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

class SpacelessViewHelper extends AbstractViewHelper implements CompilableInterface
{
    public function render()
    {
        return static::renderStatic($this->arguments, $this->renderChildrenClosure, $this->renderingContext);
    }

    public static function renderStatic(array $arguments, \Closure $childClosure, RenderingContextInterface $renderingContext)
    {
        return trim(preg_replace('/\\>\\s+\\</', '><', $childClosure()));
    }
}