/**
* Initialize any static state, can initialize parser for a file
*/
function __construct($css = null, $root_path = null, $opts = null)
{
if (!self::$operatorString) {
self::$operatorString = '(' . implode('|', array_map(array($this, 'preg_quote'), array_keys(self::$precedence))) . ')';
}
$this->importDir = $root_path;
$this->buffer = $css;
}
