use Scalar::Util 'blessed', 'weaken', 'reftype';
use Carp 'confess';
-our $VERSION = '0.06';
+our $VERSION = '0.11';
+our $AUTHORITY = 'cpan:STEVAN';
+use Moose::Meta::Method::Accessor;
use Moose::Util::TypeConstraints ();
use base 'Class::MOP::Attribute';
reader => 'handles',
predicate => 'has_handles',
));
+__PACKAGE__->meta->add_attribute('documentation' => (
+ reader => 'documentation',
+ predicate => 'has_documentation',
+));
sub new {
my ($class, $name, %options) = @_;
sub clone_and_inherit_options {
my ($self, %options) = @_;
- # you can change default, required and coerce
+ # you can change default, required, coerce, documentation and lazy
my %actual_options;
- foreach my $legal_option (qw(default coerce required)) {
+ foreach my $legal_option (qw(default coerce required documentation lazy)) {
if (exists $options{$legal_option}) {
$actual_options{$legal_option} = $options{$legal_option};
delete $options{$legal_option};
}
}
+
+ # handles can only be added, not changed
+ if ($options{handles}) {
+ confess "You can only add the 'handles' option, you cannot change it"
+ if $self->has_handles;
+ $actual_options{handles} = $options{handles};
+ delete $options{handles};
+ }
+
# isa can be changed, but only if the
# new type is a subtype
if ($options{isa}) {
(defined $type_constraint)
|| confess "Could not find the type constraint '" . $options{isa} . "'";
}
+ # NOTE:
+ # check here to see if the new type
+ # is a subtype of the old one
($type_constraint->is_subtype_of($self->type_constraint->name))
|| confess "New type constraint setting must be a subtype of inherited one"
+ # iff we have a type constraint that is ...
if $self->has_type_constraint;
+ # then we use it :)
$actual_options{type_constraint} = $type_constraint;
delete $options{isa};
}
if (exists $options->{is}) {
if ($options->{is} eq 'ro') {
- $options->{reader} = $name;
+ $options->{reader} ||= $name;
(!exists $options->{trigger})
|| confess "Cannot have a trigger on a read-only attribute";
}
if (exists $options->{coerce} && $options->{coerce}) {
(exists $options->{type_constraint})
- || confess "You cannot have coercion without specifying a type constraint";
- (!$options->{type_constraint}->isa('Moose::Meta::TypeConstraint::Union'))
- || confess "You cannot have coercion with a type constraint union";
+ || confess "You cannot have coercion without specifying a type constraint";
confess "You cannot have a weak reference to a coerced value"
if $options->{weak_ref};
}
if (exists $options->{auto_deref} && $options->{auto_deref}) {
(exists $options->{type_constraint})
|| confess "You cannot auto-dereference without specifying a type constraint";
- ($options->{type_constraint}->name =~ /^ArrayRef|HashRef$/)
+ ($options->{type_constraint}->is_a_type_of('ArrayRef') ||
+ $options->{type_constraint}->is_a_type_of('HashRef'))
|| confess "You cannot auto-dereference anything other than a ArrayRef or HashRef";
}
- if (exists $options->{type_constraint} && $options->{type_constraint}->name =~ /^ArrayRef|HashRef$/) {
- unless (exists $options->{default}) {
- $options->{default} = sub { [] } if $options->{type_constraint}->name eq 'ArrayRef';
- $options->{default} = sub { {} } if $options->{type_constraint}->name eq 'HashRef';
- }
- }
-
if (exists $options->{lazy} && $options->{lazy}) {
(exists $options->{default})
|| confess "You cannot have lazy attribute without specifying a default value for it";
if (!defined $val && $self->has_default) {
$val = $self->default($instance);
}
+
if (defined $val) {
if ($self->has_type_constraint) {
my $type_constraint = $self->type_constraint;
if ($self->should_coerce && $type_constraint->has_coercion) {
- $val = $type_constraint->coercion->coerce($val);
+ $val = $type_constraint->coerce($val);
}
(defined($type_constraint->check($val)))
|| confess "Attribute (" .
if ref $val && $self->is_weak_ref;
}
-## Accessor inline subroutines
-
-sub _inline_check_constraint {
- my ($self, $value) = @_;
- return '' unless $self->has_type_constraint;
-
- # FIXME - remove 'unless defined($value) - constraint Undef
- return sprintf <<'EOF', $value, $value, $value, $value
-defined($attr->type_constraint->check(%s))
- || confess "Attribute (" . $attr->name . ") does not pass the type constraint ("
- . $attr->type_constraint->name . ") with " . (defined(%s) ? "'%s'" : "undef")
- if defined(%s);
-EOF
-}
-
-sub _inline_check_coercion {
- my $self = shift;
- return '' unless $self->should_coerce;
- return 'my $val = $attr->type_constraint->coercion->coerce($_[1]);'
-}
-
-sub _inline_check_required {
- my $self = shift;
- return '' unless $self->is_required;
- return 'defined($_[1]) || confess "Attribute ($attr_name) is required, so cannot be set to undef";'
-}
-
-sub _inline_check_lazy {
- my $self = shift;
- return '' unless $self->is_lazy;
- return '$_[0]->{$attr_name} = ($attr->has_default ? $attr->default($_[0]) : undef)'
- . 'unless exists $_[0]->{$attr_name};';
-}
+## Slot management
-
-sub _inline_store {
- my ($self, $instance, $value) = @_;
-
- my $mi = $self->associated_class->get_meta_instance;
- my $slot_name = sprintf "'%s'", $self->slots;
-
- my $code = $mi->inline_set_slot_value($instance, $slot_name, $value) . ";";
- $code .= $mi->inline_weaken_slot_value($instance, $slot_name, $value) . ";"
- if $self->is_weak_ref;
- return $code;
-}
-
-sub _inline_trigger {
- my ($self, $instance, $value) = @_;
- return '' unless $self->has_trigger;
- return sprintf('$attr->trigger->(%s, %s, $attr);', $instance, $value);
-}
-
-sub _inline_get {
- my ($self, $instance) = @_;
-
- my $mi = $self->associated_class->get_meta_instance;
- my $slot_name = sprintf "'%s'", $self->slots;
-
- return $mi->inline_get_slot_value($instance, $slot_name);
-}
-
-sub _inline_auto_deref {
- my ( $self, $ref_value ) = @_;
-
- return $ref_value unless $self->should_auto_deref;
-
- my $type = $self->type_constraint->name;
-
- my $sigil;
- if ($type eq "ArrayRef") {
- $sigil = '@';
- }
- elsif ($type eq 'HashRef') {
- $sigil = '%';
- }
- else {
- confess "Can not auto de-reference the type constraint '$type'";
+sub set_value {
+ my ($self, $instance, $value) = @_;
+
+ my $attr_name = $self->name;
+
+ if ($self->is_required) {
+ defined($value)
+ || confess "Attribute ($attr_name) is required, so cannot be set to undef";
+ }
+
+ if ($self->has_type_constraint) {
+
+ my $type_constraint = $self->type_constraint;
+
+ if ($self->should_coerce) {
+ $value = $type_constraint->coerce($value);
+ }
+ defined($type_constraint->_compiled_type_constraint->($value))
+ || confess "Attribute ($attr_name) does not pass the type constraint ("
+ . $type_constraint->name . ") with " . (defined($value) ? ("'" . $value . "'") : "undef")
+ if defined($value);
+ }
+
+ my $meta_instance = Class::MOP::Class->initialize(blessed($instance))
+ ->get_meta_instance;
+
+ $meta_instance->set_slot_value($instance, $attr_name, $value);
+
+ if (ref $value && $self->is_weak_ref) {
+ $meta_instance->weaken_slot_value($instance, $attr_name);
+ }
+
+ if ($self->has_trigger) {
+ $self->trigger->($instance, $value, $self);
}
-
- "(wantarray() ? $sigil\{ ( $ref_value ) || return } : ( $ref_value ) )";
}
-sub generate_accessor_method {
- my ($attr, $attr_name) = @_;
- my $value_name = $attr->should_coerce ? '$val' : '$_[1]';
- my $mi = $attr->associated_class->get_meta_instance;
- my $slot_name = sprintf "'%s'", $attr->slots;
- my $inv = '$_[0]';
- my $code = 'sub { '
- . 'if (scalar(@_) == 2) {'
- . $attr->_inline_check_required
- . $attr->_inline_check_coercion
- . $attr->_inline_check_constraint($value_name)
- . $attr->_inline_store($inv, $value_name)
- . $attr->_inline_trigger($inv, $value_name)
- . ' }'
- . $attr->_inline_check_lazy
- . 'return ' . $attr->_inline_auto_deref($attr->_inline_get($inv))
- . ' }';
- my $sub = eval $code;
- confess "Could not create accessor for '$attr_name' because $@ \n code: $code" if $@;
- return $sub;
+sub get_value {
+ my ($self, $instance) = @_;
+
+ if ($self->is_lazy) {
+ unless ($self->has_value($instance)) {
+ if ($self->has_default) {
+ my $default = $self->default($instance);
+ $self->set_value($instance, $default);
+ }
+ else {
+ $self->set_value($instance, undef);
+ }
+ }
+ }
+
+ if ($self->should_auto_deref) {
+
+ my $type_constraint = $self->type_constraint;
+
+ if ($type_constraint->is_a_type_of('ArrayRef')) {
+ my $rv = $self->SUPER::get_value($instance);
+ return unless defined $rv;
+ return wantarray ? @{ $rv } : $rv;
+ }
+ elsif ($type_constraint->is_a_type_of('HashRef')) {
+ my $rv = $self->SUPER::get_value($instance);
+ return unless defined $rv;
+ return wantarray ? %{ $rv } : $rv;
+ }
+ else {
+ confess "Can not auto de-reference the type constraint '" . $type_constraint->name . "'";
+ }
+
+ }
+ else {
+
+ return $self->SUPER::get_value($instance);
+ }
}
-sub generate_writer_method {
- my ($attr, $attr_name) = @_;
- my $value_name = $attr->should_coerce ? '$val' : '$_[1]';
- my $inv = '$_[0]';
- my $code = 'sub { '
- . $attr->_inline_check_required
- . $attr->_inline_check_coercion
- . $attr->_inline_check_constraint($value_name)
- . $attr->_inline_store($inv, $value_name)
- . $attr->_inline_trigger($inv, $value_name)
- . ' }';
- my $sub = eval $code;
- confess "Could not create writer for '$attr_name' because $@ \n code: $code" if $@;
- return $sub;
-}
+## installing accessors
-sub generate_reader_method {
- my $attr = shift;
- my $attr_name = $attr->slots;
- my $code = 'sub {'
- . 'confess "Cannot assign a value to a read-only accessor" if @_ > 1;'
- . $attr->_inline_check_lazy
- . 'return ' . $attr->_inline_auto_deref( '$_[0]->{$attr_name}' ) . ';'
- . '}';
- my $sub = eval $code;
- confess "Could not create reader for '$attr_name' because $@ \n code: $code" if $@;
- return $sub;
-}
+sub accessor_metaclass { 'Moose::Meta::Method::Accessor' }
sub install_accessors {
my $self = shift;
(!$associated_class->has_method($handle))
|| confess "You cannot overwrite a locally defined method ($handle) with a delegation";
+ # NOTE:
+ # handles is not allowed to delegate
+ # any of these methods, as they will
+ # override the ones in your class, which
+ # is almost certainly not what you want.
+ next if $handle =~ /^BUILD|DEMOLISH$/ || Moose::Object->can($handle);
+
if ((reftype($method_to_call) || '') eq 'CODE') {
$associated_class->add_method($handle => $method_to_call);
}
# we should check for lack of
# a callable return value from
# the accessor here
- ((shift)->$accessor_name())->$method_to_call(@_);
+ my $proxy = (shift)->$accessor_name();
+ @_ = ($proxy, @_);
+ goto &{ $proxy->can($method_to_call)};
});
}
}
sub _canonicalize_handles {
my $self = shift;
my $handles = $self->handles;
- if (ref($handles) eq 'HASH') {
- return %{$handles};
- }
- elsif (ref($handles) eq 'ARRAY') {
- return map { $_ => $_ } @{$handles};
- }
- elsif (ref($handles) eq 'Regexp') {
- ($self->has_type_constraint)
- || confess "Cannot delegate methods based on a RegExpr without a type constraint (isa)";
- return map { ($_ => $_) }
- grep { $handles } $self->_get_delegate_method_list;
- }
- elsif (ref($handles) eq 'CODE') {
- return $handles->($self, $self->_find_delegate_metaclass);
+ if (my $handle_type = ref($handles)) {
+ if ($handle_type eq 'HASH') {
+ return %{$handles};
+ }
+ elsif ($handle_type eq 'ARRAY') {
+ return map { $_ => $_ } @{$handles};
+ }
+ elsif ($handle_type eq 'Regexp') {
+ ($self->has_type_constraint)
+ || confess "Cannot delegate methods based on a RegExpr without a type constraint (isa)";
+ return map { ($_ => $_) }
+ grep { /$handles/ } $self->_get_delegate_method_list;
+ }
+ elsif ($handle_type eq 'CODE') {
+ return $handles->($self, $self->_find_delegate_metaclass);
+ }
+ else {
+ confess "Unable to canonicalize the 'handles' option with $handles";
+ }
}
else {
- confess "Unable to canonicalize the 'handles' option with $handles";
+ my $role_meta = eval { $handles->meta };
+ if ($@) {
+ confess "Unable to canonicalize the 'handles' option with $handles because : $@";
+ }
+
+ (blessed $role_meta && $role_meta->isa('Moose::Meta::Role'))
+ || confess "Unable to canonicalize the 'handles' option with $handles because ->meta is not a Moose::Meta::Role";
+
+ return map { $_ => $_ } (
+ $role_meta->get_method_list,
+ $role_meta->get_required_method_list
+ );
}
}
=item B<initialize_instance_slot>
-=item B<generate_accessor_method>
+=item B<install_accessors>
-=item B<generate_writer_method>
+=item B<accessor_metaclass>
-=item B<generate_reader_method>
+=item B<get_value>
-=item B<install_accessors>
+=item B<set_value>
=back
the invocant and the new value. This can be used to handle I<basic>
bi-directional relations.
+=item B<documentation>
+
+This is a string which contains the documentation for this attribute.
+It serves no direct purpose right now, but it might in the future
+in some kind of automated documentation system perhaps.
+
+=item B<has_documentation>
+
+Returns true if this meta-attribute has any documentation.
+
=back
=head1 BUGS
=head1 COPYRIGHT AND LICENSE
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006, 2007 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
projects / gitmo/Moose.git / blobdiff