File Coverage

blib/lib/Type/Tiny/Duck.pm

Criterion	Covered	Total	%
statement	72	81	88.8
branch	17	26	65.3
condition	4	9	44.4
subroutine	21	22	95.4
pod	5	5	100.0
total	119	143	83.2

package Type::Tiny::Duck;

use 5.008001;
use strict;
use warnings;

BEGIN {
	$Type::Tiny::Duck::AUTHORITY = 'cpan:TOBYINK';
	$Type::Tiny::Duck::VERSION   = '2.002001';
}

$Type::Tiny::Duck::VERSION =~ tr/_//d;

use Scalar::Util qw< blessed >;

sub _croak ($;@) { require Error::TypeTiny; goto \&Error::TypeTiny::croak }

use Exporter::Tiny 1.004001 ();
use Type::Tiny::ConstrainedObject ();
our @ISA = qw( Type::Tiny::ConstrainedObject Exporter::Tiny );

sub _short_name { 'Duck' }

sub _exporter_fail {
	my ( $class, $type_name, $methods, $globals ) = @_;
	my $caller = $globals->{into};
	my $type = $class->new(
		name      => $type_name,
		methods   => [ @$methods ],
	);
	$INC{'Type/Registry.pm'}
		? 'Type::Registry'->for_class( $caller )->add_type( $type, $type_name )
		: ( $Type::Registry::DELAYED{$caller}{$type_name} = $type )
		unless( ref($caller) or $caller eq '-lexical' or $globals->{'lexical'} );
	return map +( $_->{name} => $_->{code} ), @{ $type->exportables };
}

sub new {
	my $proto = shift;

	my %opts = ( @_ == 1 ) ? %{ $_[0] } : @_;
	_croak "Need to supply list of methods" unless exists $opts{methods};

	$opts{methods} = [ $opts{methods} ] unless ref $opts{methods};

	if ( Type::Tiny::_USE_XS ) {
		my $methods = join ",", sort( @{ $opts{methods} } );
		my $xsub    = Type::Tiny::XS::get_coderef_for( "HasMethods[$methods]" );
		$opts{compiled_type_constraint} = $xsub if $xsub;
	}
	elsif ( Type::Tiny::_USE_MOUSE ) {
		require Mouse::Util::TypeConstraints;
		my $maker = "Mouse::Util::TypeConstraints"->can( "generate_can_predicate_for" );
		$opts{compiled_type_constraint} = $maker->( $opts{methods} ) if $maker;
	}

	return $proto->SUPER::new( %opts );
} #/ sub new

sub _lockdown {
	my ( $self, $callback ) = @_;
	$callback->( $self->{methods} );
}

sub methods { $_[0]{methods} }
sub inlined { $_[0]{inlined} ||= $_[0]->_build_inlined }

sub has_inlined { !!1 }

sub _is_null_constraint { 0 }

sub _build_constraint {
	my $self    = shift;
	my @methods = @{ $self->methods };
	return sub {
		blessed( $_[0] )
			and not grep( !$_[0]->can( $_ ), @methods );
	};
}

sub _build_inlined {
	my $self    = shift;
	my @methods = @{ $self->methods };

	my $xsub;
	if ( Type::Tiny::_USE_XS ) {
		my $methods = join ",", sort( @{ $self->methods } );
		$xsub = Type::Tiny::XS::get_subname_for( "HasMethods[$methods]" );
	}

	sub {
		my $var = $_[1];
		local $" = q{ };

		# If $var is $_ or $_->{foo} or $foo{$_} or somesuch, then we
		# can't use it within the grep expression, so we need to save
		# it into a temporary variable ($tmp).
		my $code =
			( $var =~ /\$_/ )
			? qq{ Scalar::Util::blessed($var) and not do { my \$tmp = $var; grep(!\$tmp->can(\$_), qw/@methods/) } }
			: qq{ Scalar::Util::blessed($var) and not grep(!$var->can(\$_), qw/@methods/) };

		return qq{do { $Type::Tiny::SafePackage use Scalar::Util (); $code }}
			if $Type::Tiny::AvoidCallbacks;
		return "$xsub\($var\)"
			if $xsub;
		$code;
	};
} #/ sub _build_inlined

sub _instantiate_moose_type {
	my $self = shift;
	my %opts = @_;
	delete $opts{parent};
	delete $opts{constraint};
	delete $opts{inlined};

	require Moose::Meta::TypeConstraint::DuckType;
	return "Moose::Meta::TypeConstraint::DuckType"
		->new( %opts, methods => $self->methods );
} #/ sub _instantiate_moose_type

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 );

	require Type::Utils;
	return [
		sprintf(
			'"%s" requires that the reference can %s',
			$self,
			Type::Utils::english_list( map qq["$_"], @{ $self->methods } ),
		),
		map sprintf( 'The reference cannot "%s"', $_ ),
		grep !$value->can( $_ ),
		@{ $self->methods }
	];
} #/ sub validate_explain

push @Type::Tiny::CMP, sub {
	my $A = shift->find_constraining_type;
	my $B = shift->find_constraining_type;
	return Type::Tiny::CMP_UNKNOWN
		unless $A->isa( __PACKAGE__ ) && $B->isa( __PACKAGE__ );

	my %seen;
	for my $word ( @{ $A->methods } ) {
		$seen{$word} += 1;
	}
	for my $word ( @{ $B->methods } ) {
		$seen{$word} += 2;
	}

	my $values = join( '', CORE::values %seen );
	if ( $values =~ /^3*$/ ) {
		return Type::Tiny::CMP_EQUIVALENT;
	}
	elsif ( $values !~ /2/ ) {
		return Type::Tiny::CMP_SUBTYPE;
	}
	elsif ( $values !~ /1/ ) {
		return Type::Tiny::CMP_SUPERTYPE;
	}

	return Type::Tiny::CMP_UNKNOWN;
};

1;

__END__