use Moose::Meta::Attribute;
use Moose::Util::TypeConstraints ();
-our $VERSION = '0.67';
-$VERSION = eval $VERSION;
-our $AUTHORITY = 'cpan:STEVAN';
-
__PACKAGE__->meta->add_attribute('type_coercion_map' => (
reader => 'type_coercion_map',
- default => sub { [] }
+ default => sub { [] },
+ Class::MOP::_definition_context(),
));
__PACKAGE__->meta->add_attribute(
Moose::Meta::Attribute->new('type_constraint' => (
reader => 'type_constraint',
- weak_ref => 1
+ weak_ref => 1,
+ Class::MOP::_definition_context(),
))
);
# private accessor
__PACKAGE__->meta->add_attribute('compiled_type_coercion' => (
- accessor => '_compiled_type_coercion'
+ accessor => '_compiled_type_coercion',
+ Class::MOP::_definition_context(),
));
-sub new {
+sub new {
my $class = shift;
- my $self = $class->meta->new_object(@_);
+ my $self = Class::MOP::class_of($class)->new_object(@_);
$self->compile_type_coercion;
return $self;
}
while (@coercion_map) {
my ($constraint_name, $action) = splice(@coercion_map, 0, 2);
my $type_constraint = ref $constraint_name ? $constraint_name : Moose::Util::TypeConstraints::find_or_parse_type_constraint($constraint_name);
- (defined $type_constraint)
- || Moose->throw_error("Could not find the type constraint ($constraint_name) to coerce from");
- push @coercions => [
- $type_constraint->_compiled_type_constraint,
- $action
+
+ unless ( defined $type_constraint ) {
+ require Moose;
+ Moose->throw_error("Could not find the type constraint ($constraint_name) to coerce from");
+ }
+
+ push @coercions => [
+ $type_constraint->_compiled_type_constraint,
+ $action
];
}
- $self->_compiled_type_coercion(sub {
+ $self->_compiled_type_coercion(sub {
my $thing = shift;
foreach my $coercion (@coercions) {
my ($constraint, $converter) = @$coercion;
if ($constraint->($thing)) {
- local $_ = $thing;
+ local $_ = $thing;
return $converter->($thing);
}
}
return $thing;
- });
+ });
}
sub has_coercion_for_type {
sub add_type_coercions {
my ($self, @new_coercion_map) = @_;
-
- my $coercion_map = $self->type_coercion_map;
+
+ my $coercion_map = $self->type_coercion_map;
my %has_coercion = @$coercion_map;
-
+
while (@new_coercion_map) {
- my ($constraint_name, $action) = splice(@new_coercion_map, 0, 2);
-
- Moose->throw_error("A coercion action already exists for '$constraint_name'")
- if exists $has_coercion{$constraint_name};
-
+ my ($constraint_name, $action) = splice(@new_coercion_map, 0, 2);
+
+ if ( exists $has_coercion{$constraint_name} ) {
+ require Moose;
+ Moose->throw_error("A coercion action already exists for '$constraint_name'")
+ }
+
push @{$coercion_map} => ($constraint_name, $action);
}
-
+
# and re-compile ...
$self->compile_type_coercion;
}
1;
+# ABSTRACT: The Moose Type Coercion metaclass
+
__END__
=pod
-=head1 NAME
-
-Moose::Meta::TypeCoercion - The Moose Type Coercion metaclass
-
=head1 DESCRIPTION
-For the most part, the only time you will ever encounter an
-instance of this class is if you are doing some serious deep
-introspection. This API should not be considered final, but
-it is B<highly unlikely> that this will matter to a regular
-Moose user.
+A type coercion object is basically a mapping of one or more type
+constraints and the associated coercions subroutines.
-If you wish to use features at this depth, please come to the
-#moose IRC channel on irc.perl.org and we can talk :)
+It's unlikely that you will need to instantiate an object of this
+class directly, as it's part of the deep internals of Moose.
=head1 METHODS
=over 4
-=item B<meta>
+=item B<< Moose::Meta::TypeCoercion->new(%options) >>
-=item B<new>
+Creates a new type coercion object, based on the options provided.
-=item B<compile_type_coercion>
+=over 8
-=item B<coerce>
+=item * type_constraint
-=item B<type_coercion_map>
+This is the L<Moose::Meta::TypeConstraint> object for the type that is
+being coerced I<to>.
-=item B<type_constraint>
+=back
-=item B<has_coercion_for_type>
+=item B<< $coercion->type_coercion_map >>
-=item B<add_type_coercions>
+This returns the map of type constraints to coercions as an array
+reference. The values of the array alternate between type names and
+subroutine references which implement the coercion.
-=back
+The value is an array reference because coercions are tried in the
+order they are added.
-=head1 BUGS
+=item B<< $coercion->type_constraint >>
+
+This returns the L<Moose::Meta::TypeConstraint> that was passed to the
+constructor.
+
+=item B<< $coercion->has_coercion_for_type($type_name) >>
+
+Returns true if the coercion can coerce the named type.
-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.
+=item B<< $coercion->add_type_coercions( $type_name => $sub, ... ) >>
-=head1 AUTHOR
+This method takes a list of type names and subroutine references. If
+the coercion already has a mapping for a given type, it throws an
+exception.
-Stevan Little E<lt>stevan@iinteractive.comE<gt>
+Coercions are actually
-=head1 COPYRIGHT AND LICENSE
+=item B<< $coercion->coerce($value) >>
-Copyright 2006-2009 by Infinity Interactive, Inc.
+This method takes a value and applies the first valid coercion it
+finds.
-L<http://www.iinteractive.com>
+This means that if the value could belong to more than type in the
+coercion object, the first coercion added is used.
+
+=item B<< Moose::Meta::TypeCoercion->meta >>
+
+This will return a L<Class::MOP::Class> instance for this class.
+
+=back
+
+=head1 BUGS
-This library is free software; you can redistribute it and/or modify
-it under the same terms as Perl itself.
+See L<Moose/BUGS> for details on reporting bugs.
=cut
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