if ( $important ) {
              $prop = $match[1];
            }
            $prop = trim($prop);
            */
            if ($DEBUGCSS) print '(';

            $important = false;
            $prop = trim($prop);

            if (substr($prop, -9) === 'important') {
                $prop_tmp = rtrim(substr($prop, 0, -9));

                if (substr($prop_tmp, -1) === '!') {
                    $prop = rtrim(substr($prop_tmp, 0, -1));
                    $important = true;
                }
            }

            if ($prop === "") {
                if ($DEBUGCSS) print 'empty)';
                continue;
            }

            $i = mb_strpos($prop, ":");
            if ($i === false) {
                if ($DEBUGCSS) print 'novalue' . $prop . ')';
                continue;
            }

            $prop_name = rtrim(mb_strtolower(mb_substr($prop, 0, $i)));
            $value = ltrim(mb_substr($prop, $i + 1));

            if ($DEBUGCSS) print $prop_name . ':=' . $value . ($important ? '!IMPORTANT' : '') . ')';

            $style->set_prop($prop_name, $value, $important, false);
        }
        if ($DEBUGCSS) print '_parse_properties]';

        return $style;
    }

    /**
     * parse selector + rulesets
     *
     * @param string $str CSS selectors and rulesets
     * @param array $media_queries
     */
    private function _parse_sections($str, $media_queries = [])
    {
        // Pre-process selectors: collapse all whitespace and strip whitespace
        // around '>', '.', ':', '+', '~', '#'
        $patterns = ["/\s+/", "/\s+([>.:+~#])\s+/"];
        $replacements = [" ", "\\1"];
        $DEBUGCSS = $this->_dompdf->getOptions()->getDebugCss();

        $sections = explode("}", $str);
        if ($DEBUGCSS) print '[_parse_sections';
        foreach ($sections as $sect) {
            $i = mb_strpos($sect, "{");
            if ($i === false) { continue; }

            if ($DEBUGCSS) print '[section';

            $selector_str = preg_replace($patterns, $replacements, mb_substr($sect, 0, $i));
            $selectors = preg_split("/,(?![^\(]*\))/", $selector_str, 0, PREG_SPLIT_NO_EMPTY);
            $style = $this->_parse_properties(trim(mb_substr($sect, $i + 1)));

            // Assign it to the selected elements
            foreach ($selectors as $selector) {
                $selector = trim($selector);

                if ($selector === "") {
                    if ($DEBUGCSS) print '#empty#';
                    continue;
                }
                if ($DEBUGCSS) print '#' . $selector . '#';
                //if ($DEBUGCSS) { if (strpos($selector,'p') !== false) print '!!!p!!!#'; }

                //FIXME: tag the selector with a hash of the media query to separate it from non-conditional styles (?), xpath comments are probably not what we want to do here
                if (count($media_queries) > 0) {
                    $style->set_media_queries($media_queries);
                }
                $this->add_style($selector, $style);
            }

            if ($DEBUGCSS) {
                print 'section]';
            }
        }

        if ($DEBUGCSS) {
            print "_parse_sections]\n";
        }
    }

    /**
     * @return string
     */
    public function getDefaultStylesheet()
    {
        $options = $this->_dompdf->getOptions();
        $rootDir = realpath($options->getRootDir());
        return Helpers::build_url("file://", "", $rootDir, $rootDir . self::DEFAULT_STYLESHEET);
    }

    /**
     * @param FontMetrics $fontMetrics
     * @return $this
     */
    public function setFontMetrics(FontMetrics $fontMetrics)
    {
        $this->fontMetrics = $fontMetrics;
        return $this;
    }

    /**
     * @return FontMetrics
     */
    public function getFontMetrics()
    {
        return $this->fontMetrics;
    }

    /**
     * dumps the entire stylesheet as a string
     *
     * Generates a string of each selector and associated style in the
     * Stylesheet.  Useful for debugging.
     *
     * @return string
     */
    function __toString()
    {
        $str = "";
        foreach ($this->_styles as $selector => $selector_styles) {
            foreach ($selector_styles as $style) {
                $str .= "$selector => " . $style->__toString() . "\n";
            }
        }

        return $str;
    }
}