Typo3DependencyViewHelper.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\Core\Utility\MathUtility;
use TYPO3\CMS\Core\Utility\VersionNumberUtility;
use TYPO3\CMS\Extensionmanager\Domain\Model\Dependency;
use TYPO3\CMS\Extensionmanager\Domain\Model\Extension;

class Typo3DependencyViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    public function render(Extension $extension) {
        foreach ($extension->getDependencies() as $dependency) {
            if ($dependency->getIdentifier() === 'typo3') {
                $lowestVersion = $dependency->getLowestVersion();
                $highestVersion = $dependency->getHighestVersion();
                $cssClass = $this->isVersionSuitable($lowestVersion, $highestVersion) ? 'success' : 'default';
                return
                    '<span class="label label-' . $cssClass . '">'
                        . htmlspecialchars($lowestVersion) . ' - ' . htmlspecialchars($highestVersion)
                    . '</span>';
            }
        }
        return '';
    }

    protected function isVersionSuitable($lowestVersion, $highestVersion) {
        $numericTypo3Version = VersionNumberUtility::convertVersionNumberToInteger(VersionNumberUtility::getNumericTypo3Version());
        $numericLowestVersion = VersionNumberUtility::convertVersionNumberToInteger($lowestVersion);
        $numericHighestVersion = VersionNumberUtility::convertVersionNumberToInteger($highestVersion);
        return MathUtility::isIntegerInRange($numericTypo3Version, $numericLowestVersion, $numericHighestVersion);
    }
}