vendor/kriswallsmith/assetic/src/Assetic/Util/CssUtils.php

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<?php

/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2014 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Assetic\Util;

/**
 * CSS Utils.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
abstract class CssUtils
{
    const REGEX_URLS            = '/url\((["\']?)(?P<url>.*?)(\\1)\)/';
    const REGEX_IMPORTS         = '/@import (?:url\()?(\'|"|)(?P<url>[^\'"\)\n\r]*)\1\)?;?/';
    const REGEX_IMPORTS_NO_URLS = '/@import (?!url\()(\'|"|)(?P<url>[^\'"\)\n\r]*)\1;?/';
    const REGEX_IE_FILTERS      = '/src=(["\']?)(?P<url>.*?)\\1/';
    const REGEX_COMMENTS        = '/(\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)/';

    /**
     * Filters all references -- url() and "@import" -- through a callable.
     *
     * @param string   $content  The CSS
     * @param callable $callback A PHP callable
     *
     * @return string The filtered CSS
     */
    public static function filterReferences($content, $callback)
    {
        $content = static::filterUrls($content, $callback);
        $content = static::filterImports($content, $callback, false);
        $content = static::filterIEFilters($content, $callback);

        return $content;
    }

    /**
     * Filters all CSS url()'s through a callable.
     *
     * @param string   $content  The CSS
     * @param callable $callback A PHP callable
     *
     * @return string The filtered CSS
     */
    public static function filterUrls($content, $callback)
    {
        $pattern = static::REGEX_URLS;

        return static::filterCommentless($content, function ($part) use (& $callback, $pattern) {
            return preg_replace_callback($pattern, $callback, $part);
        });
    }