X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMoose%2FMeta%2FTypeConstraint%2FUnion.pm;h=f53afe1e7cd89ff1203b826640aee1ef3c0e0bf4;hb=d33906c9480413d89c4c7bcdc57236e9cb88f20b;hp=916711153b07926791d7be80fc4fe6f71559d4cb;hpb=8ee73eeb7e76858f1dbe56f69101a2dc1e096559;p=gitmo%2FMoose.git diff --git a/lib/Moose/Meta/TypeConstraint/Union.pm b/lib/Moose/Meta/TypeConstraint/Union.pm index 9167111..f53afe1 100644 --- a/lib/Moose/Meta/TypeConstraint/Union.pm +++ b/lib/Moose/Meta/TypeConstraint/Union.pm @@ -5,7 +5,13 @@ use strict; use warnings; use metaclass; -our $VERSION = '0.03'; +use Moose::Meta::TypeCoercion::Union; + +our $VERSION = '0.73_02'; +$VERSION = eval $VERSION; +our $AUTHORITY = 'cpan:STEVAN'; + +use base 'Moose::Meta::TypeConstraint'; __PACKAGE__->meta->add_attribute('type_constraints' => ( accessor => 'type_constraints', @@ -13,76 +19,70 @@ __PACKAGE__->meta->add_attribute('type_constraints' => ( )); sub new { - my $class = shift; - my $self = $class->meta->new_object(@_); + my ($class, %options) = @_; + + my $name = join '|' => sort { $a cmp $b } + map { $_->name } @{ $options{type_constraints} }; + + my $self = $class->SUPER::new( + name => $name, + %options, + ); + + $self->_set_constraint(sub { $self->check($_[0]) }); + $self->coercion(Moose::Meta::TypeCoercion::Union->new( + type_constraint => $self + )); return $self; } -sub name { join ' | ' => map { $_->name } @{$_[0]->type_constraints} } - -# NOTE: -# this should probably never be used -# but we include it here for completeness -sub constraint { +sub _actually_compile_type_constraint { my $self = shift; - sub { $self->check($_[0]) }; + + my @constraints = @{ $self->type_constraints }; + + return sub { + my $value = shift; + foreach my $type (@constraints) { + return 1 if $type->check($value); + } + return undef; + }; } -# conform to the TypeConstraint API -sub parent { undef } -sub message { undef } -sub has_message { 0 } -# FIXME: -# not sure what this should actually do here -sub coercion { undef } +sub equals { + my ( $self, $type_or_name ) = @_; -# this should probably be memoized -sub has_coercion { - my $self = shift; - foreach my $type (@{$self->type_constraints}) { - return 1 if $type->has_coercion - } - return 0; -} + my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name); -# NOTE: -# this feels too simple, and may not always DWIM -# correctly, especially in the presence of -# close subtype relationships, however it should -# work for a fair percentage of the use cases -sub coerce { - my $self = shift; - my $value = shift; - foreach my $type (@{$self->type_constraints}) { - if ($type->has_coercion) { - my $temp = $type->coerce($value); - return $temp if $self->check($temp); - } - } - return undef; -} + return unless $other->isa(__PACKAGE__); -sub _compiled_type_constraint { - my $self = shift; - return sub { - my $value = shift; - foreach my $type (@{$self->type_constraints}) { - return 1 if $type->check($value); + my @self_constraints = @{ $self->type_constraints }; + my @other_constraints = @{ $other->type_constraints }; + + return unless @self_constraints == @other_constraints; + + # FIXME presort type constraints for efficiency? + constraint: foreach my $constraint ( @self_constraints ) { + for ( my $i = 0; $i < @other_constraints; $i++ ) { + if ( $constraint->equals($other_constraints[$i]) ) { + splice @other_constraints, $i, 1; + next constraint; + } } - return undef; } + + return @other_constraints == 0; } -sub check { - my $self = shift; - my $value = shift; - $self->_compiled_type_constraint->($value); +sub parents { + my $self = shift; + $self->type_constraints; } sub validate { - my $self = shift; - my $value = shift; + my ($self, $value) = @_; my $message; foreach my $type (@{$self->type_constraints}) { my $err = $type->validate($value); @@ -109,10 +109,128 @@ sub is_subtype_of { return 0; } +sub create_child_type { + my ( $self, %opts ) = @_; + + my $constraint + = Moose::Meta::TypeConstraint->new( %opts, parent => $self ); + + # if we have a type constraint union, and no + # type check, this means we are just aliasing + # the union constraint, which means we need to + # handle this differently. + # - SL + if ( not( defined $opts{constraint} ) + && $self->has_coercion ) { + $constraint->coercion( + Moose::Meta::TypeCoercion::Union->new( + type_constraint => $self, + ) + ); + } + + return $constraint; +} + 1; __END__ =pod +=head1 NAME + +Moose::Meta::TypeConstraint::Union - A union of Moose type constraints + +=head1 DESCRIPTION + +This metaclass represents a union of type constraints. A union takes +multiple type constraints, and is true if any one of its member +constraints is true. + +=head1 INHERITANCE + +C is a subclass of +L. + +=over 4 + +=item B<< Moose::Meta::TypeConstraint::Union->new(%options) >> + +This creates a new class type constraint based on the given +C<%options>. + +It takes the same options as its parent. It also requires an +additional option, C. This is an array reference +containing the L objects that are the +members of the union type. The C option defaults to the names +all of these member types sorted and then joined by a pipe (|). + +The constructor sets the implementation of the constraint so that is +simply calls C on the newly created object. + +Finally, the constructor also makes sure that the object's C +attribute is a L object. + +=item B<< $constraint->type_constraints >> + +This returns the array reference of C provided to +the constructor. + +=item B<< $constraint->parents >> + +This returns the same constraint as the C method. + +=item B<< $constraint->check($value) >> + +=item B<< $constraint->validate($value) >> + +These two methods simply call the relevant method on each of the +member type constraints in the union. If any type accepts the value, +the value is valid. + +With C the error message returned includes all of the error +messages returned by the member type constraints. + +=item B<< $constraint->equals($type_name_or_object) >> + +A type is considered equal if it is also a union type, and the two +unions have the same member types. + +=item B<< $constraint->is_a_type_of($type_name_or_object) >> + +This returns true if any of the member type constraints return true +for the C method. + +=item B<< $constraint->is_subtype_of >> + +This returns true if any of the member type constraints return true +for the C method. + +=item B<< $constraint->create_child_type(%options) >> + +This returns a new L object with the type +as its parent. + +=back + +=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 AUTHOR + +Stevan Little Estevan@iinteractive.comE + +=head1 COPYRIGHT AND LICENSE + +Copyright 2006-2009 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