Composite.php

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<?php
namespace Magento\Framework\Phrase\Renderer;

use Magento\Framework\Phrase\RendererInterface;

class Composite implements RendererInterface
{
    protected $_renderers;

    public function __construct(array $renderers)
    {
        foreach ($renderers as $renderer) {
            if (!$renderer instanceof RendererInterface) {
                throw new \InvalidArgumentException(
                    sprintf('Instance of the phrase renderer is expected, got %s instead.', get_class($renderer))
                );
            }
        }
        $this->_renderers = $renderers;
    }

    public function render(array $source, array $arguments = [])
    {
        $result = $source;
        foreach ($this->_renderers as $render) {
            $result[] = $render->render($result, $arguments);
        }
        return end($result);
    }
}