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|
package Type::Tiny::Role;
use 5.006001;
use strict;
use warnings;
BEGIN {
$Type::Tiny::Role::AUTHORITY = 'cpan:TOBYINK';
$Type::Tiny::Role::VERSION = '1.000004';
}
use Scalar::Util qw< blessed weaken >;
sub _croak ($;@) { require Error::TypeTiny; goto \&Error::TypeTiny::croak }
require Type::Tiny;
our @ISA = 'Type::Tiny';
my %cache;
sub new {
my $proto = shift;
my %opts = (@_==1) ? %{$_[0]} : @_;
_croak "Role type constraints cannot have a parent constraint passed to the constructor" if exists $opts{parent};
_croak "Role type constraints cannot have a constraint coderef passed to the constructor" if exists $opts{constraint};
_croak "Role type constraints cannot have a inlining coderef passed to the constructor" if exists $opts{inlined};
_croak "Need to supply role name" unless exists $opts{role};
return $proto->SUPER::new(%opts);
}
sub role { $_[0]{role} }
sub inlined { $_[0]{inlined} ||= $_[0]->_build_inlined }
sub has_inlined { !!1 }
sub _build_constraint
{
my $self = shift;
my $role = $self->role;
return sub { blessed($_) and do { my $method = $_->can('DOES')||$_->can('isa'); $_->$method($role) } };
}
sub _build_inlined
{
my $self = shift;
my $role = $self->role;
sub {
my $var = $_[1];
qq{Scalar::Util::blessed($var) and do { my \$method = $var->can('DOES')||$var->can('isa'); $var->\$method(q[$role]) }};
};
}
sub _build_default_message
{
my $self = shift;
my $c = $self->role;
return sub { sprintf '%s did not pass type constraint (not DOES %s)', Type::Tiny::_dd($_[0]), $c } if $self->is_anon;
my $name = "$self";
return sub { sprintf '%s did not pass type constraint "%s" (not DOES %s)', Type::Tiny::_dd($_[0]), $name, $c };
}
sub has_parent
{
!!1;
}
sub parent
{
require Types::Standard;
Types::Standard::Object();
}
sub validate_explain
{
my $self = shift;
my ($value, $varname) = @_;
$varname = '$_' unless defined $varname;
return undef if $self->check($value);
return ["Not a blessed reference"] unless blessed($value);
return ["Reference provides no DOES method to check roles"] unless $value->can('DOES');
my $display_var = $varname eq q{$_} ? '' : sprintf(' (in %s)', $varname);
return [
sprintf('"%s" requires that the reference does %s', $self, $self->role),
sprintf("The reference%s doesn't %s", $display_var, $self->role),
];
}
1;
__END__
=pod
=encoding utf-8
=head1 NAME
Type::Tiny::Role - type constraints based on the "DOES" method
=head1 STATUS
This module is covered by the
L<Type-Tiny stability policy|Type::Tiny::Manual::Policies/"STABILITY">.
=head1 DESCRIPTION
Type constraints of the general form C<< { $_->DOES("Some::Role") } >>.
This package inherits from L<Type::Tiny>; see that for most documentation.
Major differences are listed below:
=head2 Attributes
=over
=item C<role>
The role for the constraint.
Note that this package doesn't subscribe to any particular flavour of roles
(L<Moose::Role>, L<Mouse::Role>, L<Moo::Role>, L<Role::Tiny>, etc). It simply
trusts the object's C<DOES> method (see L<UNIVERSAL>).
=item C<constraint>
Unlike Type::Tiny, you I<cannot> pass a constraint coderef to the constructor.
Instead rely on the default.
=item C<inlined>
Unlike Type::Tiny, you I<cannot> pass an inlining coderef to the constructor.
Instead rely on the default.
=item C<parent>
Parent is always Types::Standard::Object, and cannot be passed to the
constructor.
=back
=head1 BUGS
Please report any bugs to
L<http://rt.cpan.org/Dist/Display.html?Queue=Type-Tiny>.
=head1 SEE ALSO
L<Type::Tiny::Manual>.
L<Type::Tiny>.
L<Moose::Meta::TypeConstraint::Role>.
=head1 AUTHOR
Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
=head1 COPYRIGHT AND LICENCE
This software is copyright (c) 2013-2014 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=head1 DISCLAIMER OF WARRANTIES
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
