our $VERSION = '0.01';
+use Scalar::Util qw/blessed/;
+
use Sub::Name ();
use Any::Moose;
+use Any::Moose 'Util' => [ 'find_meta' ];
extends any_moose('Meta::TypeConstraint');
+=head1 ATTRIBUTES
+
+=head2 C<mapper>
+
+A code reference that maps an object class name to the name of the package in which the coercion can be found, or C<undef> to disable coercion for this class name.
+It is called with the type constraint object as first argument, followed by the class name.
+
+=cut
+
has 'mapper' => (
- is => 'ro',
- isa => 'CodeRef',
+ is => 'ro',
+ isa => 'CodeRef',
+ required => 1,
);
-has 'parent_name' => (
+=head2 C<parent>
+
+=cut
+
+has 'parent' => (
is => 'ro',
- isa => 'ClassName',
+ isa => any_moose('Meta::TypeConstraint'),
required => 1,
);
+=head2 C<user_constraint>
+
+=cut
+
has 'user_constraint' => (
is => 'ro',
isa => 'Maybe[CodeRef]',
required => 1,
);
+=head1 METHODS
+
+=cut
+
around 'new' => sub {
my ($orig, $class, %args) = @_;
unless (exists $args{mapper}) {
- $args{mapper} = sub { join '::', $_[0]->parent_name, $_[1] };
+ $args{mapper} = sub { join '::', $_[0]->parent->name, $_[1] };
}
my $parent = delete $args{parent};
- $args{parent_name} = defined $parent
- ? (blessed($parent) ? $parent->name : $parent)
- : '__ANON__';
+ unless (blessed $parent) {
+ $parent = find_meta($parent)->type_constraint;
+ }
+ __PACKAGE__->meta->find_attribute_by_name('parent')
+ ->type_constraint->assert_valid($parent);
+ $args{parent} = $parent;
- $args{user_constraint} = $args{constraint};
+ $args{user_constraint} = delete $args{constraint};
if (any_moose() eq 'Moose') {
$args{coercion} = Moose::Meta::TypeCoercion->new;
}
- my $parent_name = $args{parent_name};
- $parent_name =~ s/::+/_/g;
-
my $tc;
- $args{constraint} = Sub::Name::subname('_load' => sub {
- $tc->load(@_);
+ $args{constraint} = Sub::Name::subname('_constraint' => sub {
+ my ($thing) = @_;
+
+ # Remember that when ->check is called inside coerce, a return value of 0
+ # means that coercion should take place, while 1 signifies that the value is
+ # already OK.
+
+ # First, try a possible user defined constraint
+ my $user = $tc->user_constraint;
+ if (defined $user) {
+ my $ok = $user->($thing);
+ return 1 if $ok;
+ }
+
+ # Then, it's valid if and only if it passes the parent type constraint
+ return $tc->parent->check($thing);
});
$tc = $class->$orig(%args);
};
-sub load {
- my ($tc, $thing) = @_;
-
- # First, try a possible user defined constraint
- my $user = $tc->user_constraint;
- if (defined $user) {
- my $ok = $user->($thing);
- return 1 if $ok;
- }
-
- # When ->check is called inside coerce, a return value of 0 means that
- # coercion should take place, while 1 signifies that the value is already
- # OK.
-
- my $class = blessed($thing);
- return 0 unless $class;
- return 1 if $class->isa($tc->parent_name);
-
- my $mapper = $tc->mapper;
- my $pm = $class = $tc->$mapper($class);
-
- $pm =~ s{::}{/}g;
- $pm .= '.pm';
- return 0 if $INC{$pm}; # already loaded
-
- local $@;
- eval { require $pm; 1 };
-
- return 0;
-}
-
around 'coerce' => sub {
my ($orig, $tc, $thing) = @_;
# The original coerce gets an hold onto the type coercions *before* calling
# the constraint. Thus, we have to force the loading before recalling into
- # $orig. This is achieved by calling ->load.
- return $thing if $tc->load($thing);
+ # $orig.
+
+ # First, check whether $thing is already of the right kind.
+ return $thing if $tc->check($thing);
+
+ # If $thing isn't even an object, don't bother trying to autoload a coercion
+ my $class = blessed($thing);
+ if (defined $class) {
+ $class = $tc->mapper->($tc, $class);
+
+ if (defined $class) {
+ # Find the file to autoload
+ (my $pm = $class) =~ s{::}{/}g;
+ $pm .= '.pm';
+
+ unless ($INC{$pm}) { # Not loaded yet
+ local $@;
+ eval {
+ # We die often here, even though we're not really interested in the error.
+ # However, if a die handler is set (e.g. to \&Carp::confess), this can get
+ # very slow. Resetting the handler shows a 10% total time improvement for
+ # the geodyn app.
+ local $SIG{__DIE__};
+ require $pm;
+ };
+ }
+ }
+ }
$tc->$orig($thing);
};