Get last selector

get-last-selector.scss

@function str-split($string, $separator: " ") {
    $i: str-index($string, $separator);
    @if $i != null {
        @return append(
                str-slice($string, 1, $i - 1),
                str-split(str-slice($string, $i + str-length($separator)), $separator)
        );
    }
    @return $string
}

@function nth-last($list) {
    @return nth($list, length($list));
}

@function get-last-selector($selector) {
    @return nth-last(str-split(#{$selector}));
}