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<?php declare(strict_types=1); /* * This file is part of sebastian/type. * * (c) Sebastian Bergmann <sebastian@phpunit.de> * * 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' ); } } } }