CSSmin.php

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<?php
namespace Magento\Framework\Code\Minifier\Adapter\Css;

use tubalmartin\CssMin\Minifier as CssMinLibrary;
use Magento\Framework\Code\Minifier\AdapterInterface;

class CSSmin implements AdapterInterface
{
    const PCRE_RECURSION_LIMIT = 1000;

    protected $cssMinifier;

    public function __construct(CssMinLibrary $cssMinifier)
    {
        // TODO: set $cssMinifier in constructor once MAGETWO-51176 is resolved.
    }

    private function getCssMin()
    {
        if (!($this->cssMinifier instanceof CssMinLibrary)) {
            $this->cssMinifier = new CssMinLibrary(false);
        }
        return $this->cssMinifier;
    }

    public function minify($content)
    {
        $pcreRecursionLimit = ini_get('pcre.recursion_limit');
        ini_set('pcre.recursion_limit', self::PCRE_RECURSION_LIMIT);
        $result = $this->getCssMin()->run($content);
        ini_set('pcre.recursion_limit', $pcreRecursionLimit);
        return $result;
    }
}