_get-breakpoint-directions.scss

/*
  @function get-breakpoint-directions

  Sorts through breakpoints SASS map,
  generates a full SASS map containing all the breakpoint
  variations we'll require

*/
@function get-breakpoint-directions($bps) {
  $_bps: ();
  @each $k, $bp in $bps {
    $_bps: map-merge($_bps, ($k: $bp));
    $start: map-get($bp, start);
    $end: map-get($bp, end);

    @if $end != null and $start != null {
      $down-key: unquote($k + '-');
      $_bps: map-merge($_bps, ($down-key: (
        start: null,
        end: $end
      )));
    }

    @if $start != null and $end != null {
      $up-key: unquote($k) + '+';
      $_bps: map-merge($_bps, ($up-key: (
        start: $start,
        end: null
      )));
    }
  }

  @return $_bps;
}