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<?php declare(strict_types=1);

namespace PhpParser\Builder;

use PhpParser\BuilderHelpers;
use PhpParser\Node;

abstract class FunctionLike extends Declaration
{
    protected $returnByRef = false;
    protected $params = [];

/** @var string|Node\Name|Node\NullableType|null */
    protected $returnType = null;

/**
     * Make the function return by reference.
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function makeReturnByRef() {
        $this->returnByRef = true;

return $this;
    }

/**
     * Adds a parameter.
     *
     * @param Node\Param|Param $param The parameter to add
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function addParam($param) {
        $param = BuilderHelpers::normalizeNode($param);

if (!$param instanceof Node\Param) {
            throw new \LogicException(sprintf('Expected parameter node, got "%s"', $param->getType()));
        }

$this->params[] = $param;

return $this;
    }

/**
     * Adds multiple parameters.
     *
     * @param array $params The parameters to add
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function addParams(array $params) {
        foreach ($params as $param) {
            $this->addParam($param);
        }

return $this;
    }

/**
     * Sets the return type for PHP 7.
     *
     * @param string|Node\Name|Node\Identifier|Node\ComplexType $type
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function setReturnType($type) {
        $this->returnType = BuilderHelpers::normalizeType($type);

return $this;
    }
}