use strict;
use warnings;
-use Carp 'confess';
-use Scalar::Util 'weaken';
+use MRO::Compat;
+
+use Carp 'confess';
+use Scalar::Util 'weaken';
use Class::MOP::Class;
use Class::MOP::Attribute;
use Class::MOP::Immutable;
-our $VERSION = '0.37';
-our $AUTHORITY = 'cpan:STEVAN';
+BEGIN {
+
+ our $VERSION = '0.65';
+ our $AUTHORITY = 'cpan:STEVAN';
+
+ *IS_RUNNING_ON_5_10 = ($] < 5.009_005)
+ ? sub () { 0 }
+ : sub () { 1 };
+
+ # NOTE:
+ # we may not use this yet, but once
+ # the get_code_info XS gets merged
+ # upstream to it, we will always use
+ # it. But for now it is just kinda
+ # extra overhead.
+ # - SL
+ require Sub::Identify;
+
+ # stash these for a sec, and see how things go
+ my $_PP_subname = sub { $_[1] };
+ my $_PP_get_code_info = \&Sub::Identify::get_code_info;
+
+ if ($ENV{CLASS_MOP_NO_XS}) {
+ # NOTE:
+ # this is if you really want things
+ # to be slow, then you can force the
+ # no-XS rule this way, otherwise we
+ # make an effort to load as much of
+ # the XS as possible.
+ # - SL
+ no warnings 'prototype', 'redefine';
+
+ unless (IS_RUNNING_ON_5_10()) {
+ # get this from MRO::Compat ...
+ *check_package_cache_flag = \&MRO::Compat::__get_pkg_gen_pp;
+ }
+ else {
+ # NOTE:
+ # but if we are running 5.10
+ # there is no need to use the
+ # Pure Perl version since we
+ # can use the built in mro
+ # version instead.
+ # - SL
+ *check_package_cache_flag = \&mro::get_pkg_gen;
+ }
+ # our own version of Sub::Name
+ *subname = $_PP_subname;
+ # and the Sub::Identify version of the get_code_info
+ *get_code_info = $_PP_get_code_info;
+ }
+ else {
+ # now try our best to get as much
+ # of the XS loaded as possible
+ {
+ local $@;
+ eval {
+ require XSLoader;
+ XSLoader::load( 'Class::MOP', $VERSION );
+ };
+ die $@ if $@ && $@ !~ /object version|loadable object/;
+
+ # okay, so the XS failed to load, so
+ # use the pure perl one instead.
+ *get_code_info = $_PP_get_code_info if $@;
+ }
+
+ # get it from MRO::Compat
+ *check_package_cache_flag = \&mro::get_pkg_gen;
+
+ # now try and load the Sub::Name
+ # module and use that as a means
+ # for naming our CVs, if not, we
+ # use the workaround instead.
+ if ( eval { require Sub::Name } ) {
+ *subname = \&Sub::Name::subname;
+ }
+ else {
+ *subname = $_PP_subname;
+ }
+ }
+}
{
# Metaclasses are singletons, so we cache them here.
# there is no need to worry about destruction though
# because they should die only when the program dies.
# After all, do package definitions even get reaped?
- my %METAS;
-
- # means of accessing all the metaclasses that have
+ my %METAS;
+
+ # means of accessing all the metaclasses that have
# been initialized thus far (for mugwumps obj browser)
- sub get_all_metaclasses { %METAS }
- sub get_all_metaclass_instances { values %METAS }
- sub get_all_metaclass_names { keys %METAS }
+ sub get_all_metaclasses { %METAS }
+ sub get_all_metaclass_instances { values %METAS }
+ sub get_all_metaclass_names { keys %METAS }
sub get_metaclass_by_name { $METAS{$_[0]} }
- sub store_metaclass_by_name { $METAS{$_[0]} = $_[1] }
- sub weaken_metaclass { weaken($METAS{$_[0]}) }
+ sub store_metaclass_by_name { $METAS{$_[0]} = $_[1] }
+ sub weaken_metaclass { weaken($METAS{$_[0]}) }
sub does_metaclass_exist { exists $METAS{$_[0]} && defined $METAS{$_[0]} }
- sub remove_metaclass_by_name { $METAS{$_[0]} = undef }
-
+ sub remove_metaclass_by_name { $METAS{$_[0]} = undef }
+
# NOTE:
- # We only cache metaclasses, meaning instances of
- # Class::MOP::Class. We do not cache instance of
+ # We only cache metaclasses, meaning instances of
+ # Class::MOP::Class. We do not cache instance of
# Class::MOP::Package or Class::MOP::Module. Mostly
- # because I don't yet see a good reason to do so.
+ # because I don't yet see a good reason to do so.
+}
+
+sub load_class {
+ my $class = shift;
+
+ if (ref($class) || !defined($class) || !length($class)) {
+ my $display = defined($class) ? $class : 'undef';
+ confess "Invalid class name ($display)";
+ }
+
+ # if the class is not already loaded in the symbol table..
+ unless (is_class_loaded($class)) {
+ # require it
+ my $file = $class . '.pm';
+ $file =~ s{::}{/}g;
+ eval { CORE::require($file) };
+ confess "Could not load class ($class) because : $@" if $@;
+ }
+
+ # initialize a metaclass if necessary
+ unless (does_metaclass_exist($class)) {
+ eval { Class::MOP::Class->initialize($class) };
+ confess "Could not initialize class ($class) because : $@" if $@;
+ }
+
+ return get_metaclass_by_name($class);
}
+sub is_class_loaded {
+ my $class = shift;
+
+ return 0 if ref($class) || !defined($class) || !length($class);
+
+ # walk the symbol table tree to avoid autovififying
+ # \*{${main::}{"Foo::"}} == \*main::Foo::
+
+ my $pack = \*::;
+ foreach my $part (split('::', $class)) {
+ return 0 unless exists ${$$pack}{"${part}::"};
+ $pack = \*{${$$pack}{"${part}::"}};
+ }
+
+ # check for $VERSION or @ISA
+ return 1 if exists ${$$pack}{VERSION}
+ && defined *{${$$pack}{VERSION}}{SCALAR};
+ return 1 if exists ${$$pack}{ISA}
+ && defined *{${$$pack}{ISA}}{ARRAY};
+
+ # check for any method
+ foreach ( keys %{$$pack} ) {
+ next if substr($_, -2, 2) eq '::';
+
+ my $glob = ${$$pack}{$_} || next;
+
+ # constant subs
+ if ( IS_RUNNING_ON_5_10 ) {
+ return 1 if ref $glob eq 'SCALAR';
+ }
+
+ return 1 if defined *{$glob}{CODE};
+ }
+
+ # fail
+ return 0;
+}
+
+
## ----------------------------------------------------------------------------
## Setting up our environment ...
## ----------------------------------------------------------------------------
-## Class::MOP needs to have a few things in the global perl environment so
+## Class::MOP needs to have a few things in the global perl environment so
## that it can operate effectively. Those things are done here.
## ----------------------------------------------------------------------------
# ... nothing yet actually ;)
## ----------------------------------------------------------------------------
-## Bootstrapping
+## Bootstrapping
## ----------------------------------------------------------------------------
-## The code below here is to bootstrap our MOP with itself. This is also
+## The code below here is to bootstrap our MOP with itself. This is also
## sometimes called "tying the knot". By doing this, we make it much easier
## to extend the MOP through subclassing and such since now you can use the
-## MOP itself to extend itself.
-##
+## MOP itself to extend itself.
+##
## Yes, I know, thats weird and insane, but it's a good thing, trust me :)
-## ----------------------------------------------------------------------------
+## ----------------------------------------------------------------------------
-# We need to add in the meta-attributes here so that
-# any subclass of Class::MOP::* will be able to
+# We need to add in the meta-attributes here so that
+# any subclass of Class::MOP::* will be able to
# inherit them using &construct_instance
## --------------------------------------------------------
## Class::MOP::Package
Class::MOP::Package->meta->add_attribute(
- Class::MOP::Attribute->new('$!package' => (
+ Class::MOP::Attribute->new('package' => (
reader => {
- # NOTE: we need to do this in order
- # for the instance meta-object to
+ # NOTE: we need to do this in order
+ # for the instance meta-object to
# not fall into meta-circular death
- #
+ #
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'name' => \&Class::MOP::Package::name
},
init_arg => 'package',
);
Class::MOP::Package->meta->add_attribute(
- Class::MOP::Attribute->new('%!namespace' => (
+ Class::MOP::Attribute->new('namespace' => (
reader => {
# NOTE:
# we just alias the original method
# rather than re-produce it here
'namespace' => \&Class::MOP::Package::namespace
},
- # NOTE:
- # protect this from silliness
- init_arg => '!............( DO NOT DO THIS )............!',
+ init_arg => undef,
default => sub { \undef }
))
);
Class::MOP::Package->meta->add_method('initialize' => sub {
my $class = shift;
my $package_name = shift;
- $class->meta->new_object('package' => $package_name, @_);
+ $class->meta->new_object('package' => $package_name, @_);
});
## --------------------------------------------------------
## Class::MOP::Module
# NOTE:
-# yeah this is kind of stretching things a bit,
+# yeah this is kind of stretching things a bit,
# but truthfully the version should be an attribute
-# of the Module, the weirdness comes from having to
-# stick to Perl 5 convention and store it in the
-# $VERSION package variable. Basically if you just
-# squint at it, it will look how you want it to look.
+# of the Module, the weirdness comes from having to
+# stick to Perl 5 convention and store it in the
+# $VERSION package variable. Basically if you just
+# squint at it, it will look how you want it to look.
# Either as a package variable, or as a attribute of
# the metaclass, isn't abstraction great :)
Class::MOP::Module->meta->add_attribute(
- Class::MOP::Attribute->new('$!version' => (
+ Class::MOP::Attribute->new('version' => (
reader => {
# NOTE:
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'version' => \&Class::MOP::Module::version
},
- # NOTE:
- # protect this from silliness
- init_arg => '!............( DO NOT DO THIS )............!',
+ init_arg => undef,
default => sub { \undef }
))
);
# NOTE:
-# By following the same conventions as version here,
-# we are opening up the possibility that people can
-# use the $AUTHORITY in non-Class::MOP modules as
-# well.
+# By following the same conventions as version here,
+# we are opening up the possibility that people can
+# use the $AUTHORITY in non-Class::MOP modules as
+# well.
Class::MOP::Module->meta->add_attribute(
- Class::MOP::Attribute->new('$!authority' => (
+ Class::MOP::Attribute->new('authority' => (
reader => {
# NOTE:
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'authority' => \&Class::MOP::Module::authority
- },
- # NOTE:
- # protect this from silliness
- init_arg => '!............( DO NOT DO THIS )............!',
+ },
+ init_arg => undef,
default => sub { \undef }
))
);
## Class::MOP::Class
Class::MOP::Class->meta->add_attribute(
- Class::MOP::Attribute->new('%!attributes' => (
+ Class::MOP::Attribute->new('attributes' => (
reader => {
- # NOTE: we need to do this in order
- # for the instance meta-object to
- # not fall into meta-circular death
- #
+ # NOTE: we need to do this in order
+ # for the instance meta-object to
+ # not fall into meta-circular death
+ #
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'get_attribute_map' => \&Class::MOP::Class::get_attribute_map
},
init_arg => 'attributes',
);
Class::MOP::Class->meta->add_attribute(
- Class::MOP::Attribute->new('%!methods' => (
+ Class::MOP::Attribute->new('methods' => (
init_arg => 'methods',
- reader => {
+ reader => {
# NOTE:
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'get_method_map' => \&Class::MOP::Class::get_method_map
},
default => sub { {} }
);
Class::MOP::Class->meta->add_attribute(
- Class::MOP::Attribute->new('@!superclasses' => (
+ Class::MOP::Attribute->new('superclasses' => (
accessor => {
# NOTE:
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'superclasses' => \&Class::MOP::Class::superclasses
},
- # NOTE:
- # protect this from silliness
- init_arg => '!............( DO NOT DO THIS )............!',
+ init_arg => undef,
default => sub { \undef }
))
);
Class::MOP::Class->meta->add_attribute(
- Class::MOP::Attribute->new('$!attribute_metaclass' => (
- reader => {
+ Class::MOP::Attribute->new('attribute_metaclass' => (
+ reader => {
# NOTE:
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'attribute_metaclass' => \&Class::MOP::Class::attribute_metaclass
- },
+ },
init_arg => 'attribute_metaclass',
default => 'Class::MOP::Attribute',
))
);
Class::MOP::Class->meta->add_attribute(
- Class::MOP::Attribute->new('$!method_metaclass' => (
- reader => {
+ Class::MOP::Attribute->new('method_metaclass' => (
+ reader => {
# NOTE:
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'method_metaclass' => \&Class::MOP::Class::method_metaclass
},
init_arg => 'method_metaclass',
- default => 'Class::MOP::Method',
+ default => 'Class::MOP::Method',
))
);
Class::MOP::Class->meta->add_attribute(
- Class::MOP::Attribute->new('$!instance_metaclass' => (
+ Class::MOP::Attribute->new('instance_metaclass' => (
reader => {
- # NOTE: we need to do this in order
- # for the instance meta-object to
- # not fall into meta-circular death
- #
+ # NOTE: we need to do this in order
+ # for the instance meta-object to
+ # not fall into meta-circular death
+ #
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'instance_metaclass' => \&Class::MOP::Class::instance_metaclass
},
init_arg => 'instance_metaclass',
- default => 'Class::MOP::Instance',
+ default => 'Class::MOP::Instance',
))
);
# NOTE:
-# we don't actually need to tie the knot with
-# Class::MOP::Class here, it is actually handled
-# within Class::MOP::Class itself in the
-# construct_class_instance method.
+# we don't actually need to tie the knot with
+# Class::MOP::Class here, it is actually handled
+# within Class::MOP::Class itself in the
+# construct_class_instance method.
## --------------------------------------------------------
## Class::MOP::Attribute
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!name' => (
+ Class::MOP::Attribute->new('name' => (
init_arg => 'name',
reader => {
- # NOTE: we need to do this in order
- # for the instance meta-object to
- # not fall into meta-circular death
- #
+ # NOTE: we need to do this in order
+ # for the instance meta-object to
+ # not fall into meta-circular death
+ #
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'name' => \&Class::MOP::Attribute::name
}
))
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!associated_class' => (
+ Class::MOP::Attribute->new('associated_class' => (
init_arg => 'associated_class',
reader => {
- # NOTE: we need to do this in order
- # for the instance meta-object to
- # not fall into meta-circular death
- #
+ # NOTE: we need to do this in order
+ # for the instance meta-object to
+ # not fall into meta-circular death
+ #
# we just alias the original method
- # rather than re-produce it here
+ # rather than re-produce it here
'associated_class' => \&Class::MOP::Attribute::associated_class
}
))
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!accessor' => (
+ Class::MOP::Attribute->new('accessor' => (
init_arg => 'accessor',
reader => { 'accessor' => \&Class::MOP::Attribute::accessor },
predicate => { 'has_accessor' => \&Class::MOP::Attribute::has_accessor },
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!reader' => (
+ Class::MOP::Attribute->new('reader' => (
init_arg => 'reader',
reader => { 'reader' => \&Class::MOP::Attribute::reader },
predicate => { 'has_reader' => \&Class::MOP::Attribute::has_reader },
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!writer' => (
+ Class::MOP::Attribute->new('initializer' => (
+ init_arg => 'initializer',
+ reader => { 'initializer' => \&Class::MOP::Attribute::initializer },
+ predicate => { 'has_initializer' => \&Class::MOP::Attribute::has_initializer },
+ ))
+);
+
+Class::MOP::Attribute->meta->add_attribute(
+ Class::MOP::Attribute->new('writer' => (
init_arg => 'writer',
reader => { 'writer' => \&Class::MOP::Attribute::writer },
predicate => { 'has_writer' => \&Class::MOP::Attribute::has_writer },
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!predicate' => (
+ Class::MOP::Attribute->new('predicate' => (
init_arg => 'predicate',
reader => { 'predicate' => \&Class::MOP::Attribute::predicate },
predicate => { 'has_predicate' => \&Class::MOP::Attribute::has_predicate },
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!clearer' => (
+ Class::MOP::Attribute->new('clearer' => (
init_arg => 'clearer',
reader => { 'clearer' => \&Class::MOP::Attribute::clearer },
predicate => { 'has_clearer' => \&Class::MOP::Attribute::has_clearer },
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!init_arg' => (
+ Class::MOP::Attribute->new('builder' => (
+ init_arg => 'builder',
+ reader => { 'builder' => \&Class::MOP::Attribute::builder },
+ predicate => { 'has_builder' => \&Class::MOP::Attribute::has_builder },
+ ))
+);
+
+Class::MOP::Attribute->meta->add_attribute(
+ Class::MOP::Attribute->new('init_arg' => (
init_arg => 'init_arg',
reader => { 'init_arg' => \&Class::MOP::Attribute::init_arg },
predicate => { 'has_init_arg' => \&Class::MOP::Attribute::has_init_arg },
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('$!default' => (
+ Class::MOP::Attribute->new('default' => (
init_arg => 'default',
# default has a custom 'reader' method ...
- predicate => { 'has_default' => \&Class::MOP::Attribute::has_default },
+ predicate => { 'has_default' => \&Class::MOP::Attribute::has_default },
))
);
Class::MOP::Attribute->meta->add_attribute(
- Class::MOP::Attribute->new('@!associated_methods' => (
+ Class::MOP::Attribute->new('associated_methods' => (
init_arg => 'associated_methods',
reader => { 'associated_methods' => \&Class::MOP::Attribute::associated_methods },
- default => sub { [] }
+ default => sub { [] }
))
);
# NOTE: (meta-circularity)
# This should be one of the last things done
# it will "tie the knot" with Class::MOP::Attribute
-# so that it uses the attributes meta-objects
-# to construct itself.
+# so that it uses the attributes meta-objects
+# to construct itself.
Class::MOP::Attribute->meta->add_method('new' => sub {
my $class = shift;
my $name = shift;
- my %options = @_;
-
+ my %options = @_;
+
(defined $name && $name)
|| confess "You must provide a name for the attribute";
- $options{init_arg} = $name
+ $options{init_arg} = $name
if not exists $options{init_arg};
-
- (Class::MOP::Attribute::is_default_a_coderef(\%options))
- || confess("References are not allowed as default values, you must ".
- "wrap then in a CODE reference (ex: sub { [] } and not [])")
- if exists $options{default} && ref $options{default};
+
+ if(exists $options{builder}){
+ confess("builder must be a defined scalar value which is a method name")
+ if ref $options{builder} || !(defined $options{builder});
+ confess("Setting both default and builder is not allowed.")
+ if exists $options{default};
+ } else {
+ (Class::MOP::Attribute::is_default_a_coderef(\%options))
+ || confess("References are not allowed as default values, you must ".
+ "wrap the default of '$name' in a CODE reference (ex: sub { [] } and not [])")
+ if exists $options{default} && ref $options{default};
+ }
# return the new object
$class->meta->new_object(name => $name, %options);
Class::MOP::Attribute->meta->add_method('clone' => sub {
my $self = shift;
- $self->meta->clone_object($self, @_);
+ $self->meta->clone_object($self, @_);
});
## --------------------------------------------------------
## Class::MOP::Method
-
Class::MOP::Method->meta->add_attribute(
- Class::MOP::Attribute->new('&!body' => (
+ Class::MOP::Attribute->new('body' => (
init_arg => 'body',
reader => { 'body' => \&Class::MOP::Method::body },
))
);
+Class::MOP::Method->meta->add_attribute(
+ Class::MOP::Attribute->new('package_name' => (
+ init_arg => 'package_name',
+ reader => { 'package_name' => \&Class::MOP::Method::package_name },
+ ))
+);
+
+Class::MOP::Method->meta->add_attribute(
+ Class::MOP::Attribute->new('name' => (
+ init_arg => 'name',
+ reader => { 'name' => \&Class::MOP::Method::name },
+ ))
+);
+
+Class::MOP::Method->meta->add_method('wrap' => sub {
+ my $class = shift;
+ my $code = shift;
+ my %options = @_;
+
+ ('CODE' eq ref($code))
+ || confess "You must supply a CODE reference to bless, not (" . ($code || 'undef') . ")";
+
+ ($options{package_name} && $options{name})
+ || confess "You must supply the package_name and name parameters";
+
+ # return the new object
+ $class->meta->new_object(body => $code, %options);
+});
+
+Class::MOP::Method->meta->add_method('clone' => sub {
+ my $self = shift;
+ $self->meta->clone_object($self, @_);
+});
+
## --------------------------------------------------------
## Class::MOP::Method::Wrapped
# NOTE:
-# the way this item is initialized, this
-# really does not follow the standard
-# practices of attributes, but we put
+# the way this item is initialized, this
+# really does not follow the standard
+# practices of attributes, but we put
# it here for completeness
Class::MOP::Method::Wrapped->meta->add_attribute(
- Class::MOP::Attribute->new('%!modifier_table')
+ Class::MOP::Attribute->new('modifier_table')
+);
+
+## --------------------------------------------------------
+## Class::MOP::Method::Generated
+
+Class::MOP::Method::Generated->meta->add_attribute(
+ Class::MOP::Attribute->new('is_inline' => (
+ init_arg => 'is_inline',
+ reader => { 'is_inline' => \&Class::MOP::Method::Generated::is_inline },
+ default => 0,
+ ))
);
+Class::MOP::Method::Generated->meta->add_method('new' => sub {
+ my ($class, %options) = @_;
+ ($options{package_name} && $options{name})
+ || confess "You must supply the package_name and name parameters";
+ my $self = $class->meta->new_object(%options);
+ $self->initialize_body;
+ $self;
+});
+
## --------------------------------------------------------
## Class::MOP::Method::Accessor
Class::MOP::Method::Accessor->meta->add_attribute(
- Class::MOP::Attribute->new('$!attribute' => (
+ Class::MOP::Attribute->new('attribute' => (
init_arg => 'attribute',
- reader => {
- 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute
+ reader => {
+ 'associated_attribute' => \&Class::MOP::Method::Accessor::associated_attribute
},
- ))
+ ))
);
Class::MOP::Method::Accessor->meta->add_attribute(
- Class::MOP::Attribute->new('$!accessor_type' => (
+ Class::MOP::Attribute->new('accessor_type' => (
init_arg => 'accessor_type',
reader => { 'accessor_type' => \&Class::MOP::Method::Accessor::accessor_type },
- ))
+ ))
);
-Class::MOP::Method::Accessor->meta->add_attribute(
- Class::MOP::Attribute->new('$!is_inline' => (
- init_arg => 'is_inline',
- reader => { 'is_inline' => \&Class::MOP::Method::Accessor::is_inline },
- ))
-);
+Class::MOP::Method::Accessor->meta->add_method('new' => sub {
+ my $class = shift;
+ my %options = @_;
+
+ (exists $options{attribute})
+ || confess "You must supply an attribute to construct with";
+
+ (exists $options{accessor_type})
+ || confess "You must supply an accessor_type to construct with";
+
+ (Scalar::Util::blessed($options{attribute}) && $options{attribute}->isa('Class::MOP::Attribute'))
+ || confess "You must supply an attribute which is a 'Class::MOP::Attribute' instance";
+
+ ($options{package_name} && $options{name})
+ || confess "You must supply the package_name and name parameters";
+
+ # return the new object
+ my $self = $class->meta->new_object(%options);
+
+ # we don't want this creating
+ # a cycle in the code, if not
+ # needed
+ Scalar::Util::weaken($self->{'attribute'});
+
+ $self->initialize_body;
+
+ $self;
+});
+
## --------------------------------------------------------
## Class::MOP::Method::Constructor
Class::MOP::Method::Constructor->meta->add_attribute(
- Class::MOP::Attribute->new('%!options' => (
+ Class::MOP::Attribute->new('options' => (
init_arg => 'options',
- reader => {
- 'options' => \&Class::MOP::Method::Constructor::options
+ reader => {
+ 'options' => \&Class::MOP::Method::Constructor::options
},
- ))
+ default => sub { +{} }
+ ))
);
Class::MOP::Method::Constructor->meta->add_attribute(
- Class::MOP::Attribute->new('$!associated_metaclass' => (
+ Class::MOP::Attribute->new('associated_metaclass' => (
init_arg => 'metaclass',
- reader => {
- 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass
- },
- ))
+ reader => {
+ 'associated_metaclass' => \&Class::MOP::Method::Constructor::associated_metaclass
+ },
+ ))
);
+Class::MOP::Method::Constructor->meta->add_method('new' => sub {
+ my $class = shift;
+ my %options = @_;
+
+ (Scalar::Util::blessed $options{metaclass} && $options{metaclass}->isa('Class::MOP::Class'))
+ || confess "You must pass a metaclass instance if you want to inline"
+ if $options{is_inline};
+
+ ($options{package_name} && $options{name})
+ || confess "You must supply the package_name and name parameters";
+
+ # return the new object
+ my $self = $class->meta->new_object(%options);
+
+ # we don't want this creating
+ # a cycle in the code, if not
+ # needed
+ Scalar::Util::weaken($self->{'associated_metaclass'});
+
+ $self->initialize_body;
+
+ $self;
+});
+
## --------------------------------------------------------
## Class::MOP::Instance
# NOTE:
-# these don't yet do much of anything, but are just
+# these don't yet do much of anything, but are just
# included for completeness
Class::MOP::Instance->meta->add_attribute(
- Class::MOP::Attribute->new('$!meta')
+ Class::MOP::Attribute->new('meta')
);
Class::MOP::Instance->meta->add_attribute(
- Class::MOP::Attribute->new('@!slots')
+ Class::MOP::Attribute->new('slots')
);
## --------------------------------------------------------
## Now close all the Class::MOP::* classes
# NOTE:
-# we don't need to inline the
-# constructors or the accessors
-# this only lengthens the compile
-# time of the MOP, and gives us
+# we don't need to inline the
+# constructors or the accessors
+# this only lengthens the compile
+# time of the MOP, and gives us
# no actual benefits.
$_->meta->make_immutable(
inline_constructor => 0,
inline_accessors => 0,
) for qw/
- Class::MOP::Package
- Class::MOP::Module
- Class::MOP::Class
-
+ Class::MOP::Package
+ Class::MOP::Module
+ Class::MOP::Class
+
Class::MOP::Attribute
- Class::MOP::Method
- Class::MOP::Instance
-
- Class::MOP::Object
+ Class::MOP::Method
+ Class::MOP::Instance
+
+ Class::MOP::Object
+
+ Class::MOP::Method::Generated
Class::MOP::Method::Accessor
- Class::MOP::Method::Constructor
- Class::MOP::Method::Wrapped
+ Class::MOP::Method::Constructor
+ Class::MOP::Method::Wrapped
/;
1;
=pod
-=head1 NAME
+=head1 NAME
Class::MOP - A Meta Object Protocol for Perl 5
-=head1 SYNOPSIS
-
- # ... This will come later, for now see
- # the other SYNOPSIS for more information
-
=head1 DESCRIPTON
-This module is an attempt to create a meta object protocol for the
-Perl 5 object system. It makes no attempt to change the behavior or
-characteristics of the Perl 5 object system, only to create a
+This module is a fully functioning meta object protocol for the
+Perl 5 object system. It makes no attempt to change the behavior or
+characteristics of the Perl 5 object system, only to create a
protocol for its manipulation and introspection.
-That said, it does attempt to create the tools for building a rich
-set of extensions to the Perl 5 object system. Every attempt has been
-made for these tools to keep to the spirit of the Perl 5 object
+That said, it does attempt to create the tools for building a rich
+set of extensions to the Perl 5 object system. Every attempt has been
+made for these tools to keep to the spirit of the Perl 5 object
system that we all know and love.
-This documentation is admittedly sparse on details, as time permits
-I will try to improve them. For now, I suggest looking at the items
-listed in the L<SEE ALSO> section for more information. In particular
-the book "The Art of the Meta Object Protocol" was very influential
+This documentation is admittedly sparse on details, as time permits
+I will try to improve them. For now, I suggest looking at the items
+listed in the L<SEE ALSO> section for more information. In particular
+the book "The Art of the Meta Object Protocol" was very influential
in the development of this system.
=head2 What is a Meta Object Protocol?
-A meta object protocol is an API to an object system.
+A meta object protocol is an API to an object system.
-To be more specific, it is a set of abstractions of the components of
-an object system (typically things like; classes, object, methods,
-object attributes, etc.). These abstractions can then be used to both
+To be more specific, it is a set of abstractions of the components of
+an object system (typically things like; classes, object, methods,
+object attributes, etc.). These abstractions can then be used to both
inspect and manipulate the object system which they describe.
-It can be said that there are two MOPs for any object system; the
-implicit MOP, and the explicit MOP. The implicit MOP handles things
-like method dispatch or inheritance, which happen automatically as
-part of how the object system works. The explicit MOP typically
-handles the introspection/reflection features of the object system.
-All object systems have implicit MOPs, without one, they would not
-work. Explict MOPs however as less common, and depending on the
-language can vary from restrictive (Reflection in Java or C#) to
-wide open (CLOS is a perfect example).
+It can be said that there are two MOPs for any object system; the
+implicit MOP, and the explicit MOP. The implicit MOP handles things
+like method dispatch or inheritance, which happen automatically as
+part of how the object system works. The explicit MOP typically
+handles the introspection/reflection features of the object system.
+All object systems have implicit MOPs, without one, they would not
+work. Explict MOPs however as less common, and depending on the
+language can vary from restrictive (Reflection in Java or C#) to
+wide open (CLOS is a perfect example).
=head2 Yet Another Class Builder!! Why?
-This is B<not> a class builder so much as it is a I<class builder
-B<builder>>. My intent is that an end user does not use this module
-directly, but instead this module is used by module authors to
-build extensions and features onto the Perl 5 object system.
+This is B<not> a class builder so much as it is a I<class builder
+B<builder>>. My intent is that an end user does not use this module
+directly, but instead this module is used by module authors to
+build extensions and features onto the Perl 5 object system.
=head2 Who is this module for?
-This module is specifically for anyone who has ever created or
-wanted to create a module for the Class:: namespace. The tools which
-this module will provide will hopefully make it easier to do more
-complex things with Perl 5 classes by removing such barriers as
-the need to hack the symbol tables, or understand the fine details
-of method dispatch.
+This module is specifically for anyone who has ever created or
+wanted to create a module for the Class:: namespace. The tools which
+this module will provide will hopefully make it easier to do more
+complex things with Perl 5 classes by removing such barriers as
+the need to hack the symbol tables, or understand the fine details
+of method dispatch.
=head2 What changes do I have to make to use this module?
-This module was designed to be as unintrusive as possible. Many of
-its features are accessible without B<any> change to your existsing
-code at all. It is meant to be a compliment to your existing code and
-not an intrusion on your code base. Unlike many other B<Class::>
-modules, this module B<does not> require you subclass it, or even that
-you C<use> it in within your module's package.
+This module was designed to be as unintrusive as possible. Many of
+its features are accessible without B<any> change to your existsing
+code at all. It is meant to be a compliment to your existing code and
+not an intrusion on your code base. Unlike many other B<Class::>
+modules, this module B<does not> require you subclass it, or even that
+you C<use> it in within your module's package.
-The only features which requires additions to your code are the
+The only features which requires additions to your code are the
attribute handling and instance construction features, and these are
-both completely optional features. The only reason for this is because
-Perl 5's object system does not actually have these features built
+both completely optional features. The only reason for this is because
+Perl 5's object system does not actually have these features built
in. More information about this feature can be found below.
=head2 A Note about Performance?
-It is a common misconception that explict MOPs are performance drains.
-But this is not a universal truth at all, it is an side-effect of
-specific implementations. For instance, using Java reflection is much
-slower because the JVM cannot take advantage of any compiler
-optimizations, and the JVM has to deal with much more runtime type
-information as well. Reflection in C# is marginally better as it was
-designed into the language and runtime (the CLR). In contrast, CLOS
-(the Common Lisp Object System) was built to support an explicit MOP,
-and so performance is tuned for it.
-
-This library in particular does it's absolute best to avoid putting
-B<any> drain at all upon your code's performance. In fact, by itself
-it does nothing to affect your existing code. So you only pay for
+It is a common misconception that explict MOPs are performance drains.
+But this is not a universal truth at all, it is an side-effect of
+specific implementations. For instance, using Java reflection is much
+slower because the JVM cannot take advantage of any compiler
+optimizations, and the JVM has to deal with much more runtime type
+information as well. Reflection in C# is marginally better as it was
+designed into the language and runtime (the CLR). In contrast, CLOS
+(the Common Lisp Object System) was built to support an explicit MOP,
+and so performance is tuned for it.
+
+This library in particular does it's absolute best to avoid putting
+B<any> drain at all upon your code's performance. In fact, by itself
+it does nothing to affect your existing code. So you only pay for
what you actually use.
=head2 About Metaclass compatibility
-This module makes sure that all metaclasses created are both upwards
-and downwards compatible. The topic of metaclass compatibility is
-highly esoteric and is something only encountered when doing deep and
-involved metaclass hacking. There are two basic kinds of metaclass
-incompatibility; upwards and downwards.
+This module makes sure that all metaclasses created are both upwards
+and downwards compatible. The topic of metaclass compatibility is
+highly esoteric and is something only encountered when doing deep and
+involved metaclass hacking. There are two basic kinds of metaclass
+incompatibility; upwards and downwards.
-Upwards metaclass compatibility means that the metaclass of a
-given class is either the same as (or a subclass of) all of the
+Upwards metaclass compatibility means that the metaclass of a
+given class is either the same as (or a subclass of) all of the
class's ancestors.
-Downward metaclass compatibility means that the metaclasses of a
-given class's anscestors are all either the same as (or a subclass
+Downward metaclass compatibility means that the metaclasses of a
+given class's anscestors are all either the same as (or a subclass
of) that metaclass.
-Here is a diagram showing a set of two classes (C<A> and C<B>) and
-two metaclasses (C<Meta::A> and C<Meta::B>) which have correct
+Here is a diagram showing a set of two classes (C<A> and C<B>) and
+two metaclasses (C<Meta::A> and C<Meta::B>) which have correct
metaclass compatibility both upwards and downwards.
+---------+ +---------+
| Meta::A |<----| Meta::B | <....... (instance of )
- +---------+ +---------+ <------- (inherits from)
+ +---------+ +---------+ <------- (inherits from)
^ ^
: :
+---------+ +---------+
| A |<----| B |
+---------+ +---------+
-As I said this is a highly esoteric topic and one you will only run
-into if you do a lot of subclassing of B<Class::MOP::Class>. If you
-are interested in why this is an issue see the paper
-I<Uniform and safe metaclass composition> linked to in the
+As I said this is a highly esoteric topic and one you will only run
+into if you do a lot of subclassing of B<Class::MOP::Class>. If you
+are interested in why this is an issue see the paper
+I<Uniform and safe metaclass composition> linked to in the
L<SEE ALSO> section of this document.
=head2 Using custom metaclasses
-Always use the metaclass pragma when using a custom metaclass, this
-will ensure the proper initialization order and not accidentely
-create an incorrect type of metaclass for you. This is a very rare
-problem, and one which can only occur if you are doing deep metaclass
+Always use the metaclass pragma when using a custom metaclass, this
+will ensure the proper initialization order and not accidentely
+create an incorrect type of metaclass for you. This is a very rare
+problem, and one which can only occur if you are doing deep metaclass
programming. So in other words, don't worry about it.
=head1 PROTOCOLS
-The protocol is divided into 3 main sub-protocols:
+The protocol is divided into 4 main sub-protocols:
=over 4
=item The Class protocol
-This provides a means of manipulating and introspecting a Perl 5
-class. It handles all of symbol table hacking for you, and provides
+This provides a means of manipulating and introspecting a Perl 5
+class. It handles all of symbol table hacking for you, and provides
a rich set of methods that go beyond simple package introspection.
See L<Class::MOP::Class> for more details.
=item The Attribute protocol
-This provides a consistent represenation for an attribute of a
-Perl 5 class. Since there are so many ways to create and handle
-atttributes in Perl 5 OO, this attempts to provide as much of a
-unified approach as possible, while giving the freedom and
+This provides a consistent represenation for an attribute of a
+Perl 5 class. Since there are so many ways to create and handle
+attributes in Perl 5 OO, this attempts to provide as much of a
+unified approach as possible, while giving the freedom and
flexibility to subclass for specialization.
See L<Class::MOP::Attribute> for more details.
=item The Method protocol
-This provides a means of manipulating and introspecting methods in
-the Perl 5 object system. As with attributes, there are many ways to
-approach this topic, so we try to keep it pretty basic, while still
+This provides a means of manipulating and introspecting methods in
+the Perl 5 object system. As with attributes, there are many ways to
+approach this topic, so we try to keep it pretty basic, while still
making it possible to extend the system in many ways.
See L<Class::MOP::Method> for more details.
+=item The Instance protocol
+
+This provides a layer of abstraction for creating object instances.
+Since the other layers use this protocol, it is relatively easy to
+change the type of your instances from the default HASH ref to other
+types of references. Several examples are provided in the F<examples/>
+directory included in this distribution.
+
+See L<Class::MOP::Instance> for more details.
+
=back
=head1 FUNCTIONS
-Class::MOP holds a cache of metaclasses, the following are functions
-(B<not methods>) which can be used to access that cache. It is not
-recommended that you mess with this, bad things could happen. But if
+=head2 Constants
+
+=over 4
+
+=item I<IS_RUNNING_ON_5_10>
+
+We set this constant depending on what version perl we are on, this
+allows us to take advantage of new 5.10 features and stay backwards
+compat.
+
+=back
+
+=head2 Utility functions
+
+=over 4
+
+=item B<load_class ($class_name)>
+
+This will load a given C<$class_name> and if it does not have an
+already initialized metaclass, then it will intialize one for it.
+This function can be used in place of tricks like
+C<eval "use $module"> or using C<require>.
+
+=item B<is_class_loaded ($class_name)>
+
+This will return a boolean depending on if the C<$class_name> has
+been loaded.
+
+NOTE: This does a basic check of the symbol table to try and
+determine as best it can if the C<$class_name> is loaded, it
+is probably correct about 99% of the time.
+
+=item B<check_package_cache_flag ($pkg)>
+
+This will return an integer that is managed by C<Class::MOP::Class>
+to determine if a module's symbol table has been altered.
+
+In Perl 5.10 or greater, this flag is package specific. However in
+versions prior to 5.10, this will use the C<PL_sub_generation> variable
+which is not package specific.
+
+=item B<get_code_info ($code)>
+
+This function returns two values, the name of the package the C<$code>
+is from and the name of the C<$code> itself. This is used by several
+elements of the MOP to detemine where a given C<$code> reference is from.
+
+=item B<subname ($name, $code)>
+
+B<NOTE: DO NOT USE THIS FUNCTION, IT IS FOR INTERNAL USE ONLY!>
+
+If possible, we will load the L<Sub::Name> module and this will function
+as C<Sub::Name::subname> does, otherwise it will just return the C<$code>
+argument.
+
+=back
+
+=head2 Metaclass cache functions
+
+Class::MOP holds a cache of metaclasses, the following are functions
+(B<not methods>) which can be used to access that cache. It is not
+recommended that you mess with this, bad things could happen. But if
you are brave and willing to risk it, go for it.
=over 4
=item B<get_all_metaclasses>
-This will return an hash of all the metaclass instances that have
-been cached by B<Class::MOP::Class> keyed by the package name.
+This will return an hash of all the metaclass instances that have
+been cached by B<Class::MOP::Class> keyed by the package name.
=item B<get_all_metaclass_instances>
-This will return an array of all the metaclass instances that have
+This will return an array of all the metaclass instances that have
been cached by B<Class::MOP::Class>.
=item B<get_all_metaclass_names>
-This will return an array of all the metaclass names that have
+This will return an array of all the metaclass names that have
been cached by B<Class::MOP::Class>.
=item B<get_metaclass_by_name ($name)>
+This will return a cached B<Class::MOP::Class> instance of nothing
+if no metaclass exist by that C<$name>.
+
=item B<store_metaclass_by_name ($name, $meta)>
+This will store a metaclass in the cache at the supplied C<$key>.
+
=item B<weaken_metaclass ($name)>
+In rare cases it is desireable to store a weakened reference in
+the metaclass cache. This function will weaken the reference to
+the metaclass stored in C<$name>.
+
=item B<does_metaclass_exist ($name)>
+This will return true of there exists a metaclass stored in the
+C<$name> key and return false otherwise.
+
=item B<remove_metaclass_by_name ($name)>
+This will remove a the metaclass stored in the C<$name> key.
+
=back
=head1 SEE ALSO
=head2 Books
-There are very few books out on Meta Object Protocols and Metaclasses
-because it is such an esoteric topic. The following books are really
-the only ones I have found. If you know of any more, B<I<please>>
+There are very few books out on Meta Object Protocols and Metaclasses
+because it is such an esoteric topic. The following books are really
+the only ones I have found. If you know of any more, B<I<please>>
email me and let me know, I would love to hear about them.
=over 4
=item Uniform and safe metaclass composition
-An excellent paper by the people who brought us the original Traits paper.
-This paper is on how Traits can be used to do safe metaclass composition,
-and offers an excellent introduction section which delves into the topic of
+An excellent paper by the people who brought us the original Traits paper.
+This paper is on how Traits can be used to do safe metaclass composition,
+and offers an excellent introduction section which delves into the topic of
metaclass compatibility.
L<http://www.iam.unibe.ch/~scg/Archive/Papers/Duca05ySafeMetaclassTrait.pdf>
=item Safe Metaclass Programming
-This paper seems to precede the above paper, and propose a mix-in based
-approach as opposed to the Traits based approach. Both papers have similar
-information on the metaclass compatibility problem space.
+This paper seems to precede the above paper, and propose a mix-in based
+approach as opposed to the Traits based approach. Both papers have similar
+information on the metaclass compatibility problem space.
L<http://citeseer.ist.psu.edu/37617.html>
=back
-=head2 Article
+=head2 Articles
=over 4
-=item CPAN Module Review of Class::MOP
+=item CPAN Module Review of Class::MOP
L<http://www.oreillynet.com/onlamp/blog/2006/06/cpan_module_review_classmop.html>
=head1 SIMILAR MODULES
-As I have said above, this module is a class-builder-builder, so it is
-not the same thing as modules like L<Class::Accessor> and
-L<Class::MethodMaker>. That being said there are very few modules on CPAN
-with similar goals to this module. The one I have found which is most
-like this module is L<Class::Meta>, although it's philosophy and the MOP it
-creates are very different from this modules.
+As I have said above, this module is a class-builder-builder, so it is
+not the same thing as modules like L<Class::Accessor> and
+L<Class::MethodMaker>. That being said there are very few modules on CPAN
+with similar goals to this module. The one I have found which is most
+like this module is L<Class::Meta>, although it's philosophy and the MOP it
+creates are very different from this modules.
=head1 BUGS
-All complex software has bugs lurking in it, and this module is no
+All complex software has bugs lurking in it, and this module is no
exception. If you find a bug please either email me, or add the bug
to cpan-RT.
-=head1 CODE COVERAGE
-
-I use L<Devel::Cover> to test the code coverage of my tests, below is the
-L<Devel::Cover> report on this module's test suite.
-
- ---------------------------- ------ ------ ------ ------ ------ ------ ------
- File stmt bran cond sub pod time total
- ---------------------------- ------ ------ ------ ------ ------ ------ ------
- Class/MOP.pm 97.7 100.0 88.9 94.7 100.0 3.2 96.6
- Class/MOP/Attribute.pm 75.5 77.9 82.4 88.3 100.0 4.0 81.5
- Class/MOP/Class.pm 96.9 88.8 72.1 98.2 100.0 35.8 91.4
- Class/MOP/Class/Immutable.pm 88.2 60.0 n/a 95.5 100.0 0.5 84.6
- Class/MOP/Instance.pm 86.4 75.0 33.3 86.2 100.0 1.2 87.5
- Class/MOP/Method.pm 97.5 75.0 61.5 80.6 100.0 12.7 89.7
- Class/MOP/Module.pm 100.0 n/a 55.6 100.0 100.0 0.1 90.7
- Class/MOP/Object.pm 73.3 n/a 20.0 80.0 100.0 0.1 66.7
- Class/MOP/Package.pm 94.6 71.7 33.3 100.0 100.0 42.2 87.0
- metaclass.pm 100.0 100.0 83.3 100.0 n/a 0.2 97.7
- ---------------------------- ------ ------ ------ ------ ------ ------ ------
- Total 91.3 80.4 69.8 91.9 100.0 100.0 88.1
- ---------------------------- ------ ------ ------ ------ ------ ------ ------
-
=head1 ACKNOWLEDGEMENTS
=over 4
=item Rob Kinyon
-Thanks to Rob for actually getting the development of this module kick-started.
+Thanks to Rob for actually getting the development of this module kick-started.
=back
Stevan Little E<lt>stevan@iinteractive.comE<gt>
-Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
+B<with contributions from:>
+
+Brandon (blblack) Black
+
+Guillermo (groditi) Roditi
+
+Matt (mst) Trout
+
+Rob (robkinyon) Kinyon
+
+Yuval (nothingmuch) Kogman
+
+Scott (konobi) McWhirter
=head1 COPYRIGHT AND LICENSE
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
-it under the same terms as Perl itself.
+it under the same terms as Perl itself.
=cut
projects / gitmo/Class-MOP.git / blobdiff