File Coverage

blib/lib/Type/Tiny/Intersection.pm

Criterion	Covered	Total	%
statement	99	101	99.0
branch	36	44	81.8
condition	8	10	80.0
subroutine	26	26	100.0
pod	12	12	100.0
total	181	193	94.3

package Type::Tiny::Intersection;

use 5.008001;
use strict;
use warnings;

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

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

use Scalar::Util qw< blessed >;
use Types::TypeTiny ();

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

use Type::Tiny ();
our @ISA = 'Type::Tiny';

__PACKAGE__->_install_overloads(
	q[@{}] => sub { $_[0]{type_constraints} ||= [] },
);

sub new_by_overload {
	my $proto = shift;
	my %opts  = ( @_ == 1 ) ? %{ $_[0] } : @_;

	my @types = @{ $opts{type_constraints} };
	if ( my @makers = map scalar( blessed($_) && $_->can( 'new_intersection' ) ), @types ) {
		my $first_maker = shift @makers;
		if ( ref $first_maker ) {
			my $all_same = not grep $_ ne $first_maker, @makers;
			if ( $all_same ) {
				return ref( $types[0] )->$first_maker( %opts );
			}
		}
	}

	return $proto->new( \%opts );
}

sub new {
	my $proto = shift;

	my %opts = ( @_ == 1 ) ? %{ $_[0] } : @_;
	_croak "Intersection type constraints cannot have a parent constraint"
		if exists $opts{parent};
	_croak
		"Intersection type constraints cannot have a constraint coderef passed to the constructor"
		if exists $opts{constraint};
	_croak
		"Intersection type constraints cannot have a inlining coderef passed to the constructor"
		if exists $opts{inlined};
	_croak "Need to supply list of type constraints"
		unless exists $opts{type_constraints};

	$opts{type_constraints} = [
		map { $_->isa( __PACKAGE__ ) ? @$_ : $_ }
			map Types::TypeTiny::to_TypeTiny( $_ ),
		@{
			ref $opts{type_constraints} eq "ARRAY"
			? $opts{type_constraints}
			: [ $opts{type_constraints} ]
		}
	];

	if ( Type::Tiny::_USE_XS ) {
		my @constraints = @{ $opts{type_constraints} };
		my @known       = map {
			my $known = Type::Tiny::XS::is_known( $_->compiled_check );
			defined( $known ) ? $known : ();
		} @constraints;

		if ( @known == @constraints ) {
			my $xsub = Type::Tiny::XS::get_coderef_for(
				sprintf "AllOf[%s]",
				join( ',', @known )
			);
			$opts{compiled_type_constraint} = $xsub if $xsub;
		}
	} #/ if ( Type::Tiny::_USE_XS)

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

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

sub type_constraints { $_[0]{type_constraints} }
sub constraint       { $_[0]{constraint} ||= $_[0]->_build_constraint }

sub _is_null_constraint { 0 }

sub _build_display_name {
	my $self = shift;
	join q[&], @$self;
}

sub _build_constraint {
	my @checks = map $_->compiled_check, @{ +shift };
	return sub {
		my $val = $_;
		$_->( $val ) || return for @checks;
		return !!1;
	}
}

sub can_be_inlined {
	my $self = shift;
	not grep !$_->can_be_inlined, @$self;
}

sub inline_check {
	my $self = shift;

	if ( Type::Tiny::_USE_XS and !exists $self->{xs_sub} ) {
		$self->{xs_sub} = undef;

		my @constraints = @{ $self->type_constraints };
		my @known       = map {
			my $known = Type::Tiny::XS::is_known( $_->compiled_check );
			defined( $known ) ? $known : ();
		} @constraints;

		if ( @known == @constraints ) {
			$self->{xs_sub} = Type::Tiny::XS::get_subname_for(
				sprintf "AllOf[%s]",
				join( ',', @known )
			);
		}
	} #/ if ( Type::Tiny::_USE_XS...)

	my $code = sprintf '(%s)', join " and ", map $_->inline_check( $_[0] ), @$self;

	return "do { $Type::Tiny::SafePackage $code }"
		if $Type::Tiny::AvoidCallbacks;
	return "$self->{xs_sub}\($_[0]\)"
		if $self->{xs_sub};
	return $code;
} #/ sub inline_check

sub has_parent {
	!!@{ $_[0]{type_constraints} };
}

sub parent {
	$_[0]{type_constraints}[0];
}

sub validate_explain {
	my $self = shift;
	my ( $value, $varname ) = @_;
	$varname = '$_' unless defined $varname;

	return undef if $self->check( $value );

	require Type::Utils;
	for my $type ( @$self ) {
		my $deep = $type->validate_explain( $value, $varname );
		return [
			sprintf(
				'"%s" requires that the value pass %s',
				$self,
				Type::Utils::english_list( map qq["$_"], @$self ),
			),
			@$deep,
		] if $deep;
	} #/ for my $type ( @$self )

	# This should never happen...
	return;    # uncoverable statement
} #/ sub validate_explain

my $_delegate = sub {
	my ( $self, $method ) = ( shift, shift );
	my @types = @{ $self->type_constraints };
	my $found = 0;
	for my $i ( 0 .. $#types ) {
		my $type = $types[$i];
		if ( $type->can( $method ) ) {
			$types[$i] = $type->$method( @_ );
			++$found;
			last;
		}
	}
	_croak(
		'Could not apply method %s to any type within the intersection',
		$method
	) unless $found;
	ref( $self )->new( type_constraints => \@types );
};

sub stringifies_to {
	my $self = shift;
	$self->$_delegate( stringifies_to => @_ );
}

sub numifies_to {
	my $self = shift;
	$self->$_delegate( numifies_to => @_ );
}

sub with_attribute_values {
	my $self = shift;
	$self->$_delegate( with_attribute_values => @_ );
}

my $comparator;
$comparator = sub {
	my $A = shift->find_constraining_type;
	my $B = shift->find_constraining_type;

	if ( $A->isa( __PACKAGE__ ) ) {
		my @A_constraints = map $_->find_constraining_type, @{ $A->type_constraints };

		my @A_equal_to_B = grep $_->equals( $B ), @A_constraints;
		if ( @A_equal_to_B == @A_constraints ) {
			return Type::Tiny::CMP_EQUIVALENT();
		}

		my @A_subs_of_B = grep $_->is_a_type_of( $B ), @A_constraints;
		if ( @A_subs_of_B ) {
			return Type::Tiny::CMP_SUBTYPE();
		}
	} #/ if ( $A->isa( __PACKAGE__...))

	elsif ( $B->isa( __PACKAGE__ ) ) {
		my $r = $comparator->( $B, $A );
		return $r  if $r eq Type::Tiny::CMP_EQUIVALENT();
		return -$r if $r eq Type::Tiny::CMP_SUBTYPE();
	}

	return Type::Tiny::CMP_UNKNOWN();
};
push @Type::Tiny::CMP, $comparator;

1;

__END__