RenderViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers;

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface;
use TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface;

class RenderViewHelper extends AbstractViewHelper implements CompilableInterface
{
    public function render($section = null, $partial = null, $arguments = array(), $optional = false)
    {
        return static::renderStatic(
            array(
                'section' => $section,
                'partial' => $partial,
                'arguments' => $arguments,
                'optional' => $optional,
            ),
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $section = $arguments['section'];
        $partial = $arguments['partial'];
        $optional = $arguments['optional'];
        $arguments = static::loadSettingsIntoArguments($arguments['arguments'], $renderingContext);

        $viewHelperVariableContainer = $renderingContext->getViewHelperVariableContainer();
        if ($partial !== null) {
            return $viewHelperVariableContainer->getView()->renderPartial($partial, $section, $arguments);
        } elseif ($section !== null) {
            return $viewHelperVariableContainer->getView()->renderSection($section, $arguments, $optional);
        }

        return '';
    }

    protected static function loadSettingsIntoArguments($arguments, RenderingContextInterface $renderingContext)
    {
        $templateVariableContainer = $renderingContext->getTemplateVariableContainer();
        if (!isset($arguments['settings']) && $templateVariableContainer->exists('settings')) {
            $arguments['settings'] = $templateVariableContainer->get('settings');
        }
        return $arguments;
    }
}