X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FClass%2FMOP%2FClass.pm;h=82b4744daa960a94f9a26ff6df3cbb154d0ccffb;hb=cbd9f94236f2c6be75aafbf52b796c754bc4d941;hp=277a2127166c519c2136b3015eba8fd5e8749c93;hpb=bfe4d0fc35c0b24b568cf6a0b4620a0df2aed649;p=gitmo%2FClass-MOP.git
diff --git a/lib/Class/MOP/Class.pm b/lib/Class/MOP/Class.pm
index 277a212..82b4744 100644
--- a/lib/Class/MOP/Class.pm
+++ b/lib/Class/MOP/Class.pm
@@ -11,6 +11,10 @@ use B 'svref_2object';
our $VERSION = '0.01';
+# Self-introspection
+
+sub meta { $_[0]->initialize($_[0]) }
+
# Creation
{
@@ -23,7 +27,10 @@ our $VERSION = '0.01';
my ($class, $package_name) = @_;
(defined $package_name && $package_name)
|| confess "You must pass a package name";
- $METAS{$package_name} ||= bless \$package_name => blessed($class) || $class;
+ $METAS{$package_name} ||= bless {
+ '$:pkg' => $package_name,
+ '%:attrs' => {}
+ } => blessed($class) || $class;
}
}
@@ -39,17 +46,48 @@ sub create {
my $meta = $class->initialize($package_name);
$meta->superclasses(@{$options{superclasses}})
if exists $options{superclasses};
+ # NOTE:
+ # process attributes first, so that they can
+ # install accessors, but locally defined methods
+ # can then overwrite them. It is maybe a little odd, but
+ # I think this should be the order of things.
+ if (exists $options{attributes}) {
+ foreach my $attr (@{$options{attributes}}) {
+ $meta->add_attribute($attr);
+ }
+ }
if (exists $options{methods}) {
foreach my $method_name (keys %{$options{methods}}) {
$meta->add_method($method_name, $options{methods}->{$method_name});
}
- }
+ }
return $meta;
}
+# Instance Construction
+
+sub construct_instance {
+ my ($class, %params) = @_;
+ my $instance = {};
+ foreach my $attr (map { $_->{attribute} } $class->compute_all_applicable_attributes()) {
+ # if the attr has an init_arg, use that, otherwise,
+ # use the attributes name itself as the init_arg
+ my $init_arg = $attr->has_init_arg() ? $attr->init_arg() : $attr->name;
+ # try to fetch the init arg from the %params ...
+ my $val;
+ $val = $params{$init_arg} if exists $params{$init_arg};
+ # if nothing was in the %params, we can use the
+ # attribute's default value (if it has one)
+ $val ||= $attr->default() if $attr->has_default();
+ # now add this to the instance structure
+ $instance->{$attr->name} = $val;
+ }
+ return $instance;
+}
+
# Informational
-sub name { ${$_[0]} }
+sub name { $_[0]->{'$:pkg'} }
sub version {
my $self = shift;
@@ -92,22 +130,24 @@ sub add_method {
my ($self, $method_name, $method) = @_;
(defined $method_name && $method_name)
|| confess "You must define a method name";
+ # use reftype here to allow for blessed subs ...
(reftype($method) && reftype($method) eq 'CODE')
|| confess "Your code block must be a CODE reference";
my $full_method_name = ($self->name . '::' . $method_name);
no strict 'refs';
+ no warnings 'redefine';
*{$full_method_name} = subname $full_method_name => $method;
}
{
## private utility functions for has_method
- my $_find_subroutine_package_name = sub { eval { svref_2object($_[0])->GV->STASH->NAME } };
- my $_find_subroutine_name = sub { eval { svref_2object($_[0])->GV->NAME } };
+ my $_find_subroutine_package_name = sub { eval { svref_2object($_[0])->GV->STASH->NAME } || '' };
+ my $_find_subroutine_name = sub { eval { svref_2object($_[0])->GV->NAME } || '' };
sub has_method {
- my ($self, $method_name, $method) = @_;
+ my ($self, $method_name) = @_;
(defined $method_name && $method_name)
|| confess "You must define a method name";
@@ -123,16 +163,155 @@ sub add_method {
}
sub get_method {
- my ($self, $method_name, $method) = @_;
+ my ($self, $method_name) = @_;
(defined $method_name && $method_name)
|| confess "You must define a method name";
no strict 'refs';
return \&{$self->name . '::' . $method_name}
if $self->has_method($method_name);
- return; # <--- make sure to return undef
+ return; # <- make sure to return undef
+}
+
+sub remove_method {
+ my ($self, $method_name) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must define a method name";
+
+ my $removed_method = $self->get_method($method_name);
+
+ no strict 'refs';
+ delete ${$self->name . '::'}{$method_name}
+ if defined $removed_method;
+
+ return $removed_method;
+}
+
+sub get_method_list {
+ my $self = shift;
+ no strict 'refs';
+ grep { $self->has_method($_) } %{$self->name . '::'};
+}
+
+sub compute_all_applicable_methods {
+ my $self = shift;
+ my @methods;
+ # keep a record of what we have seen
+ # here, this will handle all the
+ # inheritence issues because we are
+ # using the &class_precedence_list
+ my (%seen_class, %seen_method);
+ foreach my $class ($self->class_precedence_list()) {
+ next if $seen_class{$class};
+ $seen_class{$class}++;
+ # fetch the meta-class ...
+ my $meta = $self->initialize($class);
+ foreach my $method_name ($meta->get_method_list()) {
+ next if exists $seen_method{$method_name};
+ $seen_method{$method_name}++;
+ push @methods => {
+ name => $method_name,
+ class => $class,
+ code => $meta->get_method($method_name)
+ };
+ }
+ }
+ return @methods;
+}
+
+sub find_all_methods_by_name {
+ my ($self, $method_name) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must define a method name to find";
+ my @methods;
+ # keep a record of what we have seen
+ # here, this will handle all the
+ # inheritence issues because we are
+ # using the &class_precedence_list
+ my %seen_class;
+ foreach my $class ($self->class_precedence_list()) {
+ next if $seen_class{$class};
+ $seen_class{$class}++;
+ # fetch the meta-class ...
+ my $meta = $self->initialize($class);
+ push @methods => {
+ name => $method_name,
+ class => $class,
+ code => $meta->get_method($method_name)
+ } if $meta->has_method($method_name);
+ }
+ return @methods;
+
+}
+
+## Attributes
+
+sub add_attribute {
+ my ($self,$attribute) = @_;
+ (blessed($attribute) && $attribute->isa('Class::MOP::Attribute'))
+ || confess "Your attribute must be an instance of Class::MOP::Attribute (or a subclass)";
+ $attribute->install_accessors($self);
+ $self->{'%:attrs'}->{$attribute->name} = $attribute;
}
+sub has_attribute {
+ my ($self, $attribute_name) = @_;
+ (defined $attribute_name && $attribute_name)
+ || confess "You must define an attribute name";
+ exists $self->{'%:attrs'}->{$attribute_name} ? 1 : 0;
+}
+
+sub get_attribute {
+ my ($self, $attribute_name) = @_;
+ (defined $attribute_name && $attribute_name)
+ || confess "You must define an attribute name";
+ return $self->{'%:attrs'}->{$attribute_name}
+ if $self->has_attribute($attribute_name);
+}
+
+sub remove_attribute {
+ my ($self, $attribute_name) = @_;
+ (defined $attribute_name && $attribute_name)
+ || confess "You must define an attribute name";
+ my $removed_attribute = $self->{'%:attrs'}->{$attribute_name};
+ delete $self->{'%:attrs'}->{$attribute_name}
+ if defined $removed_attribute;
+ $removed_attribute->remove_accessors($self);
+ return $removed_attribute;
+}
+
+sub get_attribute_list {
+ my $self = shift;
+ keys %{$self->{'%:attrs'}};
+}
+
+sub compute_all_applicable_attributes {
+ my $self = shift;
+ my @attrs;
+ # keep a record of what we have seen
+ # here, this will handle all the
+ # inheritence issues because we are
+ # using the &class_precedence_list
+ my (%seen_class, %seen_attr);
+ foreach my $class ($self->class_precedence_list()) {
+ next if $seen_class{$class};
+ $seen_class{$class}++;
+ # fetch the meta-class ...
+ my $meta = $self->initialize($class);
+ foreach my $attr_name ($meta->get_attribute_list()) {
+ next if exists $seen_attr{$attr_name};
+ $seen_attr{$attr_name}++;
+ push @attrs => {
+ name => $attr_name,
+ class => $class,
+ attribute => $meta->get_attribute($attr_name)
+ };
+ }
+ }
+ return @attrs;
+}
+
+
1;
__END__
@@ -147,6 +326,226 @@ Class::MOP::Class - Class Meta Object
=head1 DESCRIPTION
+=head1 METHODS
+
+=head2 Self Introspection
+
+=over 4
+
+=item B
+
+This allows Class::MOP::Class to actually introspect itself.
+
+=back
+
+=head2 Class construction
+
+These methods handle creating Class objects, which can be used to
+both create new classes, and analyze pre-existing ones.
+
+This module will internally store references to all the instances
+you create with these methods, so that they do not need to be
+created any more than nessecary. Basically, they are singletons.
+
+=over 4
+
+=item B ?@superclasses,
+ methods => ?%methods,
+ attributes => ?%attributes)>
+
+This returns the basic Class object, bringing the specified
+C<$package_name> into existence and adding any of the
+C<$package_version>, C<@superclasses>, C<%methods> and C<%attributes>
+to it.
+
+=item B
+
+This initializes a Class object for a given a C<$package_name>.
+
+=back
+
+=head2 Instance construction
+
+=over 4
+
+=item B
+
+This will construct and instance using a HASH ref as storage
+(currently only HASH references are supported). This will collect all
+the applicable attribute meta-objects and layout out the fields in the
+HASH ref, it will then initialize them using either use the
+corresponding key in C<%params> or any default value or initializer
+found in the attribute meta-object.
+
+=back
+
+=head2 Informational
+
+=over 4
+
+=item B
+
+This is a read-only attribute which returns the package name that
+the Class is stored in.
+
+=item B
+
+This is a read-only attribute which returns the C<$VERSION> of the
+package the Class is stored in.
+
+=back
+
+=head2 Inheritance Relationships
+
+=over 4
+
+=item B
+
+This is a read-write attribute which represents the superclass
+relationships of this Class. Basically, it can get and set the
+C<@ISA> for you.
+
+=item B
+
+This computes the a list of the Class's ancestors in the same order
+in which method dispatch will be done.
+
+=back
+
+=head2 Methods
+
+=over 4
+
+=item B
+
+This will take a C<$method_name> and CODE reference to that
+C<$method> and install it into the Class.
+
+B : This does absolutely nothing special to C<$method>
+other than use B to make sure it is tagged with the
+correct name, and therefore show up correctly in stack traces and
+such.
+
+=item B
+
+This just provides a simple way to check if the Class implements
+a specific C<$method_name>. It will I however, attempt to check
+if the class inherits the method.
+
+This will correctly handle functions defined outside of the package
+that use a fully qualified name (C).
+
+This will correctly handle functions renamed with B and
+installed using the symbol tables. However, if you are naming the
+subroutine outside of the package scope, you must use the fully
+qualified name, including the package name, for C to
+correctly identify it.
+
+This will attempt to correctly ignore functions imported from other
+packages using B. It breaks down if the function imported
+is an C<__ANON__> sub (such as with C