2 package Moose::Meta::Attribute;
7 use Scalar::Util 'blessed', 'weaken';
11 our $VERSION = '0.55';
12 our $AUTHORITY = 'cpan:STEVAN';
14 use Moose::Meta::Method::Accessor;
16 use Moose::Util::TypeConstraints ();
18 use base 'Class::MOP::Attribute';
20 # options which are not directly used
21 # but we store them for metadata purposes
22 __PACKAGE__->meta->add_attribute('isa' => (reader => '_isa_metadata'));
23 __PACKAGE__->meta->add_attribute('does' => (reader => '_does_metadata'));
24 __PACKAGE__->meta->add_attribute('is' => (reader => '_is_metadata'));
26 # these are actual options for the attrs
27 __PACKAGE__->meta->add_attribute('required' => (reader => 'is_required' ));
28 __PACKAGE__->meta->add_attribute('lazy' => (reader => 'is_lazy' ));
29 __PACKAGE__->meta->add_attribute('lazy_build' => (reader => 'is_lazy_build' ));
30 __PACKAGE__->meta->add_attribute('coerce' => (reader => 'should_coerce' ));
31 __PACKAGE__->meta->add_attribute('weak_ref' => (reader => 'is_weak_ref' ));
32 __PACKAGE__->meta->add_attribute('auto_deref' => (reader => 'should_auto_deref'));
33 __PACKAGE__->meta->add_attribute('type_constraint' => (
34 reader => 'type_constraint',
35 predicate => 'has_type_constraint',
37 __PACKAGE__->meta->add_attribute('trigger' => (
39 predicate => 'has_trigger',
41 __PACKAGE__->meta->add_attribute('handles' => (
43 predicate => 'has_handles',
45 __PACKAGE__->meta->add_attribute('documentation' => (
46 reader => 'documentation',
47 predicate => 'has_documentation',
49 __PACKAGE__->meta->add_attribute('traits' => (
50 reader => 'applied_traits',
51 predicate => 'has_applied_traits',
54 # we need to have a ->does method in here to
55 # more easily support traits, and the introspection
56 # of those traits. We extend the does check to look
57 # for metatrait aliases.
59 my ($self, $role_name) = @_;
61 Moose::Util::resolve_metatrait_alias(Attribute => $role_name)
63 return 0 if !defined($name); # failed to load class
64 return Moose::Object::does($self, $name);
68 my ($class, $name, %options) = @_;
69 $class->_process_options($name, \%options) unless $options{__hack_no_process_options}; # used from clone()... YECHKKK FIXME ICKY YUCK GROSS
70 return $class->SUPER::new($name, %options);
73 sub interpolate_class_and_new {
74 my ($class, $name, @args) = @_;
76 my ( $new_class, @traits ) = $class->interpolate_class(@args);
78 $new_class->new($name, @args, ( scalar(@traits) ? ( traits => \@traits ) : () ) );
81 sub interpolate_class {
82 my ($class, %options) = @_;
84 $class = ref($class) || $class;
86 if ( my $metaclass_name = delete $options{metaclass} ) {
87 my $new_class = Moose::Util::resolve_metaclass_alias( Attribute => $metaclass_name );
89 if ( $class ne $new_class ) {
90 if ( $new_class->can("interpolate_class") ) {
91 return $new_class->interpolate_class(%options);
100 if (my $traits = $options{traits}) {
101 if ( @traits = grep { not $class->does($_) } map {
102 Moose::Util::resolve_metatrait_alias( Attribute => $_ )
106 my $anon_class = Moose::Meta::Class->create_anon_class(
107 superclasses => [ $class ],
108 roles => [ @traits ],
112 $class = $anon_class->name;
116 return ( wantarray ? ( $class, @traits ) : $class );
121 my @legal_options_for_inheritance = qw(
122 default coerce required
123 documentation lazy handles
124 builder type_constraint
127 sub legal_options_for_inheritance { @legal_options_for_inheritance }
130 # This method *must* be able to handle
131 # Class::MOP::Attribute instances as
132 # well. Yes, I know that is wrong, but
133 # apparently we didn't realize it was
134 # doing that and now we have some code
135 # which is dependent on it. The real
136 # solution of course is to push this
137 # feature back up into Class::MOP::Attribute
138 # but I not right now, I am too lazy.
139 # However if you are reading this and
140 # looking for something to do,.. please
143 sub clone_and_inherit_options {
144 my ($self, %options) = @_;
151 # we may want to extends a Class::MOP::Attribute
152 # in which case we need to be able to use the
153 # core set of legal options that have always
154 # been here. But we allows Moose::Meta::Attribute
155 # instances to changes them.
157 my @legal_options = $self->can('legal_options_for_inheritance')
158 ? $self->legal_options_for_inheritance
159 : @legal_options_for_inheritance;
161 foreach my $legal_option (@legal_options) {
162 if (exists $options{$legal_option}) {
163 $actual_options{$legal_option} = $options{$legal_option};
164 delete $options{$legal_option};
170 if (blessed($options{isa}) && $options{isa}->isa('Moose::Meta::TypeConstraint')) {
171 $type_constraint = $options{isa};
174 $type_constraint = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options{isa});
175 (defined $type_constraint)
176 || confess "Could not find the type constraint '" . $options{isa} . "'";
179 $actual_options{type_constraint} = $type_constraint;
180 delete $options{isa};
183 if ($options{does}) {
185 if (blessed($options{does}) && $options{does}->isa('Moose::Meta::TypeConstraint')) {
186 $type_constraint = $options{does};
189 $type_constraint = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options{does});
190 (defined $type_constraint)
191 || confess "Could not find the type constraint '" . $options{does} . "'";
194 $actual_options{type_constraint} = $type_constraint;
195 delete $options{does};
199 # this doesn't apply to Class::MOP::Attributes,
200 # so we can ignore it for them.
202 if ($self->can('interpolate_class')) {
203 ( $actual_options{metaclass}, my @traits ) = $self->interpolate_class(%options);
206 my @all_traits = grep { $seen{$_}++ } @{ $self->applied_traits || [] }, @traits;
207 $actual_options{traits} = \@all_traits if @all_traits;
209 delete @options{qw(metaclass traits)};
212 (scalar keys %options == 0)
213 || confess "Illegal inherited options => (" . (join ', ' => keys %options) . ")";
216 $self->clone(%actual_options);
220 my ( $self, %params ) = @_;
222 my $class = $params{metaclass} || ref $self;
224 if ( 0 and $class eq ref $self ) {
225 return $self->SUPER::clone(%params);
227 my ( @init, @non_init );
229 foreach my $attr ( grep { $_->has_value($self) } $self->meta->compute_all_applicable_attributes ) {
230 push @{ $attr->has_init_arg ? \@init : \@non_init }, $attr;
233 my %new_params = ( ( map { $_->init_arg => $_->get_value($self) } @init ), %params );
235 my $name = delete $new_params{name};
237 my $clone = $class->new($name, %new_params, __hack_no_process_options => 1 );
239 foreach my $attr ( @non_init ) {
240 $attr->set_value($clone, $attr->get_value($self));
248 sub _process_options {
249 my ($class, $name, $options) = @_;
251 if (exists $options->{is}) {
253 ### -------------------------
254 ## is => ro, writer => _foo # turns into (reader => foo, writer => _foo) as before
255 ## is => rw, writer => _foo # turns into (reader => foo, writer => _foo)
256 ## is => rw, accessor => _foo # turns into (accessor => _foo)
257 ## is => ro, accessor => _foo # error, accesor is rw
258 ### -------------------------
260 if ($options->{is} eq 'ro') {
261 confess "Cannot define an accessor name on a read-only attribute, accessors are read/write"
262 if exists $options->{accessor};
263 $options->{reader} ||= $name;
265 elsif ($options->{is} eq 'rw') {
266 if ($options->{writer}) {
267 $options->{reader} ||= $name;
270 $options->{accessor} ||= $name;
274 confess "I do not understand this option (is => " . $options->{is} . ") on attribute ($name)"
278 if (exists $options->{isa}) {
279 if (exists $options->{does}) {
280 if (eval { $options->{isa}->can('does') }) {
281 ($options->{isa}->does($options->{does}))
282 || confess "Cannot have an isa option and a does option if the isa does not do the does on attribute ($name)";
285 confess "Cannot have an isa option which cannot ->does() on attribute ($name)";
289 # allow for anon-subtypes here ...
290 if (blessed($options->{isa}) && $options->{isa}->isa('Moose::Meta::TypeConstraint')) {
291 $options->{type_constraint} = $options->{isa};
294 $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options->{isa});
297 elsif (exists $options->{does}) {
298 # allow for anon-subtypes here ...
299 if (blessed($options->{does}) && $options->{does}->isa('Moose::Meta::TypeConstraint')) {
300 $options->{type_constraint} = $options->{does};
303 $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options->{does});
307 if (exists $options->{coerce} && $options->{coerce}) {
308 (exists $options->{type_constraint})
309 || confess "You cannot have coercion without specifying a type constraint on attribute ($name)";
310 confess "You cannot have a weak reference to a coerced value on attribute ($name)"
311 if $options->{weak_ref};
314 if (exists $options->{trigger}) {
315 ('CODE' eq ref $options->{trigger})
316 || confess "Trigger must be a CODE ref on attribute ($name)";
319 if (exists $options->{auto_deref} && $options->{auto_deref}) {
320 (exists $options->{type_constraint})
321 || confess "You cannot auto-dereference without specifying a type constraint on attribute ($name)";
322 ($options->{type_constraint}->is_a_type_of('ArrayRef') ||
323 $options->{type_constraint}->is_a_type_of('HashRef'))
324 || confess "You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)";
327 if (exists $options->{lazy_build} && $options->{lazy_build} == 1) {
328 confess("You can not use lazy_build and default for the same attribute ($name)")
329 if exists $options->{default};
330 $options->{lazy} = 1;
331 $options->{required} = 1;
332 $options->{builder} ||= "_build_${name}";
334 $options->{clearer} ||= "_clear${name}";
335 $options->{predicate} ||= "_has${name}";
338 $options->{clearer} ||= "clear_${name}";
339 $options->{predicate} ||= "has_${name}";
343 if (exists $options->{lazy} && $options->{lazy}) {
344 (exists $options->{default} || defined $options->{builder} )
345 || confess "You cannot have lazy attribute ($name) without specifying a default value for it";
348 if ( $options->{required} && !( ( !exists $options->{init_arg} || defined $options->{init_arg} ) || exists $options->{default} || defined $options->{builder} ) ) {
349 confess "You cannot have a required attribute ($name) without a default, builder, or an init_arg";
354 sub initialize_instance_slot {
355 my ($self, $meta_instance, $instance, $params) = @_;
356 my $init_arg = $self->init_arg();
357 # try to fetch the init arg from the %params ...
361 if ( defined($init_arg) and exists $params->{$init_arg}) {
362 $val = $params->{$init_arg};
366 # skip it if it's lazy
367 return if $self->is_lazy;
368 # and die if it's required and doesn't have a default value
369 confess "Attribute (" . $self->name . ") is required"
370 if $self->is_required && !$self->has_default && !$self->has_builder;
372 # if nothing was in the %params, we can use the
373 # attribute's default value (if it has one)
374 if ($self->has_default) {
375 $val = $self->default($instance);
378 elsif ($self->has_builder) {
379 if (my $builder = $instance->can($self->builder)){
380 $val = $instance->$builder;
384 confess(blessed($instance)." does not support builder method '".$self->builder."' for attribute '" . $self->name . "'");
389 return unless $value_is_set;
391 if ($self->has_type_constraint) {
392 my $type_constraint = $self->type_constraint;
393 if ($self->should_coerce && $type_constraint->has_coercion) {
394 $val = $type_constraint->coerce($val);
396 $type_constraint->check($val)
397 || confess "Attribute ("
399 . ") does not pass the type constraint because: "
400 . $type_constraint->get_message($val);
403 $self->set_initial_value($instance, $val);
404 $meta_instance->weaken_slot_value($instance, $self->name)
405 if ref $val && $self->is_weak_ref;
411 # this duplicates too much code from
412 # Class::MOP::Attribute, we need to
413 # refactor these bits eventually.
415 sub _set_initial_slot_value {
416 my ($self, $meta_instance, $instance, $value) = @_;
418 my $slot_name = $self->name;
420 return $meta_instance->set_slot_value($instance, $slot_name, $value)
421 unless $self->has_initializer;
423 my ($type_constraint, $can_coerce);
424 if ($self->has_type_constraint) {
425 $type_constraint = $self->type_constraint;
426 $can_coerce = ($self->should_coerce && $type_constraint->has_coercion);
431 if ($type_constraint) {
432 $val = $type_constraint->coerce($val)
434 $type_constraint->check($val)
435 || confess "Attribute ("
437 . ") does not pass the type constraint because: "
438 . $type_constraint->get_message($val);
440 $meta_instance->set_slot_value($instance, $slot_name, $val);
443 my $initializer = $self->initializer;
445 # most things will just want to set a value, so make it first arg
446 $instance->$initializer($value, $callback, $self);
450 my ($self, $instance, @args) = @_;
451 my $value = $args[0];
453 my $attr_name = $self->name;
455 if ($self->is_required and not @args) {
456 confess "Attribute ($attr_name) is required";
459 if ($self->has_type_constraint) {
461 my $type_constraint = $self->type_constraint;
463 if ($self->should_coerce) {
464 $value = $type_constraint->coerce($value);
466 $type_constraint->_compiled_type_constraint->($value)
467 || confess "Attribute ("
469 . ") does not pass the type constraint because "
470 . $type_constraint->get_message($value);
473 my $meta_instance = Class::MOP::Class->initialize(blessed($instance))
476 $meta_instance->set_slot_value($instance, $attr_name, $value);
478 if (ref $value && $self->is_weak_ref) {
479 $meta_instance->weaken_slot_value($instance, $attr_name);
482 if ($self->has_trigger) {
483 $self->trigger->($instance, $value, $self);
488 my ($self, $instance) = @_;
490 if ($self->is_lazy) {
491 unless ($self->has_value($instance)) {
492 if ($self->has_default) {
493 my $default = $self->default($instance);
494 $self->set_initial_value($instance, $default);
495 } elsif ( $self->has_builder ) {
496 if (my $builder = $instance->can($self->builder)){
497 $self->set_initial_value($instance, $instance->$builder);
500 confess(blessed($instance)
501 . " does not support builder method '"
503 . "' for attribute '"
509 $self->set_initial_value($instance, undef);
514 if ($self->should_auto_deref) {
516 my $type_constraint = $self->type_constraint;
518 if ($type_constraint->is_a_type_of('ArrayRef')) {
519 my $rv = $self->SUPER::get_value($instance);
520 return unless defined $rv;
521 return wantarray ? @{ $rv } : $rv;
523 elsif ($type_constraint->is_a_type_of('HashRef')) {
524 my $rv = $self->SUPER::get_value($instance);
525 return unless defined $rv;
526 return wantarray ? %{ $rv } : $rv;
529 confess "Can not auto de-reference the type constraint '" . $type_constraint->name . "'";
535 return $self->SUPER::get_value($instance);
539 ## installing accessors
541 sub accessor_metaclass { 'Moose::Meta::Method::Accessor' }
543 sub install_accessors {
545 $self->SUPER::install_accessors(@_);
546 $self->install_delegation if $self->has_handles;
550 sub install_delegation {
554 # Here we canonicalize the 'handles' option
555 # this will sort out any details and always
556 # return an hash of methods which we want
557 # to delagate to, see that method for details
558 my %handles = $self->_canonicalize_handles;
560 # find the accessor method for this attribute
561 my $accessor = $self->_get_delegate_accessor;
563 # install the delegation ...
564 my $associated_class = $self->associated_class;
565 foreach my $handle (keys %handles) {
566 my $method_to_call = $handles{$handle};
567 my $class_name = $associated_class->name;
568 my $name = "${class_name}::${handle}";
570 (!$associated_class->has_method($handle))
571 || confess "You cannot overwrite a locally defined method ($handle) with a delegation";
574 # handles is not allowed to delegate
575 # any of these methods, as they will
576 # override the ones in your class, which
577 # is almost certainly not what you want.
579 # FIXME warn when $handle was explicitly specified, but not if the source is a regex or something
580 #cluck("Not delegating method '$handle' because it is a core method") and
581 next if $class_name->isa("Moose::Object") and $handle =~ /^BUILD|DEMOLISH$/ || Moose::Object->can($handle);
583 if ('CODE' eq ref($method_to_call)) {
584 $associated_class->add_method($handle => Class::MOP::subname($name, $method_to_call));
588 # we used to do a goto here, but the
589 # goto didn't handle failure correctly
590 # (it just returned nothing), so I took
591 # that out. However, the more I thought
592 # about it, the less I liked it doing
593 # the goto, and I prefered the act of
594 # delegation being actually represented
595 # in the stack trace.
597 $associated_class->add_method($handle => Class::MOP::subname($name, sub {
598 my $proxy = (shift)->$accessor();
600 || confess "Cannot delegate $handle to $method_to_call because " .
601 "the value of " . $self->name . " is not defined";
602 $proxy->$method_to_call(@_);
608 # private methods to help delegation ...
610 sub _get_delegate_accessor {
612 # find the accessor method for this attribute
613 my $accessor = $self->get_read_method_ref;
614 # then unpack it if we need too ...
615 $accessor = $accessor->body if blessed $accessor;
616 # return the accessor
620 sub _canonicalize_handles {
622 my $handles = $self->handles;
623 if (my $handle_type = ref($handles)) {
624 if ($handle_type eq 'HASH') {
627 elsif ($handle_type eq 'ARRAY') {
628 return map { $_ => $_ } @{$handles};
630 elsif ($handle_type eq 'Regexp') {
631 ($self->has_type_constraint)
632 || confess "Cannot delegate methods based on a RegExpr without a type constraint (isa)";
633 return map { ($_ => $_) }
634 grep { /$handles/ } $self->_get_delegate_method_list;
636 elsif ($handle_type eq 'CODE') {
637 return $handles->($self, $self->_find_delegate_metaclass);
640 confess "Unable to canonicalize the 'handles' option with $handles";
644 my $role_meta = eval { $handles->meta };
646 confess "Unable to canonicalize the 'handles' option with $handles because : $@";
649 (blessed $role_meta && $role_meta->isa('Moose::Meta::Role'))
650 || confess "Unable to canonicalize the 'handles' option with $handles because ->meta is not a Moose::Meta::Role";
652 return map { $_ => $_ } (
653 $role_meta->get_method_list,
654 $role_meta->get_required_method_list
659 sub _find_delegate_metaclass {
661 if (my $class = $self->_isa_metadata) {
662 # if the class does have
663 # a meta method, use it
664 return $class->meta if $class->can('meta');
665 # otherwise we might be
666 # dealing with a non-Moose
667 # class, and need to make
669 return Moose::Meta::Class->initialize($class);
671 elsif (my $role = $self->_does_metadata) {
672 # our role will always have
677 confess "Cannot find delegate metaclass for attribute " . $self->name;
681 sub _get_delegate_method_list {
683 my $meta = $self->_find_delegate_metaclass;
684 if ($meta->isa('Class::MOP::Class')) {
685 return map { $_->{name} } # NOTE: !never! delegate &meta
686 grep { $_->{class} ne 'Moose::Object' && $_->{name} ne 'meta' }
687 $meta->compute_all_applicable_methods;
689 elsif ($meta->isa('Moose::Meta::Role')) {
690 return $meta->get_method_list;
693 confess "Unable to recognize the delegate metaclass '$meta'";
697 package Moose::Meta::Attribute::Custom::Moose;
698 sub register_implementation { 'Moose::Meta::Attribute' }
708 Moose::Meta::Attribute - The Moose attribute metaclass
712 This is a subclass of L<Class::MOP::Attribute> with Moose specific
715 For the most part, the only time you will ever encounter an
716 instance of this class is if you are doing some serious deep
717 introspection. To really understand this class, you need to refer
718 to the L<Class::MOP::Attribute> documentation.
722 =head2 Overridden methods
724 These methods override methods in L<Class::MOP::Attribute> and add
725 Moose specific features. You can safely assume though that they
726 will behave just as L<Class::MOP::Attribute> does.
736 =item B<initialize_instance_slot>
738 =item B<install_accessors>
740 =item B<install_delegation>
742 =item B<accessor_metaclass>
748 eval { $point->meta->get_attribute('x')->set_value($point, 'fourty-two') };
753 I<Attribute (x) does not pass the type constraint (Int) with 'fourty-two'>
755 Before setting the value, a check is made on the type constraint of
756 the attribute, if it has one, to see if the value passes it. If the
757 value fails to pass, the set operation dies with a L<Carp/confess>.
759 Any coercion to convert values is done before checking the type constraint.
761 To check a value against a type constraint before setting it, fetch the
762 attribute instance using L<Class::MOP::Class/find_attribute_by_name>,
763 fetch the type_constraint from the attribute using L<Moose::Meta::Attribute/type_constraint>
764 and call L<Moose::Meta::TypeConstraint/check>. See L<Moose::Cookbook::Basics::Recipe4>
769 =head2 Additional Moose features
771 Moose attributes support type-constraint checking, weak reference
772 creation and type coercion.
776 =item B<interpolate_class_and_new>
778 =item B<interpolate_class>
780 When called as a class method causes interpretation of the C<metaclass> and
783 =item B<clone_and_inherit_options>
785 This is to support the C<has '+foo'> feature, it clones an attribute
786 from a superclass and allows a very specific set of changes to be made
789 =item B<legal_options_for_inheritance>
791 Whitelist with options you can change. You can overload it in your custom
792 metaclass to allow your options be inheritable.
794 =item B<has_type_constraint>
796 Returns true if this meta-attribute has a type constraint.
798 =item B<type_constraint>
800 A read-only accessor for this meta-attribute's type constraint. For
801 more information on what you can do with this, see the documentation
802 for L<Moose::Meta::TypeConstraint>.
806 Returns true if this meta-attribute performs delegation.
810 This returns the value which was passed into the handles option.
814 Returns true if this meta-attribute produces a weak reference.
818 Returns true if this meta-attribute is required to have a value.
822 Returns true if this meta-attribute should be initialized lazily.
824 NOTE: lazy attributes, B<must> have a C<default> or C<builder> field set.
826 =item B<is_lazy_build>
828 Returns true if this meta-attribute should be initialized lazily through
829 the builder generated by lazy_build. Using C<lazy_build =E<gt> 1> will
830 make your attribute required and lazy. In addition it will set the builder, clearer
831 and predicate options for you using the following convention.
833 #If your attribute name starts with an underscore:
834 has '_foo' => (lazy_build => 1);
836 has '_foo' => (lazy => 1, required => 1, predicate => '_has_foo', clearer => '_clear_foo', builder => '_build__foo');
838 has '_foo' => (lazy => 1, required => 1, predicate => '_has_foo', clearer => '_clear_foo', default => sub{shift->_build__foo});
840 #If your attribute name does not start with an underscore:
841 has 'foo' => (lazy_build => 1);
843 has 'foo' => (lazy => 1, required => 1, predicate => 'has_foo', clearer => 'clear_foo', builder => '_build_foo');
845 has 'foo' => (lazy => 1, required => 1, predicate => 'has_foo', clearer => 'clear_foo', default => sub{shift->_build_foo});
847 The reason for the different naming of the C<builder> is that the C<builder>
848 method is a private method while the C<clearer> and C<predicate> methods
851 NOTE: This means your class should provide a method whose name matches the value
852 of the builder part, in this case _build__foo or _build_foo.
854 =item B<should_coerce>
856 Returns true if this meta-attribute should perform type coercion.
858 =item B<should_auto_deref>
860 Returns true if this meta-attribute should perform automatic
863 NOTE: This can only be done for attributes whose type constraint is
864 either I<ArrayRef> or I<HashRef>.
868 Returns true if this meta-attribute has a trigger set.
872 This is a CODE reference which will be executed every time the
873 value of an attribute is assigned. The CODE ref will get two values,
874 the invocant and the new value. This can be used to handle I<basic>
875 bi-directional relations.
877 =item B<documentation>
879 This is a string which contains the documentation for this attribute.
880 It serves no direct purpose right now, but it might in the future
881 in some kind of automated documentation system perhaps.
883 =item B<has_documentation>
885 Returns true if this meta-attribute has any documentation.
887 =item B<applied_traits>
889 This will return the ARRAY ref of all the traits applied to this
890 attribute, or if no traits have been applied, it returns C<undef>.
892 =item B<has_applied_traits>
894 Returns true if this meta-attribute has any traits applied.
900 All complex software has bugs lurking in it, and this module is no
901 exception. If you find a bug please either email me, or add the bug
906 Stevan Little E<lt>stevan@iinteractive.comE<gt>
908 Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
910 =head1 COPYRIGHT AND LICENSE
912 Copyright 2006-2008 by Infinity Interactive, Inc.
914 L<http://www.iinteractive.com>
916 This library is free software; you can redistribute it and/or modify
917 it under the same terms as Perl itself.