2 package MooseX::Singleton::Meta::Method::Constructor;
5 extends 'Moose::Meta::Method::Constructor';
10 # the %options should also include a both
11 # a call 'initializer' and call 'SUPER::'
12 # options, which should cover approx 90%
13 # of the possible use cases (even if it
14 # requires some adaption on the part of
15 # the author, after all, nothing is free)
16 my $source = "use Carp qw( confess );\n";
18 $source .= "\n" . 'my $class = shift;';
20 $source .= "\n" . 'my $existing = do { no strict "refs"; \${"$class\::singleton"}; };';
21 $source .= "\n" . 'return ${$existing} if ${$existing};';
23 $source .= "\n" . 'return $class->Moose::Object::new(@_)';
24 $source .= "\n" . ' if $class ne \'' . $self->associated_metaclass->name . '\';';
26 $source .= "\n" . 'my $params = ' . $self->_generate_BUILDARGS('$class', '@_');
28 $source .= ";\n" . 'my $instance = ' . $self->meta_instance->inline_create_instance('$class');
30 $source .= ";\n" . (join ";\n" => map {
31 $self->_generate_slot_initializer($_)
32 } 0 .. (@{$self->attributes} - 1));
34 $source .= ";\n" . $self->_generate_triggers();
35 $source .= ";\n" . $self->_generate_BUILDALL();
37 $source .= ";\n" . 'return ${$existing} = $instance';
38 $source .= ";\n" . '}';
39 warn $source if $self->options->{debug};
44 # create the nessecary lexicals
45 # to be picked up in the eval
46 my $attrs = $self->attributes;
48 # We need to check if the attribute ->can('type_constraint')
49 # since we may be trying to immutabilize a Moose meta class,
50 # which in turn has attributes which are Class::MOP::Attribute
51 # objects, rather than Moose::Meta::Attribute. And
52 # Class::MOP::Attribute attributes have no type constraints.
53 # However we need to make sure we leave an undef value there
54 # because the inlined code is using the index of the attributes
55 # to determine where to find the type constraint
57 my @type_constraints = map {
58 $_->can('type_constraint') ? $_->type_constraint : undef
61 my @type_constraint_bodies = map {
62 defined $_ ? $_->_compiled_type_constraint : undef;
66 confess "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@" if $@;
68 $self->{'body'} = $code;