@function get-name($module, $property) {
  @return --#{$var-prefix}-#{$module}_#{$property}
}

@function get-property($module, $property) {
  $name: get-name($module, $property);
  $state-parts: split-string($module, $state-separator);
  @if length($state-parts) >= 2 {
    $fallback-module: join-to-string(set-nth($state-parts, -1, null), $state-separator);
    @return var($name, get-property($fallback-module, $property))
  } @else {
    @return var($name);
  }
}

@function nth-or-default($list, $n, $default: null) {
  @if length($list) >= $n {
    @return nth($list, $n);
  }

  @return $default;
}

@function split-string($string, $separator, $list: ()) {
  $index: str-index($string, $separator);
  @if $index == null {
    @return append($list, $string);
  }

  $start: str-slice($string, 1, $index - 1);
  $end: str-slice($string, $index + 1, -1);
  $list: append($list, $start);

  @return split-string($end, $separator, $list);
}

@function join-to-string($list, $separator) {
  $result: "";
  @each $item in $list {
    @if type-of($item) == "string" {
      $result: $result + $item + $separator;
    }
  }

  @return str-slice($result, 1, -1 - str-length($separator));
}

@function negative($value) {
  @return calc(#{$value} * -1);
}

@function inset-border($width, $color, $side) {
  $offsets: (
    top: 0 $width,
    right: negative($width) 0,
    bottom: 0 negative($width),
    left: $width 0
  );

  @return inset map-get($offsets, $side) 0 0 $color;
}

@function flag-attr($flag) {
  @return 'data-is-' + $flag
}