Symfony\Component\Yaml\Parser::cleanup PHP Method

    private function cleanup($value)
    {
        $value = str_replace(array("\r\n", "\r"), "\n", $value);
        // strip YAML header
        $count = 0;
        $value = preg_replace('#^\\%YAML[: ][\\d\\.]+.*\\n#u', '', $value, -1, $count);
        $this->offset += $count;
        // remove leading comments
        $trimmedValue = preg_replace('#^(\\#.*?\\n)+#s', '', $value, -1, $count);
        if ($count == 1) {
            // items have been removed, update the offset
            $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n");
            $value = $trimmedValue;
        }
        // remove start of the document marker (---)
        $trimmedValue = preg_replace('#^\\-\\-\\-.*?\\n#s', '', $value, -1, $count);
        if ($count == 1) {
            // items have been removed, update the offset
            $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n");
            $value = $trimmedValue;
            // remove end of the document marker (...)
            $value = preg_replace('#\\.\\.\\.\\s*$#', '', $value);
        }
        return $value;
    }