X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=catagits%2FGitalist.git;a=blobdiff_plain;f=local-lib5%2Flib%2Fperl5%2FMoose%2FMeta%2FAttribute%2FNative%2FTrait.pm;fp=local-lib5%2Flib%2Fperl5%2FMoose%2FMeta%2FAttribute%2FNative%2FTrait.pm;h=311ee28c2a48b3f2af048133c551cbb147eb22cb;hp=0000000000000000000000000000000000000000;hb=3fea05b9fbf95091f4522528b9980a33e0235603;hpb=af746827daa7a8feccee889e1d12ebc74cc9201e diff --git a/local-lib5/lib/perl5/Moose/Meta/Attribute/Native/Trait.pm b/local-lib5/lib/perl5/Moose/Meta/Attribute/Native/Trait.pm new file mode 100644 index 0000000..311ee28 --- /dev/null +++ b/local-lib5/lib/perl5/Moose/Meta/Attribute/Native/Trait.pm @@ -0,0 +1,170 @@ + +package Moose::Meta::Attribute::Native::Trait; +use Moose::Role; +use Moose::Util::TypeConstraints; + +our $VERSION = '0.93'; +$VERSION = eval $VERSION; +our $AUTHORITY = 'cpan:STEVAN'; + +requires '_helper_type'; + +# these next two are the possible methods you can use in the 'handles' +# map. + +# provide a Class or Role which we can collect the method providers +# from + +# or you can provide a HASH ref of anon subs yourself. This will also +# collect and store the methods from a method_provider as well +has 'method_constructors' => ( + is => 'ro', + isa => 'HashRef', + lazy => 1, + default => sub { + my $self = shift; + return +{} unless $self->has_method_provider; + # or grab them from the role/class + my $method_provider = $self->method_provider->meta; + return +{ + map { + $_ => $method_provider->get_method($_) + } $method_provider->get_method_list + }; + }, +); + +has '+default' => ( required => 1 ); +has '+type_constraint' => ( required => 1 ); + +# methods called prior to instantiation + +before '_process_options' => sub { + my ( $self, $name, $options ) = @_; + + $self->_check_helper_type( $options, $name ); + + $options->{is} = $self->_default_is + if ! exists $options->{is} && $self->can('_default_is'); + + $options->{default} = $self->_default_default + if ! exists $options->{default} && $self->can('_default_default'); +}; + +sub _check_helper_type { + my ( $self, $options, $name ) = @_; + + my $type = $self->_helper_type; + + $options->{isa} = $type + unless exists $options->{isa}; + + my $isa = Moose::Util::TypeConstraints::find_or_create_type_constraint( + $options->{isa} ); + + ( $isa->is_a_type_of($type) ) + || confess + "The type constraint for $name must be a subtype of $type but it's a $isa"; +} + +around '_canonicalize_handles' => sub { + my $next = shift; + my $self = shift; + my $handles = $self->handles; + + return unless $handles; + + unless ( 'HASH' eq ref $handles ) { + $self->throw_error( + "The 'handles' option must be a HASH reference, not $handles" ); + } + + return map { + my $to = $handles->{$_}; + $to = [$to] unless ref $to; + $_ => $to + } keys %$handles; +}; + +# methods called after instantiation + +before 'install_accessors' => sub { (shift)->_check_handles_values }; + +sub _check_handles_values { + my $self = shift; + + my $method_constructors = $self->method_constructors; + + my %handles = $self->_canonicalize_handles; + + for my $original_method ( values %handles ) { + my $name = $original_method->[0]; + ( exists $method_constructors->{$name} ) + || confess "$name is an unsupported method type"; + } + +} + +around '_make_delegation_method' => sub { + my $next = shift; + my ( $self, $handle_name, $method_to_call ) = @_; + + my ( $name, @curried_args ) = @$method_to_call; + + my $method_constructors = $self->method_constructors; + + my $code = $method_constructors->{$name}->( + $self, + $self->get_read_method_ref, + $self->get_write_method_ref, + ); + + return $next->( + $self, + $handle_name, + sub { + my $instance = shift; + return $code->( $instance, @curried_args, @_ ); + }, + ); +}; + +no Moose::Role; +no Moose::Util::TypeConstraints; + +1; + +__END__ + +=head1 NAME + +Moose::Meta::Attribute::Native::Trait - Base role for helpers + +=head1 BUGS + +All complex software has bugs lurking in it, and this module is no +exception. If you find a bug please either email me, or add the bug +to cpan-RT. + +=head1 SEE ALSO + +Documentation for Moose native traits starts at L + +=head1 AUTHORS + +Yuval Kogman + +Shawn M Moore + +Jesse Luehrs + +=head1 COPYRIGHT AND LICENSE + +Copyright 2007-2009 by Infinity Interactive, Inc. + +L + +This library is free software; you can redistribute it and/or modify +it under the same terms as Perl itself. + +=cut