InstallationStateCssClassViewHelper.php

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

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

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

class InstallationStateCssClassViewHelper extends AbstractViewHelper implements CompilableInterface
{
    public function render($needle, array $haystack)
    {
        return static::renderStatic(
            array(
                'needle' => $needle,
                'haystack' => $haystack,
            ),
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $needle = $arguments['needle'];
        $haystack = $arguments['haystack'];
        if (array_key_exists($needle, $haystack)) {
            if (isset($haystack[$needle]['installed']) && $haystack[$needle]['installed'] === true) {
                return 'installed';
            } else {
                return 'available';
            }
        }
        return '';
    }
}