src/Utils.php
public static function calculateTrailingWhitespaceIndent(Token $token)
    {
        if (!$token->isWhitespace()) {
            throw new \InvalidArgumentException(sprintf('The given token must be whitespace, got "%s".', $token->getName()));
        }

        $str = strrchr(
            str_replace(["\r\n", "\r"], "\n", $token->getContent()),
            "\n"
        );

        if (false === $str) {
            return '';
        }

        return ltrim($str, "\n");
    }
public static function calculateTrailingWhitespaceIndent(Token $token)
    {
        if (!$token->isWhitespace()) {
            throw new \InvalidArgumentException(sprintf('The given token must be whitespace, got "%s".', $token->getName()));
        }

        $str = strrchr(
            str_replace(["\r\n", "\r"], "\n", $token->getContent()),
            "\n"
        );

        if (false === $str) {
            return '';
        }

        return ltrim($str, "\n");
    }
Calculate the trailing whitespace.

What we're doing here is grabbing everything after the final newline.

@param Token $token

@return string