || '') ne $class_name);
- }
-
- }
-
- $map->{$symbol} = $method_metaclass->wrap(
- $code,
- package_name => $class_name,
- name => $symbol
- );
- }
-
- return $map;
-}
-
### ---------------------------------------------
sub add_attribute {
my ($self, $name, $method, $_super_package) = @_;
(!$self->has_method($name))
- || confess "Cannot add an override method if a local method is already present";
+ || $self->throw_error("Cannot add an override method if a local method is already present");
$self->add_method($name => Moose::Meta::Method::Overriden->new(
method => $method,
sub add_augment_method_modifier {
my ($self, $name, $method) = @_;
(!$self->has_method($name))
- || confess "Cannot add an augment method if a local method is already present";
+ || $self->throw_error("Cannot add an augment method if a local method is already present");
$self->add_method($name => Moose::Meta::Method::Augmented->new(
method => $method,
return undef;
}
-sub _fix_metaclass_incompatability {
+sub _fix_metaclass_incompatibility {
my ($self, @superclasses) = @_;
+
foreach my $super (@superclasses) {
- # don't bother if it does not have a meta.
- my $meta = Class::MOP::Class->initialize($super) or next;
- next unless $meta->isa("Class::MOP::Class");
-
- # get the name, make sure we take
- # immutable classes into account
- my $super_meta_name = ($meta->is_immutable
- ? $meta->get_mutable_metaclass_name
- : ref($meta));
-
- # but if we have anything else,
- # we need to check it out ...
- unless (# see if of our metaclass is incompatible
- $self->isa($super_meta_name)
- and
- # and see if our instance metaclass is incompatible
- $self->instance_metaclass->isa($meta->instance_metaclass)
- ) {
- if ( $meta->isa(ref($self)) ) {
- unless ( $self->is_pristine ) {
- confess "Not reinitializing metaclass for " . $self->name . ", it isn't pristine";
- }
- # also check values %{ $self->get_method_map } for any generated methods
-
- # NOTE:
- # We might want to consider actually
- # transfering any attributes from the
- # original meta into this one, but in
- # general you should not have any there
- # at this point anyway, so it's very
- # much an obscure edge case anyway
- $self = $meta->reinitialize(
- $self->name,
- attribute_metaclass => $meta->attribute_metaclass,
- method_metaclass => $meta->method_metaclass,
- instance_metaclass => $meta->instance_metaclass,
- );
- } else {
- # this will be called soon enough, for now we let it slide
- # $self->check_metaclass_compatability()
- }
+ next if $self->_superclass_meta_is_compatible($super);
+
+ unless ( $self->is_pristine ) {
+ $self->throw_error(
+ "Cannot attempt to reinitialize metaclass for "
+ . $self->name
+ . ", it isn't pristine" );
}
+
+ $self->_reconcile_with_superclass_meta($super);
+ }
+}
+
+sub _superclass_meta_is_compatible {
+ my ($self, $super) = @_;
+
+ my $super_meta = Class::MOP::Class->initialize($super)
+ or return 1;
+
+ next unless $super_meta->isa("Class::MOP::Class");
+
+ my $super_meta_name
+ = $super_meta->is_immutable
+ ? $super_meta->get_mutable_metaclass_name
+ : ref($super_meta);
+
+ return 1
+ if $self->isa($super_meta_name)
+ and
+ $self->instance_metaclass->isa( $super_meta->instance_metaclass );
+}
+
+# I don't want to have to type this >1 time
+my @MetaClassTypes =
+ qw( attribute_metaclass method_metaclass instance_metaclass
+ constructor_class destructor_class error_class );
+
+sub _reconcile_with_superclass_meta {
+ my ($self, $super) = @_;
+
+ my $super_meta = $super->meta;
+
+ my $super_meta_name
+ = $super_meta->is_immutable
+ ? $super_meta->get_mutable_metaclass_name
+ : ref($super_meta);
+
+ my $self_metaclass = ref $self;
+
+ # If neither of these is true we have a more serious
+ # incompatibility that we just cannot fix (yet?).
+ if ( $super_meta_name->isa( ref $self )
+ && all { $super_meta->$_->isa( $self->$_ ) } @MetaClassTypes ) {
+ $self->_reinitialize_with($super_meta);
+ }
+ elsif ( $self->_all_metaclasses_differ_by_roles_only($super_meta) ) {
+ $self->_reconcile_role_differences($super_meta);
+ }
+}
+
+sub _reinitialize_with {
+ my ( $self, $new_meta ) = @_;
+
+ my $new_self = $new_meta->reinitialize(
+ $self->name,
+ attribute_metaclass => $new_meta->attribute_metaclass,
+ method_metaclass => $new_meta->method_metaclass,
+ instance_metaclass => $new_meta->instance_metaclass,
+ );
+
+ $new_self->$_( $new_meta->$_ )
+ for qw( constructor_class destructor_class error_class );
+
+ %$self = %$new_self;
+
+ bless $self, ref $new_self;
+
+ # We need to replace the cached metaclass instance or else when it
+ # goes out of scope Class::MOP::Class destroy's the namespace for
+ # the metaclass's class, causing much havoc.
+ Class::MOP::store_metaclass_by_name( $self->name, $self );
+ Class::MOP::weaken_metaclass( $self->name ) if $self->is_anon_class;
+}
+
+# In the more complex case, we share a common ancestor with our
+# superclass's metaclass, but each metaclass (ours and the parent's)
+# has a different set of roles applied. We reconcile this by first
+# reinitializing into the parent class, and _then_ applying our own
+# roles.
+sub _all_metaclasses_differ_by_roles_only {
+ my ($self, $super_meta) = @_;
+
+ for my $pair (
+ [ ref $self, ref $super_meta ],
+ map { [ $self->$_, $super_meta->$_ ] } @MetaClassTypes
+ ) {
+
+ next if $pair->[0] eq $pair->[1];
+
+ my $self_meta_meta = Class::MOP::Class->initialize( $pair->[0] );
+ my $super_meta_meta = Class::MOP::Class->initialize( $pair->[1] );
+
+ my $common_ancestor
+ = _find_common_ancestor( $self_meta_meta, $super_meta_meta );
+
+ return unless $common_ancestor;
+
+ return
+ unless _is_role_only_subclass_of(
+ $self_meta_meta,
+ $common_ancestor,
+ )
+ && _is_role_only_subclass_of(
+ $super_meta_meta,
+ $common_ancestor,
+ );
+ }
+
+ return 1;
+}
+
+# This, and some other functions, could be called as methods, but
+# they're not for two reasons. One, we just end up ignoring the first
+# argument, because we can't call these directly on one of the real
+# arguments, because one of them could be a Class::MOP::Class object
+# and not a Moose::Meta::Class. Second, only a completely insane
+# person would attempt to subclass this stuff!
+sub _find_common_ancestor {
+ my ($meta1, $meta2) = @_;
+
+ # FIXME? This doesn't account for multiple inheritance (not sure
+ # if it needs to though). For example, is somewhere in $meta1's
+ # history it inherits from both ClassA and ClassB, and $meta
+ # inherits from ClassB & ClassA, does it matter? And what crazy
+ # fool would do that anyway?
+
+ my %meta1_parents = map { $_ => 1 } $meta1->linearized_isa;
+
+ return first { $meta1_parents{$_} } $meta2->linearized_isa;
+}
+
+sub _is_role_only_subclass_of {
+ my ($meta, $ancestor) = @_;
+
+ return 1 if $meta->name eq $ancestor;
+
+ my @roles = _all_roles_until( $meta, $ancestor );
+
+ my %role_packages = map { $_->name => 1 } @roles;
+
+ my $ancestor_meta = Class::MOP::Class->initialize($ancestor);
+
+ my %shared_ancestors = map { $_ => 1 } $ancestor_meta->linearized_isa;
+
+ for my $method ( $meta->get_all_methods() ) {
+ next if $method->name eq 'meta';
+ next if $method->can('associated_attribute');
+
+ next
+ if $role_packages{ $method->original_package_name }
+ || $shared_ancestors{ $method->original_package_name };
+
+ return 0;
+ }
+
+ # FIXME - this really isn't right. Just because an attribute is
+ # defined in a role doesn't mean it isn't _also_ defined in the
+ # subclass.
+ for my $attr ( $meta->get_all_attributes ) {
+ next if $shared_ancestors{ $attr->associated_class->name };
+
+ next if any { $_->has_attribute( $attr->name ) } @roles;
+
+ return 0;
+ }
+
+ return 1;
+}
+
+sub _all_roles {
+ my $meta = shift;
+
+ return _all_roles_until($meta);
+}
+
+sub _all_roles_until {
+ my ($meta, $stop_at_class) = @_;
+
+ return unless $meta->can('calculate_all_roles');
+
+ my @roles = $meta->calculate_all_roles;
+
+ for my $class ( $meta->linearized_isa ) {
+ last if $stop_at_class && $stop_at_class eq $class;
+
+ my $meta = Class::MOP::Class->initialize($class);
+ last unless $meta->can('calculate_all_roles');
+
+ push @roles, $meta->calculate_all_roles;
+ }
+
+ return uniq @roles;
+}
+
+sub _reconcile_role_differences {
+ my ($self, $super_meta) = @_;
+
+ my $self_meta = $self->meta;
+
+ my %roles;
+
+ if ( my @roles = map { $_->name } _all_roles($self_meta) ) {
+ $roles{metaclass_roles} = \@roles;
}
+
+ for my $thing (@MetaClassTypes) {
+ my $name = $self->$thing();
+
+ my $thing_meta = Class::MOP::Class->initialize($name);
+
+ my @roles = map { $_->name } _all_roles($thing_meta)
+ or next;
+
+ $roles{ $thing . '_roles' } = \@roles;
+ }
+
+ $self->_reinitialize_with($super_meta);
+
+ Moose::Util::MetaRole::apply_metaclass_roles(
+ for_class => $self->name,
+ %roles,
+ );
+
return $self;
}
@args = %{$args[0]} if scalar @args == 1 && ref($args[0]) eq 'HASH';
- if ($name =~ /^\+(.*)/) {
+ if (($name || '') =~ /^\+(.*)/) {
return $self->_process_inherited_attribute($1, @args);
}
else {
my ($self, $attr_name, %options) = @_;
my $inherited_attr = $self->find_attribute_by_name($attr_name);
(defined $inherited_attr)
- || confess "Could not find an attribute by the name of '$attr_name' to inherit from";
+ || $self->throw_error("Could not find an attribute by the name of '$attr_name' to inherit from in ${\$self->name}", data => $attr_name);
if ($inherited_attr->isa('Moose::Meta::Attribute')) {
return $inherited_attr->clone_and_inherit_options(%options);
}
wrapped => {
add_package_symbol => sub {
my $original = shift;
- confess "Cannot add package symbols to an immutable metaclass"
+ $self->throw_error("Cannot add package symbols to an immutable metaclass")
unless (caller(2))[3] eq 'Class::MOP::Package::get_package_symbol';
goto $original->body;
},
my $self = shift;
$self->SUPER::make_immutable
(
- constructor_class => 'Moose::Meta::Method::Constructor',
- destructor_class => 'Moose::Meta::Method::Destructor',
+ constructor_class => $self->constructor_class,
+ destructor_class => $self->destructor_class,
inline_destructor => 1,
# NOTE:
# no need to do this,
);
}
+our $error_level;
+
+sub throw_error {
+ my ( $self, @args ) = @_;
+ local $error_level = ($error_level || 0) + 1;
+ $self->raise_error($self->create_error(@args));
+}
+
+sub raise_error {
+ my ( $self, @args ) = @_;
+ die @args;
+}
+
+sub create_error {
+ my ( $self, @args ) = @_;
+
+ require Carp::Heavy;
+
+ local $error_level = ($error_level || 0 ) + 1;
+
+ if ( @args % 2 == 1 ) {
+ unshift @args, "message";
+ }
+
+ my %args = ( metaclass => $self, last_error => $@, @args );
+
+ $args{depth} += $error_level;
+
+ my $class = ref $self ? $self->error_class : "Moose::Error::Default";
+
+ Class::MOP::load_class($class);
+
+ $class->new(
+ Carp::caller_info($args{depth}),
+ %args
+ );
+}
+
1;
__END__
This method does the same thing as L<Class::MOP::Class::add_attribute>, but adds
support for taking the C<$params> as a HASH ref.
+=item B<constructor_class ($class_name)>
+
+=item B<destructor_class ($class_name)>
+
+These are the names of classes used when making a class
+immutable. These default to L<Moose::Meta::Method::Constructor> and
+L<Moose::Meta::Method::Destructor> respectively. These accessors are
+read-write, so you can use them to change the class name.
+
+=item B<error_class ($class_name)>
+
+The name of the class used to throw errors. This default to
+L<Moose::Error::Default>, which generates an error with a stacktrace
+just like C<Carp::confess>.
+
+=item B<check_metaclass_compatibility>
+
+Moose overrides this method from C<Class::MOP::Class> and attempts to
+fix some incompatibilities before doing the check.
+
+=item B<throw_error $message, %extra>
+
+Throws the error created by C<create_error> using C<raise_error>
+
+=item B<create_error $message, %extra>
+
+Creates an error message or object.
+
+The default behavior is C<create_error_confess>.
+
+If C<error_class> is set uses C<create_error_object>. Otherwise uses
+C<error_builder> (a code reference or variant name), and calls the appropriate
+C<create_error_$builder> method.
+
+=item B<error_builder $builder_name>
+
+Get or set the error builder. Defaults to C<confess>.
+
+=item B<error_class $class_name>
+
+Get or set the error class. This defaults to L<Moose::Error::Default>.
+
+=item B<create_error_confess %args>
+
+Creates an error using L<Carp/longmess>
+
+=item B<create_error_croak %args>
+
+Creates an error using L<Carp/shortmess>
+
+=item B<create_error_object %args>
+
+Calls C<new> on the C<class> parameter in C<%args>. Usable with C<error_class>
+to support custom error objects for your meta class.
+
+=item B<raise_error $error>
+
+Dies with an error object or string.
+
=back
=head1 BUGS
=head1 COPYRIGHT AND LICENSE
-Copyright 2006-2008 by Infinity Interactive, Inc.
+Copyright 2006-2009 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
projects / gitmo/Moose.git / blobdiff