X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FClass%2FMOP%2FPackage.pm;h=e87df5566a76f15a1dee57369e9314671068335b;hb=d004c8d565f9b314da7652e9368aeb4587ffaa3d;hp=1ba7caf53ef0961472122089096f1463184a0785;hpb=6e1c8b63d87c6e1d8e84e15cc2c1f5336780515b;p=gitmo%2FClass-MOP.git diff --git a/lib/Class/MOP/Package.pm b/lib/Class/MOP/Package.pm index 1ba7caf..e87df55 100644 --- a/lib/Class/MOP/Package.pm +++ b/lib/Class/MOP/Package.pm @@ -4,10 +4,12 @@ package Class::MOP::Package; use strict; use warnings; -use Scalar::Util 'blessed'; +use Scalar::Util 'blessed', 'reftype'; use Carp 'confess'; +use Package::Stash; -our $VERSION = '0.63'; +our $VERSION = '1.12'; +$VERSION = eval $VERSION; our $AUTHORITY = 'cpan:STEVAN'; use base 'Class::MOP::Object'; @@ -15,21 +17,70 @@ use base 'Class::MOP::Object'; # creation ... sub initialize { - my $class = shift; - my $package_name = shift; + my ( $class, @args ) = @_; + + unshift @args, "package" if @args % 2; + + my %options = @args; + my $package_name = $options{package}; + + # we hand-construct the class # until we can bootstrap it - no strict 'refs'; - return bless { - '$!package' => $package_name, + if ( my $meta = Class::MOP::get_metaclass_by_name($package_name) ) { + return $meta; + } else { + my $meta = ( ref $class || $class )->_new({ + 'package' => $package_name, + %options, + }); + Class::MOP::store_metaclass_by_name($package_name, $meta); + + return $meta; + } +} + +sub reinitialize { + my ( $class, @args ) = @_; + + unshift @args, "package" if @args % 2; + + my %options = @args; + my $package_name = delete $options{package}; + + (defined $package_name && $package_name + && (!blessed $package_name || $package_name->isa('Class::MOP::Package'))) + || confess "You must pass a package name or an existing Class::MOP::Package instance"; + + $package_name = $package_name->name + if blessed $package_name; + + Class::MOP::remove_metaclass_by_name($package_name); + + $class->initialize($package_name, %options); # call with first arg form for compat +} + +sub _new { + my $class = shift; + + return Class::MOP::Class->initialize($class)->new_object(@_) + if $class ne __PACKAGE__; + + my $params = @_ == 1 ? $_[0] : {@_}; + + return bless { + package => $params->{package}, + # NOTE: - # because of issues with the Perl API - # to the typeglob in some versions, we - # need to just always grab a new - # reference to the hash in the accessor. - # Ideally we could just store a ref and + # because of issues with the Perl API + # to the typeglob in some versions, we + # need to just always grab a new + # reference to the hash in the accessor. + # Ideally we could just store a ref and # it would Just Work, but oh well :\ - '%!namespace' => \undef, + + namespace => \undef, + } => $class; } @@ -39,45 +90,11 @@ sub initialize { # all these attribute readers will be bootstrapped # away in the Class::MOP bootstrap section -sub name { $_[0]->{'$!package'} } -sub namespace { - # NOTE: - # because of issues with the Perl API - # to the typeglob in some versions, we - # need to just always grab a new - # reference to the hash here. Ideally - # we could just store a ref and it would - # Just Work, but oh well :\ - no strict 'refs'; - \%{$_[0]->{'$!package'} . '::'} +sub _package_stash { + $_[0]->{_package_stash} ||= Package::Stash->new($_[0]->name) } - -# utility methods - -{ - my %SIGIL_MAP = ( - '$' => 'SCALAR', - '@' => 'ARRAY', - '%' => 'HASH', - '&' => 'CODE', - ); - - sub _deconstruct_variable_name { - my ($self, $variable) = @_; - - (defined $variable) - || confess "You must pass a variable name"; - - my $sigil = substr($variable, 0, 1, ''); - - (defined $sigil) - || confess "The variable name must include a sigil"; - - (exists $SIGIL_MAP{$sigil}) - || confess "I do not recognize that sigil '$sigil'"; - - return ($variable, $sigil, $SIGIL_MAP{$sigil}); - } +sub namespace { + $_[0]->_package_stash->namespace } # Class attributes @@ -85,172 +102,45 @@ sub namespace { # ... these functions have to touch the symbol table itself,.. yuk sub add_package_symbol { - my ($self, $variable, $initial_value) = @_; - - my ($name, $sigil, $type) = ref $variable eq 'HASH' - ? @{$variable}{qw[name sigil type]} - : $self->_deconstruct_variable_name($variable); - - my $pkg = $self->{'$!package'}; - - no strict 'refs'; - no warnings 'redefine', 'misc'; - *{$pkg . '::' . $name} = ref $initial_value ? $initial_value : \$initial_value; + my $self = shift; + $self->_package_stash->add_symbol(@_); } sub remove_package_glob { - my ($self, $name) = @_; - no strict 'refs'; - delete ${$self->name . '::'}{$name}; + my $self = shift; + $self->_package_stash->remove_glob(@_); } # ... these functions deal with stuff on the namespace level sub has_package_symbol { - my ($self, $variable) = @_; - - my ($name, $sigil, $type) = ref $variable eq 'HASH' - ? @{$variable}{qw[name sigil type]} - : $self->_deconstruct_variable_name($variable); - - my $namespace = $self->namespace; - - return 0 unless exists $namespace->{$name}; - - # FIXME: - # For some really stupid reason - # a typeglob will have a default - # value of \undef in the SCALAR - # slot, so we need to work around - # this. Which of course means that - # if you put \undef in your scalar - # then this is broken. - - if (ref($namespace->{$name}) eq 'SCALAR') { - return ($type eq 'CODE' ? 1 : 0); - } - elsif ($type eq 'SCALAR') { - my $val = *{$namespace->{$name}}{$type}; - return defined(${$val}) ? 1 : 0; - } - else { - defined(*{$namespace->{$name}}{$type}) ? 1 : 0; - } + my $self = shift; + $self->_package_stash->has_symbol(@_); } sub get_package_symbol { - my ($self, $variable) = @_; - - my ($name, $sigil, $type) = ref $variable eq 'HASH' - ? @{$variable}{qw[name sigil type]} - : $self->_deconstruct_variable_name($variable); - - my $namespace = $self->namespace; - - $self->add_package_symbol($variable) - unless exists $namespace->{$name}; + my $self = shift; + $self->_package_stash->get_symbol(@_); +} - if (ref($namespace->{$name}) eq 'SCALAR') { - if ($type eq 'CODE') { - no strict 'refs'; - return \&{$self->name.'::'.$name}; - } - else { - return undef; - } - } - else { - return *{$namespace->{$name}}{$type}; - } +sub get_or_add_package_symbol { + my $self = shift; + $self->_package_stash->get_or_add_symbol(@_); } sub remove_package_symbol { - my ($self, $variable) = @_; - - my ($name, $sigil, $type) = ref $variable eq 'HASH' - ? @{$variable}{qw[name sigil type]} - : $self->_deconstruct_variable_name($variable); - - # FIXME: - # no doubt this is grossly inefficient and - # could be done much easier and faster in XS - - my ($scalar_desc, $array_desc, $hash_desc, $code_desc) = ( - { sigil => '$', type => 'SCALAR', name => $name }, - { sigil => '@', type => 'ARRAY', name => $name }, - { sigil => '%', type => 'HASH', name => $name }, - { sigil => '&', type => 'CODE', name => $name }, - ); - - my ($scalar, $array, $hash, $code); - if ($type eq 'SCALAR') { - $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); - $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); - $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); - } - elsif ($type eq 'ARRAY') { - $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); - $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); - $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); - } - elsif ($type eq 'HASH') { - $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); - $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); - $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); - } - elsif ($type eq 'CODE') { - $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); - $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); - $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); - } - else { - confess "This should never ever ever happen"; - } - - $self->remove_package_glob($name); - - $self->add_package_symbol($scalar_desc => $scalar) if defined $scalar; - $self->add_package_symbol($array_desc => $array) if defined $array; - $self->add_package_symbol($hash_desc => $hash) if defined $hash; - $self->add_package_symbol($code_desc => $code) if defined $code; + my $self = shift; + $self->_package_stash->remove_symbol(@_); } sub list_all_package_symbols { - my ($self, $type_filter) = @_; - - my $namespace = $self->namespace; - return keys %{$namespace} unless defined $type_filter; - - # NOTE: - # or we can filter based on - # type (SCALAR|ARRAY|HASH|CODE) - return grep { - (ref($namespace->{$_}) - ? (ref($namespace->{$_}) eq 'SCALAR' && $type_filter eq 'CODE') - : (ref(\$namespace->{$_}) eq 'GLOB' - && defined(*{$namespace->{$_}}{$type_filter}))); - } keys %{$namespace}; + my $self = shift; + $self->_package_stash->list_all_symbols(@_); } sub get_all_package_symbols { - my ($self, $type_filter) = @_; - my $namespace = $self->namespace; - return %{$namespace} unless defined $type_filter; - - # NOTE: - # or we can filter based on - # type (SCALAR|ARRAY|HASH|CODE) - no strict 'refs'; - return map { - $_ => (ref($namespace->{$_}) eq 'SCALAR' - ? ($type_filter eq 'CODE' ? \&{$self->name . '::' . $_} : undef) - : *{$namespace->{$_}}{$type_filter}) - } grep { - (ref($namespace->{$_}) - ? (ref($namespace->{$_}) eq 'SCALAR' && $type_filter eq 'CODE') - : (ref(\$namespace->{$_}) eq 'GLOB' - && defined(*{$namespace->{$_}}{$type_filter}))); - } keys %{$namespace}; + my $self = shift; + $self->_package_stash->get_all_symbols(@_); } 1; @@ -265,73 +155,92 @@ Class::MOP::Package - Package Meta Object =head1 DESCRIPTION -This is an abstraction of a Perl 5 package, it is a superclass of -L and provides all of the symbol table -introspection methods. +The Package Protocol provides an abstraction of a Perl 5 package. A +package is basically namespace, and this module provides methods for +looking at and changing that namespace's symbol table. =head1 METHODS =over 4 -=item B +=item B<< Class::MOP::Package->initialize($package_name) >> + +This method creates a new C instance which +represents specified package. If an existing metaclass object exists +for the package, that will be returned instead. + +=item B<< Class::MOP::Package->reinitialize($package) >> + +This method forcibly removes any existing metaclass for the package +before calling C. In contrast to C, you may +also pass an existing C instance instead of just +a package name as C<$package>. + +Do not call this unless you know what you are doing. + +=item B<< $metapackage->name >> + +This is returns the package's name, as passed to the constructor. -Returns a metaclass for this package. +=item B<< $metapackage->namespace >> -=item B +This returns a hash reference to the package's symbol table. The keys +are symbol names and the values are typeglob references. -This will initialize a Class::MOP::Package instance which represents -the package of C<$package_name>. +=item B<< $metapackage->add_package_symbol($variable_name, $initial_value) >> -=item B +This method accepts a variable name and an optional initial value. The +C<$variable_name> must contain a leading sigil. -This is a read-only attribute which returns the package name for the -given instance. +This method creates the variable in the package's symbol table, and +sets it to the initial value if one was provided. -=item B +=item B<< $metapackage->get_package_symbol($variable_name) >> -This returns a HASH reference to the symbol table. The keys of the -HASH are the symbol names, and the values are typeglob references. +Given a variable name, this method returns the variable as a reference +or undef if it does not exist. The C<$variable_name> must contain a +leading sigil. -=item B +=item B<< $metapackage->get_or_add_package_symbol($variable_name) >> -Given a C<$variable_name>, which must contain a leading sigil, this -method will create that variable within the package which houses the -class. It also takes an optional C<$initial_value>, which must be a -reference of the same type as the sigil of the C<$variable_name> -implies. +Given a variable name, this method returns the variable as a reference. +If it does not exist, a default value will be generated if possible. The +C<$variable_name> must contain a leading sigil. -=item B +=item B<< $metapackage->has_package_symbol($variable_name) >> -This will return a reference to the package variable in -C<$variable_name>. +Returns true if there is a package variable defined for +C<$variable_name>. The C<$variable_name> must contain a leading sigil. -=item B +=item B<< $metapackage->remove_package_symbol($variable_name) >> -Returns true (C<1>) if there is a package variable defined for -C<$variable_name>, and false (C<0>) otherwise. +This will remove the package variable specified C<$variable_name>. The +C<$variable_name> must contain a leading sigil. -=item B +=item B<< $metapackage->remove_package_glob($glob_name) >> -This will attempt to remove the package variable at C<$variable_name>. +Given the name of a glob, this will remove that glob from the +package's symbol table. Glob names do not include a sigil. Removing +the glob removes all variables and subroutines with the specified +name. -=item B +=item B<< $metapackage->list_all_package_symbols($type_filter) >> -This will attempt to remove the entire typeglob associated with -C<$glob_name> from the package. +This will list all the glob names associated with the current +package. These names do not have leading sigils. -=item B +You can provide an optional type filter, which should be one of +'SCALAR', 'ARRAY', 'HASH', or 'CODE'. -This will list all the glob names associated with the current package. -By inspecting the globs returned you can discern all the variables in -the package. +=item B<< $metapackage->get_all_package_symbols($type_filter) >> -By passing a C<$type_filter>, you can limit the list to only those -which match the filter (either SCALAR, ARRAY, HASH or CODE). +This works much like C, but it returns a +hash reference. The keys are glob names and the values are references +to the value for that name. -=item B +=item B<< Class::MOP::Package->meta >> -Works exactly like C but returns a HASH of -name => thing mapping instead of just an ARRAY of names. +This will return a L instance for this class. =back @@ -341,7 +250,7 @@ Stevan Little Estevan@iinteractive.comE =head1 COPYRIGHT AND LICENSE -Copyright 2006-2008 by Infinity Interactive, Inc. +Copyright 2006-2010 by Infinity Interactive, Inc. L