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<?php declare(strict_types=1);
/*
* This file is part of sebastian/type.
*
* (c) Sebastian Bergmann <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Type;
use function count;
use function implode;
use function sort;
final class UnionType extends Type
{
/**
* @psalm-var list<Type>
*/
private $types;
/**
* @throws RuntimeException
*/
public function __construct(Type ...$types)
{
$this->ensureMinimumOfTwoTypes(...$types);
$this->ensureOnlyValidTypes(...$types);
$this->types = $types;
}
public function isAssignable(Type $other): bool
{
foreach ($this->types as $type) {
if ($type->isAssignable($other)) {
return true;
}
}
return false;
}
public function asString(): string
{
return $this->name();
}
/**
* @deprecated
*
* @codeCoverageIgnore
*/
public function getReturnTypeDeclaration(): string
{
return ': ' . $this->name();
}
public function name(): string
{
$types = [];
foreach ($this->types as $type) {
$types[] = $type->name();
}
sort($types);
return implode('|', $types);
}
public function allowsNull(): bool
{
foreach ($this->types as $type) {
if ($type instanceof NullType) {
return true;
}
}
return false;
}
/**
* @throws RuntimeException
*/
private function ensureMinimumOfTwoTypes(Type ...$types): void
{
if (count($types) < 2) {
throw new RuntimeException(
'A union type must be composed of at least two types'
);
}
}
/**
* @throws RuntimeException
*/
private function ensureOnlyValidTypes(Type ...$types): void
{
foreach ($types as $type) {
if ($type instanceof UnknownType) {
throw new RuntimeException(
'A union type must not be composed of an unknown type'
);
}
if ($type instanceof VoidType) {
throw new RuntimeException(
'A union type must not be composed of a void type'
);
}
}
}
}
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